summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/sun4d_irq.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/sun4d_irq.c')
-rw-r--r--arch/sparc/kernel/sun4d_irq.c195
1 files changed, 109 insertions, 86 deletions
diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
index 3af649e64f0..5fc4c220158 100644
--- a/arch/sparc/kernel/sun4d_irq.c
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -1,49 +1,48 @@
/*
- * arch/sparc/kernel/sun4d_irq.c:
- * SS1000/SC2000 interrupt handling.
+ * SS1000/SC2000 interrupt handling.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Heavily based on arch/sparc/kernel/irq.c.
*/
-#include <linux/errno.h>
-#include <linux/linkage.h>
#include <linux/kernel_stat.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/ptrace.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/random.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/spinlock.h>
#include <linux/seq_file.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-
-#include <asm/ptrace.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/psr.h>
-#include <asm/smp.h>
-#include <asm/vaddrs.h>
+
#include <asm/timer.h>
-#include <asm/openprom.h>
-#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
#include <asm/sbi.h>
#include <asm/cacheflush.h>
-#include <asm/irq_regs.h>
#include "kernel.h"
#include "irq.h"
-/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
+/* Sun4d interrupts fall roughly into two categories. SBUS and
+ * cpu local. CPU local interrupts cover the timer interrupts
+ * and whatnot, and we encode those as normal PILs between
+ * 0 and 15.
+ *
+ * SBUS interrupts are encoded integers including the board number
+ * (plus one), the SBUS level, and the SBUS slot number. Sun4D
+ * IRQ dispatch is done by:
+ *
+ * 1) Reading the BW local interrupt table in order to get the bus
+ * interrupt mask.
+ *
+ * This table is indexed by SBUS interrupt level which can be
+ * derived from the PIL we got interrupted on.
+ *
+ * 2) For each bus showing interrupt pending from #1, read the
+ * SBI interrupt state register. This will indicate which slots
+ * have interrupts pending for that SBUS interrupt level.
+ */
+
+/*
+ * If you trust current SCSI layer to handle different
+ * SCSI IRQs, enable this.
+ * I don't trust it... -jj
+ */
/* #define DISTRIBUTE_IRQS */
struct sun4d_timer_regs {
@@ -59,11 +58,9 @@ static struct sun4d_timer_regs __iomem *sun4d_timers;
#define TIMER_IRQ 10
#define MAX_STATIC_ALLOC 4
-extern int static_irq_count;
static unsigned char sbus_tid[32];
static struct irqaction *irq_action[NR_IRQS];
-extern spinlock_t irq_action_lock;
static struct sbus_action {
struct irqaction *action;
@@ -71,11 +68,33 @@ static struct sbus_action {
} *sbus_actions;
static int pil_to_sbus[] = {
- 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
+ 0,
+ 0,
+ 1,
+ 2,
+ 0,
+ 3,
+ 0,
+ 4,
+ 0,
+ 5,
+ 0,
+ 6,
+ 0,
+ 7,
+ 0,
+ 0,
};
static int sbus_to_pil[] = {
- 0, 2, 3, 5, 7, 9, 11, 13,
+ 0,
+ 2,
+ 3,
+ 5,
+ 7,
+ 9,
+ 11,
+ 13,
};
static int nsbi;
@@ -86,7 +105,7 @@ DEFINE_SPINLOCK(sun4d_imsk_lock);
int show_sun4d_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j = 0, k = 0, sbusl;
- struct irqaction * action;
+ struct irqaction *action;
unsigned long flags;
#ifdef CONFIG_SMP
int x;
@@ -96,13 +115,14 @@ int show_sun4d_interrupts(struct seq_file *p, void *v)
if (i < NR_IRQS) {
sbusl = pil_to_sbus[i];
if (!sbusl) {
- action = *(i + irq_action);
- if (!action)
- goto out_unlock;
+ action = *(i + irq_action);
+ if (!action)
+ goto out_unlock;
} else {
for (j = 0; j < nsbi; j++) {
for (k = 0; k < 4; k++)
- if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
+ action = sbus_actions[(j << 5) + (sbusl << 2) + k].action;
+ if (action)
goto found_it;
}
goto out_unlock;
@@ -125,15 +145,17 @@ found_it: seq_printf(p, "%3d: ", i);
(action->flags & IRQF_DISABLED) ? " +" : "",
action->name);
}
- if (!sbusl) break;
+ if (!sbusl)
+ break;
k++;
- if (k < 4)
- action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
- else {
+ if (k < 4) {
+ action = sbus_actions[(j << 5) + (sbusl << 2) + k].action;
+ } else {
j++;
- if (j == nsbi) break;
+ if (j == nsbi)
+ break;
k = 0;
- action = sbus_actions [(j << 5) + (sbusl << 2)].action;
+ action = sbus_actions[(j << 5) + (sbusl << 2)].action;
}
}
seq_putc(p, '\n');
@@ -147,7 +169,7 @@ void sun4d_free_irq(unsigned int irq, void *dev_id)
{
struct irqaction *action, **actionp;
struct irqaction *tmp = NULL;
- unsigned long flags;
+ unsigned long flags;
spin_lock_irqsave(&irq_action_lock, flags);
if (irq < 15)
@@ -156,7 +178,7 @@ void sun4d_free_irq(unsigned int irq, void *dev_id)
actionp = &(sbus_actions[irq - (1 << 5)].action);
action = *actionp;
if (!action) {
- printk("Trying to free free IRQ%d\n",irq);
+ printk(KERN_ERR "Trying to free free IRQ%d\n", irq);
goto out_unlock;
}
if (dev_id) {
@@ -166,23 +188,25 @@ void sun4d_free_irq(unsigned int irq, void *dev_id)
tmp = action;
}
if (!action) {
- printk("Trying to free free shared IRQ%d\n",irq);
+ printk(KERN_ERR "Trying to free free shared IRQ%d\n",
+ irq);
goto out_unlock;
}
} else if (action->flags & IRQF_SHARED) {
- printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
+ printk(KERN_ERR "Trying to free shared IRQ%d with NULL device ID\n",
+ irq);
goto out_unlock;
}
- if (action->flags & SA_STATIC_ALLOC)
- {
- /* This interrupt is marked as specially allocated
+ if (action->flags & SA_STATIC_ALLOC) {
+ /*
+ * This interrupt is marked as specially allocated
* so it is a bad idea to free it.
*/
- printk("Attempt to free statically allocated IRQ%d (%s)\n",
+ printk(KERN_ERR "Attempt to free statically allocated IRQ%d (%s)\n",
irq, action->name);
goto out_unlock;
}
-
+
if (tmp)
tmp->next = action->next;
else
@@ -203,21 +227,19 @@ out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
}
-extern void unexpected_irq(int, void *, struct pt_regs *);
-
-void sun4d_handler_irq(int pil, struct pt_regs * regs)
+void sun4d_handler_irq(int pil, struct pt_regs *regs)
{
struct pt_regs *old_regs;
- struct irqaction * action;
+ struct irqaction *action;
int cpu = smp_processor_id();
/* SBUS IRQ level (1 - 7) */
int sbusl = pil_to_sbus[pil];
-
+
/* FIXME: Is this necessary?? */
cc_get_ipen();
-
+
cc_set_iclr(1 << pil);
-
+
old_regs = set_irq_regs(regs);
irq_enter();
kstat_cpu(cpu).irqs[pil]++;
@@ -235,9 +257,9 @@ void sun4d_handler_irq(int pil, struct pt_regs * regs)
struct sbus_action *actionp;
unsigned mask, slot;
int sbil = (sbusl << 2);
-
+
bw_clear_intr_mask(sbusl, bus_mask);
-
+
/* Loop for each pending SBI */
for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
if (bus_mask & 1) {
@@ -249,7 +271,7 @@ void sun4d_handler_irq(int pil, struct pt_regs * regs)
if (mask & slot) {
mask &= ~slot;
action = actionp->action;
-
+
if (!action)
unexpected_irq(pil, NULL, regs);
do {
@@ -266,13 +288,13 @@ void sun4d_handler_irq(int pil, struct pt_regs * regs)
int sun4d_request_irq(unsigned int irq,
irq_handler_t handler,
- unsigned long irqflags, const char * devname, void *dev_id)
+ unsigned long irqflags, const char *devname, void *dev_id)
{
struct irqaction *action, *tmp = NULL, **actionp;
unsigned long flags;
int ret;
-
- if(irq > 14 && irq < (1 << 5)) {
+
+ if (irq > 14 && irq < (1 << 5)) {
ret = -EINVAL;
goto out;
}
@@ -289,7 +311,7 @@ int sun4d_request_irq(unsigned int irq,
else
actionp = irq + irq_action;
action = *actionp;
-
+
if (action) {
if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
for (tmp = action; tmp->next; tmp = tmp->next);
@@ -298,7 +320,8 @@ int sun4d_request_irq(unsigned int irq,
goto out_unlock;
}
if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
- printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
+ printk(KERN_ERR "Attempt to mix fast and slow interrupts on IRQ%d denied\n",
+ irq);
ret = -EBUSY;
goto out_unlock;
}
@@ -312,14 +335,14 @@ int sun4d_request_irq(unsigned int irq,
if (static_irq_count < MAX_STATIC_ALLOC)
action = &static_irqaction[static_irq_count++];
else
- printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
+ printk(KERN_ERR "Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
+ irq, devname);
}
-
+
if (action == NULL)
- action = kmalloc(sizeof(struct irqaction),
- GFP_ATOMIC);
-
- if (!action) {
+ action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
+
+ if (!action) {
ret = -ENOMEM;
goto out_unlock;
}
@@ -334,7 +357,7 @@ int sun4d_request_irq(unsigned int irq,
tmp->next = action;
else
*actionp = action;
-
+
__enable_irq(irq);
ret = 0;
@@ -348,7 +371,7 @@ static void sun4d_disable_irq(unsigned int irq)
{
int tid = sbus_tid[(irq >> 5) - 1];
unsigned long flags;
-
+
if (irq < NR_IRQS)
return;
@@ -361,7 +384,7 @@ static void sun4d_enable_irq(unsigned int irq)
{
int tid = sbus_tid[(irq >> 5) - 1];
unsigned long flags;
-
+
if (irq < NR_IRQS)
return;
@@ -411,7 +434,7 @@ void __init sun4d_distribute_irqs(void)
int board = of_getintprop_default(dp, "board#", 0);
if (sbus_tid[board] == 0xff) {
int i = 31;
-
+
if (cpus_empty(sbus_serving_map))
sbus_serving_map = cpu_present_map;
while (cpu_isset(i, sbus_serving_map))
@@ -423,7 +446,8 @@ void __init sun4d_distribute_irqs(void)
for_each_node_by_name(dp, "sbi") {
int devid = of_getintprop_default(dp, "device-id", 0);
int board = of_getintprop_default(dp, "board#", 0);
- printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
+ printk(KERN_ERR "sbus%d IRQs directed to CPU%d\n",
+ board, sbus_tid[board]);
set_sbi_tid(devid, sbus_tid[board] << 3);
}
#else
@@ -437,11 +461,11 @@ void __init sun4d_distribute_irqs(void)
sbus_tid[board] = cpuid;
set_sbi_tid(devid, cpuid << 3);
}
- printk("All sbus IRQs directed to CPU%d\n", cpuid);
+ printk(KERN_ERR "All sbus IRQs directed to CPU%d\n", cpuid);
#endif
}
#endif
-
+
static void sun4d_clear_clock_irq(void)
{
sbus_readl(&sun4d_timers->l10_timer_limit);
@@ -466,10 +490,7 @@ static void __init sun4d_fixup_trap_table(void)
{
#ifdef CONFIG_SMP
unsigned long flags;
- extern unsigned long lvl14_save[4];
struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
- extern unsigned int real_irq_entry[], smp4d_ticker[];
- extern unsigned int patchme_maybe_smp_msg[];
/* Adjust so that we jump directly to smp4d_ticker */
lvl14_save[2] += smp4d_ticker - real_irq_entry;
@@ -531,7 +552,8 @@ static void __init sun4d_init_timers(irq_handler_t counter_fn)
(IRQF_DISABLED | SA_STATIC_ALLOC),
"timer", NULL);
if (err) {
- prom_printf("sun4d_init_timers: request_irq() failed with %d\n", err);
+ prom_printf("sun4d_init_timers: request_irq() failed with %d\n",
+ err);
prom_halt();
}
sun4d_load_profile_irqs();
@@ -550,7 +572,7 @@ void __init sun4d_init_sbi_irq(void)
nsbi = 0;
for_each_node_by_name(dp, "sbi")
nsbi++;
- sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
+ sbus_actions = kzalloc(nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
if (!sbus_actions) {
prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
prom_halt();
@@ -566,7 +588,8 @@ void __init sun4d_init_sbi_irq(void)
/* Get rid of pending irqs from PROM */
mask = acquire_sbi(devid, 0xffffffff);
if (mask) {
- printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
+ printk(KERN_ERR "Clearing pending IRQs %08x on SBI %d\n",
+ mask, board);
release_sbi(devid, mask);
}
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-21 15:08:48 +0000