IP22ZILOG: fix lockup and sysrq
- fix lockup when switching from early console to real console - make sysrq reliable - fix panic, if sysrq is issued before console is opened Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Bogendoerfer
Linus Torvalds
parent
6d4f5879b6
commit
68576cf122
|
|
@ -31,25 +31,6 @@
|
|||
unsigned long sgi_gfxaddr;
|
||||
EXPORT_SYMBOL_GPL(sgi_gfxaddr);
|
||||
|
||||
/*
|
||||
* Stop-A is originally a Sun thing that isn't standard on IP22 so to avoid
|
||||
* accidents it's disabled by default on IP22.
|
||||
*
|
||||
* FIXME: provide a mechanism to change the value of stop_a_enabled.
|
||||
*/
|
||||
int stop_a_enabled;
|
||||
|
||||
void ip22_do_break(void)
|
||||
{
|
||||
if (!stop_a_enabled)
|
||||
return;
|
||||
|
||||
printk("\n");
|
||||
ArcEnterInteractiveMode();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(ip22_do_break);
|
||||
|
||||
extern void ip22_be_init(void) __init;
|
||||
|
||||
void __init plat_mem_setup(void)
|
||||
|
|
|
|||
|
|
@ -45,8 +45,6 @@
|
|||
|
||||
#include "ip22zilog.h"
|
||||
|
||||
void ip22_do_break(void);
|
||||
|
||||
/*
|
||||
* On IP22 we need to delay after register accesses but we do not need to
|
||||
* flush writes.
|
||||
|
|
@ -81,12 +79,9 @@ struct uart_ip22zilog_port {
|
|||
#define IP22ZILOG_FLAG_REGS_HELD 0x00000040
|
||||
#define IP22ZILOG_FLAG_TX_STOPPED 0x00000080
|
||||
#define IP22ZILOG_FLAG_TX_ACTIVE 0x00000100
|
||||
#define IP22ZILOG_FLAG_RESET_DONE 0x00000200
|
||||
|
||||
unsigned int cflag;
|
||||
|
||||
/* L1-A keyboard break state. */
|
||||
int kbd_id;
|
||||
int l1_down;
|
||||
unsigned int tty_break;
|
||||
|
||||
unsigned char parity_mask;
|
||||
unsigned char prev_status;
|
||||
|
|
@ -250,13 +245,26 @@ static void ip22zilog_maybe_update_regs(struct uart_ip22zilog_port *up,
|
|||
}
|
||||
}
|
||||
|
||||
static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
|
||||
struct zilog_channel *channel)
|
||||
{
|
||||
struct tty_struct *tty = up->port.info->tty; /* XXX info==NULL? */
|
||||
#define Rx_BRK 0x0100 /* BREAK event software flag. */
|
||||
#define Rx_SYS 0x0200 /* SysRq event software flag. */
|
||||
|
||||
while (1) {
|
||||
unsigned char ch, r1, flag;
|
||||
static struct tty_struct *ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
|
||||
struct zilog_channel *channel)
|
||||
{
|
||||
struct tty_struct *tty;
|
||||
unsigned char ch, flag;
|
||||
unsigned int r1;
|
||||
|
||||
tty = NULL;
|
||||
if (up->port.info != NULL &&
|
||||
up->port.info->tty != NULL)
|
||||
tty = up->port.info->tty;
|
||||
|
||||
for (;;) {
|
||||
ch = readb(&channel->control);
|
||||
ZSDELAY();
|
||||
if (!(ch & Rx_CH_AV))
|
||||
break;
|
||||
|
||||
r1 = read_zsreg(channel, R1);
|
||||
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
|
||||
|
|
@ -265,43 +273,26 @@ static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
|
|||
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;
|
||||
|
||||
ch = readb(&channel->data);
|
||||
ZSDELAY();
|
||||
|
||||
ch &= up->parity_mask;
|
||||
|
||||
if (ZS_IS_CONS(up) && (r1 & BRK_ABRT)) {
|
||||
/* Wait for BREAK to deassert to avoid potentially
|
||||
* confusing the PROM.
|
||||
*/
|
||||
while (1) {
|
||||
ch = readb(&channel->control);
|
||||
ZSDELAY();
|
||||
if (!(ch & BRK_ABRT))
|
||||
break;
|
||||
}
|
||||
ip22_do_break();
|
||||
return;
|
||||
}
|
||||
/* Handle the null char got when BREAK is removed. */
|
||||
if (!ch)
|
||||
r1 |= up->tty_break;
|
||||
|
||||
/* 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);
|
||||
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | Rx_SYS | Rx_BRK)) {
|
||||
up->tty_break = 0;
|
||||
|
||||
if (r1 & (Rx_SYS | Rx_BRK)) {
|
||||
up->port.icount.brk++;
|
||||
if (uart_handle_break(&up->port))
|
||||
goto next_char;
|
||||
if (r1 & Rx_SYS)
|
||||
continue;
|
||||
r1 &= ~(PAR_ERR | CRC_ERR);
|
||||
}
|
||||
else if (r1 & PAR_ERR)
|
||||
up->port.icount.parity++;
|
||||
|
|
@ -310,30 +301,21 @@ static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
|
|||
if (r1 & Rx_OVR)
|
||||
up->port.icount.overrun++;
|
||||
r1 &= up->port.read_status_mask;
|
||||
if (r1 & BRK_ABRT)
|
||||
if (r1 & Rx_BRK)
|
||||
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))
|
||||
goto next_char;
|
||||
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);
|
||||
next_char:
|
||||
ch = readb(&channel->control);
|
||||
ZSDELAY();
|
||||
if (!(ch & Rx_CH_AV))
|
||||
break;
|
||||
if (tty)
|
||||
uart_insert_char(&up->port, r1, Rx_OVR, ch, flag);
|
||||
}
|
||||
|
||||
tty_flip_buffer_push(tty);
|
||||
return tty;
|
||||
}
|
||||
|
||||
static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
|
||||
|
|
@ -348,6 +330,15 @@ static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
|
|||
ZSDELAY();
|
||||
ZS_WSYNC(channel);
|
||||
|
||||
if (up->curregs[R15] & BRKIE) {
|
||||
if ((status & BRK_ABRT) && !(up->prev_status & BRK_ABRT)) {
|
||||
if (uart_handle_break(&up->port))
|
||||
up->tty_break = Rx_SYS;
|
||||
else
|
||||
up->tty_break = Rx_BRK;
|
||||
}
|
||||
}
|
||||
|
||||
if (ZS_WANTS_MODEM_STATUS(up)) {
|
||||
if (status & SYNC)
|
||||
up->port.icount.dsr++;
|
||||
|
|
@ -356,10 +347,10 @@ static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
|
|||
* But it does not tell us which bit has changed, we have to keep
|
||||
* track of this ourselves.
|
||||
*/
|
||||
if ((status & DCD) ^ up->prev_status)
|
||||
if ((status ^ up->prev_status) ^ DCD)
|
||||
uart_handle_dcd_change(&up->port,
|
||||
(status & DCD));
|
||||
if ((status & CTS) ^ up->prev_status)
|
||||
if ((status ^ up->prev_status) ^ CTS)
|
||||
uart_handle_cts_change(&up->port,
|
||||
(status & CTS));
|
||||
|
||||
|
|
@ -447,19 +438,21 @@ static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
|
|||
while (up) {
|
||||
struct zilog_channel *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)
|
||||
ip22zilog_receive_chars(up, channel);
|
||||
tty = ip22zilog_receive_chars(up, channel);
|
||||
if (r3 & CHAEXT)
|
||||
ip22zilog_status_handle(up, channel);
|
||||
if (r3 & CHATxIP)
|
||||
|
|
@ -467,18 +460,22 @@ static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
|
|||
}
|
||||
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)
|
||||
ip22zilog_receive_chars(up, channel);
|
||||
tty = ip22zilog_receive_chars(up, channel);
|
||||
if (r3 & CHBEXT)
|
||||
ip22zilog_status_handle(up, channel);
|
||||
if (r3 & CHBTxIP)
|
||||
|
|
@ -486,6 +483,9 @@ static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
|
|||
}
|
||||
spin_unlock(&up->port.lock);
|
||||
|
||||
if (tty)
|
||||
tty_flip_buffer_push(tty);
|
||||
|
||||
up = up->next;
|
||||
}
|
||||
|
||||
|
|
@ -681,11 +681,46 @@ static void ip22zilog_break_ctl(struct uart_port *port, int break_state)
|
|||
spin_unlock_irqrestore(&port->lock, flags);
|
||||
}
|
||||
|
||||
static void __ip22zilog_reset(struct uart_ip22zilog_port *up)
|
||||
{
|
||||
struct zilog_channel *channel;
|
||||
int i;
|
||||
|
||||
if (up->flags & IP22ZILOG_FLAG_RESET_DONE)
|
||||
return;
|
||||
|
||||
/* Let pending transmits finish. */
|
||||
channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
|
||||
for (i = 0; i < 1000; i++) {
|
||||
unsigned char stat = read_zsreg(channel, R1);
|
||||
if (stat & ALL_SNT)
|
||||
break;
|
||||
udelay(100);
|
||||
}
|
||||
|
||||
if (!ZS_IS_CHANNEL_A(up)) {
|
||||
up++;
|
||||
channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
|
||||
}
|
||||
write_zsreg(channel, R9, FHWRES);
|
||||
ZSDELAY_LONG();
|
||||
(void) read_zsreg(channel, R0);
|
||||
|
||||
up->flags |= IP22ZILOG_FLAG_RESET_DONE;
|
||||
up->next->flags |= IP22ZILOG_FLAG_RESET_DONE;
|
||||
}
|
||||
|
||||
static void __ip22zilog_startup(struct uart_ip22zilog_port *up)
|
||||
{
|
||||
struct zilog_channel *channel;
|
||||
|
||||
channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
|
||||
|
||||
__ip22zilog_reset(up);
|
||||
|
||||
__load_zsregs(channel, up->curregs);
|
||||
/* set master interrupt enable */
|
||||
write_zsreg(channel, R9, up->curregs[R9]);
|
||||
up->prev_status = readb(&channel->control);
|
||||
|
||||
/* Enable receiver and transmitter. */
|
||||
|
|
@ -859,8 +894,6 @@ ip22zilog_set_termios(struct uart_port *port, struct ktermios *termios,
|
|||
else
|
||||
up->flags &= ~IP22ZILOG_FLAG_MODEM_STATUS;
|
||||
|
||||
up->cflag = termios->c_cflag;
|
||||
|
||||
ip22zilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
|
||||
uart_update_timeout(port, termios->c_cflag, baud);
|
||||
|
||||
|
|
@ -992,74 +1025,29 @@ ip22zilog_console_write(struct console *con, const char *s, unsigned int count)
|
|||
spin_unlock_irqrestore(&up->port.lock, flags);
|
||||
}
|
||||
|
||||
void
|
||||
ip22serial_console_termios(struct console *con, char *options)
|
||||
{
|
||||
int baud = 9600, bits = 8, cflag;
|
||||
int parity = 'n';
|
||||
int flow = 'n';
|
||||
|
||||
if (options)
|
||||
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
||||
|
||||
cflag = CREAD | HUPCL | CLOCAL;
|
||||
|
||||
switch (baud) {
|
||||
case 150: cflag |= B150; break;
|
||||
case 300: cflag |= B300; break;
|
||||
case 600: cflag |= B600; break;
|
||||
case 1200: cflag |= B1200; break;
|
||||
case 2400: cflag |= B2400; break;
|
||||
case 4800: cflag |= B4800; break;
|
||||
case 9600: cflag |= B9600; break;
|
||||
case 19200: cflag |= B19200; break;
|
||||
case 38400: cflag |= B38400; break;
|
||||
default: baud = 9600; cflag |= B9600; break;
|
||||
}
|
||||
|
||||
con->cflag = cflag | CS8; /* 8N1 */
|
||||
|
||||
uart_update_timeout(&ip22zilog_port_table[con->index].port, cflag, baud);
|
||||
}
|
||||
|
||||
static int __init ip22zilog_console_setup(struct console *con, char *options)
|
||||
{
|
||||
struct uart_ip22zilog_port *up = &ip22zilog_port_table[con->index];
|
||||
unsigned long flags;
|
||||
int baud, brg;
|
||||
int baud = 9600, bits = 8;
|
||||
int parity = 'n';
|
||||
int flow = 'n';
|
||||
|
||||
printk("Console: ttyS%d (IP22-Zilog)\n", con->index);
|
||||
up->flags |= IP22ZILOG_FLAG_IS_CONS;
|
||||
|
||||
/* Get firmware console settings. */
|
||||
ip22serial_console_termios(con, options);
|
||||
|
||||
/* 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);
|
||||
printk(KERN_INFO "Console: ttyS%d (IP22-Zilog)\n", con->index);
|
||||
|
||||
spin_lock_irqsave(&up->port.lock, flags);
|
||||
|
||||
up->curregs[R15] = BRKIE;
|
||||
ip22zilog_convert_to_zs(up, con->cflag, 0, brg);
|
||||
up->curregs[R15] |= BRKIE;
|
||||
|
||||
__ip22zilog_startup(up);
|
||||
|
||||
spin_unlock_irqrestore(&up->port.lock, flags);
|
||||
|
||||
return 0;
|
||||
if (options)
|
||||
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
||||
return uart_set_options(&up->port, con, baud, parity, bits, flow);
|
||||
}
|
||||
|
||||
static struct uart_driver ip22zilog_reg;
|
||||
|
|
@ -1140,25 +1128,10 @@ static void __init ip22zilog_prepare(void)
|
|||
up[(chip * 2) + 1].port.line = (chip * 2) + 1;
|
||||
up[(chip * 2) + 1].flags |= IP22ZILOG_FLAG_IS_CHANNEL_A;
|
||||
}
|
||||
}
|
||||
|
||||
static void __init ip22zilog_init_hw(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < NUM_CHANNELS; i++) {
|
||||
struct uart_ip22zilog_port *up = &ip22zilog_port_table[i];
|
||||
struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
|
||||
unsigned long flags;
|
||||
int baud, brg;
|
||||
|
||||
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);
|
||||
}
|
||||
for (channel = 0; channel < NUM_CHANNELS; channel++) {
|
||||
struct uart_ip22zilog_port *up = &ip22zilog_port_table[channel];
|
||||
int brg;
|
||||
|
||||
/* Normal serial TTY. */
|
||||
up->parity_mask = 0xff;
|
||||
|
|
@ -1169,16 +1142,10 @@ static void __init ip22zilog_init_hw(void)
|
|||
up->curregs[R9] = NV | MIE;
|
||||
up->curregs[R10] = NRZ;
|
||||
up->curregs[R11] = TCBR | RCBR;
|
||||
baud = 9600;
|
||||
brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
|
||||
brg = BPS_TO_BRG(9600, ZS_CLOCK / ZS_CLOCK_DIVISOR);
|
||||
up->curregs[R12] = (brg & 0xff);
|
||||
up->curregs[R13] = (brg >> 8) & 0xff;
|
||||
up->curregs[R14] = BRENAB;
|
||||
__load_zsregs(channel, up->curregs);
|
||||
/* set master interrupt enable */
|
||||
write_zsreg(channel, R9, up->curregs[R9]);
|
||||
|
||||
spin_unlock_irqrestore(&up->port.lock, flags);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1195,8 +1162,6 @@ static int __init ip22zilog_ports_init(void)
|
|||
panic("IP22-Zilog: Unable to register zs interrupt handler.\n");
|
||||
}
|
||||
|
||||
ip22zilog_init_hw();
|
||||
|
||||
ret = uart_register_driver(&ip22zilog_reg);
|
||||
if (ret == 0) {
|
||||
int i;
|
||||
|
|
|
|||
|
|
@ -209,8 +209,6 @@ extern void *set_except_vector(int n, void *addr);
|
|||
extern unsigned long ebase;
|
||||
extern void per_cpu_trap_init(void);
|
||||
|
||||
extern int stop_a_enabled;
|
||||
|
||||
/*
|
||||
* See include/asm-ia64/system.h; prevents deadlock on SMP
|
||||
* systems.
|
||||
|
|
|
|||
|
|
@ -437,7 +437,7 @@ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
|
|||
#ifdef SUPPORT_SYSRQ
|
||||
if (port->sysrq) {
|
||||
if (ch && time_before(jiffies, port->sysrq)) {
|
||||
handle_sysrq(ch, port->info->tty);
|
||||
handle_sysrq(ch, port->info ? port->info->tty : NULL);
|
||||
port->sysrq = 0;
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue