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openwrt-owl/target/linux/gemini/patches-3.18/160-gemini-timers.patch

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--- a/arch/arm/mach-gemini/time.c
+++ b/arch/arm/mach-gemini/time.c
@@ -15,15 +15,18 @@
#include <asm/mach/time.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
/*
* Register definitions for the timers
*/
-#define TIMER_COUNT(BASE_ADDR) (BASE_ADDR + 0x00)
-#define TIMER_LOAD(BASE_ADDR) (BASE_ADDR + 0x04)
-#define TIMER_MATCH1(BASE_ADDR) (BASE_ADDR + 0x08)
-#define TIMER_MATCH2(BASE_ADDR) (BASE_ADDR + 0x0C)
-#define TIMER_CR(BASE_ADDR) (BASE_ADDR + 0x30)
+#define TIMER_COUNT(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x00)
+#define TIMER_LOAD(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x04)
+#define TIMER_MATCH1(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x08)
+#define TIMER_MATCH2(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x0C)
+#define TIMER_CR(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x30)
+#define TIMER_INTR_STATE(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x34)
+#define TIMER_INTR_MASK(BASE_ADDR) (IO_ADDRESS(BASE_ADDR) + 0x38)
#define TIMER_1_CR_ENABLE (1 << 0)
#define TIMER_1_CR_CLOCK (1 << 1)
@@ -34,27 +37,38 @@
#define TIMER_3_CR_ENABLE (1 << 6)
#define TIMER_3_CR_CLOCK (1 << 7)
#define TIMER_3_CR_INT (1 << 8)
+#define TIMER_1_CR_UPDOWN (1 << 9)
+#define TIMER_2_CR_UPDOWN (1 << 10)
+#define TIMER_3_CR_UPDOWN (1 << 11)
+
+#define TIMER_1_INT_MATCH1 (1 << 0)
+#define TIMER_1_INT_MATCH2 (1 << 1)
+#define TIMER_1_INT_OVERFLOW (1 << 2)
+#define TIMER_2_INT_MATCH1 (1 << 3)
+#define TIMER_2_INT_MATCH2 (1 << 4)
+#define TIMER_2_INT_OVERFLOW (1 << 5)
+#define TIMER_3_INT_MATCH1 (1 << 6)
+#define TIMER_3_INT_MATCH2 (1 << 7)
+#define TIMER_3_INT_OVERFLOW (1 << 8)
+#define TIMER_INT_ALL_MASK 0x1ff
static unsigned int tick_rate;
+static u64 notrace gemini_read_sched_clock(void)
+{
+ return readl(TIMER_COUNT(GEMINI_TIMER3_BASE));
+}
+
static int gemini_timer_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
u32 cr;
- cr = readl(TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
-
- /* This may be overdoing it, feel free to test without this */
- cr &= ~TIMER_2_CR_ENABLE;
- cr &= ~TIMER_2_CR_INT;
- writel(cr, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
-
- /* Set next event */
- writel(cycles, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE)));
- writel(cycles, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE)));
- cr |= TIMER_2_CR_ENABLE;
- cr |= TIMER_2_CR_INT;
- writel(cr, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
+ /* Setup the match register */
+ cr = readl(TIMER_COUNT(GEMINI_TIMER1_BASE));
+ writel(cr + cycles, TIMER_MATCH1(GEMINI_TIMER1_BASE));
+ if (readl(TIMER_COUNT(GEMINI_TIMER1_BASE)) - cr > cycles)
+ return -ETIME;
return 0;
}
@@ -66,48 +80,68 @@ static void gemini_timer_set_mode(enum c
u32 cr;
switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- /* Start the timer */
- writel(period,
- TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE)));
- writel(period,
- TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE)));
- cr = readl(TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
- cr |= TIMER_2_CR_ENABLE;
- cr |= TIMER_2_CR_INT;
- writel(cr, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
+ case CLOCK_EVT_MODE_PERIODIC:
+ /* Stop timer and interrupt. */
+ cr = readl(TIMER_CR(GEMINI_TIMER_BASE));
+ cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
+ writel(cr, TIMER_CR(GEMINI_TIMER_BASE));
+
+ /* Setup timer to fire at 1/HZ intervals. */
+ cr = 0xffffffff - (period - 1);
+ writel(cr, TIMER_COUNT(GEMINI_TIMER1_BASE));
+ writel(cr, TIMER_LOAD(GEMINI_TIMER1_BASE));
+
+ /* enable interrupt on overflaw */
+ cr = readl(TIMER_INTR_MASK(GEMINI_TIMER_BASE));
+ cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2);
+ cr |= TIMER_1_INT_OVERFLOW;
+ writel(cr, TIMER_INTR_MASK(GEMINI_TIMER_BASE));
+
+ /* start the timer */
+ cr = readl(TIMER_CR(GEMINI_TIMER_BASE));
+ cr |= TIMER_1_CR_ENABLE | TIMER_1_CR_INT;
+ writel(cr, TIMER_CR(GEMINI_TIMER_BASE));
break;
+
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ /* Stop timer and interrupt. */
+ cr = readl(TIMER_CR(GEMINI_TIMER_BASE));
+ cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
+ writel(cr, TIMER_CR(GEMINI_TIMER_BASE));
+
+ /* Setup counter start from 0 */
+ writel(0, TIMER_COUNT(GEMINI_TIMER1_BASE));
+ writel(0, TIMER_LOAD(GEMINI_TIMER1_BASE));
+
+ /* enable interrupt */
+ cr = readl(TIMER_INTR_MASK(GEMINI_TIMER_BASE));
+ cr &= ~(TIMER_1_INT_OVERFLOW | TIMER_1_INT_MATCH2);
+ cr |= TIMER_1_INT_MATCH1;
+ writel(cr, TIMER_INTR_MASK(GEMINI_TIMER_BASE));
+
+ /* start the timer */
+ cr = readl(TIMER_CR(GEMINI_TIMER_BASE));
+ cr |= TIMER_1_CR_ENABLE;
+ writel(cr, TIMER_CR(GEMINI_TIMER_BASE));
+ break;
+
case CLOCK_EVT_MODE_RESUME:
- /*
- * Disable also for oneshot: the set_next() call will
- * arm the timer instead.
- */
- cr = readl(TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
- cr &= ~TIMER_2_CR_ENABLE;
- cr &= ~TIMER_2_CR_INT;
- writel(cr, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
break;
- default:
- break;
}
}
-/* Use TIMER2 as clock event */
static struct clock_event_device gemini_clockevent = {
- .name = "TIMER2",
- .rating = 300, /* Reasonably fast and accurate clock event */
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- .set_next_event = gemini_timer_set_next_event,
- .set_mode = gemini_timer_set_mode,
+ .name = "gemini_timer_1",
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .shift = 32,
+ .rating = 300,
+ .set_next_event = gemini_timer_set_next_event,
+ .set_mode = gemini_timer_set_mode,
};
-/*
- * IRQ handler for the timer
- */
-static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id)
+static irqreturn_t gemini_timer_intr(int irq, void *dev_id)
{
struct clock_event_device *evt = &gemini_clockevent;
@@ -116,14 +150,11 @@ static irqreturn_t gemini_timer_interrup
}
static struct irqaction gemini_timer_irq = {
- .name = "Gemini Timer Tick",
- .flags = IRQF_TIMER,
- .handler = gemini_timer_interrupt,
+ .name = "gemini timer 1",
+ .flags = IRQF_DISABLED | IRQF_TIMER,
+ .handler = gemini_timer_intr,
};
-/*
- * Set up timer interrupt, and return the current time in seconds.
- */
void __init gemini_timer_init(void)
{
u32 reg_v;
@@ -151,20 +182,35 @@ void __init gemini_timer_init(void)
}
/*
- * Make irqs happen for the system timer
+ * Reset the interrupt mask and status
*/
- setup_irq(IRQ_TIMER2, &gemini_timer_irq);
+ writel(TIMER_INT_ALL_MASK, TIMER_INTR_MASK(GEMINI_TIMER_BASE));
+ writel(0, TIMER_INTR_STATE(GEMINI_TIMER_BASE));
+ writel(TIMER_1_CR_UPDOWN | TIMER_3_CR_ENABLE | TIMER_3_CR_UPDOWN,
+ TIMER_CR(GEMINI_TIMER_BASE));
- /* Enable and use TIMER1 as clock source */
- writel(0xffffffff, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER1_BASE)));
- writel(0xffffffff, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER1_BASE)));
- writel(TIMER_1_CR_ENABLE, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
- if (clocksource_mmio_init(TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER1_BASE)),
- "TIMER1", tick_rate, 300, 32,
- clocksource_mmio_readl_up))
- pr_err("timer: failed to initialize gemini clock source\n");
+ /*
+ * Setup free-running clocksource timer (interrupts
+ * disabled.)
+ */
+ writel(0, TIMER_COUNT(GEMINI_TIMER3_BASE));
+ writel(0, TIMER_LOAD(GEMINI_TIMER3_BASE));
+ writel(0, TIMER_MATCH1(GEMINI_TIMER3_BASE));
+ writel(0, TIMER_MATCH2(GEMINI_TIMER3_BASE));
+ clocksource_mmio_init(TIMER_COUNT(GEMINI_TIMER3_BASE),
+ "gemini_clocksource", tick_rate,
+ 300, 32, clocksource_mmio_readl_up);
+ sched_clock_register(gemini_read_sched_clock, 32, tick_rate);
- /* Configure and register the clockevent */
+ /*
+ * Setup clockevent timer (interrupt-driven.)
+ */
+ writel(0, TIMER_COUNT(GEMINI_TIMER1_BASE));
+ writel(0, TIMER_LOAD(GEMINI_TIMER1_BASE));
+ writel(0, TIMER_MATCH1(GEMINI_TIMER1_BASE));
+ writel(0, TIMER_MATCH2(GEMINI_TIMER1_BASE));
+ setup_irq(IRQ_TIMER1, &gemini_timer_irq);
+ gemini_clockevent.cpumask = cpumask_of(0);
clockevents_config_and_register(&gemini_clockevent, tick_rate,
1, 0xffffffff);
}
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