zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/tty/serial/68328serial.c b/ap/os/linux/linux-3.4.x/drivers/tty/serial/68328serial.c
new file mode 100644
index 0000000..5ce7825
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/tty/serial/68328serial.c
@@ -0,0 +1,1407 @@
+/* 68328serial.c: Serial port driver for 68328 microcontroller
+ *
+ * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
+ * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
+ * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
+ * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
+ * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
+ * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
+ *
+ * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
+ * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
+ * Power management support Daniel Potts <danielp@cse.unsw.edu.au>
+ * VZ Second Serial Port enable Phil Wilshire
+ * 2.4/2.5 port David McCullough
+ */
+
+#include <asm/dbg.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/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/reboot.h>
+#include <linux/keyboard.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+
+/* (es) */
+/* note: perhaps we can murge these files, so that you can just
+ * define 1 of them, and they can sort that out for themselves
+ */
+#if defined(CONFIG_M68EZ328)
+#include <asm/MC68EZ328.h>
+#else
+#if defined(CONFIG_M68VZ328)
+#include <asm/MC68VZ328.h>
+#else
+#include <asm/MC68328.h>
+#endif /* CONFIG_M68VZ328 */
+#endif /* CONFIG_M68EZ328 */
+
+#include "68328serial.h"
+
+/* Turn off usage of real serial interrupt code, to "support" Copilot */
+#ifdef CONFIG_XCOPILOT_BUGS
+#undef USE_INTS
+#else
+#define USE_INTS
+#endif
+
+static struct m68k_serial m68k_soft[NR_PORTS];
+
+static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
+
+/* multiple ports are contiguous in memory */
+m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
+
+struct tty_struct m68k_ttys;
+struct m68k_serial *m68k_consinfo = 0;
+
+#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
+
+struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging... DEBUG_INTR is bad to use when one of the zs
+ * lines is your console ;(
+ */
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#define RS_ISR_PASS_LIMIT 256
+
+static void change_speed(struct m68k_serial *info);
+
+/*
+ * Setup for console. Argument comes from the boot command line.
+ */
+
+/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
+#ifdef CONFIG_M68VZ328
+#define CONSOLE_BAUD_RATE 19200
+#define DEFAULT_CBAUD B19200
+#endif
+
+
+#ifndef CONSOLE_BAUD_RATE
+#define CONSOLE_BAUD_RATE 9600
+#define DEFAULT_CBAUD B9600
+#endif
+
+
+static int m68328_console_initted = 0;
+static int m68328_console_baud = CONSOLE_BAUD_RATE;
+static int m68328_console_cbaud = DEFAULT_CBAUD;
+
+
+static inline int serial_paranoia_check(struct m68k_serial *info,
+ char *name, 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 m68k_serial for %s in %s\n";
+
+ if (!info) {
+ printk(badinfo, name, routine);
+ return 1;
+ }
+ if (info->magic != SERIAL_MAGIC) {
+ printk(badmagic, name, routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts
+ */
+static int baud_table[] = {
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+ 9600, 19200, 38400, 57600, 115200, 0 };
+
+/* Sets or clears DTR/RTS on the requested line */
+static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
+{
+ if (set) {
+ /* set the RTS/CTS line */
+ } else {
+ /* clear it */
+ }
+ return;
+}
+
+/* Utility routines */
+static inline int get_baud(struct m68k_serial *ss)
+{
+ unsigned long result = 115200;
+ unsigned short int baud = uart_addr[ss->line].ubaud;
+ if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
+ result >>= GET_FIELD(baud, UBAUD_DIVIDE);
+
+ return result;
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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_stop(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_stop"))
+ return;
+
+ local_irq_save(flags);
+ uart->ustcnt &= ~USTCNT_TXEN;
+ local_irq_restore(flags);
+}
+
+static int rs_put_char(char ch)
+{
+ int flags, loops = 0;
+
+ local_irq_save(flags);
+
+ while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
+ loops++;
+ udelay(5);
+ }
+
+ UTX_TXDATA = ch;
+ udelay(5);
+ local_irq_restore(flags);
+ return 1;
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_start"))
+ return;
+
+ local_irq_save(flags);
+ if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
+#ifdef USE_INTS
+ uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+ uart->ustcnt |= USTCNT_TXEN;
+#endif
+ }
+ local_irq_restore(flags);
+}
+
+/* Drop into either the boot monitor or kadb upon receiving a break
+ * from keyboard/console input.
+ */
+static void batten_down_hatches(void)
+{
+ /* Drop into the debugger */
+}
+
+static void status_handle(struct m68k_serial *info, unsigned short status)
+{
+ /* If this is console input and this is a
+ * 'break asserted' status change interrupt
+ * see if we can drop into the debugger
+ */
+ if((status & URX_BREAK) && info->break_abort)
+ batten_down_hatches();
+ return;
+}
+
+static void receive_chars(struct m68k_serial *info, unsigned short rx)
+{
+ struct tty_struct *tty = info->tty;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned char ch, flag;
+
+ /*
+ * This do { } while() loop will get ALL chars out of Rx FIFO
+ */
+#ifndef CONFIG_XCOPILOT_BUGS
+ do {
+#endif
+ ch = GET_FIELD(rx, URX_RXDATA);
+
+ if(info->is_cons) {
+ if(URX_BREAK & rx) { /* whee, break received */
+ status_handle(info, rx);
+ return;
+#ifdef CONFIG_MAGIC_SYSRQ
+ } else if (ch == 0x10) { /* ^P */
+ show_state();
+ show_free_areas(0);
+ show_buffers();
+/* show_net_buffers(); */
+ return;
+ } else if (ch == 0x12) { /* ^R */
+ emergency_restart();
+ return;
+#endif /* CONFIG_MAGIC_SYSRQ */
+ }
+ }
+
+ if(!tty)
+ goto clear_and_exit;
+
+ flag = TTY_NORMAL;
+
+ if(rx & URX_PARITY_ERROR) {
+ flag = TTY_PARITY;
+ status_handle(info, rx);
+ } else if(rx & URX_OVRUN) {
+ flag = TTY_OVERRUN;
+ status_handle(info, rx);
+ } else if(rx & URX_FRAME_ERROR) {
+ flag = TTY_FRAME;
+ status_handle(info, rx);
+ }
+ tty_insert_flip_char(tty, ch, flag);
+#ifndef CONFIG_XCOPILOT_BUGS
+ } while((rx = uart->urx.w) & URX_DATA_READY);
+#endif
+
+ tty_schedule_flip(tty);
+
+clear_and_exit:
+ return;
+}
+
+static void transmit_chars(struct m68k_serial *info)
+{
+ m68328_uart *uart = &uart_addr[info->line];
+
+ if (info->x_char) {
+ /* Send next char */
+ uart->utx.b.txdata = info->x_char;
+ info->x_char = 0;
+ goto clear_and_return;
+ }
+
+ if((info->xmit_cnt <= 0) || info->tty->stopped) {
+ /* That's peculiar... TX ints off */
+ uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+ goto clear_and_return;
+ }
+
+ /* Send char */
+ uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+
+ if(info->xmit_cnt <= 0) {
+ /* All done for now... TX ints off */
+ uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+ goto clear_and_return;
+ }
+
+clear_and_return:
+ /* Clear interrupt (should be auto)*/
+ return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+irqreturn_t rs_interrupt(int irq, void *dev_id)
+{
+ struct m68k_serial *info = dev_id;
+ m68328_uart *uart;
+ unsigned short rx;
+ unsigned short tx;
+
+ uart = &uart_addr[info->line];
+ rx = uart->urx.w;
+
+#ifdef USE_INTS
+ tx = uart->utx.w;
+
+ if (rx & URX_DATA_READY) receive_chars(info, rx);
+ if (tx & UTX_TX_AVAIL) transmit_chars(info);
+#else
+ receive_chars(info, rx);
+#endif
+ return IRQ_HANDLED;
+}
+
+static int startup(struct m68k_serial * info)
+{
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (info->flags & S_INITIALIZED)
+ return 0;
+
+ if (!info->xmit_buf) {
+ info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
+ if (!info->xmit_buf)
+ return -ENOMEM;
+ }
+
+ local_irq_save(flags);
+
+ /*
+ * Clear the FIFO buffers and disable them
+ * (they will be reenabled in change_speed())
+ */
+
+ uart->ustcnt = USTCNT_UEN;
+ info->xmit_fifo_size = 1;
+ uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
+ (void)uart->urx.w;
+
+ /*
+ * Finally, enable sequencing and interrupts
+ */
+#ifdef USE_INTS
+ uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
+ USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
+#else
+ uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
+#endif
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+ /*
+ * and set the speed of the serial port
+ */
+
+ change_speed(info);
+
+ info->flags |= S_INITIALIZED;
+ local_irq_restore(flags);
+ return 0;
+}
+
+/*
+ * 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 m68k_serial * info)
+{
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ uart->ustcnt = 0; /* All off! */
+ if (!(info->flags & S_INITIALIZED))
+ return;
+
+ local_irq_save(flags);
+
+ if (info->xmit_buf) {
+ free_page((unsigned long) info->xmit_buf);
+ info->xmit_buf = 0;
+ }
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~S_INITIALIZED;
+ local_irq_restore(flags);
+}
+
+struct {
+ int divisor, prescale;
+}
+#ifndef CONFIG_M68VZ328
+ hw_baud_table[18] = {
+ {0,0}, /* 0 */
+ {0,0}, /* 50 */
+ {0,0}, /* 75 */
+ {0,0}, /* 110 */
+ {0,0}, /* 134 */
+ {0,0}, /* 150 */
+ {0,0}, /* 200 */
+ {7,0x26}, /* 300 */
+ {6,0x26}, /* 600 */
+ {5,0x26}, /* 1200 */
+ {0,0}, /* 1800 */
+ {4,0x26}, /* 2400 */
+ {3,0x26}, /* 4800 */
+ {2,0x26}, /* 9600 */
+ {1,0x26}, /* 19200 */
+ {0,0x26}, /* 38400 */
+ {1,0x38}, /* 57600 */
+ {0,0x38}, /* 115200 */
+};
+#else
+ hw_baud_table[18] = {
+ {0,0}, /* 0 */
+ {0,0}, /* 50 */
+ {0,0}, /* 75 */
+ {0,0}, /* 110 */
+ {0,0}, /* 134 */
+ {0,0}, /* 150 */
+ {0,0}, /* 200 */
+ {0,0}, /* 300 */
+ {7,0x26}, /* 600 */
+ {6,0x26}, /* 1200 */
+ {0,0}, /* 1800 */
+ {5,0x26}, /* 2400 */
+ {4,0x26}, /* 4800 */
+ {3,0x26}, /* 9600 */
+ {2,0x26}, /* 19200 */
+ {1,0x26}, /* 38400 */
+ {0,0x26}, /* 57600 */
+ {1,0x38}, /* 115200 */
+};
+#endif
+/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct m68k_serial *info)
+{
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned short port;
+ unsigned short ustcnt;
+ unsigned cflag;
+ int i;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ if (!(port = info->port))
+ return;
+
+ ustcnt = uart->ustcnt;
+ uart->ustcnt = ustcnt & ~USTCNT_TXEN;
+
+ i = cflag & CBAUD;
+ if (i & CBAUDEX) {
+ i = (i & ~CBAUDEX) + B38400;
+ }
+
+ info->baud = baud_table[i];
+ uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
+ PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+
+ ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+
+ if ((cflag & CSIZE) == CS8)
+ ustcnt |= USTCNT_8_7;
+
+ if (cflag & CSTOPB)
+ ustcnt |= USTCNT_STOP;
+
+ if (cflag & PARENB)
+ ustcnt |= USTCNT_PARITYEN;
+ if (cflag & PARODD)
+ ustcnt |= USTCNT_ODD_EVEN;
+
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+ if (cflag & CRTSCTS) {
+ uart->utx.w &= ~ UTX_NOCTS;
+ } else {
+ uart->utx.w |= UTX_NOCTS;
+ }
+#endif
+
+ ustcnt |= USTCNT_TXEN;
+
+ uart->ustcnt = ustcnt;
+ return;
+}
+
+/*
+ * Fair output driver allows a process to speak.
+ */
+static void rs_fair_output(void)
+{
+ int left; /* Output no more than that */
+ unsigned long flags;
+ struct m68k_serial *info = &m68k_soft[0];
+ char c;
+
+ if (info == 0) return;
+ if (info->xmit_buf == 0) return;
+
+ local_irq_save(flags);
+ left = info->xmit_cnt;
+ while (left != 0) {
+ c = info->xmit_buf[info->xmit_tail];
+ info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ local_irq_restore(flags);
+
+ rs_put_char(c);
+
+ local_irq_save(flags);
+ left = min(info->xmit_cnt, left-1);
+ }
+
+ /* Last character is being transmitted now (hopefully). */
+ udelay(5);
+
+ local_irq_restore(flags);
+ return;
+}
+
+/*
+ * m68k_console_print is registered for printk.
+ */
+void console_print_68328(const char *p)
+{
+ char c;
+
+ while((c=*(p++)) != 0) {
+ if(c == '\n')
+ rs_put_char('\r');
+ rs_put_char(c);
+ }
+
+ /* Comment this if you want to have a strict interrupt-driven output */
+ rs_fair_output();
+
+ return;
+}
+
+static void rs_set_ldisc(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
+ return;
+
+ info->is_cons = (tty->termios->c_line == N_TTY);
+
+ printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+ return;
+#ifndef USE_INTS
+ for(;;) {
+#endif
+
+ /* Enable transmitter */
+ local_irq_save(flags);
+
+ if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+ !info->xmit_buf) {
+ local_irq_restore(flags);
+ return;
+ }
+
+#ifdef USE_INTS
+ uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+ uart->ustcnt |= USTCNT_TXEN;
+#endif
+
+#ifdef USE_INTS
+ if (uart->utx.w & UTX_TX_AVAIL) {
+#else
+ if (1) {
+#endif
+ /* Send char */
+ uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ }
+
+#ifndef USE_INTS
+ while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+ }
+#endif
+ local_irq_restore(flags);
+}
+
+extern void console_printn(const char * b, int count);
+
+static int rs_write(struct tty_struct * tty,
+ const unsigned char *buf, int count)
+{
+ int c, total = 0;
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write"))
+ return 0;
+
+ if (!tty || !info->xmit_buf)
+ return 0;
+
+ local_save_flags(flags);
+ while (1) {
+ local_irq_disable();
+ c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+ SERIAL_XMIT_SIZE - info->xmit_head));
+ local_irq_restore(flags);
+
+ if (c <= 0)
+ break;
+
+ memcpy(info->xmit_buf + info->xmit_head, buf, c);
+
+ local_irq_disable();
+ info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt += c;
+ local_irq_restore(flags);
+ buf += c;
+ count -= c;
+ total += c;
+ }
+
+ if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
+ /* Enable transmitter */
+ local_irq_disable();
+#ifndef USE_INTS
+ while(info->xmit_cnt) {
+#endif
+
+ uart->ustcnt |= USTCNT_TXEN;
+#ifdef USE_INTS
+ uart->ustcnt |= USTCNT_TX_INTR_MASK;
+#else
+ while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+#endif
+ if (uart->utx.w & UTX_TX_AVAIL) {
+ uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ }
+
+#ifndef USE_INTS
+ }
+#endif
+ local_irq_restore(flags);
+ }
+
+ return total;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ int ret;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+ return 0;
+ ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+ if (ret < 0)
+ ret = 0;
+ return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+ return 0;
+ return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+ return;
+ local_irq_save(flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ local_irq_restore(flags);
+ tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+
+ /* Turn off RTS line (do this atomic) */
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ info->x_char = START_CHAR(tty);
+ }
+
+ /* Assert RTS line (do this atomic) */
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct m68k_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 = info->port;
+ tmp.irq = info->irq;
+ tmp.flags = info->flags;
+ tmp.baud_base = info->baud_base;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+ tmp.custom_divisor = info->custom_divisor;
+ if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int set_serial_info(struct m68k_serial * info,
+ struct serial_struct * new_info)
+{
+ struct serial_struct new_serial;
+ struct m68k_serial old_info;
+ int retval = 0;
+
+ if (!new_info)
+ return -EFAULT;
+ if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+ return -EFAULT;
+ old_info = *info;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ if ((new_serial.baud_base != info->baud_base) ||
+ (new_serial.type != info->type) ||
+ (new_serial.close_delay != info->close_delay) ||
+ ((new_serial.flags & ~S_USR_MASK) !=
+ (info->flags & ~S_USR_MASK)))
+ return -EPERM;
+ info->flags = ((info->flags & ~S_USR_MASK) |
+ (new_serial.flags & S_USR_MASK));
+ info->custom_divisor = new_serial.custom_divisor;
+ goto check_and_exit;
+ }
+
+ 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->flags = ((info->flags & ~S_FLAGS) |
+ (new_serial.flags & S_FLAGS));
+ info->type = new_serial.type;
+ info->close_delay = new_serial.close_delay;
+ info->closing_wait = new_serial.closing_wait;
+
+check_and_exit:
+ 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 m68k_serial * info, unsigned int *value)
+{
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+ m68328_uart *uart = &uart_addr[info->line];
+#endif
+ unsigned char status;
+ unsigned long flags;
+
+ local_irq_save(flags);
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+ status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
+#else
+ status = 0;
+#endif
+ local_irq_restore(flags);
+ return put_user(status, value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(struct m68k_serial * info, unsigned int duration)
+{
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+ if (!info->port)
+ return;
+ local_irq_save(flags);
+#ifdef USE_INTS
+ uart->utx.w |= UTX_SEND_BREAK;
+ msleep_interruptible(duration);
+ uart->utx.w &= ~UTX_SEND_BREAK;
+#endif
+ local_irq_restore(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+ int retval;
+
+ if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+ return -ENODEV;
+
+ 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, 250); /* 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*(100) : 250);
+ return 0;
+ case TIOCGSERIAL:
+ 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 */
+ return get_lsr_info(info, (unsigned int *) arg);
+ case TIOCSERGSTRUCT:
+ if (copy_to_user((struct m68k_serial *) arg,
+ info, sizeof(struct m68k_serial)))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+ struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+ change_speed(info);
+
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_start(tty);
+ }
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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
+ * S structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+ struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+ m68328_uart *uart = &uart_addr[info->line];
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+ return;
+
+ local_irq_save(flags);
+
+ if (tty_hung_up_p(filp)) {
+ local_irq_restore(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("rs_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+ if (--info->count < 0) {
+ printk("rs_close: bad serial port count for ttyS%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+ if (info->count) {
+ local_irq_restore(flags);
+ return;
+ }
+ info->flags |= S_CLOSING;
+ /*
+ * 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 != S_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.
+ */
+
+ uart->ustcnt &= ~USTCNT_RXEN;
+ uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
+
+ shutdown(info);
+ rs_flush_buffer(tty);
+
+ tty_ldisc_flush(tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = NULL;
+#warning "This is not and has never been valid so fix it"
+#if 0
+ if (tty->ldisc.num != ldiscs[N_TTY].num) {
+ if (tty->ldisc.close)
+ (tty->ldisc.close)(tty);
+ tty->ldisc = ldiscs[N_TTY];
+ tty->termios->c_line = N_TTY;
+ if (tty->ldisc.open)
+ (tty->ldisc.open)(tty);
+ }
+#endif
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ msleep_interruptible(jiffies_to_msecs(info->close_delay));
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ local_irq_restore(flags);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void rs_hangup(struct tty_struct *tty)
+{
+ struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+ return;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~S_NORMAL_ACTIVE;
+ info->tty = NULL;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct m68k_serial *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ 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 (info->flags & S_CLOSING) {
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & S_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ info->flags |= S_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ 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, info->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;
+ add_wait_queue(&info->open_wait, &wait);
+
+ info->count--;
+ info->blocked_open++;
+ while (1) {
+ local_irq_disable();
+ m68k_rtsdtr(info, 1);
+ local_irq_enable();
+ current->state = TASK_INTERRUPTIBLE;
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & S_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & S_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & S_CLOSING) && do_clocal)
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+ tty_unlock();
+ schedule();
+ tty_lock();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ info->count++;
+ info->blocked_open--;
+
+ if (retval)
+ return retval;
+ info->flags |= S_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its S structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct m68k_serial *info;
+ int retval;
+
+ info = &m68k_soft[tty->index];
+
+ if (serial_paranoia_check(info, tty->name, "rs_open"))
+ return -ENODEV;
+
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ return block_til_ready(tty, filp, info);
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+ printk("MC68328 serial driver version 1.00\n");
+}
+
+static const struct tty_operations rs_ops = {
+ .open = rs_open,
+ .close = rs_close,
+ .write = rs_write,
+ .flush_chars = rs_flush_chars,
+ .write_room = rs_write_room,
+ .chars_in_buffer = rs_chars_in_buffer,
+ .flush_buffer = rs_flush_buffer,
+ .ioctl = rs_ioctl,
+ .throttle = rs_throttle,
+ .unthrottle = rs_unthrottle,
+ .set_termios = rs_set_termios,
+ .stop = rs_stop,
+ .start = rs_start,
+ .hangup = rs_hangup,
+ .set_ldisc = rs_set_ldisc,
+};
+
+/* rs_init inits the driver */
+static int __init
+rs68328_init(void)
+{
+ int flags, i;
+ struct m68k_serial *info;
+
+ serial_driver = alloc_tty_driver(NR_PORTS);
+ if (!serial_driver)
+ return -ENOMEM;
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+ /* SPARC: Not all of this is exactly right for us. */
+
+ serial_driver->name = "ttyS";
+ serial_driver->major = TTY_MAJOR;
+ serial_driver->minor_start = 64;
+ 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 =
+ m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(serial_driver, &rs_ops);
+
+ if (tty_register_driver(serial_driver)) {
+ put_tty_driver(serial_driver);
+ printk(KERN_ERR "Couldn't register serial driver\n");
+ return -ENOMEM;
+ }
+
+ local_irq_save(flags);
+
+ for(i=0;i<NR_PORTS;i++) {
+
+ info = &m68k_soft[i];
+ info->magic = SERIAL_MAGIC;
+ info->port = (int) &uart_addr[i];
+ info->tty = NULL;
+ info->irq = uart_irqs[i];
+ info->custom_divisor = 16;
+ info->close_delay = 50;
+ info->closing_wait = 3000;
+ info->x_char = 0;
+ info->event = 0;
+ info->count = 0;
+ info->blocked_open = 0;
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ info->line = i;
+ info->is_cons = 1; /* Means shortcuts work */
+
+ printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
+ info->port, info->irq);
+ printk(" is a builtin MC68328 UART\n");
+
+#ifdef CONFIG_M68VZ328
+ if (i > 0 )
+ PJSEL &= 0xCF; /* PSW enable second port output */
+#endif
+
+ if (request_irq(uart_irqs[i],
+ rs_interrupt,
+ 0,
+ "M68328_UART", info))
+ panic("Unable to attach 68328 serial interrupt\n");
+ }
+ local_irq_restore(flags);
+ return 0;
+}
+
+module_init(rs68328_init);
+
+
+
+static void m68328_set_baud(void)
+{
+ unsigned short ustcnt;
+ int i;
+
+ ustcnt = USTCNT;
+ USTCNT = ustcnt & ~USTCNT_TXEN;
+
+again:
+ for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+ if (baud_table[i] == m68328_console_baud)
+ break;
+ if (i >= ARRAY_SIZE(baud_table)) {
+ m68328_console_baud = 9600;
+ goto again;
+ }
+
+ UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
+ PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+ ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+ ustcnt |= USTCNT_8_7;
+ ustcnt |= USTCNT_TXEN;
+ USTCNT = ustcnt;
+ m68328_console_initted = 1;
+ return;
+}
+
+
+int m68328_console_setup(struct console *cp, char *arg)
+{
+ int i, n = CONSOLE_BAUD_RATE;
+
+ if (!cp)
+ return(-1);
+
+ if (arg)
+ n = simple_strtoul(arg,NULL,0);
+
+ for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+ if (baud_table[i] == n)
+ break;
+ if (i < ARRAY_SIZE(baud_table)) {
+ m68328_console_baud = n;
+ m68328_console_cbaud = 0;
+ if (i > 15) {
+ m68328_console_cbaud |= CBAUDEX;
+ i -= 15;
+ }
+ m68328_console_cbaud |= i;
+ }
+
+ m68328_set_baud(); /* make sure baud rate changes */
+ return(0);
+}
+
+
+static struct tty_driver *m68328_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return serial_driver;
+}
+
+
+void m68328_console_write (struct console *co, const char *str,
+ unsigned int count)
+{
+ if (!m68328_console_initted)
+ m68328_set_baud();
+ while (count--) {
+ if (*str == '\n')
+ rs_put_char('\r');
+ rs_put_char( *str++ );
+ }
+}
+
+
+static struct console m68328_driver = {
+ .name = "ttyS",
+ .write = m68328_console_write,
+ .device = m68328_console_device,
+ .setup = m68328_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+
+static int __init m68328_console_init(void)
+{
+ register_console(&m68328_driver);
+ return 0;
+}
+
+console_initcall(m68328_console_init);