Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/macintosh/macserial.c b/drivers/macintosh/macserial.c
new file mode 100644
index 0000000..0be3ac6
--- /dev/null
+++ b/drivers/macintosh/macserial.c
@@ -0,0 +1,3036 @@
+/*
+ * 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 */