sparc32: Use PROM infrastructure for probing and mapping sun4d timers.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
arch/sparc/include/asm/timer_32.h | 13 ----
arch/sparc/kernel/sun4d_irq.c | 139 ++++++++++++++++++++++---------------
2 files changed, 83 insertions(+), 69 deletions(-)
diff --git a/arch/sparc/include/asm/timer_32.h b/arch/sparc/include/asm/timer_32.h
index 8906e98..860a05e 100644
--- a/arch/sparc/include/asm/timer_32.h
+++ b/arch/sparc/include/asm/timer_32.h
@@ -35,19 +35,6 @@ struct sun4c_timer_info {
#define SUN_TIMER_PHYSADDR 0xf3000000
-#define SUN4D_PRM_CNT_L 0x80000000
-#define SUN4D_PRM_CNT_LVALUE 0x7FFFFC00
-
-struct sun4d_timer_regs {
- volatile unsigned int l10_timer_limit;
- volatile unsigned int l10_cur_countx;
- volatile unsigned int l10_limit_noclear;
- volatile unsigned int ctrl;
- volatile unsigned int l10_cur_count;
-};
-
-extern struct sun4d_timer_regs *sun4d_timers;
-
extern __volatile__ unsigned int *master_l10_counter;
extern __volatile__ unsigned int *master_l10_limit;
diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
index 12541f5..4156bf6 100644
--- a/arch/sparc/kernel/sun4d_irq.c
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -45,7 +45,16 @@
/* 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 *sun4d_timers;
+struct sun4d_timer_regs {
+ u32 l10_timer_limit;
+ u32 l10_cur_countx;
+ u32 l10_limit_noclear;
+ u32 ctrl;
+ u32 l10_cur_count;
+};
+
+static struct sun4d_timer_regs __iomem *sun4d_timers;
+
#define TIMER_IRQ 10
#define MAX_STATIC_ALLOC 4
@@ -446,8 +455,7 @@ void __init sun4d_distribute_irqs(void)
static void sun4d_clear_clock_irq(void)
{
- volatile unsigned int clear_intr;
- clear_intr = sun4d_timers->l10_timer_limit;
+ sbus_readl(&sun4d_timers->l10_timer_limit);
}
static void sun4d_clear_profile_irq(int cpu)
@@ -460,71 +468,90 @@ static void sun4d_load_profile_irq(int cpu, unsigned int limit)
bw_set_prof_limit(cpu, limit);
}
-static void __init sun4d_init_timers(irq_handler_t counter_fn)
+static void __init sun4d_load_profile_irqs(void)
{
- int irq;
- int cpu;
- struct resource r;
- int mid;
+ int cpu = 0, mid;
- /* Map the User Timer registers. */
- memset(&r, 0, sizeof(r));
+ while (!cpu_find_by_instance(cpu, NULL, &mid)) {
+ sun4d_load_profile_irq(mid >> 3, 0);
+ cpu++;
+ }
+}
+
+static void __init sun4d_fixup_trap_table(void)
+{
#ifdef CONFIG_SMP
- r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
-#else
- r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
+ 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;
+
+ /* For SMP we use the level 14 ticker, however the bootup code
+ * has copied the firmware's level 14 vector into the boot cpu's
+ * trap table, we must fix this now or we get squashed.
+ */
+ local_irq_save(flags);
+ patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
+ trap_table->inst_one = lvl14_save[0];
+ trap_table->inst_two = lvl14_save[1];
+ trap_table->inst_three = lvl14_save[2];
+ trap_table->inst_four = lvl14_save[3];
+ local_flush_cache_all();
+ local_irq_restore(flags);
#endif
- r.flags = 0xf;
- sun4d_timers = (struct sun4d_timer_regs *) of_ioremap(&r, 0,
- PAGE_SIZE, "user timer");
+}
+
+static void __init sun4d_init_timers(irq_handler_t counter_fn)
+{
+ struct device_node *dp;
+ struct resource res;
+ const u32 *reg;
+ int err;
+
+ dp = of_find_node_by_name(NULL, "cpu-unit");
+ if (!dp) {
+ prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
+ prom_halt();
+ }
+
+ /* Which cpu-unit we use is arbitrary, we can view the bootbus timer
+ * registers via any cpu's mapping. The first 'reg' property is the
+ * bootbus.
+ */
+ reg = of_get_property(dp, "reg", NULL);
+ if (!reg) {
+ prom_printf("sun4d_init_timers: No reg property\n");
+ prom_halt();
+ }
+
+ res.start = reg[1];
+ res.end = reg[2] - 1;
+ res.flags = reg[0] & 0xff;
+ sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
+ sizeof(struct sun4d_timer_regs), "user timer");
+ if (!sun4d_timers) {
+ prom_printf("sun4d_init_timers: Can't map timer regs\n");
+ prom_halt();
+ }
+
+ sbus_writel((((1000000/HZ) + 1) << 10), &sun4d_timers->l10_timer_limit);
- sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
master_l10_counter = &sun4d_timers->l10_cur_count;
master_l10_limit = &sun4d_timers->l10_timer_limit;
- irq = request_irq(TIMER_IRQ,
- counter_fn,
+ err = request_irq(TIMER_IRQ, counter_fn,
(IRQF_DISABLED | SA_STATIC_ALLOC),
"timer", NULL);
- if (irq) {
- prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
+ if (err) {
+ prom_printf("sun4d_init_timers: request_irq() failed with %d\n", err);
prom_halt();
}
-
- /* Enable user timer free run for CPU 0 in BW */
- /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
-
- cpu = 0;
- while (!cpu_find_by_instance(cpu, NULL, &mid)) {
- sun4d_load_profile_irq(mid >> 3, 0);
- cpu++;
- }
-
-#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;
-
- /* For SMP we use the level 14 ticker, however the bootup code
- * has copied the firmware's level 14 vector into the boot cpu's
- * trap table, we must fix this now or we get squashed.
- */
- local_irq_save(flags);
- patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
- trap_table->inst_one = lvl14_save[0];
- trap_table->inst_two = lvl14_save[1];
- trap_table->inst_three = lvl14_save[2];
- trap_table->inst_four = lvl14_save[3];
- local_flush_cache_all();
- local_irq_restore(flags);
- }
-#endif
+ sun4d_load_profile_irqs();
+ sun4d_fixup_trap_table();
}
void __init sun4d_init_sbi_irq(void)
--
1.5.6.5
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