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| author | Alexander Shiyan <shc_work@mail.ru> | 2013-05-13 21:07:32 +0400 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-06-12 02:47:35 +0400 |
| commit | c99f72addbf5c0ad37d5a9b26f99208464d35f5c (patch) | |
| tree | f86803ce60ba8969740b51e71aa26d8685d5468a /arch | |
| parent | d0ad52a6fa9018d18076a887898f7912ae91f246 (diff) | |
| download | linux-c99f72addbf5c0ad37d5a9b26f99208464d35f5c.tar.xz | |
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')
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-clps711x/common.c | 48 |
2 files changed, 41 insertions, 8 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index c7e2a88b2691..fc93deb1baaf 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -366,6 +366,7 @@ config ARCH_CLPS711X select ARCH_REQUIRE_GPIOLIB select AUTO_ZRELADDR select CLKDEV_LOOKUP + select CLKSRC_MMIO select COMMON_CLK select CPU_ARM720T select GENERIC_CLOCKEVENTS diff --git a/arch/arm/mach-clps711x/common.c b/arch/arm/mach-clps711x/common.c index 768d41c68cea..bd658398a819 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); } |