+++ /dev/null
-/*
- * macserial.c: Serial port driver for Power Macintoshes.
- *
- * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
- *
- * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- * Receive DMA code by Takashi Oe <toe@unlserve.unl.edu>.
- *
- * $Id: macserial.c,v 1.24.2.4 1999/10/19 04:36:42 paulus Exp $
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#ifdef CONFIG_SERIAL_CONSOLE
-#include <linux/console.h>
-#endif
-#include <linux/slab.h>
-#include <linux/bitops.h>
-
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/irq.h>
-#include <asm/prom.h>
-#include <asm/system.h>
-#include <asm/segment.h>
-#include <asm/machdep.h>
-#include <asm/pmac_feature.h>
-#include <linux/adb.h>
-#include <linux/pmu.h>
-#ifdef CONFIG_KGDB
-#include <asm/kgdb.h>
-#endif
-#include <asm/dbdma.h>
-
-#include "macserial.h"
-
-#ifdef CONFIG_PMAC_PBOOK
-static int serial_notify_sleep(struct pmu_sleep_notifier *self, int when);
-static struct pmu_sleep_notifier serial_sleep_notifier = {
- serial_notify_sleep,
- SLEEP_LEVEL_MISC,
-};
-#endif
-
-#define SUPPORT_SERIAL_DMA
-#define MACSERIAL_VERSION "2.0"
-
-/*
- * It would be nice to dynamically allocate everything that
- * depends on NUM_SERIAL, so we could support any number of
- * Z8530s, but for now...
- */
-#define NUM_SERIAL 2 /* Max number of ZS chips supported */
-#define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
-
-/* On PowerMacs, the hardware takes care of the SCC recovery time,
- but we need the eieio to make sure that the accesses occur
- in the order we want. */
-#define RECOVERY_DELAY eieio()
-
-static struct tty_driver *serial_driver;
-
-struct mac_zschannel zs_channels[NUM_CHANNELS];
-
-struct mac_serial zs_soft[NUM_CHANNELS];
-int zs_channels_found;
-struct mac_serial *zs_chain; /* list of all channels */
-
-struct tty_struct zs_ttys[NUM_CHANNELS];
-
-static int is_powerbook;
-
-#ifdef CONFIG_SERIAL_CONSOLE
-static struct console sercons;
-#endif
-
-#ifdef CONFIG_KGDB
-struct mac_zschannel *zs_kgdbchan;
-static unsigned char scc_inittab[] = {
- 9, 0x80, /* reset A side (CHRA) */
- 13, 0, /* set baud rate divisor */
- 12, 1,
- 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
- 11, 0x50, /* clocks = br gen (RCBR | TCBR) */
- 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
- 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
- 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
-};
-#endif
-#define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */
-
-/* serial subtype definitions */
-#define SERIAL_TYPE_NORMAL 1
-
-/* number of characters left in xmit buffer before we ask for more */
-#define WAKEUP_CHARS 256
-
-/*
- * Debugging.
- */
-#undef SERIAL_DEBUG_INTR
-#undef SERIAL_DEBUG_OPEN
-#undef SERIAL_DEBUG_FLOW
-#undef SERIAL_DEBUG_POWER
-#undef SERIAL_DEBUG_THROTTLE
-#undef SERIAL_DEBUG_STOP
-#undef SERIAL_DEBUG_BAUDS
-
-#define RS_STROBE_TIME 10
-#define RS_ISR_PASS_LIMIT 256
-
-#define _INLINE_ inline
-
-#ifdef SERIAL_DEBUG_OPEN
-#define OPNDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
-#else
-#define OPNDBG(fmt, arg...) do { } while (0)
-#endif
-#ifdef SERIAL_DEBUG_POWER
-#define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
-#else
-#define PWRDBG(fmt, arg...) do { } while (0)
-#endif
-#ifdef SERIAL_DEBUG_BAUDS
-#define BAUDBG(fmt, arg...) printk(fmt , ## arg)
-#else
-#define BAUDBG(fmt, arg...) do { } while (0)
-#endif
-
-static void probe_sccs(void);
-static void change_speed(struct mac_serial *info, struct termios *old);
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
-static int set_scc_power(struct mac_serial * info, int state);
-static int setup_scc(struct mac_serial * info);
-static void dbdma_reset(volatile struct dbdma_regs *dma);
-static void dbdma_flush(volatile struct dbdma_regs *dma);
-static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs);
-static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs);
-static void dma_init(struct mac_serial * info);
-static void rxdma_start(struct mac_serial * info, int curr);
-static void rxdma_to_tty(struct mac_serial * info);
-
-/*
- * tmp_buf is used as a temporary buffer by serial_write. We need to
- * lock it in case the copy_from_user blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
-static unsigned char *tmp_buf;
-static DECLARE_MUTEX(tmp_buf_sem);
-
-
-static inline int __pmac
-serial_paranoia_check(struct mac_serial *info,
- char *name, const char *routine)
-{
-#ifdef SERIAL_PARANOIA_CHECK
- static const char badmagic[] = KERN_WARNING
- "Warning: bad magic number for serial struct %s in %s\n";
- static const char badinfo[] = KERN_WARNING
- "Warning: null mac_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;
-}
-
-/*
- * Reading and writing Z8530 registers.
- */
-static inline unsigned char __pmac read_zsreg(struct mac_zschannel *channel,
- unsigned char reg)
-{
- unsigned char retval;
- unsigned long flags;
-
- /*
- * We have to make this atomic.
- */
- spin_lock_irqsave(&channel->lock, flags);
- if (reg != 0) {
- *channel->control = reg;
- RECOVERY_DELAY;
- }
- retval = *channel->control;
- RECOVERY_DELAY;
- spin_unlock_irqrestore(&channel->lock, flags);
- return retval;
-}
-
-static inline void __pmac write_zsreg(struct mac_zschannel *channel,
- unsigned char reg, unsigned char value)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&channel->lock, flags);
- if (reg != 0) {
- *channel->control = reg;
- RECOVERY_DELAY;
- }
- *channel->control = value;
- RECOVERY_DELAY;
- spin_unlock_irqrestore(&channel->lock, flags);
- return;
-}
-
-static inline unsigned char __pmac read_zsdata(struct mac_zschannel *channel)
-{
- unsigned char retval;
-
- retval = *channel->data;
- RECOVERY_DELAY;
- return retval;
-}
-
-static inline void write_zsdata(struct mac_zschannel *channel,
- unsigned char value)
-{
- *channel->data = value;
- RECOVERY_DELAY;
- return;
-}
-
-static inline void load_zsregs(struct mac_zschannel *channel,
- unsigned char *regs)
-{
- ZS_CLEARERR(channel);
- ZS_CLEARFIFO(channel);
- /* Load 'em up */
- write_zsreg(channel, R4, regs[R4]);
- write_zsreg(channel, R10, regs[R10]);
- write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
- write_zsreg(channel, R5, regs[R5] & ~TxENAB);
- write_zsreg(channel, R1, regs[R1]);
- write_zsreg(channel, R9, regs[R9]);
- write_zsreg(channel, R11, regs[R11]);
- write_zsreg(channel, R12, regs[R12]);
- write_zsreg(channel, R13, regs[R13]);
- write_zsreg(channel, R14, regs[R14]);
- write_zsreg(channel, R15, regs[R15]);
- write_zsreg(channel, R3, regs[R3]);
- write_zsreg(channel, R5, regs[R5]);
- return;
-}
-
-/* Sets or clears DTR/RTS on the requested line */
-static inline void zs_rtsdtr(struct mac_serial *ss, int set)
-{
- if (set)
- ss->curregs[5] |= (RTS | DTR);
- else
- ss->curregs[5] &= ~(RTS | DTR);
- write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
- return;
-}
-
-/* Utility routines for the Zilog */
-static inline int get_zsbaud(struct mac_serial *ss)
-{
- struct mac_zschannel *channel = ss->zs_channel;
- int brg;
-
- if ((ss->curregs[R11] & TCBR) == 0) {
- /* higher rates don't use the baud rate generator */
- return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16;
- }
- /* The baud rate is split up between two 8-bit registers in
- * what is termed 'BRG time constant' format in my docs for
- * the chip, it is a function of the clk rate the chip is
- * receiving which happens to be constant.
- */
- brg = (read_zsreg(channel, 13) << 8);
- brg |= read_zsreg(channel, 12);
- return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
-}
-
-/* On receive, this clears errors and the receiver interrupts */
-static inline void rs_recv_clear(struct mac_zschannel *zsc)
-{
- write_zsreg(zsc, 0, ERR_RES);
- write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
-}
-
-/*
- * Reset a Descriptor-Based DMA channel.
- */
-static void dbdma_reset(volatile struct dbdma_regs *dma)
-{
- int i;
-
- out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
-
- /*
- * Yes this looks peculiar, but apparently it needs to be this
- * way on some machines. (We need to make sure the DBDMA
- * engine has actually got the write above and responded
- * to it. - paulus)
- */
- for (i = 200; i > 0; --i)
- if (ld_le32(&dma->status) & RUN)
- udelay(1);
-}
-
-/*
- * Tells a DBDMA channel to stop and write any buffered data
- * it might have to memory.
- */
-static _INLINE_ void dbdma_flush(volatile struct dbdma_regs *dma)
-{
- int i = 0;
-
- out_le32(&dma->control, (FLUSH << 16) | FLUSH);
- while (((in_le32(&dma->status) & FLUSH) != 0) && (i++ < 100))
- udelay(1);
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * 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.
- *
- * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
- * -----------------------------------------------------------------------
- */
-
-/*
- * This routine is used by the interrupt handler to schedule
- * processing in the software interrupt portion of the driver.
- */
-static _INLINE_ void rs_sched_event(struct mac_serial *info,
- int event)
-{
- info->event |= 1 << event;
- schedule_work(&info->tqueue);
-}
-
-/* Work out the flag value for a z8530 status value. */
-static _INLINE_ int stat_to_flag(int stat)
-{
- int flag;
-
- if (stat & Rx_OVR) {
- flag = TTY_OVERRUN;
- } else if (stat & FRM_ERR) {
- flag = TTY_FRAME;
- } else if (stat & PAR_ERR) {
- flag = TTY_PARITY;
- } else
- flag = 0;
- return flag;
-}
-
-static _INLINE_ void receive_chars(struct mac_serial *info,
- struct pt_regs *regs)
-{
- struct tty_struct *tty = info->tty;
- unsigned char ch, stat, flag;
-
- while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) {
-
- stat = read_zsreg(info->zs_channel, R1);
- ch = read_zsdata(info->zs_channel);
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel) {
- if (ch == 0x03 || ch == '$')
- breakpoint();
- if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
- write_zsreg(info->zs_channel, 0, ERR_RES);
- return;
- }
-#endif
- if (!tty)
- continue;
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- tty_flip_buffer_push(tty);
-
- if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
- static int flip_buf_ovf;
- if (++flip_buf_ovf <= 1)
- printk(KERN_WARNING "FB. overflow: %d\n",
- flip_buf_ovf);
- break;
- }
- tty->flip.count++;
- {
- static int flip_max_cnt;
- if (flip_max_cnt < tty->flip.count)
- flip_max_cnt = tty->flip.count;
- }
- flag = stat_to_flag(stat);
- if (flag)
- /* reset the error indication */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- *tty->flip.flag_buf_ptr++ = flag;
- *tty->flip.char_buf_ptr++ = ch;
- }
- if (tty)
- tty_flip_buffer_push(tty);
-}
-
-static void transmit_chars(struct mac_serial *info)
-{
- if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0)
- return;
- info->tx_active = 0;
-
- if (info->x_char && !info->power_wait) {
- /* Send next char */
- write_zsdata(info->zs_channel, info->x_char);
- info->x_char = 0;
- info->tx_active = 1;
- return;
- }
-
- if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped
- || info->power_wait) {
- write_zsreg(info->zs_channel, 0, RES_Tx_P);
- return;
- }
-
- /* Send char */
- write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- info->tx_active = 1;
-
- if (info->xmit_cnt < WAKEUP_CHARS)
- rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
-}
-
-static void powerup_done(unsigned long data)
-{
- struct mac_serial *info = (struct mac_serial *) data;
- unsigned long flags;
-
- spin_lock_irqsave(&info->lock, flags);
- info->power_wait = 0;
- transmit_chars(info);
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static _INLINE_ void status_handle(struct mac_serial *info)
-{
- unsigned char status;
-
- /* Get status from Read Register 0 */
- status = read_zsreg(info->zs_channel, 0);
-
- /* Check for DCD transitions */
- if (((status ^ info->read_reg_zero) & DCD) != 0
- && info->tty && !C_CLOCAL(info->tty)) {
- if (status & DCD) {
- wake_up_interruptible(&info->open_wait);
- } else {
- if (info->tty)
- tty_hangup(info->tty);
- }
- }
-
- /* Check for CTS transitions */
- if (info->tty && C_CRTSCTS(info->tty)) {
- /*
- * For some reason, on the Power Macintosh,
- * it seems that the CTS bit is 1 when CTS is
- * *negated* and 0 when it is asserted.
- * The DCD bit doesn't seem to be inverted
- * like this.
- */
- if ((status & CTS) == 0) {
- if (info->tx_stopped) {
-#ifdef SERIAL_DEBUG_FLOW
- printk(KERN_DEBUG "CTS up\n");
-#endif
- info->tx_stopped = 0;
- if (!info->tx_active)
- transmit_chars(info);
- }
- } else {
-#ifdef SERIAL_DEBUG_FLOW
- printk(KERN_DEBUG "CTS down\n");
-#endif
- info->tx_stopped = 1;
- }
- }
-
- /* Clear status condition... */
- write_zsreg(info->zs_channel, 0, RES_EXT_INT);
- info->read_reg_zero = status;
-}
-
-static _INLINE_ void receive_special_dma(struct mac_serial *info)
-{
- unsigned char stat, flag;
- volatile struct dbdma_regs *rd = &info->rx->dma;
- int where = RX_BUF_SIZE;
-
- spin_lock(&info->rx_dma_lock);
- if ((ld_le32(&rd->status) & ACTIVE) != 0)
- dbdma_flush(rd);
- if (in_le32(&rd->cmdptr)
- == virt_to_bus(info->rx_cmds[info->rx_cbuf] + 1))
- where -= in_le16(&info->rx->res_count);
- where--;
-
- stat = read_zsreg(info->zs_channel, R1);
-
- flag = stat_to_flag(stat);
- if (flag) {
- info->rx_flag_buf[info->rx_cbuf][where] = flag;
- /* reset the error indication */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- }
-
- spin_unlock(&info->rx_dma_lock);
-}
-
-/*
- * This is the serial driver's generic interrupt routine
- */
-static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
- struct mac_serial *info = (struct mac_serial *) dev_id;
- unsigned char zs_intreg;
- int shift;
- unsigned long flags;
- int handled = 0;
-
- if (!(info->flags & ZILOG_INITIALIZED)) {
- printk(KERN_WARNING "rs_interrupt: irq %d, port not "
- "initialized\n", irq);
- disable_irq(irq);
- return IRQ_NONE;
- }
-
- /* NOTE: The read register 3, which holds the irq status,
- * does so for both channels on each chip. Although
- * the status value itself must be read from the A
- * channel and is only valid when read from channel A.
- * Yes... broken hardware...
- */
-#define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
-
- if (info->zs_chan_a == info->zs_channel)
- shift = 3; /* Channel A */
- else
- shift = 0; /* Channel B */
-
- spin_lock_irqsave(&info->lock, flags);
- for (;;) {
- zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift;
-#ifdef SERIAL_DEBUG_INTR
- printk(KERN_DEBUG "rs_interrupt: irq %d, zs_intreg 0x%x\n",
- irq, (int)zs_intreg);
-#endif
-
- if ((zs_intreg & CHAN_IRQMASK) == 0)
- break;
- handled = 1;
-
- if (zs_intreg & CHBRxIP) {
- /* If we are doing DMA, we only ask for interrupts
- on characters with errors or special conditions. */
- if (info->dma_initted)
- receive_special_dma(info);
- else
- receive_chars(info, regs);
- }
- if (zs_intreg & CHBTxIP)
- transmit_chars(info);
- if (zs_intreg & CHBEXT)
- status_handle(info);
- }
- spin_unlock_irqrestore(&info->lock, flags);
- return IRQ_RETVAL(handled);
-}
-
-/* Transmit DMA interrupt - not used at present */
-static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- return IRQ_HANDLED;
-}
-
-/*
- * Receive DMA interrupt.
- */
-static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- struct mac_serial *info = (struct mac_serial *) dev_id;
- volatile struct dbdma_cmd *cd;
-
- if (!info->dma_initted)
- return IRQ_NONE;
- spin_lock(&info->rx_dma_lock);
- /* First, confirm that this interrupt is, indeed, coming */
- /* from Rx DMA */
- cd = info->rx_cmds[info->rx_cbuf] + 2;
- if ((in_le16(&cd->xfer_status) & (RUN | ACTIVE)) != (RUN | ACTIVE)) {
- spin_unlock(&info->rx_dma_lock);
- return IRQ_NONE;
- }
- if (info->rx_fbuf != RX_NO_FBUF) {
- info->rx_cbuf = info->rx_fbuf;
- if (++info->rx_fbuf == info->rx_nbuf)
- info->rx_fbuf = 0;
- if (info->rx_fbuf == info->rx_ubuf)
- info->rx_fbuf = RX_NO_FBUF;
- }
- spin_unlock(&info->rx_dma_lock);
- return IRQ_HANDLED;
-}
-
-/*
- * -------------------------------------------------------------------
- * Here ends the serial interrupt routines.
- * -------------------------------------------------------------------
- */
-
-/*
- * ------------------------------------------------------------
- * rs_stop() and rs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * ------------------------------------------------------------
- */
-static void rs_stop(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
-
-#ifdef SERIAL_DEBUG_STOP
- printk(KERN_DEBUG "rs_stop %ld....\n",
- tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_stop"))
- return;
-
-#if 0
- spin_lock_irqsave(&info->lock, flags);
- if (info->curregs[5] & TxENAB) {
- info->curregs[5] &= ~TxENAB;
- info->pendregs[5] &= ~TxENAB;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- }
- spin_unlock_irqrestore(&info->lock, flags);
-#endif
-}
-
-static void rs_start(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-
-#ifdef SERIAL_DEBUG_STOP
- printk(KERN_DEBUG "rs_start %ld....\n",
- tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_start"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
-#if 0
- if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
- info->curregs[5] |= TxENAB;
- info->pendregs[5] = info->curregs[5];
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- }
-#else
- if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
- transmit_chars(info);
- }
-#endif
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void do_softint(void *private_)
-{
- struct mac_serial *info = (struct mac_serial *) private_;
- struct tty_struct *tty;
-
- tty = info->tty;
- if (!tty)
- return;
-
- if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
- tty_wakeup(tty);
-}
-
-static int startup(struct mac_serial * info)
-{
- int delay;
-
- OPNDBG("startup() (ttyS%d, irq %d)\n", info->line, info->irq);
-
- if (info->flags & ZILOG_INITIALIZED) {
- OPNDBG(" -> already inited\n");
- return 0;
- }
-
- if (!info->xmit_buf) {
- info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
- if (!info->xmit_buf)
- return -ENOMEM;
- }
-
- OPNDBG("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
-
- delay = set_scc_power(info, 1);
-
- setup_scc(info);
-
- if (delay) {
- unsigned long flags;
-
- /* delay is in ms */
- spin_lock_irqsave(&info->lock, flags);
- info->power_wait = 1;
- mod_timer(&info->powerup_timer,
- jiffies + (delay * HZ + 999) / 1000);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- OPNDBG("enabling IRQ on ttyS%d (irq %d)...\n", info->line, info->irq);
-
- info->flags |= ZILOG_INITIALIZED;
- enable_irq(info->irq);
- if (info->dma_initted) {
- enable_irq(info->rx_dma_irq);
- }
-
- return 0;
-}
-
-static _INLINE_ void rxdma_start(struct mac_serial * info, int curr)
-{
- volatile struct dbdma_regs *rd = &info->rx->dma;
- volatile struct dbdma_cmd *cd = info->rx_cmds[curr];
-
-//printk(KERN_DEBUG "SCC: rxdma_start\n");
-
- st_le32(&rd->cmdptr, virt_to_bus(cd));
- out_le32(&rd->control, (RUN << 16) | RUN);
-}
-
-static void rxdma_to_tty(struct mac_serial *info)
-{
- struct tty_struct *tty = info->tty;
- volatile struct dbdma_regs *rd = &info->rx->dma;
- unsigned long flags;
- int residue, available, space, do_queue;
-
- if (!tty)
- return;
-
- do_queue = 0;
- spin_lock_irqsave(&info->rx_dma_lock, flags);
-more:
- space = TTY_FLIPBUF_SIZE - tty->flip.count;
- if (!space) {
- do_queue++;
- goto out;
- }
- residue = 0;
- if (info->rx_ubuf == info->rx_cbuf) {
- if ((ld_le32(&rd->status) & ACTIVE) != 0) {
- dbdma_flush(rd);
- if (in_le32(&rd->cmdptr)
- == virt_to_bus(info->rx_cmds[info->rx_cbuf]+1))
- residue = in_le16(&info->rx->res_count);
- }
- }
- available = RX_BUF_SIZE - residue - info->rx_done_bytes;
- if (available > space)
- available = space;
- if (available) {
- memcpy(tty->flip.char_buf_ptr,
- info->rx_char_buf[info->rx_ubuf] + info->rx_done_bytes,
- available);
- memcpy(tty->flip.flag_buf_ptr,
- info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
- available);
- tty->flip.char_buf_ptr += available;
- tty->flip.count += available;
- tty->flip.flag_buf_ptr += available;
- memset(info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
- 0, available);
- info->rx_done_bytes += available;
- do_queue++;
- }
- if (info->rx_done_bytes == RX_BUF_SIZE) {
- volatile struct dbdma_cmd *cd = info->rx_cmds[info->rx_ubuf];
-
- if (info->rx_ubuf == info->rx_cbuf)
- goto out;
- /* mark rx_char_buf[rx_ubuf] free */
- st_le16(&cd->command, DBDMA_NOP);
- cd++;
- st_le32(&cd->cmd_dep, 0);
- st_le32((unsigned int *)&cd->res_count, 0);
- cd++;
- st_le16(&cd->xfer_status, 0);
-
- if (info->rx_fbuf == RX_NO_FBUF) {
- info->rx_fbuf = info->rx_ubuf;
- if (!(ld_le32(&rd->status) & ACTIVE)) {
- dbdma_reset(&info->rx->dma);
- rxdma_start(info, info->rx_ubuf);
- info->rx_cbuf = info->rx_ubuf;
- }
- }
- info->rx_done_bytes = 0;
- if (++info->rx_ubuf == info->rx_nbuf)
- info->rx_ubuf = 0;
- if (info->rx_fbuf == info->rx_ubuf)
- info->rx_fbuf = RX_NO_FBUF;
- goto more;
- }
-out:
- spin_unlock_irqrestore(&info->rx_dma_lock, flags);
- if (do_queue)
- tty_flip_buffer_push(tty);
-}
-
-static void poll_rxdma(unsigned long private_)
-{
- struct mac_serial *info = (struct mac_serial *) private_;
- unsigned long flags;
-
- rxdma_to_tty(info);
- spin_lock_irqsave(&info->rx_dma_lock, flags);
- mod_timer(&info->poll_dma_timer, RX_DMA_TIMER);
- spin_unlock_irqrestore(&info->rx_dma_lock, flags);
-}
-
-static void dma_init(struct mac_serial * info)
-{
- int i, size;
- volatile struct dbdma_cmd *cd;
- unsigned char *p;
-
- info->rx_nbuf = 8;
-
- /* various mem set up */
- size = sizeof(struct dbdma_cmd) * (3 * info->rx_nbuf + 2)
- + (RX_BUF_SIZE * 2 + sizeof(*info->rx_cmds)
- + sizeof(*info->rx_char_buf) + sizeof(*info->rx_flag_buf))
- * info->rx_nbuf;
- info->dma_priv = kmalloc(size, GFP_KERNEL | GFP_DMA);
- if (info->dma_priv == NULL)
- return;
- memset(info->dma_priv, 0, size);
-
- info->rx_cmds = (volatile struct dbdma_cmd **)info->dma_priv;
- info->rx_char_buf = (unsigned char **) (info->rx_cmds + info->rx_nbuf);
- info->rx_flag_buf = info->rx_char_buf + info->rx_nbuf;
- p = (unsigned char *) (info->rx_flag_buf + info->rx_nbuf);
- for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
- info->rx_char_buf[i] = p;
- for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
- info->rx_flag_buf[i] = p;
-
- /* a bit of DMA programming */
- cd = info->rx_cmds[0] = (volatile struct dbdma_cmd *) DBDMA_ALIGN(p);
- st_le16(&cd->command, DBDMA_NOP);
- cd++;
- st_le16(&cd->req_count, RX_BUF_SIZE);
- st_le16(&cd->command, INPUT_MORE);
- st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[0]));
- cd++;
- st_le16(&cd->req_count, 4);
- st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
- st_le32(&cd->phy_addr, virt_to_bus(cd-2));
- st_le32(&cd->cmd_dep, DBDMA_STOP);
- for (i = 1; i < info->rx_nbuf; i++) {
- info->rx_cmds[i] = ++cd;
- st_le16(&cd->command, DBDMA_NOP);
- cd++;
- st_le16(&cd->req_count, RX_BUF_SIZE);
- st_le16(&cd->command, INPUT_MORE);
- st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[i]));
- cd++;
- st_le16(&cd->req_count, 4);
- st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
- st_le32(&cd->phy_addr, virt_to_bus(cd-2));
- st_le32(&cd->cmd_dep, DBDMA_STOP);
- }
- cd++;
- st_le16(&cd->command, DBDMA_NOP | BR_ALWAYS);
- st_le32(&cd->cmd_dep, virt_to_bus(info->rx_cmds[0]));
-
- /* setup DMA to our liking */
- dbdma_reset(&info->rx->dma);
- st_le32(&info->rx->dma.intr_sel, 0x10001);
- st_le32(&info->rx->dma.br_sel, 0x10001);
- out_le32(&info->rx->dma.wait_sel, 0x10001);
-
- /* set various flags */
- info->rx_ubuf = 0;
- info->rx_cbuf = 0;
- info->rx_fbuf = info->rx_ubuf + 1;
- if (info->rx_fbuf == info->rx_nbuf)
- info->rx_fbuf = RX_NO_FBUF;
- info->rx_done_bytes = 0;
-
- /* setup polling */
- init_timer(&info->poll_dma_timer);
- info->poll_dma_timer.function = (void *)&poll_rxdma;
- info->poll_dma_timer.data = (unsigned long)info;
-
- info->dma_initted = 1;
-}
-
-/*
- * FixZeroBug....Works around a bug in the SCC receving channel.
- * Taken from Darwin code, 15 Sept. 2000 -DanM
- *
- * The following sequence prevents a problem that is seen with O'Hare ASICs
- * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
- * at the input to the receiver becomes 'stuck' and locks up the receiver.
- * This problem can occur as a result of a zero bit at the receiver input
- * coincident with any of the following events:
- *
- * The SCC is initialized (hardware or software).
- * A framing error is detected.
- * The clocking option changes from synchronous or X1 asynchronous
- * clocking to X16, X32, or X64 asynchronous clocking.
- * The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
- *
- * This workaround attempts to recover from the lockup condition by placing
- * the SCC in synchronous loopback mode with a fast clock before programming
- * any of the asynchronous modes.
- */
-static void fix_zero_bug_scc(struct mac_serial * info)
-{
- write_zsreg(info->zs_channel, 9,
- (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
- udelay(10);
- write_zsreg(info->zs_channel, 9,
- ((info->zs_channel == info->zs_chan_a? CHRA: CHRB) | NV));
-
- write_zsreg(info->zs_channel, 4, (X1CLK | EXTSYNC));
-
- /* I think this is wrong....but, I just copying code....
- */
- write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
-
- write_zsreg(info->zs_channel, 5, (8 & ~TxENAB));
- write_zsreg(info->zs_channel, 9, NV); /* Didn't we already do this? */
- write_zsreg(info->zs_channel, 11, (RCBR | TCBR));
- write_zsreg(info->zs_channel, 12, 0);
- write_zsreg(info->zs_channel, 13, 0);
- write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR));
- write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR | BRENABL));
- write_zsreg(info->zs_channel, 3, (8 | RxENABLE));
- write_zsreg(info->zs_channel, 0, RES_EXT_INT);
- write_zsreg(info->zs_channel, 0, RES_EXT_INT); /* to kill some time */
-
- /* The channel should be OK now, but it is probably receiving
- * loopback garbage.
- * Switch to asynchronous mode, disable the receiver,
- * and discard everything in the receive buffer.
- */
- write_zsreg(info->zs_channel, 9, NV);
- write_zsreg(info->zs_channel, 4, PAR_ENA);
- write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
-
- while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) {
- (void)read_zsreg(info->zs_channel, 8);
- write_zsreg(info->zs_channel, 0, RES_EXT_INT);
- write_zsreg(info->zs_channel, 0, ERR_RES);
- }
-}
-
-static int setup_scc(struct mac_serial * info)
-{
- unsigned long flags;
-
- OPNDBG("setting up ttyS%d SCC...\n", info->line);
-
- spin_lock_irqsave(&info->lock, flags);
-
- /* Nice buggy HW ... */
- fix_zero_bug_scc(info);
-
- /*
- * Reset the chip.
- */
- write_zsreg(info->zs_channel, 9,
- (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
- udelay(10);
- write_zsreg(info->zs_channel, 9, 0);
-
- /*
- * Clear the receive FIFO.
- */
- ZS_CLEARFIFO(info->zs_channel);
- info->xmit_fifo_size = 1;
-
- /*
- * Reset DMAs
- */
- if (info->has_dma)
- dma_init(info);
-
- /*
- * Clear the interrupt registers.
- */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- write_zsreg(info->zs_channel, 0, RES_H_IUS);
-
- /*
- * Turn on RTS and DTR.
- */
- if (!info->is_irda)
- zs_rtsdtr(info, 1);
-
- /*
- * Finally, enable sequencing and interrupts
- */
- if (!info->dma_initted) {
- /* interrupt on ext/status changes, all received chars,
- transmit ready */
- info->curregs[1] = (info->curregs[1] & ~0x18)
- | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
- } else {
- /* interrupt on ext/status changes, W/Req pin is
- receive DMA request */
- info->curregs[1] = (info->curregs[1] & ~(0x18 | TxINT_ENAB))
- | (EXT_INT_ENAB | WT_RDY_RT | WT_FN_RDYFN);
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- /* enable W/Req pin */
- info->curregs[1] |= WT_RDY_ENAB;
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- /* enable interrupts on transmit ready and receive errors */
- info->curregs[1] |= INT_ERR_Rx | TxINT_ENAB;
- }
- info->pendregs[1] = info->curregs[1];
- info->curregs[3] |= (RxENABLE | Rx8);
- info->pendregs[3] = info->curregs[3];
- info->curregs[5] |= (TxENAB | Tx8);
- info->pendregs[5] = info->curregs[5];
- info->curregs[9] |= (NV | MIE);
- info->pendregs[9] = info->curregs[9];
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- write_zsreg(info->zs_channel, 9, info->curregs[9]);
-
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- /*
- * Set the speed of the serial port
- */
- change_speed(info, 0);
-
- /* Save the current value of RR0 */
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
-
- if (info->dma_initted) {
- spin_lock_irqsave(&info->rx_dma_lock, flags);
- rxdma_start(info, 0);
- info->poll_dma_timer.expires = RX_DMA_TIMER;
- add_timer(&info->poll_dma_timer);
- spin_unlock_irqrestore(&info->rx_dma_lock, 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 mac_serial * info)
-{
- OPNDBG("Shutting down serial port %d (irq %d)....\n", info->line,
- info->irq);
-
- if (!(info->flags & ZILOG_INITIALIZED)) {
- OPNDBG("(already shutdown)\n");
- return;
- }
-
- if (info->has_dma) {
- del_timer(&info->poll_dma_timer);
- dbdma_reset(info->tx_dma);
- dbdma_reset(&info->rx->dma);
- disable_irq(info->tx_dma_irq);
- disable_irq(info->rx_dma_irq);
- }
- disable_irq(info->irq);
-
- info->pendregs[1] = info->curregs[1] = 0;
- write_zsreg(info->zs_channel, 1, 0); /* no interrupts */
-
- info->curregs[3] &= ~RxENABLE;
- info->pendregs[3] = info->curregs[3];
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
-
- info->curregs[5] &= ~TxENAB;
- if (!info->tty || C_HUPCL(info->tty))
- info->curregs[5] &= ~DTR;
- info->pendregs[5] = info->curregs[5];
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
-
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- set_scc_power(info, 0);
-
- if (info->xmit_buf) {
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = 0;
- }
-
- if (info->has_dma && info->dma_priv) {
- kfree(info->dma_priv);
- info->dma_priv = NULL;
- info->dma_initted = 0;
- }
-
- memset(info->curregs, 0, sizeof(info->curregs));
- memset(info->pendregs, 0, sizeof(info->pendregs));
-
- info->flags &= ~ZILOG_INITIALIZED;
-}
-
-/*
- * Turn power on or off to the SCC and associated stuff
- * (port drivers, modem, IR port, etc.)
- * Returns the number of milliseconds we should wait before
- * trying to use the port.
- */
-static int set_scc_power(struct mac_serial * info, int state)
-{
- int delay = 0;
-
- if (state) {
- PWRDBG("ttyS%d: powering up hardware\n", info->line);
- pmac_call_feature(
- PMAC_FTR_SCC_ENABLE,
- info->dev_node, info->port_type, 1);
- if (info->is_internal_modem) {
- pmac_call_feature(
- PMAC_FTR_MODEM_ENABLE,
- info->dev_node, 0, 1);
- delay = 2500; /* wait for 2.5s before using */
- } else if (info->is_irda)
- mdelay(50); /* Do better here once the problems
- * with blocking have been ironed out
- */
- } else {
- /* TODO: Make that depend on a timer, don't power down
- * immediately
- */
- PWRDBG("ttyS%d: shutting down hardware\n", info->line);
- if (info->is_internal_modem) {
- PWRDBG("ttyS%d: shutting down modem\n", info->line);
- pmac_call_feature(
- PMAC_FTR_MODEM_ENABLE,
- info->dev_node, 0, 0);
- }
- pmac_call_feature(
- PMAC_FTR_SCC_ENABLE,
- info->dev_node, info->port_type, 0);
- }
- return delay;
-}
-
-static void irda_rts_pulses(struct mac_serial *info, int w)
-{
- udelay(w);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
- udelay(2);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
- udelay(8);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
- udelay(4);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
-}
-
-/*
- * Set the irda codec on the imac to the specified baud rate.
- */
-static void irda_setup(struct mac_serial *info)
-{
- int code, speed, t;
-
- speed = info->tty->termios->c_cflag & CBAUD;
- if (speed < B2400 || speed > B115200)
- return;
- code = 0x4d + B115200 - speed;
-
- /* disable serial interrupts and receive DMA */
- write_zsreg(info->zs_channel, 1, info->curregs[1] & ~0x9f);
-
- /* wait for transmitter to drain */
- t = 10000;
- while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0
- || (read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
- if (--t <= 0) {
- printk(KERN_ERR "transmitter didn't drain\n");
- return;
- }
- udelay(10);
- }
- udelay(100);
-
- /* set to 8 bits, no parity, 19200 baud, RTS on, DTR off */
- write_zsreg(info->zs_channel, 4, X16CLK | SB1);
- write_zsreg(info->zs_channel, 11, TCBR | RCBR);
- t = BPS_TO_BRG(19200, ZS_CLOCK/16);
- write_zsreg(info->zs_channel, 12, t);
- write_zsreg(info->zs_channel, 13, t >> 8);
- write_zsreg(info->zs_channel, 14, BRENABL);
- write_zsreg(info->zs_channel, 3, Rx8 | RxENABLE);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
-
- /* set TxD low for ~104us and pulse RTS */
- udelay(1000);
- write_zsdata(info->zs_channel, 0xfe);
- irda_rts_pulses(info, 150);
- irda_rts_pulses(info, 180);
- irda_rts_pulses(info, 50);
- udelay(100);
-
- /* assert DTR, wait 30ms, talk to the chip */
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS | DTR);
- mdelay(30);
- while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV)
- read_zsdata(info->zs_channel);
-
- write_zsdata(info->zs_channel, 1);
- t = 1000;
- while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
- if (--t <= 0) {
- printk(KERN_ERR "irda_setup timed out on 1st byte\n");
- goto out;
- }
- udelay(10);
- }
- t = read_zsdata(info->zs_channel);
- if (t != 4)
- printk(KERN_ERR "irda_setup 1st byte = %x\n", t);
-
- write_zsdata(info->zs_channel, code);
- t = 1000;
- while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
- if (--t <= 0) {
- printk(KERN_ERR "irda_setup timed out on 2nd byte\n");
- goto out;
- }
- udelay(10);
- }
- t = read_zsdata(info->zs_channel);
- if (t != code)
- printk(KERN_ERR "irda_setup 2nd byte = %x (%x)\n", t, code);
-
- /* Drop DTR again and do some more RTS pulses */
- out:
- udelay(100);
- write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
- irda_rts_pulses(info, 80);
-
- /* We should be right to go now. We assume that load_zsregs
- will get called soon to load up the correct baud rate etc. */
- info->curregs[5] = (info->curregs[5] | RTS) & ~DTR;
- info->pendregs[5] = info->curregs[5];
-}
-
-/*
- * 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 mac_serial *info, struct termios *old_termios)
-{
- unsigned cflag;
- int bits;
- int brg, baud;
- unsigned long flags;
-
- if (!info->tty || !info->tty->termios)
- return;
-
- cflag = info->tty->termios->c_cflag;
- baud = tty_get_baud_rate(info->tty);
- if (baud == 0) {
- if (old_termios) {
- info->tty->termios->c_cflag &= ~CBAUD;
- info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
- cflag = info->tty->termios->c_cflag;
- baud = tty_get_baud_rate(info->tty);
- }
- else
- baud = info->zs_baud;
- }
- if (baud > 230400)
- baud = 230400;
- else if (baud == 0)
- baud = 38400;
-
- spin_lock_irqsave(&info->lock, flags);
- info->zs_baud = baud;
- info->clk_divisor = 16;
-
- BAUDBG(KERN_DEBUG "set speed to %d bds, ", baud);
-
- switch (baud) {
- case ZS_CLOCK/16: /* 230400 */
- info->curregs[4] = X16CLK;
- info->curregs[11] = 0;
- break;
- case ZS_CLOCK/32: /* 115200 */
- info->curregs[4] = X32CLK;
- info->curregs[11] = 0;
- break;
- default:
- info->curregs[4] = X16CLK;
- info->curregs[11] = TCBR | RCBR;
- brg = BPS_TO_BRG(baud, ZS_CLOCK/info->clk_divisor);
- info->curregs[12] = (brg & 255);
- info->curregs[13] = ((brg >> 8) & 255);
- info->curregs[14] = BRENABL;
- }
-
- /* byte size and parity */
- info->curregs[3] &= ~RxNBITS_MASK;
- info->curregs[5] &= ~TxNBITS_MASK;
- switch (cflag & CSIZE) {
- case CS5:
- info->curregs[3] |= Rx5;
- info->curregs[5] |= Tx5;
- BAUDBG("5 bits, ");
- bits = 7;
- break;
- case CS6:
- info->curregs[3] |= Rx6;
- info->curregs[5] |= Tx6;
- BAUDBG("6 bits, ");
- bits = 8;
- break;
- case CS7:
- info->curregs[3] |= Rx7;
- info->curregs[5] |= Tx7;
- BAUDBG("7 bits, ");
- bits = 9;
- break;
- case CS8:
- default: /* defaults to 8 bits */
- info->curregs[3] |= Rx8;
- info->curregs[5] |= Tx8;
- BAUDBG("8 bits, ");
- bits = 10;
- break;
- }
- info->pendregs[3] = info->curregs[3];
- info->pendregs[5] = info->curregs[5];
-
- info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
- if (cflag & CSTOPB) {
- info->curregs[4] |= SB2;
- bits++;
- BAUDBG("2 stop, ");
- } else {
- info->curregs[4] |= SB1;
- BAUDBG("1 stop, ");
- }
- if (cflag & PARENB) {
- bits++;
- info->curregs[4] |= PAR_ENA;
- BAUDBG("parity, ");
- }
- if (!(cflag & PARODD)) {
- info->curregs[4] |= PAR_EVEN;
- }
- info->pendregs[4] = info->curregs[4];
-
- if (!(cflag & CLOCAL)) {
- if (!(info->curregs[15] & DCDIE))
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
- info->curregs[15] |= DCDIE;
- } else
- info->curregs[15] &= ~DCDIE;
- if (cflag & CRTSCTS) {
- info->curregs[15] |= CTSIE;
- if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
- info->tx_stopped = 1;
- } else {
- info->curregs[15] &= ~CTSIE;
- info->tx_stopped = 0;
- }
- info->pendregs[15] = info->curregs[15];
-
- /* Calc timeout value. This is pretty broken with high baud rates with HZ=100.
- This code would love a larger HZ and a >1 fifo size, but this is not
- a priority. The resulting value must be >HZ/2
- */
- info->timeout = ((info->xmit_fifo_size*HZ*bits) / baud);
- info->timeout += HZ/50+1; /* Add .02 seconds of slop */
-
- BAUDBG("timeout=%d/%ds, base:%d\n", (int)info->timeout, (int)HZ,
- (int)info->baud_base);
-
- /* set the irda codec to the right rate */
- if (info->is_irda)
- irda_setup(info);
-
- /* Load up the new values */
- load_zsregs(info->zs_channel, info->curregs);
-
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_flush_chars(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- if (!(info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
- !info->xmit_buf))
- /* Enable transmitter */
- transmit_chars(info);
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_write(struct tty_struct * tty,
- const unsigned char *buf, int count)
-{
- int c, ret = 0;
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_write"))
- return 0;
-
- if (!tty || !info->xmit_buf || !tmp_buf)
- return 0;
-
- while (1) {
- spin_lock_irqsave(&info->lock, flags);
- c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- if (c <= 0) {
- spin_unlock_irqrestore(&info->lock, flags);
- break;
- }
- memcpy(info->xmit_buf + info->xmit_head, buf, c);
- info->xmit_head = ((info->xmit_head + c) &
- (SERIAL_XMIT_SIZE-1));
- info->xmit_cnt += c;
- spin_unlock_irqrestore(&info->lock, flags);
- buf += c;
- count -= c;
- ret += c;
- }
- spin_lock_irqsave(&info->lock, flags);
- if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
- && !info->tx_active)
- transmit_chars(info);
- spin_unlock_irqrestore(&info->lock, flags);
- return ret;
-}
-
-static int rs_write_room(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- int ret;
-
- if (serial_paranoia_check(info, tty->name, "rs_write_room"))
- return 0;
- ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- return ret;
-}
-
-static int rs_chars_in_buffer(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
- return 0;
- return info->xmit_cnt;
-}
-
-static void rs_flush_buffer(struct tty_struct *tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
- return;
- spin_lock_irqsave(&info->lock, flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- spin_unlock_irqrestore(&info->lock, flags);
- tty_wakeup(tty);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_throttle()
- *
- * This routine is called by the upper-layer tty layer to signal that
- * incoming characters should be throttled.
- * ------------------------------------------------------------
- */
-static void rs_throttle(struct tty_struct * tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
- printk(KERN_DEBUG "throttle %ld....\n",tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_throttle"))
- return;
-
- if (I_IXOFF(tty)) {
- spin_lock_irqsave(&info->lock, flags);
- info->x_char = STOP_CHAR(tty);
- if (!info->tx_active)
- transmit_chars(info);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- if (C_CRTSCTS(tty)) {
- /*
- * Here we want to turn off the RTS line. On Macintoshes,
- * the external serial ports using a DIN-8 or DIN-9
- * connector only have the DTR line (which is usually
- * wired to both RTS and DTR on an external modem in
- * the cable). RTS doesn't go out to the serial port
- * socket, it acts as an output enable for the transmit
- * data line. So in this case we don't drop RTS.
- *
- * Macs with internal modems generally do have both RTS
- * and DTR wired to the modem, so in that case we do
- * drop RTS.
- */
- if (info->is_internal_modem) {
- spin_lock_irqsave(&info->lock, flags);
- info->curregs[5] &= ~RTS;
- info->pendregs[5] &= ~RTS;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
- }
- }
-
-#ifdef CDTRCTS
- if (tty->termios->c_cflag & CDTRCTS) {
- spin_lock_irqsave(&info->lock, flags);
- info->curregs[5] &= ~DTR;
- info->pendregs[5] &= ~DTR;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-#endif /* CDTRCTS */
-}
-
-static void rs_unthrottle(struct tty_struct * tty)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
- printk(KERN_DEBUG "unthrottle %s: %d....\n",
- tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
- return;
-
- if (I_IXOFF(tty)) {
- spin_lock_irqsave(&info->lock, flags);
- if (info->x_char)
- info->x_char = 0;
- else {
- info->x_char = START_CHAR(tty);
- if (!info->tx_active)
- transmit_chars(info);
- }
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- if (C_CRTSCTS(tty) && info->is_internal_modem) {
- /* Assert RTS line */
- spin_lock_irqsave(&info->lock, flags);
- info->curregs[5] |= RTS;
- info->pendregs[5] |= RTS;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
-#ifdef CDTRCTS
- if (tty->termios->c_cflag & CDTRCTS) {
- /* Assert DTR line */
- spin_lock_irqsave(&info->lock, flags);
- info->curregs[5] |= DTR;
- info->pendregs[5] |= DTR;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-#endif
-}
-
-/*
- * ------------------------------------------------------------
- * rs_ioctl() and friends
- * ------------------------------------------------------------
- */
-
-static int get_serial_info(struct mac_serial * info,
- struct serial_struct __user * retinfo)
-{
- struct serial_struct tmp;
-
- if (!retinfo)
- return -EFAULT;
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = info->type;
- tmp.line = info->line;
- tmp.port = info->port;
- tmp.irq = info->irq;
- tmp.flags = info->flags;
- tmp.baud_base = info->baud_base;
- tmp.close_delay = info->close_delay;
- tmp.closing_wait = info->closing_wait;
- tmp.custom_divisor = info->custom_divisor;
- if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int set_serial_info(struct mac_serial * info,
- struct serial_struct __user * new_info)
-{
- struct serial_struct new_serial;
- struct mac_serial old_info;
- int retval = 0;
-
- 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 & ~ZILOG_USR_MASK) !=
- (info->flags & ~ZILOG_USR_MASK)))
- return -EPERM;
- info->flags = ((info->flags & ~ZILOG_USR_MASK) |
- (new_serial.flags & ZILOG_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 & ~ZILOG_FLAGS) |
- (new_serial.flags & ZILOG_FLAGS));
- info->type = new_serial.type;
- info->close_delay = new_serial.close_delay;
- info->closing_wait = new_serial.closing_wait;
-
-check_and_exit:
- if (info->flags & ZILOG_INITIALIZED)
- retval = setup_scc(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 mac_serial * info, unsigned int *value)
-{
- unsigned char status;
- unsigned long flags;
-
- spin_lock_irqsave(&info->lock, flags);
- status = read_zsreg(info->zs_channel, 0);
- spin_unlock_irqrestore(&info->lock, flags);
- status = (status & Tx_BUF_EMP)? TIOCSER_TEMT: 0;
- return put_user(status,value);
-}
-
-static int rs_tiocmget(struct tty_struct *tty, struct file *file)
-{
- struct mac_serial * info = (struct mac_serial *)tty->driver_data;
- unsigned char control, status;
- unsigned long flags;
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel)
- return -ENODEV;
-#endif
- if (serial_paranoia_check(info, tty->name, __FUNCTION__))
- return -ENODEV;
-
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
-
- spin_lock_irqsave(&info->lock, flags);
- control = info->curregs[5];
- status = read_zsreg(info->zs_channel, 0);
- spin_unlock_irqrestore(&info->lock, flags);
- return ((control & RTS) ? TIOCM_RTS: 0)
- | ((control & DTR) ? TIOCM_DTR: 0)
- | ((status & DCD) ? TIOCM_CAR: 0)
- | ((status & CTS) ? 0: TIOCM_CTS);
-}
-
-static int rs_tiocmset(struct tty_struct *tty, struct file *file,
- unsigned int set, unsigned int clear)
-{
- struct mac_serial * info = (struct mac_serial *)tty->driver_data;
- unsigned int arg, bits;
- unsigned long flags;
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel)
- return -ENODEV;
-#endif
- if (serial_paranoia_check(info, tty->name, __FUNCTION__))
- return -ENODEV;
-
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
-
- spin_lock_irqsave(&info->lock, flags);
- if (set & TIOCM_RTS)
- info->curregs[5] |= RTS;
- if (set & TIOCM_DTR)
- info->curregs[5] |= DTR;
- if (clear & TIOCM_RTS)
- info->curregs[5] &= ~RTS;
- if (clear & TIOCM_DTR)
- info->curregs[5] &= ~DTR;
-
- info->pendregs[5] = info->curregs[5];
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
- return 0;
-}
-
-/*
- * rs_break - turn transmit break condition on/off
- */
-static void rs_break(struct tty_struct *tty, int break_state)
-{
- struct mac_serial *info = (struct mac_serial *) tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_break"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- if (break_state == -1)
- info->curregs[5] |= SND_BRK;
- else
- info->curregs[5] &= ~SND_BRK;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
-{
- struct mac_serial * info = (struct mac_serial *)tty->driver_data;
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel)
- return -ENODEV;
-#endif
- if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
- return -ENODEV;
-
- if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
- (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT)) {
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
- }
-
- switch (cmd) {
- case TIOCGSERIAL:
- return get_serial_info(info,
- (struct serial_struct __user *) arg);
- case TIOCSSERIAL:
- return set_serial_info(info,
- (struct serial_struct __user *) arg);
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, (unsigned int *) arg);
-
- case TIOCSERGSTRUCT:
- if (copy_to_user((struct mac_serial __user *) arg,
- info, sizeof(struct mac_serial)))
- return -EFAULT;
- return 0;
-
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
-}
-
-static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
-{
- struct mac_serial *info = (struct mac_serial *)tty->driver_data;
- int was_stopped;
-
- if (tty->termios->c_cflag == old_termios->c_cflag)
- return;
- was_stopped = info->tx_stopped;
-
- change_speed(info, old_termios);
-
- if (was_stopped && !info->tx_stopped) {
- tty->hw_stopped = 0;
- rs_start(tty);
- }
-}
-
-/*
- * ------------------------------------------------------------
- * rs_close()
- *
- * This routine is called when the serial port gets closed.
- * Wait for the last remaining data to be sent.
- * ------------------------------------------------------------
- */
-static void rs_close(struct tty_struct *tty, struct file * filp)
-{
- struct mac_serial * info = (struct mac_serial *)tty->driver_data;
- unsigned long flags;
-
- if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&info->lock, flags);
- return;
- }
-
- OPNDBG("rs_close ttyS%d, count = %d\n", info->line, info->count);
- 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(KERN_ERR "rs_close: bad serial port count; tty->count "
- "is 1, info->count is %d\n", info->count);
- info->count = 1;
- }
- if (--info->count < 0) {
- printk(KERN_ERR "rs_close: bad serial port count for "
- "ttyS%d: %d\n", info->line, info->count);
- info->count = 0;
- }
- if (info->count) {
- spin_unlock_irqrestore(&info->lock, flags);
- return;
- }
- info->flags |= ZILOG_CLOSING;
- /*
- * Now we wait for the transmit buffer to clear; and we notify
- * the line discipline to only process XON/XOFF characters.
- */
- OPNDBG("waiting end of Tx... (timeout:%d)\n", info->closing_wait);
- tty->closing = 1;
- if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) {
- spin_unlock_irqrestore(&info->lock, flags);
- tty_wait_until_sent(tty, info->closing_wait);
- spin_lock_irqsave(&info->lock, flags);
- }
-
- /*
- * At this point we stop accepting input. To do this, we
- * disable the receiver and receive interrupts.
- */
- info->curregs[3] &= ~RxENABLE;
- info->pendregs[3] = info->curregs[3];
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- info->curregs[1] &= ~(0x18); /* disable any rx ints */
- info->pendregs[1] = info->curregs[1];
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- ZS_CLEARFIFO(info->zs_channel);
- if (info->flags & ZILOG_INITIALIZED) {
- /*
- * Before we drop DTR, make sure the SCC transmitter
- * has completely drained.
- */
- OPNDBG("waiting end of Rx...\n");
- spin_unlock_irqrestore(&info->lock, flags);
- rs_wait_until_sent(tty, info->timeout);
- spin_lock_irqsave(&info->lock, flags);
- }
-
- shutdown(info);
- /* restore flags now since shutdown() will have disabled this port's
- specific irqs */
- spin_unlock_irqrestore(&info->lock, flags);
-
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
- tty_ldisc_flush(tty);
- tty->closing = 0;
- info->event = 0;
- info->tty = 0;
-
- if (info->blocked_open) {
- if (info->close_delay) {
- msleep_interruptible(jiffies_to_msecs(info->close_delay));
- }
- wake_up_interruptible(&info->open_wait);
- }
- info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING);
- wake_up_interruptible(&info->close_wait);
-}
-
-/*
- * rs_wait_until_sent() --- wait until the transmitter is empty
- */
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- struct mac_serial *info = (struct mac_serial *) tty->driver_data;
- unsigned long orig_jiffies, char_time;
-
- if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
- return;
-
-/* printk("rs_wait_until_sent, timeout:%d, tty_stopped:%d, tx_stopped:%d\n",
- timeout, tty->stopped, info->tx_stopped);
-*/
- 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.
- */
- if (info->timeout <= HZ/50) {
- printk(KERN_INFO "macserial: invalid info->timeout=%d\n",
- info->timeout);
- info->timeout = HZ/50+1;
- }
-
- char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
- char_time = char_time / 5;
- if (char_time > HZ) {
- printk(KERN_WARNING "macserial: char_time %ld >HZ !!!\n",
- char_time);
- char_time = 1;
- } else if (char_time == 0)
- char_time = 1;
- if (timeout)
- char_time = min_t(unsigned long, char_time, timeout);
- while ((read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
- msleep_interruptible(jiffies_to_msecs(char_time));
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- break;
- }
- current->state = TASK_RUNNING;
-}
-
-/*
- * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
-static void rs_hangup(struct tty_struct *tty)
-{
- struct mac_serial * info = (struct mac_serial *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->name, "rs_hangup"))
- return;
-
- rs_flush_buffer(tty);
- shutdown(info);
- info->event = 0;
- info->count = 0;
- info->flags &= ~ZILOG_NORMAL_ACTIVE;
- info->tty = 0;
- wake_up_interruptible(&info->open_wait);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_open() and friends
- * ------------------------------------------------------------
- */
-static int block_til_ready(struct tty_struct *tty, struct file * filp,
- struct mac_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 & ZILOG_CLOSING) {
- interruptible_sleep_on(&info->close_wait);
- return -EAGAIN;
- }
-
- /*
- * 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 |= ZILOG_NORMAL_ACTIVE;
- return 0;
- }
-
- if (tty->termios->c_cflag & CLOCAL)
- do_clocal = 1;
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, info->count is dropped by one, so that
- * rs_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&info->open_wait, &wait);
- OPNDBG("block_til_ready before block: ttyS%d, count = %d\n",
- info->line, info->count);
- spin_lock_irq(&info->lock);
- if (!tty_hung_up_p(filp))
- info->count--;
- spin_unlock_irq(&info->lock);
- info->blocked_open++;
- while (1) {
- spin_lock_irq(&info->lock);
- if ((tty->termios->c_cflag & CBAUD) &&
- !info->is_irda)
- zs_rtsdtr(info, 1);
- spin_unlock_irq(&info->lock);
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(info->flags & ZILOG_INITIALIZED)) {
- retval = -EAGAIN;
- break;
- }
- if (!(info->flags & ZILOG_CLOSING) &&
- (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- OPNDBG("block_til_ready blocking: ttyS%d, count = %d\n",
- info->line, info->count);
- schedule();
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&info->open_wait, &wait);
- if (!tty_hung_up_p(filp))
- info->count++;
- info->blocked_open--;
- OPNDBG("block_til_ready after blocking: ttyS%d, count = %d\n",
- info->line, info->count);
- if (retval)
- return retval;
- info->flags |= ZILOG_NORMAL_ACTIVE;
- return 0;
-}
-
-/*
- * This routine is called whenever a serial port is opened. It
- * enables interrupts for a serial port, linking in its ZILOG 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 mac_serial *info;
- int retval, line;
- unsigned long page;
-
- line = tty->index;
- if ((line < 0) || (line >= zs_channels_found)) {
- return -ENODEV;
- }
- info = zs_soft + line;
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel) {
- return -ENODEV;
- }
-#endif
- if (serial_paranoia_check(info, tty->name, "rs_open"))
- return -ENODEV;
- OPNDBG("rs_open %s, count = %d, tty=%p\n", tty->name,
- info->count, tty);
-
- info->count++;
- tty->driver_data = info;
- info->tty = tty;
-
- if (!tmp_buf) {
- page = get_zeroed_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
- if (tmp_buf)
- free_page(page);
- else
- tmp_buf = (unsigned char *) page;
- }
-
- /*
- * If the port is the middle of closing, bail out now
- */
- if (tty_hung_up_p(filp) ||
- (info->flags & ZILOG_CLOSING)) {
- if (info->flags & ZILOG_CLOSING)
- interruptible_sleep_on(&info->close_wait);
- return -EAGAIN;
- }
-
- /*
- * Start up serial port
- */
-
- retval = startup(info);
- if (retval)
- return retval;
-
- retval = block_til_ready(tty, filp, info);
- if (retval) {
- OPNDBG("rs_open returning after block_til_ready with %d\n",
- retval);
- return retval;
- }
-
-#ifdef CONFIG_SERIAL_CONSOLE
- if (sercons.cflag && sercons.index == line) {
- tty->termios->c_cflag = sercons.cflag;
- sercons.cflag = 0;
- change_speed(info, 0);
- }
-#endif
-
- OPNDBG("rs_open %s successful...\n", tty->name);
- return 0;
-}
-
-/* Finally, routines used to initialize the serial driver. */
-
-static void show_serial_version(void)
-{
- printk(KERN_INFO "PowerMac Z8530 serial driver version " MACSERIAL_VERSION "\n");
-}
-
-/*
- * Initialize one channel, both the mac_serial and mac_zschannel
- * structs. We use the dev_node field of the mac_serial struct.
- */
-static int
-chan_init(struct mac_serial *zss, struct mac_zschannel *zs_chan,
- struct mac_zschannel *zs_chan_a)
-{
- struct device_node *ch = zss->dev_node;
- char *conn;
- int len;
- struct slot_names_prop {
- int count;
- char name[1];
- } *slots;
-
- zss->irq = ch->intrs[0].line;
- zss->has_dma = 0;
-#if !defined(CONFIG_KGDB) && defined(SUPPORT_SERIAL_DMA)
- if (ch->n_addrs >= 3 && ch->n_intrs == 3)
- zss->has_dma = 1;
-#endif
- zss->dma_initted = 0;
-
- zs_chan->control = (volatile unsigned char *)
- ioremap(ch->addrs[0].address, 0x1000);
- zs_chan->data = zs_chan->control + 0x10;
- spin_lock_init(&zs_chan->lock);
- zs_chan->parent = zss;
- zss->zs_channel = zs_chan;
- zss->zs_chan_a = zs_chan_a;
-
- /* setup misc varariables */
- zss->kgdb_channel = 0;
-
- /* For now, we assume you either have a slot-names property
- * with "Modem" in it, or your channel is compatible with
- * "cobalt". Might need additional fixups
- */
- zss->is_internal_modem = device_is_compatible(ch, "cobalt");
- conn = get_property(ch, "AAPL,connector", &len);
- zss->is_irda = conn && (strcmp(conn, "infrared") == 0);
- zss->port_type = PMAC_SCC_ASYNC;
- /* 1999 Powerbook G3 has slot-names property instead */
- slots = (struct slot_names_prop *)get_property(ch, "slot-names", &len);
- if (slots && slots->count > 0) {
- if (strcmp(slots->name, "IrDA") == 0)
- zss->is_irda = 1;
- else if (strcmp(slots->name, "Modem") == 0)
- zss->is_internal_modem = 1;
- }
- if (zss->is_irda)
- zss->port_type = PMAC_SCC_IRDA;
- if (zss->is_internal_modem) {
- struct device_node* i2c_modem = find_devices("i2c-modem");
- if (i2c_modem) {
- char* mid = get_property(i2c_modem, "modem-id", NULL);
- if (mid) switch(*mid) {
- case 0x04 :
- case 0x05 :
- case 0x07 :
- case 0x08 :
- case 0x0b :
- case 0x0c :
- zss->port_type = PMAC_SCC_I2S1;
- }
- printk(KERN_INFO "macserial: i2c-modem detected, id: %d\n",
- mid ? (*mid) : 0);
- } else {
- printk(KERN_INFO "macserial: serial modem detected\n");
- }
- }
-
- while (zss->has_dma) {
- zss->dma_priv = NULL;
- /* it seems that the last two addresses are the
- DMA controllers */
- zss->tx_dma = (volatile struct dbdma_regs *)
- ioremap(ch->addrs[ch->n_addrs - 2].address, 0x100);
- zss->rx = (volatile struct mac_dma *)
- ioremap(ch->addrs[ch->n_addrs - 1].address, 0x100);
- zss->tx_dma_irq = ch->intrs[1].line;
- zss->rx_dma_irq = ch->intrs[2].line;
- spin_lock_init(&zss->rx_dma_lock);
- break;
- }
-
- init_timer(&zss->powerup_timer);
- zss->powerup_timer.function = powerup_done;
- zss->powerup_timer.data = (unsigned long) zss;
- return 0;
-}
-
-/*
- * /proc fs routines. TODO: Add status lines & error stats
- */
-static inline int
-line_info(char *buf, struct mac_serial *info)
-{
- int ret=0;
- unsigned char* connector;
- int lenp;
-
- ret += sprintf(buf, "%d: port:0x%X irq:%d", info->line, info->port, info->irq);
-
- connector = get_property(info->dev_node, "AAPL,connector", &lenp);
- if (connector)
- ret+=sprintf(buf+ret," con:%s ", connector);
- if (info->is_internal_modem) {
- if (!connector)
- ret+=sprintf(buf+ret," con:");
- ret+=sprintf(buf+ret,"%s", " (internal modem)");
- }
- if (info->is_irda) {
- if (!connector)
- ret+=sprintf(buf+ret," con:");
- ret+=sprintf(buf+ret,"%s", " (IrDA)");
- }
- ret+=sprintf(buf+ret,"\n");
-
- return ret;
-}
-
-int macserial_read_proc(char *page, char **start, off_t off, int count,
- int *eof, void *data)
-{
- int l, len = 0;
- off_t begin = 0;
- struct mac_serial *info;
-
- len += sprintf(page, "serinfo:1.0 driver:" MACSERIAL_VERSION "\n");
- for (info = zs_chain; info && len < 4000; info = info->zs_next) {
- l = line_info(page + len, info);
- len += l;
- if (len+begin > off+count)
- goto done;
- if (len+begin < off) {
- begin += len;
- len = 0;
- }
- }
- *eof = 1;
-done:
- if (off >= len+begin)
- return 0;
- *start = page + (off-begin);
- return ((count < begin+len-off) ? count : begin+len-off);
-}
-
-/* Ask the PROM how many Z8530s we have and initialize their zs_channels */
-static void
-probe_sccs(void)
-{
- struct device_node *dev, *ch;
- struct mac_serial **pp;
- int n, chip, nchan;
- struct mac_zschannel *zs_chan;
- int chan_a_index;
-
- n = 0;
- pp = &zs_chain;
- zs_chan = zs_channels;
- for (dev = find_devices("escc"); dev != 0; dev = dev->next) {
- nchan = 0;
- chip = n;
- if (n >= NUM_CHANNELS) {
- printk(KERN_WARNING "Sorry, can't use %s: no more "
- "channels\n", dev->full_name);
- continue;
- }
- chan_a_index = 0;
- for (ch = dev->child; ch != 0; ch = ch->sibling) {
- if (nchan >= 2) {
- printk(KERN_WARNING "SCC: Only 2 channels per "
- "chip are supported\n");
- break;
- }
- if (ch->n_addrs < 1 || (ch ->n_intrs < 1)) {
- printk("Can't use %s: %d addrs %d intrs\n",
- ch->full_name, ch->n_addrs, ch->n_intrs);
- continue;
- }
-
- /* The channel with the higher address
- will be the A side. */
- if (nchan > 0 &&
- ch->addrs[0].address
- > zs_soft[n-1].dev_node->addrs[0].address)
- chan_a_index = 1;
-
- /* minimal initialization for now */
- zs_soft[n].dev_node = ch;
- *pp = &zs_soft[n];
- pp = &zs_soft[n].zs_next;
- ++nchan;
- ++n;
- }
- if (nchan == 0)
- continue;
-
- /* set up A side */
- if (chan_init(&zs_soft[chip + chan_a_index], zs_chan, zs_chan))
- continue;
- ++zs_chan;
-
- /* set up B side, if it exists */
- if (nchan > 1)
- if (chan_init(&zs_soft[chip + 1 - chan_a_index],
- zs_chan, zs_chan - 1))
- continue;
- ++zs_chan;
- }
- *pp = 0;
-
- zs_channels_found = n;
-#ifdef CONFIG_PMAC_PBOOK
- if (n)
- pmu_register_sleep_notifier(&serial_sleep_notifier);
-#endif /* CONFIG_PMAC_PBOOK */
-}
-
-static struct tty_operations serial_ops = {
- .open = rs_open,
- .close = rs_close,
- .write = rs_write,
- .flush_chars = rs_flush_chars,
- .write_room = rs_write_room,
- .chars_in_buffer = rs_chars_in_buffer,
- .flush_buffer = rs_flush_buffer,
- .ioctl = rs_ioctl,
- .throttle = rs_throttle,
- .unthrottle = rs_unthrottle,
- .set_termios = rs_set_termios,
- .stop = rs_stop,
- .start = rs_start,
- .hangup = rs_hangup,
- .break_ctl = rs_break,
- .wait_until_sent = rs_wait_until_sent,
- .read_proc = macserial_read_proc,
- .tiocmget = rs_tiocmget,
- .tiocmset = rs_tiocmset,
-};
-
-static int macserial_init(void)
-{
- int channel, i;
- struct mac_serial *info;
-
- /* Find out how many Z8530 SCCs we have */
- if (zs_chain == 0)
- probe_sccs();
-
- serial_driver = alloc_tty_driver(zs_channels_found);
- if (!serial_driver)
- return -ENOMEM;
-
- /* XXX assume it's a powerbook if we have a via-pmu
- *
- * This is OK for core99 machines as well.
- */
- is_powerbook = find_devices("via-pmu") != 0;
-
- /* Register the interrupt handler for each one
- * We also request the OF resources here as probe_sccs()
- * might be called too early for that
- */
- for (i = 0; i < zs_channels_found; ++i) {
- struct device_node* ch = zs_soft[i].dev_node;
- if (!request_OF_resource(ch, 0, NULL)) {
- printk(KERN_ERR "macserial: can't request IO resource !\n");
- put_tty_driver(serial_driver);
- return -ENODEV;
- }
- if (zs_soft[i].has_dma) {
- if (!request_OF_resource(ch, ch->n_addrs - 2, " (tx dma)")) {
- printk(KERN_ERR "macserial: can't request TX DMA resource !\n");
- zs_soft[i].has_dma = 0;
- goto no_dma;
- }
- if (!request_OF_resource(ch, ch->n_addrs - 1, " (rx dma)")) {
- release_OF_resource(ch, ch->n_addrs - 2);
- printk(KERN_ERR "macserial: can't request RX DMA resource !\n");
- zs_soft[i].has_dma = 0;
- goto no_dma;
- }
- if (request_irq(zs_soft[i].tx_dma_irq, rs_txdma_irq, 0,
- "SCC-txdma", &zs_soft[i]))
- printk(KERN_ERR "macserial: can't get irq %d\n",
- zs_soft[i].tx_dma_irq);
- disable_irq(zs_soft[i].tx_dma_irq);
- if (request_irq(zs_soft[i].rx_dma_irq, rs_rxdma_irq, 0,
- "SCC-rxdma", &zs_soft[i]))
- printk(KERN_ERR "macserial: can't get irq %d\n",
- zs_soft[i].rx_dma_irq);
- disable_irq(zs_soft[i].rx_dma_irq);
- }
-no_dma:
- if (request_irq(zs_soft[i].irq, rs_interrupt, 0,
- "SCC", &zs_soft[i]))
- printk(KERN_ERR "macserial: can't get irq %d\n",
- zs_soft[i].irq);
- disable_irq(zs_soft[i].irq);
- }
-
- show_serial_version();
-
- /* Initialize the tty_driver structure */
- /* Not all of this is exactly right for us. */
-
- serial_driver->owner = THIS_MODULE;
- serial_driver->driver_name = "macserial";
- serial_driver->devfs_name = "tts/";
- 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 =
- B38400 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver->flags = TTY_DRIVER_REAL_RAW;
- tty_set_operations(serial_driver, &serial_ops);
-
- if (tty_register_driver(serial_driver))
- printk(KERN_ERR "Error: couldn't register serial driver\n");
-
- for (channel = 0; channel < zs_channels_found; ++channel) {
-#ifdef CONFIG_KGDB
- if (zs_soft[channel].kgdb_channel) {
- kgdb_interruptible(1);
- continue;
- }
-#endif
- zs_soft[channel].clk_divisor = 16;
-/* -- we are not sure the SCC is powered ON at this point
- zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
-*/
- zs_soft[channel].zs_baud = 38400;
-
- /* If console serial line, then enable interrupts. */
- if (zs_soft[channel].is_cons) {
- printk(KERN_INFO "macserial: console line, enabling "
- "interrupt %d\n", zs_soft[channel].irq);
- panic("macserial: console not supported yet !");
- write_zsreg(zs_soft[channel].zs_channel, R1,
- (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB));
- write_zsreg(zs_soft[channel].zs_channel, R9,
- (NV | MIE));
- }
- }
-
- for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
- {
- unsigned char* connector;
- int lenp;
-
-#ifdef CONFIG_KGDB
- if (info->kgdb_channel) {
- continue;
- }
-#endif
- info->magic = SERIAL_MAGIC;
- info->port = (int) info->zs_channel->control;
- info->line = i;
- info->tty = 0;
- info->custom_divisor = 16;
- info->timeout = 0;
- 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, do_softint, info);
- spin_lock_init(&info->lock);
- init_waitqueue_head(&info->open_wait);
- init_waitqueue_head(&info->close_wait);
- info->timeout = HZ;
- printk(KERN_INFO "tty%02d at 0x%08x (irq = %d)", info->line,
- info->port, info->irq);
- printk(" is a Z8530 ESCC");
- connector = get_property(info->dev_node, "AAPL,connector", &lenp);
- if (connector)
- printk(", port = %s", connector);
- if (info->is_internal_modem)
- printk(" (internal modem)");
- if (info->is_irda)
- printk(" (IrDA)");
- printk("\n");
- }
- tmp_buf = 0;
-
- return 0;
-}
-
-void macserial_cleanup(void)
-{
- int i;
- unsigned long flags;
- struct mac_serial *info;
-
- for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
- set_scc_power(info, 0);
- spin_lock_irqsave(&info->lock, flags);
- for (i = 0; i < zs_channels_found; ++i) {
- free_irq(zs_soft[i].irq, &zs_soft[i]);
- if (zs_soft[i].has_dma) {
- free_irq(zs_soft[i].tx_dma_irq, &zs_soft[i]);
- free_irq(zs_soft[i].rx_dma_irq, &zs_soft[i]);
- }
- release_OF_resource(zs_soft[i].dev_node, 0);
- if (zs_soft[i].has_dma) {
- struct device_node* ch = zs_soft[i].dev_node;
- release_OF_resource(ch, ch->n_addrs - 2);
- release_OF_resource(ch, ch->n_addrs - 1);
- }
- }
- spin_unlock_irqrestore(&info->lock, flags);
- tty_unregister_driver(serial_driver);
- put_tty_driver(serial_driver);
-
- if (tmp_buf) {
- free_page((unsigned long) tmp_buf);
- tmp_buf = 0;
- }
-
-#ifdef CONFIG_PMAC_PBOOK
- if (zs_channels_found)
- pmu_unregister_sleep_notifier(&serial_sleep_notifier);
-#endif /* CONFIG_PMAC_PBOOK */
-}
-
-module_init(macserial_init);
-module_exit(macserial_cleanup);
-MODULE_LICENSE("GPL");
-
-#if 0
-/*
- * register_serial and unregister_serial allows for serial ports to be
- * configured at run-time, to support PCMCIA modems.
- */
-/* PowerMac: Unused at this time, just here to make things link. */
-int register_serial(struct serial_struct *req)
-{
- return -1;
-}
-
-void unregister_serial(int line)
-{
- return;
-}
-#endif
-
-/*
- * ------------------------------------------------------------
- * Serial console driver
- * ------------------------------------------------------------
- */
-#ifdef CONFIG_SERIAL_CONSOLE
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- */
-static void serial_console_write(struct console *co, const char *s,
- unsigned count)
-{
- struct mac_serial *info = zs_soft + co->index;
- int i;
-
- /* Turn of interrupts and enable the transmitter. */
- write_zsreg(info->zs_channel, R1, info->curregs[1] & ~TxINT_ENAB);
- write_zsreg(info->zs_channel, R5, info->curregs[5] | TxENAB | RTS | DTR);
-
- for (i=0; i<count; i++) {
- /* Wait for the transmit buffer to empty. */
- while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) {
- eieio();
- }
-
- write_zsdata(info->zs_channel, s[i]);
- if (s[i] == 10) {
- while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP)
- == 0)
- eieio();
-
- write_zsdata(info->zs_channel, 13);
- }
- }
-
- /* Restore the values in the registers. */
- write_zsreg(info->zs_channel, R1, info->curregs[1]);
- /* Don't disable the transmitter. */
-}
-
-static struct tty_driver *serial_driver;
-
-static struct tty_driver *serial_console_device(struct console *c, int *index)
-{
- *index = c->index;
- return serial_driver;
-}
-
-/*
- * Setup initial baud/bits/parity. We do two things here:
- * - construct a cflag setting for the first rs_open()
- * - initialize the serial port
- * Return non-zero if we didn't find a serial port.
- */
-static int __init serial_console_setup(struct console *co, char *options)
-{
- struct mac_serial *info;
- int baud = 38400;
- int bits = 8;
- int parity = 'n';
- int cflag = CREAD | HUPCL | CLOCAL;
- int brg;
- char *s;
- long flags;
-
- /* Find out how many Z8530 SCCs we have */
- if (zs_chain == 0)
- probe_sccs();
-
- if (zs_chain == 0)
- return -1;
-
- /* Do we have the device asked for? */
- if (co->index >= zs_channels_found)
- return -1;
- info = zs_soft + co->index;
-
- set_scc_power(info, 1);
-
- /* Reset the channel */
- write_zsreg(info->zs_channel, R9, CHRA);
-
- if (options) {
- baud = simple_strtoul(options, NULL, 10);
- s = options;
- while(*s >= '0' && *s <= '9')
- s++;
- if (*s)
- parity = *s++;
- if (*s)
- bits = *s - '0';
- }
-
- /*
- * Now construct a cflag setting.
- */
- switch(baud) {
- case 1200:
- cflag |= B1200;
- break;
- case 2400:
- cflag |= B2400;
- break;
- case 4800:
- cflag |= B4800;
- break;
- case 9600:
- cflag |= B9600;
- break;
- case 19200:
- cflag |= B19200;
- break;
- case 57600:
- cflag |= B57600;
- break;
- case 115200:
- cflag |= B115200;
- break;
- case 38400:
- default:
- cflag |= B38400;
- break;
- }
- switch(bits) {
- case 7:
- cflag |= CS7;
- break;
- default:
- case 8:
- cflag |= CS8;
- break;
- }
- switch(parity) {
- case 'o': case 'O':
- cflag |= PARENB | PARODD;
- break;
- case 'e': case 'E':
- cflag |= PARENB;
- break;
- }
- co->cflag = cflag;
-
- spin_lock_irqsave(&info->lock, flags);
- memset(info->curregs, 0, sizeof(info->curregs));
-
- info->zs_baud = baud;
- info->clk_divisor = 16;
- switch (info->zs_baud) {
- case ZS_CLOCK/16: /* 230400 */
- info->curregs[4] = X16CLK;
- info->curregs[11] = 0;
- break;
- case ZS_CLOCK/32: /* 115200 */
- info->curregs[4] = X32CLK;
- info->curregs[11] = 0;
- break;
- default:
- info->curregs[4] = X16CLK;
- info->curregs[11] = TCBR | RCBR;
- brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
- info->curregs[12] = (brg & 255);
- info->curregs[13] = ((brg >> 8) & 255);
- info->curregs[14] = BRENABL;
- }
-
- /* byte size and parity */
- info->curregs[3] &= ~RxNBITS_MASK;
- info->curregs[5] &= ~TxNBITS_MASK;
- switch (cflag & CSIZE) {
- case CS5:
- info->curregs[3] |= Rx5;
- info->curregs[5] |= Tx5;
- break;
- case CS6:
- info->curregs[3] |= Rx6;
- info->curregs[5] |= Tx6;
- break;
- case CS7:
- info->curregs[3] |= Rx7;
- info->curregs[5] |= Tx7;
- break;
- case CS8:
- default: /* defaults to 8 bits */
- info->curregs[3] |= Rx8;
- info->curregs[5] |= Tx8;
- break;
- }
- info->curregs[5] |= TxENAB | RTS | DTR;
- info->pendregs[3] = info->curregs[3];
- info->pendregs[5] = info->curregs[5];
-
- info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
- if (cflag & CSTOPB) {
- info->curregs[4] |= SB2;
- } else {
- info->curregs[4] |= SB1;
- }
- if (cflag & PARENB) {
- info->curregs[4] |= PAR_ENA;
- if (!(cflag & PARODD)) {
- info->curregs[4] |= PAR_EVEN;
- }
- }
- info->pendregs[4] = info->curregs[4];
-
- if (!(cflag & CLOCAL)) {
- if (!(info->curregs[15] & DCDIE))
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
- info->curregs[15] |= DCDIE;
- } else
- info->curregs[15] &= ~DCDIE;
- if (cflag & CRTSCTS) {
- info->curregs[15] |= CTSIE;
- if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
- info->tx_stopped = 1;
- } else {
- info->curregs[15] &= ~CTSIE;
- info->tx_stopped = 0;
- }
- info->pendregs[15] = info->curregs[15];
-
- /* Load up the new values */
- load_zsregs(info->zs_channel, info->curregs);
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- return 0;
-}
-
-static struct console sercons = {
- .name = "ttyS",
- .write = serial_console_write,
- .device = serial_console_device,
- .setup = serial_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
-};
-
-/*
- * Register console.
- */
-static void __init mac_scc_console_init(void)
-{
- register_console(&sercons);
-}
-console_initcall(mac_scc_console_init);
-
-#endif /* ifdef CONFIG_SERIAL_CONSOLE */
-
-#ifdef CONFIG_KGDB
-/* These are for receiving and sending characters under the kgdb
- * source level kernel debugger.
- */
-void putDebugChar(char kgdb_char)
-{
- struct mac_zschannel *chan = zs_kgdbchan;
- while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
- udelay(5);
- write_zsdata(chan, kgdb_char);
-}
-
-char getDebugChar(void)
-{
- struct mac_zschannel *chan = zs_kgdbchan;
- while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
- eieio(); /*barrier();*/
- return read_zsdata(chan);
-}
-
-void kgdb_interruptible(int yes)
-{
- struct mac_zschannel *chan = zs_kgdbchan;
- int one, nine;
- nine = read_zsreg(chan, 9);
- if (yes == 1) {
- one = EXT_INT_ENAB|INT_ALL_Rx;
- nine |= MIE;
- printk("turning serial ints on\n");
- } else {
- one = RxINT_DISAB;
- nine &= ~MIE;
- printk("turning serial ints off\n");
- }
- write_zsreg(chan, 1, one);
- write_zsreg(chan, 9, nine);
-}
-
-/* This sets up the serial port we're using, and turns on
- * interrupts for that channel, so kgdb is usable once we're done.
- */
-static inline void kgdb_chaninit(struct mac_zschannel *ms, int intson, int bps)
-{
- int brg;
- int i, x;
- volatile char *sccc = ms->control;
- brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
- printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg);
- for (i = 20000; i != 0; --i) {
- x = *sccc; eieio();
- }
- for (i = 0; i < sizeof(scc_inittab); ++i) {
- write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
- i++;
- }
-}
-
-/* This is called at boot time to prime the kgdb serial debugging
- * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
- * for /dev/ttyb which is determined in setup_arch() from the
- * boot command line flags.
- * XXX at the moment probably only channel A will work
- */
-void __init zs_kgdb_hook(int tty_num)
-{
- /* Find out how many Z8530 SCCs we have */
- if (zs_chain == 0)
- probe_sccs();
-
- set_scc_power(&zs_soft[tty_num], 1);
-
- zs_kgdbchan = zs_soft[tty_num].zs_channel;
- zs_soft[tty_num].change_needed = 0;
- zs_soft[tty_num].clk_divisor = 16;
- zs_soft[tty_num].zs_baud = 38400;
- zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */
-
- /* Turn on transmitter/receiver at 8-bits/char */
- kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
- printk("KGDB: on channel %d initialized\n", tty_num);
- set_debug_traps(); /* init stub */
-}
-#endif /* ifdef CONFIG_KGDB */
-
-#ifdef CONFIG_PMAC_PBOOK
-/*
- * notify clients before sleep and reset bus afterwards
- */
-int
-serial_notify_sleep(struct pmu_sleep_notifier *self, int when)
-{
- int i;
-
- switch (when) {
- case PBOOK_SLEEP_REQUEST:
- case PBOOK_SLEEP_REJECT:
- break;
-
- case PBOOK_SLEEP_NOW:
- for (i=0; i<zs_channels_found; i++) {
- struct mac_serial *info = &zs_soft[i];
- if (info->flags & ZILOG_INITIALIZED) {
- shutdown(info);
- info->flags |= ZILOG_SLEEPING;
- }
- }
- break;
- case PBOOK_WAKE:
- for (i=0; i<zs_channels_found; i++) {
- struct mac_serial *info = &zs_soft[i];
- if (info->flags & ZILOG_SLEEPING) {
- info->flags &= ~ZILOG_SLEEPING;
- startup(info);
- }
- }
- break;
- }
- return PBOOK_SLEEP_OK;
-}
-#endif /* CONFIG_PMAC_PBOOK */
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff