From ab4382d27412e7e3e7c936e8d50d8888dfac3df8 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Thu, 13 Jan 2011 12:10:18 -0800
Subject: tty: move drivers/serial/ to drivers/tty/serial/
The serial drivers are really just tty drivers, so move them to
drivers/tty/ to make things a bit neater overall.
This is part of the tty/serial driver movement proceedure as proposed by
Arnd Bergmann and approved by everyone involved a number of months ago.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Cc: Michael H. Warfield <mhw@wittsend.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/tty/serial/sunzilog.c | 1655 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 1655 insertions(+)
create mode 100644 drivers/tty/serial/sunzilog.c
(limited to 'drivers/tty/serial/sunzilog.c')
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
new file mode 100644
index 000000000000..c1967ac1c07f
--- /dev/null
+++ b/drivers/tty/serial/sunzilog.c
@@ -0,0 +1,1655 @@
+/* sunzilog.c: Zilog serial driver for Sparc systems.
+ *
+ * Driver for Zilog serial chips found on Sun workstations and
+ * servers. This driver could actually be made more generic.
+ *
+ * This is based on the old drivers/sbus/char/zs.c code. A lot
+ * of code has been simply moved over directly from there but
+ * much has been rewritten. Credits therefore go out to Eddie
+ * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
+ * work there.
+ *
+ * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#ifdef CONFIG_SERIO
+#include <linux/serio.h>
+#endif
+#include <linux/init.h>
+#include <linux/of_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+
+#if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "suncore.h"
+#include "sunzilog.h"
+
+/* On 32-bit sparcs we need to delay after register accesses
+ * to accommodate sun4 systems, but we do not need to flush writes.
+ * On 64-bit sparc we only need to flush single writes to ensure
+ * completion.
+ */
+#ifndef CONFIG_SPARC64
+#define ZSDELAY() udelay(5)
+#define ZSDELAY_LONG() udelay(20)
+#define ZS_WSYNC(channel) do { } while (0)
+#else
+#define ZSDELAY()
+#define ZSDELAY_LONG()
+#define ZS_WSYNC(__channel) \
+ readb(&((__channel)->control))
+#endif
+
+#define ZS_CLOCK 4915200 /* Zilog input clock rate. */
+#define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_sunzilog_port {
+ struct uart_port port;
+
+ /* IRQ servicing chain. */
+ struct uart_sunzilog_port *next;
+
+ /* Current values of Zilog write registers. */
+ unsigned char curregs[NUM_ZSREGS];
+
+ unsigned int flags;
+#define SUNZILOG_FLAG_CONS_KEYB 0x00000001
+#define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
+#define SUNZILOG_FLAG_IS_CONS 0x00000004
+#define SUNZILOG_FLAG_IS_KGDB 0x00000008
+#define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
+#define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
+#define SUNZILOG_FLAG_REGS_HELD 0x00000040
+#define SUNZILOG_FLAG_TX_STOPPED 0x00000080
+#define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
+#define SUNZILOG_FLAG_ESCC 0x00000200
+#define SUNZILOG_FLAG_ISR_HANDLER 0x00000400
+
+ unsigned int cflag;
+
+ unsigned char parity_mask;
+ unsigned char prev_status;
+
+#ifdef CONFIG_SERIO
+ struct serio serio;
+ int serio_open;
+#endif
+};
+
+static void sunzilog_putchar(struct uart_port *port, int ch);
+
+#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
+#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
+
+#define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
+#define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
+#define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
+#define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
+#define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
+#define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
+#define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
+#define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
+#define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
+
+/* Reading and writing Zilog8530 registers. The delays are to make this
+ * driver work on the Sun4 which needs a settling delay after each chip
+ * register access, other machines handle this in hardware via auxiliary
+ * flip-flops which implement the settle time we do in software.
+ *
+ * The port lock must be held and local IRQs must be disabled
+ * when {read,write}_zsreg is invoked.
+ */
+static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
+ unsigned char reg)
+{
+ unsigned char retval;
+
+ writeb(reg, &channel->control);
+ ZSDELAY();
+ retval = readb(&channel->control);
+ ZSDELAY();
+
+ return retval;
+}
+
+static void write_zsreg(struct zilog_channel __iomem *channel,
+ unsigned char reg, unsigned char value)
+{
+ writeb(reg, &channel->control);
+ ZSDELAY();
+ writeb(value, &channel->control);
+ ZSDELAY();
+}
+
+static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
+{
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ unsigned char regval;
+
+ regval = readb(&channel->control);
+ ZSDELAY();
+ if (regval & Rx_CH_AV)
+ break;
+
+ regval = read_zsreg(channel, R1);
+ readb(&channel->data);
+ ZSDELAY();
+
+ if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+ writeb(ERR_RES, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+ }
+ }
+}
+
+/* This function must only be called when the TX is not busy. The UART
+ * port lock must be held and local interrupts disabled.
+ */
+static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
+{
+ int i;
+ int escc;
+ unsigned char r15;
+
+ /* Let pending transmits finish. */
+ for (i = 0; i < 1000; i++) {
+ unsigned char stat = read_zsreg(channel, R1);
+ if (stat & ALL_SNT)
+ break;
+ udelay(100);
+ }
+
+ writeb(ERR_RES, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ sunzilog_clear_fifo(channel);
+
+ /* Disable all interrupts. */
+ write_zsreg(channel, R1,
+ regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
+
+ /* Set parity, sync config, stop bits, and clock divisor. */
+ write_zsreg(channel, R4, regs[R4]);
+
+ /* Set misc. TX/RX control bits. */
+ write_zsreg(channel, R10, regs[R10]);
+
+ /* Set TX/RX controls sans the enable bits. */
+ write_zsreg(channel, R3, regs[R3] & ~RxENAB);
+ write_zsreg(channel, R5, regs[R5] & ~TxENAB);
+
+ /* Synchronous mode config. */
+ write_zsreg(channel, R6, regs[R6]);
+ write_zsreg(channel, R7, regs[R7]);
+
+ /* Don't mess with the interrupt vector (R2, unused by us) and
+ * master interrupt control (R9). We make sure this is setup
+ * properly at probe time then never touch it again.
+ */
+
+ /* Disable baud generator. */
+ write_zsreg(channel, R14, regs[R14] & ~BRENAB);
+
+ /* Clock mode control. */
+ write_zsreg(channel, R11, regs[R11]);
+
+ /* Lower and upper byte of baud rate generator divisor. */
+ write_zsreg(channel, R12, regs[R12]);
+ write_zsreg(channel, R13, regs[R13]);
+
+ /* Now rewrite R14, with BRENAB (if set). */
+ write_zsreg(channel, R14, regs[R14]);
+
+ /* External status interrupt control. */
+ write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
+
+ /* ESCC Extension Register */
+ r15 = read_zsreg(channel, R15);
+ if (r15 & 0x01) {
+ write_zsreg(channel, R7, regs[R7p]);
+
+ /* External status interrupt and FIFO control. */
+ write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
+ escc = 1;
+ } else {
+ /* Clear FIFO bit case it is an issue */
+ regs[R15] &= ~FIFOEN;
+ escc = 0;
+ }
+
+ /* Reset external status interrupts. */
+ write_zsreg(channel, R0, RES_EXT_INT); /* First Latch */
+ write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
+
+ /* Rewrite R3/R5, this time without enables masked. */
+ write_zsreg(channel, R3, regs[R3]);
+ write_zsreg(channel, R5, regs[R5]);
+
+ /* Rewrite R1, this time without IRQ enabled masked. */
+ write_zsreg(channel, R1, regs[R1]);
+
+ return escc;
+}
+
+/* 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 sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
+ struct zilog_channel __iomem *channel)
+{
+ if (!ZS_REGS_HELD(up)) {
+ if (ZS_TX_ACTIVE(up)) {
+ up->flags |= SUNZILOG_FLAG_REGS_HELD;
+ } else {
+ __load_zsregs(channel, up->curregs);
+ }
+ }
+}
+
+static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
+{
+ unsigned int cur_cflag = up->cflag;
+ int brg, new_baud;
+
+ up->cflag &= ~CBAUD;
+ up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
+
+ brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+ up->curregs[R12] = (brg & 0xff);
+ up->curregs[R13] = (brg >> 8) & 0xff;
+ sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
+}
+
+static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
+ unsigned char ch, int is_break)
+{
+ if (ZS_IS_KEYB(up)) {
+ /* Stop-A is handled by drivers/char/keyboard.c now. */
+#ifdef CONFIG_SERIO
+ if (up->serio_open)
+ serio_interrupt(&up->serio, ch, 0);
+#endif
+ } else if (ZS_IS_MOUSE(up)) {
+ int ret = suncore_mouse_baud_detection(ch, is_break);
+
+ switch (ret) {
+ case 2:
+ sunzilog_change_mouse_baud(up);
+ /* fallthru */
+ case 1:
+ break;
+
+ case 0:
+#ifdef CONFIG_SERIO
+ if (up->serio_open)
+ serio_interrupt(&up->serio, ch, 0);
+#endif
+ break;
+ };
+ }
+}
+
+static struct tty_struct *
+sunzilog_receive_chars(struct uart_sunzilog_port *up,
+ struct zilog_channel __iomem *channel)
+{
+ struct tty_struct *tty;
+ unsigned char ch, r1, flag;
+
+ tty = NULL;
+ if (up->port.state != NULL && /* Unopened serial console */
+ up->port.state->port.tty != NULL) /* Keyboard || mouse */
+ tty = up->port.state->port.tty;
+
+ for (;;) {
+
+ r1 = read_zsreg(channel, R1);
+ if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+ writeb(ERR_RES, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+ }
+
+ ch = readb(&channel->control);
+ ZSDELAY();
+
+ /* This funny hack depends upon BRK_ABRT not interfering
+ * with the other bits we care about in R1.
+ */
+ if (ch & BRK_ABRT)
+ r1 |= BRK_ABRT;
+
+ if (!(ch & Rx_CH_AV))
+ break;
+
+ ch = readb(&channel->data);
+ ZSDELAY();
+
+ ch &= up->parity_mask;
+
+ if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
+ sunzilog_kbdms_receive_chars(up, ch, 0);
+ continue;
+ }
+
+ if (tty == NULL) {
+ uart_handle_sysrq_char(&up->port, ch);
+ continue;
+ }
+
+ /* A real serial line, record the character and status. */
+ flag = TTY_NORMAL;
+ up->port.icount.rx++;
+ if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
+ if (r1 & BRK_ABRT) {
+ r1 &= ~(PAR_ERR | CRC_ERR);
+ up->port.icount.brk++;
+ if (uart_handle_break(&up->port))
+ continue;
+ }
+ else if (r1 & PAR_ERR)
+ up->port.icount.parity++;
+ else if (r1 & CRC_ERR)
+ up->port.icount.frame++;
+ if (r1 & Rx_OVR)
+ up->port.icount.overrun++;
+ r1 &= up->port.read_status_mask;
+ if (r1 & BRK_ABRT)
+ flag = TTY_BREAK;
+ else if (r1 & PAR_ERR)
+ flag = TTY_PARITY;
+ else if (r1 & CRC_ERR)
+ flag = TTY_FRAME;
+ }
+ if (uart_handle_sysrq_char(&up->port, ch))
+ continue;
+
+ if (up->port.ignore_status_mask == 0xff ||
+ (r1 & up->port.ignore_status_mask) == 0) {
+ tty_insert_flip_char(tty, ch, flag);
+ }
+ if (r1 & Rx_OVR)
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+ }
+
+ return tty;
+}
+
+static void sunzilog_status_handle(struct uart_sunzilog_port *up,
+ struct zilog_channel __iomem *channel)
+{
+ unsigned char status;
+
+ status = readb(&channel->control);
+ ZSDELAY();
+
+ writeb(RES_EXT_INT, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ if (status & BRK_ABRT) {
+ if (ZS_IS_MOUSE(up))
+ sunzilog_kbdms_receive_chars(up, 0, 1);
+ if (ZS_IS_CONS(up)) {
+ /* Wait for BREAK to deassert to avoid potentially
+ * confusing the PROM.
+ */
+ while (1) {
+ status = readb(&channel->control);
+ ZSDELAY();
+ if (!(status & BRK_ABRT))
+ break;
+ }
+ sun_do_break();
+ return;
+ }
+ }
+
+ if (ZS_WANTS_MODEM_STATUS(up)) {
+ if (status & SYNC)
+ up->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.
+ */
+ if ((status ^ up->prev_status) ^ DCD)
+ uart_handle_dcd_change(&up->port,
+ (status & DCD));
+ if ((status ^ up->prev_status) ^ CTS)
+ uart_handle_cts_change(&up->port,
+ (status & CTS));
+
+ wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+ }
+
+ up->prev_status = status;
+}
+
+static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
+ struct zilog_channel __iomem *channel)
+{
+ struct circ_buf *xmit;
+
+ if (ZS_IS_CONS(up)) {
+ unsigned char status = readb(&channel->control);
+ ZSDELAY();
+
+ /* 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;
+ }
+
+ up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
+
+ if (ZS_REGS_HELD(up)) {
+ __load_zsregs(channel, up->curregs);
+ up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
+ }
+
+ if (ZS_TX_STOPPED(up)) {
+ up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
+ goto ack_tx_int;
+ }
+
+ if (up->port.x_char) {
+ up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+ writeb(up->port.x_char, &channel->data);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ up->port.icount.tx++;
+ up->port.x_char = 0;
+ return;
+ }
+
+ if (up->port.state == NULL)
+ goto ack_tx_int;
+ xmit = &up->port.state->xmit;
+ if (uart_circ_empty(xmit))
+ goto ack_tx_int;
+
+ if (uart_tx_stopped(&up->port))
+ goto ack_tx_int;
+
+ up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+ writeb(xmit->buf[xmit->tail], &channel->data);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ up->port.icount.tx++;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&up->port);
+
+ return;
+
+ack_tx_int:
+ writeb(RES_Tx_P, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+}
+
+static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
+{
+ struct uart_sunzilog_port *up = dev_id;
+
+ while (up) {
+ struct zilog_channel __iomem *channel
+ = ZILOG_CHANNEL_FROM_PORT(&up->port);
+ struct tty_struct *tty;
+ unsigned char r3;
+
+ spin_lock(&up->port.lock);
+ r3 = read_zsreg(channel, R3);
+
+ /* Channel A */
+ tty = NULL;
+ if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+ writeb(RES_H_IUS, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ if (r3 & CHARxIP)
+ tty = sunzilog_receive_chars(up, channel);
+ if (r3 & CHAEXT)
+ sunzilog_status_handle(up, channel);
+ if (r3 & CHATxIP)
+ sunzilog_transmit_chars(up, channel);
+ }
+ spin_unlock(&up->port.lock);
+
+ if (tty)
+ tty_flip_buffer_push(tty);
+
+ /* Channel B */
+ up = up->next;
+ channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+ spin_lock(&up->port.lock);
+ tty = NULL;
+ if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+ writeb(RES_H_IUS, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ if (r3 & CHBRxIP)
+ tty = sunzilog_receive_chars(up, channel);
+ if (r3 & CHBEXT)
+ sunzilog_status_handle(up, channel);
+ if (r3 & CHBTxIP)
+ sunzilog_transmit_chars(up, channel);
+ }
+ spin_unlock(&up->port.lock);
+
+ if (tty)
+ tty_flip_buffer_push(tty);
+
+ up = up->next;
+ }
+
+ return IRQ_HANDLED;
+}
+
+/* A convenient way to quickly get R0 status. The caller must _not_ hold the
+ * port lock, it is acquired here.
+ */
+static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
+{
+ struct zilog_channel __iomem *channel;
+ unsigned char status;
+
+ channel = ZILOG_CHANNEL_FROM_PORT(port);
+ status = readb(&channel->control);
+ ZSDELAY();
+
+ return status;
+}
+
+/* The port lock is not held. */
+static unsigned int sunzilog_tx_empty(struct uart_port *port)
+{
+ unsigned long flags;
+ unsigned char status;
+ unsigned int ret;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ status = sunzilog_read_channel_status(port);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (status & Tx_BUF_EMP)
+ ret = TIOCSER_TEMT;
+ else
+ ret = 0;
+
+ return ret;
+}
+
+/* The port lock is held and interrupts are disabled. */
+static unsigned int sunzilog_get_mctrl(struct uart_port *port)
+{
+ unsigned char status;
+ unsigned int ret;
+
+ status = sunzilog_read_channel_status(port);
+
+ ret = 0;
+ if (status & DCD)
+ ret |= TIOCM_CAR;
+ if (status & SYNC)
+ ret |= TIOCM_DSR;
+ if (status & CTS)
+ ret |= TIOCM_CTS;
+
+ return ret;
+}
+
+/* The port lock is held and interrupts are disabled. */
+static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+ unsigned char set_bits, clear_bits;
+
+ set_bits = clear_bits = 0;
+
+ 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. */
+ up->curregs[R5] |= set_bits;
+ up->curregs[R5] &= ~clear_bits;
+ write_zsreg(channel, R5, up->curregs[R5]);
+}
+
+/* The port lock is held and interrupts are disabled. */
+static void sunzilog_stop_tx(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+
+ up->flags |= SUNZILOG_FLAG_TX_STOPPED;
+}
+
+/* The port lock is held and interrupts are disabled. */
+static void sunzilog_start_tx(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+ unsigned char status;
+
+ up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+ up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
+
+ status = readb(&channel->control);
+ ZSDELAY();
+
+ /* 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) {
+ writeb(port->x_char, &channel->data);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ port->icount.tx++;
+ port->x_char = 0;
+ } else {
+ struct circ_buf *xmit = &port->state->xmit;
+
+ writeb(xmit->buf[xmit->tail], &channel->data);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&up->port);
+ }
+}
+
+/* The port lock is held. */
+static void sunzilog_stop_rx(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = UART_ZILOG(port);
+ struct zilog_channel __iomem *channel;
+
+ if (ZS_IS_CONS(up))
+ return;
+
+ channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+ /* Disable all RX interrupts. */
+ up->curregs[R1] &= ~RxINT_MASK;
+ sunzilog_maybe_update_regs(up, channel);
+}
+
+/* The port lock is held. */
+static void sunzilog_enable_ms(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+ unsigned char new_reg;
+
+ new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
+ if (new_reg != up->curregs[R15]) {
+ up->curregs[R15] = new_reg;
+
+ /* NOTE: Not subject to 'transmitter active' rule. */
+ write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
+ }
+}
+
+/* The port lock is not held. */
+static void sunzilog_break_ctl(struct uart_port *port, int break_state)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+ unsigned char set_bits, clear_bits, new_reg;
+ unsigned long flags;
+
+ 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 = (up->curregs[R5] | set_bits) & ~clear_bits;
+ if (new_reg != up->curregs[R5]) {
+ up->curregs[R5] = new_reg;
+
+ /* NOTE: Not subject to 'transmitter active' rule. */
+ write_zsreg(channel, R5, up->curregs[R5]);
+ }
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void __sunzilog_startup(struct uart_sunzilog_port *up)
+{
+ struct zilog_channel __iomem *channel;
+
+ channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+ up->prev_status = readb(&channel->control);
+
+ /* Enable receiver and transmitter. */
+ up->curregs[R3] |= RxENAB;
+ up->curregs[R5] |= TxENAB;
+
+ up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+ sunzilog_maybe_update_regs(up, channel);
+}
+
+static int sunzilog_startup(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = UART_ZILOG(port);
+ unsigned long flags;
+
+ if (ZS_IS_CONS(up))
+ return 0;
+
+ spin_lock_irqsave(&port->lock, flags);
+ __sunzilog_startup(up);
+ spin_unlock_irqrestore(&port->lock, flags);
+ return 0;
+}
+
+/*
+ * The test for ZS_IS_CONS is explained by the following e-mail:
+ *****
+ * From: Russell King <rmk@arm.linux.org.uk>
+ * Date: Sun, 8 Dec 2002 10:18:38 +0000
+ *
+ * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
+ * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
+ * > and I noticed that something is not right with reference
+ * > counting in this case. It seems that when the console
+ * > is open by kernel initially, this is not accounted
+ * > as an open, and uart_startup is not called.
+ *
+ * That is correct. We are unable to call uart_startup when the serial
+ * console is initialised because it may need to allocate memory (as
+ * request_irq does) and the memory allocators may not have been
+ * initialised.
+ *
+ * 1. initialise the port into a state where it can send characters in the
+ * console write method.
+ *
+ * 2. don't do the actual hardware shutdown in your shutdown() method (but
+ * do the normal software shutdown - ie, free irqs etc)
+ *****
+ */
+static void sunzilog_shutdown(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = UART_ZILOG(port);
+ struct zilog_channel __iomem *channel;
+ unsigned long flags;
+
+ if (ZS_IS_CONS(up))
+ return;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+ /* Disable receiver and transmitter. */
+ up->curregs[R3] &= ~RxENAB;
+ up->curregs[R5] &= ~TxENAB;
+
+ /* Disable all interrupts and BRK assertion. */
+ up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+ up->curregs[R5] &= ~SND_BRK;
+ sunzilog_maybe_update_regs(up, channel);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* Shared by TTY driver and serial console setup. The port lock is held
+ * and local interrupts are disabled.
+ */
+static void
+sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
+ unsigned int iflag, int brg)
+{
+
+ up->curregs[R10] = NRZ;
+ up->curregs[R11] = TCBR | RCBR;
+
+ /* Program BAUD and clock source. */
+ up->curregs[R4] &= ~XCLK_MASK;
+ up->curregs[R4] |= X16CLK;
+ up->curregs[R12] = brg & 0xff;
+ up->curregs[R13] = (brg >> 8) & 0xff;
+ up->curregs[R14] = BRSRC | BRENAB;
+
+ /* Character size, stop bits, and parity. */
+ up->curregs[R3] &= ~RxN_MASK;
+ up->curregs[R5] &= ~TxN_MASK;
+ switch (cflag & CSIZE) {
+ case CS5:
+ up->curregs[R3] |= Rx5;
+ up->curregs[R5] |= Tx5;
+ up->parity_mask = 0x1f;
+ break;
+ case CS6:
+ up->curregs[R3] |= Rx6;
+ up->curregs[R5] |= Tx6;
+ up->parity_mask = 0x3f;
+ break;
+ case CS7:
+ up->curregs[R3] |= Rx7;
+ up->curregs[R5] |= Tx7;
+ up->parity_mask = 0x7f;
+ break;
+ case CS8:
+ default:
+ up->curregs[R3] |= Rx8;
+ up->curregs[R5] |= Tx8;
+ up->parity_mask = 0xff;
+ break;
+ };
+ up->curregs[R4] &= ~0x0c;
+ if (cflag & CSTOPB)
+ up->curregs[R4] |= SB2;
+ else
+ up->curregs[R4] |= SB1;
+ if (cflag & PARENB)
+ up->curregs[R4] |= PAR_ENAB;
+ else
+ up->curregs[R4] &= ~PAR_ENAB;
+ if (!(cflag & PARODD))
+ up->curregs[R4] |= PAR_EVEN;
+ else
+ up->curregs[R4] &= ~PAR_EVEN;
+
+ up->port.read_status_mask = Rx_OVR;
+ if (iflag & INPCK)
+ up->port.read_status_mask |= CRC_ERR | PAR_ERR;
+ if (iflag & (BRKINT | PARMRK))
+ up->port.read_status_mask |= BRK_ABRT;
+
+ up->port.ignore_status_mask = 0;
+ if (iflag & IGNPAR)
+ up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
+ if (iflag & IGNBRK) {
+ up->port.ignore_status_mask |= BRK_ABRT;
+ if (iflag & IGNPAR)
+ up->port.ignore_status_mask |= Rx_OVR;
+ }
+
+ if ((cflag & CREAD) == 0)
+ up->port.ignore_status_mask = 0xff;
+}
+
+/* The port lock is not held. */
+static void
+sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ unsigned long flags;
+ int baud, brg;
+
+ baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
+
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+
+ sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
+
+ if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+ up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
+ else
+ up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
+
+ up->cflag = termios->c_cflag;
+
+ sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
+
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static const char *sunzilog_type(struct uart_port *port)
+{
+ struct uart_sunzilog_port *up = UART_ZILOG(port);
+
+ return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
+}
+
+/* We do not request/release mappings of the registers here, this
+ * happens at early serial probe time.
+ */
+static void sunzilog_release_port(struct uart_port *port)
+{
+}
+
+static int sunzilog_request_port(struct uart_port *port)
+{
+ return 0;
+}
+
+/* These do not need to do anything interesting either. */
+static void sunzilog_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* We do not support letting the user mess with the divisor, IRQ, etc. */
+static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ return -EINVAL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int sunzilog_get_poll_char(struct uart_port *port)
+{
+ unsigned char ch, r1;
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel
+ = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+
+ r1 = read_zsreg(channel, R1);
+ if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+ writeb(ERR_RES, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+ }
+
+ ch = readb(&channel->control);
+ ZSDELAY();
+
+ /* This funny hack depends upon BRK_ABRT not interfering
+ * with the other bits we care about in R1.
+ */
+ if (ch & BRK_ABRT)
+ r1 |= BRK_ABRT;
+
+ if (!(ch & Rx_CH_AV))
+ return NO_POLL_CHAR;
+
+ ch = readb(&channel->data);
+ ZSDELAY();
+
+ ch &= up->parity_mask;
+ return ch;
+}
+
+static void sunzilog_put_poll_char(struct uart_port *port,
+ unsigned char ch)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
+
+ sunzilog_putchar(&up->port, ch);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
+static struct uart_ops sunzilog_pops = {
+ .tx_empty = sunzilog_tx_empty,
+ .set_mctrl = sunzilog_set_mctrl,
+ .get_mctrl = sunzilog_get_mctrl,
+ .stop_tx = sunzilog_stop_tx,
+ .start_tx = sunzilog_start_tx,
+ .stop_rx = sunzilog_stop_rx,
+ .enable_ms = sunzilog_enable_ms,
+ .break_ctl = sunzilog_break_ctl,
+ .startup = sunzilog_startup,
+ .shutdown = sunzilog_shutdown,
+ .set_termios = sunzilog_set_termios,
+ .type = sunzilog_type,
+ .release_port = sunzilog_release_port,
+ .request_port = sunzilog_request_port,
+ .config_port = sunzilog_config_port,
+ .verify_port = sunzilog_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = sunzilog_get_poll_char,
+ .poll_put_char = sunzilog_put_poll_char,
+#endif
+};
+
+static int uart_chip_count;
+static struct uart_sunzilog_port *sunzilog_port_table;
+static struct zilog_layout __iomem **sunzilog_chip_regs;
+
+static struct uart_sunzilog_port *sunzilog_irq_chain;
+
+static struct uart_driver sunzilog_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = "sunzilog",
+ .dev_name = "ttyS",
+ .major = TTY_MAJOR,
+};
+
+static int __init sunzilog_alloc_tables(int num_sunzilog)
+{
+ struct uart_sunzilog_port *up;
+ unsigned long size;
+ int num_channels = num_sunzilog * 2;
+ int i;
+
+ size = num_channels * sizeof(struct uart_sunzilog_port);
+ sunzilog_port_table = kzalloc(size, GFP_KERNEL);
+ if (!sunzilog_port_table)
+ return -ENOMEM;
+
+ for (i = 0; i < num_channels; i++) {
+ up = &sunzilog_port_table[i];
+
+ spin_lock_init(&up->port.lock);
+
+ if (i == 0)
+ sunzilog_irq_chain = up;
+
+ if (i < num_channels - 1)
+ up->next = up + 1;
+ else
+ up->next = NULL;
+ }
+
+ size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
+ sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
+ if (!sunzilog_chip_regs) {
+ kfree(sunzilog_port_table);
+ sunzilog_irq_chain = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void sunzilog_free_tables(void)
+{
+ kfree(sunzilog_port_table);
+ sunzilog_irq_chain = NULL;
+ kfree(sunzilog_chip_regs);
+}
+
+#define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
+
+static void sunzilog_putchar(struct uart_port *port, int ch)
+{
+ struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+ int loops = ZS_PUT_CHAR_MAX_DELAY;
+
+ /* This is a timed polling loop so do not switch the explicit
+ * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
+ */
+ do {
+ unsigned char val = readb(&channel->control);
+ if (val & Tx_BUF_EMP) {
+ ZSDELAY();
+ break;
+ }
+ udelay(5);
+ } while (--loops);
+
+ writeb(ch, &channel->data);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+}
+
+#ifdef CONFIG_SERIO
+
+static DEFINE_SPINLOCK(sunzilog_serio_lock);
+
+static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
+{
+ struct uart_sunzilog_port *up = serio->port_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sunzilog_serio_lock, flags);
+
+ sunzilog_putchar(&up->port, ch);
+
+ spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+
+ return 0;
+}
+
+static int sunzilog_serio_open(struct serio *serio)
+{
+ struct uart_sunzilog_port *up = serio->port_data;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&sunzilog_serio_lock, flags);
+ if (!up->serio_open) {
+ up->serio_open = 1;
+ ret = 0;
+ } else
+ ret = -EBUSY;
+ spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+
+ return ret;
+}
+
+static void sunzilog_serio_close(struct serio *serio)
+{
+ struct uart_sunzilog_port *up = serio->port_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sunzilog_serio_lock, flags);
+ up->serio_open = 0;
+ spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+}
+
+#endif /* CONFIG_SERIO */
+
+#ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
+static void
+sunzilog_console_write(struct console *con, const char *s, unsigned int count)
+{
+ struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
+ unsigned long flags;
+ int locked = 1;
+
+ local_irq_save(flags);
+ if (up->port.sysrq) {
+ locked = 0;
+ } else if (oops_in_progress) {
+ locked = spin_trylock(&up->port.lock);
+ } else
+ spin_lock(&up->port.lock);
+
+ uart_console_write(&up->port, s, count, sunzilog_putchar);
+ udelay(2);
+
+ if (locked)
+ spin_unlock(&up->port.lock);
+ local_irq_restore(flags);
+}
+
+static int __init sunzilog_console_setup(struct console *con, char *options)
+{
+ struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
+ unsigned long flags;
+ int baud, brg;
+
+ if (up->port.type != PORT_SUNZILOG)
+ return -1;
+
+ printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
+ (sunzilog_reg.minor - 64) + con->index, con->index);
+
+ /* Get firmware console settings. */
+ sunserial_console_termios(con, up->port.dev->of_node);
+
+ /* Firmware console speed is limited to 150-->38400 baud so
+ * this hackish cflag thing is OK.
+ */
+ switch (con->cflag & CBAUD) {
+ case B150: baud = 150; break;
+ case B300: baud = 300; break;
+ case B600: baud = 600; break;
+ case B1200: baud = 1200; break;
+ case B2400: baud = 2400; break;
+ case B4800: baud = 4800; break;
+ default: case B9600: baud = 9600; break;
+ case B19200: baud = 19200; break;
+ case B38400: baud = 38400; break;
+ };
+
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ up->curregs[R15] |= BRKIE;
+ sunzilog_convert_to_zs(up, con->cflag, 0, brg);
+
+ sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
+ __sunzilog_startup(up);
+
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+ return 0;
+}
+
+static struct console sunzilog_console_ops = {
+ .name = "ttyS",
+ .write = sunzilog_console_write,
+ .device = uart_console_device,
+ .setup = sunzilog_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &sunzilog_reg,
+};
+
+static inline struct console *SUNZILOG_CONSOLE(void)
+{
+ return &sunzilog_console_ops;
+}
+
+#else
+#define SUNZILOG_CONSOLE() (NULL)
+#endif
+
+static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up)
+{
+ int baud, brg;
+
+ if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
+ up->cflag = B1200 | CS8 | CLOCAL | CREAD;
+ baud = 1200;
+ } else {
+ up->cflag = B4800 | CS8 | CLOCAL | CREAD;
+ baud = 4800;
+ }
+
+ up->curregs[R15] |= BRKIE;
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+ sunzilog_convert_to_zs(up, up->cflag, 0, brg);
+ sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
+ __sunzilog_startup(up);
+}
+
+#ifdef CONFIG_SERIO
+static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
+{
+ struct serio *serio = &up->serio;
+
+ serio->port_data = up;
+
+ serio->id.type = SERIO_RS232;
+ if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
+ serio->id.proto = SERIO_SUNKBD;
+ strlcpy(serio->name, "zskbd", sizeof(serio->name));
+ } else {
+ serio->id.proto = SERIO_SUN;
+ serio->id.extra = 1;
+ strlcpy(serio->name, "zsms", sizeof(serio->name));
+ }
+ strlcpy(serio->phys,
+ ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
+ "zs/serio0" : "zs/serio1"),
+ sizeof(serio->phys));
+
+ serio->write = sunzilog_serio_write;
+ serio->open = sunzilog_serio_open;
+ serio->close = sunzilog_serio_close;
+ serio->dev.parent = up->port.dev;
+
+ serio_register_port(serio);
+}
+#endif
+
+static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
+{
+ struct zilog_channel __iomem *channel;
+ unsigned long flags;
+ int baud, brg;
+
+ channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ if (ZS_IS_CHANNEL_A(up)) {
+ write_zsreg(channel, R9, FHWRES);
+ ZSDELAY_LONG();
+ (void) read_zsreg(channel, R0);
+ }
+
+ if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
+ SUNZILOG_FLAG_CONS_MOUSE)) {
+ up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+ up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+ up->curregs[R3] = RxENAB | Rx8;
+ up->curregs[R5] = TxENAB | Tx8;
+ up->curregs[R6] = 0x00; /* SDLC Address */
+ up->curregs[R7] = 0x7E; /* SDLC Flag */
+ up->curregs[R9] = NV;
+ up->curregs[R7p] = 0x00;
+ sunzilog_init_kbdms(up);
+ /* Only enable interrupts if an ISR handler available */
+ if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
+ up->curregs[R9] |= MIE;
+ write_zsreg(channel, R9, up->curregs[R9]);
+ } else {
+ /* Normal serial TTY. */
+ up->parity_mask = 0xff;
+ up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+ up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+ up->curregs[R3] = RxENAB | Rx8;
+ up->curregs[R5] = TxENAB | Tx8;
+ up->curregs[R6] = 0x00; /* SDLC Address */
+ up->curregs[R7] = 0x7E; /* SDLC Flag */
+ up->curregs[R9] = NV;
+ up->curregs[R10] = NRZ;
+ up->curregs[R11] = TCBR | RCBR;
+ baud = 9600;
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+ up->curregs[R12] = (brg & 0xff);
+ up->curregs[R13] = (brg >> 8) & 0xff;
+ up->curregs[R14] = BRSRC | BRENAB;
+ up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
+ up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
+ if (__load_zsregs(channel, up->curregs)) {
+ up->flags |= SUNZILOG_FLAG_ESCC;
+ }
+ /* Only enable interrupts if an ISR handler available */
+ if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
+ up->curregs[R9] |= MIE;
+ write_zsreg(channel, R9, up->curregs[R9]);
+ }
+
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+#ifdef CONFIG_SERIO
+ if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
+ SUNZILOG_FLAG_CONS_MOUSE))
+ sunzilog_register_serio(up);
+#endif
+}
+
+static int zilog_irq = -1;
+
+static int __devinit zs_probe(struct platform_device *op, const struct of_device_id *match)
+{
+ static int kbm_inst, uart_inst;
+ int inst;
+ struct uart_sunzilog_port *up;
+ struct zilog_layout __iomem *rp;
+ int keyboard_mouse = 0;
+ int err;
+
+ if (of_find_property(op->dev.of_node, "keyboard", NULL))
+ keyboard_mouse = 1;
+
+ /* uarts must come before keyboards/mice */
+ if (keyboard_mouse)
+ inst = uart_chip_count + kbm_inst;
+ else
+ inst = uart_inst;
+
+ sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
+ sizeof(struct zilog_layout),
+ "zs");
+ if (!sunzilog_chip_regs[inst])
+ return -ENOMEM;
+
+ rp = sunzilog_chip_regs[inst];
+
+ if (zilog_irq == -1)
+ zilog_irq = op->archdata.irqs[0];
+
+ up = &sunzilog_port_table[inst * 2];
+
+ /* Channel A */
+ up[0].port.mapbase = op->resource[0].start + 0x00;
+ up[0].port.membase = (void __iomem *) &rp->channelA;
+ up[0].port.iotype = UPIO_MEM;
+ up[0].port.irq = op->archdata.irqs[0];
+ up[0].port.uartclk = ZS_CLOCK;
+ up[0].port.fifosize = 1;
+ up[0].port.ops = &sunzilog_pops;
+ up[0].port.type = PORT_SUNZILOG;
+ up[0].port.flags = 0;
+ up[0].port.line = (inst * 2) + 0;
+ up[0].port.dev = &op->dev;
+ up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
+ if (keyboard_mouse)
+ up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
+ sunzilog_init_hw(&up[0]);
+
+ /* Channel B */
+ up[1].port.mapbase = op->resource[0].start + 0x04;
+ up[1].port.membase = (void __iomem *) &rp->channelB;
+ up[1].port.iotype = UPIO_MEM;
+ up[1].port.irq = op->archdata.irqs[0];
+ up[1].port.uartclk = ZS_CLOCK;
+ up[1].port.fifosize = 1;
+ up[1].port.ops = &sunzilog_pops;
+ up[1].port.type = PORT_SUNZILOG;
+ up[1].port.flags = 0;
+ up[1].port.line = (inst * 2) + 1;
+ up[1].port.dev = &op->dev;
+ up[1].flags |= 0;
+ if (keyboard_mouse)
+ up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
+ sunzilog_init_hw(&up[1]);
+
+ if (!keyboard_mouse) {
+ if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
+ &sunzilog_reg, up[0].port.line,
+ false))
+ up->flags |= SUNZILOG_FLAG_IS_CONS;
+ err = uart_add_one_port(&sunzilog_reg, &up[0].port);
+ if (err) {
+ of_iounmap(&op->resource[0],
+ rp, sizeof(struct zilog_layout));
+ return err;
+ }
+ if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
+ &sunzilog_reg, up[1].port.line,
+ false))
+ up->flags |= SUNZILOG_FLAG_IS_CONS;
+ err = uart_add_one_port(&sunzilog_reg, &up[1].port);
+ if (err) {
+ uart_remove_one_port(&sunzilog_reg, &up[0].port);
+ of_iounmap(&op->resource[0],
+ rp, sizeof(struct zilog_layout));
+ return err;
+ }
+ uart_inst++;
+ } else {
+ printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
+ "is a %s\n",
+ dev_name(&op->dev),
+ (unsigned long long) up[0].port.mapbase,
+ op->archdata.irqs[0], sunzilog_type(&up[0].port));
+ printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
+ "is a %s\n",
+ dev_name(&op->dev),
+ (unsigned long long) up[1].port.mapbase,
+ op->archdata.irqs[0], sunzilog_type(&up[1].port));
+ kbm_inst++;
+ }
+
+ dev_set_drvdata(&op->dev, &up[0]);
+
+ return 0;
+}
+
+static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
+{
+ if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
+#ifdef CONFIG_SERIO
+ serio_unregister_port(&up->serio);
+#endif
+ } else
+ uart_remove_one_port(&sunzilog_reg, &up->port);
+}
+
+static int __devexit zs_remove(struct platform_device *op)
+{
+ struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
+ struct zilog_layout __iomem *regs;
+
+ zs_remove_one(&up[0]);
+ zs_remove_one(&up[1]);
+
+ regs = sunzilog_chip_regs[up[0].port.line / 2];
+ of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
+
+ dev_set_drvdata(&op->dev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id zs_match[] = {
+ {
+ .name = "zs",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, zs_match);
+
+static struct of_platform_driver zs_driver = {
+ .driver = {
+ .name = "zs",
+ .owner = THIS_MODULE,
+ .of_match_table = zs_match,
+ },
+ .probe = zs_probe,
+ .remove = __devexit_p(zs_remove),
+};
+
+static int __init sunzilog_init(void)
+{
+ struct device_node *dp;
+ int err;
+ int num_keybms = 0;
+ int num_sunzilog = 0;
+
+ for_each_node_by_name(dp, "zs") {
+ num_sunzilog++;
+ if (of_find_property(dp, "keyboard", NULL))
+ num_keybms++;
+ }
+
+ if (num_sunzilog) {
+ err = sunzilog_alloc_tables(num_sunzilog);
+ if (err)
+ goto out;
+
+ uart_chip_count = num_sunzilog - num_keybms;
+
+ err = sunserial_register_minors(&sunzilog_reg,
+ uart_chip_count * 2);
+ if (err)
+ goto out_free_tables;
+ }
+
+ err = of_register_platform_driver(&zs_driver);
+ if (err)
+ goto out_unregister_uart;
+
+ if (zilog_irq != -1) {
+ struct uart_sunzilog_port *up = sunzilog_irq_chain;
+ err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
+ "zs", sunzilog_irq_chain);
+ if (err)
+ goto out_unregister_driver;
+
+ /* Enable Interrupts */
+ while (up) {
+ struct zilog_channel __iomem *channel;
+
+ /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
+ channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+ up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
+ up->curregs[R9] |= MIE;
+ write_zsreg(channel, R9, up->curregs[R9]);
+ up = up->next;
+ }
+ }
+
+out:
+ return err;
+
+out_unregister_driver:
+ of_unregister_platform_driver(&zs_driver);
+
+out_unregister_uart:
+ if (num_sunzilog) {
+ sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
+ sunzilog_reg.cons = NULL;
+ }
+
+out_free_tables:
+ sunzilog_free_tables();
+ goto out;
+}
+
+static void __exit sunzilog_exit(void)
+{
+ of_unregister_platform_driver(&zs_driver);
+
+ if (zilog_irq != -1) {
+ struct uart_sunzilog_port *up = sunzilog_irq_chain;
+
+ /* Disable Interrupts */
+ while (up) {
+ struct zilog_channel __iomem *channel;
+
+ /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
+ channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+ up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
+ up->curregs[R9] &= ~MIE;
+ write_zsreg(channel, R9, up->curregs[R9]);
+ up = up->next;
+ }
+
+ free_irq(zilog_irq, sunzilog_irq_chain);
+ zilog_irq = -1;
+ }
+
+ if (sunzilog_reg.nr) {
+ sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
+ sunzilog_free_tables();
+ }
+}
+
+module_init(sunzilog_init);
+module_exit(sunzilog_exit);
+
+MODULE_AUTHOR("David S. Miller");
+MODULE_DESCRIPTION("Sun Zilog serial port driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");
--
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