Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c
new file mode 100644
index 0000000..8c40167
--- /dev/null
+++ b/drivers/serial/mcfserial.c
@@ -0,0 +1,1883 @@
+/*
+ * mcfserial.c -- serial driver for ColdFire internal UARTS.
+ *
+ * Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
+ * Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com>
+ * Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com>
+ *
+ * Based on code from 68332serial.c which was:
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1998 TSHG
+ * Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
+ *
+ * Changes:
+ * 08/07/2003 Daniele Bellucci <bellucda@tiscali.it>
+ * some cleanups in mcfrs_write.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/semaphore.h>
+#include <asm/delay.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfuart.h>
+#include <asm/nettel.h>
+#include <asm/uaccess.h>
+#include "mcfserial.h"
+
+struct timer_list mcfrs_timer_struct;
+
+/*
+ * Default console baud rate, we use this as the default
+ * for all ports so init can just open /dev/console and
+ * keep going. Perhaps one day the cflag settings for the
+ * console can be used instead.
+ */
+#if defined(CONFIG_ARNEWSH) || defined(CONFIG_MOTOROLA) || defined(CONFIG_senTec) || defined(CONFIG_SNEHA)
+#define CONSOLE_BAUD_RATE 19200
+#define DEFAULT_CBAUD B19200
+#endif
+
+#if defined(CONFIG_HW_FEITH)
+ #define CONSOLE_BAUD_RATE 38400
+ #define DEFAULT_CBAUD B38400
+#endif
+
+#ifndef CONSOLE_BAUD_RATE
+#define CONSOLE_BAUD_RATE 9600
+#define DEFAULT_CBAUD B9600
+#endif
+
+int mcfrs_console_inited = 0;
+int mcfrs_console_port = -1;
+int mcfrs_console_baud = CONSOLE_BAUD_RATE;
+int mcfrs_console_cbaud = DEFAULT_CBAUD;
+
+/*
+ * Driver data structures.
+ */
+static struct tty_driver *mcfrs_serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging...
+ */
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#if defined(CONFIG_M527x) || defined(CONFIG_M528x)
+#define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
+#else
+#define IRQBASE 73
+#endif
+
+/*
+ * Configuration table, UARTs to look for at startup.
+ */
+static struct mcf_serial mcfrs_table[] = {
+ { /* ttyS0 */
+ .magic = 0,
+ .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
+ .irq = IRQBASE,
+ .flags = ASYNC_BOOT_AUTOCONF,
+ },
+ { /* ttyS1 */
+ .magic = 0,
+ .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
+ .irq = IRQBASE+1,
+ .flags = ASYNC_BOOT_AUTOCONF,
+ },
+};
+
+
+#define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts.
+ */
+static int mcfrs_baud_table[] = {
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+ 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
+};
+#define MCFRS_BAUD_TABLE_SIZE \
+ (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
+
+
+#ifdef CONFIG_MAGIC_SYSRQ
+/*
+ * Magic system request keys. Used for debugging...
+ */
+extern int magic_sysrq_key(int ch);
+#endif
+
+
+/*
+ * Forware declarations...
+ */
+static void mcfrs_change_speed(struct mcf_serial *info);
+static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+
+static inline int serial_paranoia_check(struct mcf_serial *info,
+ char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char badmagic[] =
+ "MCFRS(warning): bad magic number for serial struct %s in %s\n";
+ static const char badinfo[] =
+ "MCFRS(warning): null mcf_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;
+}
+
+/*
+ * Sets or clears DTR and RTS on the requested line.
+ */
+static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+
+#if 0
+ printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
+ __FILE__, __LINE__, info, dtr, rts);
+#endif
+
+ local_irq_save(flags);
+ if (dtr >= 0) {
+#ifdef MCFPP_DTR0
+ if (info->line)
+ mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
+ else
+ mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
+#endif
+ }
+ if (rts >= 0) {
+ uartp = info->addr;
+ if (rts) {
+ info->sigs |= TIOCM_RTS;
+ uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
+ } else {
+ info->sigs &= ~TIOCM_RTS;
+ uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
+ }
+ }
+ local_irq_restore(flags);
+ return;
+}
+
+/*
+ * Gets values of serial signals.
+ */
+static int mcfrs_getsignals(struct mcf_serial *info)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+ int sigs;
+#if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
+ unsigned short ppdata;
+#endif
+
+#if 0
+ printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
+#endif
+
+ local_irq_save(flags);
+ uartp = info->addr;
+ sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
+ sigs |= (info->sigs & TIOCM_RTS);
+
+#ifdef MCFPP_DCD0
+{
+ unsigned int ppdata;
+ ppdata = mcf_getppdata();
+ if (info->line == 0) {
+ sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
+ sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
+ } else if (info->line == 1) {
+ sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
+ sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
+ }
+}
+#endif
+
+ local_irq_restore(flags);
+ return(sigs);
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_stop() and mcfrs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void mcfrs_stop(struct tty_struct *tty)
+{
+ volatile unsigned char *uartp;
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
+ return;
+
+ local_irq_save(flags);
+ uartp = info->addr;
+ info->imr &= ~MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ local_irq_restore(flags);
+}
+
+static void mcfrs_start(struct tty_struct *tty)
+{
+ volatile unsigned char *uartp;
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
+ return;
+
+ local_irq_save(flags);
+ if (info->xmit_cnt && info->xmit_buf) {
+ uartp = info->addr;
+ info->imr |= MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ }
+ local_irq_restore(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * mcfrs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * mcfrs_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_chars(struct mcf_serial *info)
+{
+ volatile unsigned char *uartp;
+ struct tty_struct *tty = info->tty;
+ unsigned char status, ch;
+
+ if (!tty)
+ return;
+
+ uartp = info->addr;
+
+ while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
+
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ break;
+
+ ch = uartp[MCFUART_URB];
+ info->stats.rx++;
+
+#ifdef CONFIG_MAGIC_SYSRQ
+ if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
+ if (magic_sysrq_key(ch))
+ continue;
+ }
+#endif
+
+ tty->flip.count++;
+ if (status & MCFUART_USR_RXERR) {
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
+ if (status & MCFUART_USR_RXBREAK) {
+ info->stats.rxbreak++;
+ *tty->flip.flag_buf_ptr++ = TTY_BREAK;
+ } else if (status & MCFUART_USR_RXPARITY) {
+ info->stats.rxparity++;
+ *tty->flip.flag_buf_ptr++ = TTY_PARITY;
+ } else if (status & MCFUART_USR_RXOVERRUN) {
+ info->stats.rxoverrun++;
+ *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+ } else if (status & MCFUART_USR_RXFRAMING) {
+ info->stats.rxframing++;
+ *tty->flip.flag_buf_ptr++ = TTY_FRAME;
+ } else {
+ /* This should never happen... */
+ *tty->flip.flag_buf_ptr++ = 0;
+ }
+ } else {
+ *tty->flip.flag_buf_ptr++ = 0;
+ }
+ *tty->flip.char_buf_ptr++ = ch;
+ }
+
+ schedule_work(&tty->flip.work);
+ return;
+}
+
+static inline void transmit_chars(struct mcf_serial *info)
+{
+ volatile unsigned char *uartp;
+
+ uartp = info->addr;
+
+ if (info->x_char) {
+ /* Send special char - probably flow control */
+ uartp[MCFUART_UTB] = info->x_char;
+ info->x_char = 0;
+ info->stats.tx++;
+ }
+
+ if ((info->xmit_cnt <= 0) || info->tty->stopped) {
+ info->imr &= ~MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ return;
+ }
+
+ while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
+ uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->stats.tx++;
+ if (--info->xmit_cnt <= 0)
+ break;
+ }
+
+ if (info->xmit_cnt < WAKEUP_CHARS)
+ schedule_work(&info->tqueue);
+ return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct mcf_serial *info;
+ unsigned char isr;
+
+ info = &mcfrs_table[(irq - IRQBASE)];
+ isr = info->addr[MCFUART_UISR] & info->imr;
+
+ if (isr & MCFUART_UIR_RXREADY)
+ receive_chars(info);
+ if (isr & MCFUART_UIR_TXREADY)
+ transmit_chars(info);
+ return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+static void mcfrs_offintr(void *private)
+{
+ struct mcf_serial *info = (struct mcf_serial *) private;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+ tty_wakeup(tty);
+}
+
+
+/*
+ * Change of state on a DCD line.
+ */
+void mcfrs_modem_change(struct mcf_serial *info, int dcd)
+{
+ if (info->count == 0)
+ return;
+
+ if (info->flags & ASYNC_CHECK_CD) {
+ if (dcd)
+ wake_up_interruptible(&info->open_wait);
+ else
+ schedule_work(&info->tqueue_hangup);
+ }
+}
+
+
+#ifdef MCFPP_DCD0
+
+unsigned short mcfrs_ppstatus;
+
+/*
+ * This subroutine is called when the RS_TIMER goes off. It is used
+ * to monitor the state of the DCD lines - since they have no edge
+ * sensors and interrupt generators.
+ */
+static void mcfrs_timer(void)
+{
+ unsigned int ppstatus, dcdval, i;
+
+ ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
+
+ if (ppstatus != mcfrs_ppstatus) {
+ for (i = 0; (i < 2); i++) {
+ dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
+ if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
+ mcfrs_modem_change(&mcfrs_table[i],
+ ((ppstatus & dcdval) ? 0 : 1));
+ }
+ }
+ }
+ mcfrs_ppstatus = ppstatus;
+
+ /* Re-arm timer */
+ mcfrs_timer_struct.expires = jiffies + HZ/25;
+ add_timer(&mcfrs_timer_struct);
+}
+
+#endif /* MCFPP_DCD0 */
+
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
+ *
+ */
+static void do_serial_hangup(void *private)
+{
+ struct mcf_serial *info = (struct mcf_serial *) private;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ tty_hangup(tty);
+}
+
+static int startup(struct mcf_serial * info)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+
+ if (info->flags & ASYNC_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);
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
+#endif
+
+ /*
+ * Reset UART, get it into known state...
+ */
+ uartp = info->addr;
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
+ mcfrs_setsignals(info, 1, 1);
+
+ 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
+ */
+ mcfrs_change_speed(info);
+
+ /*
+ * Lastly enable the UART transmitter and receiver, and
+ * interrupt enables.
+ */
+ info->imr = MCFUART_UIR_RXREADY;
+ uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
+ uartp[MCFUART_UIMR] = info->imr;
+
+ info->flags |= ASYNC_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 mcf_serial * info)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....\n", info->line,
+ info->irq);
+#endif
+
+ local_irq_save(flags);
+
+ uartp = info->addr;
+ uartp[MCFUART_UIMR] = 0; /* mask all interrupts */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
+
+ if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+ mcfrs_setsignals(info, 0, 0);
+
+ 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 &= ~ASYNC_INITIALIZED;
+ local_irq_restore(flags);
+}
+
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void mcfrs_change_speed(struct mcf_serial *info)
+{
+ volatile unsigned char *uartp;
+ unsigned int baudclk, cflag;
+ unsigned long flags;
+ unsigned char mr1, mr2;
+ int i;
+#ifdef CONFIG_M5272
+ unsigned int fraction;
+#endif
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ if (info->addr == 0)
+ return;
+
+#if 0
+ printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
+#endif
+
+ i = cflag & CBAUD;
+ if (i & CBAUDEX) {
+ i &= ~CBAUDEX;
+ if (i < 1 || i > 4)
+ info->tty->termios->c_cflag &= ~CBAUDEX;
+ else
+ i += 15;
+ }
+ if (i == 0) {
+ mcfrs_setsignals(info, 0, -1);
+ return;
+ }
+
+ /* compute the baudrate clock */
+#ifdef CONFIG_M5272
+ /*
+ * For the MCF5272, also compute the baudrate fraction.
+ */
+ baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
+ fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
+ fraction *= 16;
+ fraction /= (32 * mcfrs_baud_table[i]);
+#else
+ baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
+#endif
+
+ info->baud = mcfrs_baud_table[i];
+
+ mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
+ mr2 = 0;
+
+ switch (cflag & CSIZE) {
+ case CS5: mr1 |= MCFUART_MR1_CS5; break;
+ case CS6: mr1 |= MCFUART_MR1_CS6; break;
+ case CS7: mr1 |= MCFUART_MR1_CS7; break;
+ case CS8:
+ default: mr1 |= MCFUART_MR1_CS8; break;
+ }
+
+ if (cflag & PARENB) {
+ if (cflag & CMSPAR) {
+ if (cflag & PARODD)
+ mr1 |= MCFUART_MR1_PARITYMARK;
+ else
+ mr1 |= MCFUART_MR1_PARITYSPACE;
+ } else {
+ if (cflag & PARODD)
+ mr1 |= MCFUART_MR1_PARITYODD;
+ else
+ mr1 |= MCFUART_MR1_PARITYEVEN;
+ }
+ } else {
+ mr1 |= MCFUART_MR1_PARITYNONE;
+ }
+
+ if (cflag & CSTOPB)
+ mr2 |= MCFUART_MR2_STOP2;
+ else
+ mr2 |= MCFUART_MR2_STOP1;
+
+ if (cflag & CRTSCTS) {
+ mr1 |= MCFUART_MR1_RXRTS;
+ mr2 |= MCFUART_MR2_TXCTS;
+ }
+
+ if (cflag & CLOCAL)
+ info->flags &= ~ASYNC_CHECK_CD;
+ else
+ info->flags |= ASYNC_CHECK_CD;
+
+ uartp = info->addr;
+
+ local_irq_save(flags);
+#if 0
+ printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
+ mr1, mr2, baudclk);
+#endif
+ /*
+ Note: pg 12-16 of MCF5206e User's Manual states that a
+ software reset should be performed prior to changing
+ UMR1,2, UCSR, UACR, bit 7
+ */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
+ uartp[MCFUART_UMR] = mr1;
+ uartp[MCFUART_UMR] = mr2;
+ uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */
+ uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */
+#ifdef CONFIG_M5272
+ uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */
+#endif
+ uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
+ uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
+ mcfrs_setsignals(info, 1, -1);
+ local_irq_restore(flags);
+ return;
+}
+
+static void mcfrs_flush_chars(struct tty_struct *tty)
+{
+ volatile unsigned char *uartp;
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
+ return;
+
+ uartp = (volatile unsigned char *) info->addr;
+
+ /*
+ * re-enable receiver interrupt
+ */
+ local_irq_save(flags);
+ if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
+ (info->flags & ASYNC_INITIALIZED) ) {
+ info->imr |= MCFUART_UIR_RXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ }
+ local_irq_restore(flags);
+
+ if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+ !info->xmit_buf)
+ return;
+
+ /* Enable transmitter */
+ local_irq_save(flags);
+ info->imr |= MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ local_irq_restore(flags);
+}
+
+static int mcfrs_write(struct tty_struct * tty,
+ const unsigned char *buf, int count)
+{
+ volatile unsigned char *uartp;
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+ int c, total = 0;
+
+#if 0
+ printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
+ __FILE__, __LINE__, (int)tty, (int)buf, count);
+#endif
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
+ return 0;
+
+ if (!tty || !info->xmit_buf)
+ return 0;
+
+ local_save_flags(flags);
+ while (1) {
+ local_irq_disable();
+ c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
+ ((int)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;
+ }
+
+ local_irq_disable();
+ uartp = info->addr;
+ info->imr |= MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ local_irq_restore(flags);
+
+ return total;
+}
+
+static int mcfrs_write_room(struct tty_struct *tty)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ int ret;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
+ return 0;
+ ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+ if (ret < 0)
+ ret = 0;
+ return ret;
+}
+
+static int mcfrs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
+ return 0;
+ return info->xmit_cnt;
+}
+
+static void mcfrs_flush_buffer(struct tty_struct *tty)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
+ return;
+
+ local_irq_save(flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ local_irq_restore(flags);
+
+ tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void mcfrs_throttle(struct tty_struct * tty)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+
+ /* Turn off RTS line (do this atomic) */
+}
+
+static void mcfrs_unthrottle(struct tty_struct * tty)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_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) */
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct mcf_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 = (unsigned int) info->addr;
+ 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;
+ return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+static int set_serial_info(struct mcf_serial * info,
+ struct serial_struct * new_info)
+{
+ struct serial_struct new_serial;
+ struct mcf_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 & ~ASYNC_USR_MASK) !=
+ (info->flags & ~ASYNC_USR_MASK)))
+ return -EPERM;
+ info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+ (new_serial.flags & ASYNC_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 & ~ASYNC_FLAGS) |
+ (new_serial.flags & ASYNC_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 mcf_serial * info, unsigned int *value)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+ unsigned char status;
+
+ local_irq_save(flags);
+ uartp = info->addr;
+ status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
+ local_irq_restore(flags);
+
+ return put_user(status,value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break( struct mcf_serial * info, int duration)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+
+ if (!info->addr)
+ return;
+ set_current_state(TASK_INTERRUPTIBLE);
+ uartp = info->addr;
+
+ local_irq_save(flags);
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
+ schedule_timeout(duration);
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
+ local_irq_restore(flags);
+}
+
+static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
+{
+ struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ return mcfrs_getsignals(info);
+}
+
+static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+ int rts = -1, dtr = -1;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ if (set & TIOCM_RTS)
+ rts = 1;
+ if (set & TIOCM_DTR)
+ dtr = 1;
+ if (clear & TIOCM_RTS)
+ rts = 0;
+ if (clear & TIOCM_DTR)
+ dtr = 0;
+
+ mcfrs_setsignals(info, dtr, rts);
+
+ return 0;
+}
+
+static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+ int retval, error;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_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, 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 = put_user(C_CLOCAL(tty) ? 1 : 0,
+ (unsigned long *) arg);
+ if (error)
+ return error;
+ return 0;
+ case TIOCSSOFTCAR:
+ get_user(arg, (unsigned long *) arg);
+ tty->termios->c_cflag =
+ ((tty->termios->c_cflag & ~CLOCAL) |
+ (arg ? CLOCAL : 0));
+ return 0;
+ case TIOCGSERIAL:
+ if (access_ok(VERIFY_WRITE, (void *) arg,
+ sizeof(struct serial_struct)))
+ return get_serial_info(info,
+ (struct serial_struct *) arg);
+ return -EFAULT;
+ case TIOCSSERIAL:
+ return set_serial_info(info,
+ (struct serial_struct *) arg);
+ case TIOCSERGETLSR: /* Get line status register */
+ if (access_ok(VERIFY_WRITE, (void *) arg,
+ sizeof(unsigned int)))
+ return get_lsr_info(info, (unsigned int *) arg);
+ return -EFAULT;
+ case TIOCSERGSTRUCT:
+ error = copy_to_user((struct mcf_serial *) arg,
+ info, sizeof(struct mcf_serial));
+ if (error)
+ return -EFAULT;
+ return 0;
+
+#ifdef TIOCSET422
+ case TIOCSET422: {
+ unsigned int val;
+ get_user(val, (unsigned int *) arg);
+ mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
+ break;
+ }
+ case TIOCGET422: {
+ unsigned int val;
+ val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
+ put_user(val, (unsigned int *) arg);
+ break;
+ }
+#endif
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+
+ if (tty->termios->c_cflag == old_termios->c_cflag)
+ return;
+
+ mcfrs_change_speed(info);
+
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ mcfrs_setsignals(info, -1, 1);
+#if 0
+ mcfrs_start(tty);
+#endif
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_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 mcfrs_close(struct tty_struct *tty, struct file * filp)
+{
+ volatile unsigned char *uartp;
+ struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
+ return;
+
+ local_irq_save(flags);
+
+ if (tty_hung_up_p(filp)) {
+ local_irq_restore(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count);
+#endif
+ 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("MCFRS: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+ if (--info->count < 0) {
+ printk("MCFRS: 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 |= ASYNC_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 != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, info->closing_wait);
+
+ /*
+ * At this point we stop accepting input. To do this, we
+ * disable the receive line status interrupts, and tell the
+ * interrupt driver to stop checking the data ready bit in the
+ * line status register.
+ */
+ info->imr &= ~MCFUART_UIR_RXREADY;
+ uartp = info->addr;
+ uartp[MCFUART_UIMR] = info->imr;
+
+#if 0
+ /* FIXME: do we need to keep this enabled for console?? */
+ if (mcfrs_console_inited && (mcfrs_console_port == info->line)) {
+ /* Do not disable the UART */ ;
+ } else
+#endif
+ shutdown(info);
+ if (tty->driver->flush_buffer)
+ tty->driver->flush_buffer(tty);
+ tty_ldisc_flush(tty);
+
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+#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 &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ local_irq_restore(flags);
+}
+
+/*
+ * mcfrs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void
+mcfrs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+#ifdef CONFIG_M5272
+#define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */
+
+ struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+ volatile unsigned char *uartp;
+ unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent"))
+ return;
+
+ orig_jiffies = jiffies;
+
+ /*
+ * Set the check interval to be 1/5 of the approximate time
+ * to send the entire fifo, and make it at least 1. The check
+ * interval should also be less than the timeout.
+ *
+ * Note: we have to use pretty tight timings here to satisfy
+ * the NIST-PCTS.
+ */
+ fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
+ char_time = fifo_time / 5;
+ if (char_time == 0)
+ char_time = 1;
+ if (timeout && timeout < char_time)
+ char_time = timeout;
+
+ /*
+ * Clamp the timeout period at 2 * the time to empty the
+ * fifo. Just to be safe, set the minimum at .5 seconds.
+ */
+ fifo_time *= 2;
+ if (fifo_time < (HZ/2))
+ fifo_time = HZ/2;
+ if (!timeout || timeout > fifo_time)
+ timeout = fifo_time;
+
+ /*
+ * Account for the number of bytes in the UART
+ * transmitter FIFO plus any byte being shifted out.
+ */
+ uartp = (volatile unsigned char *) info->addr;
+ for (;;) {
+ fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB);
+ if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY|
+ MCFUART_USR_TXEMPTY)) ==
+ MCFUART_USR_TXREADY)
+ fifo_cnt++;
+ if (fifo_cnt == 0)
+ break;
+ msleep_interruptible(jiffies_to_msecs(char_time));
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+#else
+ /*
+ * For the other coldfire models, assume all data has been sent
+ */
+#endif
+}
+
+/*
+ * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void mcfrs_hangup(struct tty_struct *tty)
+{
+ struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "mcfrs_hangup"))
+ return;
+
+ mcfrs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~ASYNC_NORMAL_ACTIVE;
+ info->tty = 0;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct mcf_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 & ASYNC_CLOSING) {
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If 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 |= ASYNC_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
+ * mcfrs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ info->count--;
+ info->blocked_open++;
+ while (1) {
+ local_irq_disable();
+ mcfrs_setsignals(info, 1, 1);
+ local_irq_enable();
+ current->state = TASK_INTERRUPTIBLE;
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ASYNC_CLOSING) &&
+ (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD)))
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ info->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int mcfrs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct mcf_serial *info;
+ int retval, line;
+
+ line = tty->index;
+ if ((line < 0) || (line >= NR_PORTS))
+ return -ENODEV;
+ info = mcfrs_table + line;
+ if (serial_paranoia_check(info, tty->name, "mcfrs_open"))
+ return -ENODEV;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("mcfrs_open %s, count = %d\n", tty->name, info->count);
+#endif
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("mcfrs_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("mcfrs_open %s successful...\n", tty->name);
+#endif
+ return 0;
+}
+
+/*
+ * Based on the line number set up the internal interrupt stuff.
+ */
+static void mcfrs_irqinit(struct mcf_serial *info)
+{
+#if defined(CONFIG_M5272)
+ volatile unsigned long *icrp;
+ volatile unsigned long *portp;
+ volatile unsigned char *uartp;
+
+ uartp = info->addr;
+ icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2);
+
+ switch (info->line) {
+ case 0:
+ *icrp = 0xe0000000;
+ break;
+ case 1:
+ *icrp = 0x0e000000;
+ break;
+ default:
+ printk("MCFRS: don't know how to handle UART %d interrupt?\n",
+ info->line);
+ return;
+ }
+
+ /* Enable the output lines for the serial ports */
+ portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT);
+ *portp = (*portp & ~0x000000ff) | 0x00000055;
+ portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT);
+ *portp = (*portp & ~0x000003fc) | 0x000002a8;
+#elif defined(CONFIG_M527x) || defined(CONFIG_M528x)
+ volatile unsigned char *icrp, *uartp;
+ volatile unsigned long *imrp;
+
+ uartp = info->addr;
+
+ icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
+ MCFINTC_ICR0 + MCFINT_UART0 + info->line);
+ *icrp = 0x33; /* UART0 with level 6, priority 3 */
+
+ imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
+ MCFINTC_IMRL);
+ *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
+#else
+ volatile unsigned char *icrp, *uartp;
+
+ switch (info->line) {
+ case 0:
+ icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
+ *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
+ MCFSIM_ICR_PRI1;
+ mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
+ break;
+ case 1:
+ icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
+ *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
+ MCFSIM_ICR_PRI2;
+ mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
+ break;
+ default:
+ printk("MCFRS: don't know how to handle UART %d interrupt?\n",
+ info->line);
+ return;
+ }
+
+ uartp = info->addr;
+ uartp[MCFUART_UIVR] = info->irq;
+#endif
+
+ /* Clear mask, so no surprise interrupts. */
+ uartp[MCFUART_UIMR] = 0;
+
+ if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT,
+ "ColdFire UART", NULL)) {
+ printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
+ "vector=%d\n", info->line, info->irq);
+ }
+
+ return;
+}
+
+
+char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";
+
+
+/*
+ * Serial stats reporting...
+ */
+int mcfrs_readproc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ struct mcf_serial *info;
+ char str[20];
+ int len, sigs, i;
+
+ len = sprintf(page, mcfrs_drivername);
+ for (i = 0; (i < NR_PORTS); i++) {
+ info = &mcfrs_table[i];
+ len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
+ i, (unsigned int) info->addr, info->irq, info->baud);
+ if (info->stats.rx || info->stats.tx)
+ len += sprintf((page + len), "tx:%d rx:%d ",
+ info->stats.tx, info->stats.rx);
+ if (info->stats.rxframing)
+ len += sprintf((page + len), "fe:%d ",
+ info->stats.rxframing);
+ if (info->stats.rxparity)
+ len += sprintf((page + len), "pe:%d ",
+ info->stats.rxparity);
+ if (info->stats.rxbreak)
+ len += sprintf((page + len), "brk:%d ",
+ info->stats.rxbreak);
+ if (info->stats.rxoverrun)
+ len += sprintf((page + len), "oe:%d ",
+ info->stats.rxoverrun);
+
+ str[0] = str[1] = 0;
+ if ((sigs = mcfrs_getsignals(info))) {
+ if (sigs & TIOCM_RTS)
+ strcat(str, "|RTS");
+ if (sigs & TIOCM_CTS)
+ strcat(str, "|CTS");
+ if (sigs & TIOCM_DTR)
+ strcat(str, "|DTR");
+ if (sigs & TIOCM_CD)
+ strcat(str, "|CD");
+ }
+
+ len += sprintf((page + len), "%s\n", &str[1]);
+ }
+
+ return(len);
+}
+
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+ printk(mcfrs_drivername);
+}
+
+static struct tty_operations mcfrs_ops = {
+ .open = mcfrs_open,
+ .close = mcfrs_close,
+ .write = mcfrs_write,
+ .flush_chars = mcfrs_flush_chars,
+ .write_room = mcfrs_write_room,
+ .chars_in_buffer = mcfrs_chars_in_buffer,
+ .flush_buffer = mcfrs_flush_buffer,
+ .ioctl = mcfrs_ioctl,
+ .throttle = mcfrs_throttle,
+ .unthrottle = mcfrs_unthrottle,
+ .set_termios = mcfrs_set_termios,
+ .stop = mcfrs_stop,
+ .start = mcfrs_start,
+ .hangup = mcfrs_hangup,
+ .read_proc = mcfrs_readproc,
+ .wait_until_sent = mcfrs_wait_until_sent,
+ .tiocmget = mcfrs_tiocmget,
+ .tiocmset = mcfrs_tiocmset,
+};
+
+/* mcfrs_init inits the driver */
+static int __init
+mcfrs_init(void)
+{
+ struct mcf_serial *info;
+ unsigned long flags;
+ int i;
+
+ /* Setup base handler, and timer table. */
+#ifdef MCFPP_DCD0
+ init_timer(&mcfrs_timer_struct);
+ mcfrs_timer_struct.function = mcfrs_timer;
+ mcfrs_timer_struct.data = 0;
+ mcfrs_timer_struct.expires = jiffies + HZ/25;
+ add_timer(&mcfrs_timer_struct);
+ mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
+#endif
+ mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
+ if (!mcfrs_serial_driver)
+ return -ENOMEM;
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+ mcfrs_serial_driver->owner = THIS_MODULE;
+ mcfrs_serial_driver->name = "ttyS";
+ mcfrs_serial_driver->devfs_name = "ttys/";
+ mcfrs_serial_driver->driver_name = "serial";
+ mcfrs_serial_driver->major = TTY_MAJOR;
+ mcfrs_serial_driver->minor_start = 64;
+ mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
+ mcfrs_serial_driver->init_termios = tty_std_termios;
+
+ mcfrs_serial_driver->init_termios.c_cflag =
+ mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
+ mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;
+
+ tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);
+
+ if (tty_register_driver(mcfrs_serial_driver)) {
+ printk("MCFRS: Couldn't register serial driver\n");
+ put_tty_driver(mcfrs_serial_driver);
+ return(-EBUSY);
+ }
+
+ local_irq_save(flags);
+
+ /*
+ * Configure all the attached serial ports.
+ */
+ for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
+ info->magic = SERIAL_MAGIC;
+ info->line = i;
+ info->tty = 0;
+ 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_WORK(&info->tqueue, mcfrs_offintr, info);
+ INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+
+ info->imr = 0;
+ mcfrs_setsignals(info, 0, 0);
+ mcfrs_irqinit(info);
+
+ printk("ttyS%d at 0x%04x (irq = %d)", info->line,
+ (unsigned int) info->addr, info->irq);
+ printk(" is a builtin ColdFire UART\n");
+ }
+
+ local_irq_restore(flags);
+ return 0;
+}
+
+module_init(mcfrs_init);
+
+/****************************************************************************/
+/* Serial Console */
+/****************************************************************************/
+
+/*
+ * Quick and dirty UART initialization, for console output.
+ */
+
+void mcfrs_init_console(void)
+{
+ volatile unsigned char *uartp;
+ unsigned int clk;
+
+ /*
+ * Reset UART, get it into known state...
+ */
+ uartp = (volatile unsigned char *) (MCF_MBAR +
+ (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
+
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
+
+ /*
+ * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
+ */
+ uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
+ uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
+
+ clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
+ uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */
+ uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */
+
+ uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
+ uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
+
+ mcfrs_console_inited++;
+ return;
+}
+
+
+/*
+ * Setup for console. Argument comes from the boot command line.
+ */
+
+int mcfrs_console_setup(struct console *cp, char *arg)
+{
+ int i, n = CONSOLE_BAUD_RATE;
+
+ if (!cp)
+ return(-1);
+
+ if (!strncmp(cp->name, "ttyS", 4))
+ mcfrs_console_port = cp->index;
+ else if (!strncmp(cp->name, "cua", 3))
+ mcfrs_console_port = cp->index;
+ else
+ return(-1);
+
+ if (arg)
+ n = simple_strtoul(arg,NULL,0);
+ for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
+ if (mcfrs_baud_table[i] == n)
+ break;
+ if (i < MCFRS_BAUD_TABLE_SIZE) {
+ mcfrs_console_baud = n;
+ mcfrs_console_cbaud = 0;
+ if (i > 15) {
+ mcfrs_console_cbaud |= CBAUDEX;
+ i -= 15;
+ }
+ mcfrs_console_cbaud |= i;
+ }
+ mcfrs_init_console(); /* make sure baud rate changes */
+ return(0);
+}
+
+
+static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return mcfrs_serial_driver;
+}
+
+
+/*
+ * Output a single character, using UART polled mode.
+ * This is used for console output.
+ */
+
+void mcfrs_put_char(char ch)
+{
+ volatile unsigned char *uartp;
+ unsigned long flags;
+ int i;
+
+ uartp = (volatile unsigned char *) (MCF_MBAR +
+ (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
+
+ local_irq_save(flags);
+ for (i = 0; (i < 0x10000); i++) {
+ if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
+ break;
+ }
+ if (i < 0x10000) {
+ uartp[MCFUART_UTB] = ch;
+ for (i = 0; (i < 0x10000); i++)
+ if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
+ break;
+ }
+ if (i >= 0x10000)
+ mcfrs_init_console(); /* try and get it back */
+ local_irq_restore(flags);
+
+ return;
+}
+
+
+/*
+ * rs_console_write is registered for printk output.
+ */
+
+void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
+{
+ if (!mcfrs_console_inited)
+ mcfrs_init_console();
+ while (len-- > 0) {
+ if (*p == '\n')
+ mcfrs_put_char('\r');
+ mcfrs_put_char(*p++);
+ }
+}
+
+/*
+ * declare our consoles
+ */
+
+struct console mcfrs_console = {
+ .name = "ttyS",
+ .write = mcfrs_console_write,
+ .device = mcfrs_console_device,
+ .setup = mcfrs_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+static int __init mcfrs_console_init(void)
+{
+ register_console(&mcfrs_console);
+ return 0;
+}
+
+console_initcall(mcfrs_console_init);
+
+/****************************************************************************/