+/*
+<:copyright-gpl
+ Copyright 2002 Broadcom Corp. All Rights Reserved.
+
+ This program is free software; you can distribute it and/or modify it
+ under the terms of the GNU General Public License (Version 2) as
+ published by the Free Software Foundation.
+
+ This program is distributed in the hope it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+:>
+*/
+
+/* Description: Serial port driver for the BCM963XX. */
+
+#define CARDNAME "bcm963xx_serial driver"
+#define VERSION "2.0"
+#define VER_STR CARDNAME " v" VERSION "\n"
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+
+/* for definition of struct console */
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <asm/uaccess.h>
+
+#include <bcmtypes.h>
+#include <board.h>
+#include <bcm_map_part.h>
+#include <bcm_intr.h>
+#include <6348_map_part.h>
+#include <6348_intr.h>
+
+static DEFINE_SPINLOCK(bcm963xx_serial_lock);
+
+extern void _putc(char);
+extern void _puts(const char *);
+
+typedef struct bcm_serial {
+ volatile Uart *port;
+ int type;
+ int flags;
+ int irq;
+ int baud_base;
+ int blocked_open;
+ unsigned short close_delay;
+ unsigned short closing_wait;
+ unsigned short line; /* port/line number */
+ unsigned short cflags; /* line configuration flag */
+ unsigned short x_char; /* xon/xoff character */
+ unsigned short read_status_mask; /* mask for read condition */
+ unsigned short ignore_status_mask; /* mask for ignore condition */
+ unsigned long event; /* mask used in BH */
+ int xmit_head; /* Position of the head */
+ int xmit_tail; /* Position of the tail */
+ int xmit_cnt; /* Count of the chars in the buffer */
+ int count; /* indicates how many times it has been opened */
+ int magic;
+
+ struct async_icount icount; /* keep track of things ... */
+ struct tty_struct *tty; /* tty associated */
+ struct termios normal_termios;
+
+ wait_queue_head_t open_wait;
+ wait_queue_head_t close_wait;
+
+ long session; /* Session of opening process */
+ long pgrp; /* pgrp of opening process */
+
+ unsigned char is_initialized;
+} Context;
+
+
+/*---------------------------------------------------------------------*/
+/* Define bits in the Interrupt Enable register */
+/*---------------------------------------------------------------------*/
+/* Enable receive interrupt */
+#define RXINT (RXFIFONE|RXOVFERR)
+
+/* Enable transmit interrupt */
+#define TXINT (TXFIFOEMT|TXUNDERR|TXOVFERR)
+
+/* Enable receiver line status interrupt */
+#define LSINT (RXBRK|RXPARERR|RXFRAMERR)
+
+#define BCM_NUM_UARTS 1
+
+#define BD_BCM63XX_TIMER_CLOCK_INPUT (FPERIPH)
+
+
+static struct bcm_serial multi[BCM_NUM_UARTS];
+static struct bcm_serial *lines[BCM_NUM_UARTS];
+static struct tty_driver *serial_driver;
+static struct termios *serial_termios[BCM_NUM_UARTS];
+static struct termios *serial_termios_locked[BCM_NUM_UARTS];
+
+
+static void bcm_stop(struct tty_struct *tty);
+static void bcm_start(struct tty_struct *tty);
+static inline void receive_chars(struct bcm_serial *info);
+static int startup(struct bcm_serial *info);
+static void shutdown(struct bcm_serial *info);
+static void change_speed(volatile Uart * pUart, tcflag_t cFlag);
+static void bcm63xx_cons_flush_chars(struct tty_struct *tty);
+static int bcm63xx_cons_write(struct tty_struct *tty,
+ const unsigned char *buf, int count);
+static int bcm63xx_cons_write_room(struct tty_struct *tty);
+static int bcm_chars_in_buffer(struct tty_struct *tty);
+static void bcm_flush_buffer(struct tty_struct *tty);
+static void bcm_throttle(struct tty_struct *tty);
+static void bcm_unthrottle(struct tty_struct *tty);
+static void bcm_send_xchar(struct tty_struct *tty, char ch);
+static int get_serial_info(struct bcm_serial *info,
+ struct serial_struct *retinfo);
+static int set_serial_info(struct bcm_serial *info,
+ struct serial_struct *new_info);
+static int get_lsr_info(struct bcm_serial *info, unsigned int *value);
+static void send_break(struct bcm_serial *info, int duration);
+static int bcm_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+static void bcm_set_termios(struct tty_struct *tty,
+ struct termios *old_termios);
+static void bcm63xx_cons_close(struct tty_struct *tty, struct file *filp);
+static void bcm_hangup(struct tty_struct *tty);
+static int block_til_ready(struct tty_struct *tty, struct file *filp,
+ struct bcm_serial *info);
+static int bcm63xx_cons_open(struct tty_struct *tty, struct file *filp);
+static int __init bcm63xx_serialinit(void);
+
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop () and rs_start ()
+ *
+ * These routines are called before setting or resetting
+ * tty->stopped. They enable or disable transmitter interrupts,
+ * as necessary.
+ * ------------------------------------------------------------
+ */
+static void bcm_stop(struct tty_struct *tty)
+{
+}
+
+static void bcm_start(struct tty_struct *tty)
+{
+ _puts(CARDNAME " Start\n");
+}
+
+/*
+ * ------------------------------------------------------------
+ * receive_char ()
+ *
+ * This routine deals with inputs from any lines.
+ * ------------------------------------------------------------
+ */
+static inline void receive_chars(struct bcm_serial *info)
+{
+ struct tty_struct *tty = 0;
+ struct async_icount *icount;
+ int ignore = 0;
+ unsigned short status, tmp;
+ UCHAR ch = 0;
+ while ((status = info->port->intStatus) & RXINT) {
+ char flag_char = TTY_NORMAL;
+
+ if (status & RXFIFONE)
+ ch = info->port->Data; // Read the character
+ tty = info->tty; /* now tty points to the proper dev */
+ icount = &info->icount;
+ if (!tty)
+ break;
+ if (!tty_buffer_request_room(tty, 1))
+ break;
+ icount->rx++;
+ if (status & RXBRK) {
+ flag_char = TTY_BREAK;
+ icount->brk++;
+ }
+ // keep track of the statistics
+ if (status & (RXFRAMERR | RXPARERR | RXOVFERR)) {
+ if (status & RXPARERR) /* parity error */
+ icount->parity++;
+ else if (status & RXFRAMERR) /* frame error */
+ icount->frame++;
+ if (status & RXOVFERR) {
+ // Overflow. Reset the RX FIFO
+ info->port->fifoctl |= RSTRXFIFOS;
+ icount->overrun++;
+ }
+ // check to see if we should ignore the character
+ // and mask off conditions that should be ignored
+ if (status & info->ignore_status_mask) {
+ if (++ignore > 100)
+ break;
+ goto ignore_char;
+ }
+ // Mask off the error conditions we want to ignore
+ tmp = status & info->read_status_mask;
+ if (tmp & RXPARERR) {
+ flag_char = TTY_PARITY;
+ } else if (tmp & RXFRAMERR) {
+ flag_char = TTY_FRAME;
+ }
+ if (tmp & RXOVFERR) {
+ tty_insert_flip_char(tty, ch, flag_char);
+ ch = 0;
+ flag_char = TTY_OVERRUN;
+ if (!tty_buffer_request_room(tty, 1))
+ break;
+ }
+ }
+ tty_insert_flip_char(tty, ch, flag_char);
+ }
+ ignore_char:;
+ tty_flip_buffer_push(tty);
+ tty_schedule_flip(tty);
+
+}
+
+
+/*
+ * ------------------------------------------------------------
+ * bcm_interrupt ()
+ *
+ * this is the main interrupt routine for the chip.
+ * It deals with the multiple ports.
+ * ------------------------------------------------------------
+ */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+static irqreturn_t bcm_interrupt(int irq, void *dev)
+#else
+static void bcm_interrupt(int irq, void *dev, struct pt_regs *regs)
+#endif
+{
+ struct bcm_serial *info = lines[0];
+ UINT16 intStat;
+
+ /* get pending interrupt flags from UART */
+
+ /* Mask with only the serial interrupts that are enabled */
+ intStat = info->port->intStatus & info->port->intMask;
+ while (intStat) {
+ if (intStat & RXINT)
+ receive_chars(info);
+ else if (intStat & TXINT)
+ info->port->intStatus = TXINT;
+ else /* don't know what it was, so let's mask it */
+ info->port->intMask &= ~intStat;
+
+ intStat = info->port->intStatus & info->port->intMask;
+ }
+
+ // Clear the interrupt
+ enable_brcm_irq(INTERRUPT_ID_UART);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+ return IRQ_HANDLED;
+#endif
+}
+
+/*
+ * -------------------------------------------------------------------
+ * startup ()
+ *
+ * various initialization tasks
+ * -------------------------------------------------------------------
+ */
+static int startup(struct bcm_serial *info)
+{
+ // Port is already started...
+ return 0;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * shutdown ()
+ *
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ * -------------------------------------------------------------------
+ */
+static void shutdown(struct bcm_serial *info)
+{
+ unsigned long flags;
+ if (!info->is_initialized)
+ return;
+
+ spin_lock_irqsave(&bcm963xx_serial_lock, flags);
+
+ info->port->control &= ~(BRGEN | TXEN | RXEN);
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->is_initialized = 0;
+
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * change_speed ()
+ *
+ * Set the baud rate, character size, parity and stop bits.
+ * -------------------------------------------------------------------
+ */
+static void change_speed(volatile Uart * pUart, tcflag_t cFlag)
+{
+ unsigned long ulFlags, ulBaud, ulClockFreqHz, ulTmp;
+
+ spin_lock_irqsave(&bcm963xx_serial_lock, ulFlags);
+ switch (cFlag & (CBAUD | CBAUDEX)) {
+ case B115200:
+ ulBaud = 115200;
+ break;
+ case B57600:
+ ulBaud = 57600;
+ break;
+ case B38400:
+ ulBaud = 38400;
+ break;
+ case B19200:
+ ulBaud = 19200;
+ break;
+ case B9600:
+ ulBaud = 9600;
+ break;
+ case B4800:
+ ulBaud = 4800;
+ break;
+ case B2400:
+ ulBaud = 2400;
+ break;
+ case B1800:
+ ulBaud = 1800;
+ break;
+ case B1200:
+ ulBaud = 1200;
+ break;
+ case B600:
+ ulBaud = 600;
+ break;
+ case B300:
+ ulBaud = 300;
+ break;
+ case B200:
+ ulBaud = 200;
+ break;
+ case B150:
+ ulBaud = 150;
+ break;
+ case B134:
+ ulBaud = 134;
+ break;
+ case B110:
+ ulBaud = 110;
+ break;
+ case B75:
+ ulBaud = 75;
+ break;
+ case B50:
+ ulBaud = 50;
+ break;
+ default:
+ ulBaud = 115200;
+ break;
+ }
+
+ /* Calculate buad rate. */
+ ulClockFreqHz = BD_BCM63XX_TIMER_CLOCK_INPUT;
+ ulTmp = (ulClockFreqHz / ulBaud) / 16;
+ if (ulTmp & 0x01)
+ ulTmp /= 2; /* Rounding up, so sub is already accounted for */
+ else
+ ulTmp = (ulTmp / 2) - 1; /* Rounding down so we must sub 1 */
+ pUart->baudword = ulTmp;
+
+ /* Set character size, stop bits and parity. */
+ switch (cFlag & CSIZE) {
+ case CS5:
+ ulTmp = BITS5SYM; /* select transmit 5 bit data size */
+ break;
+ case CS6:
+ ulTmp = BITS6SYM; /* select transmit 6 bit data size */
+ break;
+ case CS7:
+ ulTmp = BITS7SYM; /* select transmit 7 bit data size */
+ break;
+ default:
+ ulTmp = BITS8SYM; /* select transmit 8 bit data size */
+ break;
+ }
+ if (cFlag & CSTOPB)
+ ulTmp |= TWOSTOP; /* select 2 stop bits */
+ else
+ ulTmp |= ONESTOP; /* select one stop bit */
+
+ /* Write these values into the config reg. */
+ pUart->config = ulTmp;
+ pUart->control &=
+ ~(RXPARITYEN | TXPARITYEN | RXPARITYEVEN | TXPARITYEVEN);
+ switch (cFlag & (PARENB | PARODD)) {
+ case PARENB | PARODD:
+ pUart->control |= RXPARITYEN | TXPARITYEN;
+ break;
+ case PARENB:
+ pUart->control |=
+ RXPARITYEN | TXPARITYEN | RXPARITYEVEN | TXPARITYEVEN;
+ break;
+ default:
+ pUart->control |= 0;
+ break;
+ }
+
+ /* Reset and flush uart */
+ pUart->fifoctl = RSTTXFIFOS | RSTRXFIFOS;
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, ulFlags);
+}
+
+
+/*
+ * -------------------------------------------------------------------
+ * bcm_flush_char ()
+ *
+ * Nothing to flush. Polled I/O is used.
+ * -------------------------------------------------------------------
+ */
+static void bcm63xx_cons_flush_chars(struct tty_struct *tty)
+{
+}
+
+
+/*
+ * -------------------------------------------------------------------
+ * bcm63xx_cons_write ()
+ *
+ * Main output routine using polled I/O.
+ * -------------------------------------------------------------------
+ */
+static int bcm63xx_cons_write(struct tty_struct *tty,
+ const unsigned char *buf, int count)
+{
+ int c;
+
+ for (c = 0; c < count; c++)
+ _putc(buf[c]);
+ return count;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * bcm63xx_cons_write_room ()
+ *
+ * Compute the amount of space available for writing.
+ * -------------------------------------------------------------------
+ */
+static int bcm63xx_cons_write_room(struct tty_struct *tty)
+{
+ /* Pick a number. Any number. Polled I/O is used. */
+ return 1024;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * bcm_chars_in_buffer ()
+ *
+ * compute the amount of char left to be transmitted
+ * -------------------------------------------------------------------
+ */
+static int bcm_chars_in_buffer(struct tty_struct *tty)
+{
+ return 0;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * bcm_flush_buffer ()
+ *
+ * Empty the output buffer
+ * -------------------------------------------------------------------
+ */
+static void bcm_flush_buffer(struct tty_struct *tty)
+{
+ tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * bcm_throttle () and bcm_unthrottle ()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled (or not).
+ * ------------------------------------------------------------
+ */
+static void bcm_throttle(struct tty_struct *tty)
+{
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+}
+
+static void bcm_unthrottle(struct tty_struct *tty)
+{
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ info->x_char = START_CHAR(tty);
+ }
+}
+
+static void bcm_send_xchar(struct tty_struct *tty, char ch)
+{
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+ info->x_char = ch;
+ if (ch)
+ bcm_start(info->tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl () and friends
+ * ------------------------------------------------------------
+ */
+static int get_serial_info(struct bcm_serial *info,
+ struct serial_struct *retinfo)
+{
+ struct serial_struct tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = info->type;
+ tmp.line = info->line;
+ tmp.port = (int) info->port;
+ tmp.irq = info->irq;
+ tmp.flags = 0;
+ tmp.baud_base = info->baud_base;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+
+ return copy_to_user(retinfo, &tmp, sizeof(*retinfo));
+}
+
+static int set_serial_info(struct bcm_serial *info,
+ struct serial_struct *new_info)
+{
+ struct serial_struct new_serial;
+ struct bcm_serial old_info;
+ int retval = 0;
+
+ if (!new_info)
+ return -EFAULT;
+
+ copy_from_user(&new_serial, new_info, sizeof(new_serial));
+ old_info = *info;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+
+ if (info->count > 1)
+ return -EBUSY;
+
+ /* OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+ info->baud_base = new_serial.baud_base;
+ info->type = new_serial.type;
+ info->close_delay = new_serial.close_delay;
+ info->closing_wait = new_serial.closing_wait;
+ retval = startup(info);
+ return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ */
+static int get_lsr_info(struct bcm_serial *info, unsigned int *value)
+{
+ return (0);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(struct bcm_serial *info, int duration)
+{
+ unsigned long flags;
+
+ if (!info->port)
+ return;
+
+ current->state = TASK_INTERRUPTIBLE;
+
+ /*save_flags (flags);
+ cli(); */
+ spin_lock_irqsave(&bcm963xx_serial_lock, flags);
+
+ info->port->control |= XMITBREAK;
+ schedule_timeout(duration);
+ info->port->control &= ~XMITBREAK;
+
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+ //restore_flags (flags);
+}
+
+static int bcm_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int error;
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+ int retval;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
+ (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+ 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 (!arg)
+ send_break(info, HZ / 4); /* 1/4 second */
+ return 0;
+
+ case TCSBRKP: /* support for POSIX tcsendbreak() */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
+ return 0;
+
+ case TIOCGSOFTCAR:
+ error =
+ access_ok(VERIFY_WRITE, (void *) arg, sizeof(long));
+ if (!error)
+ return -EFAULT;
+ else {
+ put_user(C_CLOCAL(tty) ? 1 : 0,
+ (unsigned long *) arg);
+ return 0;
+ }
+
+ case TIOCSSOFTCAR:
+ error = get_user(arg, (unsigned long *) arg);
+ if (error)
+ return error;
+ tty->termios->c_cflag =
+ ((tty->termios->
+ c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
+ return 0;
+
+ case TIOCGSERIAL:
+ error =
+ access_ok(VERIFY_WRITE, (void *) arg,
+ sizeof(struct serial_struct));
+ if (!error)
+ return -EFAULT;
+ else
+ return get_serial_info(info,
+ (struct serial_struct *)
+ arg);
+
+ case TIOCSSERIAL:
+ return set_serial_info(info, (struct serial_struct *) arg);
+
+ case TIOCSERGETLSR: /* Get line status register */
+ error =
+ access_ok(VERIFY_WRITE, (void *) arg,
+ sizeof(unsigned int));
+ if (!error)
+ return -EFAULT;
+ else
+ return get_lsr_info(info, (unsigned int *) arg);
+
+ case TIOCSERGSTRUCT:
+ error =
+ access_ok(VERIFY_WRITE, (void *) arg,
+ sizeof(struct bcm_serial));
+ if (!error)
+ return -EFAULT;
+ else {
+ copy_to_user((struct bcm_serial *) arg, info,
+ sizeof(struct bcm_serial));
+ return 0;
+ }
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void bcm_set_termios(struct tty_struct *tty,
+ struct termios *old_termios)
+{
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+
+ if (tty->termios->c_cflag != old_termios->c_cflag)
+ change_speed(info->port, tty->termios->c_cflag);
+}
+
+/*
+ * ------------------------------------------------------------
+ * bcm63xx_cons_close()
+ *
+ * This routine is called when the serial port gets closed. First, we
+ * wait for the last remaining data to be sent. Then, we turn off
+ * the transmit enable and receive enable flags.
+ * ------------------------------------------------------------
+ */
+static void bcm63xx_cons_close(struct tty_struct *tty, struct file *filp)
+{
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+ unsigned long flags;
+
+ if (!info)
+ return;
+
+ /*save_flags (flags);
+ cli(); */
+ spin_lock_irqsave(&bcm963xx_serial_lock, flags);
+
+ if (tty_hung_up_p(filp)) {
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+ //restore_flags (flags);
+ return;
+ }
+
+ if ((tty->count == 1) && (info->count != 1)) {
+
+ /* Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. Info->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
+ ("bcm63xx_cons_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+
+ if (--info->count < 0) {
+ printk("ds_close: bad serial port count for ttys%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+
+ if (info->count) {
+ //restore_flags (flags);
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+ return;
+ }
+
+ /* Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+
+ /* At this point we stop accepting input. To do this, we
+ * disable the receive line status interrupts.
+ */
+ shutdown(info);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+ if (tty->driver->flush_buffer)
+ tty->driver->flush_buffer(tty);
+#else
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer(tty);
+#endif
+ if (tty->ldisc.flush_buffer)
+ tty->ldisc.flush_buffer(tty);
+
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+ if (tty->ldisc.num != tty_ldisc_get(N_TTY)->num) {
+ if (tty->ldisc.close)
+ (tty->ldisc.close) (tty);
+ tty->ldisc = *tty_ldisc_get(N_TTY);
+ tty->termios->c_line = N_TTY;
+ if (tty->ldisc.open)
+ (tty->ldisc.open) (tty);
+ }
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(info->close_delay);
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ wake_up_interruptible(&info->close_wait);
+
+ //restore_flags (flags);
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+}
+
+/*
+ * bcm_hangup () --- called by tty_hangup() when a hangup is signaled.
+ */
+static void bcm_hangup(struct tty_struct *tty)
+{
+
+ struct bcm_serial *info = (struct bcm_serial *) tty->driver_data;
+
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ 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,
+ struct bcm_serial *info)
+{
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port. It also performs the
+ * serial-specific initialization for the tty structure.
+ */
+static int bcm63xx_cons_open(struct tty_struct *tty, struct file *filp)
+{
+ struct bcm_serial *info;
+ int retval, line;
+
+ // Make sure we're only opening on of the ports we support
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+ line = MINOR(tty->driver->cdev.dev) - tty->driver->minor_start;
+#else
+ line = MINOR(tty->device) - tty->driver.minor_start;
+#endif
+
+ if ((line < 0) || (line >= BCM_NUM_UARTS))
+ return -ENODEV;
+
+ info = lines[line];
+
+ tty->low_latency = 1;
+ info->port->intMask = 0; /* Clear any pending interrupts */
+ info->port->intMask = RXINT; /* Enable RX */
+
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+ enable_brcm_irq(INTERRUPT_ID_UART);
+
+ // Start up serial port
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval)
+ return retval;
+
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+ info->pgrp = process_group(current);
+ info->session = current->signal->session;
+#else
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+#endif
+
+ return 0;
+}
+
+
+static struct tty_operations rs_ops = {
+ .open = bcm63xx_cons_open,
+ .close = bcm63xx_cons_close,
+ .write = bcm63xx_cons_write,
+ .flush_chars = bcm63xx_cons_flush_chars,
+ .write_room = bcm63xx_cons_write_room,
+ .chars_in_buffer = bcm_chars_in_buffer,
+ .flush_buffer = bcm_flush_buffer,
+ .ioctl = bcm_ioctl,
+ .throttle = bcm_throttle,
+ .unthrottle = bcm_unthrottle,
+ .send_xchar = bcm_send_xchar,
+ .set_termios = bcm_set_termios,
+ .stop = bcm_stop,
+ .start = bcm_start,
+ .hangup = bcm_hangup,
+};
+
+/* --------------------------------------------------------------------------
+ Name: bcm63xx_serialinit
+ Purpose: Initialize our BCM63xx serial driver
+-------------------------------------------------------------------------- */
+static int __init bcm63xx_serialinit(void)
+{
+ int i, flags;
+ struct bcm_serial *info;
+
+ // Print the driver version information
+ printk(VER_STR);
+ serial_driver = alloc_tty_driver(BCM_NUM_UARTS);
+ if (!serial_driver)
+ return -ENOMEM;
+
+ serial_driver->owner = THIS_MODULE;
+ serial_driver->name = "ttyS";
+ serial_driver->major = TTY_MAJOR;
+ serial_driver->minor_start = 64;
+ serial_driver->num = 1;
+ 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 = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver->flags = TTY_DRIVER_REAL_RAW;
+
+ serial_driver->termios = serial_termios;
+ serial_driver->termios_locked = serial_termios_locked;
+
+ tty_set_operations(serial_driver, &rs_ops);
+
+ if (tty_register_driver(serial_driver))
+ panic("Couldn't register serial driver\n");
+
+ //save_flags(flags); cli();
+ spin_lock_irqsave(&bcm963xx_serial_lock, flags);
+
+ for (i = 0; i < 1; i++) {
+ info = &multi[i];
+ lines[i] = info;
+ info->magic = SERIAL_MAGIC;
+ info->port = (Uart *) ((char *) UART_BASE + (i * 0x20));
+ info->tty = 0;
+ info->irq = (2 - i) + 8;
+ info->line = i;
+ info->close_delay = 50;
+ info->closing_wait = 3000;
+ info->x_char = 0;
+ info->event = 0;
+ info->count = 0;
+ info->blocked_open = 0;
+ info->normal_termios = serial_driver->init_termios;
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+
+ /* If we are pointing to address zero then punt - not correctly
+ * set up in setup.c to handle this.
+ */
+ if (!info->port)
+ return 0;
+ BcmHalMapInterrupt(bcm_interrupt, 0, INTERRUPT_ID_UART);
+ }
+
+ /* order matters here... the trick is that flags
+ * is updated... in request_irq - to immediatedly obliterate
+ * it is unwise.
+ */
+ spin_unlock_irqrestore(&bcm963xx_serial_lock, flags);
+ return 0;
+}
+
+module_init(bcm63xx_serialinit);
+
+/* --------------------------------------------------------------------------
+ Name: bcm_console_print
+ Purpose: bcm_console_print is registered for printk.
+ The console_lock must be held when we get here.
+-------------------------------------------------------------------------- */
+static void bcm_console_print(struct console *cons, const char *str,
+ unsigned int count)
+{
+ unsigned int i;
+ //_puts(str);
+ for (i = 0; i < count; i++, str++) {
+ _putc(*str);
+ if (*str == 10) {
+ _putc(13);
+ }
+ }
+}
+
+static struct tty_driver *bcm_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return serial_driver;
+}
+
+static int __init bcm_console_setup(struct console *co, char *options)
+{
+ return 0;
+}
+
+static struct console bcm_sercons = {
+ .name = "ttyS",
+ .write = bcm_console_print,
+ .device = bcm_console_device,
+ .setup = bcm_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+static int __init bcm63xx_console_init(void)
+{
+ register_console(&bcm_sercons);
+ return 0;
+}
+
+console_initcall(bcm63xx_console_init);
projects / openwrt.git / commitdiff