diff options
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/Makefile | 2 | ||||
| -rw-r--r-- | drivers/clocksource/clksrc-dbx500-prcmu.c | 3 | ||||
| -rw-r--r-- | drivers/clocksource/nomadik-mtu.c | 4 | ||||
| -rw-r--r-- | drivers/clocksource/timer-marco.c | 299 | ||||
| -rw-r--r-- | drivers/clocksource/timer-prima2.c | 215 |
5 files changed, 518 insertions, 5 deletions
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 4897f243a000..682d48d08164 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -16,7 +16,9 @@ obj-$(CONFIG_CLKSRC_NOMADIK_MTU) += nomadik-mtu.o obj-$(CONFIG_CLKSRC_DBX500_PRCMU) += clksrc-dbx500-prcmu.o obj-$(CONFIG_ARMADA_370_XP_TIMER) += time-armada-370-xp.o obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o +obj-$(CONFIG_ARCH_MARCO) += timer-marco.o obj-$(CONFIG_ARCH_MXS) += mxs_timer.o +obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c index c26c369eb9e6..54f3d119d99c 100644 --- a/drivers/clocksource/clksrc-dbx500-prcmu.c +++ b/drivers/clocksource/clksrc-dbx500-prcmu.c @@ -17,9 +17,6 @@ #include <asm/sched_clock.h> -#include <mach/setup.h> -#include <mach/hardware.h> - #define RATE_32K 32768 #define TIMER_MODE_CONTINOUS 0x1 diff --git a/drivers/clocksource/nomadik-mtu.c b/drivers/clocksource/nomadik-mtu.c index 071f6eadfea2..e405531e1cc5 100644 --- a/drivers/clocksource/nomadik-mtu.c +++ b/drivers/clocksource/nomadik-mtu.c @@ -67,7 +67,7 @@ static u32 clk_prescale; static u32 nmdk_cycle; /* write-once */ static struct delay_timer mtu_delay_timer; -#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK +#ifdef CONFIG_CLKSRC_NOMADIK_MTU_SCHED_CLOCK /* * Override the global weak sched_clock symbol with this * local implementation which uses the clocksource to get some @@ -233,7 +233,7 @@ void __init nmdk_timer_init(void __iomem *base, int irq) pr_err("timer: failed to initialize clock source %s\n", "mtu_0"); -#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK +#ifdef CONFIG_CLKSRC_NOMADIK_MTU_SCHED_CLOCK setup_sched_clock(nomadik_read_sched_clock, 32, rate); #endif diff --git a/drivers/clocksource/timer-marco.c b/drivers/clocksource/timer-marco.c new file mode 100644 index 000000000000..97738dbf3e3b --- /dev/null +++ b/drivers/clocksource/timer-marco.c @@ -0,0 +1,299 @@ +/* + * System timer for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/clockchips.h> +#include <linux/clocksource.h> +#include <linux/bitops.h> +#include <linux/irq.h> +#include <linux/clk.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <asm/sched_clock.h> +#include <asm/localtimer.h> +#include <asm/mach/time.h> + +#define SIRFSOC_TIMER_32COUNTER_0_CTRL 0x0000 +#define SIRFSOC_TIMER_32COUNTER_1_CTRL 0x0004 +#define SIRFSOC_TIMER_MATCH_0 0x0018 +#define SIRFSOC_TIMER_MATCH_1 0x001c +#define SIRFSOC_TIMER_COUNTER_0 0x0048 +#define SIRFSOC_TIMER_COUNTER_1 0x004c +#define SIRFSOC_TIMER_INTR_STATUS 0x0060 +#define SIRFSOC_TIMER_WATCHDOG_EN 0x0064 +#define SIRFSOC_TIMER_64COUNTER_CTRL 0x0068 +#define SIRFSOC_TIMER_64COUNTER_LO 0x006c +#define SIRFSOC_TIMER_64COUNTER_HI 0x0070 +#define SIRFSOC_TIMER_64COUNTER_LOAD_LO 0x0074 +#define SIRFSOC_TIMER_64COUNTER_LOAD_HI 0x0078 +#define SIRFSOC_TIMER_64COUNTER_RLATCHED_LO 0x007c +#define SIRFSOC_TIMER_64COUNTER_RLATCHED_HI 0x0080 + +#define SIRFSOC_TIMER_REG_CNT 6 + +static const u32 sirfsoc_timer_reg_list[SIRFSOC_TIMER_REG_CNT] = { + SIRFSOC_TIMER_WATCHDOG_EN, + SIRFSOC_TIMER_32COUNTER_0_CTRL, + SIRFSOC_TIMER_32COUNTER_1_CTRL, + SIRFSOC_TIMER_64COUNTER_CTRL, + SIRFSOC_TIMER_64COUNTER_RLATCHED_LO, + SIRFSOC_TIMER_64COUNTER_RLATCHED_HI, +}; + +static u32 sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT]; + +static void __iomem *sirfsoc_timer_base; + +/* disable count and interrupt */ +static inline void sirfsoc_timer_count_disable(int idx) +{ + writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) & ~0x7, + sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx); +} + +/* enable count and interrupt */ +static inline void sirfsoc_timer_count_enable(int idx) +{ + writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) | 0x7, + sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx); +} + +/* timer interrupt handler */ +static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *ce = dev_id; + int cpu = smp_processor_id(); + + /* clear timer interrupt */ + writel_relaxed(BIT(cpu), sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS); + + if (ce->mode == CLOCK_EVT_MODE_ONESHOT) + sirfsoc_timer_count_disable(cpu); + + ce->event_handler(ce); + + return IRQ_HANDLED; +} + +/* read 64-bit timer counter */ +static cycle_t sirfsoc_timer_read(struct clocksource *cs) +{ + u64 cycles; + + writel_relaxed((readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) | + BIT(0)) & ~BIT(1), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); + + cycles = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_RLATCHED_HI); + cycles = (cycles << 32) | readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_RLATCHED_LO); + + return cycles; +} + +static int sirfsoc_timer_set_next_event(unsigned long delta, + struct clock_event_device *ce) +{ + int cpu = smp_processor_id(); + + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_0 + + 4 * cpu); + writel_relaxed(delta, sirfsoc_timer_base + SIRFSOC_TIMER_MATCH_0 + + 4 * cpu); + + /* enable the tick */ + sirfsoc_timer_count_enable(cpu); + + return 0; +} + +static void sirfsoc_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *ce) +{ + switch (mode) { + case CLOCK_EVT_MODE_ONESHOT: + /* enable in set_next_event */ + break; + default: + break; + } + + sirfsoc_timer_count_disable(smp_processor_id()); +} + +static void sirfsoc_clocksource_suspend(struct clocksource *cs) +{ + int i; + + for (i = 0; i < SIRFSOC_TIMER_REG_CNT; i++) + sirfsoc_timer_reg_val[i] = readl_relaxed(sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); +} + +static void sirfsoc_clocksource_resume(struct clocksource *cs) +{ + int i; + + for (i = 0; i < SIRFSOC_TIMER_REG_CNT - 2; i++) + writel_relaxed(sirfsoc_timer_reg_val[i], sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); + + writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 2], + sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_LO); + writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 1], + sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_HI); + + writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) | + BIT(1) | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); +} + +static struct clock_event_device sirfsoc_clockevent = { + .name = "sirfsoc_clockevent", + .rating = 200, + .features = CLOCK_EVT_FEAT_ONESHOT, + .set_mode = sirfsoc_timer_set_mode, + .set_next_event = sirfsoc_timer_set_next_event, +}; + +static struct clocksource sirfsoc_clocksource = { + .name = "sirfsoc_clocksource", + .rating = 200, + .mask = CLOCKSOURCE_MASK(64), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .read = sirfsoc_timer_read, + .suspend = sirfsoc_clocksource_suspend, + .resume = sirfsoc_clocksource_resume, +}; + +static struct irqaction sirfsoc_timer_irq = { + .name = "sirfsoc_timer0", + .flags = IRQF_TIMER | IRQF_NOBALANCING, + .handler = sirfsoc_timer_interrupt, + .dev_id = &sirfsoc_clockevent, +}; + +#ifdef CONFIG_LOCAL_TIMERS + +static struct irqaction sirfsoc_timer1_irq = { + .name = "sirfsoc_timer1", + .flags = IRQF_TIMER | IRQF_NOBALANCING, + .handler = sirfsoc_timer_interrupt, +}; + +static int __cpuinit sirfsoc_local_timer_setup(struct clock_event_device *ce) +{ + /* Use existing clock_event for cpu 0 */ + if (!smp_processor_id()) + return 0; + + ce->irq = sirfsoc_timer1_irq.irq; + ce->name = "local_timer"; + ce->features = sirfsoc_clockevent.features; + ce->rating = sirfsoc_clockevent.rating; + ce->set_mode = sirfsoc_timer_set_mode; + ce->set_next_event = sirfsoc_timer_set_next_event; + ce->shift = sirfsoc_clockevent.shift; + ce->mult = sirfsoc_clockevent.mult; + ce->max_delta_ns = sirfsoc_clockevent.max_delta_ns; + ce->min_delta_ns = sirfsoc_clockevent.min_delta_ns; + + sirfsoc_timer1_irq.dev_id = ce; + BUG_ON(setup_irq(ce->irq, &sirfsoc_timer1_irq)); + irq_set_affinity(sirfsoc_timer1_irq.irq, cpumask_of(1)); + + clockevents_register_device(ce); + return 0; +} + +static void sirfsoc_local_timer_stop(struct clock_event_device *ce) +{ + sirfsoc_timer_count_disable(1); + + remove_irq(sirfsoc_timer1_irq.irq, &sirfsoc_timer1_irq); +} + +static struct local_timer_ops sirfsoc_local_timer_ops __cpuinitdata = { + .setup = sirfsoc_local_timer_setup, + .stop = sirfsoc_local_timer_stop, +}; +#endif /* CONFIG_LOCAL_TIMERS */ + +static void __init sirfsoc_clockevent_init(void) +{ + clockevents_calc_mult_shift(&sirfsoc_clockevent, CLOCK_TICK_RATE, 60); + + sirfsoc_clockevent.max_delta_ns = + clockevent_delta2ns(-2, &sirfsoc_clockevent); + sirfsoc_clockevent.min_delta_ns = + clockevent_delta2ns(2, &sirfsoc_clockevent); + + sirfsoc_clockevent.cpumask = cpumask_of(0); + clockevents_register_device(&sirfsoc_clockevent); +#ifdef CONFIG_LOCAL_TIMERS + local_timer_register(&sirfsoc_local_timer_ops); +#endif +} + +/* initialize the kernel jiffy timer source */ +static void __init sirfsoc_marco_timer_init(void) +{ + unsigned long rate; + u32 timer_div; + struct clk *clk; + + /* timer's input clock is io clock */ + clk = clk_get_sys("io", NULL); + + BUG_ON(IS_ERR(clk)); + rate = clk_get_rate(clk); + + BUG_ON(rate < CLOCK_TICK_RATE); + BUG_ON(rate % CLOCK_TICK_RATE); + + /* Initialize the timer dividers */ + timer_div = rate / CLOCK_TICK_RATE - 1; + writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); + writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL); + writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_1_CTRL); + + /* Initialize timer counters to 0 */ + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_LO); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_HI); + writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL) | + BIT(1) | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_0); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_1); + + /* Clear all interrupts */ + writel_relaxed(0xFFFF, sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS); + + BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE)); + + BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq)); + + sirfsoc_clockevent_init(); +} + +static void __init sirfsoc_of_timer_init(struct device_node *np) +{ + sirfsoc_timer_base = of_iomap(np, 0); + if (!sirfsoc_timer_base) + panic("unable to map timer cpu registers\n"); + + sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0); + if (!sirfsoc_timer_irq.irq) + panic("No irq passed for timer0 via DT\n"); + +#ifdef CONFIG_LOCAL_TIMERS + sirfsoc_timer1_irq.irq = irq_of_parse_and_map(np, 1); + if (!sirfsoc_timer1_irq.irq) + panic("No irq passed for timer1 via DT\n"); +#endif + + sirfsoc_marco_timer_init(); +} +CLOCKSOURCE_OF_DECLARE(sirfsoc_marco_timer, "sirf,marco-tick", sirfsoc_of_timer_init ); diff --git a/drivers/clocksource/timer-prima2.c b/drivers/clocksource/timer-prima2.c new file mode 100644 index 000000000000..760882665d7a --- /dev/null +++ b/drivers/clocksource/timer-prima2.c @@ -0,0 +1,215 @@ +/* + * System timer for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/clockchips.h> +#include <linux/clocksource.h> +#include <linux/bitops.h> +#include <linux/irq.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <asm/sched_clock.h> +#include <asm/mach/time.h> + +#define SIRFSOC_TIMER_COUNTER_LO 0x0000 +#define SIRFSOC_TIMER_COUNTER_HI 0x0004 +#define SIRFSOC_TIMER_MATCH_0 0x0008 +#define SIRFSOC_TIMER_MATCH_1 0x000C +#define SIRFSOC_TIMER_MATCH_2 0x0010 +#define SIRFSOC_TIMER_MATCH_3 0x0014 +#define SIRFSOC_TIMER_MATCH_4 0x0018 +#define SIRFSOC_TIMER_MATCH_5 0x001C +#define SIRFSOC_TIMER_STATUS 0x0020 +#define SIRFSOC_TIMER_INT_EN 0x0024 +#define SIRFSOC_TIMER_WATCHDOG_EN 0x0028 +#define SIRFSOC_TIMER_DIV 0x002C +#define SIRFSOC_TIMER_LATCH 0x0030 +#define SIRFSOC_TIMER_LATCHED_LO 0x0034 +#define SIRFSOC_TIMER_LATCHED_HI 0x0038 + +#define SIRFSOC_TIMER_WDT_INDEX 5 + +#define SIRFSOC_TIMER_LATCH_BIT BIT(0) + +#define SIRFSOC_TIMER_REG_CNT 11 + +static const u32 sirfsoc_timer_reg_list[SIRFSOC_TIMER_REG_CNT] = { + SIRFSOC_TIMER_MATCH_0, SIRFSOC_TIMER_MATCH_1, SIRFSOC_TIMER_MATCH_2, + SIRFSOC_TIMER_MATCH_3, SIRFSOC_TIMER_MATCH_4, SIRFSOC_TIMER_MATCH_5, + SIRFSOC_TIMER_INT_EN, SIRFSOC_TIMER_WATCHDOG_EN, SIRFSOC_TIMER_DIV, + SIRFSOC_TIMER_LATCHED_LO, SIRFSOC_TIMER_LATCHED_HI, +}; + +static u32 sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT]; + +static void __iomem *sirfsoc_timer_base; + +/* timer0 interrupt handler */ +static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *ce = dev_id; + + WARN_ON(!(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_STATUS) & BIT(0))); + + /* clear timer0 interrupt */ + writel_relaxed(BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_STATUS); + + ce->event_handler(ce); + + return IRQ_HANDLED; +} + +/* read 64-bit timer counter */ +static cycle_t sirfsoc_timer_read(struct clocksource *cs) +{ + u64 cycles; + + /* latch the 64-bit timer counter */ + writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); + cycles = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_HI); + cycles = (cycles << 32) | readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_LO); + + return cycles; +} + +static int sirfsoc_timer_set_next_event(unsigned long delta, + struct clock_event_device *ce) +{ + unsigned long now, next; + + writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); + now = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_LO); + next = now + delta; + writel_relaxed(next, sirfsoc_timer_base + SIRFSOC_TIMER_MATCH_0); + writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); + now = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_LO); + + return next - now > delta ? -ETIME : 0; +} + +static void sirfsoc_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *ce) +{ + u32 val = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_INT_EN); + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + WARN_ON(1); + break; + case CLOCK_EVT_MODE_ONESHOT: + writel_relaxed(val | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_INT_EN); + break; + case CLOCK_EVT_MODE_SHUTDOWN: + writel_relaxed(val & ~BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_INT_EN); + break; + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_RESUME: + break; + } +} + +static void sirfsoc_clocksource_suspend(struct clocksource *cs) +{ + int i; + + writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); + + for (i = 0; i < SIRFSOC_TIMER_REG_CNT; i++) + sirfsoc_timer_reg_val[i] = readl_relaxed(sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); +} + +static void sirfsoc_clocksource_resume(struct clocksource *cs) +{ + int i; + + for (i = 0; i < SIRFSOC_TIMER_REG_CNT - 2; i++) + writel_relaxed(sirfsoc_timer_reg_val[i], sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); + + writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 2], sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_LO); + writel_relaxed(sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT - 1], sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_HI); +} + +static struct clock_event_device sirfsoc_clockevent = { + .name = "sirfsoc_clockevent", + .rating = 200, + .features = CLOCK_EVT_FEAT_ONESHOT, + .set_mode = sirfsoc_timer_set_mode, + .set_next_event = sirfsoc_timer_set_next_event, +}; + +static struct clocksource sirfsoc_clocksource = { + .name = "sirfsoc_clocksource", + .rating = 200, + .mask = CLOCKSOURCE_MASK(64), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .read = sirfsoc_timer_read, + .suspend = sirfsoc_clocksource_suspend, + .resume = sirfsoc_clocksource_resume, +}; + +static struct irqaction sirfsoc_timer_irq = { + .name = "sirfsoc_timer0", + .flags = IRQF_TIMER, + .irq = 0, + .handler = sirfsoc_timer_interrupt, + .dev_id = &sirfsoc_clockevent, +}; + +/* Overwrite weak default sched_clock with more precise one */ +static u32 notrace sirfsoc_read_sched_clock(void) +{ + return (u32)(sirfsoc_timer_read(NULL) & 0xffffffff); +} + +static void __init sirfsoc_clockevent_init(void) +{ + sirfsoc_clockevent.cpumask = cpumask_of(0); + clockevents_config_and_register(&sirfsoc_clockevent, CLOCK_TICK_RATE, + 2, -2); +} + +/* initialize the kernel jiffy timer source */ +static void __init sirfsoc_prima2_timer_init(struct device_node *np) +{ + unsigned long rate; + struct clk *clk; + + /* timer's input clock is io clock */ + clk = clk_get_sys("io", NULL); + + BUG_ON(IS_ERR(clk)); + + rate = clk_get_rate(clk); + + BUG_ON(rate < CLOCK_TICK_RATE); + BUG_ON(rate % CLOCK_TICK_RATE); + + sirfsoc_timer_base = of_iomap(np, 0); + if (!sirfsoc_timer_base) + panic("unable to map timer cpu registers\n"); + + sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0); + + writel_relaxed(rate / CLOCK_TICK_RATE / 2 - 1, sirfsoc_timer_base + SIRFSOC_TIMER_DIV); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_LO); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_HI); + writel_relaxed(BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_STATUS); + + BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE)); + + setup_sched_clock(sirfsoc_read_sched_clock, 32, CLOCK_TICK_RATE); + + BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq)); + + sirfsoc_clockevent_init(); +} +CLOCKSOURCE_OF_DECLARE(sirfsoc_prima2_timer, "sirf,prima2-tick", sirfsoc_prima2_timer_init); |
