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drivers/clocksource/timer-prima2.c
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/* * 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> |
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#include <linux/of_irq.h> |
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#include <linux/of_address.h> |
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#include <linux/sched_clock.h> |
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#include <asm/mach/time.h> |
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#define PRIMA2_CLOCK_FREQ 1000000 |
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#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) |
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#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]; |
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static void __iomem *sirfsoc_timer_base; |
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/* timer0 interrupt handler */ static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id) { struct clock_event_device *ce = dev_id; |
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WARN_ON(!(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_STATUS) & BIT(0))); |
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/* 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 */ |
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writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); |
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cycles = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_HI); |
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cycles = (cycles << 32) | readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_LO); |
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return cycles; } static int sirfsoc_timer_set_next_event(unsigned long delta, struct clock_event_device *ce) { unsigned long now, next; |
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writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); |
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now = readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_LATCHED_LO); next = now + delta; writel_relaxed(next, sirfsoc_timer_base + SIRFSOC_TIMER_MATCH_0); |
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writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); |
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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: |
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writel_relaxed(val | BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_INT_EN); |
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break; case CLOCK_EVT_MODE_SHUTDOWN: |
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writel_relaxed(val & ~BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_INT_EN); |
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break; case CLOCK_EVT_MODE_UNUSED: case CLOCK_EVT_MODE_RESUME: break; } } |
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static void sirfsoc_clocksource_suspend(struct clocksource *cs) { int i; |
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writel_relaxed(SIRFSOC_TIMER_LATCH_BIT, sirfsoc_timer_base + SIRFSOC_TIMER_LATCH); |
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for (i = 0; i < SIRFSOC_TIMER_REG_CNT; i++) |
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sirfsoc_timer_reg_val[i] = readl_relaxed(sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); |
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} static void sirfsoc_clocksource_resume(struct clocksource *cs) { int i; |
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for (i = 0; i < SIRFSOC_TIMER_REG_CNT - 2; i++) |
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writel_relaxed(sirfsoc_timer_reg_val[i], sirfsoc_timer_base + sirfsoc_timer_reg_list[i]); |
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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); |
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} |
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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, |
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.suspend = sirfsoc_clocksource_suspend, .resume = sirfsoc_clocksource_resume, |
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}; 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 */ |
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static u64 notrace sirfsoc_read_sched_clock(void) |
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{ |
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return sirfsoc_timer_read(NULL); |
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} static void __init sirfsoc_clockevent_init(void) { |
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sirfsoc_clockevent.cpumask = cpumask_of(0); |
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clockevents_config_and_register(&sirfsoc_clockevent, PRIMA2_CLOCK_FREQ, |
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2, -2); |
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} /* initialize the kernel jiffy timer source */ |
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static void __init sirfsoc_prima2_timer_init(struct device_node *np) |
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{ unsigned long rate; |
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struct clk *clk; |
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clk = of_clk_get(np, 0); |
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BUG_ON(IS_ERR(clk)); |
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BUG_ON(clk_prepare_enable(clk)); |
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rate = clk_get_rate(clk); |
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BUG_ON(rate < PRIMA2_CLOCK_FREQ); BUG_ON(rate % PRIMA2_CLOCK_FREQ); |
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sirfsoc_timer_base = of_iomap(np, 0); if (!sirfsoc_timer_base) panic("unable to map timer cpu registers "); sirfsoc_timer_irq.irq = irq_of_parse_and_map(np, 0); |
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writel_relaxed(rate / PRIMA2_CLOCK_FREQ / 2 - 1, |
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sirfsoc_timer_base + SIRFSOC_TIMER_DIV); |
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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); |
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BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, PRIMA2_CLOCK_FREQ)); |
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sched_clock_register(sirfsoc_read_sched_clock, 64, PRIMA2_CLOCK_FREQ); |
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BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq)); sirfsoc_clockevent_init(); } |
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CLOCKSOURCE_OF_DECLARE(sirfsoc_prima2_timer, "sirf,prima2-tick", sirfsoc_prima2_timer_init); |