patch-2.1.97 linux/arch/ppc/8xx_io/uart.c
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- Lines: 2531
- Date:
Tue Apr 14 17:33:40 1998
- Orig file:
v2.1.96/linux/arch/ppc/8xx_io/uart.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.96/linux/arch/ppc/8xx_io/uart.c linux/arch/ppc/8xx_io/uart.c
@@ -0,0 +1,2530 @@
+/*
+ * UART driver for MPC860 CPM SCC or SMC
+ * Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
+ *
+ * I used the serial.c driver as the framework for this driver.
+ * Give credit to those guys.
+ * The original code was written for the MBX860 board. I tried to make
+ * it generic, but there may be some assumptions in the structures that
+ * have to be fixed later.
+ * To save porting time, I did not bother to change any object names
+ * that are not accessed outside of this file.
+ * It still needs lots of work........When it was easy, I included code
+ * to support the SCCs, but this has never been tested, nor is it complete.
+ * Only the SCCs support modem control, so that is not complete either.
+ *
+ * This module exports the following rs232 io functions:
+ *
+ * int rs_8xx_init(void);
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+
+#include "commproc.h"
+
+#ifdef CONFIG_SERIAL_CONSOLE
+#include <linux/console.h>
+
+/* this defines the index into rs_table for the port to use
+*/
+#ifndef CONFIG_SERIAL_CONSOLE_PORT
+#define CONFIG_SERIAL_CONSOLE_PORT 0
+#endif
+#endif
+
+#define TX_WAKEUP ASYNC_SHARE_IRQ
+
+static char *serial_name = "CPM UART driver";
+static char *serial_version = "0.01";
+
+static DECLARE_TASK_QUEUE(tq_serial);
+
+static struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+/*
+ * Serial driver configuration section. Here are the various options:
+ */
+#define SERIAL_PARANOIA_CHECK
+#define CONFIG_SERIAL_NOPAUSE_IO
+#define SERIAL_DO_RESTART
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+#define _INLINE_ inline
+
+#define DBG_CNT(s)
+
+/* We overload some of the items in the data structure to meet our
+ * needs. For example, the port address is the CPM parameter ram
+ * offset for the SCC or SMC. The maximum number of ports is 4 SCCs and
+ * 2 SMCs. The "hub6" field is used to indicate the channel number, with
+ * 0 and 1 indicating the SMCs and 2, 3, 4, and 5 are the SCCs.
+ * Since these ports are so versatile, I don't yet have a strategy for
+ * their management. For example, SCC1 is used for Ethernet. Right
+ * now, just don't put them in the table. Of course, right now I just
+ * want the SMC to work as a uart :-)..
+ * The "type" field is currently set to 0, for PORT_UNKNOWN. It is
+ * not currently used. I should probably use it to indicate the port
+ * type of CMS or SCC.
+ * The SMCs do not support any modem control signals.
+ */
+#define smc_scc_num hub6
+#define SCC_NUM_BASE 2
+
+static struct serial_state rs_table[] = {
+ /* UART CLK PORT IRQ FLAGS NUM */
+ { 0, 0, PROFF_SMC1, CPMVEC_SMC1, 0, 0 }, /* SMC1 ttyS0 */
+ { 0, 0, PROFF_SMC2, CPMVEC_SMC2, 0, 1 }, /* SMC1 ttyS0 */
+};
+
+#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
+
+static struct tty_struct *serial_table[NR_PORTS];
+static struct termios *serial_termios[NR_PORTS];
+static struct termios *serial_termios_locked[NR_PORTS];
+
+/* The number of buffer descriptors and their sizes.
+*/
+#define RX_NUM_FIFO 4
+#define RX_BUF_SIZE 32
+#define TX_NUM_FIFO 4
+#define TX_BUF_SIZE 32
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+/* The async_struct in serial.h does not really give us what we
+ * need, so define our own here.
+ */
+typedef struct serial_info {
+ int magic;
+ int flags;
+ struct serial_state *state;
+ struct tty_struct *tty;
+ int read_status_mask;
+ int ignore_status_mask;
+ int timeout;
+ int line;
+ int x_char; /* xon/xoff character */
+ int close_delay;
+ unsigned short closing_wait;
+ unsigned short closing_wait2;
+ unsigned long event;
+ unsigned long last_active;
+ int blocked_open; /* # of blocked opens */
+ long session; /* Session of opening process */
+ long pgrp; /* pgrp of opening process */
+ struct tq_struct tqueue;
+ struct tq_struct tqueue_hangup;
+ struct wait_queue *open_wait;
+ struct wait_queue *close_wait;
+
+ /* CPM Buffer Descriptor pointers.
+ */
+ cbd_t *rx_bd_base;
+ cbd_t *rx_cur;
+ cbd_t *tx_bd_base;
+ cbd_t *tx_cur;
+} ser_info_t;
+
+static void change_speed(ser_info_t *info);
+static void rs_8xx_wait_until_sent(struct tty_struct *tty, int timeout);
+
+static inline int serial_paranoia_check(ser_info_t *info,
+ kdev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char *badmagic =
+ "Warning: bad magic number for serial struct (%s) in %s\n";
+ static const char *badinfo =
+ "Warning: null async_struct for (%s) in %s\n";
+
+ if (!info) {
+ printk(badinfo, kdevname(device), routine);
+ return 1;
+ }
+ if (info->magic != SERIAL_MAGIC) {
+ printk(badmagic, kdevname(device), routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts,
+ * indexed by the termio value. The generic CPM functions are responsible
+ * for setting and assigning baud rate generators for us.
+ */
+static int baud_table[] = {
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+ 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0 };
+
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_8xx_stop(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ int idx;
+ unsigned long flags;
+ volatile scc_t *sccp;
+ volatile smc_t *smcp;
+
+ if (serial_paranoia_check(info, tty->device, "rs_stop"))
+ return;
+
+ save_flags(flags); cli();
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+ smcp->smc_smcm &= ~SMCM_TX;
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm &= ~UART_SCCM_TX;
+ }
+ restore_flags(flags);
+}
+
+static void rs_8xx_start(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ int idx;
+ unsigned long flags;
+ volatile scc_t *sccp;
+ volatile smc_t *smcp;
+
+ if (serial_paranoia_check(info, tty->device, "rs_stop"))
+ return;
+
+ save_flags(flags); cli();
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+ smcp->smc_smcm |= SMCM_TX;
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm |= UART_SCCM_TX;
+ }
+ restore_flags(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static _INLINE_ void rs_sched_event(ser_info_t *info,
+ int event)
+{
+ info->event |= 1 << event;
+ queue_task(&info->tqueue, &tq_serial);
+ mark_bh(SERIAL_BH);
+}
+
+static _INLINE_ void receive_chars(ser_info_t *info)
+{
+ struct tty_struct *tty = info->tty;
+ unsigned char ch, *cp;
+ int ignored = 0;
+ int i;
+ ushort status;
+ struct async_icount *icount;
+ volatile cbd_t *bdp;
+
+ icount = &info->state->icount;
+
+ /* Just loop through the closed BDs and copy the characters into
+ * the buffer.
+ */
+ bdp = info->rx_cur;
+ for (;;) {
+ if (bdp->cbd_sc & BD_SC_EMPTY) /* If this one is empty */
+ break; /* we are all done */
+
+ /* The read status mask tell us what we should do with
+ * incoming characters, especially if errors occur.
+ * One special case is the use of BD_SC_EMPTY. If
+ * this is not set, we are supposed to be ignoring
+ * inputs. In this case, just mark the buffer empty and
+ * continue.
+ if (!(info->read_status_mask & BD_SC_EMPTY)) {
+ bdp->cbd_sc |= BD_SC_EMPTY;
+ bdp->cbd_sc &=
+ ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
+
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = info->rx_bd_base;
+ else
+ bdp++;
+ continue;
+ }
+ */
+
+ /* Get the number of characters and the buffer pointer.
+ */
+ i = bdp->cbd_datlen;
+ cp = (unsigned char *)__va(bdp->cbd_bufaddr);
+ status = bdp->cbd_sc;
+
+ /* Check to see if there is room in the tty buffer for
+ * the characters in our BD buffer. If not, we exit
+ * now, leaving the BD with the characters. We'll pick
+ * them up again on the next receive interrupt (which could
+ * be a timeout).
+ */
+ if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE)
+ break;
+
+ while (i-- > 0) {
+ ch = *cp++;
+ *tty->flip.char_buf_ptr = ch;
+ icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("DR%02x:%02x...", ch, *status);
+#endif
+ *tty->flip.flag_buf_ptr = 0;
+ if (status & (BD_SC_BR | BD_SC_FR |
+ BD_SC_PR | BD_SC_OV)) {
+ /*
+ * For statistics only
+ */
+ if (status & BD_SC_BR)
+ icount->brk++;
+ else if (status & BD_SC_PR)
+ icount->parity++;
+ else if (status & BD_SC_FR)
+ icount->frame++;
+ if (status & BD_SC_OV)
+ icount->overrun++;
+
+ /*
+ * Now check to see if character should be
+ * ignored, and mask off conditions which
+ * should be ignored.
+ if (status & info->ignore_status_mask) {
+ if (++ignored > 100)
+ break;
+ continue;
+ }
+ */
+ status &= info->read_status_mask;
+
+ if (status & (BD_SC_BR)) {
+#ifdef SERIAL_DEBUG_INTR
+ printk("handling break....");
+#endif
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ if (info->flags & ASYNC_SAK)
+ do_SAK(tty);
+ } else if (status & BD_SC_PR)
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ else if (status & BD_SC_FR)
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ if (status & BD_SC_OV) {
+ /*
+ * Overrun is special, since it's
+ * reported immediately, and doesn't
+ * affect the current character
+ */
+ if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+ tty->flip.count++;
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ *tty->flip.flag_buf_ptr =
+ TTY_OVERRUN;
+ }
+ }
+ }
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ break;
+
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ }
+
+ /* This BD is ready to be used again. Clear status.
+ * Get next BD.
+ */
+ bdp->cbd_sc |= BD_SC_EMPTY;
+ bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
+
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = info->rx_bd_base;
+ else
+ bdp++;
+ }
+
+ info->rx_cur = (cbd_t *)bdp;
+
+ queue_task(&tty->flip.tqueue, &tq_timer);
+}
+
+static _INLINE_ void transmit_chars(ser_info_t *info)
+{
+
+ if (info->flags & TX_WAKEUP) {
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+ }
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("THRE...");
+#endif
+}
+
+#ifdef notdef
+ /* I need to do this for the SCCs, so it is left as a reminder.
+ */
+static _INLINE_ void check_modem_status(struct async_struct *info)
+{
+ int status;
+ struct async_icount *icount;
+
+ status = serial_in(info, UART_MSR);
+
+ if (status & UART_MSR_ANY_DELTA) {
+ icount = &info->state->icount;
+ /* update input line counters */
+ if (status & UART_MSR_TERI)
+ icount->rng++;
+ if (status & UART_MSR_DDSR)
+ icount->dsr++;
+ if (status & UART_MSR_DDCD) {
+ icount->dcd++;
+#ifdef CONFIG_HARD_PPS
+ if ((info->flags & ASYNC_HARDPPS_CD) &&
+ (status & UART_MSR_DCD))
+ hardpps();
+#endif
+ }
+ if (status & UART_MSR_DCTS)
+ icount->cts++;
+ wake_up_interruptible(&info->delta_msr_wait);
+ }
+
+ if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
+#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
+ printk("ttys%d CD now %s...", info->line,
+ (status & UART_MSR_DCD) ? "on" : "off");
+#endif
+ if (status & UART_MSR_DCD)
+ wake_up_interruptible(&info->open_wait);
+ else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_CALLOUT_NOHUP))) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("scheduling hangup...");
+#endif
+ queue_task(&info->tqueue_hangup,
+ &tq_scheduler);
+ }
+ }
+ if (info->flags & ASYNC_CTS_FLOW) {
+ if (info->tty->hw_stopped) {
+ if (status & UART_MSR_CTS) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+ printk("CTS tx start...");
+#endif
+ info->tty->hw_stopped = 0;
+ info->IER |= UART_IER_THRI;
+ serial_out(info, UART_IER, info->IER);
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+ return;
+ }
+ } else {
+ if (!(status & UART_MSR_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+ printk("CTS tx stop...");
+#endif
+ info->tty->hw_stopped = 1;
+ info->IER &= ~UART_IER_THRI;
+ serial_out(info, UART_IER, info->IER);
+ }
+ }
+ }
+}
+#endif
+
+/*
+ * This is the serial driver's interrupt routine for a single port
+ */
+static void rs_8xx_interrupt(void *dev_id)
+{
+ u_char events;
+ int idx;
+ ser_info_t *info;
+ volatile smc_t *smcp;
+
+ info = (ser_info_t *)dev_id;
+
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+ }
+ else {
+ panic("SCC UART Interrupt....not ready");
+ }
+
+ events = smcp->smc_smce;
+#ifdef SERIAL_DEBUG_INTR
+ printk("rs_interrupt_single(%d, %x)...",
+ info->state->smc_scc_num, events);
+#endif
+ if (events & SMCM_RX)
+ receive_chars(info);
+ if (events & SMCM_TX)
+ transmit_chars(info);
+ smcp->smc_smce = events;
+#ifdef modem_control
+ check_modem_status(info);
+#endif
+ info->last_active = jiffies;
+#ifdef SERIAL_DEBUG_INTR
+ printk("end.\n");
+#endif
+}
+
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh(void)
+{
+ run_task_queue(&tq_serial);
+}
+
+static void do_softint(void *private_)
+{
+ ser_info_t *info = (ser_info_t *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+ wake_up_interruptible(&tty->write_wait);
+ }
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ *
+ */
+static void do_serial_hangup(void *private_)
+{
+ struct async_struct *info = (struct async_struct *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ tty_hangup(tty);
+}
+
+static void rs_8xx_timer(void)
+{
+ printk("rs_8xx_timer\n");
+}
+
+
+static int startup(ser_info_t *info)
+{
+ unsigned long flags;
+ int retval=0;
+ int idx;
+ struct serial_state *state= info->state;
+ volatile smc_t *smcp;
+ volatile scc_t *sccp;
+ volatile smc_uart_t *up;
+
+
+ save_flags(flags); cli();
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ goto errout;
+ }
+
+#ifdef maybe
+ if (!state->port || !state->type) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+ goto errout;
+ }
+#endif
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttys%d (irq %d)...", info->line, state->irq);
+#endif
+
+
+#ifdef modem_control
+ info->MCR = 0;
+ if (info->tty->termios->c_cflag & CBAUD)
+ info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+#endif
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ /*
+ * and set the speed of the serial port
+ */
+ change_speed(info);
+
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+
+ /* Enable interrupts and I/O.
+ */
+ smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
+ smcp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
+
+ /* We can tune the buffer length and idle characters
+ * to take advantage of the entire incoming buffer size.
+ * If mrblr is something other than 1, maxidl has to be
+ * non-zero or we never get an interrupt. The maxidl
+ * is the number of character times we wait after reception
+ * of the last character before we decide no more characters
+ * are coming.
+ */
+ up = (smc_uart_t *)&cpmp->cp_dparam[state->port];
+ up->smc_mrblr = 1; /* receive buffer length */
+ up->smc_maxidl = 0; /* wait forever for next char */
+ up->smc_brkcr = 1; /* number of break chars */
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm |= UART_SCCM_RX;
+ }
+
+ info->flags |= ASYNC_INITIALIZED;
+ restore_flags(flags);
+ return 0;
+
+errout:
+ restore_flags(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(ser_info_t * info)
+{
+ unsigned long flags;
+ struct serial_state *state;
+ int idx;
+ volatile smc_t *smcp;
+ volatile scc_t *sccp;
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+ state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....", info->line,
+ state->irq);
+#endif
+
+ save_flags(flags); cli(); /* Disable interrupts */
+
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+
+ /* Disable interrupts and I/O.
+ */
+ smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
+#ifdef CONFIG_SERIAL_CONSOLE
+ /* We can't disable the transmitter if this is the
+ * system console.
+ */
+ if (idx != CONFIG_SERIAL_CONSOLE_PORT)
+#endif
+ smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm &= ~UART_SCCM_RX;
+ }
+
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ASYNC_INITIALIZED;
+ restore_flags(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(ser_info_t *info)
+{
+ int baud_rate;
+ unsigned cflag, cval, prev_mode;
+ int i, bits, idx;
+ unsigned long flags;
+ volatile smc_t *smcp;
+ volatile scc_t *sccp;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+
+ /* Character length programmed into the mode register is the
+ * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
+ * 1 or 2 stop bits, minus 1.
+ * The value 'bits' counts this for us.
+ */
+ cval = 0;
+
+ /* byte size and parity */
+ switch (cflag & CSIZE) {
+ case CS5: bits = 5; break;
+ case CS6: bits = 6; break;
+ case CS7: bits = 7; break;
+ case CS8: bits = 8; break;
+ /* Never happens, but GCC is too dumb to figure it out */
+ default: bits = 8; break;
+ }
+ if (cflag & CSTOPB) {
+ cval |= SMCMR_SL; /* Two stops */
+ bits++;
+ }
+ if (cflag & PARENB) {
+ cval |= SMCMR_PEN;
+ bits++;
+ }
+ if (!(cflag & PARODD))
+ cval |= SMCMR_PM_EVEN;
+
+ /* Determine divisor based on baud rate */
+ i = cflag & CBAUD;
+ if (i & CBAUDEX) {
+ i &= ~CBAUDEX;
+ if (i < 1 || i > 4)
+ info->tty->termios->c_cflag &= ~CBAUDEX;
+ else
+ i += 15;
+ }
+
+ baud_rate = baud_table[i];
+
+ info->timeout = (TX_BUF_SIZE*HZ*bits);
+ info->timeout += HZ/50; /* Add .02 seconds of slop */
+
+#ifdef modem_control
+ /* CTS flow control flag and modem status interrupts */
+ info->IER &= ~UART_IER_MSI;
+ if (info->flags & ASYNC_HARDPPS_CD)
+ info->IER |= UART_IER_MSI;
+ if (cflag & CRTSCTS) {
+ info->flags |= ASYNC_CTS_FLOW;
+ info->IER |= UART_IER_MSI;
+ } else
+ info->flags &= ~ASYNC_CTS_FLOW;
+ if (cflag & CLOCAL)
+ info->flags &= ~ASYNC_CHECK_CD;
+ else {
+ info->flags |= ASYNC_CHECK_CD;
+ info->IER |= UART_IER_MSI;
+ }
+ serial_out(info, UART_IER, info->IER);
+#endif
+
+ /*
+ * Set up parity check flag
+ */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+ info->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
+ if (I_INPCK(info->tty))
+ info->read_status_mask |= BD_SC_FR | BD_SC_PR;
+ if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+ info->read_status_mask |= BD_SC_BR;
+
+ /*
+ * Characters to ignore
+ */
+ info->ignore_status_mask = 0;
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
+ if (I_IGNBRK(info->tty)) {
+ info->ignore_status_mask |= BD_SC_BR;
+ /*
+ * If we're ignore parity and break indicators, ignore
+ * overruns too. (For real raw support).
+ */
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= BD_SC_OV;
+ }
+ /*
+ * !!! ignore all characters if CREAD is not set
+ */
+ if ((cflag & CREAD) == 0)
+ info->read_status_mask &= ~BD_SC_EMPTY;
+ save_flags(flags); cli();
+
+ /* Start bit has not been added (so don't, because we would just
+ * subtract it later), and we need to add one for the number of
+ * stops bits (there is always at least one).
+ */
+ bits++;
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+
+ /* Set the mode register. We want to keep a copy of the
+ * enables, because we want to put them back if they were
+ * present.
+ */
+ prev_mode = smcp->smc_smcmr;
+ smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART;
+ smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm &= ~UART_SCCM_RX;
+ }
+
+ mbx_cpm_setbrg(info->state->smc_scc_num, baud_rate);
+
+ restore_flags(flags);
+}
+
+static void rs_8xx_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ volatile cbd_t *bdp;
+
+ if (serial_paranoia_check(info, tty->device, "rs_put_char"))
+ return;
+
+ if (!tty)
+ return;
+
+ bdp = info->tx_cur;
+ while (bdp->cbd_sc & BD_SC_READY);
+
+ *((char *)__va(bdp->cbd_bufaddr)) = ch;
+ bdp->cbd_datlen = 1;
+ bdp->cbd_sc |= BD_SC_READY;
+
+ /* Get next BD.
+ */
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = info->tx_bd_base;
+ else
+ bdp++;
+
+ info->tx_cur = (cbd_t *)bdp;
+
+}
+
+static int rs_8xx_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ int c, ret = 0;
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ volatile cbd_t *bdp;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write"))
+ return 0;
+
+ if (!tty)
+ return 0;
+
+ bdp = info->tx_cur;
+
+ while (1) {
+ c = MIN(count, TX_BUF_SIZE);
+
+ if (c <= 0)
+ break;
+
+ if (bdp->cbd_sc & BD_SC_READY) {
+ info->flags |= TX_WAKEUP;
+ break;
+ }
+
+ if (from_user) {
+ if (c !=
+ copy_from_user(__va(bdp->cbd_bufaddr), buf, c)) {
+ if (!ret)
+ ret = -EFAULT;
+ break;
+ }
+ } else {
+ memcpy(__va(bdp->cbd_bufaddr), buf, c);
+ }
+
+ bdp->cbd_datlen = c;
+ bdp->cbd_sc |= BD_SC_READY;
+
+ buf += c;
+ count -= c;
+ ret += c;
+
+ /* Get next BD.
+ */
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = info->tx_bd_base;
+ else
+ bdp++;
+ info->tx_cur = (cbd_t *)bdp;
+ }
+ return ret;
+}
+
+static int rs_8xx_write_room(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ int ret;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write_room"))
+ return 0;
+
+ if ((info->tx_cur->cbd_sc & BD_SC_READY) == 0) {
+ info->flags &= ~TX_WAKEUP;
+ ret = TX_BUF_SIZE;
+ }
+ else {
+ info->flags |= TX_WAKEUP;
+ ret = 0;
+ }
+ return ret;
+}
+
+/* I could track this with transmit counters....maybe later.
+*/
+static int rs_8xx_chars_in_buffer(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
+ return 0;
+ return 0;
+}
+
+static void rs_8xx_flush_buffer(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+ return;
+
+ /* There is nothing to "flush", whatever we gave the CPM
+ * is on its way out.
+ */
+ wake_up_interruptible(&tty->write_wait);
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+ info->flags &= ~TX_WAKEUP;
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_8xx_send_xchar(struct tty_struct *tty, char ch)
+{
+ volatile cbd_t *bdp;
+
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_send_char"))
+ return;
+
+ bdp = info->tx_cur;
+ while (bdp->cbd_sc & BD_SC_READY);
+
+ *((char *)__va(bdp->cbd_bufaddr)) = ch;
+ bdp->cbd_datlen = 1;
+ bdp->cbd_sc |= BD_SC_READY;
+
+ /* Get next BD.
+ */
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = info->tx_bd_base;
+ else
+ bdp++;
+
+ info->tx_cur = (cbd_t *)bdp;
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_8xx_throttle(struct tty_struct * tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ rs_8xx_send_xchar(tty, STOP_CHAR(tty));
+
+#ifdef modem_control
+ if (tty->termios->c_cflag & CRTSCTS)
+ info->MCR &= ~UART_MCR_RTS;
+
+ cli();
+ serial_out(info, UART_MCR, info->MCR);
+ sti();
+#endif
+}
+
+static void rs_8xx_unthrottle(struct tty_struct * tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ rs_8xx_send_xchar(tty, START_CHAR(tty));
+ }
+#ifdef modem_control
+ if (tty->termios->c_cflag & CRTSCTS)
+ info->MCR |= UART_MCR_RTS;
+ cli();
+ serial_out(info, UART_MCR, info->MCR);
+ sti();
+#endif
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+#ifdef maybe
+/*
+ * 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 async_struct * info, unsigned int *value)
+{
+ unsigned char status;
+ unsigned int result;
+
+ cli();
+ status = serial_in(info, UART_LSR);
+ sti();
+ result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
+ return put_user(result,value);
+}
+#endif
+
+static int get_modem_info(ser_info_t *info, unsigned int *value)
+{
+ unsigned int result = 0;
+#ifdef modem_control
+ unsigned char control, status;
+
+ control = info->MCR;
+ cli();
+ status = serial_in(info, UART_MSR);
+ sti();
+ result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
+ | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
+#ifdef TIOCM_OUT1
+ | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
+ | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
+#endif
+ | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
+ | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
+ | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
+ | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
+#endif
+ return put_user(result,value);
+}
+
+static int set_modem_info(ser_info_t *info, unsigned int cmd,
+ unsigned int *value)
+{
+ int error;
+ unsigned int arg;
+
+ error = get_user(arg, value);
+ if (error)
+ return error;
+#ifdef modem_control
+ switch (cmd) {
+ case TIOCMBIS:
+ if (arg & TIOCM_RTS)
+ info->MCR |= UART_MCR_RTS;
+ if (arg & TIOCM_DTR)
+ info->MCR |= UART_MCR_DTR;
+#ifdef TIOCM_OUT1
+ if (arg & TIOCM_OUT1)
+ info->MCR |= UART_MCR_OUT1;
+ if (arg & TIOCM_OUT2)
+ info->MCR |= UART_MCR_OUT2;
+#endif
+ break;
+ case TIOCMBIC:
+ if (arg & TIOCM_RTS)
+ info->MCR &= ~UART_MCR_RTS;
+ if (arg & TIOCM_DTR)
+ info->MCR &= ~UART_MCR_DTR;
+#ifdef TIOCM_OUT1
+ if (arg & TIOCM_OUT1)
+ info->MCR &= ~UART_MCR_OUT1;
+ if (arg & TIOCM_OUT2)
+ info->MCR &= ~UART_MCR_OUT2;
+#endif
+ break;
+ case TIOCMSET:
+ info->MCR = ((info->MCR & ~(UART_MCR_RTS |
+#ifdef TIOCM_OUT1
+ UART_MCR_OUT1 |
+ UART_MCR_OUT2 |
+#endif
+ UART_MCR_DTR))
+ | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
+#ifdef TIOCM_OUT1
+ | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
+ | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
+#endif
+ | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
+ break;
+ default:
+ return -EINVAL;
+ }
+ cli();
+ serial_out(info, UART_MCR, info->MCR);
+ sti();
+#endif
+ return 0;
+}
+
+/* Sending a break is a two step process on the SMC/SCC. It is accomplished
+ * by sending a STOP TRANSMIT command followed by a RESTART TRANSMIT
+ * command. We take advantage of the begin/end functions to make this
+ * happen.
+ */
+static void begin_break(ser_info_t *info)
+{
+ volatile cpm8xx_t *cp;
+ ushort chan;
+ ushort num;
+
+ cp = cpmp;
+
+ if ((num = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ if (num == 0)
+ chan = CPM_CR_CH_SMC1;
+ else
+ chan = CPM_CR_CH_SMC2;
+ }
+ else {
+ num -= SCC_NUM_BASE;
+ switch (num) {
+ case 0: chan = CPM_CR_CH_SCC1; break;
+ case 1: chan = CPM_CR_CH_SCC2; break;
+ case 2: chan = CPM_CR_CH_SCC3; break;
+ case 3: chan = CPM_CR_CH_SCC4; break;
+ default: return;
+ }
+ }
+ cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG;
+ while (cp->cp_cpcr & CPM_CR_FLG);
+}
+
+static void end_break(ser_info_t *info)
+{
+ volatile cpm8xx_t *cp;
+ ushort chan;
+ ushort num;
+
+ cp = cpmp;
+
+ if ((num = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ if (num == 0)
+ chan = CPM_CR_CH_SMC1;
+ else
+ chan = CPM_CR_CH_SMC2;
+ }
+ else {
+ num -= SCC_NUM_BASE;
+ switch (num) {
+ case 0: chan = CPM_CR_CH_SCC1; break;
+ case 1: chan = CPM_CR_CH_SCC2; break;
+ case 2: chan = CPM_CR_CH_SCC3; break;
+ case 3: chan = CPM_CR_CH_SCC4; break;
+ default: return;
+ }
+ }
+ cp->cp_cpcr = mk_cr_cmd(chan, CPM_CR_RESTART_TX) | CPM_CR_FLG;
+ while (cp->cp_cpcr & CPM_CR_FLG);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(ser_info_t *info, int duration)
+{
+ current->state = TASK_INTERRUPTIBLE;
+ current->timeout = jiffies + duration;
+#ifdef SERIAL_DEBUG_SEND_BREAK
+ printk("rs_send_break(%d) jiff=%lu...", duration, jiffies);
+#endif
+ begin_break(info);
+ schedule();
+ end_break(info);
+#ifdef SERIAL_DEBUG_SEND_BREAK
+ printk("done jiffies=%lu\n", jiffies);
+#endif
+}
+
+
+static int rs_8xx_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ int error;
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ int retval;
+ struct async_icount cnow; /* kernel counter temps */
+ struct serial_icounter_struct *p_cuser; /* user space */
+
+ if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TCSBRK: /* SVID version: non-zero arg --> no break */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ if (signal_pending(current))
+ return -EINTR;
+ if (!arg) {
+ send_break(info, HZ/4); /* 1/4 second */
+ if (signal_pending(current))
+ return -EINTR;
+ }
+ return 0;
+ case TCSBRKP: /* support for POSIX tcsendbreak() */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ if (signal_pending(current))
+ return -EINTR;
+ send_break(info, arg ? arg*(HZ/10) : HZ/4);
+ if (signal_pending(current))
+ return -EINTR;
+ return 0;
+ case TIOCSBRK:
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ begin_break(info);
+ return 0;
+ case TIOCCBRK:
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ end_break(info);
+ return 0;
+ case TIOCGSOFTCAR:
+ return put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg);
+ case TIOCSSOFTCAR:
+ error = get_user(arg, (unsigned int *) arg);
+ if (error)
+ return error;
+ tty->termios->c_cflag =
+ ((tty->termios->c_cflag & ~CLOCAL) |
+ (arg ? CLOCAL : 0));
+ return 0;
+ case TIOCMGET:
+ return get_modem_info(info, (unsigned int *) arg);
+ case TIOCMBIS:
+ case TIOCMBIC:
+ case TIOCMSET:
+ return set_modem_info(info, cmd, (unsigned int *) arg);
+#ifdef maybe
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, (unsigned int *) arg);
+#endif
+ /*
+ * 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:
+#ifdef modem_control
+ cli();
+ /* note the counters on entry */
+ cprev = info->state->icount;
+ sti();
+ while (1) {
+ interruptible_sleep_on(&info->delta_msr_wait);
+ /* see if a signal did it */
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ cli();
+ cnow = info->state->icount; /* atomic copy */
+ sti();
+ if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
+ cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
+ return -EIO; /* no change => error */
+ 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)) ) {
+ return 0;
+ }
+ cprev = cnow;
+ }
+ /* NOTREACHED */
+#else
+ return 0;
+#endif
+
+ /*
+ * 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.
+ */
+ case TIOCGICOUNT:
+ cli();
+ cnow = info->state->icount;
+ sti();
+ p_cuser = (struct serial_icounter_struct *) arg;
+ error = put_user(cnow.cts, &p_cuser->cts);
+ if (error) return error;
+ error = put_user(cnow.dsr, &p_cuser->dsr);
+ if (error) return error;
+ error = put_user(cnow.rng, &p_cuser->rng);
+ if (error) return error;
+ error = put_user(cnow.dcd, &p_cuser->dcd);
+ if (error) return error;
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+/* FIX UP modem control here someday......
+*/
+static void rs_8xx_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+ if ( (tty->termios->c_cflag == old_termios->c_cflag)
+ && ( RELEVANT_IFLAG(tty->termios->c_iflag)
+ == RELEVANT_IFLAG(old_termios->c_iflag)))
+ return;
+
+ change_speed(info);
+
+#ifdef modem_control
+ /* Handle transition to B0 status */
+ if ((old_termios->c_cflag & CBAUD) &&
+ !(tty->termios->c_cflag & CBAUD)) {
+ info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
+ cli();
+ serial_out(info, UART_MCR, info->MCR);
+ sti();
+ }
+
+ /* Handle transition away from B0 status */
+ if (!(old_termios->c_cflag & CBAUD) &&
+ (tty->termios->c_cflag & CBAUD)) {
+ info->MCR |= UART_MCR_DTR;
+ if (!tty->hw_stopped ||
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ info->MCR |= UART_MCR_RTS;
+ }
+ cli();
+ serial_out(info, UART_MCR, info->MCR);
+ sti();
+ }
+
+ /* Handle turning off CRTSCTS */
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_8xx_start(tty);
+ }
+#endif
+
+#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) &&
+ (tty->termios->c_cflag & CLOCAL))
+ 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_8xx_close(struct tty_struct *tty, struct file * filp)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ struct serial_state *state;
+ unsigned long flags;
+ int idx;
+ volatile smc_t *smcp;
+ volatile scc_t *sccp;
+
+ if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+ return;
+
+ state = info->state;
+
+ save_flags(flags); cli();
+
+ if (tty_hung_up_p(filp)) {
+ DBG_CNT("before DEC-hung");
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_close ttys%d, count = %d\n", info->line, state->count);
+#endif
+ if ((tty->count == 1) && (state->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. state->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk("rs_close: bad serial port count; tty->count is 1, "
+ "state->count is %d\n", state->count);
+ state->count = 1;
+ }
+ if (--state->count < 0) {
+ printk("rs_close: bad serial port count for ttys%d: %d\n",
+ info->line, state->count);
+ state->count = 0;
+ }
+ if (state->count) {
+ DBG_CNT("before DEC-2");
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+ return;
+ }
+ info->flags |= ASYNC_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ info->state->normal_termios = *tty->termios;
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ info->state->callout_termios = *tty->termios;
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+ if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, info->closing_wait);
+ /*
+ * 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.
+ */
+ info->read_status_mask &= ~BD_SC_EMPTY;
+ if (info->flags & ASYNC_INITIALIZED) {
+ if ((idx = info->state->smc_scc_num) < SCC_NUM_BASE) {
+ smcp = &cpmp->cp_smc[idx];
+ smcp->smc_smcm &= ~SMCM_RX;
+ smcp->smc_smcmr &= ~SMCMR_REN;
+ }
+ else {
+ sccp = &cpmp->cp_scc[idx - SCC_NUM_BASE];
+ sccp->scc_sccm &= ~UART_SCCM_RX;
+ }
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important if there is a transmit FIFO!
+ */
+ rs_8xx_wait_until_sent(tty, info->timeout);
+ }
+ shutdown(info);
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer(tty);
+ if (tty->ldisc.flush_buffer)
+ tty->ldisc.flush_buffer(tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ current->state = TASK_INTERRUPTIBLE;
+ current->timeout = jiffies + info->close_delay;
+ schedule();
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
+ ASYNC_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_8xx_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ unsigned long orig_jiffies, char_time;
+ int lsr;
+ volatile cbd_t *bdp;
+
+ if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
+ return;
+
+#ifdef maybe
+ if (info->state->type == PORT_UNKNOWN)
+ return;
+#endif
+
+ 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 = 1;
+ if (timeout)
+ char_time = MIN(char_time, 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
+
+ /* We go through the loop at least once because we can't tell
+ * exactly when the last character exits the shifter. There can
+ * be at least two characters waiting to be sent after the buffers
+ * are empty.
+ */
+ do {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+ current->state = TASK_INTERRUPTIBLE;
+/* current->counter = 0; /* make us low-priority */
+ current->timeout = jiffies + char_time;
+ schedule();
+ if (signal_pending(current))
+ break;
+ if (timeout && ((orig_jiffies + timeout) < jiffies))
+ break;
+ bdp = info->tx_cur;
+ } while (bdp->cbd_sc & BD_SC_READY);
+ 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_8xx_hangup(struct tty_struct *tty)
+{
+ ser_info_t *info = (ser_info_t *)tty->driver_data;
+ struct serial_state *state = info->state;
+
+ if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+ return;
+
+ state = info->state;
+
+ rs_8xx_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ state->count = 0;
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
+ info->tty = 0;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ ser_info_t *info)
+{
+#ifdef DO_THIS_LATER
+ struct wait_queue wait = { current, NULL };
+#endif
+ struct serial_state *state = info->state;
+ int retval;
+ int do_clocal = 0;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= ASYNC_CALLOUT_ACTIVE;
+ return 0;
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ * If this is an SMC port, we don't have modem control to wait
+ * for, so just get out here.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR)) ||
+ (info->state->smc_scc_num < SCC_NUM_BASE)) {
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & ASYNC_CALLOUT_ACTIVE) {
+ if (state->normal_termios.c_cflag & CLOCAL)
+ do_clocal = 1;
+ } else {
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+ }
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, state->count is dropped by one, so that
+ * rs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+#ifdef DO_THIS_LATER
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttys%d, count = %d\n",
+ state->line, state->count);
+#endif
+ cli();
+ if (!tty_hung_up_p(filp))
+ state->count--;
+ sti();
+ info->blocked_open++;
+ while (1) {
+ cli();
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (tty->termios->c_cflag & CBAUD))
+ serial_out(info, UART_MCR,
+ serial_inp(info, UART_MCR) |
+ (UART_MCR_DTR | UART_MCR_RTS));
+ sti();
+ current->state = TASK_INTERRUPTIBLE;
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ !(info->flags & ASYNC_CLOSING) &&
+ (do_clocal || (serial_in(info, UART_MSR) &
+ UART_MSR_DCD)))
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ state->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+#endif /* DO_THIS_LATER */
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+static int get_async_struct(int line, ser_info_t **ret_info)
+{
+ struct serial_state *sstate;
+
+ sstate = rs_table + line;
+ if (sstate->info) {
+ sstate->count++;
+ *ret_info = (ser_info_t *)sstate->info;
+ return 0;
+ }
+ else {
+ return -ENOMEM;
+ }
+}
+
+/*
+ * 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_8xx_open(struct tty_struct *tty, struct file * filp)
+{
+ ser_info_t *info;
+ int retval, line;
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+ if ((line < 0) || (line >= NR_PORTS))
+ return -ENODEV;
+ retval = get_async_struct(line, &info);
+ if (retval)
+ return retval;
+ if (serial_paranoia_check(info, tty->device, "rs_open"))
+ return -ENODEV;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
+ info->state->count);
+#endif
+ tty->driver_data = info;
+ info->tty = tty;
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ MOD_INC_USE_COUNT;
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+ if ((info->state->count == 1) &&
+ (info->flags & ASYNC_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->state->normal_termios;
+ else
+ *tty->termios = info->state->callout_termios;
+ change_speed(info);
+ }
+
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open ttys%d successful...", info->line);
+#endif
+ return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static int inline line_info(char *buf, struct serial_state *state)
+{
+#ifdef notdef
+ struct async_struct *info = state->info, scr_info;
+ char stat_buf[30], control, status;
+#endif
+ int ret;
+
+ ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
+ state->line,
+ (state->smc_scc_num < SCC_NUM_BASE) ? "SMC" : "SCC",
+ state->port, state->irq);
+
+ if (!state->port || (state->type == PORT_UNKNOWN)) {
+ ret += sprintf(buf+ret, "\n");
+ return ret;
+ }
+
+#ifdef notdef
+ /*
+ * Figure out the current RS-232 lines
+ */
+ if (!info) {
+ info = &scr_info; /* This is just for serial_{in,out} */
+
+ info->magic = SERIAL_MAGIC;
+ info->port = state->port;
+ info->flags = state->flags;
+ info->quot = 0;
+ info->tty = 0;
+ }
+ cli();
+ status = serial_in(info, UART_MSR);
+ control = info ? info->MCR : serial_in(info, UART_MCR);
+ sti();
+
+ stat_buf[0] = 0;
+ stat_buf[1] = 0;
+ if (control & UART_MCR_RTS)
+ strcat(stat_buf, "|RTS");
+ if (status & UART_MSR_CTS)
+ strcat(stat_buf, "|CTS");
+ if (control & UART_MCR_DTR)
+ strcat(stat_buf, "|DTR");
+ if (status & UART_MSR_DSR)
+ strcat(stat_buf, "|DSR");
+ if (status & UART_MSR_DCD)
+ strcat(stat_buf, "|CD");
+ if (status & UART_MSR_RI)
+ strcat(stat_buf, "|RI");
+
+ if (info->quot) {
+ ret += sprintf(buf+ret, " baud:%d",
+ state->baud_base / info->quot);
+ }
+
+ ret += sprintf(buf+ret, " tx:%d rx:%d",
+ state->icount.tx, state->icount.rx);
+
+ if (state->icount.frame)
+ ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
+
+ if (state->icount.parity)
+ ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
+
+ if (state->icount.brk)
+ ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
+
+ if (state->icount.overrun)
+ ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
+
+ /*
+ * Last thing is the RS-232 status lines
+ */
+ ret += sprintf(buf+ret, " %s\n", stat_buf+1);
+#endif
+ return ret;
+}
+
+int rs_8xx_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int i, len = 0;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+ for (i = 0; i < NR_PORTS && len < 4000; i++) {
+ len += line_info(page + len, &rs_table[i]);
+ if (len+begin > off+count)
+ goto done;
+ if (len+begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+done:
+ if (off >= len+begin)
+ return 0;
+ *start = page + (begin-off);
+ return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * 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 _INLINE_ void show_serial_version(void)
+{
+ printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+}
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+__initfunc(int rs_8xx_init(void))
+{
+ struct serial_state * state;
+ ser_info_t *info;
+ uint mem_addr, dp_addr;
+ int i, j;
+ ushort chan;
+ volatile cbd_t *bdp;
+ volatile cpm8xx_t *cp;
+ volatile smc_t *sp;
+ volatile smc_uart_t *up;
+
+ init_bh(SERIAL_BH, do_serial_bh);
+#if 0
+ timer_table[RS_TIMER].fn = rs_8xx_timer;
+ timer_table[RS_TIMER].expires = 0;
+#endif
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+ serial_driver.driver_name = "serial";
+ serial_driver.name = "ttyS";
+ serial_driver.major = TTY_MAJOR;
+ serial_driver.minor_start = 64;
+ serial_driver.num = NR_PORTS;
+ 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;
+ serial_driver.refcount = &serial_refcount;
+ serial_driver.table = serial_table;
+ serial_driver.termios = serial_termios;
+ serial_driver.termios_locked = serial_termios_locked;
+
+ serial_driver.open = rs_8xx_open;
+ serial_driver.close = rs_8xx_close;
+ serial_driver.write = rs_8xx_write;
+ serial_driver.put_char = rs_8xx_put_char;
+ serial_driver.write_room = rs_8xx_write_room;
+ serial_driver.chars_in_buffer = rs_8xx_chars_in_buffer;
+ serial_driver.flush_buffer = rs_8xx_flush_buffer;
+ serial_driver.ioctl = rs_8xx_ioctl;
+ serial_driver.throttle = rs_8xx_throttle;
+ serial_driver.unthrottle = rs_8xx_unthrottle;
+ serial_driver.send_xchar = rs_8xx_send_xchar;
+ serial_driver.set_termios = rs_8xx_set_termios;
+ serial_driver.stop = rs_8xx_stop;
+ serial_driver.start = rs_8xx_start;
+ serial_driver.hangup = rs_8xx_hangup;
+ serial_driver.wait_until_sent = rs_8xx_wait_until_sent;
+ serial_driver.read_proc = rs_8xx_read_proc;
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+ callout_driver.name = "cua";
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+ callout_driver.read_proc = 0;
+ callout_driver.proc_entry = 0;
+
+ if (tty_register_driver(&serial_driver))
+ panic("Couldn't register serial driver\n");
+ if (tty_register_driver(&callout_driver))
+ panic("Couldn't register callout driver\n");
+
+ cp = cpmp; /* Get pointer to Communication Processor */
+
+ /* Configure SMCs Tx/Rx instead of port B parallel I/O.
+ */
+ cp->cp_pbpar |= 0x00000cc0;
+ cp->cp_pbdir &= ~0x00000cc0;
+ cp->cp_pbodr &= ~0x00000cc0;
+
+ /* Wire BRG1 to SMC1 and BRG2 to SMC2.
+ */
+ cp->cp_simode = 0x10000000;
+
+ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+ state->magic = SSTATE_MAGIC;
+ state->line = i;
+ state->type = PORT_UNKNOWN;
+ state->custom_divisor = 0;
+ state->close_delay = 5*HZ/10;
+ state->closing_wait = 30*HZ;
+ state->callout_termios = callout_driver.init_termios;
+ state->normal_termios = serial_driver.init_termios;
+ 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;
+ printk(KERN_INFO "ttyS%02d at 0x%04x is a %s\n",
+ i, state->port,
+ (state->smc_scc_num < SCC_NUM_BASE) ? "SMC" : "SCC");
+#ifdef CONFIG_SERIAL_CONSOLE
+ /* If we just printed the message on the console port, and
+ * we are about to initialize it for general use, we have
+ * to wait a couple of character times for the CR/NL to
+ * make it out of the transmit buffer.
+ */
+ if (i == CONFIG_SERIAL_CONSOLE_PORT)
+ udelay(2000);
+#endif
+ info = kmalloc(sizeof(ser_info_t), GFP_KERNEL);
+ if (info) {
+ memset(info, 0, sizeof(ser_info_t));
+ info->magic = SERIAL_MAGIC;
+ info->flags = state->flags;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->tqueue_hangup.routine = do_serial_hangup;
+ info->tqueue_hangup.data = info;
+ info->line = i;
+ info->state = state;
+ state->info = (struct async_struct *)info;
+
+ /* Right now, assume we are using SMCs.
+ */
+ sp = &cp->cp_smc[state->smc_scc_num];
+
+ up = (smc_uart_t *)&cp->cp_dparam[state->port];
+
+ /* We need to allocate a transmit and receive buffer
+ * descriptors from dual port ram, and a character
+ * buffer area from host mem.
+ */
+ dp_addr = mbx_cpm_dpalloc(sizeof(cbd_t) * RX_NUM_FIFO);
+
+ /* Allocate space for FIFOs in the host memory.
+ */
+ mem_addr = mbx_cpm_hostalloc(RX_NUM_FIFO * RX_BUF_SIZE);
+
+ /* Set the physical address of the host memory
+ * buffers in the buffer descriptors, and the
+ * virtual address for us to work with.
+ */
+ bdp = (cbd_t *)&cp->cp_dpmem[dp_addr];
+ up->smc_rbase = dp_addr;
+ info->rx_cur = info->rx_bd_base = (cbd_t *)bdp;
+
+ for (j=0; j<(RX_NUM_FIFO-1); j++) {
+ bdp->cbd_bufaddr = __pa(mem_addr);
+ bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
+ mem_addr += RX_BUF_SIZE;
+ bdp++;
+ }
+ bdp->cbd_bufaddr = __pa(mem_addr);
+ bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
+
+ dp_addr = mbx_cpm_dpalloc(sizeof(cbd_t) * TX_NUM_FIFO);
+
+ /* Allocate space for FIFOs in the host memory.
+ */
+ mem_addr = mbx_cpm_hostalloc(TX_NUM_FIFO * TX_BUF_SIZE);
+
+ /* Set the physical address of the host memory
+ * buffers in the buffer descriptors, and the
+ * virtual address for us to work with.
+ */
+ bdp = (cbd_t *)&cp->cp_dpmem[dp_addr];
+ up->smc_tbase = dp_addr;
+ info->tx_cur = info->tx_bd_base = (cbd_t *)bdp;
+
+ for (j=0; j<(TX_NUM_FIFO-1); j++) {
+ bdp->cbd_bufaddr = __pa(mem_addr);
+ bdp->cbd_sc = BD_SC_INTRPT;
+ mem_addr += TX_BUF_SIZE;
+ bdp++;
+ }
+ bdp->cbd_bufaddr = __pa(mem_addr);
+ bdp->cbd_sc = (BD_SC_WRAP | BD_SC_INTRPT);
+
+ /* Set up the uart parameters in the parameter ram.
+ */
+ up->smc_rfcr = SMC_EB;
+ up->smc_tfcr = SMC_EB;
+
+ /* Set this to 1 for now, so we get single character
+ * interrupts. Using idle charater time requires
+ * some additional tuning.
+ */
+ up->smc_mrblr = 1; /* receive buffer length */
+ up->smc_maxidl = 0; /* wait forever for next char */
+ up->smc_brkcr = 1; /* number of break chars */
+
+ /* Send the CPM an initialize command.
+ */
+ if (state->smc_scc_num == 0)
+ chan = CPM_CR_CH_SMC1;
+ else
+ chan = CPM_CR_CH_SMC2;
+ cp->cp_cpcr = mk_cr_cmd(chan,
+ CPM_CR_INIT_TRX) | CPM_CR_FLG;
+ while (cp->cp_cpcr & CPM_CR_FLG);
+
+ /* Set UART mode, 8 bit, no parity, one stop.
+ * Enable receive and transmit.
+ */
+ sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
+
+ /* Disable all interrupts and clear all pending
+ * events.
+ */
+ sp->smc_smcm = 0;
+ sp->smc_smce = 0xff;
+
+ /* Install interrupt handler.
+ */
+ cpm_install_handler(state->irq, rs_8xx_interrupt, info);
+
+ /* Set up the baud rate generator.
+ */
+ mbx_cpm_setbrg(state->smc_scc_num, 9600);
+
+ /* If the port is the console, enable Rx and Tx.
+ */
+#ifdef CONFIG_SERIAL_CONSOLE
+ if (i == CONFIG_SERIAL_CONSOLE_PORT)
+ sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
+#endif
+ }
+ }
+ return 0;
+}
+
+/*
+ * The serial console driver used during boot. Note that these names
+ * clash with those found in "serial.c", so we currently can't support
+ * the 16xxx uarts and these at the same time. I will fix this to become
+ * an indirect function call from tty_io.c (or something).
+ */
+
+#ifdef CONFIG_SERIAL_CONSOLE
+
+/*
+ * Print a string to the serial port trying not to disturb any possible
+ * real use of the port...
+ */
+static void serial_console_write(struct console *c, const char *s,
+ unsigned count)
+{
+ struct serial_state *ser;
+ ser_info_t *info;
+ unsigned i;
+ volatile cbd_t *bdp, *bdbase;
+ volatile smc_uart_t *up;
+ volatile u_char *cp;
+
+ ser = rs_table + c->index;
+
+ /* If the port has been initialized for general use, we have
+ * to use the buffer descriptors allocated there. Otherwise,
+ * we simply use the single buffer allocated.
+ */
+ if ((info = (ser_info_t *)ser->info) != NULL) {
+ bdp = info->tx_cur;
+ bdbase = info->tx_bd_base;
+ }
+ else {
+ /* Pointer to UART in parameter ram.
+ */
+ up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];
+
+ /* Get the address of the host memory buffer.
+ */
+ bdp = bdbase = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];
+ }
+
+ /*
+ * We need to gracefully shut down the transmitter, disable
+ * interrupts, then send our bytes out.
+ */
+
+ /*
+ * Now, do each character. This is not as bad as it looks
+ * since this is a holding FIFO and not a transmitting FIFO.
+ * We could add the complexity of filling the entire transmit
+ * buffer, but we would just wait longer between accesses......
+ */
+ for (i = 0; i < count; i++, s++) {
+
+ /* Wait for transmitter fifo to empty.
+ * Ready indicates output is ready, and xmt is doing
+ * that, not that it is ready for us to send.
+ */
+ while (bdp->cbd_sc & BD_SC_READY);
+
+ /* Send the character out. */
+ cp = __va(bdp->cbd_bufaddr);
+ *cp = *s;
+ bdp->cbd_datlen = 1;
+ bdp->cbd_sc |= BD_SC_READY;
+
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = bdbase;
+ else
+ bdp++;
+
+ /* if a LF, also do CR... */
+ if (*s == 10) {
+ while (bdp->cbd_sc & BD_SC_READY);
+ cp = __va(bdp->cbd_bufaddr);
+ *cp = 13;
+ bdp->cbd_datlen = 1;
+ bdp->cbd_sc |= BD_SC_READY;
+
+ if (bdp->cbd_sc & BD_SC_WRAP) {
+ bdp = bdbase;
+ }
+ else {
+ bdp++;
+ }
+ }
+ }
+
+ /*
+ * Finally, Wait for transmitter & holding register to empty
+ * and restore the IER
+ */
+ while (bdp->cbd_sc & BD_SC_READY);
+
+ if (info)
+ info->tx_cur = (cbd_t *)bdp;
+}
+
+/*
+ * Receive character from the serial port. This only works well
+ * before the port is initialize for real use.
+ */
+static int serial_console_wait_key(struct console *co)
+{
+ struct serial_state *ser;
+ u_char c, *cp;
+ ser_info_t *info;
+ volatile cbd_t *bdp;
+ volatile smc_uart_t *up;
+
+ ser = rs_table + co->index;
+
+ /* Pointer to UART in parameter ram.
+ */
+ up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];
+
+ /* Get the address of the host memory buffer.
+ * If the port has been initialized for general use, we must
+ * use information from the port structure.
+ */
+ if ((info = ser->info))
+ bdp = info->rx_cur;
+ else
+ bdp = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
+
+ /*
+ * We need to gracefully shut down the receiver, disable
+ * interrupts, then read the input.
+ */
+ while (bdp->cbd_sc & BD_SC_EMPTY); /* Wait for a character */
+ cp = __va(bdp->cbd_bufaddr);
+
+ if (info) {
+ if (bdp->cbd_sc & BD_SC_WRAP) {
+ bdp = info->rx_bd_base;
+ }
+ else {
+ bdp++;
+ }
+ info->rx_cur = (cbd_t *)bdp;
+ }
+
+ c = *cp;
+ return((int)c);
+}
+
+static kdev_t serial_console_device(struct console *c)
+{
+ return MKDEV(TTYAUX_MAJOR, 64 + c->index);
+}
+
+/* This must always be called before the rs_8xx_init() function, otherwise
+ * it blows away the port control information.
+*/
+__initfunc(static int serial_console_setup(struct console *co, char *options))
+{
+ struct serial_state *ser;
+ uint mem_addr, dp_addr;
+ volatile cbd_t *bdp;
+ volatile cpm8xx_t *cp;
+ volatile smc_t *sp;
+ volatile smc_uart_t *up;
+
+ co->cflag = CREAD|CLOCAL|B9600|CS8;
+
+ ser = rs_table + co->index;
+
+ cp = cpmp; /* Get pointer to Communication Processor */
+
+ /* Right now, assume we are using SMCs.
+ */
+ sp = &cp->cp_smc[ser->smc_scc_num];
+
+ /* When we get here, the CPM has been reset, so we need
+ * to configure the port.
+ * We need to allocate a transmit and receive buffer descriptor
+ * from dual port ram, and a character buffer area from host mem.
+ */
+ up = (smc_uart_t *)&cp->cp_dparam[ser->port];
+ cp->cp_pbpar = 0x00c0; /* Enable SMC1 instead of Port B I/O */
+
+ /* Allocate space for two buffer descriptors in the DP ram.
+ */
+ dp_addr = mbx_cpm_dpalloc(sizeof(cbd_t) * 2);
+
+ /* Allocate space for two 2 byte FIFOs in the host memory.
+ */
+ mem_addr = mbx_cpm_hostalloc(4);
+
+ /* Set the physical address of the host memory buffers in
+ * the buffer descriptors.
+ */
+ bdp = (cbd_t *)&cp->cp_dpmem[dp_addr];
+ bdp->cbd_bufaddr = __pa(mem_addr);
+ (bdp+1)->cbd_bufaddr = __pa(mem_addr+2);
+
+ /* For the receive, set empty and wrap.
+ * For transmit, set wrap.
+ */
+ bdp->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
+ (bdp+1)->cbd_sc = BD_SC_WRAP;
+
+ /* Set up the uart parameters in the parameter ram.
+ */
+ up->smc_rbase = dp_addr; /* Base of receive buffer desc. */
+ up->smc_tbase = dp_addr+sizeof(cbd_t); /* Base of xmt buffer desc. */
+ up->smc_rfcr = SMC_EB;
+ up->smc_tfcr = SMC_EB;
+
+ /* Set this to 1 for now, so we get single character interrupts.
+ */
+ up->smc_mrblr = 1; /* receive buffer length */
+ up->smc_maxidl = 0; /* wait forever for next char */
+
+ /* Send the CPM an initialize command.
+ */
+ cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC1, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+ while (cp->cp_cpcr & CPM_CR_FLG);
+
+ /* Set UART mode, 8 bit, no parity, one stop.
+ * Enable receive and transmit.
+ */
+ sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
+
+ /* Set up the baud rate generator.
+ */
+ mbx_cpm_setbrg(ser->smc_scc_num, 9600);
+
+ /* And finally, enable Rx and Tx.
+ */
+ sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
+
+ return 0;
+}
+
+static struct console sercons = {
+ "ttyS",
+ serial_console_write,
+ NULL,
+ serial_console_device,
+ serial_console_wait_key,
+ NULL,
+ serial_console_setup,
+ CON_PRINTBUFFER,
+ CONFIG_SERIAL_CONSOLE_PORT,
+ 0,
+ NULL
+};
+
+/*
+ * Register console.
+ */
+__initfunc (long console_8xx_init(long kmem_start, long kmem_end))
+{
+ register_console(&sercons);
+ return kmem_start;
+}
+
+#endif
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