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authorAlexander Shiyan <shc_work@mail.ru>2013-05-13 21:07:32 +0400
committerOlof Johansson <olof@lixom.net>2013-06-11 15:47:35 -0700
commitc99f72addbf5c0ad37d5a9b26f99208464d35f5c (patch)
treef86803ce60ba8969740b51e71aa26d8685d5468a /arch/arm/mach-clps711x
parentd0ad52a6fa9018d18076a887898f7912ae91f246 (diff)
downloadop-kernel-dev-c99f72addbf5c0ad37d5a9b26f99208464d35f5c.zip
op-kernel-dev-c99f72addbf5c0ad37d5a9b26f99208464d35f5c.tar.gz
ARM: clps711x: Add clocksource framework
Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-clps711x')
-rw-r--r--arch/arm/mach-clps711x/common.c48
1 files changed, 40 insertions, 8 deletions
diff --git a/arch/arm/mach-clps711x/common.c b/arch/arm/mach-clps711x/common.c
index 768d41c6..bd65839 100644
--- a/arch/arm/mach-clps711x/common.c
+++ b/arch/arm/mach-clps711x/common.c
@@ -27,12 +27,14 @@
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clockchips.h>
+#include <linux/clocksource.h>
#include <linux/clk-provider.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
+#include <asm/sched_clock.h>
#include <asm/system_misc.h>
#include <mach/hardware.h>
@@ -251,13 +253,32 @@ asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
handle_IRQ(fls16(irqstat) + 16, regs);
}
+static u32 notrace clps711x_sched_clock_read(void)
+{
+ return ~readw_relaxed(CLPS711X_VIRT_BASE + TC1D);
+}
+
static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
+ disable_irq(IRQ_TC2OI);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ enable_irq(IRQ_TC2OI);
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ /* Not supported */
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_RESUME:
+ /* Left event sources disabled, no more interrupts appear */
+ break;
+ }
}
static struct clock_event_device clockevent_clps711x = {
- .name = "CLPS711x Clockevents",
+ .name = "clps711x-clockevent",
.rating = 300,
.features = CLOCK_EVT_FEAT_PERIODIC,
.set_mode = clps711x_clockevent_set_mode,
@@ -271,8 +292,8 @@ static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id)
}
static struct irqaction clps711x_timer_irq = {
- .name = "CLPS711x Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .name = "clps711x-timer",
+ .flags = IRQF_TIMER | IRQF_IRQPOLL,
.handler = clps711x_timer_interrupt,
};
@@ -320,9 +341,9 @@ void __init clps711x_timer_init(void)
else
timh = 541440;
} else
- timh = cpu / 144;
+ timh = DIV_ROUND_CLOSEST(cpu, 144);
- timl = timh / 256;
+ timl = DIV_ROUND_CLOSEST(timh, 256);
/* All clocks are fixed */
add_fixed_clk(clk_pll, "pll", pll);
@@ -335,13 +356,24 @@ void __init clps711x_timer_init(void)
pr_info("CPU frequency set at %i Hz.\n", cpu);
+ /* Start Timer1 in free running mode (Low frequency) */
+ tmp = clps_readl(SYSCON1) & ~(SYSCON1_TC1S | SYSCON1_TC1M);
+ clps_writel(tmp, SYSCON1);
+
+ setup_sched_clock(clps711x_sched_clock_read, 16, timl);
+
+ clocksource_mmio_init(CLPS711X_VIRT_BASE + TC1D,
+ "clps711x_clocksource", timl, 300, 16,
+ clocksource_mmio_readw_down);
+
+ /* Set Timer2 prescaler */
clps_writew(DIV_ROUND_CLOSEST(timh, HZ), TC2D);
- tmp = clps_readl(SYSCON1);
- tmp |= SYSCON1_TC2S | SYSCON1_TC2M;
+ /* Start Timer2 in prescale mode (High frequency)*/
+ tmp = clps_readl(SYSCON1) | SYSCON1_TC2M | SYSCON1_TC2S;
clps_writel(tmp, SYSCON1);
- clockevents_config_and_register(&clockevent_clps711x, timh, 1, 0xffff);
+ clockevents_config_and_register(&clockevent_clps711x, timh, 0, 0);
setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
}
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