* SGI linux 2.4 console driver patch - again ...
@ 2003-09-25 16:43 Pat Gefre
0 siblings, 0 replies; only message in thread
From: Pat Gefre @ 2003-09-25 16:43 UTC (permalink / raw)
To: marcelo.tosatti; +Cc: linux-kernel
Sorry - I'll try again.
Most of this is code clean up-type things....
# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.1121 -> 1.1122
# drivers/char/Config.in 1.57 -> 1.58
# drivers/char/sn_serial.c 1.2 -> 1.3
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/09/25 pfg@attica.americas.sgi.com 1.1122
# Mods for 2.4 serial console driver - mostly code cleanup
# --------------------------------------------
#
diff -Nru a/drivers/char/Config.in b/drivers/char/Config.in
--- a/drivers/char/Config.in Thu Sep 25 07:35:55 2003
+++ b/drivers/char/Config.in Thu Sep 25 07:35:55 2003
@@ -104,11 +104,14 @@
fi
fi
fi
-fi
-if [ "$CONFIG_IA64_GENERIC" = "y" -o "$CONFIG_IA64_SGI_SN2" = "y" ] ; then
- bool 'SGI SN2 l1 serial port support' CONFIG_SGI_L1_SERIAL
- if [ "$CONFIG_SGI_L1_SERIAL" = "y" ]; then
- bool ' SGI SN2 l1 Console support' CONFIG_SGI_L1_SERIAL_CONSOLE
+ if [ "$CONFIG_IA64" = "y" ]; then
+ bool ' SGI SN2 l1 serial port support' CONFIG_SGI_L1_SERIAL
+ if [ "$CONFIG_SGI_L1_SERIAL" = "y" ]; then
+ bool ' SGI SN2 l1 Console support' CONFIG_SGI_L1_SERIAL_CONSOLE
+ fi
+ if [ "$CONFIG_IA64_GENERIC" = "y" -o "$CONFIG_IA64_SGI_SN2" = "y" ]; then
+ bool ' SGI SN2 IOC4 serial port support' CONFIG_SGI_IOC4_SERIAL
+ fi
fi
fi
if [ "$CONFIG_EXPERIMENTAL" = "y" -a "$CONFIG_ZORRO" = "y" ]; then
diff -Nru a/drivers/char/sn_serial.c b/drivers/char/sn_serial.c
--- a/drivers/char/sn_serial.c Thu Sep 25 07:35:55 2003
+++ b/drivers/char/sn_serial.c Thu Sep 25 07:35:55 2003
@@ -38,27 +38,19 @@
*/
#include <linux/config.h>
-#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/module.h>
-#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
-#endif
-#include <linux/string.h>
#include <linux/circ_buf.h>
#include <linux/serial_reg.h>
-#include <asm/irq.h>
-#include <asm/system.h>
-#include <asm/io.h>
+#include <asm/uaccess.h>
#include <asm/sn/sn_sal.h>
-#include <asm/sn/nodepda.h>
+#include <asm/sn/pci/pciio.h> /* this is needed for get_console_nasid */
#include <asm/sn/simulator.h>
-#include <asm/sn/sn2/intr.h>
#include <asm/sn/sn2/sn_private.h>
-#include <asm/sn/clksupport.h>
#if defined(CONFIG_SGI_L1_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static char sysrq_serial_str[] = "\eSYS";
@@ -66,60 +58,53 @@
static unsigned long sysrq_requested;
#endif /* CONFIG_SGI_L1_SERIAL_CONSOLE && CONFIG_MAGIC_SYSRQ */
-static char *serial_revdate = "2003-07-31";
-
-/* driver subtype - what does this mean? */
-#define SN_SAL_SUBTYPE 1
-
/* minor device number */
#define SN_SAL_MINOR 64
+#define SN_SAL_SUBTYPE 1
+
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 128
/* number of characters we can transmit to the SAL console at a time */
#define SN_SAL_MAX_CHARS 120
-/* event types for our task queue -- so far just one */
#define SN_SAL_EVENT_WRITE_WAKEUP 0
#define CONSOLE_RESTART 1
+
/* 64K, when we're asynch, it must be at least printk's LOG_BUF_LEN to
* avoid losing chars, (always has to be a power of 2) */
-#if 1
#define SN_SAL_BUFFER_SIZE (64 * (1 << 10))
-#else
-#define SN_SAL_BUFFER_SIZE (64)
-#endif
#define SN_SAL_UART_FIFO_DEPTH 16
#define SN_SAL_UART_FIFO_SPEED_CPS 9600/10
/* we don't kmalloc/get_free_page these as we want them available
* before either of those are initialized */
-static volatile char xmit_buff_mem[SN_SAL_BUFFER_SIZE];
+static char sn_xmit_buff_mem[SN_SAL_BUFFER_SIZE];
struct volatile_circ_buf {
- volatile char *buf;
- int head;
- int tail;
+ char *cb_buf;
+ int cb_head;
+ int cb_tail;
};
-static volatile struct volatile_circ_buf xmit = { .buf = xmit_buff_mem };
-static char sal_tmp_buffer[SN_SAL_BUFFER_SIZE];
+static struct volatile_circ_buf xmit = { .cb_buf = sn_xmit_buff_mem };
+static char sn_tmp_buffer[SN_SAL_BUFFER_SIZE];
-static volatile struct tty_struct *sn_sal_tty;
+static struct tty_struct *sn_sal_tty;
static struct timer_list sn_sal_timer;
static int sn_sal_event; /* event type for task queue */
static int sn_sal_refcount;
-static volatile int sn_sal_is_asynch;
-static volatile int sn_sal_irq;
+static int sn_sal_is_asynch;
+static int sn_sal_irq;
static spinlock_t sn_sal_lock = SPIN_LOCK_UNLOCKED;
-static volatile int tx_count;
-static volatile int rx_count;
+static int sn_total_tx_count;
+static int sn_total_rx_count;
static struct tty_struct *sn_sal_table;
static struct termios *sn_sal_termios;
@@ -128,32 +113,63 @@
static void sn_sal_tasklet_action(unsigned long data);
static DECLARE_TASKLET(sn_sal_tasklet, sn_sal_tasklet_action, 0);
-static volatile unsigned long interrupt_timeout;
+static unsigned long sn_interrupt_timeout;
extern u64 master_node_bedrock_address;
-int debug_printf(const char *fmt, ...);
+static int sn_debug_printf(const char *fmt, ...);
#undef DEBUG
#ifdef DEBUG
-#define DPRINTF(x...) debug_printf(x)
+#define DPRINTF(x...) sn_debug_printf(x)
#else
#define DPRINTF(x...) do { } while (0)
#endif
-static void intr_transmit_chars(void);
-static void poll_transmit_chars(void);
-static int sn_sal_write(struct tty_struct *tty, int from_user,
- const unsigned char *buf, int count);
-
struct sn_sal_ops {
- int (*puts)(const char *s, int len);
- int (*getc)(void);
- int (*input_pending)(void);
- void (*wakeup_transmit)(void);
+ int (*sal_puts)(const char *s, int len);
+ int (*sal_getc)(void);
+ int (*sal_input_pending)(void);
+ void (*sal_wakeup_transmit)(void);
};
-static volatile struct sn_sal_ops *sn_sal_ops;
+/* This is the pointer used. It is assigned to point to one of
+ * the tables below.
+ */
+static struct sn_sal_ops *sn_func;
+
+/* Prototypes */
+static int snt_hw_puts(const char *, int);
+static int snt_poll_getc(void);
+static int snt_poll_input_pending(void);
+static int snt_sim_puts(const char *, int);
+static int snt_sim_getc(void);
+static int snt_sim_input_pending(void);
+static int snt_intr_getc(void);
+static int snt_intr_input_pending(void);
+static void sn_intr_transmit_chars(void);
+
+/* A table for polling */
+static struct sn_sal_ops poll_ops = {
+ .sal_puts = snt_hw_puts,
+ .sal_getc = snt_poll_getc,
+ .sal_input_pending = snt_poll_input_pending
+};
+
+/* A table for the simulator */
+static struct sn_sal_ops sim_ops = {
+ .sal_puts = snt_sim_puts,
+ .sal_getc = snt_sim_getc,
+ .sal_input_pending = snt_sim_input_pending
+};
+
+/* A table for interrupts enabled */
+static struct sn_sal_ops intr_ops = {
+ .sal_puts = snt_hw_puts,
+ .sal_getc = snt_intr_getc,
+ .sal_input_pending = snt_intr_input_pending,
+ .sal_wakeup_transmit = sn_intr_transmit_chars
+};
/* the console does output in two distinctly different ways:
@@ -170,7 +186,8 @@
/* routines for running the console in polling mode */
-static int hw_puts(const char *s, int len)
+static int
+snt_hw_puts(const char *s, int len)
{
/* looking at the PROM source code, putb calls the flush
* routine, so if we send characters in FIFO sized chunks, it
@@ -178,14 +195,16 @@
return ia64_sn_console_putb(s, len);
}
-static int poll_getc(void)
+static int
+snt_poll_getc(void)
{
int ch;
ia64_sn_console_getc(&ch);
return ch;
}
-static int poll_input_pending(void)
+static int
+snt_poll_input_pending(void)
{
int status, input;
@@ -193,16 +212,11 @@
return !status && input;
}
-static struct sn_sal_ops poll_ops = {
- .puts = hw_puts,
- .getc = poll_getc,
- .input_pending = poll_input_pending
-};
-
/* routines for running the console on the simulator */
-static int sim_puts(const char *str, int count)
+static int
+snt_sim_puts(const char *str, int count)
{
int counter = count;
@@ -223,65 +237,64 @@
return count;
}
-static int sim_getc(void)
+static int
+snt_sim_getc(void)
{
return readb(master_node_bedrock_address + (UART_RX << 3));
}
-static int sim_input_pending(void)
+static int
+snt_sim_input_pending(void)
{
return readb(master_node_bedrock_address + (UART_LSR << 3)) & UART_LSR_DR;
}
-static struct sn_sal_ops sim_ops = {
- .puts = sim_puts,
- .getc = sim_getc,
- .input_pending = sim_input_pending
-};
-
/* routines for an interrupt driven console (normal) */
-static int intr_getc(void)
+static int
+snt_intr_getc(void)
{
return ia64_sn_console_readc();
}
-static int intr_input_pending(void)
+static int
+snt_intr_input_pending(void)
{
return ia64_sn_console_intr_status() & SAL_CONSOLE_INTR_RECV;
}
-static struct sn_sal_ops intr_ops = {
- .puts = hw_puts,
- .getc = intr_getc,
- .input_pending = intr_input_pending,
- .wakeup_transmit = intr_transmit_chars
-};
-
-extern void early_sn_setup(void);
+/* The early printk (possible setup) and function call */
void
early_printk_sn_sal(const char *s, unsigned count)
{
- if (!sn_sal_ops) {
+#if defined(CONFIG_IA64_EARLY_PRINTK_SGI_SN) || defined(CONFIG_IA64_SGI_SN_SIM)
+ extern void early_sn_setup(void);
+#endif
+
+ if (!sn_func) {
if (IS_RUNNING_ON_SIMULATOR())
- sn_sal_ops = &sim_ops;
+ sn_func = &sim_ops;
else
- sn_sal_ops = &poll_ops;
+ sn_func = &poll_ops;
+#if defined(CONFIG_IA64_EARLY_PRINTK_SGI_SN) || defined(CONFIG_IA64_SGI_SN_SIM)
early_sn_setup();
+#endif
}
- sn_sal_ops->puts(s, count);
+ sn_func->sal_puts(s, count);
}
/* this is as "close to the metal" as we can get, used when the driver
* itself may be broken */
-int debug_printf(const char *fmt, ...)
+static int
+sn_debug_printf(const char *fmt, ...)
{
static char printk_buf[1024];
int printed_len;
va_list args;
+
va_start(args, fmt);
printed_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args);
early_printk_sn_sal(printk_buf, printed_len);
@@ -289,7 +302,7 @@
return printed_len;
}
-/*********************************************************************
+/*
* Interrupt handling routines.
*/
@@ -300,29 +313,29 @@
tasklet_schedule(&sn_sal_tasklet);
}
-/* receive_chars can be called before sn_sal_tty is initialized. in
+/* sn_receive_chars can be called before sn_sal_tty is initialized. in
* that case, its only use is to trigger sysrq and kdb */
static void
-receive_chars(struct pt_regs *regs)
+sn_receive_chars(struct pt_regs *regs, unsigned long *flags)
{
int ch;
- while (sn_sal_ops->input_pending()) {
- ch = sn_sal_ops->getc();
+ while (sn_func->sal_input_pending()) {
+ ch = sn_func->sal_getc();
if (ch < 0) {
printk(KERN_ERR "sn_serial: An error occured while "
"obtaining data from the console (0x%0x)\n", ch);
break;
}
-
#if defined(CONFIG_SGI_L1_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (sysrq_requested) {
unsigned long sysrq_timeout = sysrq_requested + HZ*5;
+
sysrq_requested = 0;
if (ch && time_before(jiffies, sysrq_timeout)) {
- spin_unlock(&sn_sal_lock);
+ spin_unlock_irqrestore(&sn_sal_lock, *flags);
handle_sysrq(ch, regs, NULL, NULL);
- spin_lock(&sn_sal_lock);
+ spin_lock_irqsave(&sn_sal_lock, *flags);
/* don't record this char */
continue;
}
@@ -344,11 +357,11 @@
if (sn_sal_tty->flip.count == TTY_FLIPBUF_SIZE)
break;
}
- rx_count++;
+ sn_total_rx_count++;
}
if (sn_sal_tty)
- tty_flip_buffer_push(sn_sal_tty);
+ tty_flip_buffer_push((struct tty_struct *)sn_sal_tty);
}
@@ -360,43 +373,40 @@
int result;
char *start;
- if (xmit.head == xmit.tail)
- /* Nothing to do. */
- return;
+ if (xmit.cb_head == xmit.cb_tail)
+ return; /* Nothing to do. */
- head = xmit.head;
- tail = xmit.tail;
- start = &xmit.buf[tail];
+ head = xmit.cb_head;
+ tail = xmit.cb_tail;
+ start = &xmit.cb_buf[tail];
/* twice around gets the tail to the end of the buffer and
* then to the head, if needed */
loops = (head < tail) ? 2 : 1;
for (ii = 0; ii < loops; ii++) {
- xmit_count = (head < tail) ?
- (SN_SAL_BUFFER_SIZE - tail) : (head - tail);
+ xmit_count = (head < tail) ? (SN_SAL_BUFFER_SIZE - tail) : (head - tail);
if (xmit_count > 0) {
- result = sn_sal_ops->puts(start, xmit_count);
+ result = sn_func->sal_puts((char *)start, xmit_count);
if (!result)
- debug_printf("\n*** synch_flush_xmit failed to flush\n");
+ sn_debug_printf("\n*** synch_flush_xmit failed to flush\n");
if (result > 0) {
xmit_count -= result;
- tx_count += result;
+ sn_total_tx_count += result;
tail += result;
tail &= SN_SAL_BUFFER_SIZE - 1;
- xmit.tail = tail;
- start = &xmit.buf[tail];
+ xmit.cb_tail = tail;
+ start = (char *)&xmit.cb_buf[tail];
}
}
}
-
}
/* must be called with a lock protecting the circular buffer and
* sn_sal_tty */
static void
-poll_transmit_chars(void)
+sn_poll_transmit_chars(void)
{
int xmit_count, tail, head;
int result;
@@ -404,44 +414,40 @@
BUG_ON(!sn_sal_is_asynch);
- if (xmit.head == xmit.tail ||
+ if (xmit.cb_head == xmit.cb_tail ||
(sn_sal_tty && (sn_sal_tty->stopped || sn_sal_tty->hw_stopped))) {
/* Nothing to do. */
return;
}
- head = xmit.head;
- tail = xmit.tail;
- start = &xmit.buf[tail];
+ head = xmit.cb_head;
+ tail = xmit.cb_tail;
+ start = &xmit.cb_buf[tail];
- xmit_count = (head < tail) ?
- (SN_SAL_BUFFER_SIZE - tail) : (head - tail);
+ xmit_count = (head < tail) ? (SN_SAL_BUFFER_SIZE - tail) : (head - tail);
if (xmit_count == 0)
- debug_printf("\n*** empty xmit_count\n");
+ sn_debug_printf("\n*** empty xmit_count\n");
- if (xmit_count > SN_SAL_UART_FIFO_DEPTH)
- xmit_count = SN_SAL_UART_FIFO_DEPTH;
-
/* use the ops, as we could be on the simulator */
- result = sn_sal_ops->puts(start, xmit_count);
+ result = sn_func->sal_puts((char *)start, xmit_count);
if (!result)
- debug_printf("\n*** error in synchronous puts\n");
+ sn_debug_printf("\n*** error in synchronous sal_puts\n");
/* XXX chadt clean this up */
if (result > 0) {
xmit_count -= result;
- tx_count += result;
+ sn_total_tx_count += result;
tail += result;
tail &= SN_SAL_BUFFER_SIZE - 1;
- xmit.tail = tail;
- start = &xmit.buf[tail];
+ xmit.cb_tail = tail;
+ start = &xmit.cb_buf[tail];
}
/* if there's few enough characters left in the xmit buffer
* that we could stand for the upper layer to send us some
* more, ask for it. */
if (sn_sal_tty)
- if (CIRC_CNT(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE) < WAKEUP_CHARS)
+ if (CIRC_CNT(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE) < WAKEUP_CHARS)
sn_sal_sched_event(SN_SAL_EVENT_WRITE_WAKEUP);
}
@@ -449,7 +455,7 @@
/* must be called with a lock protecting the circular buffer and
* sn_sal_tty */
static void
-intr_transmit_chars(void)
+sn_intr_transmit_chars(void)
{
int xmit_count, tail, head, loops, ii;
int result;
@@ -457,15 +463,15 @@
BUG_ON(!sn_sal_is_asynch);
- if (xmit.head == xmit.tail ||
+ if (xmit.cb_head == xmit.cb_tail ||
(sn_sal_tty && (sn_sal_tty->stopped || sn_sal_tty->hw_stopped))) {
/* Nothing to do. */
return;
}
- head = xmit.head;
- tail = xmit.tail;
- start = &xmit.buf[tail];
+ head = xmit.cb_head;
+ tail = xmit.cb_tail;
+ start = &xmit.cb_buf[tail];
/* twice around gets the tail to the end of the buffer and
* then to the head, if needed */
@@ -476,18 +482,18 @@
(SN_SAL_BUFFER_SIZE - tail) : (head - tail);
if (xmit_count > 0) {
- result = ia64_sn_console_xmit_chars(start, xmit_count);
+ result = ia64_sn_console_xmit_chars((char *)start, xmit_count);
#ifdef DEBUG
if (!result)
- debug_printf("`");
+ sn_debug_printf("`");
#endif
if (result > 0) {
xmit_count -= result;
- tx_count += result;
+ sn_total_tx_count += result;
tail += result;
tail &= SN_SAL_BUFFER_SIZE - 1;
- xmit.tail = tail;
- start = &xmit.buf[tail];
+ xmit.cb_tail = tail;
+ start = &xmit.cb_buf[tail];
}
}
}
@@ -496,7 +502,7 @@
* that we could stand for the upper layer to send us some
* more, ask for it. */
if (sn_sal_tty)
- if (CIRC_CNT(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE) < WAKEUP_CHARS)
+ if (CIRC_CNT(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE) < WAKEUP_CHARS)
sn_sal_sched_event(SN_SAL_EVENT_WRITE_WAKEUP);
}
@@ -508,13 +514,14 @@
* SAL, since it doesn't intercept the UART interrupts
* itself */
int status = ia64_sn_console_intr_status();
+ unsigned long flags;
- spin_lock(&sn_sal_lock);
+ spin_lock_irqsave(&sn_sal_lock, flags);
if (status & SAL_CONSOLE_INTR_RECV)
- receive_chars(regs);
+ sn_receive_chars(regs, &flags);
if (status & SAL_CONSOLE_INTR_XMIT)
- intr_transmit_chars();
- spin_unlock(&sn_sal_lock);
+ sn_intr_transmit_chars();
+ spin_unlock_irqrestore(&sn_sal_lock, flags);
}
@@ -539,17 +546,15 @@
}
console_nasid = ia64_sn_get_console_nasid();
- intr_cpuid = NODEPDA(NASID_TO_COMPACT_NODEID(console_nasid))
- ->node_first_cpu;
+ intr_cpuid = NODEPDA(NASID_TO_COMPACT_NODEID(console_nasid))->node_first_cpu;
intr_cpuloc = cpu_physical_id(intr_cpuid);
console_irq = CPU_VECTOR_TO_IRQ(intr_cpuloc, SGI_UART_VECTOR);
- result = intr_connect_level(intr_cpuid, SGI_UART_VECTOR,
- 0 /*not used*/, 0 /*not used*/);
+ result = intr_connect_level(intr_cpuid, SGI_UART_VECTOR, 0 /*not used*/, 0 /*not used*/);
BUG_ON(result != SGI_UART_VECTOR);
- result = request_irq(console_irq, sn_sal_interrupt,
- SA_INTERRUPT, "SAL console driver", &sn_sal_tty);
+ result = request_irq(console_irq, sn_sal_interrupt, SA_INTERRUPT,
+ "SAL console driver", &sn_sal_tty);
if (result >= 0)
return console_irq;
@@ -557,11 +562,6 @@
return 0;
}
-/*
- * End of the interrupt routines.
- *********************************************************************/
-
-
static void
sn_sal_tasklet_action(unsigned long data)
{
@@ -569,13 +569,14 @@
if (sn_sal_tty) {
spin_lock_irqsave(&sn_sal_lock, flags);
- if (sn_sal_tty)
+ if (sn_sal_tty) {
if (test_and_clear_bit(SN_SAL_EVENT_WRITE_WAKEUP, &sn_sal_event)) {
- if ((sn_sal_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- sn_sal_tty->ldisc.write_wakeup)
- (sn_sal_tty->ldisc.write_wakeup)(sn_sal_tty);
- wake_up_interruptible(&sn_sal_tty->write_wait);
+ if ((sn_sal_tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
+ && sn_sal_tty->ldisc.write_wakeup)
+ (sn_sal_tty->ldisc.write_wakeup)((struct tty_struct *)sn_sal_tty);
+ wake_up_interruptible((wait_queue_head_t *)&sn_sal_tty->write_wait);
}
+ }
spin_unlock_irqrestore(&sn_sal_lock, flags);
}
}
@@ -587,12 +588,14 @@
static void
sn_sal_timer_poll(unsigned long dummy)
{
+ unsigned long flags;
+
if (!sn_sal_irq) {
- spin_lock(&sn_sal_lock);
- receive_chars(NULL);
- poll_transmit_chars();
- spin_unlock(&sn_sal_lock);
- mod_timer(&sn_sal_timer, jiffies + interrupt_timeout);
+ spin_lock_irqsave(&sn_sal_lock, flags);
+ sn_receive_chars(NULL, &flags);
+ sn_poll_transmit_chars();
+ spin_unlock_irqrestore(&sn_sal_lock, flags);
+ mod_timer(&sn_sal_timer, jiffies + sn_interrupt_timeout);
}
}
@@ -604,15 +607,10 @@
local_irq_save(flags);
sn_sal_interrupt(0, NULL, NULL);
local_irq_restore(flags);
- mod_timer(&sn_sal_timer, jiffies + interrupt_timeout);
+ mod_timer(&sn_sal_timer, jiffies + sn_interrupt_timeout);
}
/*
- * End of "sofware interrupt" routines.
- *********************************************************************/
-
-
-/*********************************************************************
* User-level console routines
*/
@@ -639,7 +637,7 @@
static void
sn_sal_close(struct tty_struct *tty, struct file * filp)
{
- if (atomic_read(&tty->count) == 1) {
+ if (tty->count == 1) {
unsigned long flags;
tty->closing = 1;
if (tty->driver.flush_buffer)
@@ -664,7 +662,7 @@
if (from_user) {
while (1) {
int c1;
- c = CIRC_SPACE_TO_END(xmit.head, xmit.tail,
+ c = CIRC_SPACE_TO_END(xmit.cb_head, xmit.cb_tail,
SN_SAL_BUFFER_SIZE);
if (count < c)
@@ -672,7 +670,7 @@
if (c <= 0)
break;
- c -= copy_from_user(sal_tmp_buffer, buf, c);
+ c -= copy_from_user(sn_tmp_buffer, buf, c);
if (!c) {
if (!ret)
ret = -EFAULT;
@@ -683,14 +681,13 @@
* moved since the last time we looked.
*/
spin_lock_irqsave(&sn_sal_lock, flags);
- c1 = CIRC_SPACE_TO_END(xmit.head, xmit.tail,
- SN_SAL_BUFFER_SIZE);
+ c1 = CIRC_SPACE_TO_END(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE);
if (c1 < c)
c = c1;
- memcpy(xmit.buf + xmit.head, sal_tmp_buffer, c);
- xmit.head = ((xmit.head + c) & (SN_SAL_BUFFER_SIZE - 1));
+ memcpy(xmit.cb_buf + xmit.cb_head, sn_tmp_buffer, c);
+ xmit.cb_head = ((xmit.cb_head + c) & (SN_SAL_BUFFER_SIZE - 1));
spin_unlock_irqrestore(&sn_sal_lock, flags);
buf += c;
@@ -699,20 +696,19 @@
}
} else {
/* The buffer passed in isn't coming from userland,
- * so cut out the middleman (sal_tmp_buffer).
+ * so cut out the middleman (sn_tmp_buffer).
*/
spin_lock_irqsave(&sn_sal_lock, flags);
while (1) {
- c = CIRC_SPACE_TO_END(xmit.head, xmit.tail,
- SN_SAL_BUFFER_SIZE);
+ c = CIRC_SPACE_TO_END(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE);
if (count < c)
c = count;
if (c <= 0) {
break;
}
- memcpy(xmit.buf + xmit.head, buf, c);
- xmit.head = ((xmit.head + c) & (SN_SAL_BUFFER_SIZE - 1));
+ memcpy(xmit.cb_buf + xmit.cb_head, buf, c);
+ xmit.cb_head = ((xmit.cb_head + c) & (SN_SAL_BUFFER_SIZE - 1));
buf += c;
count -= c;
ret += c;
@@ -721,10 +717,9 @@
}
spin_lock_irqsave(&sn_sal_lock, flags);
- if (xmit.head != xmit.tail &&
- !(tty && (tty->stopped || tty->hw_stopped)))
- if (sn_sal_ops->wakeup_transmit)
- sn_sal_ops->wakeup_transmit();
+ if (xmit.cb_head != xmit.cb_tail && !(tty && (tty->stopped || tty->hw_stopped)))
+ if (sn_func->sal_wakeup_transmit)
+ sn_func->sal_wakeup_transmit();
spin_unlock_irqrestore(&sn_sal_lock, flags);
return ret;
@@ -737,10 +732,11 @@
unsigned long flags;
spin_lock_irqsave(&sn_sal_lock, flags);
- if (CIRC_SPACE(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE) != 0) {
- xmit.buf[xmit.head] = ch;
- xmit.head = (xmit.head + 1) & (SN_SAL_BUFFER_SIZE-1);
- sn_sal_ops->wakeup_transmit();
+ if (CIRC_SPACE(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE) != 0) {
+ xmit.cb_buf[xmit.cb_head] = ch;
+ xmit.cb_head = (xmit.cb_head + 1) & (SN_SAL_BUFFER_SIZE-1);
+ if ( sn_func->sal_wakeup_transmit )
+ sn_func->sal_wakeup_transmit();
}
spin_unlock_irqrestore(&sn_sal_lock, flags);
}
@@ -752,9 +748,9 @@
unsigned long flags;
spin_lock_irqsave(&sn_sal_lock, flags);
- if (CIRC_CNT(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE))
- if (sn_sal_ops->wakeup_transmit)
- sn_sal_ops->wakeup_transmit();
+ if (CIRC_CNT(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE))
+ if (sn_func->sal_wakeup_transmit)
+ sn_func->sal_wakeup_transmit();
spin_unlock_irqrestore(&sn_sal_lock, flags);
}
@@ -766,7 +762,7 @@
int space;
spin_lock_irqsave(&sn_sal_lock, flags);
- space = CIRC_SPACE(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE);
+ space = CIRC_SPACE(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE);
spin_unlock_irqrestore(&sn_sal_lock, flags);
return space;
}
@@ -779,23 +775,13 @@
int space;
spin_lock_irqsave(&sn_sal_lock, flags);
- space = CIRC_CNT(xmit.head, xmit.tail, SN_SAL_BUFFER_SIZE);
+ space = CIRC_CNT(xmit.cb_head, xmit.cb_tail, SN_SAL_BUFFER_SIZE);
DPRINTF("<%d>", space);
spin_unlock_irqrestore(&sn_sal_lock, flags);
return space;
}
-static int
-sn_sal_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- /* nothing supported */
-
- return -ENOIOCTLCMD;
-}
-
-
static void
sn_sal_flush_buffer(struct tty_struct *tty)
{
@@ -803,13 +789,12 @@
/* drop everything */
spin_lock_irqsave(&sn_sal_lock, flags);
- xmit.head = xmit.tail = 0;
+ xmit.cb_head = xmit.cb_tail = 0;
spin_unlock_irqrestore(&sn_sal_lock, flags);
/* wake up tty level */
wake_up_interruptible(&tty->write_wait);
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
}
@@ -841,11 +826,10 @@
{
int len = 0;
off_t begin = 0;
- extern nasid_t get_console_nasid(void);
- len += sprintf(page, "sn_serial: revision:%s nasid:%d irq:%d tx:%d rx:%d\n",
- serial_revdate, get_console_nasid(), sn_sal_irq,
- tx_count, rx_count);
+ len += sprintf(page, "sn_serial: nasid:%d irq:%d tx:%d rx:%d\n",
+ snia_get_console_nasid(), sn_sal_irq,
+ sn_total_tx_count, sn_total_rx_count);
*eof = 1;
if (off >= len+begin)
@@ -857,39 +841,38 @@
static struct tty_driver sn_sal_driver = {
- .magic = TTY_DRIVER_MAGIC,
- .driver_name = "sn_serial",
+ .magic = TTY_DRIVER_MAGIC,
+ .driver_name = "sn_serial",
#if defined(CONFIG_DEVFS_FS)
- .name = "tts/%d",
+ .name = "tts/%d",
#else
- .name = "ttyS",
+ .name = "ttyS",
#endif
- .major = TTY_MAJOR,
- .minor_start = SN_SAL_MINOR,
- .num = 1,
- .type = TTY_DRIVER_TYPE_SERIAL,
- .subtype = SN_SAL_SUBTYPE,
- .flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS,
- .refcount = &sn_sal_refcount,
- .table = &sn_sal_table,
- .termios = &sn_sal_termios,
+ .major = TTY_MAJOR,
+ .minor_start = SN_SAL_MINOR,
+ .num = 1,
+ .type = TTY_DRIVER_TYPE_SERIAL,
+ .subtype = SN_SAL_SUBTYPE,
+ .flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS,
+ .refcount = &sn_sal_refcount,
+ .table = &sn_sal_table,
+ .termios = &sn_sal_termios,
.termios_locked = &sn_sal_termios_locked,
- .open = sn_sal_open,
- .close = sn_sal_close,
- .write = sn_sal_write,
- .put_char = sn_sal_put_char,
- .flush_chars = sn_sal_flush_chars,
- .write_room = sn_sal_write_room,
+ .open = sn_sal_open,
+ .close = sn_sal_close,
+ .write = sn_sal_write,
+ .put_char = sn_sal_put_char,
+ .flush_chars = sn_sal_flush_chars,
+ .write_room = sn_sal_write_room,
.chars_in_buffer = sn_sal_chars_in_buffer,
- .ioctl = sn_sal_ioctl,
- .hangup = sn_sal_hangup,
+ .hangup = sn_sal_hangup,
.wait_until_sent = sn_sal_wait_until_sent,
- .read_proc = sn_sal_read_proc,
+ .read_proc = sn_sal_read_proc,
};
/* sn_sal_init wishlist:
- * - allocate sal_tmp_buffer
+ * - allocate sn_tmp_buffer
* - fix up the tty_driver struct
* - turn on receive interrupts
* - do any termios twiddling once and for all
@@ -902,19 +885,21 @@
static void __init
sn_sal_switch_to_asynch(void)
{
- debug_printf("sn_serial: about to switch to asynchronous console\n");
+ unsigned long flags;
+
+ sn_debug_printf("sn_serial: about to switch to asynchronous console\n");
/* without early_printk, we may be invoked late enough to race
* with other cpus doing console IO at this point, however
* console interrupts will never be enabled */
- spin_lock(&sn_sal_lock);
+ spin_lock_irqsave(&sn_sal_lock, flags);
/* early_printk invocation may have done this for us */
- if (!sn_sal_ops) {
+ if (!sn_func) {
if (IS_RUNNING_ON_SIMULATOR())
- sn_sal_ops = &sim_ops;
+ sn_func = &sim_ops;
else
- sn_sal_ops = &poll_ops;
+ sn_func = &poll_ops;
}
/* we can't turn on the console interrupt (as request_irq
@@ -926,17 +911,17 @@
sn_sal_timer.function = sn_sal_timer_poll;
if (IS_RUNNING_ON_SIMULATOR())
- interrupt_timeout = 6;
- else
+ sn_interrupt_timeout = 6;
+ else {
/* 960cps / 16 char FIFO = 60HZ
- HZ / (SN_SAL_FIFO_SPEED_CPS / SN_SAL_FIFO_DEPTH) */
- interrupt_timeout = HZ * SN_SAL_UART_FIFO_DEPTH /
- SN_SAL_UART_FIFO_SPEED_CPS;
-
- mod_timer(&sn_sal_timer, jiffies + interrupt_timeout);
+ * HZ / (SN_SAL_FIFO_SPEED_CPS / SN_SAL_FIFO_DEPTH) */
+ sn_interrupt_timeout = HZ * SN_SAL_UART_FIFO_DEPTH
+ / SN_SAL_UART_FIFO_SPEED_CPS;
+ }
+ mod_timer(&sn_sal_timer, jiffies + sn_interrupt_timeout);
sn_sal_is_asynch = 1;
- spin_unlock(&sn_sal_lock);
+ spin_unlock_irqrestore(&sn_sal_lock, flags);
}
static void __init
@@ -944,17 +929,19 @@
{
int irq;
- debug_printf("sn_serial: switching to interrupt driven console\n");
+ sn_debug_printf("sn_serial: switching to interrupt driven console\n");
irq = sn_sal_connect_interrupt();
if (irq) {
unsigned long flags;
spin_lock_irqsave(&sn_sal_lock, flags);
+
/* sn_sal_irq is a global variable. When it's set to
* a non-zero value, we stop polling for input (since
* interrupts should now be enabled). */
sn_sal_irq = irq;
- sn_sal_ops = &intr_ops;
+ sn_func = &intr_ops;
+
/* turn on receive interrupts */
ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);
@@ -965,9 +952,9 @@
if (CONSOLE_RESTART) {
/* kick the console every once in a while in
* case we miss an interrupt */
- interrupt_timeout = 20*HZ;
+ sn_interrupt_timeout = 20*HZ;
sn_sal_timer.function = sn_sal_timer_restart;
- mod_timer(&sn_sal_timer, jiffies + interrupt_timeout);
+ mod_timer(&sn_sal_timer, jiffies + sn_interrupt_timeout);
}
spin_unlock_irqrestore(&sn_sal_lock, flags);
}
@@ -989,8 +976,7 @@
if (!sn_sal_is_asynch)
sn_sal_switch_to_asynch();
- /* at this point (module_init) we can try to turn on
- * interrupts */
+ /* at this point (module_init) we can try to turn on interrupts */
if (!IS_RUNNING_ON_SIMULATOR())
sn_sal_switch_to_interrupts();
@@ -1011,26 +997,14 @@
static void __exit
sn_sal_module_exit(void)
{
- unsigned long flags;
- int e;
-
del_timer_sync(&sn_sal_timer);
- spin_lock_irqsave(&sn_sal_lock, flags);
- if ((e = tty_unregister_driver(&sn_sal_driver)))
- printk(KERN_ERR "sn_serial: failed to unregister driver (%d)\n", e);
-
- spin_unlock_irqrestore(&sn_sal_lock, flags);
+ tty_unregister_driver(&sn_sal_driver);
}
module_init(sn_sal_module_init);
module_exit(sn_sal_module_exit);
/*
- * End of user-level console routines.
- *********************************************************************/
-
-
-/*********************************************************************
* Kernel console definitions
*/
@@ -1042,24 +1016,33 @@
static void
sn_sal_console_write(struct console *co, const char *s, unsigned count)
{
- BUG_ON(!sn_sal_is_asynch);
+ unsigned long flags;
- if (count > CIRC_SPACE_TO_END(xmit.head, xmit.tail,
+ if (count > CIRC_SPACE_TO_END(xmit.cb_head, xmit.cb_tail,
SN_SAL_BUFFER_SIZE))
- debug_printf("\n*** SN_SAL_BUFFER_SIZE too small, lost chars\n");
+ sn_debug_printf("\n*** SN_SAL_BUFFER_SIZE too small, lost chars\n");
/* somebody really wants this output, might be an
* oops, kdb, panic, etc. make sure they get it. */
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
if (spin_is_locked(&sn_sal_lock)) {
synch_flush_xmit();
- sn_sal_ops->puts(s, count);
- } else if (in_interrupt()) {
- spin_lock(&sn_sal_lock);
- synch_flush_xmit();
- spin_unlock(&sn_sal_lock);
- sn_sal_ops->puts(s, count);
+ sn_func->sal_puts(s, count);
} else
+#endif
+ if (in_interrupt()) {
+ spin_lock_irqsave(&sn_sal_lock, flags);
+ synch_flush_xmit();
+ spin_unlock_irqrestore(&sn_sal_lock, flags);
+ sn_func->sal_puts(s, count);
+ } else {
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
sn_sal_write(NULL, 0, s, count);
+#else
+ synch_flush_xmit();
+ sn_func->sal_puts(s, count);
+#endif
+ }
}
static kdev_t
@@ -1076,17 +1059,12 @@
static struct console sal_console = {
- .name = "ttyS",
- .write = sn_sal_console_write,
- .device = sn_sal_console_device,
- .setup = sn_sal_console_setup,
- .index = -1
+ .name = "ttyS",
+ .write = sn_sal_console_write,
+ .device = sn_sal_console_device,
+ .setup = sn_sal_console_setup,
+ .index = -1
};
-
-/*
- * End of kernel console definitions.
- *********************************************************************/
-
void __init
sn_sal_serial_console_init(void)
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2003-09-25 16:43 SGI linux 2.4 console driver patch - again Pat Gefre
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