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![Johan Hovold](/assets/img/avatar_default.png)
commit 1d31a831cc
upstream.
Changing the port closing_wait parameter is a privileged operation.
Add the missing check to TIOCSSERIAL so that -EPERM is returned in case
an unprivileged user tries to change the closing-wait setting.
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210407102334.32361-9-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1807 lines
44 KiB
C
1807 lines
44 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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* therefore other ports should should only use 65 upwards.
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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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/*
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* Serial driver configuration section. Here are the various options:
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*
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* SERIAL_PARANOIA_CHECK
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* Check the magic number for the async_structure where
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* ever possible.
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*/
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#include <linux/delay.h>
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#undef SERIAL_PARANOIA_CHECK
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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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/* Sanity checks */
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#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
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#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
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tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
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#else
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#define DBG_CNT(s)
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#endif
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/*
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* End of serial driver configuration section.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/serial.h>
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#include <linux/serial_reg.h>
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static char *serial_version = "4.30";
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/circ_buf.h>
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#include <linux/console.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/platform_device.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/amigahw.h>
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#include <asm/amigaints.h>
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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 xmit_fifo_size;
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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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#define custom amiga_custom
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static char *serial_name = "Amiga-builtin serial driver";
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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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static unsigned char current_ctl_bits;
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static void change_speed(struct tty_struct *tty, struct serial_state *info,
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struct ktermios *old);
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static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
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static struct serial_state rs_table[1];
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#define NR_PORTS ARRAY_SIZE(rs_table)
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#include <linux/uaccess.h>
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#define serial_isroot() (capable(CAP_SYS_ADMIN))
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static inline int serial_paranoia_check(struct serial_state *info,
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char *name, const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char *badmagic =
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"Warning: bad magic number for serial struct (%s) in %s\n";
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static const char *badinfo =
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"Warning: null async_struct for (%s) in %s\n";
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if (!info) {
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printk(badinfo, name, routine);
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return 1;
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}
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if (info->magic != SERIAL_MAGIC) {
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printk(badmagic, name, routine);
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return 1;
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}
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#endif
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return 0;
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}
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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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* This routines are called before setting or resetting tty->stopped.
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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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struct serial_state *info = tty->driver_data;
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_stop"))
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return;
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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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custom.intena = IF_TBE;
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mb();
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custom.intreq = IF_TBE;
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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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struct serial_state *info = tty->driver_data;
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_start"))
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return;
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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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custom.intena = IF_SETCLR | IF_TBE;
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mb();
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/* set a pending Tx Interrupt, transmitter should restart now */
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custom.intreq = IF_SETCLR | IF_TBE;
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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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* Here starts the interrupt handling routines. All of the following
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* subroutines are declared as inline and are folded into
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* rs_interrupt(). They were separated out for readability's sake.
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*
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* Note: rs_interrupt() is a "fast" interrupt, which means that it
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* runs with interrupts turned off. People who may want to modify
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* rs_interrupt() should try to keep the interrupt handler as fast as
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* possible. After you are done making modifications, it is not a bad
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* idea to do:
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*
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* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
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*
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* and look at the resulting assemble code in serial.s.
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*
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* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
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* -----------------------------------------------------------------------
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*/
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static void receive_chars(struct serial_state *info)
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{
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int status;
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int serdatr;
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unsigned char ch, flag;
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struct async_icount *icount;
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int oe = 0;
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icount = &info->icount;
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status = UART_LSR_DR; /* We obviously have a character! */
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serdatr = custom.serdatr;
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mb();
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custom.intreq = IF_RBF;
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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
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flag = TTY_NORMAL;
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/*
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* We don't handle parity or frame errors - but I have left
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* the code in, since I'm not sure that the errors can't be
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* detected.
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*/
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if (status & (UART_LSR_BI | UART_LSR_PE |
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UART_LSR_FE | UART_LSR_OE)) {
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/*
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* For statistics only
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*/
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if (status & UART_LSR_BI) {
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status &= ~(UART_LSR_FE | UART_LSR_PE);
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icount->brk++;
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} else if (status & UART_LSR_PE)
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icount->parity++;
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else if (status & UART_LSR_FE)
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icount->frame++;
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if (status & UART_LSR_OE)
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icount->overrun++;
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/*
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* Now check to see if character should be
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* ignored, and mask off conditions which
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* should be ignored.
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*/
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if (status & info->ignore_status_mask)
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goto out;
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status &= info->read_status_mask;
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if (status & (UART_LSR_BI)) {
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#ifdef SERIAL_DEBUG_INTR
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printk("handling break....");
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#endif
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flag = TTY_BREAK;
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if (info->tport.flags & ASYNC_SAK)
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do_SAK(info->tport.tty);
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} else if (status & UART_LSR_PE)
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flag = TTY_PARITY;
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else if (status & UART_LSR_FE)
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flag = TTY_FRAME;
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if (status & UART_LSR_OE) {
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/*
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* Overrun is special, since it's
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* reported immediately, and doesn't
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* affect the current character
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*/
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oe = 1;
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}
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}
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tty_insert_flip_char(&info->tport, ch, flag);
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if (oe == 1)
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tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
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tty_flip_buffer_push(&info->tport);
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out:
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return;
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}
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static void transmit_chars(struct serial_state *info)
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{
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custom.intreq = IF_TBE;
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mb();
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if (info->x_char) {
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custom.serdat = info->x_char | 0x100;
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mb();
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info->icount.tx++;
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info->x_char = 0;
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return;
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}
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if (info->xmit.head == info->xmit.tail
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|| info->tport.tty->stopped
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|| info->tport.tty->hw_stopped) {
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info->IER &= ~UART_IER_THRI;
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custom.intena = IF_TBE;
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mb();
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return;
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}
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custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
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mb();
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info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
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info->icount.tx++;
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if (CIRC_CNT(info->xmit.head,
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info->xmit.tail,
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SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
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tty_wakeup(info->tport.tty);
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#ifdef SERIAL_DEBUG_INTR
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printk("THRE...");
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#endif
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if (info->xmit.head == info->xmit.tail) {
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custom.intena = IF_TBE;
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mb();
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info->IER &= ~UART_IER_THRI;
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}
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}
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static void check_modem_status(struct serial_state *info)
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{
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struct tty_port *port = &info->tport;
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unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
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unsigned char dstatus;
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struct async_icount *icount;
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/* Determine bits that have changed */
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dstatus = status ^ current_ctl_bits;
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current_ctl_bits = status;
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if (dstatus) {
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icount = &info->icount;
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/* update input line counters */
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if (dstatus & SER_DSR)
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icount->dsr++;
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if (dstatus & SER_DCD) {
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icount->dcd++;
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}
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if (dstatus & SER_CTS)
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icount->cts++;
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wake_up_interruptible(&port->delta_msr_wait);
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}
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if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
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#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
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printk("ttyS%d CD now %s...", info->line,
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(!(status & SER_DCD)) ? "on" : "off");
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#endif
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if (!(status & SER_DCD))
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wake_up_interruptible(&port->open_wait);
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else {
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#ifdef SERIAL_DEBUG_OPEN
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printk("doing serial hangup...");
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#endif
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if (port->tty)
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tty_hangup(port->tty);
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}
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}
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if (tty_port_cts_enabled(port)) {
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if (port->tty->hw_stopped) {
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if (!(status & SER_CTS)) {
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#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
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printk("CTS tx start...");
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#endif
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port->tty->hw_stopped = 0;
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info->IER |= UART_IER_THRI;
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custom.intena = IF_SETCLR | IF_TBE;
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mb();
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/* set a pending Tx Interrupt, transmitter should restart now */
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custom.intreq = IF_SETCLR | IF_TBE;
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mb();
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tty_wakeup(port->tty);
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return;
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}
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} else {
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if ((status & SER_CTS)) {
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#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
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printk("CTS tx stop...");
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#endif
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port->tty->hw_stopped = 1;
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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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custom.intena = IF_TBE;
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mb();
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custom.intreq = IF_TBE;
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mb();
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}
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}
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}
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}
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static irqreturn_t ser_vbl_int( int irq, void *data)
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{
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/* vbl is just a periodic interrupt we tie into to update modem status */
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struct serial_state *info = data;
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/*
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* TBD - is it better to unregister from this interrupt or to
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* ignore it if MSI is clear ?
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*/
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if(info->IER & UART_IER_MSI)
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check_modem_status(info);
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return IRQ_HANDLED;
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}
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|
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static irqreturn_t ser_rx_int(int irq, void *dev_id)
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{
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struct serial_state *info = dev_id;
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#ifdef SERIAL_DEBUG_INTR
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printk("ser_rx_int...");
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#endif
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|
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if (!info->tport.tty)
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return IRQ_NONE;
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|
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receive_chars(info);
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#ifdef SERIAL_DEBUG_INTR
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printk("end.\n");
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#endif
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return IRQ_HANDLED;
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}
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|
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static irqreturn_t ser_tx_int(int irq, void *dev_id)
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{
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struct serial_state *info = dev_id;
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|
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if (custom.serdatr & SDR_TBE) {
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#ifdef SERIAL_DEBUG_INTR
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printk("ser_tx_int...");
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#endif
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|
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if (!info->tport.tty)
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return IRQ_NONE;
|
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|
|
transmit_chars(info);
|
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#ifdef SERIAL_DEBUG_INTR
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printk("end.\n");
|
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#endif
|
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}
|
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return IRQ_HANDLED;
|
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}
|
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|
|
/*
|
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* -------------------------------------------------------------------
|
|
* 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.
|
|
* ---------------------------------------------------------------
|
|
*/
|
|
|
|
static int startup(struct tty_struct *tty, struct serial_state *info)
|
|
{
|
|
struct tty_port *port = &info->tport;
|
|
unsigned long flags;
|
|
int retval=0;
|
|
unsigned long page;
|
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|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
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return -ENOMEM;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (tty_port_initialized(port)) {
|
|
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 */
|
|
|
|
custom.intreq = IF_RBF;
|
|
mb();
|
|
|
|
retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
|
|
if (retval) {
|
|
if (serial_isroot()) {
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
retval = 0;
|
|
}
|
|
goto errout;
|
|
}
|
|
|
|
/* enable both Rx and Tx interrupts */
|
|
custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
|
|
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;
|
|
if (C_BAUD(tty))
|
|
info->MCR = SER_DTR | SER_RTS;
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
clear_bit(TTY_IO_ERROR, &tty->flags);
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
|
|
/*
|
|
* and set the speed of the serial port
|
|
*/
|
|
change_speed(tty, info, NULL);
|
|
|
|
tty_port_set_initialized(port, 1);
|
|
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.
|
|
*/
|
|
static void shutdown(struct tty_struct *tty, struct serial_state *info)
|
|
{
|
|
unsigned long flags;
|
|
struct serial_state *state;
|
|
|
|
if (!tty_port_initialized(&info->tport))
|
|
return;
|
|
|
|
state = info;
|
|
|
|
#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
|
|
*/
|
|
wake_up_interruptible(&info->tport.delta_msr_wait);
|
|
|
|
/*
|
|
* Free the IRQ, if necessary
|
|
*/
|
|
free_irq(IRQ_AMIGA_VERTB, info);
|
|
|
|
if (info->xmit.buf) {
|
|
free_page((unsigned long) info->xmit.buf);
|
|
info->xmit.buf = NULL;
|
|
}
|
|
|
|
info->IER = 0;
|
|
custom.intena = IF_RBF | IF_TBE;
|
|
mb();
|
|
|
|
/* disable break condition */
|
|
custom.adkcon = AC_UARTBRK;
|
|
mb();
|
|
|
|
if (C_HUPCL(tty))
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
|
|
tty_port_set_initialized(&info->tport, 0);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* This routine is called to set the UART divisor registers to match
|
|
* the specified baud rate for a serial port.
|
|
*/
|
|
static void change_speed(struct tty_struct *tty, struct serial_state *info,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct tty_port *port = &info->tport;
|
|
int quot = 0, baud_base, baud;
|
|
unsigned cflag, cval = 0;
|
|
int bits;
|
|
unsigned long flags;
|
|
|
|
cflag = tty->termios.c_cflag;
|
|
|
|
/* 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;
|
|
#ifdef CMSPAR
|
|
if (cflag & CMSPAR)
|
|
cval |= UART_LCR_SPAR;
|
|
#endif
|
|
|
|
/* Determine divisor based on baud rate */
|
|
baud = tty_get_baud_rate(tty);
|
|
if (!baud)
|
|
baud = 9600; /* B0 transition handled in rs_set_termios */
|
|
baud_base = info->baud_base;
|
|
if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
|
|
quot = info->custom_divisor;
|
|
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) {
|
|
/* FIXME: Will need updating for new tty in the end */
|
|
tty->termios.c_cflag &= ~CBAUD;
|
|
tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
|
|
baud = tty_get_baud_rate(tty);
|
|
if (!baud)
|
|
baud = 9600;
|
|
if (baud == 38400 &&
|
|
(port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
|
|
quot = info->custom_divisor;
|
|
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;
|
|
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
|
|
|
/* CTS flow control flag and modem status interrupts */
|
|
info->IER &= ~UART_IER_MSI;
|
|
if (port->flags & ASYNC_HARDPPS_CD)
|
|
info->IER |= UART_IER_MSI;
|
|
tty_port_set_cts_flow(port, cflag & CRTSCTS);
|
|
if (cflag & CRTSCTS)
|
|
info->IER |= UART_IER_MSI;
|
|
tty_port_set_check_carrier(port, ~cflag & CLOCAL);
|
|
if (~cflag & CLOCAL)
|
|
info->IER |= UART_IER_MSI;
|
|
/* TBD:
|
|
* Does clearing IER_MSI imply that we should disable the VBL interrupt ?
|
|
*/
|
|
|
|
/*
|
|
* Set up parity check flag
|
|
*/
|
|
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
|
|
if (I_INPCK(tty))
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
|
if (I_BRKINT(tty) || I_PARMRK(tty))
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
info->ignore_status_mask = 0;
|
|
if (I_IGNPAR(tty))
|
|
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
|
if (I_IGNBRK(tty)) {
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
|
/*
|
|
* If we're ignore parity and break indicators, ignore
|
|
* overruns too. (For real raw support).
|
|
*/
|
|
if (I_IGNPAR(tty))
|
|
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);
|
|
|
|
custom.serper = serper;
|
|
mb();
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int rs_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct serial_state *info;
|
|
unsigned long flags;
|
|
|
|
info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
|
|
return 0;
|
|
|
|
if (!info->xmit.buf)
|
|
return 0;
|
|
|
|
local_irq_save(flags);
|
|
if (CIRC_SPACE(info->xmit.head,
|
|
info->xmit.tail,
|
|
SERIAL_XMIT_SIZE) == 0) {
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
info->xmit.buf[info->xmit.head++] = ch;
|
|
info->xmit.head &= SERIAL_XMIT_SIZE-1;
|
|
local_irq_restore(flags);
|
|
return 1;
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
|
return;
|
|
|
|
if (info->xmit.head == info->xmit.tail
|
|
|| tty->stopped
|
|
|| tty->hw_stopped
|
|
|| !info->xmit.buf)
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
info->IER |= UART_IER_THRI;
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
|
|
{
|
|
int c, ret = 0;
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
|
return 0;
|
|
|
|
if (!info->xmit.buf)
|
|
return 0;
|
|
|
|
local_irq_save(flags);
|
|
while (1) {
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
|
info->xmit.tail,
|
|
SERIAL_XMIT_SIZE);
|
|
if (count < c)
|
|
c = count;
|
|
if (c <= 0) {
|
|
break;
|
|
}
|
|
memcpy(info->xmit.buf + info->xmit.head, buf, c);
|
|
info->xmit.head = ((info->xmit.head + c) &
|
|
(SERIAL_XMIT_SIZE-1));
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
if (info->xmit.head != info->xmit.tail
|
|
&& !tty->stopped
|
|
&& !tty->hw_stopped
|
|
&& !(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
local_irq_disable();
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
|
return 0;
|
|
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
|
return 0;
|
|
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
|
}
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
|
return;
|
|
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)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
|
|
return;
|
|
|
|
info->x_char = ch;
|
|
if (ch) {
|
|
/* Make sure transmit interrupts are on */
|
|
|
|
/* Check this ! */
|
|
local_irq_save(flags);
|
|
if(!(custom.intenar & IF_TBE)) {
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
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)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
printk("throttle %s ....\n", tty_name(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty))
|
|
rs_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
if (C_CRTSCTS(tty))
|
|
info->MCR &= ~SER_RTS;
|
|
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
printk("unthrottle %s ....\n", tty_name(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else
|
|
rs_send_xchar(tty, START_CHAR(tty));
|
|
}
|
|
if (C_CRTSCTS(tty))
|
|
info->MCR |= SER_RTS;
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_ioctl() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
|
|
{
|
|
struct serial_state *state = tty->driver_data;
|
|
|
|
tty_lock(tty);
|
|
ss->line = tty->index;
|
|
ss->port = state->port;
|
|
ss->flags = state->tport.flags;
|
|
ss->xmit_fifo_size = state->xmit_fifo_size;
|
|
ss->baud_base = state->baud_base;
|
|
ss->close_delay = state->tport.close_delay;
|
|
ss->closing_wait = state->tport.closing_wait;
|
|
ss->custom_divisor = state->custom_divisor;
|
|
tty_unlock(tty);
|
|
return 0;
|
|
}
|
|
|
|
static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
|
|
{
|
|
struct serial_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->tport;
|
|
bool change_spd;
|
|
int retval = 0;
|
|
|
|
tty_lock(tty);
|
|
change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
|
|
ss->custom_divisor != state->custom_divisor;
|
|
if (ss->irq || ss->port != state->port ||
|
|
ss->xmit_fifo_size != state->xmit_fifo_size) {
|
|
tty_unlock(tty);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!serial_isroot()) {
|
|
if ((ss->baud_base != state->baud_base) ||
|
|
(ss->close_delay != port->close_delay) ||
|
|
(ss->closing_wait != port->closing_wait) ||
|
|
(ss->xmit_fifo_size != state->xmit_fifo_size) ||
|
|
((ss->flags & ~ASYNC_USR_MASK) !=
|
|
(port->flags & ~ASYNC_USR_MASK))) {
|
|
tty_unlock(tty);
|
|
return -EPERM;
|
|
}
|
|
port->flags = ((port->flags & ~ASYNC_USR_MASK) |
|
|
(ss->flags & ASYNC_USR_MASK));
|
|
state->custom_divisor = ss->custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
if (ss->baud_base < 9600) {
|
|
tty_unlock(tty);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
|
|
state->baud_base = ss->baud_base;
|
|
port->flags = ((port->flags & ~ASYNC_FLAGS) |
|
|
(ss->flags & ASYNC_FLAGS));
|
|
state->custom_divisor = ss->custom_divisor;
|
|
port->close_delay = ss->close_delay * HZ/100;
|
|
port->closing_wait = ss->closing_wait * HZ/100;
|
|
port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
check_and_exit:
|
|
if (tty_port_initialized(port)) {
|
|
if (change_spd) {
|
|
/* warn about deprecation unless clearing */
|
|
if (ss->flags & ASYNC_SPD_MASK)
|
|
dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
|
|
change_speed(tty, state, NULL);
|
|
}
|
|
} else
|
|
retval = startup(tty, state);
|
|
tty_unlock(tty);
|
|
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.
|
|
*/
|
|
static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
|
|
{
|
|
unsigned char status;
|
|
unsigned int result;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
status = custom.serdatr;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
|
|
if (copy_to_user(value, &result, sizeof(int)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int rs_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned char control, status;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
if (tty_io_error(tty))
|
|
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);
|
|
}
|
|
|
|
static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
|
|
unsigned int clear)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
if (tty_io_error(tty))
|
|
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
|
|
*/
|
|
static int rs_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_break"))
|
|
return -EINVAL;
|
|
|
|
local_irq_save(flags);
|
|
if (break_state == -1)
|
|
custom.adkcon = AC_SETCLR | AC_UARTBRK;
|
|
else
|
|
custom.adkcon = AC_UARTBRK;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
struct async_icount cnow;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
cnow = info->icount;
|
|
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;
|
|
}
|
|
|
|
static int rs_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
struct async_icount cprev, cnow; /* kernel counter temps */
|
|
void __user *argp = (void __user *)arg;
|
|
unsigned long flags;
|
|
DEFINE_WAIT(wait);
|
|
int ret;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCSERCONFIG) &&
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
|
|
if (tty_io_error(tty))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TIOCSERCONFIG:
|
|
return 0;
|
|
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return get_lsr_info(info, argp);
|
|
|
|
/*
|
|
* 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 */
|
|
cprev = info->icount;
|
|
local_irq_restore(flags);
|
|
while (1) {
|
|
prepare_to_wait(&info->tport.delta_msr_wait,
|
|
&wait, TASK_INTERRUPTIBLE);
|
|
local_irq_save(flags);
|
|
cnow = info->icount; /* atomic copy */
|
|
local_irq_restore(flags);
|
|
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
|
|
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
|
|
ret = -EIO; /* no change => error */
|
|
break;
|
|
}
|
|
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)) ) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
schedule();
|
|
/* see if a signal did it */
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
cprev = cnow;
|
|
}
|
|
finish_wait(&info->tport.delta_msr_wait, &wait);
|
|
return ret;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long flags;
|
|
unsigned int cflag = tty->termios.c_cflag;
|
|
|
|
change_speed(tty, info, old_termios);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
|
|
info->MCR |= SER_DTR;
|
|
if (!C_CRTSCTS(tty) || !tty_throttled(tty))
|
|
info->MCR |= SER_RTS;
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
|
|
tty->hw_stopped = 0;
|
|
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.....
|
|
*/
|
|
if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
|
|
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)
|
|
{
|
|
struct serial_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->tport;
|
|
|
|
if (serial_paranoia_check(state, tty->name, "rs_close"))
|
|
return;
|
|
|
|
if (tty_port_close_start(port, tty, filp) == 0)
|
|
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.
|
|
*/
|
|
state->read_status_mask &= ~UART_LSR_DR;
|
|
if (tty_port_initialized(port)) {
|
|
/* disable receive interrupts */
|
|
custom.intena = IF_RBF;
|
|
mb();
|
|
/* clear any pending receive interrupt */
|
|
custom.intreq = IF_RBF;
|
|
mb();
|
|
|
|
/*
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
* has completely drained; this is especially
|
|
* important if there is a transmit FIFO!
|
|
*/
|
|
rs_wait_until_sent(tty, state->timeout);
|
|
}
|
|
shutdown(tty, state);
|
|
rs_flush_buffer(tty);
|
|
|
|
tty_ldisc_flush(tty);
|
|
port->tty = NULL;
|
|
|
|
tty_port_close_end(port, tty);
|
|
}
|
|
|
|
/*
|
|
* rs_wait_until_sent() --- wait until the transmitter is empty
|
|
*/
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
int lsr;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
|
|
return;
|
|
|
|
if (info->xmit_fifo_size == 0)
|
|
return; /* Just in case.... */
|
|
|
|
orig_jiffies = jiffies;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
|
|
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
|
|
while(!((lsr = custom.serdatr) & SDR_TSRE)) {
|
|
#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;
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
#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)
|
|
{
|
|
struct serial_state *info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_hangup"))
|
|
return;
|
|
|
|
rs_flush_buffer(tty);
|
|
shutdown(tty, info);
|
|
info->tport.count = 0;
|
|
tty_port_set_active(&info->tport, 0);
|
|
info->tport.tty = NULL;
|
|
wake_up_interruptible(&info->tport.open_wait);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct serial_state *info = rs_table + tty->index;
|
|
struct tty_port *port = &info->tport;
|
|
int retval;
|
|
|
|
port->count++;
|
|
port->tty = tty;
|
|
tty->driver_data = info;
|
|
tty->port = port;
|
|
if (serial_paranoia_check(info, tty->name, "rs_open"))
|
|
return -ENODEV;
|
|
|
|
port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
retval = startup(tty, info);
|
|
if (retval) {
|
|
return retval;
|
|
}
|
|
|
|
return tty_port_block_til_ready(port, tty, filp);
|
|
}
|
|
|
|
/*
|
|
* /proc fs routines....
|
|
*/
|
|
|
|
static inline void line_info(struct seq_file *m, int line,
|
|
struct serial_state *state)
|
|
{
|
|
char stat_buf[30], control, status;
|
|
unsigned long flags;
|
|
|
|
seq_printf(m, "%d: uart:amiga_builtin", line);
|
|
|
|
local_irq_save(flags);
|
|
status = ciab.pra;
|
|
control = tty_port_initialized(&state->tport) ? state->MCR : status;
|
|
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");
|
|
|
|
if (state->quot)
|
|
seq_printf(m, " baud:%d", state->baud_base / state->quot);
|
|
|
|
seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
|
|
|
|
if (state->icount.frame)
|
|
seq_printf(m, " fe:%d", state->icount.frame);
|
|
|
|
if (state->icount.parity)
|
|
seq_printf(m, " pe:%d", state->icount.parity);
|
|
|
|
if (state->icount.brk)
|
|
seq_printf(m, " brk:%d", state->icount.brk);
|
|
|
|
if (state->icount.overrun)
|
|
seq_printf(m, " oe:%d", state->icount.overrun);
|
|
|
|
/*
|
|
* Last thing is the RS-232 status lines
|
|
*/
|
|
seq_printf(m, " %s\n", stat_buf+1);
|
|
}
|
|
|
|
static int rs_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
|
|
line_info(m, 0, &rs_table[0]);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* rs_init() and friends
|
|
*
|
|
* rs_init() is called at boot-time to initialize the serial driver.
|
|
* ---------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* This routine prints out the appropriate serial driver version
|
|
* number, and identifies which options were configured into this
|
|
* driver.
|
|
*/
|
|
static void show_serial_version(void)
|
|
{
|
|
printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
|
|
}
|
|
|
|
|
|
static const struct tty_operations serial_ops = {
|
|
.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,
|
|
.get_icount = rs_get_icount,
|
|
.set_serial = set_serial_info,
|
|
.get_serial = get_serial_info,
|
|
.proc_show = rs_proc_show,
|
|
};
|
|
|
|
static int amiga_carrier_raised(struct tty_port *port)
|
|
{
|
|
return !(ciab.pra & SER_DCD);
|
|
}
|
|
|
|
static void amiga_dtr_rts(struct tty_port *port, int raise)
|
|
{
|
|
struct serial_state *info = container_of(port, struct serial_state,
|
|
tport);
|
|
unsigned long flags;
|
|
|
|
if (raise)
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* The serial driver boot-time initialization code!
|
|
*/
|
|
static int __init amiga_serial_probe(struct platform_device *pdev)
|
|
{
|
|
unsigned long flags;
|
|
struct serial_state * state;
|
|
int error;
|
|
|
|
serial_driver = alloc_tty_driver(NR_PORTS);
|
|
if (!serial_driver)
|
|
return -ENOMEM;
|
|
|
|
show_serial_version();
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
serial_driver->driver_name = "amiserial";
|
|
serial_driver->name = "ttyS";
|
|
serial_driver->major = TTY_MAJOR;
|
|
serial_driver->minor_start = 64;
|
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
serial_driver->init_termios = tty_std_termios;
|
|
serial_driver->init_termios.c_cflag =
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(serial_driver, &serial_ops);
|
|
|
|
state = rs_table;
|
|
state->port = (int)&custom.serdatr; /* Just to give it a value */
|
|
state->custom_divisor = 0;
|
|
state->icount.cts = state->icount.dsr =
|
|
state->icount.rng = state->icount.dcd = 0;
|
|
state->icount.rx = state->icount.tx = 0;
|
|
state->icount.frame = state->icount.parity = 0;
|
|
state->icount.overrun = state->icount.brk = 0;
|
|
tty_port_init(&state->tport);
|
|
state->tport.ops = &amiga_port_ops;
|
|
tty_port_link_device(&state->tport, serial_driver, 0);
|
|
|
|
error = tty_register_driver(serial_driver);
|
|
if (error)
|
|
goto fail_put_tty_driver;
|
|
|
|
printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
|
|
|
|
/* Hardware set up */
|
|
|
|
state->baud_base = amiga_colorclock;
|
|
state->xmit_fifo_size = 1;
|
|
|
|
/* set ISRs, and then disable the rx interrupts */
|
|
error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
|
|
if (error)
|
|
goto fail_unregister;
|
|
|
|
error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
|
|
"serial RX", state);
|
|
if (error)
|
|
goto fail_free_irq;
|
|
|
|
local_irq_save(flags);
|
|
|
|
/* turn off Rx and Tx interrupts */
|
|
custom.intena = IF_RBF | IF_TBE;
|
|
mb();
|
|
|
|
/* clear any pending interrupt */
|
|
custom.intreq = IF_RBF | IF_TBE;
|
|
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 */
|
|
|
|
platform_set_drvdata(pdev, state);
|
|
|
|
return 0;
|
|
|
|
fail_free_irq:
|
|
free_irq(IRQ_AMIGA_TBE, state);
|
|
fail_unregister:
|
|
tty_unregister_driver(serial_driver);
|
|
fail_put_tty_driver:
|
|
tty_port_destroy(&state->tport);
|
|
put_tty_driver(serial_driver);
|
|
return error;
|
|
}
|
|
|
|
static int __exit amiga_serial_remove(struct platform_device *pdev)
|
|
{
|
|
int error;
|
|
struct serial_state *state = platform_get_drvdata(pdev);
|
|
|
|
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
|
|
error = tty_unregister_driver(serial_driver);
|
|
if (error)
|
|
printk("SERIAL: failed to unregister serial driver (%d)\n",
|
|
error);
|
|
put_tty_driver(serial_driver);
|
|
tty_port_destroy(&state->tport);
|
|
|
|
free_irq(IRQ_AMIGA_TBE, state);
|
|
free_irq(IRQ_AMIGA_RBF, state);
|
|
|
|
return error;
|
|
}
|
|
|
|
static struct platform_driver amiga_serial_driver = {
|
|
.remove = __exit_p(amiga_serial_remove),
|
|
.driver = {
|
|
.name = "amiga-serial",
|
|
},
|
|
};
|
|
|
|
module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
|
|
|
|
|
|
#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* Serial console driver
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static void amiga_serial_putc(char c)
|
|
{
|
|
custom.serdat = (unsigned char)c | 0x100;
|
|
while (!(custom.serdatr & 0x2000))
|
|
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)
|
|
{
|
|
unsigned short intena = custom.intenar;
|
|
|
|
custom.intena = IF_TBE;
|
|
|
|
while (count--) {
|
|
if (*s == '\n')
|
|
amiga_serial_putc('\r');
|
|
amiga_serial_putc(*s++);
|
|
}
|
|
|
|
custom.intena = IF_SETCLR | (intena & IF_TBE);
|
|
}
|
|
|
|
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)
|
|
{
|
|
if (!MACH_IS_AMIGA)
|
|
return -ENODEV;
|
|
|
|
register_console(&sercons);
|
|
return 0;
|
|
}
|
|
console_initcall(amiserial_console_init);
|
|
|
|
#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:amiga-serial");
|