--- /dev/null
+/*
+ * Serial driver for the amiga builtin port.
+ *
+ * This code was created by taking serial.c version 4.30 from kernel
+ * release 2.3.22, replacing all hardware related stuff with the
+ * corresponding amiga hardware actions, and removing all irrelevant
+ * code. As a consequence, it uses many of the constants and names
+ * associated with the registers and bits of 16550 compatible UARTS -
+ * but only to keep track of status, etc in the state variables. It
+ * was done this was to make it easier to keep the code in line with
+ * (non hardware specific) changes to serial.c.
+ *
+ * The port is registered with the tty driver as minor device 64, and
+ * therefore other ports should should only use 65 upwards.
+ *
+ * Richard Lucock 28/12/99
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
+ * 1998, 1999 Theodore Ts'o
+ *
+ */
+
+/*
+ * Serial driver configuration section. Here are the various options:
+ *
+ * SERIAL_PARANOIA_CHECK
+ * Check the magic number for the async_structure where
+ * ever possible.
+ */
+
+#include <linux/delay.h>
+
+#undef SERIAL_PARANOIA_CHECK
+#define SERIAL_DO_RESTART
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+/* Sanity checks */
+
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
+ tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+/*
+ * End of serial driver configuration section.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+static char *serial_version = "4.30";
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/circ_buf.h>
+#include <linux/console.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+
+#include <asm/setup.h>
+
+
+#include <asm/irq.h>
+
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+struct serial_state {
+ struct tty_port tport;
+ struct circ_buf xmit;
+ struct async_icount icount;
+
+ unsigned long port;
+ int baud_base;
+ int xmit_fifo_size;
+ int custom_divisor;
+ int read_status_mask;
+ int ignore_status_mask;
+ int timeout;
+ int quot;
+ int IER; /* Interrupt Enable Register */
+ int MCR; /* Modem control register */
+ int x_char; /* xon/xoff character */
+};
+
+#define custom amiga_custom
+static char *serial_name = "Amiga-builtin serial driver";
+
+static struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+static unsigned char current_ctl_bits;
+
+static void change_speed(struct tty_struct *tty, struct serial_state *info,
+ struct ktermios *old);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+
+static struct serial_state rs_table[1];
+
+#define NR_PORTS ARRAY_SIZE(rs_table)
+
+#include <asm/uaccess.h>
+
+#define serial_isroot() (capable(CAP_SYS_ADMIN))
+
+
+static inline int serial_paranoia_check(struct serial_state *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 async_struct 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;
+}
+
+/* some serial hardware definitions */
+#define SDR_OVRUN (1<<15)
+#define SDR_RBF (1<<14)
+#define SDR_TBE (1<<13)
+#define SDR_TSRE (1<<12)
+
+#define SERPER_PARENB (1<<15)
+
+#define AC_SETCLR (1<<15)
+#define AC_UARTBRK (1<<11)
+
+#define SER_DTR (1<<7)
+#define SER_RTS (1<<6)
+#define SER_DCD (1<<5)
+#define SER_CTS (1<<4)
+#define SER_DSR (1<<3)
+
+static __inline__ void rtsdtr_ctrl(int bits)
+{
+ ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_stop"))
+ return;
+
+ local_irq_save(flags);
+ if (info->IER & UART_IER_THRI) {
+ info->IER &= ~UART_IER_THRI;
+ /* disable Tx interrupt and remove any pending interrupts */
+ custom.intena = IF_TBE;
+ mb();
+ custom.intreq = IF_TBE;
+ mb();
+ }
+ local_irq_restore(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_start"))
+ return;
+
+ local_irq_save(flags);
+ if (info->xmit.head != info->xmit.tail
+ && info->xmit.buf
+ && !(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ custom.intena = IF_SETCLR | IF_TBE;
+ mb();
+ /* set a pending Tx Interrupt, transmitter should restart now */
+ custom.intreq = IF_SETCLR | IF_TBE;
+ mb();
+ }
+ local_irq_restore(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+static void receive_chars(struct serial_state *info)
+{
+ int status;
+ int serdatr;
+ unsigned char ch, flag;
+ struct async_icount *icount;
+ int oe = 0;
+
+ icount = &info->icount;
+
+ status = UART_LSR_DR; /* We obviously have a character! */
+ serdatr = custom.serdatr;
+ mb();
+ custom.intreq = IF_RBF;
+ mb();
+
+ if((serdatr & 0x1ff) == 0)
+ status |= UART_LSR_BI;
+ if(serdatr & SDR_OVRUN)
+ status |= UART_LSR_OE;
+
+ ch = serdatr & 0xff;
+ icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("DR%02x:%02x...", ch, status);
+#endif
+ flag = TTY_NORMAL;
+
+ /*
+ * We don't handle parity or frame errors - but I have left
+ * the code in, since I'm not sure that the errors can't be
+ * detected.
+ */
+
+ if (status & (UART_LSR_BI | UART_LSR_PE |
+ UART_LSR_FE | UART_LSR_OE)) {
+ /*
+ * For statistics only
+ */
+ if (status & UART_LSR_BI) {
+ status &= ~(UART_LSR_FE | UART_LSR_PE);
+ icount->brk++;
+ } else if (status & UART_LSR_PE)
+ icount->parity++;
+ else if (status & UART_LSR_FE)
+ icount->frame++;
+ if (status & UART_LSR_OE)
+ icount->overrun++;
+
+ /*
+ * Now check to see if character should be
+ * ignored, and mask off conditions which
+ * should be ignored.
+ */
+ if (status & info->ignore_status_mask)
+ goto out;
+
+ status &= info->read_status_mask;
+
+ if (status & (UART_LSR_BI)) {
+#ifdef SERIAL_DEBUG_INTR
+ printk("handling break....");
+#endif
+ flag = TTY_BREAK;
+ if (info->tport.flags & ASYNC_SAK)
+ do_SAK(info->tport.tty);
+ } else if (status & UART_LSR_PE)
+ flag = TTY_PARITY;
+ else if (status & UART_LSR_FE)
+ flag = TTY_FRAME;
+ if (status & UART_LSR_OE) {
+ /*
+ * Overrun is special, since it's
+ * reported immediately, and doesn't
+ * affect the current character
+ */
+ oe = 1;
+ }
+ }
+ tty_insert_flip_char(&info->tport, ch, flag);
+ if (oe == 1)
+ tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
+ tty_flip_buffer_push(&info->tport);
+out:
+ return;
+}
+
+static void transmit_chars(struct serial_state *info)
+{
+ custom.intreq = IF_TBE;
+ mb();
+ if (info->x_char) {
+ custom.serdat = info->x_char | 0x100;
+ mb();
+ info->icount.tx++;
+ info->x_char = 0;
+ return;
+ }
+ if (info->xmit.head == info->xmit.tail
+ || info->tport.tty->stopped
+ || info->tport.tty->hw_stopped) {
+ info->IER &= ~UART_IER_THRI;
+ custom.intena = IF_TBE;
+ mb();
+ return;
+ }
+
+ custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
+ mb();
+ info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
+ info->icount.tx++;
+
+ if (CIRC_CNT(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+ tty_wakeup(info->tport.tty);
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("THRE...");
+#endif
+ if (info->xmit.head == info->xmit.tail) {
+ custom.intena = IF_TBE;
+ mb();
+ info->IER &= ~UART_IER_THRI;
+ }
+}
+
+static void check_modem_status(struct serial_state *info)
+{
+ struct tty_port *port = &info->tport;
+ unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
+ unsigned char dstatus;
+ struct async_icount *icount;
+
+ /* Determine bits that have changed */
+ dstatus = status ^ current_ctl_bits;
+ current_ctl_bits = status;
+
+ if (dstatus) {
+ icount = &info->icount;
+ /* update input line counters */
+ if (dstatus & SER_DSR)
+ icount->dsr++;
+ if (dstatus & SER_DCD) {
+ icount->dcd++;
+ }
+ if (dstatus & SER_CTS)
+ icount->cts++;
+ wake_up_interruptible(&port->delta_msr_wait);
+ }
+
+ if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
+#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
+ printk("ttyS%d CD now %s...", info->line,
+ (!(status & SER_DCD)) ? "on" : "off");
+#endif
+ if (!(status & SER_DCD))
+ wake_up_interruptible(&port->open_wait);
+ else {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("doing serial hangup...");
+#endif
+ if (port->tty)
+ tty_hangup(port->tty);
+ }
+ }
+ if (tty_port_cts_enabled(port)) {
+ if (port->tty->hw_stopped) {
+ if (!(status & SER_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+ printk("CTS tx start...");
+#endif
+ port->tty->hw_stopped = 0;
+ info->IER |= UART_IER_THRI;
+ custom.intena = IF_SETCLR | IF_TBE;
+ mb();
+ /* set a pending Tx Interrupt, transmitter should restart now */
+ custom.intreq = IF_SETCLR | IF_TBE;
+ mb();
+ tty_wakeup(port->tty);
+ return;
+ }
+ } else {
+ if ((status & SER_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+ printk("CTS tx stop...");
+#endif
+ port->tty->hw_stopped = 1;
+ info->IER &= ~UART_IER_THRI;
+ /* disable Tx interrupt and remove any pending interrupts */
+ custom.intena = IF_TBE;
+ mb();
+ custom.intreq = IF_TBE;
+ mb();
+ }
+ }
+ }
+}
+
+static irqreturn_t ser_vbl_int( int irq, void *data)
+{
+ /* vbl is just a periodic interrupt we tie into to update modem status */
+ struct serial_state *info = data;
+ /*
+ * TBD - is it better to unregister from this interrupt or to
+ * ignore it if MSI is clear ?
+ */
+ if(info->IER & UART_IER_MSI)
+ check_modem_status(info);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ser_rx_int(int irq, void *dev_id)
+{
+ struct serial_state *info = dev_id;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("ser_rx_int...");
+#endif
+
+ if (!info->tport.tty)
+ return IRQ_NONE;
+
+ receive_chars(info);
+#ifdef SERIAL_DEBUG_INTR
+ printk("end.\n");
+#endif
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ser_tx_int(int irq, void *dev_id)
+{
+ struct serial_state *info = dev_id;
+
+ if (custom.serdatr & SDR_TBE) {
+#ifdef SERIAL_DEBUG_INTR
+ printk("ser_tx_int...");
+#endif
+
+ if (!info->tport.tty)
+ return IRQ_NONE;
+
+ transmit_chars(info);
+#ifdef SERIAL_DEBUG_INTR
+ printk("end.\n");
+#endif
+ }
+ return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * ---------------------------------------------------------------
+ * Low level utility subroutines for the serial driver: routines to
+ * figure out the appropriate timeout for an interrupt chain, routines
+ * to initialize and startup a serial port, and routines to shutdown a
+ * serial port. Useful stuff like that.
+ * ---------------------------------------------------------------
+ */
+
+static int startup(struct tty_struct *tty, struct serial_state *info)
+{
+ struct tty_port *port = &info->tport;
+ unsigned long flags;
+ int retval=0;
+ unsigned long page;
+
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ local_irq_save(flags);
+
+ if (port->flags & ASYNC_INITIALIZED) {
+ free_page(page);
+ goto errout;
+ }
+
+ if (info->xmit.buf)
+ free_page(page);
+ else
+ info->xmit.buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttys%d ...", info->line);
+#endif
+
+ /* Clear anything in the input buffer */
+
+ custom.intreq = IF_RBF;
+ mb();
+
+ retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
+ if (retval) {
+ if (serial_isroot()) {
+ set_bit(TTY_IO_ERROR, &tty->flags);
+ retval = 0;
+ }
+ goto errout;
+ }
+
+ /* enable both Rx and Tx interrupts */
+ custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
+ mb();
+ info->IER = UART_IER_MSI;
+
+ /* remember current state of the DCD and CTS bits */
+ current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
+
+ info->MCR = 0;
+ if (C_BAUD(tty))
+ info->MCR = SER_DTR | SER_RTS;
+ rtsdtr_ctrl(info->MCR);
+
+ clear_bit(TTY_IO_ERROR, &tty->flags);
+ info->xmit.head = info->xmit.tail = 0;
+
+ /*
+ * Set up the tty->alt_speed kludge
+ */
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ tty->alt_speed = 57600;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ tty->alt_speed = 115200;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ tty->alt_speed = 230400;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ tty->alt_speed = 460800;
+
+ /*
+ * and set the speed of the serial port
+ */
+ change_speed(tty, info, NULL);
+
+ port->flags |= ASYNC_INITIALIZED;
+ local_irq_restore(flags);
+ return 0;
+
+errout:
+ local_irq_restore(flags);
+ return retval;
+}
+
+/*
+ * 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 tty_struct *tty, struct serial_state *info)
+{
+ unsigned long flags;
+ struct serial_state *state;
+
+ if (!(info->tport.flags & ASYNC_INITIALIZED))
+ return;
+
+ state = info;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d ....\n", info->line);
+#endif
+
+ local_irq_save(flags); /* Disable interrupts */
+
+ /*
+ * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+ * here so the queue might never be waken up
+ */
+ wake_up_interruptible(&info->tport.delta_msr_wait);
+
+ /*
+ * Free the IRQ, if necessary
+ */
+ free_irq(IRQ_AMIGA_VERTB, info);
+
+ if (info->xmit.buf) {
+ free_page((unsigned long) info->xmit.buf);
+ info->xmit.buf = NULL;
+ }
+
+ info->IER = 0;
+ custom.intena = IF_RBF | IF_TBE;
+ mb();
+
+ /* disable break condition */
+ custom.adkcon = AC_UARTBRK;
+ mb();
+
+ if (tty->termios.c_cflag & HUPCL)
+ info->MCR &= ~(SER_DTR|SER_RTS);
+ rtsdtr_ctrl(info->MCR);
+
+ set_bit(TTY_IO_ERROR, &tty->flags);
+
+ info->tport.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 change_speed(struct tty_struct *tty, struct serial_state *info,
+ struct ktermios *old_termios)
+{
+ struct tty_port *port = &info->tport;
+ int quot = 0, baud_base, baud;
+ unsigned cflag, cval = 0;
+ int bits;
+ unsigned long flags;
+
+ cflag = tty->termios.c_cflag;
+
+ /* Byte size is always 8 bits plus parity bit if requested */
+
+ cval = 3; bits = 10;
+ if (cflag & CSTOPB) {
+ cval |= 0x04;
+ bits++;
+ }
+ if (cflag & PARENB) {
+ cval |= UART_LCR_PARITY;
+ bits++;
+ }
+ if (!(cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+ if (cflag & CMSPAR)
+ cval |= UART_LCR_SPAR;
+#endif
+
+ /* Determine divisor based on baud rate */
+ baud = tty_get_baud_rate(tty);
+ if (!baud)
+ baud = 9600; /* B0 transition handled in rs_set_termios */
+ baud_base = info->baud_base;
+ if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
+ quot = info->custom_divisor;
+ else {
+ if (baud == 134)
+ /* Special case since 134 is really 134.5 */
+ quot = (2*baud_base / 269);
+ else if (baud)
+ quot = baud_base / baud;
+ }
+ /* If the quotient is zero refuse the change */
+ if (!quot && old_termios) {
+ /* FIXME: Will need updating for new tty in the end */
+ tty->termios.c_cflag &= ~CBAUD;
+ tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
+ baud = tty_get_baud_rate(tty);
+ if (!baud)
+ baud = 9600;
+ if (baud == 38400 &&
+ (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
+ quot = info->custom_divisor;
+ else {
+ if (baud == 134)
+ /* Special case since 134 is really 134.5 */
+ quot = (2*baud_base / 269);
+ else if (baud)
+ quot = baud_base / baud;
+ }
+ }
+ /* As a last resort, if the quotient is zero, default to 9600 bps */
+ if (!quot)
+ quot = baud_base / 9600;
+ info->quot = quot;
+ info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
+ info->timeout += HZ/50; /* Add .02 seconds of slop */
+
+ /* CTS flow control flag and modem status interrupts */
+ info->IER &= ~UART_IER_MSI;
+ if (port->flags & ASYNC_HARDPPS_CD)
+ info->IER |= UART_IER_MSI;
+ if (cflag & CRTSCTS) {
+ port->flags |= ASYNC_CTS_FLOW;
+ info->IER |= UART_IER_MSI;
+ } else
+ port->flags &= ~ASYNC_CTS_FLOW;
+ if (cflag & CLOCAL)
+ port->flags &= ~ASYNC_CHECK_CD;
+ else {
+ port->flags |= ASYNC_CHECK_CD;
+ info->IER |= UART_IER_MSI;
+ }
+ /* TBD:
+ * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
+ */
+
+ /*
+ * Set up parity check flag
+ */
+
+ info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
+ if (I_INPCK(tty))
+ info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+ if (I_BRKINT(tty) || I_PARMRK(tty))
+ info->read_status_mask |= UART_LSR_BI;
+
+ /*
+ * Characters to ignore
+ */
+ info->ignore_status_mask = 0;
+ if (I_IGNPAR(tty))
+ info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ if (I_IGNBRK(tty)) {
+ info->ignore_status_mask |= UART_LSR_BI;
+ /*
+ * If we're ignore parity and break indicators, ignore
+ * overruns too. (For real raw support).
+ */
+ if (I_IGNPAR(tty))
+ info->ignore_status_mask |= UART_LSR_OE;
+ }
+ /*
+ * !!! ignore all characters if CREAD is not set
+ */
+ if ((cflag & CREAD) == 0)
+ info->ignore_status_mask |= UART_LSR_DR;
+ local_irq_save(flags);
+
+ {
+ short serper;
+
+ /* Set up the baud rate */
+ serper = quot - 1;
+
+ /* Enable or disable parity bit */
+
+ if(cval & UART_LCR_PARITY)
+ serper |= (SERPER_PARENB);
+
+ custom.serper = serper;
+ mb();
+ }
+
+ local_irq_restore(flags);
+}
+
+static int rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ struct serial_state *info;
+ unsigned long flags;
+
+ info = tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_put_char"))
+ return 0;
+
+ if (!info->xmit.buf)
+ return 0;
+
+ local_irq_save(flags);
+ if (CIRC_SPACE(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE) == 0) {
+ local_irq_restore(flags);
+ return 0;
+ }
+
+ info->xmit.buf[info->xmit.head++] = ch;
+ info->xmit.head &= SERIAL_XMIT_SIZE-1;
+ local_irq_restore(flags);
+ return 1;
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+ return;
+
+ if (info->xmit.head == info->xmit.tail
+ || tty->stopped
+ || tty->hw_stopped
+ || !info->xmit.buf)
+ return;
+
+ local_irq_save(flags);
+ info->IER |= UART_IER_THRI;
+ custom.intena = IF_SETCLR | IF_TBE;
+ mb();
+ /* set a pending Tx Interrupt, transmitter should restart now */
+ custom.intreq = IF_SETCLR | IF_TBE;
+ mb();
+ local_irq_restore(flags);
+}
+
+static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
+{
+ int c, ret = 0;
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write"))
+ return 0;
+
+ if (!info->xmit.buf)
+ return 0;
+
+ local_irq_save(flags);
+ while (1) {
+ c = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+ if (count < c)
+ c = count;
+ if (c <= 0) {
+ break;
+ }
+ memcpy(info->xmit.buf + info->xmit.head, buf, c);
+ info->xmit.head = ((info->xmit.head + c) &
+ (SERIAL_XMIT_SIZE-1));
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ local_irq_restore(flags);
+
+ if (info->xmit.head != info->xmit.tail
+ && !tty->stopped
+ && !tty->hw_stopped
+ && !(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ local_irq_disable();
+ custom.intena = IF_SETCLR | IF_TBE;
+ mb();
+ /* set a pending Tx Interrupt, transmitter should restart now */
+ custom.intreq = IF_SETCLR | IF_TBE;
+ mb();
+ local_irq_restore(flags);
+ }
+ return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+ return 0;
+ return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+ return 0;
+ return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+ return;
+ local_irq_save(flags);
+ info->xmit.head = info->xmit.tail = 0;
+ local_irq_restore(flags);
+ tty_wakeup(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
+ return;
+
+ info->x_char = ch;
+ if (ch) {
+ /* Make sure transmit interrupts are on */
+
+ /* Check this ! */
+ local_irq_save(flags);
+ if(!(custom.intenar & IF_TBE)) {
+ custom.intena = IF_SETCLR | IF_TBE;
+ mb();
+ /* set a pending Tx Interrupt, transmitter should restart now */
+ custom.intreq = IF_SETCLR | IF_TBE;
+ mb();
+ }
+ local_irq_restore(flags);
+
+ info->IER |= UART_IER_THRI;
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 serial_state *info = tty->driver_data;
+ unsigned long flags;
+#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, "rs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ rs_send_xchar(tty, STOP_CHAR(tty));
+
+ if (tty->termios.c_cflag & CRTSCTS)
+ info->MCR &= ~SER_RTS;
+
+ local_irq_save(flags);
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+#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, "rs_unthrottle"))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ rs_send_xchar(tty, START_CHAR(tty));
+ }
+ if (tty->termios.c_cflag & CRTSCTS)
+ info->MCR |= SER_RTS;
+ local_irq_save(flags);
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
+ struct serial_struct __user * retinfo)
+{
+ struct serial_struct tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+ memset(&tmp, 0, sizeof(tmp));
+ tty_lock(tty);
+ tmp.line = tty->index;
+ tmp.port = state->port;
+ tmp.flags = state->tport.flags;
+ tmp.xmit_fifo_size = state->xmit_fifo_size;
+ tmp.baud_base = state->baud_base;
+ tmp.close_delay = state->tport.close_delay;
+ tmp.closing_wait = state->tport.closing_wait;
+ tmp.custom_divisor = state->custom_divisor;
+ tty_unlock(tty);
+ if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+ return -EFAULT;
+ return 0;
+}
+
+static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
+ struct serial_struct __user * new_info)
+{
+ struct tty_port *port = &state->tport;
+ struct serial_struct new_serial;
+ bool change_spd;
+ int retval = 0;
+
+ if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+ return -EFAULT;
+
+ tty_lock(tty);
+ change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
+ new_serial.custom_divisor != state->custom_divisor;
+ if (new_serial.irq || new_serial.port != state->port ||
+ new_serial.xmit_fifo_size != state->xmit_fifo_size) {
+ tty_unlock(tty);
+ return -EINVAL;
+ }
+
+ if (!serial_isroot()) {
+ if ((new_serial.baud_base != state->baud_base) ||
+ (new_serial.close_delay != port->close_delay) ||
+ (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
+ ((new_serial.flags & ~ASYNC_USR_MASK) !=
+ (port->flags & ~ASYNC_USR_MASK))) {
+ tty_unlock(tty);
+ return -EPERM;
+ }
+ port->flags = ((port->flags & ~ASYNC_USR_MASK) |
+ (new_serial.flags & ASYNC_USR_MASK));
+ state->custom_divisor = new_serial.custom_divisor;
+ goto check_and_exit;
+ }
+
+ if (new_serial.baud_base < 9600) {
+ tty_unlock(tty);
+ return -EINVAL;
+ }
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ state->baud_base = new_serial.baud_base;
+ port->flags = ((port->flags & ~ASYNC_FLAGS) |
+ (new_serial.flags & ASYNC_FLAGS));
+ state->custom_divisor = new_serial.custom_divisor;
+ port->close_delay = new_serial.close_delay * HZ/100;
+ port->closing_wait = new_serial.closing_wait * HZ/100;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+check_and_exit:
+ if (port->flags & ASYNC_INITIALIZED) {
+ if (change_spd) {
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ tty->alt_speed = 57600;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ tty->alt_speed = 115200;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ tty->alt_speed = 230400;
+ if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ tty->alt_speed = 460800;
+ change_speed(tty, state, NULL);
+ }
+ } else
+ retval = startup(tty, state);
+ tty_unlock(tty);
+ 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 serial_state *info, unsigned int __user *value)
+{
+ unsigned char status;
+ unsigned int result;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ status = custom.serdatr;
+ mb();
+ local_irq_restore(flags);
+ result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
+ if (copy_to_user(value, &result, sizeof(int)))
+ return -EFAULT;
+ return 0;
+}
+
+
+static int rs_tiocmget(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned char control, status;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ control = info->MCR;
+ local_irq_save(flags);
+ status = ciab.pra;
+ local_irq_restore(flags);
+ return ((control & SER_RTS) ? TIOCM_RTS : 0)
+ | ((control & SER_DTR) ? TIOCM_DTR : 0)
+ | (!(status & SER_DCD) ? TIOCM_CAR : 0)
+ | (!(status & SER_DSR) ? TIOCM_DSR : 0)
+ | (!(status & SER_CTS) ? TIOCM_CTS : 0);
+}
+
+static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
+ unsigned int clear)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ local_irq_save(flags);
+ if (set & TIOCM_RTS)
+ info->MCR |= SER_RTS;
+ if (set & TIOCM_DTR)
+ info->MCR |= SER_DTR;
+ if (clear & TIOCM_RTS)
+ info->MCR &= ~SER_RTS;
+ if (clear & TIOCM_DTR)
+ info->MCR &= ~SER_DTR;
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+ return 0;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static int rs_break(struct tty_struct *tty, int break_state)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_break"))
+ return -EINVAL;
+
+ local_irq_save(flags);
+ if (break_state == -1)
+ custom.adkcon = AC_SETCLR | AC_UARTBRK;
+ else
+ custom.adkcon = AC_UARTBRK;
+ mb();
+ local_irq_restore(flags);
+ return 0;
+}
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ * RI where only 0->1 is counted.
+ */
+static int rs_get_icount(struct tty_struct *tty,
+ struct serial_icounter_struct *icount)
+{
+ struct serial_state *info = tty->driver_data;
+ struct async_icount cnow;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ cnow = info->icount;
+ local_irq_restore(flags);
+ icount->cts = cnow.cts;
+ icount->dsr = cnow.dsr;
+ icount->rng = cnow.rng;
+ icount->dcd = cnow.dcd;
+ icount->rx = cnow.rx;
+ icount->tx = cnow.tx;
+ icount->frame = cnow.frame;
+ icount->overrun = cnow.overrun;
+ icount->parity = cnow.parity;
+ icount->brk = cnow.brk;
+ icount->buf_overrun = cnow.buf_overrun;
+
+ return 0;
+}
+
+static int rs_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct serial_state *info = tty->driver_data;
+ struct async_icount cprev, cnow; /* kernel counter temps */
+ void __user *argp = (void __user *)arg;
+ unsigned long flags;
+ DEFINE_WAIT(wait);
+ int ret;
+
+ if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
+ (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TIOCGSERIAL:
+ return get_serial_info(tty, info, argp);
+ case TIOCSSERIAL:
+ return set_serial_info(tty, info, argp);
+ case TIOCSERCONFIG:
+ return 0;
+
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, argp);
+
+ case TIOCSERGSTRUCT:
+ if (copy_to_user(argp,
+ info, sizeof(struct serial_state)))
+ return -EFAULT;
+ return 0;
+
+ /*
+ * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+ * - mask passed in arg for lines of interest
+ * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ */
+ case TIOCMIWAIT:
+ local_irq_save(flags);
+ /* note the counters on entry */
+ cprev = info->icount;
+ local_irq_restore(flags);
+ while (1) {
+ prepare_to_wait(&info->tport.delta_msr_wait,
+ &wait, TASK_INTERRUPTIBLE);
+ local_irq_save(flags);
+ cnow = info->icount; /* atomic copy */
+ local_irq_restore(flags);
+ if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
+ cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
+ ret = -EIO; /* no change => error */
+ break;
+ }
+ if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+ ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+ ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
+ ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
+ ret = 0;
+ break;
+ }
+ schedule();
+ /* see if a signal did it */
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ cprev = cnow;
+ }
+ finish_wait(&info->tport.delta_msr_wait, &wait);
+ return ret;
+
+ case TIOCSERGWILD:
+ case TIOCSERSWILD:
+ /* "setserial -W" is called in Debian boot */
+ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long flags;
+ unsigned int cflag = tty->termios.c_cflag;
+
+ change_speed(tty, info, old_termios);
+
+ /* Handle transition to B0 status */
+ if ((old_termios->c_cflag & CBAUD) &&
+ !(cflag & CBAUD)) {
+ info->MCR &= ~(SER_DTR|SER_RTS);
+ local_irq_save(flags);
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+ }
+
+ /* Handle transition away from B0 status */
+ if (!(old_termios->c_cflag & CBAUD) &&
+ (cflag & CBAUD)) {
+ info->MCR |= SER_DTR;
+ if (!(tty->termios.c_cflag & CRTSCTS) ||
+ !test_bit(TTY_THROTTLED, &tty->flags)) {
+ info->MCR |= SER_RTS;
+ }
+ local_irq_save(flags);
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+ }
+
+ /* Handle turning off CRTSCTS */
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios.c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_start(tty);
+ }
+
+#if 0
+ /*
+ * No need to wake up processes in open wait, since they
+ * sample the CLOCAL flag once, and don't recheck it.
+ * XXX It's not clear whether the current behavior is correct
+ * or not. Hence, this may change.....
+ */
+ if (!(old_termios->c_cflag & CLOCAL) &&
+ (tty->termios.c_cflag & CLOCAL))
+ wake_up_interruptible(&info->open_wait);
+#endif
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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
+ * async 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 serial_state *state = tty->driver_data;
+ struct tty_port *port = &state->tport;
+
+ if (serial_paranoia_check(state, tty->name, "rs_close"))
+ return;
+
+ if (tty_port_close_start(port, tty, filp) == 0)
+ return;
+
+ /*
+ * 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.
+ */
+ state->read_status_mask &= ~UART_LSR_DR;
+ if (port->flags & ASYNC_INITIALIZED) {
+ /* disable receive interrupts */
+ custom.intena = IF_RBF;
+ mb();
+ /* clear any pending receive interrupt */
+ custom.intreq = IF_RBF;
+ mb();
+
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important if there is a transmit FIFO!
+ */
+ rs_wait_until_sent(tty, state->timeout);
+ }
+ shutdown(tty, state);
+ rs_flush_buffer(tty);
+
+ tty_ldisc_flush(tty);
+ port->tty = NULL;
+
+ tty_port_close_end(port, tty);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ struct serial_state *info = tty->driver_data;
+ unsigned long orig_jiffies, char_time;
+ int lsr;
+
+ if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
+ return;
+
+ if (info->xmit_fifo_size == 0)
+ return; /* Just in case.... */
+
+ orig_jiffies = jiffies;
+
+ /*
+ * Set the check interval to be 1/5 of the estimated time to
+ * send a single character, 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.
+ */
+ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
+ char_time = char_time / 5;
+ if (char_time == 0)
+ char_time = 1;
+ if (timeout)
+ char_time = min_t(unsigned long, char_time, timeout);
+ /*
+ * If the transmitter hasn't cleared in twice the approximate
+ * amount of time to send the entire FIFO, it probably won't
+ * ever clear. This assumes the UART isn't doing flow
+ * control, which is currently the case. Hence, if it ever
+ * takes longer than info->timeout, this is probably due to a
+ * UART bug of some kind. So, we clamp the timeout parameter at
+ * 2*info->timeout.
+ */
+ if (!timeout || timeout > 2*info->timeout)
+ timeout = 2*info->timeout;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
+ printk("jiff=%lu...", jiffies);
+#endif
+ while(!((lsr = custom.serdatr) & SDR_TSRE)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+ msleep_interruptible(jiffies_to_msecs(char_time));
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+ __set_current_state(TASK_RUNNING);
+
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_hangup(struct tty_struct *tty)
+{
+ struct serial_state *info = tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+ return;
+
+ rs_flush_buffer(tty);
+ shutdown(tty, info);
+ info->tport.count = 0;
+ info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
+ info->tport.tty = NULL;
+ wake_up_interruptible(&info->tport.open_wait);
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct serial_state *info = rs_table + tty->index;
+ struct tty_port *port = &info->tport;
+ int retval;
+
+ port->count++;
+ port->tty = tty;
+ tty->driver_data = info;
+ tty->port = port;
+ if (serial_paranoia_check(info, tty->name, "rs_open"))
+ return -ENODEV;
+
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+ retval = startup(tty, info);
+ if (retval) {
+ return retval;
+ }
+
+ return tty_port_block_til_ready(port, tty, filp);
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline void line_info(struct seq_file *m, int line,
+ struct serial_state *state)
+{
+ char stat_buf[30], control, status;
+ unsigned long flags;
+
+ seq_printf(m, "%d: uart:amiga_builtin", line);
+
+ local_irq_save(flags);
+ status = ciab.pra;
+ control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
+ local_irq_restore(flags);
+
+ stat_buf[0] = 0;
+ stat_buf[1] = 0;
+ if(!(control & SER_RTS))
+ strcat(stat_buf, "|RTS");
+ if(!(status & SER_CTS))
+ strcat(stat_buf, "|CTS");
+ if(!(control & SER_DTR))
+ strcat(stat_buf, "|DTR");
+ if(!(status & SER_DSR))
+ strcat(stat_buf, "|DSR");
+ if(!(status & SER_DCD))
+ strcat(stat_buf, "|CD");
+
+ if (state->quot)
+ seq_printf(m, " baud:%d", state->baud_base / state->quot);
+
+ seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
+
+ if (state->icount.frame)
+ seq_printf(m, " fe:%d", state->icount.frame);
+
+ if (state->icount.parity)
+ seq_printf(m, " pe:%d", state->icount.parity);
+
+ if (state->icount.brk)
+ seq_printf(m, " brk:%d", state->icount.brk);
+
+ if (state->icount.overrun)
+ seq_printf(m, " oe:%d", state->icount.overrun);
+
+ /*
+ * Last thing is the RS-232 status lines
+ */
+ seq_printf(m, " %s\n", stat_buf+1);
+}
+
+static int rs_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
+ line_info(m, 0, &rs_table[0]);
+ return 0;
+}
+
+static int rs_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rs_proc_show, NULL);
+}
+
+static const struct file_operations rs_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = rs_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+static void show_serial_version(void)
+{
+ printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+}
+
+
+static const struct tty_operations serial_ops = {
+ .open = rs_open,
+ .close = rs_close,
+ .write = rs_write,
+ .put_char = rs_put_char,
+ .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,
+ .break_ctl = rs_break,
+ .send_xchar = rs_send_xchar,
+ .wait_until_sent = rs_wait_until_sent,
+ .tiocmget = rs_tiocmget,
+ .tiocmset = rs_tiocmset,
+ .get_icount = rs_get_icount,
+ .proc_fops = &rs_proc_fops,
+};
+
+static int amiga_carrier_raised(struct tty_port *port)
+{
+ return !(ciab.pra & SER_DCD);
+}
+
+static void amiga_dtr_rts(struct tty_port *port, int raise)
+{
+ struct serial_state *info = container_of(port, struct serial_state,
+ tport);
+ unsigned long flags;
+
+ if (raise)
+ info->MCR |= SER_DTR|SER_RTS;
+ else
+ info->MCR &= ~(SER_DTR|SER_RTS);
+
+ local_irq_save(flags);
+ rtsdtr_ctrl(info->MCR);
+ local_irq_restore(flags);
+}
+
+static const struct tty_port_operations amiga_port_ops = {
+ .carrier_raised = amiga_carrier_raised,
+ .dtr_rts = amiga_dtr_rts,
+};
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+static int __init amiga_serial_probe(struct platform_device *pdev)
+{
+ unsigned long flags;
+ struct serial_state * state;
+ int error;
+
+ serial_driver = alloc_tty_driver(NR_PORTS);
+ if (!serial_driver)
+ return -ENOMEM;
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+
+ serial_driver->driver_name = "amiserial";
+ 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 =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(serial_driver, &serial_ops);
+
+ state = rs_table;
+ state->port = (int)&custom.serdatr; /* Just to give it a value */
+ state->custom_divisor = 0;
+ state->icount.cts = state->icount.dsr =
+ state->icount.rng = state->icount.dcd = 0;
+ state->icount.rx = state->icount.tx = 0;
+ state->icount.frame = state->icount.parity = 0;
+ state->icount.overrun = state->icount.brk = 0;
+ tty_port_init(&state->tport);
+ state->tport.ops = &amiga_port_ops;
+ tty_port_link_device(&state->tport, serial_driver, 0);
+
+ error = tty_register_driver(serial_driver);
+ if (error)
+ goto fail_put_tty_driver;
+
+ printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
+
+ /* Hardware set up */
+
+ state->baud_base = amiga_colorclock;
+ state->xmit_fifo_size = 1;
+
+ /* set ISRs, and then disable the rx interrupts */
+ error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
+ if (error)
+ goto fail_unregister;
+
+ error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
+ "serial RX", state);
+ if (error)
+ goto fail_free_irq;
+
+ local_irq_save(flags);
+
+ /* turn off Rx and Tx interrupts */
+ custom.intena = IF_RBF | IF_TBE;
+ mb();
+
+ /* clear any pending interrupt */
+ custom.intreq = IF_RBF | IF_TBE;
+ mb();
+
+ local_irq_restore(flags);
+
+ /*
+ * set the appropriate directions for the modem control flags,
+ * and clear RTS and DTR
+ */
+ ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
+ ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
+
+ platform_set_drvdata(pdev, state);
+
+ return 0;
+
+fail_free_irq:
+ free_irq(IRQ_AMIGA_TBE, state);
+fail_unregister:
+ tty_unregister_driver(serial_driver);
+fail_put_tty_driver:
+ tty_port_destroy(&state->tport);
+ put_tty_driver(serial_driver);
+ return error;
+}
+
+static int __exit amiga_serial_remove(struct platform_device *pdev)
+{
+ int error;
+ struct serial_state *state = platform_get_drvdata(pdev);
+
+ /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
+ if ((error = tty_unregister_driver(serial_driver)))
+ printk("SERIAL: failed to unregister serial driver (%d)\n",
+ error);
+ put_tty_driver(serial_driver);
+ tty_port_destroy(&state->tport);
+
+ free_irq(IRQ_AMIGA_TBE, state);
+ free_irq(IRQ_AMIGA_RBF, state);
+
+ return error;
+}
+
+static struct platform_driver amiga_serial_driver = {
+ .remove = __exit_p(amiga_serial_remove),
+ .driver = {
+ .name = "amiga-serial",
+ },
+};
+
+module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
+
+
+#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+
+static void amiga_serial_putc(char c)
+{
+ custom.serdat = (unsigned char)c | 0x100;
+ while (!(custom.serdatr & 0x2000))
+ barrier();
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ * The console must be locked when we get here.
+ */
+static void serial_console_write(struct console *co, const char *s,
+ unsigned count)
+{
+ unsigned short intena = custom.intenar;
+
+ custom.intena = IF_TBE;
+
+ while (count--) {
+ if (*s == '\n')
+ amiga_serial_putc('\r');
+ amiga_serial_putc(*s++);
+ }
+
+ custom.intena = IF_SETCLR | (intena & IF_TBE);
+}
+
+static struct tty_driver *serial_console_device(struct console *c, int *index)
+{
+ *index = 0;
+ return serial_driver;
+}
+
+static struct console sercons = {
+ .name = "ttyS",
+ .write = serial_console_write,
+ .device = serial_console_device,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+/*
+ * Register console.
+ */
+static int __init amiserial_console_init(void)
+{
+ if (!MACH_IS_AMIGA)
+ return -ENODEV;
+
+ register_console(&sercons);
+ return 0;
+}
+console_initcall(amiserial_console_init);
+
+#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-serial");
Code Review / kvmfornfv.git / blobdiff