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![Geert Uytterhoeven](/assets/img/avatar_default.png)
warning: ignoring return value of 'request_irq', declared with attribute warn_unused_result Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
1146 lines
30 KiB
C
1146 lines
30 KiB
C
/*
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* drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
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* implementation.
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* Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
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*
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* Based on atari_SCC.c which was
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* Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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* Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/kdev_t.h>
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#include <asm/io.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/mm.h>
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#include <linux/serial.h>
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#include <linux/fcntl.h>
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#include <linux/major.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/miscdevice.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/bootinfo.h>
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#ifdef CONFIG_MVME147_SCC
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#include <asm/mvme147hw.h>
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#endif
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#ifdef CONFIG_MVME162_SCC
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#include <asm/mvme16xhw.h>
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#endif
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#ifdef CONFIG_BVME6000_SCC
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#include <asm/bvme6000hw.h>
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#endif
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#include <linux/generic_serial.h>
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#include "scc.h"
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#define CHANNEL_A 0
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#define CHANNEL_B 1
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#define SCC_MINOR_BASE 64
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/* Shadows for all SCC write registers */
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static unsigned char scc_shadow[2][16];
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/* Location to access for SCC register access delay */
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static volatile unsigned char *scc_del = NULL;
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/* To keep track of STATUS_REG state for detection of Ext/Status int source */
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static unsigned char scc_last_status_reg[2];
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/***************************** Prototypes *****************************/
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/* Function prototypes */
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static void scc_disable_tx_interrupts(void * ptr);
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static void scc_enable_tx_interrupts(void * ptr);
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static void scc_disable_rx_interrupts(void * ptr);
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static void scc_enable_rx_interrupts(void * ptr);
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static int scc_carrier_raised(struct tty_port *port);
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static void scc_shutdown_port(void * ptr);
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static int scc_set_real_termios(void *ptr);
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static void scc_hungup(void *ptr);
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static void scc_close(void *ptr);
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static int scc_chars_in_buffer(void * ptr);
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static int scc_open(struct tty_struct * tty, struct file * filp);
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static int scc_ioctl(struct tty_struct * tty, struct file * filp,
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unsigned int cmd, unsigned long arg);
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static void scc_throttle(struct tty_struct *tty);
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static void scc_unthrottle(struct tty_struct *tty);
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static irqreturn_t scc_tx_int(int irq, void *data);
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static irqreturn_t scc_rx_int(int irq, void *data);
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static irqreturn_t scc_stat_int(int irq, void *data);
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static irqreturn_t scc_spcond_int(int irq, void *data);
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static void scc_setsignals(struct scc_port *port, int dtr, int rts);
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static int scc_break_ctl(struct tty_struct *tty, int break_state);
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static struct tty_driver *scc_driver;
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static struct scc_port scc_ports[2];
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/*---------------------------------------------------------------------------
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* Interface from generic_serial.c back here
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*--------------------------------------------------------------------------*/
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static struct real_driver scc_real_driver = {
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scc_disable_tx_interrupts,
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scc_enable_tx_interrupts,
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scc_disable_rx_interrupts,
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scc_enable_rx_interrupts,
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scc_shutdown_port,
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scc_set_real_termios,
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scc_chars_in_buffer,
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scc_close,
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scc_hungup,
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NULL
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};
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static const struct tty_operations scc_ops = {
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.open = scc_open,
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.close = gs_close,
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.write = gs_write,
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.put_char = gs_put_char,
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.flush_chars = gs_flush_chars,
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.write_room = gs_write_room,
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.chars_in_buffer = gs_chars_in_buffer,
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.flush_buffer = gs_flush_buffer,
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.ioctl = scc_ioctl,
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.throttle = scc_throttle,
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.unthrottle = scc_unthrottle,
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.set_termios = gs_set_termios,
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.stop = gs_stop,
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.start = gs_start,
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.hangup = gs_hangup,
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.break_ctl = scc_break_ctl,
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};
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static const struct tty_port_operations scc_port_ops = {
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.carrier_raised = scc_carrier_raised,
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};
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/*----------------------------------------------------------------------------
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* vme_scc_init() and support functions
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*---------------------------------------------------------------------------*/
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static int scc_init_drivers(void)
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{
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int error;
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scc_driver = alloc_tty_driver(2);
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if (!scc_driver)
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return -ENOMEM;
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scc_driver->owner = THIS_MODULE;
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scc_driver->driver_name = "scc";
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scc_driver->name = "ttyS";
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scc_driver->major = TTY_MAJOR;
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scc_driver->minor_start = SCC_MINOR_BASE;
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scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
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scc_driver->subtype = SERIAL_TYPE_NORMAL;
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scc_driver->init_termios = tty_std_termios;
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scc_driver->init_termios.c_cflag =
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B9600 | CS8 | CREAD | HUPCL | CLOCAL;
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scc_driver->init_termios.c_ispeed = 9600;
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scc_driver->init_termios.c_ospeed = 9600;
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scc_driver->flags = TTY_DRIVER_REAL_RAW;
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tty_set_operations(scc_driver, &scc_ops);
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if ((error = tty_register_driver(scc_driver))) {
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printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
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error);
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put_tty_driver(scc_driver);
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return 1;
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}
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return 0;
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}
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/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
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*/
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static void scc_init_portstructs(void)
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{
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struct scc_port *port;
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int i;
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for (i = 0; i < 2; i++) {
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port = scc_ports + i;
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tty_port_init(&port->gs.port);
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port->gs.port.ops = &scc_port_ops;
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port->gs.magic = SCC_MAGIC;
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port->gs.close_delay = HZ/2;
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port->gs.closing_wait = 30 * HZ;
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port->gs.rd = &scc_real_driver;
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#ifdef NEW_WRITE_LOCKING
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port->gs.port_write_mutex = MUTEX;
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#endif
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init_waitqueue_head(&port->gs.port.open_wait);
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init_waitqueue_head(&port->gs.port.close_wait);
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}
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}
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#ifdef CONFIG_MVME147_SCC
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static int mvme147_scc_init(void)
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{
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struct scc_port *port;
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int error;
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printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
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/* Init channel A */
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port = &scc_ports[0];
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port->channel = CHANNEL_A;
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port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
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port->datap = port->ctrlp + 1;
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port->port_a = &scc_ports[0];
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port->port_b = &scc_ports[1];
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error = request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
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"SCC-A TX", port);
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if (error)
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goto fail;
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error = request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
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"SCC-A status", port);
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if (error)
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goto fail_free_a_tx;
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error = request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
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"SCC-A RX", port);
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if (error)
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goto fail_free_a_stat;
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error = request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int,
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IRQF_DISABLED, "SCC-A special cond", port);
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if (error)
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goto fail_free_a_rx;
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{
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SCC_ACCESS_INIT(port);
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/* disable interrupts for this channel */
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SCCwrite(INT_AND_DMA_REG, 0);
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/* Set the interrupt vector */
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SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
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/* Interrupt parameters: vector includes status, status low */
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SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
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SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
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}
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/* Init channel B */
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port = &scc_ports[1];
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port->channel = CHANNEL_B;
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port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
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port->datap = port->ctrlp + 1;
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port->port_a = &scc_ports[0];
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port->port_b = &scc_ports[1];
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error = request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
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"SCC-B TX", port);
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if (error)
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goto fail_free_a_spcond;
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error = request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
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"SCC-B status", port);
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if (error)
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goto fail_free_b_tx;
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error = request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
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"SCC-B RX", port);
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if (error)
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goto fail_free_b_stat;
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error = request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int,
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IRQF_DISABLED, "SCC-B special cond", port);
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if (error)
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goto fail_free_b_rx;
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{
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SCC_ACCESS_INIT(port);
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/* disable interrupts for this channel */
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SCCwrite(INT_AND_DMA_REG, 0);
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}
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/* Ensure interrupts are enabled in the PCC chip */
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m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
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/* Initialise the tty driver structures and register */
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scc_init_portstructs();
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scc_init_drivers();
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return 0;
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fail_free_b_rx:
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free_irq(MVME147_IRQ_SCCB_RX, port);
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fail_free_b_stat:
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free_irq(MVME147_IRQ_SCCB_STAT, port);
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fail_free_b_tx:
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free_irq(MVME147_IRQ_SCCB_TX, port);
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fail_free_a_spcond:
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free_irq(MVME147_IRQ_SCCA_SPCOND, port);
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fail_free_a_rx:
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free_irq(MVME147_IRQ_SCCA_RX, port);
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fail_free_a_stat:
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free_irq(MVME147_IRQ_SCCA_STAT, port);
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fail_free_a_tx:
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free_irq(MVME147_IRQ_SCCA_TX, port);
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fail:
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return error;
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}
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#endif
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#ifdef CONFIG_MVME162_SCC
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static int mvme162_scc_init(void)
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{
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struct scc_port *port;
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int error;
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if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
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return (-ENODEV);
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printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
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/* Init channel A */
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port = &scc_ports[0];
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port->channel = CHANNEL_A;
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port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
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port->datap = port->ctrlp + 2;
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port->port_a = &scc_ports[0];
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port->port_b = &scc_ports[1];
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error = request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
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"SCC-A TX", port);
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if (error)
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goto fail;
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error = request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
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"SCC-A status", port);
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if (error)
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goto fail_free_a_tx;
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error = request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
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"SCC-A RX", port);
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if (error)
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goto fail_free_a_stat;
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error = request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int,
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IRQF_DISABLED, "SCC-A special cond", port);
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if (error)
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goto fail_free_a_rx;
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{
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SCC_ACCESS_INIT(port);
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/* disable interrupts for this channel */
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SCCwrite(INT_AND_DMA_REG, 0);
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/* Set the interrupt vector */
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SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
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/* Interrupt parameters: vector includes status, status low */
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SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
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SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
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}
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/* Init channel B */
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port = &scc_ports[1];
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port->channel = CHANNEL_B;
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port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
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port->datap = port->ctrlp + 2;
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port->port_a = &scc_ports[0];
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port->port_b = &scc_ports[1];
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error = request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
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"SCC-B TX", port);
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if (error)
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goto fail_free_a_spcond;
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error = request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
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"SCC-B status", port);
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if (error)
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goto fail_free_b_tx;
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error = request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
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"SCC-B RX", port);
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if (error)
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goto fail_free_b_stat;
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error = request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int,
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IRQF_DISABLED, "SCC-B special cond", port);
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if (error)
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goto fail_free_b_rx;
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{
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SCC_ACCESS_INIT(port); /* Either channel will do */
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|
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/* disable interrupts for this channel */
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SCCwrite(INT_AND_DMA_REG, 0);
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}
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|
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/* Ensure interrupts are enabled in the MC2 chip */
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*(volatile char *)0xfff4201d = 0x14;
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|
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/* Initialise the tty driver structures and register */
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scc_init_portstructs();
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scc_init_drivers();
|
|
|
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return 0;
|
|
|
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fail_free_b_rx:
|
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free_irq(MVME162_IRQ_SCCB_RX, port);
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fail_free_b_stat:
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free_irq(MVME162_IRQ_SCCB_STAT, port);
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fail_free_b_tx:
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free_irq(MVME162_IRQ_SCCB_TX, port);
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fail_free_a_spcond:
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free_irq(MVME162_IRQ_SCCA_SPCOND, port);
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fail_free_a_rx:
|
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free_irq(MVME162_IRQ_SCCA_RX, port);
|
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fail_free_a_stat:
|
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free_irq(MVME162_IRQ_SCCA_STAT, port);
|
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fail_free_a_tx:
|
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free_irq(MVME162_IRQ_SCCA_TX, port);
|
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fail:
|
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return error;
|
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}
|
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#endif
|
|
|
|
|
|
#ifdef CONFIG_BVME6000_SCC
|
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static int bvme6000_scc_init(void)
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|
{
|
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struct scc_port *port;
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int error;
|
|
|
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printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
|
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/* Init channel A */
|
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port = &scc_ports[0];
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port->channel = CHANNEL_A;
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port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
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port->datap = port->ctrlp + 4;
|
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port->port_a = &scc_ports[0];
|
|
port->port_b = &scc_ports[1];
|
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error = request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
|
|
"SCC-A TX", port);
|
|
if (error)
|
|
goto fail;
|
|
error = request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
|
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"SCC-A status", port);
|
|
if (error)
|
|
goto fail_free_a_tx;
|
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error = request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
|
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"SCC-A RX", port);
|
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if (error)
|
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goto fail_free_a_stat;
|
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error = request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int,
|
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IRQF_DISABLED, "SCC-A special cond", port);
|
|
if (error)
|
|
goto fail_free_a_rx;
|
|
|
|
{
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
/* disable interrupts for this channel */
|
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SCCwrite(INT_AND_DMA_REG, 0);
|
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/* Set the interrupt vector */
|
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SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
|
|
/* Interrupt parameters: vector includes status, status low */
|
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SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
|
|
SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
|
|
}
|
|
|
|
/* Init channel B */
|
|
port = &scc_ports[1];
|
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port->channel = CHANNEL_B;
|
|
port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
|
|
port->datap = port->ctrlp + 4;
|
|
port->port_a = &scc_ports[0];
|
|
port->port_b = &scc_ports[1];
|
|
error = request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
|
|
"SCC-B TX", port);
|
|
if (error)
|
|
goto fail_free_a_spcond;
|
|
error = request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
|
|
"SCC-B status", port);
|
|
if (error)
|
|
goto fail_free_b_tx;
|
|
error = request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
|
|
"SCC-B RX", port);
|
|
if (error)
|
|
goto fail_free_b_stat;
|
|
error = request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int,
|
|
IRQF_DISABLED, "SCC-B special cond", port);
|
|
if (error)
|
|
goto fail_free_b_rx;
|
|
|
|
{
|
|
SCC_ACCESS_INIT(port); /* Either channel will do */
|
|
|
|
/* disable interrupts for this channel */
|
|
SCCwrite(INT_AND_DMA_REG, 0);
|
|
}
|
|
|
|
/* Initialise the tty driver structures and register */
|
|
scc_init_portstructs();
|
|
scc_init_drivers();
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
free_irq(BVME_IRQ_SCCA_STAT, port);
|
|
fail_free_a_tx:
|
|
free_irq(BVME_IRQ_SCCA_RX, port);
|
|
fail_free_a_stat:
|
|
free_irq(BVME_IRQ_SCCA_SPCOND, port);
|
|
fail_free_a_rx:
|
|
free_irq(BVME_IRQ_SCCB_TX, port);
|
|
fail_free_a_spcond:
|
|
free_irq(BVME_IRQ_SCCB_STAT, port);
|
|
fail_free_b_tx:
|
|
free_irq(BVME_IRQ_SCCB_RX, port);
|
|
fail_free_b_stat:
|
|
free_irq(BVME_IRQ_SCCB_SPCOND, port);
|
|
fail_free_b_rx:
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
|
|
static int vme_scc_init(void)
|
|
{
|
|
int res = -ENODEV;
|
|
|
|
#ifdef CONFIG_MVME147_SCC
|
|
if (MACH_IS_MVME147)
|
|
res = mvme147_scc_init();
|
|
#endif
|
|
#ifdef CONFIG_MVME162_SCC
|
|
if (MACH_IS_MVME16x)
|
|
res = mvme162_scc_init();
|
|
#endif
|
|
#ifdef CONFIG_BVME6000_SCC
|
|
if (MACH_IS_BVME6000)
|
|
res = bvme6000_scc_init();
|
|
#endif
|
|
return res;
|
|
}
|
|
|
|
module_init(vme_scc_init);
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* Interrupt handlers
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
static irqreturn_t scc_rx_int(int irq, void *data)
|
|
{
|
|
unsigned char ch;
|
|
struct scc_port *port = data;
|
|
struct tty_struct *tty = port->gs.port.tty;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
ch = SCCread_NB(RX_DATA_REG);
|
|
if (!tty) {
|
|
printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
return IRQ_HANDLED;
|
|
}
|
|
tty_insert_flip_char(tty, ch, 0);
|
|
|
|
/* Check if another character is already ready; in that case, the
|
|
* spcond_int() function must be used, because this character may have an
|
|
* error condition that isn't signalled by the interrupt vector used!
|
|
*/
|
|
if (SCCread(INT_PENDING_REG) &
|
|
(port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
|
|
scc_spcond_int (irq, data);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
|
|
tty_flip_buffer_push(tty);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static irqreturn_t scc_spcond_int(int irq, void *data)
|
|
{
|
|
struct scc_port *port = data;
|
|
struct tty_struct *tty = port->gs.port.tty;
|
|
unsigned char stat, ch, err;
|
|
int int_pending_mask = port->channel == CHANNEL_A ?
|
|
IPR_A_RX : IPR_B_RX;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
if (!tty) {
|
|
printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
|
|
SCCwrite(COMMAND_REG, CR_ERROR_RESET);
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
return IRQ_HANDLED;
|
|
}
|
|
do {
|
|
stat = SCCread(SPCOND_STATUS_REG);
|
|
ch = SCCread_NB(RX_DATA_REG);
|
|
|
|
if (stat & SCSR_RX_OVERRUN)
|
|
err = TTY_OVERRUN;
|
|
else if (stat & SCSR_PARITY_ERR)
|
|
err = TTY_PARITY;
|
|
else if (stat & SCSR_CRC_FRAME_ERR)
|
|
err = TTY_FRAME;
|
|
else
|
|
err = 0;
|
|
|
|
tty_insert_flip_char(tty, ch, err);
|
|
|
|
/* ++TeSche: *All* errors have to be cleared manually,
|
|
* else the condition persists for the next chars
|
|
*/
|
|
if (err)
|
|
SCCwrite(COMMAND_REG, CR_ERROR_RESET);
|
|
|
|
} while(SCCread(INT_PENDING_REG) & int_pending_mask);
|
|
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
|
|
tty_flip_buffer_push(tty);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static irqreturn_t scc_tx_int(int irq, void *data)
|
|
{
|
|
struct scc_port *port = data;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
if (!port->gs.port.tty) {
|
|
printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
|
|
SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
|
|
SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
return IRQ_HANDLED;
|
|
}
|
|
while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
|
|
if (port->x_char) {
|
|
SCCwrite(TX_DATA_REG, port->x_char);
|
|
port->x_char = 0;
|
|
}
|
|
else if ((port->gs.xmit_cnt <= 0) ||
|
|
port->gs.port.tty->stopped ||
|
|
port->gs.port.tty->hw_stopped)
|
|
break;
|
|
else {
|
|
SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
|
|
port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
if (--port->gs.xmit_cnt <= 0)
|
|
break;
|
|
}
|
|
}
|
|
if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped ||
|
|
port->gs.port.tty->hw_stopped) {
|
|
/* disable tx interrupts */
|
|
SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
|
|
SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
|
|
port->gs.port.flags &= ~GS_TX_INTEN;
|
|
}
|
|
if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
|
|
tty_wakeup(port->gs.port.tty);
|
|
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static irqreturn_t scc_stat_int(int irq, void *data)
|
|
{
|
|
struct scc_port *port = data;
|
|
unsigned channel = port->channel;
|
|
unsigned char last_sr, sr, changed;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
last_sr = scc_last_status_reg[channel];
|
|
sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
|
|
changed = last_sr ^ sr;
|
|
|
|
if (changed & SR_DCD) {
|
|
port->c_dcd = !!(sr & SR_DCD);
|
|
if (!(port->gs.port.flags & ASYNC_CHECK_CD))
|
|
; /* Don't report DCD changes */
|
|
else if (port->c_dcd) {
|
|
wake_up_interruptible(&port->gs.port.open_wait);
|
|
}
|
|
else {
|
|
if (port->gs.port.tty)
|
|
tty_hangup (port->gs.port.tty);
|
|
}
|
|
}
|
|
SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
|
|
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* generic_serial.c callback funtions
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
static void scc_disable_tx_interrupts(void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
|
|
port->gs.port.flags &= ~GS_TX_INTEN;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static void scc_enable_tx_interrupts(void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
|
|
/* restart the transmitter */
|
|
scc_tx_int (0, port);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static void scc_disable_rx_interrupts(void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
SCCmod(INT_AND_DMA_REG,
|
|
~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static void scc_enable_rx_interrupts(void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
SCCmod(INT_AND_DMA_REG, 0xff,
|
|
IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static int scc_carrier_raised(struct tty_port *port)
|
|
{
|
|
struct scc_port *sc = container_of(port, struct scc_port, gs.port);
|
|
unsigned channel = sc->channel;
|
|
|
|
return !!(scc_last_status_reg[channel] & SR_DCD);
|
|
}
|
|
|
|
|
|
static void scc_shutdown_port(void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
|
|
port->gs.port.flags &= ~ GS_ACTIVE;
|
|
if (port->gs.port.tty && (port->gs.port.tty->termios->c_cflag & HUPCL)) {
|
|
scc_setsignals (port, 0, 0);
|
|
}
|
|
}
|
|
|
|
|
|
static int scc_set_real_termios (void *ptr)
|
|
{
|
|
/* the SCC has char sizes 5,7,6,8 in that order! */
|
|
static int chsize_map[4] = { 0, 2, 1, 3 };
|
|
unsigned cflag, baud, chsize, channel, brgval = 0;
|
|
unsigned long flags;
|
|
struct scc_port *port = ptr;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0;
|
|
|
|
channel = port->channel;
|
|
|
|
if (channel == CHANNEL_A)
|
|
return 0; /* Settings controlled by boot PROM */
|
|
|
|
cflag = port->gs.port.tty->termios->c_cflag;
|
|
baud = port->gs.baud;
|
|
chsize = (cflag & CSIZE) >> 4;
|
|
|
|
if (baud == 0) {
|
|
/* speed == 0 -> drop DTR */
|
|
local_irq_save(flags);
|
|
SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
|
|
(MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
|
|
(MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
|
|
printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
|
|
return 0;
|
|
}
|
|
|
|
if (cflag & CLOCAL)
|
|
port->gs.port.flags &= ~ASYNC_CHECK_CD;
|
|
else
|
|
port->gs.port.flags |= ASYNC_CHECK_CD;
|
|
|
|
#ifdef CONFIG_MVME147_SCC
|
|
if (MACH_IS_MVME147)
|
|
brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
|
|
#endif
|
|
#ifdef CONFIG_MVME162_SCC
|
|
if (MACH_IS_MVME16x)
|
|
brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
|
|
#endif
|
|
#ifdef CONFIG_BVME6000_SCC
|
|
if (MACH_IS_BVME6000)
|
|
brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
|
|
#endif
|
|
/* Now we have all parameters and can go to set them: */
|
|
local_irq_save(flags);
|
|
|
|
/* receiver's character size and auto-enables */
|
|
SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
|
|
(chsize_map[chsize] << 6) |
|
|
((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
|
|
/* parity and stop bits (both, Tx and Rx), clock mode never changes */
|
|
SCCmod (AUX1_CTRL_REG,
|
|
~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
|
|
((cflag & PARENB
|
|
? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
|
|
: A1CR_PARITY_NONE)
|
|
| (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
|
|
/* sender's character size, set DTR for valid baud rate */
|
|
SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
|
|
/* clock sources never change */
|
|
/* disable BRG before changing the value */
|
|
SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
|
|
/* BRG value */
|
|
SCCwrite(TIMER_LOW_REG, brgval & 0xff);
|
|
SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
|
|
/* BRG enable, and clock source never changes */
|
|
SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int scc_chars_in_buffer (void *ptr)
|
|
{
|
|
struct scc_port *port = ptr;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
|
|
}
|
|
|
|
|
|
/* Comment taken from sx.c (2.4.0):
|
|
I haven't the foggiest why the decrement use count has to happen
|
|
here. The whole linux serial drivers stuff needs to be redesigned.
|
|
My guess is that this is a hack to minimize the impact of a bug
|
|
elsewhere. Thinking about it some more. (try it sometime) Try
|
|
running minicom on a serial port that is driven by a modularized
|
|
driver. Have the modem hangup. Then remove the driver module. Then
|
|
exit minicom. I expect an "oops". -- REW */
|
|
|
|
static void scc_hungup(void *ptr)
|
|
{
|
|
scc_disable_tx_interrupts(ptr);
|
|
scc_disable_rx_interrupts(ptr);
|
|
}
|
|
|
|
|
|
static void scc_close(void *ptr)
|
|
{
|
|
scc_disable_tx_interrupts(ptr);
|
|
scc_disable_rx_interrupts(ptr);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* Internal support functions
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
static void scc_setsignals(struct scc_port *port, int dtr, int rts)
|
|
{
|
|
unsigned long flags;
|
|
unsigned char t;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
t = SCCread(TX_CTRL_REG);
|
|
if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
|
|
if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
|
|
SCCwrite(TX_CTRL_REG, t);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static void scc_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct scc_port *port = tty->driver_data;
|
|
|
|
port->x_char = ch;
|
|
if (ch)
|
|
scc_enable_tx_interrupts(port);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* Driver entrypoints referenced from above
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
static int scc_open (struct tty_struct * tty, struct file * filp)
|
|
{
|
|
int line = tty->index;
|
|
int retval;
|
|
struct scc_port *port = &scc_ports[line];
|
|
int i, channel = port->channel;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
|
|
static const struct {
|
|
unsigned reg, val;
|
|
} mvme_init_tab[] = {
|
|
/* Values for MVME162 and MVME147 */
|
|
/* no parity, 1 stop bit, async, 1:16 */
|
|
{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
|
|
/* parity error is special cond, ints disabled, no DMA */
|
|
{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
|
|
/* Rx 8 bits/char, no auto enable, Rx off */
|
|
{ RX_CTRL_REG, RCR_CHSIZE_8 },
|
|
/* DTR off, Tx 8 bits/char, RTS off, Tx off */
|
|
{ TX_CTRL_REG, TCR_CHSIZE_8 },
|
|
/* special features off */
|
|
{ AUX2_CTRL_REG, 0 },
|
|
{ CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
|
|
{ DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
|
|
/* Start Rx */
|
|
{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
|
|
/* Start Tx */
|
|
{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
|
|
/* Ext/Stat ints: DCD only */
|
|
{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
|
|
/* Reset Ext/Stat ints */
|
|
{ COMMAND_REG, CR_EXTSTAT_RESET },
|
|
/* ...again */
|
|
{ COMMAND_REG, CR_EXTSTAT_RESET },
|
|
};
|
|
#endif
|
|
#if defined(CONFIG_BVME6000_SCC)
|
|
static const struct {
|
|
unsigned reg, val;
|
|
} bvme_init_tab[] = {
|
|
/* Values for BVME6000 */
|
|
/* no parity, 1 stop bit, async, 1:16 */
|
|
{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
|
|
/* parity error is special cond, ints disabled, no DMA */
|
|
{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
|
|
/* Rx 8 bits/char, no auto enable, Rx off */
|
|
{ RX_CTRL_REG, RCR_CHSIZE_8 },
|
|
/* DTR off, Tx 8 bits/char, RTS off, Tx off */
|
|
{ TX_CTRL_REG, TCR_CHSIZE_8 },
|
|
/* special features off */
|
|
{ AUX2_CTRL_REG, 0 },
|
|
{ CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
|
|
{ DPLL_CTRL_REG, DCR_BRG_ENAB },
|
|
/* Start Rx */
|
|
{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
|
|
/* Start Tx */
|
|
{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
|
|
/* Ext/Stat ints: DCD only */
|
|
{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
|
|
/* Reset Ext/Stat ints */
|
|
{ COMMAND_REG, CR_EXTSTAT_RESET },
|
|
/* ...again */
|
|
{ COMMAND_REG, CR_EXTSTAT_RESET },
|
|
};
|
|
#endif
|
|
if (!(port->gs.port.flags & ASYNC_INITIALIZED)) {
|
|
local_irq_save(flags);
|
|
#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
|
|
if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
|
|
for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
|
|
SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
|
|
}
|
|
#endif
|
|
#if defined(CONFIG_BVME6000_SCC)
|
|
if (MACH_IS_BVME6000) {
|
|
for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
|
|
SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
|
|
}
|
|
#endif
|
|
|
|
/* remember status register for detection of DCD and CTS changes */
|
|
scc_last_status_reg[channel] = SCCread(STATUS_REG);
|
|
|
|
port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
|
|
scc_setsignals (port, 1,1);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
tty->driver_data = port;
|
|
port->gs.port.tty = tty;
|
|
port->gs.port.count++;
|
|
retval = gs_init_port(&port->gs);
|
|
if (retval) {
|
|
port->gs.port.count--;
|
|
return retval;
|
|
}
|
|
port->gs.port.flags |= GS_ACTIVE;
|
|
retval = gs_block_til_ready(port, filp);
|
|
|
|
if (retval) {
|
|
port->gs.port.count--;
|
|
return retval;
|
|
}
|
|
|
|
port->c_dcd = tty_port_carrier_raised(&port->gs.port);
|
|
|
|
scc_enable_rx_interrupts(port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void scc_throttle (struct tty_struct * tty)
|
|
{
|
|
struct scc_port *port = tty->driver_data;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
|
local_irq_save(flags);
|
|
SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
|
|
local_irq_restore(flags);
|
|
}
|
|
if (I_IXOFF(tty))
|
|
scc_send_xchar(tty, STOP_CHAR(tty));
|
|
}
|
|
|
|
|
|
static void scc_unthrottle (struct tty_struct * tty)
|
|
{
|
|
struct scc_port *port = tty->driver_data;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
|
local_irq_save(flags);
|
|
SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
|
|
local_irq_restore(flags);
|
|
}
|
|
if (I_IXOFF(tty))
|
|
scc_send_xchar(tty, START_CHAR(tty));
|
|
}
|
|
|
|
|
|
static int scc_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
|
|
static int scc_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct scc_port *port = tty->driver_data;
|
|
unsigned long flags;
|
|
SCC_ACCESS_INIT(port);
|
|
|
|
local_irq_save(flags);
|
|
SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
|
|
break_state ? TCR_SEND_BREAK : 0);
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* Serial console stuff...
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
|
|
|
|
static void scc_ch_write (char ch)
|
|
{
|
|
volatile char *p = NULL;
|
|
|
|
#ifdef CONFIG_MVME147_SCC
|
|
if (MACH_IS_MVME147)
|
|
p = (volatile char *)M147_SCC_A_ADDR;
|
|
#endif
|
|
#ifdef CONFIG_MVME162_SCC
|
|
if (MACH_IS_MVME16x)
|
|
p = (volatile char *)MVME_SCC_A_ADDR;
|
|
#endif
|
|
#ifdef CONFIG_BVME6000_SCC
|
|
if (MACH_IS_BVME6000)
|
|
p = (volatile char *)BVME_SCC_A_ADDR;
|
|
#endif
|
|
|
|
do {
|
|
scc_delay();
|
|
}
|
|
while (!(*p & 4));
|
|
scc_delay();
|
|
*p = 8;
|
|
scc_delay();
|
|
*p = ch;
|
|
}
|
|
|
|
/* The console must be locked when we get here. */
|
|
|
|
static void scc_console_write (struct console *co, const char *str, unsigned count)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
while (count--)
|
|
{
|
|
if (*str == '\n')
|
|
scc_ch_write ('\r');
|
|
scc_ch_write (*str++);
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static struct tty_driver *scc_console_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return scc_driver;
|
|
}
|
|
|
|
static struct console sercons = {
|
|
.name = "ttyS",
|
|
.write = scc_console_write,
|
|
.device = scc_console_device,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
|
|
static int __init vme_scc_console_init(void)
|
|
{
|
|
if (vme_brdtype == VME_TYPE_MVME147 ||
|
|
vme_brdtype == VME_TYPE_MVME162 ||
|
|
vme_brdtype == VME_TYPE_MVME172 ||
|
|
vme_brdtype == VME_TYPE_BVME4000 ||
|
|
vme_brdtype == VME_TYPE_BVME6000)
|
|
register_console(&sercons);
|
|
return 0;
|
|
}
|
|
console_initcall(vme_scc_console_init);
|