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-rw-r--r--target/linux/sibyte/patches/000-DUART.patch1025
1 files changed, 1025 insertions, 0 deletions
diff --git a/target/linux/sibyte/patches/000-DUART.patch b/target/linux/sibyte/patches/000-DUART.patch
new file mode 100644
index 0000000000..468d9dface
--- /dev/null
+++ b/target/linux/sibyte/patches/000-DUART.patch
@@ -0,0 +1,1025 @@
+diff -Nur linux-2.6.21.1/drivers/char/Kconfig linux-2.6.21.1-owrt/drivers/char/Kconfig
+--- linux-2.6.21.1/drivers/char/Kconfig 2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1-owrt/drivers/char/Kconfig 2007-05-24 22:28:54.000000000 +0200
+@@ -386,6 +386,14 @@
+ If you have an Alchemy AU1000 processor (MIPS based) and you want
+ to use a console on a serial port, say Y. Otherwise, say N.
+
++config SIBYTE_SB1250_DUART
++ bool "Support for BCM1xxx onchip DUART"
++ depends on MIPS && SIBYTE_SB1xxx_SOC=y
++
++config SIBYTE_SB1250_DUART_CONSOLE
++ bool "Console on BCM1xxx DUART"
++ depends on SIBYTE_SB1250_DUART
++
+ config SERIAL_DEC
+ bool "DECstation serial support"
+ depends on MACH_DECSTATION
+diff -Nur linux-2.6.21.1/drivers/char/Makefile linux-2.6.21.1-owrt/drivers/char/Makefile
+--- linux-2.6.21.1/drivers/char/Makefile 2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1-owrt/drivers/char/Makefile 2007-05-24 22:32:31.000000000 +0200
+@@ -32,6 +32,7 @@
+ obj-$(CONFIG_ATARI_DSP56K) += dsp56k.o
+ obj-$(CONFIG_MOXA_SMARTIO) += mxser.o
+ obj-$(CONFIG_MOXA_SMARTIO_NEW) += mxser_new.o
++obj-$(CONFIG_SIBYTE_SB1250_DUART) += sb1250_duart.o
+ obj-$(CONFIG_COMPUTONE) += ip2/
+ obj-$(CONFIG_RISCOM8) += riscom8.o
+ obj-$(CONFIG_ISI) += isicom.o
+diff -Nur linux-2.6.21.1/drivers/char/sb1250_duart.c linux-2.6.21.1-owrt/drivers/char/sb1250_duart.c
+--- linux-2.6.21.1/drivers/char/sb1250_duart.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1-owrt/drivers/char/sb1250_duart.c 2007-05-24 22:10:12.000000000 +0200
+@@ -0,0 +1,979 @@
++/*
++ * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2
++ * of the License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that 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.
++ */
++
++/*
++ * Driver support for the on-chip sb1250 dual-channel serial port,
++ * running in asynchronous mode. Also, support for doing a serial console
++ * on one of those ports
++ */
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/serial.h>
++#include <linux/interrupt.h>
++#include <linux/module.h>
++#include <linux/console.h>
++#include <linux/kdev_t.h>
++#include <linux/major.h>
++#include <linux/termios.h>
++#include <linux/spinlock.h>
++#include <linux/irq.h>
++#include <linux/errno.h>
++#include <linux/tty.h>
++#include <linux/sched.h>
++#include <linux/tty_flip.h>
++#include <linux/timer.h>
++#include <linux/init.h>
++#include <linux/mm.h>
++#include <asm/delay.h>
++#include <asm/io.h>
++#include <asm/uaccess.h>
++#include <asm/sibyte/swarm.h>
++#include <asm/sibyte/sb1250.h>
++#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
++#include <asm/sibyte/bcm1480_regs.h>
++#include <asm/sibyte/bcm1480_int.h>
++#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
++#include <asm/sibyte/sb1250_regs.h>
++#include <asm/sibyte/sb1250_int.h>
++#else
++#error invalid SiByte UART configuation
++#endif
++#include <asm/sibyte/sb1250_uart.h>
++#include <asm/war.h>
++
++#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
++#define UNIT_CHANREG(n,reg) A_BCM1480_DUART_CHANREG((n),(reg))
++#define UNIT_IMRREG(n) A_BCM1480_DUART_IMRREG(n)
++#define UNIT_INT(n) (K_BCM1480_INT_UART_0 + (n))
++#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
++#define UNIT_CHANREG(n,reg) A_DUART_CHANREG((n),(reg))
++#define UNIT_IMRREG(n) A_DUART_IMRREG(n)
++#define UNIT_INT(n) (K_INT_UART_0 + (n))
++#else
++#error invalid SiByte UART configuation
++#endif
++
++/* Toggle spewing of debugging output */
++#undef DEBUG
++
++#define DEFAULT_CFLAGS (CS8 | B115200)
++
++#define TX_INTEN 1
++#define DUART_INITIALIZED 2
++
++#define DUART_MAX_LINE 4
++char sb1250_duart_present[DUART_MAX_LINE];
++EXPORT_SYMBOL(sb1250_duart_present);
++
++/*
++ * In bug 1956, we get glitches that can mess up uart registers. This
++ * "read-mode-reg after any register access" is an accepted workaround.
++ */
++#if SIBYTE_1956_WAR
++# define SB1_SER1956_WAR { \
++ u32 ignore; \
++ ignore = csr_in32(uart_states[line].mode_1); \
++ ignore = csr_in32(uart_states[line].mode_2); \
++ }
++#else
++# define SB1_SER1956_WAR
++#endif
++
++/*
++ * Still not sure what the termios structures set up here are for,
++ * but we have to supply pointers to them to register the tty driver
++ */
++static struct tty_driver *sb1250_duart_driver; //, sb1250_duart_callout_driver;
++
++/*
++ * This lock protects both the open flags for all the uart states as
++ * well as the reference count for the module
++ */
++static DEFINE_SPINLOCK(open_lock);
++
++typedef struct {
++ unsigned char outp_buf[SERIAL_XMIT_SIZE];
++ unsigned int outp_head;
++ unsigned int outp_tail;
++ unsigned int outp_count;
++ spinlock_t outp_lock;
++ unsigned int open;
++ unsigned int line;
++ unsigned int last_cflags;
++ unsigned long flags;
++ struct tty_struct *tty;
++
++ /* CSR addresses */
++ unsigned int *status;
++ unsigned int *imr;
++ unsigned int *tx_hold;
++ unsigned int *rx_hold;
++ unsigned int *mode_1;
++ unsigned int *mode_2;
++ unsigned int *clk_sel;
++ unsigned int *cmd;
++} uart_state_t;
++
++static uart_state_t uart_states[DUART_MAX_LINE];
++
++/*
++ * Inline functions local to this module
++ */
++
++static inline u32 READ_SERCSR(volatile u32 *addr, int line)
++{
++ u32 val = csr_in32(addr);
++ SB1_SER1956_WAR;
++ return val;
++}
++
++static inline void WRITE_SERCSR(u32 val, volatile u32 *addr, int line)
++{
++ csr_out32(val, addr);
++ SB1_SER1956_WAR;
++}
++
++static void init_duart_port(uart_state_t *port, int line)
++{
++ if (!(port->flags & DUART_INITIALIZED)) {
++ port->line = line;
++ port->status = IOADDR(UNIT_CHANREG(line, R_DUART_STATUS));
++ port->imr = IOADDR(UNIT_IMRREG(line));
++ port->tx_hold = IOADDR(UNIT_CHANREG(line, R_DUART_TX_HOLD));
++ port->rx_hold = IOADDR(UNIT_CHANREG(line, R_DUART_RX_HOLD));
++ port->mode_1 = IOADDR(UNIT_CHANREG(line, R_DUART_MODE_REG_1));
++ port->mode_2 = IOADDR(UNIT_CHANREG(line, R_DUART_MODE_REG_2));
++ port->clk_sel = IOADDR(UNIT_CHANREG(line, R_DUART_CLK_SEL));
++ port->cmd = IOADDR(UNIT_CHANREG(line, R_DUART_CMD));
++ port->last_cflags = DEFAULT_CFLAGS;
++ spin_lock_init(&port->outp_lock);
++ port->flags |= DUART_INITIALIZED;
++ }
++}
++
++/*
++ * Mask out the passed interrupt lines at the duart level. This should be
++ * called while holding the associated outp_lock.
++ */
++static inline void duart_mask_ints(unsigned int line, unsigned int mask)
++{
++ uart_state_t *port = uart_states + line;
++ u64 tmp = READ_SERCSR(port->imr, line);
++ WRITE_SERCSR(tmp & ~mask, port->imr, line);
++}
++
++
++/* Unmask the passed interrupt lines at the duart level */
++static inline void duart_unmask_ints(unsigned int line, unsigned int mask)
++{
++ uart_state_t *port = uart_states + line;
++ u64 tmp = READ_SERCSR(port->imr, line);
++ WRITE_SERCSR(tmp | mask, port->imr, line);
++}
++
++static inline void transmit_char_pio(uart_state_t *us)
++{
++ struct tty_struct *tty = us->tty;
++ int blocked = 0;
++
++ if (spin_trylock(&us->outp_lock)) {
++ for (;;) {
++ if (!(READ_SERCSR(us->status, us->line) & M_DUART_TX_RDY))
++ break;
++ if (us->outp_count <= 0 || tty->stopped || tty->hw_stopped) {
++ break;
++ } else {
++ WRITE_SERCSR(us->outp_buf[us->outp_head],
++ us->tx_hold, us->line);
++ us->outp_head = (us->outp_head + 1) & (SERIAL_XMIT_SIZE-1);
++ if (--us->outp_count <= 0)
++ break;
++ }
++ udelay(10);
++ }
++ spin_unlock(&us->outp_lock);
++ } else {
++ blocked = 1;
++ }
++
++ if (!us->outp_count || tty->stopped ||
++ tty->hw_stopped || blocked) {
++ us->flags &= ~TX_INTEN;
++ duart_mask_ints(us->line, M_DUART_IMR_TX);
++ }
++
++ if (us->open &&
++ (us->outp_count < (SERIAL_XMIT_SIZE/2))) {
++ /*
++ * We told the discipline at one point that we had no
++ * space, so it went to sleep. Wake it up when we hit
++ * half empty
++ */
++ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
++ tty->ldisc.write_wakeup)
++ tty->ldisc.write_wakeup(tty);
++ wake_up_interruptible(&tty->write_wait);
++ }
++}
++
++/*
++ * Generic interrupt handler for both channels. dev_id is a pointer
++ * to the proper uart_states structure, so from that we can derive
++ * which port interrupted
++ */
++
++static irqreturn_t duart_int(int irq, void *dev_id)
++{
++ uart_state_t *us = (uart_state_t *)dev_id;
++ struct tty_struct *tty = us->tty;
++ unsigned int status = READ_SERCSR(us->status, us->line);
++
++ pr_debug("DUART INT\n");
++
++ if (status & M_DUART_RX_RDY) {
++ int counter = 2048;
++ unsigned int ch;
++
++ if (status & M_DUART_OVRUN_ERR)
++ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
++ if (status & M_DUART_PARITY_ERR) {
++ printk("Parity error!\n");
++ } else if (status & M_DUART_FRM_ERR) {
++ printk("Frame error!\n");
++ }
++
++ while (counter > 0) {
++ if (!(READ_SERCSR(us->status, us->line) & M_DUART_RX_RDY))
++ break;
++ ch = READ_SERCSR(us->rx_hold, us->line);
++ tty_insert_flip_char(tty, ch, 0);
++ udelay(1);
++ counter--;
++ }
++ tty_flip_buffer_push(tty);
++ }
++
++ if (status & M_DUART_TX_RDY) {
++ transmit_char_pio(us);
++ }
++
++ return IRQ_HANDLED;
++}
++
++/*
++ * Actual driver functions
++ */
++
++/* Return the number of characters we can accomodate in a write at this instant */
++static int duart_write_room(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ int retval;
++
++ retval = SERIAL_XMIT_SIZE - us->outp_count;
++
++ pr_debug("duart_write_room called, returning %i\n", retval);
++
++ return retval;
++}
++
++/* memcpy the data from src to destination, but take extra care if the
++ data is coming from user space */
++static inline int copy_buf(char *dest, const char *src, int size, int from_user)
++{
++ if (from_user) {
++ (void) copy_from_user(dest, src, size);
++ } else {
++ memcpy(dest, src, size);
++ }
++ return size;
++}
++
++/*
++ * Buffer up to count characters from buf to be written. If we don't have
++ * other characters buffered, enable the tx interrupt to start sending
++ */
++static int duart_write(struct tty_struct *tty, const unsigned char *buf,
++ int count)
++{
++ uart_state_t *us;
++ int c, t, total = 0;
++ unsigned long flags;
++
++ if (!tty) return 0;
++
++ us = tty->driver_data;
++ if (!us) return 0;
++
++ pr_debug("duart_write called for %i chars by %i (%s)\n", count,
++ current->pid, current->comm);
++
++ spin_lock_irqsave(&us->outp_lock, flags);
++
++ for (;;) {
++ c = count;
++
++ t = SERIAL_XMIT_SIZE - us->outp_tail;
++ if (t < c) c = t;
++
++ t = SERIAL_XMIT_SIZE - 1 - us->outp_count;
++ if (t < c) c = t;
++
++ if (c <= 0) break;
++
++ memcpy(us->outp_buf + us->outp_tail, buf, c);
++
++ us->outp_count += c;
++ us->outp_tail = (us->outp_tail + c) & (SERIAL_XMIT_SIZE - 1);
++ buf += c;
++ count -= c;
++ total += c;
++ }
++
++ spin_unlock_irqrestore(&us->outp_lock, flags);
++
++ if (us->outp_count && !tty->stopped &&
++ !tty->hw_stopped && !(us->flags & TX_INTEN)) {
++ us->flags |= TX_INTEN;
++ duart_unmask_ints(us->line, M_DUART_IMR_TX);
++ }
++
++ return total;
++}
++
++
++/* Buffer one character to be written. If there's not room for it, just drop
++ it on the floor. This is used for echo, among other things */
++static void duart_put_char(struct tty_struct *tty, u_char ch)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ unsigned long flags;
++
++ pr_debug("duart_put_char called. Char is %x (%c)\n", (int)ch, ch);
++
++ spin_lock_irqsave(&us->outp_lock, flags);
++
++ if (us->outp_count == SERIAL_XMIT_SIZE) {
++ spin_unlock_irqrestore(&us->outp_lock, flags);
++ return;
++ }
++
++ us->outp_buf[us->outp_tail] = ch;
++ us->outp_tail = (us->outp_tail + 1) &(SERIAL_XMIT_SIZE-1);
++ us->outp_count++;
++
++ spin_unlock_irqrestore(&us->outp_lock, flags);
++}
++
++static void duart_flush_chars(struct tty_struct * tty)
++{
++ uart_state_t *port;
++
++ if (!tty)
++ return;
++
++ port = tty->driver_data;
++
++ if (!port)
++ return;
++
++ if (port->outp_count <= 0 || tty->stopped || tty->hw_stopped) {
++ return;
++ }
++
++ port->flags |= TX_INTEN;
++ duart_unmask_ints(port->line, M_DUART_IMR_TX);
++}
++
++/* Return the number of characters in the output buffer that have yet to be
++ written */
++static int duart_chars_in_buffer(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ int retval;
++
++ retval = us->outp_count;
++
++ pr_debug("duart_chars_in_buffer returning %i\n", retval);
++
++ return retval;
++}
++
++/* Kill everything we haven't yet shoved into the FIFO. Turn off the
++ transmit interrupt since we've nothing more to transmit */
++static void duart_flush_buffer(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ unsigned long flags;
++
++ pr_debug("duart_flush_buffer called\n");
++ spin_lock_irqsave(&us->outp_lock, flags);
++ us->outp_head = us->outp_tail = us->outp_count = 0;
++ spin_unlock_irqrestore(&us->outp_lock, flags);
++
++ wake_up_interruptible(&us->tty->write_wait);
++ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
++ tty->ldisc.write_wakeup)
++ tty->ldisc.write_wakeup(tty);
++}
++
++
++/* See sb1250 user manual for details on these registers */
++static inline void duart_set_cflag(unsigned int line, unsigned int cflag)
++{
++ unsigned int mode_reg1 = 0, mode_reg2 = 0;
++ unsigned int clk_divisor;
++ uart_state_t *port = uart_states + line;
++
++ switch (cflag & CSIZE) {
++ case CS7:
++ mode_reg1 |= V_DUART_BITS_PER_CHAR_7;
++
++ default:
++ /* We don't handle CS5 or CS6...is there a way we're supposed to
++ * flag this? right now we just force them to CS8 */
++ mode_reg1 |= 0x0;
++ break;
++ }
++ if (cflag & CSTOPB) {
++ mode_reg2 |= M_DUART_STOP_BIT_LEN_2;
++ }
++ if (!(cflag & PARENB)) {
++ mode_reg1 |= V_DUART_PARITY_MODE_NONE;
++ }
++ if (cflag & PARODD) {
++ mode_reg1 |= M_DUART_PARITY_TYPE_ODD;
++ }
++
++ /* Formula for this is (5000000/baud)-1, but we saturate
++ at 12 bits, which means we can't actually do anything less
++ that 1200 baud */
++ switch (cflag & CBAUD) {
++ case B200:
++ case B300:
++ case B1200: clk_divisor = 4095; break;
++ case B1800: clk_divisor = 2776; break;
++ case B2400: clk_divisor = 2082; break;
++ case B4800: clk_divisor = 1040; break;
++ case B9600: clk_divisor = 519; break;
++ case B19200: clk_divisor = 259; break;
++ case B38400: clk_divisor = 129; break;
++ default:
++ case B57600: clk_divisor = 85; break;
++ case B115200: clk_divisor = 42; break;
++ }
++ WRITE_SERCSR(mode_reg1, port->mode_1, port->line);
++ WRITE_SERCSR(mode_reg2, port->mode_2, port->line);
++ WRITE_SERCSR(clk_divisor, port->clk_sel, port->line);
++ port->last_cflags = cflag;
++}
++
++
++/* Handle notification of a termios change. */
++static void duart_set_termios(struct tty_struct *tty, struct termios *old)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++
++ pr_debug("duart_set_termios called by %i (%s)\n", current->pid,
++ current->comm);
++ if (old && tty->termios->c_cflag == old->c_cflag)
++ return;
++ duart_set_cflag(us->line, tty->termios->c_cflag);
++}
++
++static int get_serial_info(uart_state_t *us, struct serial_struct * retinfo)
++{
++ struct serial_struct tmp;
++
++ memset(&tmp, 0, sizeof(tmp));
++
++ tmp.type = PORT_SB1250;
++ tmp.line = us->line;
++ tmp.port = UNIT_CHANREG(tmp.line,0);
++ tmp.irq = UNIT_INT(tmp.line);
++ tmp.xmit_fifo_size = 16; /* fixed by hw */
++ tmp.baud_base = 5000000;
++ tmp.io_type = SERIAL_IO_MEM;
++
++ if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
++ return -EFAULT;
++
++ return 0;
++}
++
++static int duart_ioctl(struct tty_struct *tty, struct file * file,
++ unsigned int cmd, unsigned long arg)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++
++/* if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
++ return -ENODEV;*/
++ switch (cmd) {
++ case TIOCMGET:
++ printk("Ignoring TIOCMGET\n");
++ break;
++ case TIOCMBIS:
++ printk("Ignoring TIOCMBIS\n");
++ break;
++ case TIOCMBIC:
++ printk("Ignoring TIOCMBIC\n");
++ break;
++ case TIOCMSET:
++ printk("Ignoring TIOCMSET\n");
++ break;
++ case TIOCGSERIAL:
++ return get_serial_info(us,(struct serial_struct *) arg);
++ case TIOCSSERIAL:
++ printk("Ignoring TIOCSSERIAL\n");
++ break;
++ case TIOCSERCONFIG:
++ printk("Ignoring TIOCSERCONFIG\n");
++ break;
++ case TIOCSERGETLSR: /* Get line status register */
++ printk("Ignoring TIOCSERGETLSR\n");
++ break;
++ case TIOCSERGSTRUCT:
++ printk("Ignoring TIOCSERGSTRUCT\n");
++ break;
++ case TIOCMIWAIT:
++ printk("Ignoring TIOCMIWAIT\n");
++ break;
++ case TIOCGICOUNT:
++ printk("Ignoring TIOCGICOUNT\n");
++ break;
++ case TIOCSERGWILD:
++ printk("Ignoring TIOCSERGWILD\n");
++ break;
++ case TIOCSERSWILD:
++ printk("Ignoring TIOCSERSWILD\n");
++ break;
++ default:
++ break;
++ }
++// printk("Ignoring IOCTL %x from pid %i (%s)\n", cmd, current->pid, current->comm);
++ return -ENOIOCTLCMD;
++}
++
++/* XXXKW locking? */
++static void duart_start(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++
++ pr_debug("duart_start called\n");
++
++ if (us->outp_count && !(us->flags & TX_INTEN)) {
++ us->flags |= TX_INTEN;
++ duart_unmask_ints(us->line, M_DUART_IMR_TX);
++ }
++}
++
++/* XXXKW locking? */
++static void duart_stop(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++
++ pr_debug("duart_stop called\n");
++
++ if (us->outp_count && (us->flags & TX_INTEN)) {
++ us->flags &= ~TX_INTEN;
++ duart_mask_ints(us->line, M_DUART_IMR_TX);
++ }
++}
++
++/* Not sure on the semantics of this; are we supposed to wait until the stuff
++ * already in the hardware FIFO drains, or are we supposed to wait until
++ * we've drained the output buffer, too? I'm assuming the former, 'cause thats
++ * what the other drivers seem to assume
++ */
++
++static void duart_wait_until_sent(struct tty_struct *tty, int timeout)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ unsigned long orig_jiffies;
++
++ orig_jiffies = jiffies;
++ pr_debug("duart_wait_until_sent(%d)+\n", timeout);
++ while (!(READ_SERCSR(us->status, us->line) & M_DUART_TX_EMT)) {
++ set_current_state(TASK_INTERRUPTIBLE);
++ schedule_timeout(1);
++ if (signal_pending(current))
++ break;
++ if (timeout && time_after(jiffies, orig_jiffies + timeout))
++ break;
++ }
++ pr_debug("duart_wait_until_sent()-\n");
++}
++
++/*
++ * duart_hangup() --- called by tty_hangup() when a hangup is signaled.
++ */
++static void duart_hangup(struct tty_struct *tty)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++
++ duart_flush_buffer(tty);
++ us->open = 0;
++ us->tty = 0;
++}
++
++/*
++ * Open a tty line. Note that this can be called multiple times, so ->open can
++ * be >1. Only set up the tty struct if this is a "new" open, e.g. ->open was
++ * zero
++ */
++static int duart_open(struct tty_struct *tty, struct file *filp)
++{
++ uart_state_t *us;
++ unsigned int line = tty->index;
++ unsigned long flags;
++
++ if ((line >= tty->driver->num) || !sb1250_duart_present[line])
++ return -ENODEV;
++
++ pr_debug("duart_open called by %i (%s), tty is %p, rw is %p, ww is %p\n",
++ current->pid, current->comm, tty, (void *)&tty->read_wait,
++ (void *)&tty->write_wait);
++
++ us = uart_states + line;
++ tty->driver_data = us;
++
++ spin_lock_irqsave(&open_lock, flags);
++ if (!us->open) {
++ us->tty = tty;
++ us->tty->termios->c_cflag = us->last_cflags;
++ }
++ us->open++;
++ us->flags &= ~TX_INTEN;
++ duart_unmask_ints(line, M_DUART_IMR_RX);
++ spin_unlock_irqrestore(&open_lock, flags);
++
++ return 0;
++}
++
++
++/*
++ * Close a reference count out. If reference count hits zero, null the
++ * tty, kill the interrupts. The tty_io driver is responsible for making
++ * sure we've cleared out our internal buffers before calling close()
++ */
++static void duart_close(struct tty_struct *tty, struct file *filp)
++{
++ uart_state_t *us = (uart_state_t *) tty->driver_data;
++ unsigned long flags;
++
++ pr_debug("duart_close called by %i (%s)\n", current->pid, current->comm);
++
++ if (!us || !us->open)
++ return;
++
++ spin_lock_irqsave(&open_lock, flags);
++ if (tty_hung_up_p(filp)) {
++ spin_unlock_irqrestore(&open_lock, flags);
++ return;
++ }
++
++ if (--us->open < 0) {
++ us->open = 0;
++ printk(KERN_ERR "duart: bad open count: %d\n", us->open);
++ }
++ if (us->open) {
++ spin_unlock_irqrestore(&open_lock, flags);
++ return;
++ }
++
++ spin_unlock_irqrestore(&open_lock, flags);
++
++ tty->closing = 1;
++
++ /* Stop accepting input */
++ duart_mask_ints(us->line, M_DUART_IMR_RX);
++ /* Wait for FIFO to drain */
++ while (!(READ_SERCSR(us->status, us->line) & M_DUART_TX_EMT))
++ ;
++
++ if (tty->driver->flush_buffer)
++ tty->driver->flush_buffer(tty);
++ if (tty->ldisc.flush_buffer)
++ tty->ldisc.flush_buffer(tty);
++ tty->closing = 0;
++}
++
++
++static struct tty_operations duart_ops = {
++ .open = duart_open,
++ .close = duart_close,
++ .write = duart_write,
++ .put_char = duart_put_char,
++ .flush_chars = duart_flush_chars,
++ .write_room = duart_write_room,
++ .chars_in_buffer = duart_chars_in_buffer,
++ .flush_buffer = duart_flush_buffer,
++ .ioctl = duart_ioctl,
++// .throttle = duart_throttle,
++// .unthrottle = duart_unthrottle,
++ .set_termios = duart_set_termios,
++ .stop = duart_stop,
++ .start = duart_start,
++ .hangup = duart_hangup,
++ .wait_until_sent = duart_wait_until_sent,
++};
++
++/* Initialize the sb1250_duart_present array based on SOC type. */
++static void __init sb1250_duart_init_present_lines(void)
++{
++ int i, max_lines;
++
++ /* Set the number of available units based on the SOC type. */
++ switch (soc_type) {
++ case K_SYS_SOC_TYPE_BCM1x55:
++ case K_SYS_SOC_TYPE_BCM1x80:
++ max_lines = 4;
++ break;
++ default:
++ /* Assume at least two serial ports at the normal address. */
++ max_lines = 2;
++ break;
++ }
++ if (max_lines > DUART_MAX_LINE)
++ max_lines = DUART_MAX_LINE;
++
++ for (i = 0; i < max_lines; i++)
++ sb1250_duart_present[i] = 1;
++}
++
++/* Set up the driver and register it, register the UART interrupts. This
++ is called from tty_init, or as a part of the module init */
++static int __init sb1250_duart_init(void)
++{
++ int i;
++
++ sb1250_duart_init_present_lines();
++
++ sb1250_duart_driver = alloc_tty_driver(DUART_MAX_LINE);
++ if (!sb1250_duart_driver)
++ return -ENOMEM;
++
++ sb1250_duart_driver->owner = THIS_MODULE;
++ sb1250_duart_driver->name = "duart";
++ sb1250_duart_driver->major = TTY_MAJOR;
++ sb1250_duart_driver->minor_start = SB1250_DUART_MINOR_BASE;
++ sb1250_duart_driver->type = TTY_DRIVER_TYPE_SERIAL;
++ sb1250_duart_driver->subtype = SERIAL_TYPE_NORMAL;
++ sb1250_duart_driver->init_termios = tty_std_termios;
++ sb1250_duart_driver->flags = TTY_DRIVER_REAL_RAW;
++ tty_set_operations(sb1250_duart_driver, &duart_ops);
++
++ for (i = 0; i < DUART_MAX_LINE; i++) {
++ uart_state_t *port = uart_states + i;
++
++ if (!sb1250_duart_present[i])
++ continue;
++
++ init_duart_port(port, i);
++ duart_mask_ints(i, M_DUART_IMR_ALL);
++ if (request_irq(UNIT_INT(i), duart_int, 0, "uart", port)) {
++ panic("Couldn't get uart0 interrupt line");
++ }
++ /*
++ * this generic write to a register does not implement the 1956
++ * WAR and sometimes output gets corrupted afterwards,
++ * especially if the port was in use as a console.
++ */
++ __raw_writel(M_DUART_RX_EN|M_DUART_TX_EN, port->cmd);
++
++ /*
++ * we should really check to see if it's registered as a console
++ * before trashing those settings
++ */
++ duart_set_cflag(i, port->last_cflags);
++ }
++
++ /* Interrupts are now active, our ISR can be called. */
++
++ if (tty_register_driver(sb1250_duart_driver)) {
++ printk(KERN_ERR "Couldn't register sb1250 duart serial driver\n");
++ put_tty_driver(sb1250_duart_driver);
++ return 1;
++ }
++ return 0;
++}
++
++/* Unload the driver. Unregister stuff, get ready to go away */
++static void __exit sb1250_duart_fini(void)
++{
++ unsigned long flags;
++ int i;
++
++ local_irq_save(flags);
++ tty_unregister_driver(sb1250_duart_driver);
++ put_tty_driver(sb1250_duart_driver);
++
++ for (i = 0; i < DUART_MAX_LINE; i++) {
++ if (!sb1250_duart_present[i])
++ continue;
++ free_irq(UNIT_INT(i), &uart_states[i]);
++ disable_irq(UNIT_INT(i));
++ }
++ local_irq_restore(flags);
++}
++
++module_init(sb1250_duart_init);
++module_exit(sb1250_duart_fini);
++MODULE_DESCRIPTION("SB1250 Duart serial driver");
++MODULE_AUTHOR("Broadcom Corp.");
++
++#ifdef CONFIG_SIBYTE_SB1250_DUART_CONSOLE
++
++/*
++ * Serial console stuff. Very basic, polling driver for doing serial
++ * console output. The console_sem is held by the caller, so we
++ * shouldn't be interrupted for more console activity.
++ * XXXKW What about getting interrupted by uart driver activity?
++ */
++
++void serial_outc(unsigned char c, int line)
++{
++ uart_state_t *port = uart_states + line;
++ while (!(READ_SERCSR(port->status, line) & M_DUART_TX_RDY)) ;
++ WRITE_SERCSR(c, port->tx_hold, line);
++ while (!(READ_SERCSR(port->status, port->line) & M_DUART_TX_EMT)) ;
++}
++
++static void ser_console_write(struct console *cons, const char *s,
++ unsigned int count)
++{
++ int line = cons->index;
++ uart_state_t *port = uart_states + line;
++ u32 imr;
++
++ imr = READ_SERCSR(port->imr, line);
++ WRITE_SERCSR(0, port->imr, line);
++ while (count--) {
++ if (*s == '\n')
++ serial_outc('\r', line);
++ serial_outc(*s++, line);
++ }
++ WRITE_SERCSR(imr, port->imr, line);
++}
++
++static struct tty_driver *ser_console_device(struct console *c, int *index)
++{
++ *index = c->index;
++ return sb1250_duart_driver;
++}
++
++static int ser_console_setup(struct console *cons, char *str)
++{
++ int i;
++
++ sb1250_duart_init_present_lines();
++
++ for (i = 0; i < DUART_MAX_LINE; i++) {
++ uart_state_t *port = uart_states + i;
++ u32 cflags = DEFAULT_CFLAGS;
++
++ if (!sb1250_duart_present[i])
++ continue;
++
++ init_duart_port(port, i);
++ if (str) {
++ int speed;
++ char par = 'n';
++ int cbits = 8;
++
++ cflags = 0;
++
++ /*
++ * format is in Documentation/serial_console.txt
++ */
++ sscanf(str, "%d%c%d", &speed, &par, &cbits);
++
++ switch (speed) {
++ case 200:
++ case 300:
++ case 1200:
++ cflags |= B1200;
++ break;
++ case 1800:
++ cflags |= B1800;
++ break;
++ case 2400:
++ cflags |= B2400;
++ break;
++ case 4800:
++ cflags |= B4800;
++ break;
++ default:
++ case 9600:
++ cflags |= B9600;
++ break;
++ case 19200:
++ cflags |= B19200;
++ break;
++ case 38400:
++ cflags |= B38400;
++ break;
++ case 57600:
++ cflags |= B57600;
++ break;
++ case 115200:
++ cflags |= B115200;
++ break;
++ }
++ switch (par) {
++ case 'o':
++ cflags |= PARODD;
++ case 'e':
++ cflags |= PARENB;
++ }
++ switch (cbits) {
++ default: // we only do 7 or 8
++ case 8:
++ cflags |= CS8;
++ break;
++ case 7:
++ cflags |= CS7;
++ break;
++ }
++ }
++ duart_set_cflag(i, cflags);
++ WRITE_SERCSR(M_DUART_RX_EN | M_DUART_TX_EN, port->cmd, i);
++ }
++
++ return 0;
++}
++
++static struct console sb1250_ser_cons = {
++ .name = "duart",
++ .write = ser_console_write,
++ .device = ser_console_device,
++ .setup = ser_console_setup,
++ .flags = CON_PRINTBUFFER,
++ .index = -1,
++};
++
++static int __init sb1250_serial_console_init(void)
++{
++ //add_preferred_console("duart", 0, "57600n8");
++ register_console(&sb1250_ser_cons);
++ return 0;
++}
++
++console_initcall(sb1250_serial_console_init);
++
++#endif /* CONFIG_SIBYTE_SB1250_DUART_CONSOLE */
+diff -Nur linux-2.6.21.1/include/linux/serial.h linux-2.6.21.1-owrt/include/linux/serial.h
+--- linux-2.6.21.1/include/linux/serial.h 2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1-owrt/include/linux/serial.h 2007-05-24 22:10:29.000000000 +0200
+@@ -76,7 +76,8 @@
+ #define PORT_16654 11
+ #define PORT_16850 12
+ #define PORT_RSA 13 /* RSA-DV II/S card */
+-#define PORT_MAX 13
++#define PORT_SB1250 14
++#define PORT_MAX 14
+
+ #define SERIAL_IO_PORT 0
+ #define SERIAL_IO_HUB6 1
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 20:57:20 +0000