sparc32: Use PROM device probing for sun4c timers.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
arch/sparc/include/asm/timer_32.h | 24 ---------------
arch/sparc/kernel/sun4c_irq.c | 59 ++++++++++++++++++++++++------------
2 files changed, 39 insertions(+), 44 deletions(-)
diff --git a/arch/sparc/include/asm/timer_32.h b/arch/sparc/include/asm/timer_32.h
index 860a05e..351f257 100644
--- a/arch/sparc/include/asm/timer_32.h
+++ b/arch/sparc/include/asm/timer_32.h
@@ -11,30 +11,6 @@
#include <asm/system.h> /* For SUN4M_NCPUS */
#include <asm/btfixup.h>
-/* Timer structures. The interrupt timer has two properties which
- * are the counter (which is handled in do_timer in sched.c) and the limit.
- * This limit is where the timer's counter 'wraps' around. Oddly enough,
- * the sun4c timer when it hits the limit wraps back to 1 and not zero
- * thus when calculating the value at which it will fire a microsecond you
- * must adjust by one. Thanks SUN for designing such great hardware ;(
- */
-
-/* Note that I am only going to use the timer that interrupts at
- * Sparc IRQ 10. There is another one available that can fire at
- * IRQ 14. Currently it is left untouched, we keep the PROM's limit
- * register value and let the prom take these interrupts. This allows
- * L1-A to work.
- */
-
-struct sun4c_timer_info {
- __volatile__ unsigned int cur_count10;
- __volatile__ unsigned int timer_limit10;
- __volatile__ unsigned int cur_count14;
- __volatile__ unsigned int timer_limit14;
-};
-
-#define SUN_TIMER_PHYSADDR 0xf3000000
-
extern __volatile__ unsigned int *master_l10_counter;
extern __volatile__ unsigned int *master_l10_limit;
diff --git a/arch/sparc/kernel/sun4c_irq.c b/arch/sparc/kernel/sun4c_irq.c
index 8033132..92096ba 100644
--- a/arch/sparc/kernel/sun4c_irq.c
+++ b/arch/sparc/kernel/sun4c_irq.c
@@ -119,16 +119,18 @@ static void sun4c_enable_irq(unsigned int irq_nr)
local_irq_restore(flags);
}
-#define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
-#define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
+struct sun4c_timer_info {
+ u32 l10_count;
+ u32 l10_limit;
+ u32 l14_count;
+ u32 l14_limit;
+};
-volatile struct sun4c_timer_info *sun4c_timers;
+static struct sun4c_timer_info __iomem *sun4c_timers;
static void sun4c_clear_clock_irq(void)
{
- volatile unsigned int clear_intr;
-
- clear_intr = sun4c_timers->timer_limit10;
+ sbus_readl(&sun4c_timers->l10_limit);
}
static void sun4c_load_profile_irq(int cpu, unsigned int limit)
@@ -138,32 +140,49 @@ static void sun4c_load_profile_irq(int cpu, unsigned int limit)
static void __init sun4c_init_timers(irq_handler_t counter_fn)
{
- int irq;
+ const struct linux_prom_irqs *irq;
+ struct device_node *dp;
+ const u32 *addr;
+ int err;
- /* Map the Timer chip, this is implemented in hardware inside
- * the cache chip on the sun4c.
- */
- sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
- sizeof(struct sun4c_timer_info));
+ dp = of_find_node_by_name(NULL, "counter-timer");
+ if (!dp) {
+ prom_printf("sun4c_init_timers: Unable to find counter-timer\n");
+ prom_halt();
+ }
+
+ addr = of_get_property(dp, "address", NULL);
+ if (!addr) {
+ prom_printf("sun4c_init_timers: No address property\n");
+ prom_halt();
+ }
+
+ sun4c_timers = (void __iomem *) (unsigned long) addr[0];
+
+ irq = of_get_property(dp, "intr", NULL);
+ if (!irq) {
+ prom_printf("sun4c_init_timers: No intr property\n");
+ prom_halt();
+ }
/* Have the level 10 timer tick at 100HZ. We don't touch the
* level 14 timer limit since we are letting the prom handle
* them until we have a real console driver so L1-A works.
*/
- sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
- master_l10_counter = &sun4c_timers->cur_count10;
- master_l10_limit = &sun4c_timers->timer_limit10;
+ sbus_writel((((1000000/HZ) + 1) << 10), &sun4c_timers->l10_limit);
+
+ master_l10_counter = &sun4c_timers->l10_count;
+ master_l10_limit = &sun4c_timers->l10_limit;
- irq = request_irq(TIMER_IRQ,
- counter_fn,
+ err = request_irq(irq[0].pri, 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("sun4c_init_timers: request_irq() fails with %d\n", err);
prom_halt();
}
- sun4c_disable_irq(PROFILE_IRQ);
+ sun4c_disable_irq(irq[1].pri);
}
#ifdef CONFIG_SMP
--
1.5.6.5
--
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