patch-2.4.10 linux/drivers/char/serial_tx3912.c
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- Lines: 1080
- Date:
Fri Sep 7 09:28:38 2001
- Orig file:
v2.4.9/linux/drivers/char/serial_tx3912.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/drivers/char/serial_tx3912.c linux/drivers/char/serial_tx3912.c
@@ -0,0 +1,1079 @@
+/*
+ * drivers/char/serial_tx3912.c
+ *
+ * Copyright (C) 1999 Harald Koerfgen
+ * Copyright (C) 2000 Jim Pick <jim@jimpick.com>
+ * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Serial driver for TMPR3912/05 and PR31700 processors
+ */
+#include <linux/init.h>
+#include <linux/config.h>
+#include <linux/tty.h>
+#include <linux/major.h>
+#include <linux/ptrace.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/delay.h>
+#include <asm/wbflush.h>
+#include <asm/tx3912.h>
+#include "serial_tx3912.h"
+
+/*
+ * Forward declarations for serial routines
+ */
+static void rs_disable_tx_interrupts (void * ptr);
+static void rs_enable_tx_interrupts (void * ptr);
+static void rs_disable_rx_interrupts (void * ptr);
+static void rs_enable_rx_interrupts (void * ptr);
+static int rs_get_CD (void * ptr);
+static void rs_shutdown_port (void * ptr);
+static int rs_set_real_termios (void *ptr);
+static int rs_chars_in_buffer (void * ptr);
+static void rs_hungup (void *ptr);
+static void rs_close (void *ptr);
+
+/*
+ * Used by generic serial driver to access hardware
+ */
+static struct real_driver rs_real_driver = {
+ disable_tx_interrupts: rs_disable_tx_interrupts,
+ enable_tx_interrupts: rs_enable_tx_interrupts,
+ disable_rx_interrupts: rs_disable_rx_interrupts,
+ enable_rx_interrupts: rs_enable_rx_interrupts,
+ get_CD: rs_get_CD,
+ shutdown_port: rs_shutdown_port,
+ set_real_termios: rs_set_real_termios,
+ chars_in_buffer: rs_chars_in_buffer,
+ close: rs_close,
+ hungup: rs_hungup,
+};
+
+/*
+ * Structures and such for TTY sessions and usage counts
+ */
+static struct tty_driver rs_driver, rs_callout_driver;
+static struct tty_struct * rs_table[TX3912_UART_NPORTS] = { NULL, };
+static struct termios ** rs_termios;
+static struct termios ** rs_termios_locked;
+struct rs_port *rs_ports;
+int rs_refcount;
+int rs_initialized = 0;
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * 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
+ * -----------------------------------------------------------------------
+ */
+static inline void receive_char_pio(struct rs_port *port)
+{
+ struct tty_struct *tty = port->gs.tty;
+ unsigned char ch;
+ int counter = 2048;
+
+ /* While there are characters, get them ... */
+ while (counter>0) {
+ if (!(inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL))
+ break;
+ ch = inb(port->base + TX3912_UART_DATA);
+ if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+ *tty->flip.char_buf_ptr++ = ch;
+ *tty->flip.flag_buf_ptr++ = 0;
+ tty->flip.count++;
+ }
+ udelay(1); /* Allow things to happen - it take a while */
+ counter--;
+ }
+ if (!counter)
+ printk( "Ugh, looped in receive_char_pio!\n" );
+
+ tty_flip_buffer_push(tty);
+
+#if 0
+ /* Now handle error conditions */
+ if (*status & (INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_PARITYERR_INT) |
+ INTTYPE(UART_BREAK_INT))) {
+
+ /*
+ * Now check to see if character should be
+ * ignored, and mask off conditions which
+ * should be ignored.
+ */
+ if (*status & port->ignore_status_mask) {
+ goto ignore_char;
+ }
+ *status &= port->read_status_mask;
+
+ if (*status & INTTYPE(UART_BREAK_INT)) {
+ rs_dprintk(TX3912_UART_DEBUG_INTERRUPTS, "handling break....");
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ }
+ else if (*status & INTTYPE(UART_PARITYERR_INT)) {
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ }
+ else if (*status & INTTYPE(UART_FRAMEERR_INT)) {
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ }
+ if (*status & INTTYPE(UART_RXOVERRUN_INT)) {
+ /*
+ * 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;
+ }
+ }
+ }
+
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+
+ignore_char:
+ tty_flip_buffer_push(tty);
+#endif
+}
+
+static inline void transmit_char_pio(struct rs_port *port)
+{
+ /* While I'm able to transmit ... */
+ for (;;) {
+ if (!(inl(port->base + TX3912_UART_CTRL1) & UART_TX_EMPTY))
+ break;
+ else if (port->x_char) {
+ outb(port->x_char, port->base + TX3912_UART_DATA);
+ port->icount.tx++;
+ port->x_char = 0;
+ }
+ else if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped ||
+ port->gs.tty->hw_stopped) {
+ break;
+ }
+ else {
+ outb(port->gs.xmit_buf[port->gs.xmit_tail++],
+ port->base + TX3912_UART_DATA);
+ port->icount.tx++;
+ port->gs.xmit_tail &= SERIAL_XMIT_SIZE-1;
+ if (--port->gs.xmit_cnt <= 0) {
+ break;
+ }
+ }
+ udelay(10); /* Allow things to happen - it take a while */
+ }
+
+ if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped ||
+ port->gs.tty->hw_stopped) {
+ rs_disable_tx_interrupts(port);
+ }
+
+ if (port->gs.xmit_cnt <= port->gs.wakeup_chars) {
+ if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ port->gs.tty->ldisc.write_wakeup)
+ (port->gs.tty->ldisc.write_wakeup)(port->gs.tty);
+ rs_dprintk (TX3912_UART_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n",
+ port->gs.wakeup_chars);
+ wake_up_interruptible(&port->gs.tty->write_wait);
+ }
+}
+
+
+
+static inline void check_modem_status(struct rs_port *port)
+{
+ /* We don't have a carrier detect line - but just respond
+ like we had one anyways so that open() becomes unblocked */
+ wake_up_interruptible(&port->gs.open_wait);
+}
+
+int count = 0;
+
+/*
+ * This is the serial driver's interrupt routine (inlined, because
+ * there are two different versions of this, one for each serial port,
+ * differing only by the bits used in interrupt status 2 register)
+ */
+
+static inline void rs_rx_interrupt(int irq, void *dev_id,
+ struct pt_regs * regs, int intshift)
+{
+ struct rs_port * port;
+ unsigned long int2status;
+ unsigned long flags;
+ unsigned long ints;
+
+ save_and_cli(flags);
+
+ port = (struct rs_port *)dev_id;
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift);
+
+ /* Get the interrrupts we have enabled */
+ int2status = IntStatus2 & IntEnable2;
+
+ /* Get interrupts in easy to use form */
+ ints = int2status >> intshift;
+
+ /* Clear any interrupts we might be about to handle */
+ IntClear2 = int2status & (
+ (INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_BREAK_INT) |
+ INTTYPE(UART_PARITYERR_INT) |
+ INTTYPE(UART_RX_INT)) << intshift);
+
+ if (!port || !port->gs.tty) {
+ restore_flags(flags);
+ return;
+ }
+
+ /* RX Receiver Holding Register Overrun */
+ if (ints & INTTYPE(UART_RXOVERRUN_INT)) {
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "overrun");
+ port->icount.overrun++;
+ }
+
+ /* RX Frame Error */
+ if (ints & INTTYPE(UART_FRAMEERR_INT)) {
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "frame error");
+ port->icount.frame++;
+ }
+
+ /* Break signal received */
+ if (ints & INTTYPE(UART_BREAK_INT)) {
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "break");
+ port->icount.brk++;
+ }
+
+ /* RX Parity Error */
+ if (ints & INTTYPE(UART_PARITYERR_INT)) {
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "parity error");
+ port->icount.parity++;
+ }
+
+ /* Receive byte (non-DMA) */
+ if (ints & INTTYPE(UART_RX_INT)) {
+ receive_char_pio(port);
+ }
+
+ restore_flags(flags);
+
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
+}
+
+static inline void rs_tx_interrupt(int irq, void *dev_id,
+ struct pt_regs * regs, int intshift)
+{
+ struct rs_port * port;
+ unsigned long int2status;
+ unsigned long flags;
+ unsigned long ints;
+
+ save_and_cli(flags);
+
+ port = (struct rs_port *)dev_id;
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift);
+
+ /* Get the interrrupts we have enabled */
+ int2status = IntStatus2 & IntEnable2;
+
+ if (!port || !port->gs.tty) {
+ restore_flags(flags);
+ return;
+ }
+
+ /* Get interrupts in easy to use form */
+ ints = int2status >> intshift;
+
+ /* Clear any interrupts we might be about to handle */
+ IntClear2 = int2status & (
+ (INTTYPE(UART_TX_INT) |
+ INTTYPE(UART_EMPTY_INT) |
+ INTTYPE(UART_TXOVERRUN_INT)) << intshift);
+
+ /* TX holding register empty, so transmit byte (non-DMA) */
+ if (ints & (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT))) {
+ transmit_char_pio(port);
+ }
+
+ /* TX Transmit Holding Register Overrun (shouldn't happen) */
+ if (ints & INTTYPE(UART_TXOVERRUN_INT)) {
+ printk ( "rs: TX overrun\n");
+ }
+
+ /*
+ check_modem_status();
+ */
+
+ restore_flags(flags);
+
+ rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
+}
+
+static void rs_rx_interrupt_uarta(int irq, void *dev_id,
+ struct pt_regs * regs)
+{
+ rs_rx_interrupt(irq, dev_id, regs, UARTA_SHIFT);
+}
+
+static void rs_tx_interrupt_uarta(int irq, void *dev_id,
+ struct pt_regs * regs)
+{
+ rs_tx_interrupt(irq, dev_id, regs, UARTA_SHIFT);
+}
+
+/*
+ ***********************************************************************
+ * Here are the routines that actually *
+ * interface with the generic_serial driver *
+ ***********************************************************************
+ */
+static void rs_disable_tx_interrupts (void * ptr)
+{
+ struct rs_port *port = ptr;
+ unsigned long flags;
+
+ save_and_cli(flags);
+ port->gs.flags &= ~GS_TX_INTEN;
+
+ IntEnable2 &= ~((INTTYPE(UART_TX_INT) |
+ INTTYPE(UART_EMPTY_INT) |
+ INTTYPE(UART_TXOVERRUN_INT)) << port->intshift);
+
+ IntClear2 = (INTTYPE(UART_TX_INT) |
+ INTTYPE(UART_EMPTY_INT) |
+ INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
+
+ restore_flags(flags);
+}
+
+static void rs_enable_tx_interrupts (void * ptr)
+{
+ struct rs_port *port = ptr;
+ unsigned long flags;
+
+ save_and_cli(flags);
+
+ IntClear2 = (INTTYPE(UART_TX_INT) |
+ INTTYPE(UART_EMPTY_INT) |
+ INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
+
+ IntEnable2 |= (INTTYPE(UART_TX_INT) |
+ INTTYPE(UART_EMPTY_INT) |
+ INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
+
+ /* Send a char to start TX interrupts happening */
+ transmit_char_pio(port);
+
+ restore_flags(flags);
+}
+
+static void rs_disable_rx_interrupts (void * ptr)
+{
+ struct rs_port *port = ptr;
+ unsigned long flags;
+
+ save_and_cli(flags);
+
+ IntEnable2 &= ~((INTTYPE(UART_RX_INT) |
+ INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_BREAK_INT) |
+ INTTYPE(UART_PARITYERR_INT)) << port->intshift);
+
+ IntClear2 = (INTTYPE(UART_RX_INT) |
+ INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_BREAK_INT) |
+ INTTYPE(UART_PARITYERR_INT)) << port->intshift;
+
+ restore_flags(flags);
+}
+
+static void rs_enable_rx_interrupts (void * ptr)
+{
+ struct rs_port *port = ptr;
+ unsigned long flags;
+
+ save_and_cli(flags);
+
+ IntEnable2 |= (INTTYPE(UART_RX_INT) |
+ INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_BREAK_INT) |
+ INTTYPE(UART_PARITYERR_INT)) << port->intshift;
+
+ /* Empty the input buffer - apparently this is *vital* */
+ while (inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL) {
+ inb(port->base + TX3912_UART_DATA);
+ }
+
+ IntClear2 = (INTTYPE(UART_RX_INT) |
+ INTTYPE(UART_RXOVERRUN_INT) |
+ INTTYPE(UART_FRAMEERR_INT) |
+ INTTYPE(UART_BREAK_INT) |
+ INTTYPE(UART_PARITYERR_INT)) << port->intshift;
+
+ restore_flags(flags);
+}
+
+
+static int rs_get_CD (void * ptr)
+{
+ /* No Carried Detect in Hardware - just return true */
+ func_exit();
+ return (1);
+}
+
+static void rs_shutdown_port (void * ptr)
+{
+ struct rs_port *port = ptr;
+
+ func_enter();
+
+ port->gs.flags &= ~GS_ACTIVE;
+
+ func_exit();
+}
+
+static int rs_set_real_termios (void *ptr)
+{
+ struct rs_port *port = ptr;
+ int t;
+
+ switch (port->gs.baud) {
+ /* Save some typing work... */
+#define e(x) case x:t= TX3912_UART_CTRL2_B ## x ; break
+ e(300);e(600);e(1200);e(2400);e(4800);e(9600);
+ e(19200);e(38400);e(57600);e(76800);e(115200);e(230400);
+ case 0 :t = -1;
+ break;
+ default:
+ /* Can I return "invalid"? */
+ t = TX3912_UART_CTRL2_B9600;
+ printk (KERN_INFO "rs: unsupported baud rate: %d.\n", port->gs.baud);
+ break;
+ }
+#undef e
+ if (t >= 0) {
+ /* Jim: Set Hardware Baud rate - there is some good
+ code in drivers/char/serial.c */
+
+ /* Program hardware for parity, data bits, stop bits (note: these are hardcoded to 8N1 */
+ UartA_Ctrl1 &= 0xf000000f;
+ UartA_Ctrl1 &= ~(UART_DIS_TXD | SER_SEVEN_BIT | SER_EVEN_PARITY | SER_TWO_STOP);
+
+#define CFLAG port->gs.tty->termios->c_cflag
+ if (C_PARENB(port->gs.tty)) {
+ if (!C_PARODD(port->gs.tty))
+ UartA_Ctrl1 |= SER_EVEN_PARITY;
+ else
+ UartA_Ctrl1 |= SER_ODD_PARITY;
+ }
+ if ((CFLAG & CSIZE)==CS6)
+ printk(KERN_ERR "6 bits not supported\n");
+ if ((CFLAG & CSIZE)==CS5)
+ printk(KERN_ERR "5 bits not supported\n");
+ if ((CFLAG & CSIZE)==CS7)
+ UartA_Ctrl1 |= SER_SEVEN_BIT;
+ if (C_CSTOPB(port->gs.tty))
+ UartA_Ctrl1 |= SER_TWO_STOP;
+
+ outl(t, port->base + TX3912_UART_CTRL2);
+ outl(0, port->base + TX3912_UART_DMA_CTRL1);
+ outl(0, port->base + TX3912_UART_DMA_CTRL2);
+ UartA_Ctrl1 |= TX3912_UART_CTRL1_UARTON;
+
+ /* wait until UARTA is stable */
+ while (~UartA_Ctrl1 & TX3912_UART_CTRL1_UARTON);
+ }
+
+ func_exit ();
+ return 0;
+}
+
+static int rs_chars_in_buffer (void * ptr)
+{
+ struct rs_port *port = ptr;
+ int scratch;
+
+ scratch = inl(port->base + TX3912_UART_CTRL1);
+
+ return ((scratch & UART_TX_EMPTY) ? 0 : 1);
+}
+
+/* ********************************************************************** *
+ * Here are the routines that actually *
+ * interface with the rest of the system *
+ * ********************************************************************** */
+static int rs_open (struct tty_struct * tty, struct file * filp)
+{
+ struct rs_port *port;
+ int retval, line;
+
+ func_enter();
+
+ if (!rs_initialized) {
+ return -EIO;
+ }
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p)\n",
+ (int) current->pid, line, tty, current->tty);
+
+ if ((line < 0) || (line >= TX3912_UART_NPORTS))
+ return -ENODEV;
+
+ /* Pre-initialized already */
+ port = & rs_ports[line];
+
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "port = %p\n", port);
+
+ tty->driver_data = port;
+ port->gs.tty = tty;
+ port->gs.count++;
+
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "starting port\n");
+
+ /*
+ * Start up serial port
+ */
+ retval = gs_init_port(&port->gs);
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "done gs_init\n");
+ if (retval) {
+ port->gs.count--;
+ return retval;
+ }
+
+ port->gs.flags |= GS_ACTIVE;
+
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "before inc_use_count (count=%d.\n",
+ port->gs.count);
+ if (port->gs.count == 1) {
+ MOD_INC_USE_COUNT;
+ }
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "after inc_use_count\n");
+
+ /* Jim: Initialize port hardware here */
+
+ /* Enable high-priority interrupts for UARTA */
+ IntEnable6 |= INT6_UARTARXINT;
+ rs_enable_rx_interrupts(&rs_ports[0]);
+
+ retval = gs_block_til_ready(&port->gs, filp);
+ rs_dprintk (TX3912_UART_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n",
+ retval, port->gs.count);
+
+ if (retval) {
+ MOD_DEC_USE_COUNT;
+ port->gs.count--;
+ return retval;
+ }
+ /* tty->low_latency = 1; */
+
+ if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = port->gs.normal_termios;
+ else
+ *tty->termios = port->gs.callout_termios;
+ rs_set_real_termios (port);
+ }
+
+ port->gs.session = current->session;
+ port->gs.pgrp = current->pgrp;
+ func_exit();
+
+ /* Jim */
+/* cli(); */
+
+ return 0;
+
+}
+
+
+
+static void rs_close (void *ptr)
+{
+ func_enter ();
+
+ /* Anything to do here? */
+
+ MOD_DEC_USE_COUNT;
+ func_exit ();
+}
+
+
+/* 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 rs_hungup (void *ptr)
+{
+ func_enter ();
+ MOD_DEC_USE_COUNT;
+ func_exit ();
+}
+
+static int rs_ioctl (struct tty_struct * tty, struct file * filp,
+ unsigned int cmd, unsigned long arg)
+{
+ int rc;
+ struct rs_port *port = tty->driver_data;
+ int ival;
+
+ rc = 0;
+ switch (cmd) {
+ case TIOCGSOFTCAR:
+ rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
+ (unsigned int *) arg);
+ break;
+ case TIOCSSOFTCAR:
+ if ((rc = verify_area(VERIFY_READ, (void *) arg,
+ sizeof(int))) == 0) {
+ get_user(ival, (unsigned int *) arg);
+ tty->termios->c_cflag =
+ (tty->termios->c_cflag & ~CLOCAL) |
+ (ival ? CLOCAL : 0);
+ }
+ break;
+ case TIOCGSERIAL:
+ if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
+ sizeof(struct serial_struct))) == 0)
+ gs_getserial(&port->gs, (struct serial_struct *) arg);
+ break;
+ case TIOCSSERIAL:
+ if ((rc = verify_area(VERIFY_READ, (void *) arg,
+ sizeof(struct serial_struct))) == 0)
+ rc = gs_setserial(&port->gs, (struct serial_struct *) arg);
+ break;
+ default:
+ rc = -ENOIOCTLCMD;
+ break;
+ }
+
+ /* func_exit(); */
+ return rc;
+}
+
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_send_xchar(struct tty_struct * tty, char ch)
+{
+ struct rs_port *port = (struct rs_port *)tty->driver_data;
+ func_enter ();
+
+ port->x_char = ch;
+ if (ch) {
+ /* Make sure transmit interrupts are on */
+ rs_enable_tx_interrupts(tty);
+ }
+
+ func_exit();
+}
+
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+#ifdef TX3912_UART_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ func_enter ();
+
+ if (I_IXOFF(tty))
+ rs_send_xchar(tty, STOP_CHAR(tty));
+
+ func_exit ();
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct rs_port *port = (struct rs_port *)tty->driver_data;
+#ifdef TX3912_UART_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ func_enter();
+
+ if (I_IXOFF(tty)) {
+ if (port->x_char)
+ port->x_char = 0;
+ else
+ rs_send_xchar(tty, START_CHAR(tty));
+ }
+
+ func_exit();
+}
+
+
+
+
+
+/* ********************************************************************** *
+ * Here are the initialization routines. *
+ * ********************************************************************** */
+
+void * ckmalloc (int size)
+{
+ void *p;
+
+ p = kmalloc(size, GFP_KERNEL);
+ if (p)
+ memset(p, 0, size);
+ return p;
+}
+
+
+
+static int rs_init_portstructs(void)
+{
+ struct rs_port *port;
+ int i;
+
+ /* Debugging */
+ func_enter();
+
+ rs_ports = ckmalloc(TX3912_UART_NPORTS * sizeof (struct rs_port));
+ if (!rs_ports)
+ return -ENOMEM;
+
+ rs_termios = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *));
+ if (!rs_termios) {
+ kfree (rs_ports);
+ return -ENOMEM;
+ }
+
+ rs_termios_locked = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *));
+ if (!rs_termios_locked) {
+ kfree (rs_ports);
+ kfree (rs_termios);
+ return -ENOMEM;
+ }
+
+ /* Adjust the values in the "driver" */
+ rs_driver.termios = rs_termios;
+ rs_driver.termios_locked = rs_termios_locked;
+
+ port = rs_ports;
+ for (i=0; i < TX3912_UART_NPORTS;i++) {
+ rs_dprintk (TX3912_UART_DEBUG_INIT, "initing port %d\n", i);
+ port->gs.callout_termios = tty_std_termios;
+ port->gs.normal_termios = tty_std_termios;
+ port->gs.magic = SERIAL_MAGIC;
+ port->gs.close_delay = HZ/2;
+ port->gs.closing_wait = 30 * HZ;
+ port->gs.rd = &rs_real_driver;
+#ifdef NEW_WRITE_LOCKING
+ port->gs.port_write_sem = MUTEX;
+#endif
+#ifdef DECLARE_WAITQUEUE
+ init_waitqueue_head(&port->gs.open_wait);
+ init_waitqueue_head(&port->gs.close_wait);
+#endif
+ port->base = (i == 0) ? TX3912_UARTA_BASE : TX3912_UARTB_BASE;
+ port->intshift = (i == 0) ? UARTA_SHIFT : UARTB_SHIFT;
+ rs_dprintk (TX3912_UART_DEBUG_INIT, "base 0x%08lx intshift %d\n",
+ port->base, port->intshift);
+ port++;
+ }
+
+ func_exit();
+ return 0;
+}
+
+static int rs_init_drivers(void)
+{
+ int error;
+
+ func_enter();
+
+ memset(&rs_driver, 0, sizeof(rs_driver));
+ rs_driver.magic = TTY_DRIVER_MAGIC;
+ rs_driver.driver_name = "serial";
+ rs_driver.name = "ttyS";
+ rs_driver.major = TTY_MAJOR;
+ rs_driver.minor_start = 64;
+ rs_driver.num = TX3912_UART_NPORTS;
+ rs_driver.type = TTY_DRIVER_TYPE_SERIAL;
+ rs_driver.subtype = SERIAL_TYPE_NORMAL;
+ rs_driver.init_termios = tty_std_termios;
+ rs_driver.init_termios.c_cflag =
+ B115200 | CS8 | CREAD | HUPCL | CLOCAL;
+ rs_driver.refcount = &rs_refcount;
+ rs_driver.table = rs_table;
+ rs_driver.termios = rs_termios;
+ rs_driver.termios_locked = rs_termios_locked;
+
+ rs_driver.open = rs_open;
+ rs_driver.close = gs_close;
+ rs_driver.write = gs_write;
+ rs_driver.put_char = gs_put_char;
+ rs_driver.flush_chars = gs_flush_chars;
+ rs_driver.write_room = gs_write_room;
+ rs_driver.chars_in_buffer = gs_chars_in_buffer;
+ rs_driver.flush_buffer = gs_flush_buffer;
+ rs_driver.ioctl = rs_ioctl;
+ rs_driver.throttle = rs_throttle;
+ rs_driver.unthrottle = rs_unthrottle;
+ rs_driver.set_termios = gs_set_termios;
+ rs_driver.stop = gs_stop;
+ rs_driver.start = gs_start;
+ rs_driver.hangup = gs_hangup;
+
+ rs_callout_driver = rs_driver;
+ rs_callout_driver.name = "cua";
+ rs_callout_driver.major = TTYAUX_MAJOR;
+ rs_callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+
+ if ((error = tty_register_driver(&rs_driver))) {
+ printk(KERN_ERR "Couldn't register serial driver, error = %d\n",
+ error);
+ return 1;
+ }
+ if ((error = tty_register_driver(&rs_callout_driver))) {
+ tty_unregister_driver(&rs_driver);
+ printk(KERN_ERR "Couldn't register callout driver, error = %d\n",
+ error);
+ return 1;
+ }
+
+ func_exit();
+ return 0;
+}
+
+
+void __init tx3912_rs_init(void)
+{
+ int rc;
+
+
+ func_enter();
+ rs_dprintk (TX3912_UART_DEBUG_INIT, "Initing serial module... (rs_debug=%d)\n", rs_debug);
+
+ rc = rs_init_portstructs ();
+ rs_init_drivers ();
+ if (request_irq(2, rs_tx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT,
+ "serial", &rs_ports[0])) {
+ printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n");
+ rc = 0;
+ }
+ if (request_irq(3, rs_rx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT,
+ "serial", &rs_ports[0])) {
+ printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n");
+ rc = 0;
+ }
+
+ IntEnable6 |= INT6_UARTARXINT;
+ rs_enable_rx_interrupts(&rs_ports[0]);
+
+#ifndef CONFIG_SERIAL_TX3912_CONSOLE
+{
+ unsigned int scratch = 0;
+
+ /* Setup master clock for UART */
+ scratch = inl(TX3912_CLK_CTRL_BASE);
+ scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK;
+ scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) &
+ TX3912_CLK_CTRL_SIBMCLKDIV_MASK)
+ | TX3912_CLK_CTRL_SIBMCLKDIR
+ | TX3912_CLK_CTRL_ENSIBMCLK
+ | TX3912_CLK_CTRL_CSERSEL;
+ outl(scratch, TX3912_CLK_CTRL_BASE);
+
+ /* Configure UARTA clock */
+ scratch = inl(TX3912_CLK_CTRL_BASE);
+ scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) &
+ TX3912_CLK_CTRL_CSERDIV_MASK)
+ | TX3912_CLK_CTRL_ENCSERCLK
+ | TX3912_CLK_CTRL_ENUARTACLK;
+ outl(scratch, TX3912_CLK_CTRL_BASE);
+
+ /* Setup UARTA for 115200,8N1 */
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
+ outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2);
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1);
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2);
+
+ /* Enable UARTA */
+ outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
+ while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) &
+ TX3912_UART_CTRL1_UARTON);
+}
+#endif
+
+ /* Note: I didn't do anything to enable the second UART */
+ if (rc >= 0)
+ rs_initialized++;
+
+ func_exit();
+}
+
+/*
+ * Begin serial console routines
+ */
+#ifdef CONFIG_SERIAL_TX3912_CONSOLE
+
+void serial_outc(unsigned char c)
+{
+ int i;
+ unsigned long int2;
+ #define BUSY_WAIT 10000
+
+ /*
+ * Turn UARTA interrupts off
+ */
+ int2 = IntEnable2;
+ IntEnable2 &=
+ ~(INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY);
+
+ /*
+ * The UART_TX_EMPTY bit in UartA_Ctrl1 seems
+ * not to be very reliable :-(
+ *
+ * Wait for the Tx register to become empty
+ */
+ for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++);
+
+ IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY;
+ UartA_Data = c;
+ for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++);
+ IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY;
+
+ IntEnable2 = int2;
+}
+
+static int serial_console_wait_key(struct console *co)
+{
+ unsigned int int2, res;
+
+ int2 = IntEnable2;
+ IntEnable2 = 0;
+
+ while (!(UartA_Ctrl1 & UART_RX_HOLD_FULL));
+ res = UartA_Data;
+ udelay(10);
+
+ IntEnable2 = int2;
+ return res;
+}
+
+static void serial_console_write(struct console *co, const char *s,
+ unsigned count)
+{
+ unsigned int i;
+
+ for (i = 0; i < count; i++) {
+ if (*s == '\n')
+ serial_outc('\r');
+ serial_outc(*s++);
+ }
+}
+
+static kdev_t serial_console_device(struct console *c)
+{
+ return MKDEV(TTY_MAJOR, 64 + c->index);
+}
+
+static __init int serial_console_setup(struct console *co, char *options)
+{
+ unsigned int scratch = 0;
+
+ /* Setup master clock for UART */
+ scratch = inl(TX3912_CLK_CTRL_BASE);
+ scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK;
+ scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) &
+ TX3912_CLK_CTRL_SIBMCLKDIV_MASK)
+ | TX3912_CLK_CTRL_SIBMCLKDIR
+ | TX3912_CLK_CTRL_ENSIBMCLK
+ | TX3912_CLK_CTRL_CSERSEL;
+ outl(scratch, TX3912_CLK_CTRL_BASE);
+
+ /* Configure UARTA clock */
+ scratch = inl(TX3912_CLK_CTRL_BASE);
+ scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) &
+ TX3912_CLK_CTRL_CSERDIV_MASK)
+ | TX3912_CLK_CTRL_ENCSERCLK
+ | TX3912_CLK_CTRL_ENUARTACLK;
+ outl(scratch, TX3912_CLK_CTRL_BASE);
+
+ /* Setup UARTA for 115200,8N1 */
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
+ outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2);
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1);
+ outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2);
+
+ /* Enable UARTA */
+ outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
+ while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) &
+ TX3912_UART_CTRL1_UARTON);
+
+ return 0;
+}
+
+static struct console sercons = {
+ name: "ttyS",
+ write: serial_console_write,
+ device: serial_console_device,
+ wait_key: serial_console_wait_key,
+ setup: serial_console_setup,
+ flags: CON_PRINTBUFFER,
+ index: -1
+};
+
+void __init tx3912_console_init(void)
+{
+ register_console(&sercons);
+}
+
+#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)