2017-11-06 17:11:51 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2005-04-16 22:20:36 +00:00
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/*
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* Serial driver for the amiga builtin port.
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*
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* This code was created by taking serial.c version 4.30 from kernel
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* release 2.3.22, replacing all hardware related stuff with the
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* corresponding amiga hardware actions, and removing all irrelevant
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* code. As a consequence, it uses many of the constants and names
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* associated with the registers and bits of 16550 compatible UARTS -
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* but only to keep track of status, etc in the state variables. It
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* was done this was to make it easier to keep the code in line with
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* (non hardware specific) changes to serial.c.
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*
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* The port is registered with the tty driver as minor device 64, and
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2022-07-15 05:44:01 +00:00
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* therefore other ports should only use 65 upwards.
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2005-04-16 22:20:36 +00:00
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*
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* Richard Lucock 28/12/99
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
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* 1998, 1999 Theodore Ts'o
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*
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*/
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/* Set of debugging defines */
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#undef SERIAL_DEBUG_INTR
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#undef SERIAL_DEBUG_OPEN
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#undef SERIAL_DEBUG_FLOW
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#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
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/*
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* End of serial driver configuration section.
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*/
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2021-07-14 09:13:12 +00:00
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#include <linux/bitops.h>
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2012-03-05 13:52:45 +00:00
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#include <linux/circ_buf.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/console.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/delay.h>
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#include <linux/errno.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/fcntl.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/init.h>
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#include <linux/interrupt.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/ioport.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/kernel.h>
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#include <linux/major.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/mm.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/ptrace.h>
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2009-03-31 22:19:23 +00:00
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#include <linux/seq_file.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/serial.h>
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#include <linux/serial_reg.h>
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2022-06-24 20:54:23 +00:00
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#include <linux/serial_core.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/sched.h>
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#include <linux/signal.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/slab.h>
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2021-07-14 09:13:12 +00:00
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/tty_flip.h>
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#include <linux/tty.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/amigahw.h>
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#include <asm/amigaints.h>
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2021-07-14 09:13:12 +00:00
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#include <asm/irq.h>
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#include <asm/setup.h>
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2005-04-16 22:20:36 +00:00
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2012-03-05 13:52:45 +00:00
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struct serial_state {
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struct tty_port tport;
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struct circ_buf xmit;
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struct async_icount icount;
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unsigned long port;
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int baud_base;
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int custom_divisor;
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int read_status_mask;
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int ignore_status_mask;
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int timeout;
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int quot;
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int IER; /* Interrupt Enable Register */
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int MCR; /* Modem control register */
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int x_char; /* xon/xoff character */
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};
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2005-04-16 22:20:36 +00:00
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static struct tty_driver *serial_driver;
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/* number of characters left in xmit buffer before we ask for more */
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#define WAKEUP_CHARS 256
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2021-07-14 09:13:07 +00:00
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#define XMIT_FIFO_SIZE 1
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2005-04-16 22:20:36 +00:00
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static unsigned char current_ctl_bits;
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2012-03-05 13:52:22 +00:00
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static void change_speed(struct tty_struct *tty, struct serial_state *info,
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2022-08-16 11:57:39 +00:00
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const struct ktermios *old);
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2005-04-16 22:20:36 +00:00
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static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
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2021-07-14 09:13:13 +00:00
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static struct serial_state serial_state;
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2005-04-16 22:20:36 +00:00
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/* some serial hardware definitions */
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#define SDR_OVRUN (1<<15)
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#define SDR_RBF (1<<14)
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#define SDR_TBE (1<<13)
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#define SDR_TSRE (1<<12)
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#define SERPER_PARENB (1<<15)
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#define AC_SETCLR (1<<15)
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#define AC_UARTBRK (1<<11)
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#define SER_DTR (1<<7)
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#define SER_RTS (1<<6)
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#define SER_DCD (1<<5)
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#define SER_CTS (1<<4)
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#define SER_DSR (1<<3)
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static __inline__ void rtsdtr_ctrl(int bits)
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{
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ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
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}
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/*
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* ------------------------------------------------------------
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* rs_stop() and rs_start()
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*
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2021-05-05 09:19:05 +00:00
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* This routines are called before setting or resetting tty->flow.stopped.
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2005-04-16 22:20:36 +00:00
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* They enable or disable transmitter interrupts, as necessary.
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* ------------------------------------------------------------
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*/
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static void rs_stop(struct tty_struct *tty)
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{
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2012-03-05 13:52:20 +00:00
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struct serial_state *info = tty->driver_data;
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2005-04-16 22:20:36 +00:00
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unsigned long flags;
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local_irq_save(flags);
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if (info->IER & UART_IER_THRI) {
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info->IER &= ~UART_IER_THRI;
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/* disable Tx interrupt and remove any pending interrupts */
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2021-07-14 09:13:11 +00:00
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amiga_custom.intena = IF_TBE;
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2005-04-16 22:20:36 +00:00
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mb();
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2021-07-14 09:13:11 +00:00
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amiga_custom.intreq = IF_TBE;
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2005-04-16 22:20:36 +00:00
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mb();
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}
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local_irq_restore(flags);
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}
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static void rs_start(struct tty_struct *tty)
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{
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2012-03-05 13:52:20 +00:00
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struct serial_state *info = tty->driver_data;
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2005-04-16 22:20:36 +00:00
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unsigned long flags;
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local_irq_save(flags);
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if (info->xmit.head != info->xmit.tail
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&& info->xmit.buf
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&& !(info->IER & UART_IER_THRI)) {
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info->IER |= UART_IER_THRI;
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2021-07-14 09:13:11 +00:00
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amiga_custom.intena = IF_SETCLR | IF_TBE;
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2005-04-16 22:20:36 +00:00
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mb();
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/* set a pending Tx Interrupt, transmitter should restart now */
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2021-07-14 09:13:11 +00:00
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amiga_custom.intreq = IF_SETCLR | IF_TBE;
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2005-04-16 22:20:36 +00:00
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mb();
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}
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local_irq_restore(flags);
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}
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/*
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* ----------------------------------------------------------------------
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*
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2021-07-14 09:13:06 +00:00
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* Here start the interrupt handling routines.
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2005-04-16 22:20:36 +00:00
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*
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* -----------------------------------------------------------------------
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*/
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2012-03-05 13:52:20 +00:00
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static void receive_chars(struct serial_state *info)
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2005-04-16 22:20:36 +00:00
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{
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int status;
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int serdatr;
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
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unsigned char ch, flag;
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2005-04-16 22:20:36 +00:00
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struct async_icount *icount;
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
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int oe = 0;
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2005-04-16 22:20:36 +00:00
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2012-03-05 13:52:20 +00:00
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icount = &info->icount;
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2005-04-16 22:20:36 +00:00
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status = UART_LSR_DR; /* We obviously have a character! */
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2021-07-14 09:13:11 +00:00
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serdatr = amiga_custom.serdatr;
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2005-04-16 22:20:36 +00:00
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mb();
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2021-07-14 09:13:11 +00:00
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amiga_custom.intreq = IF_RBF;
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2005-04-16 22:20:36 +00:00
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mb();
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if((serdatr & 0x1ff) == 0)
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status |= UART_LSR_BI;
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if(serdatr & SDR_OVRUN)
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status |= UART_LSR_OE;
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ch = serdatr & 0xff;
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icount->rx++;
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#ifdef SERIAL_DEBUG_INTR
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printk("DR%02x:%02x...", ch, status);
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#endif
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
flag = TTY_NORMAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* We don't handle parity or frame errors - but I have left
|
|
|
|
* the code in, since I'm not sure that the errors can't be
|
|
|
|
* detected.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (status & (UART_LSR_BI | UART_LSR_PE |
|
|
|
|
UART_LSR_FE | UART_LSR_OE)) {
|
|
|
|
/*
|
|
|
|
* For statistics only
|
|
|
|
*/
|
|
|
|
if (status & UART_LSR_BI) {
|
|
|
|
status &= ~(UART_LSR_FE | UART_LSR_PE);
|
|
|
|
icount->brk++;
|
|
|
|
} else if (status & UART_LSR_PE)
|
|
|
|
icount->parity++;
|
|
|
|
else if (status & UART_LSR_FE)
|
|
|
|
icount->frame++;
|
|
|
|
if (status & UART_LSR_OE)
|
|
|
|
icount->overrun++;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now check to see if character should be
|
|
|
|
* ignored, and mask off conditions which
|
|
|
|
* should be ignored.
|
|
|
|
*/
|
|
|
|
if (status & info->ignore_status_mask)
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
status &= info->read_status_mask;
|
|
|
|
|
|
|
|
if (status & (UART_LSR_BI)) {
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("handling break....");
|
|
|
|
#endif
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
flag = TTY_BREAK;
|
2012-03-05 13:52:27 +00:00
|
|
|
if (info->tport.flags & ASYNC_SAK)
|
2013-01-03 14:53:06 +00:00
|
|
|
do_SAK(info->tport.tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
} else if (status & UART_LSR_PE)
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
flag = TTY_PARITY;
|
2005-04-16 22:20:36 +00:00
|
|
|
else if (status & UART_LSR_FE)
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
flag = TTY_FRAME;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (status & UART_LSR_OE) {
|
|
|
|
/*
|
|
|
|
* Overrun is special, since it's
|
|
|
|
* reported immediately, and doesn't
|
|
|
|
* affect the current character
|
|
|
|
*/
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
oe = 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
2013-01-03 14:53:03 +00:00
|
|
|
tty_insert_flip_char(&info->tport, ch, flag);
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
if (oe == 1)
|
2013-01-03 14:53:03 +00:00
|
|
|
tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
|
2013-01-03 14:53:06 +00:00
|
|
|
tty_flip_buffer_push(&info->tport);
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
|
|
|
out:
|
|
|
|
return;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2012-03-05 13:52:20 +00:00
|
|
|
static void transmit_chars(struct serial_state *info)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
if (info->x_char) {
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.serdat = info->x_char | 0x100;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
2012-03-05 13:52:20 +00:00
|
|
|
info->icount.tx++;
|
2005-04-16 22:20:36 +00:00
|
|
|
info->x_char = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (info->xmit.head == info->xmit.tail
|
2021-05-05 09:19:05 +00:00
|
|
|
|| info->tport.tty->flow.stopped
|
2012-03-05 13:52:24 +00:00
|
|
|
|| info->tport.tty->hw_stopped) {
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER &= ~UART_IER_THRI;
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
2022-06-24 20:54:23 +00:00
|
|
|
info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
|
2012-03-05 13:52:20 +00:00
|
|
|
info->icount.tx++;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (CIRC_CNT(info->xmit.head,
|
|
|
|
info->xmit.tail,
|
2022-06-24 20:54:23 +00:00
|
|
|
UART_XMIT_SIZE) < WAKEUP_CHARS)
|
2012-03-05 13:52:24 +00:00
|
|
|
tty_wakeup(info->tport.tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("THRE...");
|
|
|
|
#endif
|
|
|
|
if (info->xmit.head == info->xmit.tail) {
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
info->IER &= ~UART_IER_THRI;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-03-05 13:52:20 +00:00
|
|
|
static void check_modem_status(struct serial_state *info)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:43 +00:00
|
|
|
struct tty_port *port = &info->tport;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
|
|
|
|
unsigned char dstatus;
|
|
|
|
struct async_icount *icount;
|
|
|
|
|
|
|
|
/* Determine bits that have changed */
|
|
|
|
dstatus = status ^ current_ctl_bits;
|
|
|
|
current_ctl_bits = status;
|
|
|
|
|
|
|
|
if (dstatus) {
|
2012-03-05 13:52:20 +00:00
|
|
|
icount = &info->icount;
|
2005-04-16 22:20:36 +00:00
|
|
|
/* update input line counters */
|
|
|
|
if (dstatus & SER_DSR)
|
|
|
|
icount->dsr++;
|
|
|
|
if (dstatus & SER_DCD) {
|
|
|
|
icount->dcd++;
|
|
|
|
}
|
|
|
|
if (dstatus & SER_CTS)
|
|
|
|
icount->cts++;
|
2012-03-05 13:52:43 +00:00
|
|
|
wake_up_interruptible(&port->delta_msr_wait);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2016-04-10 00:53:23 +00:00
|
|
|
if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
|
|
|
|
printk("ttyS%d CD now %s...", info->line,
|
|
|
|
(!(status & SER_DCD)) ? "on" : "off");
|
|
|
|
#endif
|
|
|
|
if (!(status & SER_DCD))
|
2012-03-05 13:52:43 +00:00
|
|
|
wake_up_interruptible(&port->open_wait);
|
2005-04-16 22:20:36 +00:00
|
|
|
else {
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("doing serial hangup...");
|
|
|
|
#endif
|
2012-03-05 13:52:43 +00:00
|
|
|
if (port->tty)
|
|
|
|
tty_hangup(port->tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
2012-08-23 02:13:36 +00:00
|
|
|
if (tty_port_cts_enabled(port)) {
|
2012-03-05 13:52:43 +00:00
|
|
|
if (port->tty->hw_stopped) {
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!(status & SER_CTS)) {
|
|
|
|
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
|
|
|
|
printk("CTS tx start...");
|
|
|
|
#endif
|
2023-03-09 08:20:35 +00:00
|
|
|
port->tty->hw_stopped = false;
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER |= UART_IER_THRI;
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
2012-03-05 13:52:43 +00:00
|
|
|
tty_wakeup(port->tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if ((status & SER_CTS)) {
|
|
|
|
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
|
|
|
|
printk("CTS tx stop...");
|
|
|
|
#endif
|
2023-03-09 08:20:35 +00:00
|
|
|
port->tty->hw_stopped = true;
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER &= ~UART_IER_THRI;
|
|
|
|
/* disable Tx interrupt and remove any pending interrupts */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
|
|
|
static irqreturn_t ser_vbl_int( int irq, void *data)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
/* vbl is just a periodic interrupt we tie into to update modem status */
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = data;
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* TBD - is it better to unregister from this interrupt or to
|
|
|
|
* ignore it if MSI is clear ?
|
|
|
|
*/
|
|
|
|
if(info->IER & UART_IER_MSI)
|
|
|
|
check_modem_status(info);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
|
|
|
static irqreturn_t ser_rx_int(int irq, void *dev_id)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = dev_id;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("ser_rx_int...");
|
|
|
|
#endif
|
|
|
|
|
2012-03-05 13:52:24 +00:00
|
|
|
if (!info->tport.tty)
|
2005-04-16 22:20:36 +00:00
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
receive_chars(info);
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("end.\n");
|
|
|
|
#endif
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
|
|
|
static irqreturn_t ser_tx_int(int irq, void *dev_id)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = dev_id;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
if (amiga_custom.serdatr & SDR_TBE) {
|
2005-04-16 22:20:36 +00:00
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("ser_tx_int...");
|
|
|
|
#endif
|
|
|
|
|
2012-03-05 13:52:24 +00:00
|
|
|
if (!info->tport.tty)
|
2005-04-16 22:20:36 +00:00
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
transmit_chars(info);
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
|
|
printk("end.\n");
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* -------------------------------------------------------------------
|
|
|
|
* Here ends the serial interrupt routines.
|
|
|
|
* -------------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ---------------------------------------------------------------
|
|
|
|
* Low level utility subroutines for the serial driver: routines to
|
|
|
|
* figure out the appropriate timeout for an interrupt chain, routines
|
|
|
|
* to initialize and startup a serial port, and routines to shutdown a
|
|
|
|
* serial port. Useful stuff like that.
|
|
|
|
* ---------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
2012-03-05 13:52:22 +00:00
|
|
|
static int startup(struct tty_struct *tty, struct serial_state *info)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:27 +00:00
|
|
|
struct tty_port *port = &info->tport;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
int retval=0;
|
|
|
|
unsigned long page;
|
|
|
|
|
|
|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
2016-04-10 00:53:25 +00:00
|
|
|
if (tty_port_initialized(port)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
free_page(page);
|
|
|
|
goto errout;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->xmit.buf)
|
|
|
|
free_page(page);
|
|
|
|
else
|
|
|
|
info->xmit.buf = (unsigned char *) page;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("starting up ttys%d ...", info->line);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Clear anything in the input buffer */
|
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_RBF;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
|
|
|
retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
|
|
|
|
if (retval) {
|
2021-07-14 09:13:10 +00:00
|
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
|
|
retval = 0;
|
|
|
|
}
|
|
|
|
goto errout;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* enable both Rx and Tx interrupts */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
info->IER = UART_IER_MSI;
|
|
|
|
|
|
|
|
/* remember current state of the DCD and CTS bits */
|
|
|
|
current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
|
|
|
|
|
|
|
|
info->MCR = 0;
|
2012-03-05 13:52:22 +00:00
|
|
|
if (C_BAUD(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR = SER_DTR | SER_RTS;
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
|
2012-03-05 13:52:22 +00:00
|
|
|
clear_bit(TTY_IO_ERROR, &tty->flags);
|
2005-04-16 22:20:36 +00:00
|
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* and set the speed of the serial port
|
|
|
|
*/
|
2012-03-05 13:52:22 +00:00
|
|
|
change_speed(tty, info, NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2023-01-17 09:03:47 +00:00
|
|
|
tty_port_set_initialized(port, true);
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
errout:
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
|
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
|
|
|
*/
|
2012-03-05 13:52:22 +00:00
|
|
|
static void shutdown(struct tty_struct *tty, struct serial_state *info)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
2016-04-10 00:53:25 +00:00
|
|
|
if (!tty_port_initialized(&info->tport))
|
2005-04-16 22:20:36 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("Shutting down serial port %d ....\n", info->line);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
local_irq_save(flags); /* Disable interrupts */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
|
|
|
|
* here so the queue might never be waken up
|
|
|
|
*/
|
2012-03-05 13:52:24 +00:00
|
|
|
wake_up_interruptible(&info->tport.delta_msr_wait);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Free the IRQ, if necessary
|
|
|
|
*/
|
|
|
|
free_irq(IRQ_AMIGA_VERTB, info);
|
|
|
|
|
2022-02-02 16:56:55 +00:00
|
|
|
free_page((unsigned long)info->xmit.buf);
|
|
|
|
info->xmit.buf = NULL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
info->IER = 0;
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_RBF | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
|
|
|
/* disable break condition */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.adkcon = AC_UARTBRK;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
2016-01-11 04:36:15 +00:00
|
|
|
if (C_HUPCL(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
|
2012-03-05 13:52:22 +00:00
|
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2023-01-17 09:03:47 +00:00
|
|
|
tty_port_set_initialized(&info->tport, false);
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is called to set the UART divisor registers to match
|
|
|
|
* the specified baud rate for a serial port.
|
|
|
|
*/
|
2012-03-05 13:52:22 +00:00
|
|
|
static void change_speed(struct tty_struct *tty, struct serial_state *info,
|
2022-08-16 11:57:39 +00:00
|
|
|
const struct ktermios *old_termios)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:27 +00:00
|
|
|
struct tty_port *port = &info->tport;
|
2005-04-16 22:20:36 +00:00
|
|
|
int quot = 0, baud_base, baud;
|
|
|
|
unsigned cflag, cval = 0;
|
|
|
|
int bits;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2012-07-14 14:31:47 +00:00
|
|
|
cflag = tty->termios.c_cflag;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Byte size is always 8 bits plus parity bit if requested */
|
|
|
|
|
|
|
|
cval = 3; bits = 10;
|
|
|
|
if (cflag & CSTOPB) {
|
|
|
|
cval |= 0x04;
|
|
|
|
bits++;
|
|
|
|
}
|
|
|
|
if (cflag & PARENB) {
|
|
|
|
cval |= UART_LCR_PARITY;
|
|
|
|
bits++;
|
|
|
|
}
|
|
|
|
if (!(cflag & PARODD))
|
|
|
|
cval |= UART_LCR_EPAR;
|
|
|
|
if (cflag & CMSPAR)
|
|
|
|
cval |= UART_LCR_SPAR;
|
|
|
|
|
|
|
|
/* Determine divisor based on baud rate */
|
2012-03-05 13:52:22 +00:00
|
|
|
baud = tty_get_baud_rate(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!baud)
|
|
|
|
baud = 9600; /* B0 transition handled in rs_set_termios */
|
2012-03-05 13:52:20 +00:00
|
|
|
baud_base = info->baud_base;
|
2012-03-05 13:52:27 +00:00
|
|
|
if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
|
2012-03-05 13:52:20 +00:00
|
|
|
quot = info->custom_divisor;
|
2005-04-16 22:20:36 +00:00
|
|
|
else {
|
|
|
|
if (baud == 134)
|
|
|
|
/* Special case since 134 is really 134.5 */
|
|
|
|
quot = (2*baud_base / 269);
|
|
|
|
else if (baud)
|
|
|
|
quot = baud_base / baud;
|
|
|
|
}
|
|
|
|
/* If the quotient is zero refuse the change */
|
|
|
|
if (!quot && old_termios) {
|
2007-07-16 06:41:47 +00:00
|
|
|
/* FIXME: Will need updating for new tty in the end */
|
2012-07-14 14:31:47 +00:00
|
|
|
tty->termios.c_cflag &= ~CBAUD;
|
|
|
|
tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
|
2012-03-05 13:52:22 +00:00
|
|
|
baud = tty_get_baud_rate(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!baud)
|
|
|
|
baud = 9600;
|
|
|
|
if (baud == 38400 &&
|
2012-03-05 13:52:27 +00:00
|
|
|
(port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
|
2012-03-05 13:52:20 +00:00
|
|
|
quot = info->custom_divisor;
|
2005-04-16 22:20:36 +00:00
|
|
|
else {
|
|
|
|
if (baud == 134)
|
|
|
|
/* Special case since 134 is really 134.5 */
|
|
|
|
quot = (2*baud_base / 269);
|
|
|
|
else if (baud)
|
|
|
|
quot = baud_base / baud;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* As a last resort, if the quotient is zero, default to 9600 bps */
|
|
|
|
if (!quot)
|
|
|
|
quot = baud_base / 9600;
|
|
|
|
info->quot = quot;
|
2021-07-14 09:13:07 +00:00
|
|
|
info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
|
2005-04-16 22:20:36 +00:00
|
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
|
|
|
|
|
|
|
/* CTS flow control flag and modem status interrupts */
|
|
|
|
info->IER &= ~UART_IER_MSI;
|
2012-03-05 13:52:27 +00:00
|
|
|
if (port->flags & ASYNC_HARDPPS_CD)
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER |= UART_IER_MSI;
|
2016-04-10 00:53:21 +00:00
|
|
|
tty_port_set_cts_flow(port, cflag & CRTSCTS);
|
|
|
|
if (cflag & CRTSCTS)
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER |= UART_IER_MSI;
|
2016-04-10 00:53:23 +00:00
|
|
|
tty_port_set_check_carrier(port, ~cflag & CLOCAL);
|
|
|
|
if (~cflag & CLOCAL)
|
2005-04-16 22:20:36 +00:00
|
|
|
info->IER |= UART_IER_MSI;
|
|
|
|
/* TBD:
|
2009-04-15 02:14:10 +00:00
|
|
|
* Does clearing IER_MSI imply that we should disable the VBL interrupt ?
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set up parity check flag
|
|
|
|
*/
|
|
|
|
|
|
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
|
2012-03-05 13:52:22 +00:00
|
|
|
if (I_INPCK(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
2012-03-05 13:52:22 +00:00
|
|
|
if (I_BRKINT(tty) || I_PARMRK(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Characters to ignore
|
|
|
|
*/
|
|
|
|
info->ignore_status_mask = 0;
|
2012-03-05 13:52:22 +00:00
|
|
|
if (I_IGNPAR(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
2012-03-05 13:52:22 +00:00
|
|
|
if (I_IGNBRK(tty)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
|
|
|
/*
|
|
|
|
* If we're ignore parity and break indicators, ignore
|
|
|
|
* overruns too. (For real raw support).
|
|
|
|
*/
|
2012-03-05 13:52:22 +00:00
|
|
|
if (I_IGNPAR(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->ignore_status_mask |= UART_LSR_OE;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* !!! ignore all characters if CREAD is not set
|
|
|
|
*/
|
|
|
|
if ((cflag & CREAD) == 0)
|
|
|
|
info->ignore_status_mask |= UART_LSR_DR;
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
{
|
|
|
|
short serper;
|
|
|
|
|
|
|
|
/* Set up the baud rate */
|
|
|
|
serper = quot - 1;
|
|
|
|
|
|
|
|
/* Enable or disable parity bit */
|
|
|
|
|
|
|
|
if(cval & UART_LCR_PARITY)
|
|
|
|
serper |= (SERPER_PARENB);
|
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.serper = serper;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
}
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
2008-04-30 07:54:02 +00:00
|
|
|
static int rs_put_char(struct tty_struct *tty, unsigned char ch)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
2005-06-23 07:10:08 +00:00
|
|
|
info = tty->driver_data;
|
|
|
|
|
|
|
|
if (!info->xmit.buf)
|
2008-04-30 07:54:02 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (CIRC_SPACE(info->xmit.head,
|
|
|
|
info->xmit.tail,
|
2022-06-24 20:54:23 +00:00
|
|
|
UART_XMIT_SIZE) == 0) {
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
2008-04-30 07:54:02 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
info->xmit.buf[info->xmit.head++] = ch;
|
2022-06-24 20:54:23 +00:00
|
|
|
info->xmit.head &= UART_XMIT_SIZE - 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
2008-04-30 07:54:02 +00:00
|
|
|
return 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (info->xmit.head == info->xmit.tail
|
2021-05-05 09:19:05 +00:00
|
|
|
|| tty->flow.stopped
|
2005-04-16 22:20:36 +00:00
|
|
|
|| tty->hw_stopped
|
|
|
|
|| !info->xmit.buf)
|
|
|
|
return;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
info->IER |= UART_IER_THRI;
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
|
|
|
|
{
|
|
|
|
int c, ret = 0;
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
2006-10-04 09:15:27 +00:00
|
|
|
if (!info->xmit.buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
2007-02-10 09:46:48 +00:00
|
|
|
local_irq_save(flags);
|
2005-04-16 22:20:36 +00:00
|
|
|
while (1) {
|
|
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
|
|
|
info->xmit.tail,
|
2022-06-24 20:54:23 +00:00
|
|
|
UART_XMIT_SIZE);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (count < c)
|
|
|
|
c = count;
|
|
|
|
if (c <= 0) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
memcpy(info->xmit.buf + info->xmit.head, buf, c);
|
2022-06-24 20:54:23 +00:00
|
|
|
info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
|
2005-04-16 22:20:36 +00:00
|
|
|
buf += c;
|
|
|
|
count -= c;
|
|
|
|
ret += c;
|
|
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
if (info->xmit.head != info->xmit.tail
|
2021-05-05 09:19:05 +00:00
|
|
|
&& !tty->flow.stopped
|
2005-04-16 22:20:36 +00:00
|
|
|
&& !tty->hw_stopped
|
|
|
|
&& !(info->IER & UART_IER_THRI)) {
|
|
|
|
info->IER |= UART_IER_THRI;
|
|
|
|
local_irq_disable();
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-05-05 09:19:15 +00:00
|
|
|
static unsigned int rs_write_room(struct tty_struct *tty)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2022-06-24 20:54:23 +00:00
|
|
|
return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2021-05-05 09:19:19 +00:00
|
|
|
static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2022-06-24 20:54:23 +00:00
|
|
|
return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
tty_wakeup(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This function is used to send a high-priority XON/XOFF character to
|
|
|
|
* the device
|
|
|
|
*/
|
|
|
|
static void rs_send_xchar(struct tty_struct *tty, char ch)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
info->x_char = ch;
|
|
|
|
if (ch) {
|
|
|
|
/* Make sure transmit interrupts are on */
|
|
|
|
|
|
|
|
/* Check this ! */
|
|
|
|
local_irq_save(flags);
|
2021-07-14 09:13:11 +00:00
|
|
|
if(!(amiga_custom.intenar & IF_TBE)) {
|
|
|
|
amiga_custom.intena = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_SETCLR | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
info->IER |= UART_IER_THRI;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
* rs_throttle()
|
|
|
|
*
|
|
|
|
* This routine is called by the upper-layer tty layer to signal that
|
|
|
|
* incoming characters should be throttled.
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
static void rs_throttle(struct tty_struct * tty)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
2016-01-11 06:40:54 +00:00
|
|
|
printk("throttle %s ....\n", tty_name(tty));
|
2005-04-16 22:20:36 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
if (I_IXOFF(tty))
|
|
|
|
rs_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
|
2016-01-11 04:36:15 +00:00
|
|
|
if (C_CRTSCTS(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR &= ~SER_RTS;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
2016-01-11 06:40:54 +00:00
|
|
|
printk("unthrottle %s ....\n", tty_name(tty));
|
2005-04-16 22:20:36 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
if (I_IXOFF(tty)) {
|
|
|
|
if (info->x_char)
|
|
|
|
info->x_char = 0;
|
|
|
|
else
|
|
|
|
rs_send_xchar(tty, START_CHAR(tty));
|
|
|
|
}
|
2016-01-11 04:36:15 +00:00
|
|
|
if (C_CRTSCTS(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR |= SER_RTS;
|
|
|
|
local_irq_save(flags);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
* rs_ioctl() and friends
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
2018-09-12 01:59:13 +00:00
|
|
|
static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2018-09-12 01:59:13 +00:00
|
|
|
struct serial_state *state = tty->driver_data;
|
2021-04-07 10:23:27 +00:00
|
|
|
unsigned int close_delay, closing_wait;
|
2018-09-12 01:59:13 +00:00
|
|
|
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_lock(tty);
|
2021-04-07 10:23:27 +00:00
|
|
|
close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
|
|
|
|
closing_wait = state->tport.closing_wait;
|
|
|
|
if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
|
|
closing_wait = jiffies_to_msecs(closing_wait) / 10;
|
|
|
|
|
2018-09-12 01:59:13 +00:00
|
|
|
ss->line = tty->index;
|
|
|
|
ss->port = state->port;
|
|
|
|
ss->flags = state->tport.flags;
|
2021-07-14 09:13:07 +00:00
|
|
|
ss->xmit_fifo_size = XMIT_FIFO_SIZE;
|
2018-09-12 01:59:13 +00:00
|
|
|
ss->baud_base = state->baud_base;
|
2021-04-07 10:23:27 +00:00
|
|
|
ss->close_delay = close_delay;
|
|
|
|
ss->closing_wait = closing_wait;
|
2018-09-12 01:59:13 +00:00
|
|
|
ss->custom_divisor = state->custom_divisor;
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_unlock(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-09-12 01:59:13 +00:00
|
|
|
static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2018-09-12 01:59:13 +00:00
|
|
|
struct serial_state *state = tty->driver_data;
|
2012-03-05 13:52:27 +00:00
|
|
|
struct tty_port *port = &state->tport;
|
2012-03-05 13:52:21 +00:00
|
|
|
bool change_spd;
|
2005-04-16 22:20:36 +00:00
|
|
|
int retval = 0;
|
2021-04-07 10:23:27 +00:00
|
|
|
unsigned int close_delay, closing_wait;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_lock(tty);
|
2018-09-12 01:59:13 +00:00
|
|
|
change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
|
|
|
|
ss->custom_divisor != state->custom_divisor;
|
|
|
|
if (ss->irq || ss->port != state->port ||
|
2021-07-14 09:13:07 +00:00
|
|
|
ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_unlock(tty);
|
2012-03-05 13:52:21 +00:00
|
|
|
return -EINVAL;
|
2008-04-30 07:53:16 +00:00
|
|
|
}
|
2021-04-07 10:23:27 +00:00
|
|
|
|
|
|
|
close_delay = msecs_to_jiffies(ss->close_delay * 10);
|
|
|
|
closing_wait = ss->closing_wait;
|
|
|
|
if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
|
|
closing_wait = msecs_to_jiffies(closing_wait * 10);
|
|
|
|
|
2021-07-14 09:13:10 +00:00
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
2018-09-12 01:59:13 +00:00
|
|
|
if ((ss->baud_base != state->baud_base) ||
|
2021-04-07 10:23:27 +00:00
|
|
|
(close_delay != port->close_delay) ||
|
|
|
|
(closing_wait != port->closing_wait) ||
|
2018-09-12 01:59:13 +00:00
|
|
|
((ss->flags & ~ASYNC_USR_MASK) !=
|
2012-04-19 16:12:40 +00:00
|
|
|
(port->flags & ~ASYNC_USR_MASK))) {
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_unlock(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EPERM;
|
2012-04-19 16:12:40 +00:00
|
|
|
}
|
2012-03-05 13:52:27 +00:00
|
|
|
port->flags = ((port->flags & ~ASYNC_USR_MASK) |
|
2018-09-12 01:59:13 +00:00
|
|
|
(ss->flags & ASYNC_USR_MASK));
|
|
|
|
state->custom_divisor = ss->custom_divisor;
|
2005-04-16 22:20:36 +00:00
|
|
|
goto check_and_exit;
|
|
|
|
}
|
|
|
|
|
2018-09-12 01:59:13 +00:00
|
|
|
if (ss->baud_base < 9600) {
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_unlock(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EINVAL;
|
2008-04-30 07:53:16 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* OK, past this point, all the error checking has been done.
|
|
|
|
* At this point, we start making changes.....
|
|
|
|
*/
|
|
|
|
|
2018-09-12 01:59:13 +00:00
|
|
|
state->baud_base = ss->baud_base;
|
2012-03-05 13:52:27 +00:00
|
|
|
port->flags = ((port->flags & ~ASYNC_FLAGS) |
|
2018-09-12 01:59:13 +00:00
|
|
|
(ss->flags & ASYNC_FLAGS));
|
|
|
|
state->custom_divisor = ss->custom_divisor;
|
2021-04-07 10:23:27 +00:00
|
|
|
port->close_delay = close_delay;
|
|
|
|
port->closing_wait = closing_wait;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
check_and_exit:
|
2016-04-10 00:53:25 +00:00
|
|
|
if (tty_port_initialized(port)) {
|
2012-03-05 13:52:21 +00:00
|
|
|
if (change_spd) {
|
2017-06-06 10:54:37 +00:00
|
|
|
/* warn about deprecation unless clearing */
|
2018-09-12 01:59:13 +00:00
|
|
|
if (ss->flags & ASYNC_SPD_MASK)
|
2017-06-06 10:54:37 +00:00
|
|
|
dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
|
2012-03-05 13:52:22 +00:00
|
|
|
change_speed(tty, state, NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
} else
|
2012-03-05 13:52:22 +00:00
|
|
|
retval = startup(tty, state);
|
2012-08-08 15:30:13 +00:00
|
|
|
tty_unlock(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* get_lsr_info - get line status register info
|
|
|
|
*
|
|
|
|
* Purpose: Let user call ioctl() to get info when the UART physically
|
|
|
|
* is emptied. On bus types like RS485, the transmitter must
|
|
|
|
* release the bus after transmitting. This must be done when
|
|
|
|
* the transmit shift register is empty, not be done when the
|
|
|
|
* transmit holding register is empty. This functionality
|
|
|
|
* allows an RS485 driver to be written in user space.
|
|
|
|
*/
|
2012-03-05 13:52:20 +00:00
|
|
|
static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
unsigned char status;
|
|
|
|
unsigned int result;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
2021-07-14 09:13:11 +00:00
|
|
|
status = amiga_custom.serdatr;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
local_irq_restore(flags);
|
|
|
|
result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
|
|
|
|
if (copy_to_user(value, &result, sizeof(int)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2011-02-14 16:26:14 +00:00
|
|
|
static int rs_tiocmget(struct tty_struct *tty)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned char control, status;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2016-04-10 00:06:48 +00:00
|
|
|
if (tty_io_error(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
control = info->MCR;
|
|
|
|
local_irq_save(flags);
|
|
|
|
status = ciab.pra;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return ((control & SER_RTS) ? TIOCM_RTS : 0)
|
|
|
|
| ((control & SER_DTR) ? TIOCM_DTR : 0)
|
|
|
|
| (!(status & SER_DCD) ? TIOCM_CAR : 0)
|
|
|
|
| (!(status & SER_DSR) ? TIOCM_DSR : 0)
|
|
|
|
| (!(status & SER_CTS) ? TIOCM_CTS : 0);
|
|
|
|
}
|
|
|
|
|
2011-02-14 16:26:50 +00:00
|
|
|
static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
|
|
|
|
unsigned int clear)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
2016-04-10 00:06:48 +00:00
|
|
|
if (tty_io_error(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (set & TIOCM_RTS)
|
|
|
|
info->MCR |= SER_RTS;
|
|
|
|
if (set & TIOCM_DTR)
|
|
|
|
info->MCR |= SER_DTR;
|
|
|
|
if (clear & TIOCM_RTS)
|
|
|
|
info->MCR &= ~SER_RTS;
|
|
|
|
if (clear & TIOCM_DTR)
|
|
|
|
info->MCR &= ~SER_DTR;
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* rs_break() --- routine which turns the break handling on or off
|
|
|
|
*/
|
2008-07-22 10:18:03 +00:00
|
|
|
static int rs_break(struct tty_struct *tty, int break_state)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (break_state == -1)
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
|
2005-04-16 22:20:36 +00:00
|
|
|
else
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.adkcon = AC_UARTBRK;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
local_irq_restore(flags);
|
2008-07-22 10:18:03 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2010-09-16 17:21:52 +00:00
|
|
|
/*
|
|
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
|
|
|
* Return: write counters to the user passed counter struct
|
|
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
|
|
|
* RI where only 0->1 is counted.
|
|
|
|
*/
|
|
|
|
static int rs_get_icount(struct tty_struct *tty,
|
|
|
|
struct serial_icounter_struct *icount)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2010-09-16 17:21:52 +00:00
|
|
|
struct async_icount cnow;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
2012-03-05 13:52:20 +00:00
|
|
|
cnow = info->icount;
|
2010-09-16 17:21:52 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
icount->cts = cnow.cts;
|
|
|
|
icount->dsr = cnow.dsr;
|
|
|
|
icount->rng = cnow.rng;
|
|
|
|
icount->dcd = cnow.dcd;
|
|
|
|
icount->rx = cnow.rx;
|
|
|
|
icount->tx = cnow.tx;
|
|
|
|
icount->frame = cnow.frame;
|
|
|
|
icount->overrun = cnow.overrun;
|
|
|
|
icount->parity = cnow.parity;
|
|
|
|
icount->brk = cnow.brk;
|
|
|
|
icount->buf_overrun = cnow.buf_overrun;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-02-14 16:27:22 +00:00
|
|
|
static int rs_ioctl(struct tty_struct *tty,
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct async_icount cprev, cnow; /* kernel counter temps */
|
2006-01-12 09:06:30 +00:00
|
|
|
void __user *argp = (void __user *)arg;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
2014-01-02 12:07:38 +00:00
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
int ret;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2018-09-14 18:46:18 +00:00
|
|
|
if ((cmd != TIOCSERCONFIG) &&
|
2005-04-16 22:20:36 +00:00
|
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
|
2016-04-10 00:06:48 +00:00
|
|
|
if (tty_io_error(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case TIOCSERCONFIG:
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case TIOCSERGETLSR: /* Get line status register */
|
2006-01-12 09:06:30 +00:00
|
|
|
return get_lsr_info(info, argp);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
|
|
|
* - mask passed in arg for lines of interest
|
|
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
|
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
|
|
|
*/
|
|
|
|
case TIOCMIWAIT:
|
|
|
|
local_irq_save(flags);
|
|
|
|
/* note the counters on entry */
|
2012-03-05 13:52:20 +00:00
|
|
|
cprev = info->icount;
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
while (1) {
|
2014-01-02 12:07:38 +00:00
|
|
|
prepare_to_wait(&info->tport.delta_msr_wait,
|
|
|
|
&wait, TASK_INTERRUPTIBLE);
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_save(flags);
|
2012-03-05 13:52:20 +00:00
|
|
|
cnow = info->icount; /* atomic copy */
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
|
2014-01-02 12:07:38 +00:00
|
|
|
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
|
|
|
|
ret = -EIO; /* no change => error */
|
|
|
|
break;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
|
|
|
|
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
|
|
|
|
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
|
|
|
|
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
|
2014-01-02 12:07:38 +00:00
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
schedule();
|
|
|
|
/* see if a signal did it */
|
|
|
|
if (signal_pending(current)) {
|
|
|
|
ret = -ERESTARTSYS;
|
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
cprev = cnow;
|
|
|
|
}
|
2014-01-02 12:07:38 +00:00
|
|
|
finish_wait(&info->tport.delta_msr_wait, &wait);
|
|
|
|
return ret;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
default:
|
|
|
|
return -ENOIOCTLCMD;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2022-08-16 11:57:39 +00:00
|
|
|
static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
2012-07-14 14:31:47 +00:00
|
|
|
unsigned int cflag = tty->termios.c_cflag;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:22 +00:00
|
|
|
change_speed(tty, info, old_termios);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Handle transition to B0 status */
|
2016-01-11 04:36:15 +00:00
|
|
|
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
|
|
local_irq_save(flags);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle transition away from B0 status */
|
2016-01-11 04:36:15 +00:00
|
|
|
if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR |= SER_DTR;
|
2016-04-10 00:11:36 +00:00
|
|
|
if (!C_CRTSCTS(tty) || !tty_throttled(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
info->MCR |= SER_RTS;
|
|
|
|
local_irq_save(flags);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle turning off CRTSCTS */
|
2016-01-11 04:36:15 +00:00
|
|
|
if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
|
2023-03-09 08:20:35 +00:00
|
|
|
tty->hw_stopped = false;
|
2005-04-16 22:20:36 +00:00
|
|
|
rs_start(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
/*
|
|
|
|
* No need to wake up processes in open wait, since they
|
|
|
|
* sample the CLOCAL flag once, and don't recheck it.
|
|
|
|
* XXX It's not clear whether the current behavior is correct
|
|
|
|
* or not. Hence, this may change.....
|
|
|
|
*/
|
2016-01-11 04:36:15 +00:00
|
|
|
if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
|
2005-04-16 22:20:36 +00:00
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
* rs_close()
|
|
|
|
*
|
|
|
|
* This routine is called when the serial port gets closed. First, we
|
|
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
|
|
|
* async structure from the interrupt chain if necessary, and we free
|
|
|
|
* that IRQ if nothing is left in the chain.
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *state = tty->driver_data;
|
2012-03-05 13:52:43 +00:00
|
|
|
struct tty_port *port = &state->tport;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:49 +00:00
|
|
|
if (tty_port_close_start(port, tty, filp) == 0)
|
2005-04-16 22:20:36 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* At this point we stop accepting input. To do this, we
|
|
|
|
* disable the receive line status interrupts, and tell the
|
|
|
|
* interrupt driver to stop checking the data ready bit in the
|
|
|
|
* line status register.
|
|
|
|
*/
|
2012-03-05 13:52:20 +00:00
|
|
|
state->read_status_mask &= ~UART_LSR_DR;
|
2016-04-10 00:53:25 +00:00
|
|
|
if (tty_port_initialized(port)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
/* disable receive interrupts */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_RBF;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
/* clear any pending receive interrupt */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_RBF;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
|
|
* has completely drained; this is especially
|
|
|
|
* important if there is a transmit FIFO!
|
|
|
|
*/
|
2012-03-05 13:52:20 +00:00
|
|
|
rs_wait_until_sent(tty, state->timeout);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2012-03-05 13:52:22 +00:00
|
|
|
shutdown(tty, state);
|
2008-04-30 07:53:59 +00:00
|
|
|
rs_flush_buffer(tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
tty_ldisc_flush(tty);
|
2012-03-05 13:52:43 +00:00
|
|
|
port->tty = NULL;
|
2012-03-05 13:52:48 +00:00
|
|
|
|
|
|
|
tty_port_close_end(port, tty);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* rs_wait_until_sent() --- wait until the transmitter is empty
|
|
|
|
*/
|
|
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long orig_jiffies, char_time;
|
|
|
|
int lsr;
|
|
|
|
|
|
|
|
orig_jiffies = jiffies;
|
2008-04-30 07:53:59 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
|
|
* send a single character, and make it at least 1. The check
|
|
|
|
* interval should also be less than the timeout.
|
|
|
|
*
|
|
|
|
* Note: we have to use pretty tight timings here to satisfy
|
|
|
|
* the NIST-PCTS.
|
|
|
|
*/
|
2021-07-14 09:13:07 +00:00
|
|
|
char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
|
2005-04-16 22:20:36 +00:00
|
|
|
char_time = char_time / 5;
|
|
|
|
if (char_time == 0)
|
|
|
|
char_time = 1;
|
|
|
|
if (timeout)
|
|
|
|
char_time = min_t(unsigned long, char_time, timeout);
|
|
|
|
/*
|
|
|
|
* If the transmitter hasn't cleared in twice the approximate
|
|
|
|
* amount of time to send the entire FIFO, it probably won't
|
|
|
|
* ever clear. This assumes the UART isn't doing flow
|
|
|
|
* control, which is currently the case. Hence, if it ever
|
|
|
|
* takes longer than info->timeout, this is probably due to a
|
|
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
|
|
|
* 2*info->timeout.
|
|
|
|
*/
|
|
|
|
if (!timeout || timeout > 2*info->timeout)
|
|
|
|
timeout = 2*info->timeout;
|
|
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
|
|
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
|
|
|
|
printk("jiff=%lu...", jiffies);
|
|
|
|
#endif
|
2021-07-14 09:13:11 +00:00
|
|
|
while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
|
|
printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
|
|
|
|
#endif
|
|
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
|
|
if (signal_pending(current))
|
|
|
|
break;
|
|
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
|
|
break;
|
|
|
|
}
|
2007-05-08 07:30:52 +00:00
|
|
|
__set_current_state(TASK_RUNNING);
|
2011-07-14 12:35:13 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
|
|
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
|
|
*/
|
|
|
|
static void rs_hangup(struct tty_struct *tty)
|
|
|
|
{
|
2012-03-05 13:52:20 +00:00
|
|
|
struct serial_state *info = tty->driver_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
rs_flush_buffer(tty);
|
2012-03-05 13:52:22 +00:00
|
|
|
shutdown(tty, info);
|
2012-03-05 13:52:26 +00:00
|
|
|
info->tport.count = 0;
|
2023-01-17 09:03:49 +00:00
|
|
|
tty_port_set_active(&info->tport, false);
|
2012-03-05 13:52:24 +00:00
|
|
|
info->tport.tty = NULL;
|
|
|
|
wake_up_interruptible(&info->tport.open_wait);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is called whenever a serial port is opened. It
|
|
|
|
* enables interrupts for a serial port, linking in its async structure into
|
|
|
|
* the IRQ chain. It also performs the serial-specific
|
|
|
|
* initialization for the tty structure.
|
|
|
|
*/
|
|
|
|
static int rs_open(struct tty_struct *tty, struct file * filp)
|
|
|
|
{
|
2021-07-14 09:13:08 +00:00
|
|
|
struct tty_port *port = tty->port;
|
|
|
|
struct serial_state *info = container_of(port, struct serial_state,
|
|
|
|
tport);
|
2012-03-05 13:52:01 +00:00
|
|
|
int retval;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:43 +00:00
|
|
|
port->count++;
|
|
|
|
port->tty = tty;
|
2012-03-05 13:52:20 +00:00
|
|
|
tty->driver_data = info;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:22 +00:00
|
|
|
retval = startup(tty, info);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (retval) {
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2012-03-05 13:52:47 +00:00
|
|
|
return tty_port_block_til_ready(port, tty, filp);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* /proc fs routines....
|
|
|
|
*/
|
|
|
|
|
2012-03-05 13:52:44 +00:00
|
|
|
static inline void line_info(struct seq_file *m, int line,
|
|
|
|
struct serial_state *state)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
char stat_buf[30], control, status;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2012-03-05 13:52:44 +00:00
|
|
|
seq_printf(m, "%d: uart:amiga_builtin", line);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
status = ciab.pra;
|
2016-04-10 00:53:25 +00:00
|
|
|
control = tty_port_initialized(&state->tport) ? state->MCR : status;
|
2005-04-16 22:20:36 +00:00
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
stat_buf[0] = 0;
|
|
|
|
stat_buf[1] = 0;
|
|
|
|
if(!(control & SER_RTS))
|
|
|
|
strcat(stat_buf, "|RTS");
|
|
|
|
if(!(status & SER_CTS))
|
|
|
|
strcat(stat_buf, "|CTS");
|
|
|
|
if(!(control & SER_DTR))
|
|
|
|
strcat(stat_buf, "|DTR");
|
|
|
|
if(!(status & SER_DSR))
|
|
|
|
strcat(stat_buf, "|DSR");
|
|
|
|
if(!(status & SER_DCD))
|
|
|
|
strcat(stat_buf, "|CD");
|
|
|
|
|
2012-03-05 13:52:20 +00:00
|
|
|
if (state->quot)
|
|
|
|
seq_printf(m, " baud:%d", state->baud_base / state->quot);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (state->icount.frame)
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " fe:%d", state->icount.frame);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (state->icount.parity)
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " pe:%d", state->icount.parity);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (state->icount.brk)
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " brk:%d", state->icount.brk);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (state->icount.overrun)
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " oe:%d", state->icount.overrun);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Last thing is the RS-232 status lines
|
|
|
|
*/
|
2009-03-31 22:19:23 +00:00
|
|
|
seq_printf(m, " %s\n", stat_buf+1);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2009-03-31 22:19:23 +00:00
|
|
|
static int rs_proc_show(struct seq_file *m, void *v)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2021-07-14 09:13:05 +00:00
|
|
|
seq_printf(m, "serinfo:1.0 driver:4.30\n");
|
2021-07-14 09:13:13 +00:00
|
|
|
line_info(m, 0, &serial_state);
|
2009-03-31 22:19:23 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ---------------------------------------------------------------------
|
|
|
|
* rs_init() and friends
|
|
|
|
*
|
|
|
|
* rs_init() is called at boot-time to initialize the serial driver.
|
|
|
|
* ---------------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
2006-10-02 09:17:18 +00:00
|
|
|
static const struct tty_operations serial_ops = {
|
2005-04-16 22:20:36 +00:00
|
|
|
.open = rs_open,
|
|
|
|
.close = rs_close,
|
|
|
|
.write = rs_write,
|
|
|
|
.put_char = rs_put_char,
|
|
|
|
.flush_chars = rs_flush_chars,
|
|
|
|
.write_room = rs_write_room,
|
|
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
|
|
.flush_buffer = rs_flush_buffer,
|
|
|
|
.ioctl = rs_ioctl,
|
|
|
|
.throttle = rs_throttle,
|
|
|
|
.unthrottle = rs_unthrottle,
|
|
|
|
.set_termios = rs_set_termios,
|
|
|
|
.stop = rs_stop,
|
|
|
|
.start = rs_start,
|
|
|
|
.hangup = rs_hangup,
|
|
|
|
.break_ctl = rs_break,
|
|
|
|
.send_xchar = rs_send_xchar,
|
|
|
|
.wait_until_sent = rs_wait_until_sent,
|
|
|
|
.tiocmget = rs_tiocmget,
|
|
|
|
.tiocmset = rs_tiocmset,
|
2010-09-16 17:21:52 +00:00
|
|
|
.get_icount = rs_get_icount,
|
2018-09-12 01:59:13 +00:00
|
|
|
.set_serial = set_serial_info,
|
|
|
|
.get_serial = get_serial_info,
|
2018-04-13 19:04:45 +00:00
|
|
|
.proc_show = rs_proc_show,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2023-01-17 09:03:52 +00:00
|
|
|
static bool amiga_carrier_raised(struct tty_port *port)
|
2012-03-05 13:52:46 +00:00
|
|
|
{
|
|
|
|
return !(ciab.pra & SER_DCD);
|
|
|
|
}
|
|
|
|
|
2023-01-17 09:03:57 +00:00
|
|
|
static void amiga_dtr_rts(struct tty_port *port, bool active)
|
2012-03-05 13:52:46 +00:00
|
|
|
{
|
|
|
|
struct serial_state *info = container_of(port, struct serial_state,
|
|
|
|
tport);
|
|
|
|
unsigned long flags;
|
|
|
|
|
2023-01-17 09:03:57 +00:00
|
|
|
if (active)
|
2012-03-05 13:52:46 +00:00
|
|
|
info->MCR |= SER_DTR|SER_RTS;
|
|
|
|
else
|
|
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct tty_port_operations amiga_port_ops = {
|
|
|
|
.carrier_raised = amiga_carrier_raised,
|
|
|
|
.dtr_rts = amiga_dtr_rts,
|
|
|
|
};
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* The serial driver boot-time initialization code!
|
|
|
|
*/
|
2009-04-05 11:12:30 +00:00
|
|
|
static int __init amiga_serial_probe(struct platform_device *pdev)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2021-07-14 09:13:13 +00:00
|
|
|
struct serial_state *state = &serial_state;
|
2021-07-23 07:43:12 +00:00
|
|
|
struct tty_driver *driver;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long flags;
|
2008-12-30 13:13:41 +00:00
|
|
|
int error;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2021-07-23 07:43:13 +00:00
|
|
|
driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
|
|
|
|
if (IS_ERR(driver))
|
|
|
|
return PTR_ERR(driver);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
|
2021-07-23 07:43:12 +00:00
|
|
|
driver->driver_name = "amiserial";
|
|
|
|
driver->name = "ttyS";
|
|
|
|
driver->major = TTY_MAJOR;
|
|
|
|
driver->minor_start = 64;
|
|
|
|
driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
|
|
driver->subtype = SERIAL_TYPE_NORMAL;
|
|
|
|
driver->init_termios = tty_std_termios;
|
|
|
|
driver->init_termios.c_cflag =
|
2005-04-16 22:20:36 +00:00
|
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
2021-07-23 07:43:12 +00:00
|
|
|
tty_set_operations(driver, &serial_ops);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2021-07-14 09:13:09 +00:00
|
|
|
memset(state, 0, sizeof(*state));
|
2021-07-14 09:13:11 +00:00
|
|
|
state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
|
2012-03-05 13:52:24 +00:00
|
|
|
tty_port_init(&state->tport);
|
2012-03-05 13:52:46 +00:00
|
|
|
state->tport.ops = &amiga_port_ops;
|
2021-07-23 07:43:12 +00:00
|
|
|
tty_port_link_device(&state->tport, driver, 0);
|
2012-08-07 19:47:51 +00:00
|
|
|
|
2021-07-23 07:43:12 +00:00
|
|
|
error = tty_register_driver(driver);
|
2012-08-07 19:47:51 +00:00
|
|
|
if (error)
|
2021-07-23 07:43:16 +00:00
|
|
|
goto fail_tty_driver_kref_put;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:44 +00:00
|
|
|
printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Hardware set up */
|
|
|
|
|
|
|
|
state->baud_base = amiga_colorclock;
|
|
|
|
|
|
|
|
/* set ISRs, and then disable the rx interrupts */
|
2008-12-30 13:13:41 +00:00
|
|
|
error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
|
|
|
|
if (error)
|
|
|
|
goto fail_unregister;
|
|
|
|
|
2011-09-22 08:59:15 +00:00
|
|
|
error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
|
2008-12-30 13:13:41 +00:00
|
|
|
"serial RX", state);
|
|
|
|
if (error)
|
|
|
|
goto fail_free_irq;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2010-04-06 21:34:46 +00:00
|
|
|
local_irq_save(flags);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* turn off Rx and Tx interrupts */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_RBF | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
|
|
|
/* clear any pending interrupt */
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intreq = IF_RBF | IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
mb();
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* set the appropriate directions for the modem control flags,
|
|
|
|
* and clear RTS and DTR
|
|
|
|
*/
|
|
|
|
ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
|
|
|
|
ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
|
|
|
|
|
2009-04-05 11:12:30 +00:00
|
|
|
platform_set_drvdata(pdev, state);
|
|
|
|
|
2021-07-23 07:43:12 +00:00
|
|
|
serial_driver = driver;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
2008-12-30 13:13:41 +00:00
|
|
|
|
|
|
|
fail_free_irq:
|
|
|
|
free_irq(IRQ_AMIGA_TBE, state);
|
|
|
|
fail_unregister:
|
2021-07-23 07:43:12 +00:00
|
|
|
tty_unregister_driver(driver);
|
2021-07-23 07:43:16 +00:00
|
|
|
fail_tty_driver_kref_put:
|
2012-11-15 08:49:56 +00:00
|
|
|
tty_port_destroy(&state->tport);
|
2021-07-23 07:43:16 +00:00
|
|
|
tty_driver_kref_put(driver);
|
2008-12-30 13:13:41 +00:00
|
|
|
return error;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2009-04-05 11:12:30 +00:00
|
|
|
static int __exit amiga_serial_remove(struct platform_device *pdev)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2009-04-05 11:12:30 +00:00
|
|
|
struct serial_state *state = platform_get_drvdata(pdev);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2021-03-02 06:22:04 +00:00
|
|
|
tty_unregister_driver(serial_driver);
|
2021-07-23 07:43:16 +00:00
|
|
|
tty_driver_kref_put(serial_driver);
|
2012-11-15 08:49:56 +00:00
|
|
|
tty_port_destroy(&state->tport);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-03-05 13:52:20 +00:00
|
|
|
free_irq(IRQ_AMIGA_TBE, state);
|
|
|
|
free_irq(IRQ_AMIGA_RBF, state);
|
2008-12-30 13:13:41 +00:00
|
|
|
|
2021-03-02 06:22:04 +00:00
|
|
|
return 0;
|
2009-04-05 11:12:30 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver amiga_serial_driver = {
|
|
|
|
.remove = __exit_p(amiga_serial_remove),
|
|
|
|
.driver = {
|
|
|
|
.name = "amiga-serial",
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2013-03-05 03:29:20 +00:00
|
|
|
module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
2008-10-26 18:51:14 +00:00
|
|
|
#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
* Serial console driver
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void amiga_serial_putc(char c)
|
|
|
|
{
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.serdat = (unsigned char)c | 0x100;
|
|
|
|
while (!(amiga_custom.serdatr & 0x2000))
|
2005-04-16 22:20:36 +00:00
|
|
|
barrier();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Print a string to the serial port trying not to disturb
|
|
|
|
* any possible real use of the port...
|
|
|
|
*
|
|
|
|
* The console must be locked when we get here.
|
|
|
|
*/
|
|
|
|
static void serial_console_write(struct console *co, const char *s,
|
|
|
|
unsigned count)
|
|
|
|
{
|
2021-07-14 09:13:11 +00:00
|
|
|
unsigned short intena = amiga_custom.intenar;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_TBE;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
while (count--) {
|
|
|
|
if (*s == '\n')
|
|
|
|
amiga_serial_putc('\r');
|
|
|
|
amiga_serial_putc(*s++);
|
|
|
|
}
|
|
|
|
|
2021-07-14 09:13:11 +00:00
|
|
|
amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct tty_driver *serial_console_device(struct console *c, int *index)
|
|
|
|
{
|
|
|
|
*index = 0;
|
|
|
|
return serial_driver;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct console sercons = {
|
|
|
|
.name = "ttyS",
|
|
|
|
.write = serial_console_write,
|
|
|
|
.device = serial_console_device,
|
|
|
|
.flags = CON_PRINTBUFFER,
|
|
|
|
.index = -1,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Register console.
|
|
|
|
*/
|
|
|
|
static int __init amiserial_console_init(void)
|
|
|
|
{
|
2013-11-22 15:47:27 +00:00
|
|
|
if (!MACH_IS_AMIGA)
|
|
|
|
return -ENODEV;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
register_console(&sercons);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
console_initcall(amiserial_console_init);
|
2008-10-26 18:51:14 +00:00
|
|
|
|
|
|
|
#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2009-04-05 11:12:30 +00:00
|
|
|
MODULE_ALIAS("platform:amiga-serial");
|