[MIPS] pnx8xxx: move to clocksource

This patch converts PNX8XXX system timer to clocksource restoring PNX8550
support back to live.

Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 72 insertions, 37 deletions

diff --git a/arch/mips/philips/pnx8550/common/time.c b/arch/mips/philips/pnx8550/common/time.c
index e818fd0f1584..6d494e0de3d9 100644
--- a/arch/mips/philips/pnx8550/common/time.c
+++ b/arch/mips/philips/pnx8550/common/time.c
@@ -22,7 +22,6 @@
 #include <linux/kernel_stat.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
 
 #include <asm/bootinfo.h>
 #include <asm/cpu.h>
@@ -41,11 +40,60 @@ static cycle_t hpt_read(void)
         return read_c0_count2();
 }
 
+static struct clocksource pnx_clocksource = {
+        .name           = "pnx8xxx",
+        .rating         = 200,
+        .read           = hpt_read,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
 static void timer_ack(void)
 {
         write_c0_compare(cpj);
 }
 
+static irqreturn_t pnx8xxx_timer_interrupt(int irq, void *dev_id)
+{
+        struct clock_event_device *c = dev_id;
+
+        /* clear MATCH, signal the event */
+        c->event_handler(c);
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction pnx8xxx_timer_irq = {
+        .handler        = pnx8xxx_timer_interrupt,
+        .flags          = IRQF_DISABLED | IRQF_PERCPU,
+        .name           = "pnx8xxx_timer",
+};
+
+static irqreturn_t monotonic_interrupt(int irq, void *dev_id)
+{
+        /* Timer 2 clear interrupt */
+        write_c0_compare2(-1);
+        return IRQ_HANDLED;
+}
+
+static struct irqaction monotonic_irqaction = {
+        .handler = monotonic_interrupt,
+        .flags = IRQF_DISABLED,
+        .name = "Monotonic timer",
+};
+
+static int pnx8xxx_set_next_event(unsigned long delta,
+                                struct clock_event_device *evt)
+{
+        write_c0_compare(delta);
+        return 0;
+}
+
+static struct clock_event_device pnx8xxx_clockevent = {
+        .name           = "pnx8xxx_clockevent",
+        .features       = CLOCK_EVT_FEAT_ONESHOT,
+        .set_next_event = pnx8xxx_set_next_event,
+};
+
 /*
  * plat_time_init() - it does the following things:
  *
@@ -58,11 +106,34 @@ static void timer_ack(void)
 
 __init void plat_time_init(void)
 {
+        unsigned int             configPR;
         unsigned int             n;
         unsigned int             m;
         unsigned int             p;
         unsigned int             pow2p;
 
+        clockevents_register_device(&pnx8xxx_clockevent);
+        clocksource_register(&pnx_clocksource);
+
+        setup_irq(PNX8550_INT_TIMER1, &pnx8xxx_timer_irq);
+        setup_irq(PNX8550_INT_TIMER2, &monotonic_irqaction);
+
+        /* Timer 1 start */
+        configPR = read_c0_config7();
+        configPR &= ~0x00000008;
+        write_c0_config7(configPR);
+
+        /* Timer 2 start */
+        configPR = read_c0_config7();
+        configPR &= ~0x00000010;
+        write_c0_config7(configPR);
+
+        /* Timer 3 stop */
+        configPR = read_c0_config7();
+        configPR |= 0x00000020;
+        write_c0_config7(configPR);
+
+
         /* PLL0 sets MIPS clock (PLL1 <=> TM1, PLL6 <=> TM2, PLL5 <=> mem) */
         /* (but only if CLK_MIPS_CTL select value [bits 3:1] is 1:  FIXME) */
 
@@ -87,42 +158,6 @@ __init void plat_time_init(void)
         write_c0_count2(0);
         write_c0_compare2(0xffffffff);
 
-        clocksource_mips.read = hpt_read;
-        mips_timer_ack = timer_ack;
-}
-
-static irqreturn_t monotonic_interrupt(int irq, void *dev_id)
-{
-        /* Timer 2 clear interrupt */
-        write_c0_compare2(-1);
-        return IRQ_HANDLED;
 }
 
-static struct irqaction monotonic_irqaction = {
-        .handler = monotonic_interrupt,
-        .flags = IRQF_DISABLED,
-        .name = "Monotonic timer",
-};
 
-void __init plat_timer_setup(struct irqaction *irq)
-{
-        int configPR;
-
-        setup_irq(PNX8550_INT_TIMER1, irq);
-        setup_irq(PNX8550_INT_TIMER2, &monotonic_irqaction);
-
-        /* Timer 1 start */
-        configPR = read_c0_config7();
-        configPR &= ~0x00000008;
-        write_c0_config7(configPR);
-
-        /* Timer 2 start */
-        configPR = read_c0_config7();
-        configPR &= ~0x00000010;
-        write_c0_config7(configPR);
-
-        /* Timer 3 stop */
-        configPR = read_c0_config7();
-        configPR |= 0x00000020;
-        write_c0_config7(configPR);
-}