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linux_dsm_epyc7002/drivers/tty/serial/pmac_zilog.c
Dmitry Safonov f5e95c4fe4 tty/serial: Migrate pmac_zilog to use has_sysrq 
The SUPPORT_SYSRQ ifdeffery is not nice as:
- May create misunderstanding about sizeof(struct uart_port) between
  different objects
- Prevents moving functions from serial_core.h
- Reduces readability (well, it's ifdeffery - it's hard to follow)

In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added.
Initialise it in driver's probe and remove ifdeffery.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20191213000657.931618-32-dima@arista.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-18 15:04:56 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* 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...
*
* 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/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/adb.h>
#include <linux/pmu.h>
#include <linux/bitops.h>
#include <linux/sysrq.h>
#include <linux/mutex.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>
#include <asm/macio.h>
#else
#include <linux/platform_device.h>
#define of_machine_is_compatible(x) (0)
#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 Mac and PowerMac serial ports.");
MODULE_LICENSE("GPL");
#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
#define PMACZILOG_MAJOR TTY_MAJOR
#define PMACZILOG_MINOR 64
#define PMACZILOG_NAME "ttyS"
#else
#define PMACZILOG_MAJOR 204
#define PMACZILOG_MINOR 192
#define PMACZILOG_NAME "ttyPZ"
#endif
#define pmz_debug(fmt, arg...) pr_debug("ttyPZ%d: " fmt, uap->port.line, ## arg)
#define pmz_error(fmt, arg...) pr_err("ttyPZ%d: " fmt, uap->port.line, ## arg)
#define pmz_info(fmt, arg...) pr_info("ttyPZ%d: " fmt, uap->port.line, ## 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 struct uart_driver pmz_uart_reg = {
.owner = THIS_MODULE,
.driver_name = PMACZILOG_NAME,
.dev_name = PMACZILOG_NAME,
.major = PMACZILOG_MAJOR,
.minor = PMACZILOG_MINOR,
};
/*
* 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;
/* 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 void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
{
if (enable) {
uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB;
if (!ZS_IS_EXTCLK(uap))
uap->curregs[1] |= EXT_INT_ENAB;
} else {
uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
}
write_zsreg(uap, R1, uap->curregs[1]);
}
static bool pmz_receive_chars(struct uart_pmac_port *uap)
{
struct tty_port *port;
unsigned char ch, r1, drop, flag;
int loops = 0;
/* Sanity check, make sure the old bug is no longer happening */
if (uap->port.state == NULL) {
WARN_ON(1);
(void)read_zsdata(uap);
return false;
}
port = &uap->port.state->port;
while (1) {
drop = 0;
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);
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;
flag = TTY_NORMAL;
uap->port.icount.rx++;
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
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)
flag = TTY_BREAK;
else if (r1 & PAR_ERR)
flag = TTY_PARITY;
else if (r1 & CRC_ERR)
flag = TTY_FRAME;
}
if (uap->port.ignore_status_mask == 0xff ||
(r1 & uap->port.ignore_status_mask) == 0) {
tty_insert_flip_char(port, ch, flag);
}
if (r1 & Rx_OVR)
tty_insert_flip_char(port, 0, TTY_OVERRUN);
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 strange is going on with the HW
*/
if ((++loops) > 1000)
goto flood;
ch = read_zsreg(uap, R0);
if (!(ch & Rx_CH_AV))
break;
}
return true;
flood:
pmz_interrupt_control(uap, 0);
pmz_error("pmz: rx irq flood !\n");
return true;
}
static void pmz_status_handle(struct uart_pmac_port *uap)
{
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.state->port.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_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 becoming 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;
}
/* Under some circumstances, we see interrupts reported for
* a closed channel. The interrupt mask in R1 is clear, but
* R3 still signals the interrupts and we see them when taking
* an interrupt for the other channel (this could be a qemu
* bug but since the ESCC doc doesn't specify precsiely whether
* R3 interrup status bits are masked by R1 interrupt enable
* bits, better safe than sorry). --BenH.
*/
if (!ZS_IS_OPEN(uap))
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.state == NULL)
goto ack_tx_int;
xmit = &uap->port.state->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 uart_pmac_port *uap = dev_id;
struct uart_pmac_port *uap_a;
struct uart_pmac_port *uap_b;
int rc = IRQ_NONE;
bool push;
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 */
push = false;
if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
if (!ZS_IS_OPEN(uap_a)) {
pmz_debug("ChanA interrupt while not open !\n");
goto skip_a;
}
write_zsreg(uap_a, R0, RES_H_IUS);
zssync(uap_a);
if (r3 & CHAEXT)
pmz_status_handle(uap_a);
if (r3 & CHARxIP)
push = pmz_receive_chars(uap_a);
if (r3 & CHATxIP)
pmz_transmit_chars(uap_a);
rc = IRQ_HANDLED;
}
skip_a:
spin_unlock(&uap_a->port.lock);
if (push)
tty_flip_buffer_push(&uap->port.state->port);
if (!uap_b)
goto out;
spin_lock(&uap_b->port.lock);
push = false;
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
if (!ZS_IS_OPEN(uap_b)) {
pmz_debug("ChanB interrupt while not open !\n");
goto skip_b;
}
write_zsreg(uap_b, R0, RES_H_IUS);
zssync(uap_b);
if (r3 & CHBEXT)
pmz_status_handle(uap_b);
if (r3 & CHBRxIP)
push = pmz_receive_chars(uap_b);
if (r3 & CHBTxIP)
pmz_transmit_chars(uap_b);
rc = IRQ_HANDLED;
}
skip_b:
spin_unlock(&uap_b->port.lock);
if (push)
tty_flip_buffer_push(&uap->port.state->port);
out:
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)
{
unsigned char status;
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_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;
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 held and interrupts are disabled.
*/
static unsigned int pmz_get_mctrl(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char status;
unsigned int ret;
status = read_zsreg(uap, R0);
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.
* The port lock is held and interrupts are disabled.
*/
static void pmz_stop_tx(struct uart_port *port)
{
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)
{
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;
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->state->xmit;
if (uart_circ_empty(xmit))
goto out;
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);
}
out:
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);
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))
return;
new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
if (new_reg != uap->curregs[R15]) {
uap->curregs[R15] = new_reg;
/* 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;
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;
write_zsreg(uap, R5, uap->curregs[R5]);
}
spin_unlock_irqrestore(&port->lock, flags);
}
#ifdef CONFIG_PPC_PMAC
/*
* 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;
}
#else
static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
{
return 0;
}
#endif /* !CONFIG_PPC_PMAC */
/*
* FixZeroBug....Works around a bug in the SCC receiving 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)
{
unsigned long flags;
spin_lock_irqsave(&uap->port.lock, flags);
uap->curregs[R5] |= DTR;
write_zsreg(uap, R5, uap->curregs[R5]);
zssync(uap);
spin_unlock_irqrestore(&uap->port.lock, flags);
msleep(110);
spin_lock_irqsave(&uap->port.lock, flags);
uap->curregs[R5] &= ~DTR;
write_zsreg(uap, R5, uap->curregs[R5]);
zssync(uap);
spin_unlock_irqrestore(&uap->port.lock, flags);
msleep(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");
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);
}
sprintf(uap->irq_name, PMACZILOG_NAME"%d", uap->port.line);
if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
uap->irq_name, uap)) {
pmz_error("Unable to register zs interrupt handler.\n");
pmz_set_scc_power(uap, 0);
return -ENXIO;
}
/* 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 interrupt requests for the channel */
spin_lock_irqsave(&port->lock, flags);
pmz_interrupt_control(uap, 1);
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");
spin_lock_irqsave(&port->lock, flags);
/* Disable interrupt requests for the channel */
pmz_interrupt_control(uap, 0);
if (!ZS_IS_CONS(uap)) {
/* Disable receiver and transmitter */
uap->curregs[R3] &= ~RxENABLE;
uap->curregs[R5] &= ~TxENABLE;
/* Disable break assertion */
uap->curregs[R5] &= ~SND_BRK;
pmz_maybe_update_regs(uap);
}
spin_unlock_irqrestore(&port->lock, flags);
/* Release interrupt handler */
free_irq(uap->port.irq, uap);
spin_lock_irqsave(&port->lock, flags);
uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
if (!ZS_IS_CONS(uap))
pmz_set_scc_power(uap, 0); /* Shut the chip down */
spin_unlock_irqrestore(&port->lock, flags);
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 & (IGNBRK | 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) {
pmz_error("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) {
pmz_error("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) {
pmz_error("irda_setup timed out on get_version byte\n");
goto out;
}
udelay(10);
}
version = read_zsdata(uap);
if (version < 4) {
pmz_info("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) {
pmz_error("irda_setup timed out on speed mode byte\n");
goto out;
}
udelay(10);
}
t = read_zsdata(uap);
if (t != cmdbyte)
pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
pmz_info("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 ktermios *termios,
struct ktermios *old)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long baud;
pmz_debug("pmz: set_termios()\n");
memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
/* 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 ktermios *termios,
struct ktermios *old)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* Disable IRQs on the port */
pmz_interrupt_control(uap, 0);
/* Setup new port configuration */
__pmz_set_termios(port, termios, old);
/* Re-enable IRQs on the port */
if (ZS_IS_OPEN(uap))
pmz_interrupt_control(uap, 1);
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;
}
#ifdef CONFIG_CONSOLE_POLL
static int pmz_poll_get_char(struct uart_port *port)
{
struct uart_pmac_port *uap =
container_of(port, struct uart_pmac_port, port);
int tries = 2;
while (tries) {
if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
return read_zsdata(uap);
if (tries--)
udelay(5);
}
return NO_POLL_CHAR;
}
static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
{
struct uart_pmac_port *uap =
container_of(port, struct uart_pmac_port, port);
/* Wait for the transmit buffer to empty. */
while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
udelay(5);
write_zsdata(uap, c);
}
#endif /* CONFIG_CONSOLE_POLL */
static const 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,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = pmz_poll_get_char,
.poll_put_char = pmz_poll_put_char,
#endif
};
#ifdef CONFIG_PPC_PMAC
/*
* 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;
const char *conn;
const struct slot_names_prop {
int count;
char name[1];
} *slots;
int len;
struct resource r_ports, r_rxdma, r_txdma;
/*
* Request & map chip registers
*/
if (of_address_to_resource(np, 0, &r_ports))
return -ENODEV;
uap->port.mapbase = r_ports.start;
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 (of_address_to_resource(np, 1, &r_txdma) == 0 &&
of_address_to_resource(np, 2, &r_rxdma) == 0)
uap->flags |= PMACZILOG_FLAG_HAS_DMA;
#else
memset(&r_txdma, 0, sizeof(struct resource));
memset(&r_rxdma, 0, sizeof(struct resource));
#endif
if (ZS_HAS_DMA(uap)) {
uap->tx_dma_regs = ioremap(r_txdma.start, 0x100);
if (uap->tx_dma_regs == NULL) {
uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
goto no_dma;
}
uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100);
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 = irq_of_parse_and_map(np, 1);
uap->rx_dma_irq = irq_of_parse_and_map(np, 2);
}
no_dma:
/*
* Detect port type
*/
if (of_device_is_compatible(np, "cobalt"))
uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
conn = of_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 = of_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 =
of_find_node_by_name(NULL, "i2c-modem");
if (i2c_modem) {
const char* mid =
of_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);
of_node_put(i2c_modem);
} else {
printk(KERN_INFO "pmac_zilog: serial modem detected\n");
}
}
/*
* Init remaining bits of "port" structure
*/
uap->port.iotype = UPIO_MEM;
uap->port.irq = irq_of_parse_and_map(np, 0);
uap->port.uartclk = ZS_CLOCK;
uap->port.fifosize = 1;
uap->port.ops = &pmz_pops;
uap->port.type = PORT_PMAC_ZILOG;
uap->port.flags = 0;
/*
* Fixup for the port on Gatwick for which the device-tree has
* missing interrupts. Normally, the macio_dev would contain
* fixed up interrupt info, but we use the device-tree directly
* here due to early probing so we need the fixup too.
*/
if (uap->port.irq == 0 &&
np->parent && np->parent->parent &&
of_device_is_compatible(np->parent->parent, "gatwick")) {
/* IRQs on gatwick are offset by 64 */
uap->port.irq = irq_create_mapping(NULL, 64 + 15);
uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4);
uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5);
}
/* 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 device-tree.
*/
static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
{
struct uart_pmac_port *uap;
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.dev.of_node)
break;
if (i >= MAX_ZS_PORTS)
return -ENODEV;
uap = &pmz_ports[i];
uap->dev = mdev;
uap->port.dev = &mdev->ofdev.dev;
dev_set_drvdata(&mdev->ofdev.dev, uap);
/* We still activate the port even when failing to request resources
* to work around bugs in ancient Apple device-trees
*/
if (macio_request_resources(uap->dev, "pmac_zilog"))
printk(KERN_WARNING "%pOFn: Failed to request resource"
", port still active\n",
uap->node);
else
uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
return uart_add_one_port(&pmz_uart_reg, &uap->port);
}
/*
* 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;
uart_remove_one_port(&pmz_uart_reg, &uap->port);
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;
uap->port.dev = NULL;
return 0;
}
static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
{
struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
if (uap == NULL) {
printk("HRM... pmz_suspend with NULL uap\n");
return 0;
}
uart_suspend_port(&pmz_uart_reg, &uap->port);
return 0;
}
static int pmz_resume(struct macio_dev *mdev)
{
struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
if (uap == NULL)
return 0;
uart_resume_port(&pmz_uart_reg, &uap->port);
return 0;
}
/*
* Probe all ports in the system and build the ports array, we register
* with the serial layer later, so we get a proper struct device which
* allows the tty to attach properly. This is later than it used to be
* but the tty layer really wants it that way.
*/
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
*/
for_each_node_by_name(node_p, "escc") {
/*
* 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 (of_node_name_prefix(np, "ch-a"))
node_a = of_node_get(np);
else if (of_node_name_prefix(np, "ch-b"))
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 %pOF\n",
(!node_a) ? 'a' : 'b', node_p);
continue;
}
/*
* Fill basic fields in the port structures
*/
if (node_b != NULL) {
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));
continue;
}
count += 2;
}
pmz_ports_count = count;
return 0;
}
#else
extern struct platform_device scc_a_pdev, scc_b_pdev;
static int __init pmz_init_port(struct uart_pmac_port *uap)
{
struct resource *r_ports;
int irq;
r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(uap->pdev, 0);
if (!r_ports || irq <= 0)
return -ENODEV;
uap->port.mapbase = r_ports->start;
uap->port.membase = (unsigned char __iomem *) r_ports->start;
uap->port.iotype = UPIO_MEM;
uap->port.irq = irq;
uap->port.uartclk = ZS_CLOCK;
uap->port.fifosize = 1;
uap->port.ops = &pmz_pops;
uap->port.type = PORT_PMAC_ZILOG;
uap->port.flags = 0;
uap->control_reg = uap->port.membase;
uap->data_reg = uap->control_reg + 4;
uap->port_type = 0;
uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PMACZILOG_CONSOLE);
pmz_convert_to_zs(uap, CS8, 0, 9600);
return 0;
}
static int __init pmz_probe(void)
{
int err;
pmz_ports_count = 0;
pmz_ports[0].port.line = 0;
pmz_ports[0].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
pmz_ports[0].pdev = &scc_a_pdev;
err = pmz_init_port(&pmz_ports[0]);
if (err)
return err;
pmz_ports_count++;
pmz_ports[0].mate = &pmz_ports[1];
pmz_ports[1].mate = &pmz_ports[0];
pmz_ports[1].port.line = 1;
pmz_ports[1].flags = 0;
pmz_ports[1].pdev = &scc_b_pdev;
err = pmz_init_port(&pmz_ports[1]);
if (err)
return err;
pmz_ports_count++;
return 0;
}
static void pmz_dispose_port(struct uart_pmac_port *uap)
{
memset(uap, 0, sizeof(struct uart_pmac_port));
}
static int __init pmz_attach(struct platform_device *pdev)
{
struct uart_pmac_port *uap;
int i;
/* Iterate the pmz_ports array to find a matching entry */
for (i = 0; i < pmz_ports_count; i++)
if (pmz_ports[i].pdev == pdev)
break;
if (i >= pmz_ports_count)
return -ENODEV;
uap = &pmz_ports[i];
uap->port.dev = &pdev->dev;
platform_set_drvdata(pdev, uap);
return uart_add_one_port(&pmz_uart_reg, &uap->port);
}
static int __exit pmz_detach(struct platform_device *pdev)
{
struct uart_pmac_port *uap = platform_get_drvdata(pdev);
if (!uap)
return -ENODEV;
uart_remove_one_port(&pmz_uart_reg, &uap->port);
uap->port.dev = NULL;
return 0;
}
#endif /* !CONFIG_PPC_PMAC */
#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 = PMACZILOG_NAME,
.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)
{
pmz_uart_reg.nr = pmz_ports_count;
pmz_uart_reg.cons = PMACZILOG_CONSOLE;
/*
* Register this driver with the serial core
*/
return uart_register_driver(&pmz_uart_reg);
}
#ifdef CONFIG_PPC_PMAC
static const struct of_device_id pmz_match[] =
{
{
.name = "ch-a",
},
{
.name = "ch-b",
},
{},
};
MODULE_DEVICE_TABLE (of, pmz_match);
static struct macio_driver pmz_driver = {
.driver = {
.name = "pmac_zilog",
.owner = THIS_MODULE,
.of_match_table = pmz_match,
},
.probe = pmz_attach,
.remove = pmz_detach,
.suspend = pmz_suspend,
.resume = pmz_resume,
};
#else
static struct platform_driver pmz_driver = {
.remove = __exit_p(pmz_detach),
.driver = {
.name = "scc",
},
};
#endif /* !CONFIG_PPC_PMAC */
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
*/
#ifdef CONFIG_PPC_PMAC
return macio_register_driver(&pmz_driver);
#else
return platform_driver_probe(&pmz_driver, pmz_attach);
#endif
}
static void __exit exit_pmz(void)
{
int i;
#ifdef CONFIG_PPC_PMAC
/* Get rid of macio-driver (detach from macio) */
macio_unregister_driver(&pmz_driver);
#else
platform_driver_unregister(&pmz_driver);
#endif
for (i = 0; i < pmz_ports_count; i++) {
struct uart_pmac_port *uport = &pmz_ports[i];
#ifdef CONFIG_PPC_PMAC
if (uport->node != NULL)
pmz_dispose_port(uport);
#else
if (uport->pdev != NULL)
pmz_dispose_port(uport);
#endif
}
/* Unregister UART driver */
uart_unregister_driver(&pmz_uart_reg);
}
#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
static void pmz_console_putchar(struct uart_port *port, int ch)
{
struct uart_pmac_port *uap =
container_of(port, struct uart_pmac_port, port);
/* Wait for the transmit buffer to empty. */
while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
udelay(5);
write_zsdata(uap, ch);
}
/*
* 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;
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);
uart_console_write(&uap->port, s, count, pmz_console_putchar);
/* 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 (of_machine_is_compatible("RackMac1,1")
|| of_machine_is_compatible("RackMac1,2")
|| of_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];
#ifdef CONFIG_PPC_PMAC
if (uap->node == NULL)
return -ENODEV;
#else
if (uap->pdev == NULL)
return -ENODEV;
#endif
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();
if (pmz_ports_count == 0)
return -ENODEV;
/* 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);
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