Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
new file mode 100644
index 0000000..0a6b9f0
--- /dev/null
+++ b/drivers/serial/pmac_zilog.c
@@ -0,0 +1,2048 @@
+/*
+ * linux/drivers/serial/pmac_zilog.c
+ *
+ * Driver for PowerMac Z85c30 based ESCC cell found in the
+ * "macio" ASICs of various PowerMac models
+ *
+ * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
+ *
+ * Derived from drivers/macintosh/macserial.c by Paul Mackerras
+ * and drivers/serial/sunzilog.c by David S. Miller
+ *
+ * Hrm... actually, I ripped most of sunzilog (Thanks David !) and
+ * adapted special tweaks needed for us. I don't think it's worth
+ * merging back those though. The DMA code still has to get in
+ * and once done, I expect that driver to remain fairly stable in
+ * the long term, unless we change the driver model again...
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * 2004-08-06 Harald Welte <laforge@gnumonks.org>
+ * - Enable BREAK interrupt
+ * - Add support for sysreq
+ *
+ * TODO: - Add DMA support
+ * - Defer port shutdown to a few seconds after close
+ * - maybe put something right into uap->clk_divisor
+ */
+
+#undef DEBUG
+#undef DEBUG_HARD
+#undef USE_CTRL_O_SYSRQ
+
+#include <linux/config.h>
+#include <linux/module.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>
+#include <linux/console.h>
+#include <linux/slab.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/bitops.h>
+#include <linux/sysrq.h>
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/dbdma.h>
+#include <asm/macio.h>
+#include <asm/semaphore.h>
+
+#if defined (CONFIG_SERIAL_PMACZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+
+#include "pmac_zilog.h"
+
+/* Not yet implemented */
+#undef HAS_DBDMA
+
+static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Driver for the PowerMac serial ports.");
+MODULE_LICENSE("GPL");
+
+#define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
+
+
+/*
+ * For the sake of early serial console, we can do a pre-probe
+ * (optional) of the ports at rather early boot time.
+ */
+static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS];
+static int pmz_ports_count;
+static DECLARE_MUTEX(pmz_irq_sem);
+
+static struct uart_driver pmz_uart_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = "ttyS",
+ .devfs_name = "tts/",
+ .dev_name = "ttyS",
+ .major = TTY_MAJOR,
+};
+
+
+/*
+ * Load all registers to reprogram the port
+ * This function must only be called when the TX is not busy. The UART
+ * port lock must be held and local interrupts disabled.
+ */
+static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
+{
+ int i;
+
+ if (ZS_IS_ASLEEP(uap))
+ return;
+
+ /* Let pending transmits finish. */
+ for (i = 0; i < 1000; i++) {
+ unsigned char stat = read_zsreg(uap, R1);
+ if (stat & ALL_SNT)
+ break;
+ udelay(100);
+ }
+
+ ZS_CLEARERR(uap);
+ zssync(uap);
+ ZS_CLEARFIFO(uap);
+ zssync(uap);
+ ZS_CLEARERR(uap);
+
+ /* Disable all interrupts. */
+ write_zsreg(uap, R1,
+ regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
+
+ /* Set parity, sync config, stop bits, and clock divisor. */
+ write_zsreg(uap, R4, regs[R4]);
+
+ /* Set misc. TX/RX control bits. */
+ write_zsreg(uap, R10, regs[R10]);
+
+ /* Set TX/RX controls sans the enable bits. */
+ write_zsreg(uap, R3, regs[R3] & ~RxENABLE);
+ write_zsreg(uap, R5, regs[R5] & ~TxENABLE);
+
+ /* now set R7 "prime" on ESCC */
+ write_zsreg(uap, R15, regs[R15] | EN85C30);
+ write_zsreg(uap, R7, regs[R7P]);
+
+ /* make sure we use R7 "non-prime" on ESCC */
+ write_zsreg(uap, R15, regs[R15] & ~EN85C30);
+
+ /* Synchronous mode config. */
+ write_zsreg(uap, R6, regs[R6]);
+ write_zsreg(uap, R7, regs[R7]);
+
+ /* Disable baud generator. */
+ write_zsreg(uap, R14, regs[R14] & ~BRENAB);
+
+ /* Clock mode control. */
+ write_zsreg(uap, R11, regs[R11]);
+
+ /* Lower and upper byte of baud rate generator divisor. */
+ write_zsreg(uap, R12, regs[R12]);
+ write_zsreg(uap, R13, regs[R13]);
+
+ /* Now rewrite R14, with BRENAB (if set). */
+ write_zsreg(uap, R14, regs[R14]);
+
+ /* Reset external status interrupts. */
+ write_zsreg(uap, R0, RES_EXT_INT);
+ write_zsreg(uap, R0, RES_EXT_INT);
+
+ /* Rewrite R3/R5, this time without enables masked. */
+ write_zsreg(uap, R3, regs[R3]);
+ write_zsreg(uap, R5, regs[R5]);
+
+ /* Rewrite R1, this time without IRQ enabled masked. */
+ write_zsreg(uap, R1, regs[R1]);
+
+ /* Enable interrupts */
+ write_zsreg(uap, R9, regs[R9]);
+}
+
+/*
+ * We do like sunzilog to avoid disrupting pending Tx
+ * Reprogram the Zilog channel HW registers with the copies found in the
+ * software state struct. If the transmitter is busy, we defer this update
+ * until the next TX complete interrupt. Else, we do it right now.
+ *
+ * The UART port lock must be held and local interrupts disabled.
+ */
+static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
+{
+ if (!ZS_REGS_HELD(uap)) {
+ if (ZS_TX_ACTIVE(uap)) {
+ uap->flags |= PMACZILOG_FLAG_REGS_HELD;
+ } else {
+ pmz_debug("pmz: maybe_update_regs: updating\n");
+ pmz_load_zsregs(uap, uap->curregs);
+ }
+ }
+}
+
+static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap,
+ struct pt_regs *regs)
+{
+ struct tty_struct *tty = NULL;
+ unsigned char ch, r1, drop, error;
+ int loops = 0;
+
+ retry:
+ /* The interrupt can be enabled when the port isn't open, typically
+ * that happens when using one port is open and the other closed (stale
+ * interrupt) or when one port is used as a console.
+ */
+ if (!ZS_IS_OPEN(uap)) {
+ pmz_debug("pmz: draining input\n");
+ /* Port is closed, drain input data */
+ for (;;) {
+ if ((++loops) > 1000)
+ goto flood;
+ (void)read_zsreg(uap, R1);
+ write_zsreg(uap, R0, ERR_RES);
+ (void)read_zsdata(uap);
+ ch = read_zsreg(uap, R0);
+ if (!(ch & Rx_CH_AV))
+ break;
+ }
+ return NULL;
+ }
+
+ /* Sanity check, make sure the old bug is no longer happening */
+ if (uap->port.info == NULL || uap->port.info->tty == NULL) {
+ WARN_ON(1);
+ (void)read_zsdata(uap);
+ return NULL;
+ }
+ tty = uap->port.info->tty;
+
+ while (1) {
+ error = 0;
+ drop = 0;
+
+ if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
+ /* Have to drop the lock here */
+ pmz_debug("pmz: flip overflow\n");
+ spin_unlock(&uap->port.lock);
+ tty->flip.work.func((void *)tty);
+ spin_lock(&uap->port.lock);
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ drop = 1;
+ if (ZS_IS_ASLEEP(uap))
+ return NULL;
+ if (!ZS_IS_OPEN(uap))
+ goto retry;
+ }
+
+ r1 = read_zsreg(uap, R1);
+ ch = read_zsdata(uap);
+
+ if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+ write_zsreg(uap, R0, ERR_RES);
+ zssync(uap);
+ }
+
+ ch &= uap->parity_mask;
+ if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
+ uap->flags &= ~PMACZILOG_FLAG_BREAK;
+ }
+
+#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
+#ifdef USE_CTRL_O_SYSRQ
+ /* Handle the SysRq ^O Hack */
+ if (ch == '\x0f') {
+ uap->port.sysrq = jiffies + HZ*5;
+ goto next_char;
+ }
+#endif /* USE_CTRL_O_SYSRQ */
+ if (uap->port.sysrq) {
+ int swallow;
+ spin_unlock(&uap->port.lock);
+ swallow = uart_handle_sysrq_char(&uap->port, ch, regs);
+ spin_lock(&uap->port.lock);
+ if (swallow)
+ goto next_char;
+ }
+#endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
+
+ /* A real serial line, record the character and status. */
+ if (drop)
+ goto next_char;
+
+ *tty->flip.char_buf_ptr = ch;
+ *tty->flip.flag_buf_ptr = TTY_NORMAL;
+ uap->port.icount.rx++;
+
+ if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
+ error = 1;
+ if (r1 & BRK_ABRT) {
+ pmz_debug("pmz: got break !\n");
+ r1 &= ~(PAR_ERR | CRC_ERR);
+ uap->port.icount.brk++;
+ if (uart_handle_break(&uap->port))
+ goto next_char;
+ }
+ else if (r1 & PAR_ERR)
+ uap->port.icount.parity++;
+ else if (r1 & CRC_ERR)
+ uap->port.icount.frame++;
+ if (r1 & Rx_OVR)
+ uap->port.icount.overrun++;
+ r1 &= uap->port.read_status_mask;
+ if (r1 & BRK_ABRT)
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ else if (r1 & PAR_ERR)
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ else if (r1 & CRC_ERR)
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ }
+
+ if (uap->port.ignore_status_mask == 0xff ||
+ (r1 & uap->port.ignore_status_mask) == 0) {
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ }
+ if ((r1 & Rx_OVR) &&
+ tty->flip.count < TTY_FLIPBUF_SIZE) {
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ }
+ next_char:
+ /* We can get stuck in an infinite loop getting char 0 when the
+ * line is in a wrong HW state, we break that here.
+ * When that happens, I disable the receive side of the driver.
+ * Note that what I've been experiencing is a real irq loop where
+ * I'm getting flooded regardless of the actual port speed.
+ * Something stange is going on with the HW
+ */
+ if ((++loops) > 1000)
+ goto flood;
+ ch = read_zsreg(uap, R0);
+ if (!(ch & Rx_CH_AV))
+ break;
+ }
+
+ return tty;
+ flood:
+ uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+ write_zsreg(uap, R1, uap->curregs[R1]);
+ zssync(uap);
+ dev_err(&uap->dev->ofdev.dev, "pmz: rx irq flood !\n");
+ return tty;
+}
+
+static void pmz_status_handle(struct uart_pmac_port *uap, struct pt_regs *regs)
+{
+ unsigned char status;
+
+ status = read_zsreg(uap, R0);
+ write_zsreg(uap, R0, RES_EXT_INT);
+ zssync(uap);
+
+ if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
+ if (status & SYNC_HUNT)
+ uap->port.icount.dsr++;
+
+ /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
+ * But it does not tell us which bit has changed, we have to keep
+ * track of this ourselves.
+ * The CTS input is inverted for some reason. -- paulus
+ */
+ if ((status ^ uap->prev_status) & DCD)
+ uart_handle_dcd_change(&uap->port,
+ (status & DCD));
+ if ((status ^ uap->prev_status) & CTS)
+ uart_handle_cts_change(&uap->port,
+ !(status & CTS));
+
+ wake_up_interruptible(&uap->port.info->delta_msr_wait);
+ }
+
+ if (status & BRK_ABRT)
+ uap->flags |= PMACZILOG_FLAG_BREAK;
+
+ uap->prev_status = status;
+}
+
+static void pmz_transmit_chars(struct uart_pmac_port *uap)
+{
+ struct circ_buf *xmit;
+
+ if (ZS_IS_ASLEEP(uap))
+ return;
+ if (ZS_IS_CONS(uap)) {
+ unsigned char status = read_zsreg(uap, R0);
+
+ /* TX still busy? Just wait for the next TX done interrupt.
+ *
+ * It can occur because of how we do serial console writes. It would
+ * be nice to transmit console writes just like we normally would for
+ * a TTY line. (ie. buffered and TX interrupt driven). That is not
+ * easy because console writes cannot sleep. One solution might be
+ * to poll on enough port->xmit space becomming free. -DaveM
+ */
+ if (!(status & Tx_BUF_EMP))
+ return;
+ }
+
+ uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
+
+ if (ZS_REGS_HELD(uap)) {
+ pmz_load_zsregs(uap, uap->curregs);
+ uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
+ }
+
+ if (ZS_TX_STOPPED(uap)) {
+ uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
+ goto ack_tx_int;
+ }
+
+ if (uap->port.x_char) {
+ uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+ write_zsdata(uap, uap->port.x_char);
+ zssync(uap);
+ uap->port.icount.tx++;
+ uap->port.x_char = 0;
+ return;
+ }
+
+ if (uap->port.info == NULL)
+ goto ack_tx_int;
+ xmit = &uap->port.info->xmit;
+ if (uart_circ_empty(xmit)) {
+ uart_write_wakeup(&uap->port);
+ goto ack_tx_int;
+ }
+ if (uart_tx_stopped(&uap->port))
+ goto ack_tx_int;
+
+ uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+ write_zsdata(uap, xmit->buf[xmit->tail]);
+ zssync(uap);
+
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ uap->port.icount.tx++;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&uap->port);
+
+ return;
+
+ack_tx_int:
+ write_zsreg(uap, R0, RES_Tx_P);
+ zssync(uap);
+}
+
+/* Hrm... we register that twice, fixme later.... */
+static irqreturn_t pmz_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct uart_pmac_port *uap = dev_id;
+ struct uart_pmac_port *uap_a;
+ struct uart_pmac_port *uap_b;
+ int rc = IRQ_NONE;
+ struct tty_struct *tty;
+ u8 r3;
+
+ uap_a = pmz_get_port_A(uap);
+ uap_b = uap_a->mate;
+
+ spin_lock(&uap_a->port.lock);
+ r3 = read_zsreg(uap_a, R3);
+
+#ifdef DEBUG_HARD
+ pmz_debug("irq, r3: %x\n", r3);
+#endif
+ /* Channel A */
+ tty = NULL;
+ if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+ write_zsreg(uap_a, R0, RES_H_IUS);
+ zssync(uap_a);
+ if (r3 & CHAEXT)
+ pmz_status_handle(uap_a, regs);
+ if (r3 & CHARxIP)
+ tty = pmz_receive_chars(uap_a, regs);
+ if (r3 & CHATxIP)
+ pmz_transmit_chars(uap_a);
+ rc = IRQ_HANDLED;
+ }
+ spin_unlock(&uap_a->port.lock);
+ if (tty != NULL)
+ tty_flip_buffer_push(tty);
+
+ if (uap_b->node == NULL)
+ goto out;
+
+ spin_lock(&uap_b->port.lock);
+ tty = NULL;
+ if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+ write_zsreg(uap_b, R0, RES_H_IUS);
+ zssync(uap_b);
+ if (r3 & CHBEXT)
+ pmz_status_handle(uap_b, regs);
+ if (r3 & CHBRxIP)
+ tty = pmz_receive_chars(uap_b, regs);
+ if (r3 & CHBTxIP)
+ pmz_transmit_chars(uap_b);
+ rc = IRQ_HANDLED;
+ }
+ spin_unlock(&uap_b->port.lock);
+ if (tty != NULL)
+ tty_flip_buffer_push(tty);
+
+ out:
+#ifdef DEBUG_HARD
+ pmz_debug("irq done.\n");
+#endif
+ return rc;
+}
+
+/*
+ * Peek the status register, lock not held by caller
+ */
+static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
+{
+ unsigned long flags;
+ u8 status;
+
+ spin_lock_irqsave(&uap->port.lock, flags);
+ status = read_zsreg(uap, R0);
+ spin_unlock_irqrestore(&uap->port.lock, flags);
+
+ return status;
+}
+
+/*
+ * Check if transmitter is empty
+ * The port lock is not held.
+ */
+static unsigned int pmz_tx_empty(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char status;
+
+ if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+ return TIOCSER_TEMT;
+
+ status = pmz_peek_status(to_pmz(port));
+ if (status & Tx_BUF_EMP)
+ return TIOCSER_TEMT;
+ return 0;
+}
+
+/*
+ * Set Modem Control (RTS & DTR) bits
+ * The port lock is held and interrupts are disabled.
+ * Note: Shall we really filter out RTS on external ports or
+ * should that be dealt at higher level only ?
+ */
+static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char set_bits, clear_bits;
+
+ /* Do nothing for irda for now... */
+ if (ZS_IS_IRDA(uap))
+ return;
+ /* We get called during boot with a port not up yet */
+ if (ZS_IS_ASLEEP(uap) ||
+ !(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
+ return;
+
+ set_bits = clear_bits = 0;
+
+ if (ZS_IS_INTMODEM(uap)) {
+ if (mctrl & TIOCM_RTS)
+ set_bits |= RTS;
+ else
+ clear_bits |= RTS;
+ }
+ if (mctrl & TIOCM_DTR)
+ set_bits |= DTR;
+ else
+ clear_bits |= DTR;
+
+ /* NOTE: Not subject to 'transmitter active' rule. */
+ uap->curregs[R5] |= set_bits;
+ uap->curregs[R5] &= ~clear_bits;
+ if (ZS_IS_ASLEEP(uap))
+ return;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
+ set_bits, clear_bits, uap->curregs[R5]);
+ zssync(uap);
+}
+
+/*
+ * Get Modem Control bits (only the input ones, the core will
+ * or that with a cached value of the control ones)
+ * The port lock is not held.
+ */
+static unsigned int pmz_get_mctrl(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char status;
+ unsigned int ret;
+
+ if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+ return 0;
+
+ status = pmz_peek_status(to_pmz(port));
+
+ ret = 0;
+ if (status & DCD)
+ ret |= TIOCM_CAR;
+ if (status & SYNC_HUNT)
+ ret |= TIOCM_DSR;
+ if (!(status & CTS))
+ ret |= TIOCM_CTS;
+
+ return ret;
+}
+
+/*
+ * Stop TX side. Dealt like sunzilog at next Tx interrupt,
+ * though for DMA, we will have to do a bit more. What is
+ * the meaning of the tty_stop bit ? XXX
+ * The port lock is held and interrupts are disabled.
+ */
+static void pmz_stop_tx(struct uart_port *port, unsigned int tty_stop)
+{
+ to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
+}
+
+/*
+ * Kick the Tx side.
+ * The port lock is held and interrupts are disabled.
+ */
+static void pmz_start_tx(struct uart_port *port, unsigned int tty_start)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char status;
+
+ pmz_debug("pmz: start_tx()\n");
+
+ uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+ uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
+
+ if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+ return;
+
+ status = read_zsreg(uap, R0);
+
+ /* TX busy? Just wait for the TX done interrupt. */
+ if (!(status & Tx_BUF_EMP))
+ return;
+
+ /* Send the first character to jump-start the TX done
+ * IRQ sending engine.
+ */
+ if (port->x_char) {
+ write_zsdata(uap, port->x_char);
+ zssync(uap);
+ port->icount.tx++;
+ port->x_char = 0;
+ } else {
+ struct circ_buf *xmit = &port->info->xmit;
+
+ write_zsdata(uap, xmit->buf[xmit->tail]);
+ zssync(uap);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&uap->port);
+ }
+ pmz_debug("pmz: start_tx() done.\n");
+}
+
+/*
+ * Stop Rx side, basically disable emitting of
+ * Rx interrupts on the port. We don't disable the rx
+ * side of the chip proper though
+ * The port lock is held.
+ */
+static void pmz_stop_rx(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+
+ if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+ return;
+
+ pmz_debug("pmz: stop_rx()()\n");
+
+ /* Disable all RX interrupts. */
+ uap->curregs[R1] &= ~RxINT_MASK;
+ pmz_maybe_update_regs(uap);
+
+ pmz_debug("pmz: stop_rx() done.\n");
+}
+
+/*
+ * Enable modem status change interrupts
+ * The port lock is held.
+ */
+static void pmz_enable_ms(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char new_reg;
+
+ if (ZS_IS_IRDA(uap) || uap->node == NULL)
+ return;
+ new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
+ if (new_reg != uap->curregs[R15]) {
+ uap->curregs[R15] = new_reg;
+
+ if (ZS_IS_ASLEEP(uap))
+ return;
+ /* NOTE: Not subject to 'transmitter active' rule. */
+ write_zsreg(uap, R15, uap->curregs[R15]);
+ }
+}
+
+/*
+ * Control break state emission
+ * The port lock is not held.
+ */
+static void pmz_break_ctl(struct uart_port *port, int break_state)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned char set_bits, clear_bits, new_reg;
+ unsigned long flags;
+
+ if (uap->node == NULL)
+ return;
+ set_bits = clear_bits = 0;
+
+ if (break_state)
+ set_bits |= SND_BRK;
+ else
+ clear_bits |= SND_BRK;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
+ if (new_reg != uap->curregs[R5]) {
+ uap->curregs[R5] = new_reg;
+
+ /* NOTE: Not subject to 'transmitter active' rule. */
+ if (ZS_IS_ASLEEP(uap))
+ return;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ }
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * 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 pmz_set_scc_power(struct uart_pmac_port *uap, int state)
+{
+ int delay = 0;
+ int rc;
+
+ if (state) {
+ rc = pmac_call_feature(
+ PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1);
+ pmz_debug("port power on result: %d\n", rc);
+ if (ZS_IS_INTMODEM(uap)) {
+ rc = pmac_call_feature(
+ PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1);
+ delay = 2500; /* wait for 2.5s before using */
+ pmz_debug("modem power result: %d\n", rc);
+ }
+ } else {
+ /* TODO: Make that depend on a timer, don't power down
+ * immediately
+ */
+ if (ZS_IS_INTMODEM(uap)) {
+ rc = pmac_call_feature(
+ PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0);
+ pmz_debug("port power off result: %d\n", rc);
+ }
+ pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
+ }
+ return delay;
+}
+
+/*
+ * FixZeroBug....Works around a bug in the SCC receving channel.
+ * Inspired 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 pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
+{
+ write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
+ zssync(uap);
+ udelay(10);
+ write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
+ zssync(uap);
+
+ write_zsreg(uap, 4, X1CLK | MONSYNC);
+ write_zsreg(uap, 3, Rx8);
+ write_zsreg(uap, 5, Tx8 | RTS);
+ write_zsreg(uap, 9, NV); /* Didn't we already do this? */
+ write_zsreg(uap, 11, RCBR | TCBR);
+ write_zsreg(uap, 12, 0);
+ write_zsreg(uap, 13, 0);
+ write_zsreg(uap, 14, (LOOPBAK | BRSRC));
+ write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
+ write_zsreg(uap, 3, Rx8 | RxENABLE);
+ write_zsreg(uap, 0, RES_EXT_INT);
+ write_zsreg(uap, 0, RES_EXT_INT);
+ write_zsreg(uap, 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(uap, 9, NV);
+ write_zsreg(uap, 4, X16CLK | SB_MASK);
+ write_zsreg(uap, 3, Rx8);
+
+ while (read_zsreg(uap, 0) & Rx_CH_AV) {
+ (void)read_zsreg(uap, 8);
+ write_zsreg(uap, 0, RES_EXT_INT);
+ write_zsreg(uap, 0, ERR_RES);
+ }
+}
+
+/*
+ * Real startup routine, powers up the hardware and sets up
+ * the SCC. Returns a delay in ms where you need to wait before
+ * actually using the port, this is typically the internal modem
+ * powerup delay. This routine expect the lock to be taken.
+ */
+static int __pmz_startup(struct uart_pmac_port *uap)
+{
+ int pwr_delay = 0;
+
+ memset(&uap->curregs, 0, sizeof(uap->curregs));
+
+ /* Power up the SCC & underlying hardware (modem/irda) */
+ pwr_delay = pmz_set_scc_power(uap, 1);
+
+ /* Nice buggy HW ... */
+ pmz_fix_zero_bug_scc(uap);
+
+ /* Reset the channel */
+ uap->curregs[R9] = 0;
+ write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
+ zssync(uap);
+ udelay(10);
+ write_zsreg(uap, 9, 0);
+ zssync(uap);
+
+ /* Clear the interrupt registers */
+ write_zsreg(uap, R1, 0);
+ write_zsreg(uap, R0, ERR_RES);
+ write_zsreg(uap, R0, ERR_RES);
+ write_zsreg(uap, R0, RES_H_IUS);
+ write_zsreg(uap, R0, RES_H_IUS);
+
+ /* Setup some valid baud rate */
+ uap->curregs[R4] = X16CLK | SB1;
+ uap->curregs[R3] = Rx8;
+ uap->curregs[R5] = Tx8 | RTS;
+ if (!ZS_IS_IRDA(uap))
+ uap->curregs[R5] |= DTR;
+ uap->curregs[R12] = 0;
+ uap->curregs[R13] = 0;
+ uap->curregs[R14] = BRENAB;
+
+ /* Clear handshaking, enable BREAK interrupts */
+ uap->curregs[R15] = BRKIE;
+
+ /* Master interrupt enable */
+ uap->curregs[R9] |= NV | MIE;
+
+ pmz_load_zsregs(uap, uap->curregs);
+
+ /* Enable receiver and transmitter. */
+ write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
+ write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
+
+ /* Remember status for DCD/CTS changes */
+ uap->prev_status = read_zsreg(uap, R0);
+
+
+ return pwr_delay;
+}
+
+static void pmz_irda_reset(struct uart_pmac_port *uap)
+{
+ uap->curregs[R5] |= DTR;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ zssync(uap);
+ mdelay(110);
+ uap->curregs[R5] &= ~DTR;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ zssync(uap);
+ mdelay(10);
+}
+
+/*
+ * This is the "normal" startup routine, using the above one
+ * wrapped with the lock and doing a schedule delay
+ */
+static int pmz_startup(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned long flags;
+ int pwr_delay = 0;
+
+ pmz_debug("pmz: startup()\n");
+
+ if (ZS_IS_ASLEEP(uap))
+ return -EAGAIN;
+ if (uap->node == NULL)
+ return -ENODEV;
+
+ down(&pmz_irq_sem);
+
+ uap->flags |= PMACZILOG_FLAG_IS_OPEN;
+
+ /* A console is never powered down. Else, power up and
+ * initialize the chip
+ */
+ if (!ZS_IS_CONS(uap)) {
+ spin_lock_irqsave(&port->lock, flags);
+ pwr_delay = __pmz_startup(uap);
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
+
+ pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
+ if (request_irq(uap->port.irq, pmz_interrupt, SA_SHIRQ, "PowerMac Zilog", uap)) {
+ dev_err(&uap->dev->ofdev.dev,
+ "Unable to register zs interrupt handler.\n");
+ pmz_set_scc_power(uap, 0);
+ up(&pmz_irq_sem);
+ return -ENXIO;
+ }
+
+ up(&pmz_irq_sem);
+
+ /* Right now, we deal with delay by blocking here, I'll be
+ * smarter later on
+ */
+ if (pwr_delay != 0) {
+ pmz_debug("pmz: delaying %d ms\n", pwr_delay);
+ msleep(pwr_delay);
+ }
+
+ /* IrDA reset is done now */
+ if (ZS_IS_IRDA(uap))
+ pmz_irda_reset(uap);
+
+ /* Enable interrupts emission from the chip */
+ spin_lock_irqsave(&port->lock, flags);
+ uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+ if (!ZS_IS_EXTCLK(uap))
+ uap->curregs[R1] |= EXT_INT_ENAB;
+ write_zsreg(uap, R1, uap->curregs[R1]);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ pmz_debug("pmz: startup() done.\n");
+
+ return 0;
+}
+
+static void pmz_shutdown(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned long flags;
+
+ pmz_debug("pmz: shutdown()\n");
+
+ if (uap->node == NULL)
+ return;
+
+ down(&pmz_irq_sem);
+
+ /* Release interrupt handler */
+ free_irq(uap->port.irq, uap);
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
+
+ if (!ZS_IS_OPEN(uap->mate))
+ pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON;
+
+ /* Disable interrupts */
+ if (!ZS_IS_ASLEEP(uap)) {
+ uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+ write_zsreg(uap, R1, uap->curregs[R1]);
+ zssync(uap);
+ }
+
+ if (ZS_IS_CONS(uap) || ZS_IS_ASLEEP(uap)) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ up(&pmz_irq_sem);
+ return;
+ }
+
+ /* Disable receiver and transmitter. */
+ uap->curregs[R3] &= ~RxENABLE;
+ uap->curregs[R5] &= ~TxENABLE;
+
+ /* Disable all interrupts and BRK assertion. */
+ uap->curregs[R5] &= ~SND_BRK;
+ pmz_maybe_update_regs(uap);
+
+ /* Shut the chip down */
+ pmz_set_scc_power(uap, 0);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ up(&pmz_irq_sem);
+
+ pmz_debug("pmz: shutdown() done.\n");
+}
+
+/* Shared by TTY driver and serial console setup. The port lock is held
+ * and local interrupts are disabled.
+ */
+static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
+ unsigned int iflag, unsigned long baud)
+{
+ int brg;
+
+
+ /* Switch to external clocking for IrDA high clock rates. That
+ * code could be re-used for Midi interfaces with different
+ * multipliers
+ */
+ if (baud >= 115200 && ZS_IS_IRDA(uap)) {
+ uap->curregs[R4] = X1CLK;
+ uap->curregs[R11] = RCTRxCP | TCTRxCP;
+ uap->curregs[R14] = 0; /* BRG off */
+ uap->curregs[R12] = 0;
+ uap->curregs[R13] = 0;
+ uap->flags |= PMACZILOG_FLAG_IS_EXTCLK;
+ } else {
+ switch (baud) {
+ case ZS_CLOCK/16: /* 230400 */
+ uap->curregs[R4] = X16CLK;
+ uap->curregs[R11] = 0;
+ uap->curregs[R14] = 0;
+ break;
+ case ZS_CLOCK/32: /* 115200 */
+ uap->curregs[R4] = X32CLK;
+ uap->curregs[R11] = 0;
+ uap->curregs[R14] = 0;
+ break;
+ default:
+ uap->curregs[R4] = X16CLK;
+ uap->curregs[R11] = TCBR | RCBR;
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / 16);
+ uap->curregs[R12] = (brg & 255);
+ uap->curregs[R13] = ((brg >> 8) & 255);
+ uap->curregs[R14] = BRENAB;
+ }
+ uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
+ }
+
+ /* Character size, stop bits, and parity. */
+ uap->curregs[3] &= ~RxN_MASK;
+ uap->curregs[5] &= ~TxN_MASK;
+
+ switch (cflag & CSIZE) {
+ case CS5:
+ uap->curregs[3] |= Rx5;
+ uap->curregs[5] |= Tx5;
+ uap->parity_mask = 0x1f;
+ break;
+ case CS6:
+ uap->curregs[3] |= Rx6;
+ uap->curregs[5] |= Tx6;
+ uap->parity_mask = 0x3f;
+ break;
+ case CS7:
+ uap->curregs[3] |= Rx7;
+ uap->curregs[5] |= Tx7;
+ uap->parity_mask = 0x7f;
+ break;
+ case CS8:
+ default:
+ uap->curregs[3] |= Rx8;
+ uap->curregs[5] |= Tx8;
+ uap->parity_mask = 0xff;
+ break;
+ };
+ uap->curregs[4] &= ~(SB_MASK);
+ if (cflag & CSTOPB)
+ uap->curregs[4] |= SB2;
+ else
+ uap->curregs[4] |= SB1;
+ if (cflag & PARENB)
+ uap->curregs[4] |= PAR_ENAB;
+ else
+ uap->curregs[4] &= ~PAR_ENAB;
+ if (!(cflag & PARODD))
+ uap->curregs[4] |= PAR_EVEN;
+ else
+ uap->curregs[4] &= ~PAR_EVEN;
+
+ uap->port.read_status_mask = Rx_OVR;
+ if (iflag & INPCK)
+ uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
+ if (iflag & (BRKINT | PARMRK))
+ uap->port.read_status_mask |= BRK_ABRT;
+
+ uap->port.ignore_status_mask = 0;
+ if (iflag & IGNPAR)
+ uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
+ if (iflag & IGNBRK) {
+ uap->port.ignore_status_mask |= BRK_ABRT;
+ if (iflag & IGNPAR)
+ uap->port.ignore_status_mask |= Rx_OVR;
+ }
+
+ if ((cflag & CREAD) == 0)
+ uap->port.ignore_status_mask = 0xff;
+}
+
+
+/*
+ * Set the irda codec on the imac to the specified baud rate.
+ */
+static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
+{
+ u8 cmdbyte;
+ int t, version;
+
+ switch (*baud) {
+ /* SIR modes */
+ case 2400:
+ cmdbyte = 0x53;
+ break;
+ case 4800:
+ cmdbyte = 0x52;
+ break;
+ case 9600:
+ cmdbyte = 0x51;
+ break;
+ case 19200:
+ cmdbyte = 0x50;
+ break;
+ case 38400:
+ cmdbyte = 0x4f;
+ break;
+ case 57600:
+ cmdbyte = 0x4e;
+ break;
+ case 115200:
+ cmdbyte = 0x4d;
+ break;
+ /* The FIR modes aren't really supported at this point, how
+ * do we select the speed ? via the FCR on KeyLargo ?
+ */
+ case 1152000:
+ cmdbyte = 0;
+ break;
+ case 4000000:
+ cmdbyte = 0;
+ break;
+ default: /* 9600 */
+ cmdbyte = 0x51;
+ *baud = 9600;
+ break;
+ }
+
+ /* Wait for transmitter to drain */
+ t = 10000;
+ while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
+ || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
+ if (--t <= 0) {
+ dev_err(&uap->dev->ofdev.dev, "transmitter didn't drain\n");
+ return;
+ }
+ udelay(10);
+ }
+
+ /* Drain the receiver too */
+ t = 100;
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+ mdelay(10);
+ while (read_zsreg(uap, R0) & Rx_CH_AV) {
+ read_zsdata(uap);
+ mdelay(10);
+ if (--t <= 0) {
+ dev_err(&uap->dev->ofdev.dev, "receiver didn't drain\n");
+ return;
+ }
+ }
+
+ /* Switch to command mode */
+ uap->curregs[R5] |= DTR;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ zssync(uap);
+ mdelay(1);
+
+ /* Switch SCC to 19200 */
+ pmz_convert_to_zs(uap, CS8, 0, 19200);
+ pmz_load_zsregs(uap, uap->curregs);
+ mdelay(1);
+
+ /* Write get_version command byte */
+ write_zsdata(uap, 1);
+ t = 5000;
+ while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
+ if (--t <= 0) {
+ dev_err(&uap->dev->ofdev.dev,
+ "irda_setup timed out on get_version byte\n");
+ goto out;
+ }
+ udelay(10);
+ }
+ version = read_zsdata(uap);
+
+ if (version < 4) {
+ dev_info(&uap->dev->ofdev.dev, "IrDA: dongle version %d not supported\n",
+ version);
+ goto out;
+ }
+
+ /* Send speed mode */
+ write_zsdata(uap, cmdbyte);
+ t = 5000;
+ while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
+ if (--t <= 0) {
+ dev_err(&uap->dev->ofdev.dev,
+ "irda_setup timed out on speed mode byte\n");
+ goto out;
+ }
+ udelay(10);
+ }
+ t = read_zsdata(uap);
+ if (t != cmdbyte)
+ dev_err(&uap->dev->ofdev.dev,
+ "irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
+
+ dev_info(&uap->dev->ofdev.dev, "IrDA setup for %ld bps, dongle version: %d\n",
+ *baud, version);
+
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+
+ out:
+ /* Switch back to data mode */
+ uap->curregs[R5] &= ~DTR;
+ write_zsreg(uap, R5, uap->curregs[R5]);
+ zssync(uap);
+
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+ (void)read_zsdata(uap);
+}
+
+
+static void __pmz_set_termios(struct uart_port *port, struct termios *termios,
+ struct termios *old)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned long baud;
+
+ pmz_debug("pmz: set_termios()\n");
+
+ if (ZS_IS_ASLEEP(uap))
+ return;
+
+ memcpy(&uap->termios_cache, termios, sizeof(struct termios));
+
+ /* XXX Check which revs of machines actually allow 1 and 4Mb speeds
+ * on the IR dongle. Note that the IRTTY driver currently doesn't know
+ * about the FIR mode and high speed modes. So these are unused. For
+ * implementing proper support for these, we should probably add some
+ * DMA as well, at least on the Rx side, which isn't a simple thing
+ * at this point.
+ */
+ if (ZS_IS_IRDA(uap)) {
+ /* Calc baud rate */
+ baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
+ pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
+ /* Cet the irda codec to the right rate */
+ pmz_irda_setup(uap, &baud);
+ /* Set final baud rate */
+ pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
+ pmz_load_zsregs(uap, uap->curregs);
+ zssync(uap);
+ } else {
+ baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
+ pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
+ /* Make sure modem status interrupts are correctly configured */
+ if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
+ uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
+ uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
+ } else {
+ uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
+ uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
+ }
+
+ /* Load registers to the chip */
+ pmz_maybe_update_regs(uap);
+ }
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ pmz_debug("pmz: set_termios() done.\n");
+}
+
+/* The port lock is not held. */
+static void pmz_set_termios(struct uart_port *port, struct termios *termios,
+ struct termios *old)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ /* Disable IRQs on the port */
+ uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+ write_zsreg(uap, R1, uap->curregs[R1]);
+
+ /* Setup new port configuration */
+ __pmz_set_termios(port, termios, old);
+
+ /* Re-enable IRQs on the port */
+ if (ZS_IS_OPEN(uap)) {
+ uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+ if (!ZS_IS_EXTCLK(uap))
+ uap->curregs[R1] |= EXT_INT_ENAB;
+ write_zsreg(uap, R1, uap->curregs[R1]);
+ }
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *pmz_type(struct uart_port *port)
+{
+ struct uart_pmac_port *uap = to_pmz(port);
+
+ if (ZS_IS_IRDA(uap))
+ return "Z85c30 ESCC - Infrared port";
+ else if (ZS_IS_INTMODEM(uap))
+ return "Z85c30 ESCC - Internal modem";
+ return "Z85c30 ESCC - Serial port";
+}
+
+/* We do not request/release mappings of the registers here, this
+ * happens at early serial probe time.
+ */
+static void pmz_release_port(struct uart_port *port)
+{
+}
+
+static int pmz_request_port(struct uart_port *port)
+{
+ return 0;
+}
+
+/* These do not need to do anything interesting either. */
+static void pmz_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* We do not support letting the user mess with the divisor, IRQ, etc. */
+static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ return -EINVAL;
+}
+
+static struct uart_ops pmz_pops = {
+ .tx_empty = pmz_tx_empty,
+ .set_mctrl = pmz_set_mctrl,
+ .get_mctrl = pmz_get_mctrl,
+ .stop_tx = pmz_stop_tx,
+ .start_tx = pmz_start_tx,
+ .stop_rx = pmz_stop_rx,
+ .enable_ms = pmz_enable_ms,
+ .break_ctl = pmz_break_ctl,
+ .startup = pmz_startup,
+ .shutdown = pmz_shutdown,
+ .set_termios = pmz_set_termios,
+ .type = pmz_type,
+ .release_port = pmz_release_port,
+ .request_port = pmz_request_port,
+ .config_port = pmz_config_port,
+ .verify_port = pmz_verify_port,
+};
+
+/*
+ * Setup one port structure after probing, HW is down at this point,
+ * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
+ * register our console before uart_add_one_port() is called
+ */
+static int __init pmz_init_port(struct uart_pmac_port *uap)
+{
+ struct device_node *np = uap->node;
+ char *conn;
+ struct slot_names_prop {
+ int count;
+ char name[1];
+ } *slots;
+ int len;
+
+ /*
+ * Request & map chip registers
+ */
+ uap->port.mapbase = np->addrs[0].address;
+ uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
+
+ uap->control_reg = uap->port.membase;
+ uap->data_reg = uap->control_reg + 0x10;
+
+ /*
+ * Request & map DBDMA registers
+ */
+#ifdef HAS_DBDMA
+ if (np->n_addrs >= 3 && np->n_intrs >= 3)
+ uap->flags |= PMACZILOG_FLAG_HAS_DMA;
+#endif
+ if (ZS_HAS_DMA(uap)) {
+ uap->tx_dma_regs = ioremap(np->addrs[np->n_addrs - 2].address, 0x1000);
+ if (uap->tx_dma_regs == NULL) {
+ uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
+ goto no_dma;
+ }
+ uap->rx_dma_regs = ioremap(np->addrs[np->n_addrs - 1].address, 0x1000);
+ if (uap->rx_dma_regs == NULL) {
+ iounmap(uap->tx_dma_regs);
+ uap->tx_dma_regs = NULL;
+ uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
+ goto no_dma;
+ }
+ uap->tx_dma_irq = np->intrs[1].line;
+ uap->rx_dma_irq = np->intrs[2].line;
+ }
+no_dma:
+
+ /*
+ * Detect port type
+ */
+ if (device_is_compatible(np, "cobalt"))
+ uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
+ conn = get_property(np, "AAPL,connector", &len);
+ if (conn && (strcmp(conn, "infrared") == 0))
+ uap->flags |= PMACZILOG_FLAG_IS_IRDA;
+ uap->port_type = PMAC_SCC_ASYNC;
+ /* 1999 Powerbook G3 has slot-names property instead */
+ slots = (struct slot_names_prop *)get_property(np, "slot-names", &len);
+ if (slots && slots->count > 0) {
+ if (strcmp(slots->name, "IrDA") == 0)
+ uap->flags |= PMACZILOG_FLAG_IS_IRDA;
+ else if (strcmp(slots->name, "Modem") == 0)
+ uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
+ }
+ if (ZS_IS_IRDA(uap))
+ uap->port_type = PMAC_SCC_IRDA;
+ if (ZS_IS_INTMODEM(uap)) {
+ 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 :
+ uap->port_type = PMAC_SCC_I2S1;
+ }
+ printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
+ mid ? (*mid) : 0);
+ } else {
+ printk(KERN_INFO "pmac_zilog: serial modem detected\n");
+ }
+ }
+
+ /*
+ * Init remaining bits of "port" structure
+ */
+ uap->port.iotype = SERIAL_IO_MEM;
+ uap->port.irq = np->intrs[0].line;
+ uap->port.uartclk = ZS_CLOCK;
+ uap->port.fifosize = 1;
+ uap->port.ops = &pmz_pops;
+ uap->port.type = PORT_PMAC_ZILOG;
+ uap->port.flags = 0;
+
+ /* Setup some valid baud rate information in the register
+ * shadows so we don't write crap there before baud rate is
+ * first initialized.
+ */
+ pmz_convert_to_zs(uap, CS8, 0, 9600);
+
+ return 0;
+}
+
+/*
+ * Get rid of a port on module removal
+ */
+static void pmz_dispose_port(struct uart_pmac_port *uap)
+{
+ struct device_node *np;
+
+ np = uap->node;
+ iounmap(uap->rx_dma_regs);
+ iounmap(uap->tx_dma_regs);
+ iounmap(uap->control_reg);
+ uap->node = NULL;
+ of_node_put(np);
+ memset(uap, 0, sizeof(struct uart_pmac_port));
+}
+
+/*
+ * Called upon match with an escc node in the devive-tree.
+ */
+static int pmz_attach(struct macio_dev *mdev, const struct of_match *match)
+{
+ int i;
+
+ /* Iterate the pmz_ports array to find a matching entry
+ */
+ for (i = 0; i < MAX_ZS_PORTS; i++)
+ if (pmz_ports[i].node == mdev->ofdev.node) {
+ struct uart_pmac_port *uap = &pmz_ports[i];
+
+ uap->dev = mdev;
+ dev_set_drvdata(&mdev->ofdev.dev, uap);
+ if (macio_request_resources(uap->dev, "pmac_zilog"))
+ printk(KERN_WARNING "%s: Failed to request resource"
+ ", port still active\n",
+ uap->node->name);
+ else
+ uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/*
+ * That one should not be called, macio isn't really a hotswap device,
+ * we don't expect one of those serial ports to go away...
+ */
+static int pmz_detach(struct macio_dev *mdev)
+{
+ struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
+
+ if (!uap)
+ return -ENODEV;
+
+ if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
+ macio_release_resources(uap->dev);
+ uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
+ }
+ dev_set_drvdata(&mdev->ofdev.dev, NULL);
+ uap->dev = NULL;
+
+ return 0;
+}
+
+
+static int pmz_suspend(struct macio_dev *mdev, u32 pm_state)
+{
+ struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
+ struct uart_state *state;
+ unsigned long flags;
+
+ if (uap == NULL) {
+ printk("HRM... pmz_suspend with NULL uap\n");
+ return 0;
+ }
+
+ if (pm_state == mdev->ofdev.dev.power.power_state || pm_state < 2)
+ return 0;
+
+ pmz_debug("suspend, switching to state %d\n", pm_state);
+
+ state = pmz_uart_reg.state + uap->port.line;
+
+ down(&pmz_irq_sem);
+ down(&state->sem);
+
+ spin_lock_irqsave(&uap->port.lock, flags);
+
+ if (ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)) {
+ /* Disable receiver and transmitter. */
+ uap->curregs[R3] &= ~RxENABLE;
+ uap->curregs[R5] &= ~TxENABLE;
+
+ /* Disable all interrupts and BRK assertion. */
+ uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+ uap->curregs[R5] &= ~SND_BRK;
+ pmz_load_zsregs(uap, uap->curregs);
+ uap->flags |= PMACZILOG_FLAG_IS_ASLEEP;
+ mb();
+ }
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
+
+ if (ZS_IS_OPEN(uap) || ZS_IS_OPEN(uap->mate))
+ if (ZS_IS_ASLEEP(uap->mate) && ZS_IS_IRQ_ON(pmz_get_port_A(uap))) {
+ pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON;
+ disable_irq(uap->port.irq);
+ }
+
+ if (ZS_IS_CONS(uap))
+ uap->port.cons->flags &= ~CON_ENABLED;
+
+ /* Shut the chip down */
+ pmz_set_scc_power(uap, 0);
+
+ up(&state->sem);
+ up(&pmz_irq_sem);
+
+ pmz_debug("suspend, switching complete\n");
+
+ mdev->ofdev.dev.power.power_state = pm_state;
+
+ return 0;
+}
+
+
+static int pmz_resume(struct macio_dev *mdev)
+{
+ struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
+ struct uart_state *state;
+ unsigned long flags;
+ int pwr_delay = 0;
+
+ if (uap == NULL)
+ return 0;
+
+ if (mdev->ofdev.dev.power.power_state == 0)
+ return 0;
+
+ pmz_debug("resume, switching to state 0\n");
+
+ state = pmz_uart_reg.state + uap->port.line;
+
+ down(&pmz_irq_sem);
+ down(&state->sem);
+
+ spin_lock_irqsave(&uap->port.lock, flags);
+ if (!ZS_IS_OPEN(uap) && !ZS_IS_CONS(uap)) {
+ spin_unlock_irqrestore(&uap->port.lock, flags);
+ goto bail;
+ }
+ pwr_delay = __pmz_startup(uap);
+
+ /* Take care of config that may have changed while asleep */
+ __pmz_set_termios(&uap->port, &uap->termios_cache, NULL);
+
+ if (ZS_IS_OPEN(uap)) {
+ /* Enable interrupts */
+ uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+ if (!ZS_IS_EXTCLK(uap))
+ uap->curregs[R1] |= EXT_INT_ENAB;
+ write_zsreg(uap, R1, uap->curregs[R1]);
+ }
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
+
+ if (ZS_IS_CONS(uap))
+ uap->port.cons->flags |= CON_ENABLED;
+
+ /* Re-enable IRQ on the controller */
+ if (ZS_IS_OPEN(uap) && !ZS_IS_IRQ_ON(pmz_get_port_A(uap))) {
+ pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
+ enable_irq(uap->port.irq);
+ }
+
+ bail:
+ up(&state->sem);
+ up(&pmz_irq_sem);
+
+ /* Right now, we deal with delay by blocking here, I'll be
+ * smarter later on
+ */
+ if (pwr_delay != 0) {
+ pmz_debug("pmz: delaying %d ms\n", pwr_delay);
+ msleep(pwr_delay);
+ }
+
+ pmz_debug("resume, switching complete\n");
+
+ mdev->ofdev.dev.power.power_state = 0;
+
+ return 0;
+}
+
+/*
+ * Probe all ports in the system and build the ports array, we register
+ * with the serial layer at this point, the macio-type probing is only
+ * used later to "attach" to the sysfs tree so we get power management
+ * events
+ */
+static int __init pmz_probe(void)
+{
+ struct device_node *node_p, *node_a, *node_b, *np;
+ int count = 0;
+ int rc;
+
+ /*
+ * Find all escc chips in the system
+ */
+ node_p = of_find_node_by_name(NULL, "escc");
+ while (node_p) {
+ /*
+ * First get channel A/B node pointers
+ *
+ * TODO: Add routines with proper locking to do that...
+ */
+ node_a = node_b = NULL;
+ for (np = NULL; (np = of_get_next_child(node_p, np)) != NULL;) {
+ if (strncmp(np->name, "ch-a", 4) == 0)
+ node_a = of_node_get(np);
+ else if (strncmp(np->name, "ch-b", 4) == 0)
+ node_b = of_node_get(np);
+ }
+ if (!node_a && !node_b) {
+ of_node_put(node_a);
+ of_node_put(node_b);
+ printk(KERN_ERR "pmac_zilog: missing node %c for escc %s\n",
+ (!node_a) ? 'a' : 'b', node_p->full_name);
+ goto next;
+ }
+
+ /*
+ * Fill basic fields in the port structures
+ */
+ pmz_ports[count].mate = &pmz_ports[count+1];
+ pmz_ports[count+1].mate = &pmz_ports[count];
+ pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
+ pmz_ports[count].node = node_a;
+ pmz_ports[count+1].node = node_b;
+ pmz_ports[count].port.line = count;
+ pmz_ports[count+1].port.line = count+1;
+
+ /*
+ * Setup the ports for real
+ */
+ rc = pmz_init_port(&pmz_ports[count]);
+ if (rc == 0 && node_b != NULL)
+ rc = pmz_init_port(&pmz_ports[count+1]);
+ if (rc != 0) {
+ of_node_put(node_a);
+ of_node_put(node_b);
+ memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port));
+ memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port));
+ goto next;
+ }
+ count += 2;
+next:
+ node_p = of_find_node_by_name(node_p, "escc");
+ }
+ pmz_ports_count = count;
+
+ return 0;
+}
+
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+
+static void pmz_console_write(struct console *con, const char *s, unsigned int count);
+static int __init pmz_console_setup(struct console *co, char *options);
+
+static struct console pmz_console = {
+ .name = "ttyS",
+ .write = pmz_console_write,
+ .device = uart_console_device,
+ .setup = pmz_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &pmz_uart_reg,
+};
+
+#define PMACZILOG_CONSOLE &pmz_console
+#else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+#define PMACZILOG_CONSOLE (NULL)
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
+/*
+ * Register the driver, console driver and ports with the serial
+ * core
+ */
+static int __init pmz_register(void)
+{
+ int i, rc;
+
+ pmz_uart_reg.nr = pmz_ports_count;
+ pmz_uart_reg.cons = PMACZILOG_CONSOLE;
+ pmz_uart_reg.minor = 64;
+
+ /*
+ * Register this driver with the serial core
+ */
+ rc = uart_register_driver(&pmz_uart_reg);
+ if (rc)
+ return rc;
+
+ /*
+ * Register each port with the serial core
+ */
+ for (i = 0; i < pmz_ports_count; i++) {
+ struct uart_pmac_port *uport = &pmz_ports[i];
+ /* NULL node may happen on wallstreet */
+ if (uport->node != NULL)
+ rc = uart_add_one_port(&pmz_uart_reg, &uport->port);
+ if (rc)
+ goto err_out;
+ }
+
+ return 0;
+err_out:
+ while (i-- > 0) {
+ struct uart_pmac_port *uport = &pmz_ports[i];
+ uart_remove_one_port(&pmz_uart_reg, &uport->port);
+ }
+ uart_unregister_driver(&pmz_uart_reg);
+ return rc;
+}
+
+static struct of_match pmz_match[] =
+{
+ {
+ .name = "ch-a",
+ .type = OF_ANY_MATCH,
+ .compatible = OF_ANY_MATCH
+ },
+ {
+ .name = "ch-b",
+ .type = OF_ANY_MATCH,
+ .compatible = OF_ANY_MATCH
+ },
+ {},
+};
+
+static struct macio_driver pmz_driver =
+{
+ .name = "pmac_zilog",
+ .match_table = pmz_match,
+ .probe = pmz_attach,
+ .remove = pmz_detach,
+ .suspend = pmz_suspend,
+ .resume = pmz_resume,
+};
+
+static int __init init_pmz(void)
+{
+ int rc, i;
+ printk(KERN_INFO "%s\n", version);
+
+ /*
+ * First, we need to do a direct OF-based probe pass. We
+ * do that because we want serial console up before the
+ * macio stuffs calls us back, and since that makes it
+ * easier to pass the proper number of channels to
+ * uart_register_driver()
+ */
+ if (pmz_ports_count == 0)
+ pmz_probe();
+
+ /*
+ * Bail early if no port found
+ */
+ if (pmz_ports_count == 0)
+ return -ENODEV;
+
+ /*
+ * Now we register with the serial layer
+ */
+ rc = pmz_register();
+ if (rc) {
+ printk(KERN_ERR
+ "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n"
+ "pmac_zilog: Did another serial driver already claim the minors?\n");
+ /* effectively "pmz_unprobe()" */
+ for (i=0; i < pmz_ports_count; i++)
+ pmz_dispose_port(&pmz_ports[i]);
+ return rc;
+ }
+
+ /*
+ * Then we register the macio driver itself
+ */
+ return macio_register_driver(&pmz_driver);
+}
+
+static void __exit exit_pmz(void)
+{
+ int i;
+
+ /* Get rid of macio-driver (detach from macio) */
+ macio_unregister_driver(&pmz_driver);
+
+ for (i = 0; i < pmz_ports_count; i++) {
+ struct uart_pmac_port *uport = &pmz_ports[i];
+ if (uport->node != NULL) {
+ uart_remove_one_port(&pmz_uart_reg, &uport->port);
+ pmz_dispose_port(uport);
+ }
+ }
+ /* Unregister UART driver */
+ uart_unregister_driver(&pmz_uart_reg);
+}
+
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+static void pmz_console_write(struct console *con, const char *s, unsigned int count)
+{
+ struct uart_pmac_port *uap = &pmz_ports[con->index];
+ unsigned long flags;
+ int i;
+
+ if (ZS_IS_ASLEEP(uap))
+ return;
+ spin_lock_irqsave(&uap->port.lock, flags);
+
+ /* Turn of interrupts and enable the transmitter. */
+ write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB);
+ write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR);
+
+ for (i = 0; i < count; i++) {
+ /* Wait for the transmit buffer to empty. */
+ while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
+ udelay(5);
+ write_zsdata(uap, s[i]);
+ if (s[i] == 10) {
+ while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
+ udelay(5);
+ write_zsdata(uap, R13);
+ }
+ }
+
+ /* Restore the values in the registers. */
+ write_zsreg(uap, R1, uap->curregs[1]);
+ /* Don't disable the transmitter. */
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+/*
+ * Setup the serial console
+ */
+static int __init pmz_console_setup(struct console *co, char *options)
+{
+ struct uart_pmac_port *uap;
+ struct uart_port *port;
+ int baud = 38400;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+ unsigned long pwr_delay;
+
+ /*
+ * XServe's default to 57600 bps
+ */
+ if (machine_is_compatible("RackMac1,1")
+ || machine_is_compatible("RackMac1,2")
+ || machine_is_compatible("MacRISC4"))
+ baud = 57600;
+
+ /*
+ * Check whether an invalid uart number has been specified, and
+ * if so, search for the first available port that does have
+ * console support.
+ */
+ if (co->index >= pmz_ports_count)
+ co->index = 0;
+ uap = &pmz_ports[co->index];
+ if (uap->node == NULL)
+ return -ENODEV;
+ port = &uap->port;
+
+ /*
+ * Mark port as beeing a console
+ */
+ uap->flags |= PMACZILOG_FLAG_IS_CONS;
+
+ /*
+ * Temporary fix for uart layer who didn't setup the spinlock yet
+ */
+ spin_lock_init(&port->lock);
+
+ /*
+ * Enable the hardware
+ */
+ pwr_delay = __pmz_startup(uap);
+ if (pwr_delay)
+ mdelay(pwr_delay);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static int __init pmz_console_init(void)
+{
+ /* Probe ports */
+ pmz_probe();
+
+ /* TODO: Autoprobe console based on OF */
+ /* pmz_console.index = i; */
+ register_console(&pmz_console);
+
+ return 0;
+
+}
+console_initcall(pmz_console_init);
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
+module_init(init_pmz);
+module_exit(exit_pmz);