2017-01-22 05:17:17 -07:00
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/*
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2017-03-24 15:32:34 -06:00
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* Faraday Technology FTTMR010 timer driver
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2017-01-22 05:17:17 -07:00
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* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
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*
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* Based on a rewrite of arch/arm/mach-gemini/timer.c:
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* Copyright (C) 2001-2006 Storlink, Corp.
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* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/clockchips.h>
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#include <linux/clocksource.h>
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#include <linux/sched_clock.h>
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2017-03-24 15:32:35 -06:00
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#include <linux/clk.h>
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2017-05-18 14:17:01 -06:00
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#include <linux/slab.h>
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2017-05-18 14:17:02 -06:00
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#include <linux/bitops.h>
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2017-01-22 05:17:17 -07:00
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/*
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* Register definitions for the timers
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*/
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#define TIMER1_COUNT (0x00)
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#define TIMER1_LOAD (0x04)
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#define TIMER1_MATCH1 (0x08)
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#define TIMER1_MATCH2 (0x0c)
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#define TIMER2_COUNT (0x10)
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#define TIMER2_LOAD (0x14)
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#define TIMER2_MATCH1 (0x18)
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#define TIMER2_MATCH2 (0x1c)
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#define TIMER3_COUNT (0x20)
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#define TIMER3_LOAD (0x24)
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#define TIMER3_MATCH1 (0x28)
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#define TIMER3_MATCH2 (0x2c)
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#define TIMER_CR (0x30)
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#define TIMER_INTR_STATE (0x34)
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#define TIMER_INTR_MASK (0x38)
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2017-05-18 14:17:02 -06:00
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#define TIMER_1_CR_ENABLE BIT(0)
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#define TIMER_1_CR_CLOCK BIT(1)
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#define TIMER_1_CR_INT BIT(2)
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#define TIMER_2_CR_ENABLE BIT(3)
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#define TIMER_2_CR_CLOCK BIT(4)
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#define TIMER_2_CR_INT BIT(5)
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#define TIMER_3_CR_ENABLE BIT(6)
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#define TIMER_3_CR_CLOCK BIT(7)
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#define TIMER_3_CR_INT BIT(8)
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#define TIMER_1_CR_UPDOWN BIT(9)
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#define TIMER_2_CR_UPDOWN BIT(10)
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#define TIMER_3_CR_UPDOWN BIT(11)
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2017-01-22 05:17:17 -07:00
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2017-05-18 14:17:04 -06:00
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/*
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* The Aspeed AST2400 moves bits around in the control register
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* and lacks bits for setting the timer to count upwards.
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*/
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#define TIMER_1_CR_ASPEED_ENABLE BIT(0)
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#define TIMER_1_CR_ASPEED_CLOCK BIT(1)
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#define TIMER_1_CR_ASPEED_INT BIT(2)
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#define TIMER_2_CR_ASPEED_ENABLE BIT(4)
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#define TIMER_2_CR_ASPEED_CLOCK BIT(5)
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#define TIMER_2_CR_ASPEED_INT BIT(6)
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#define TIMER_3_CR_ASPEED_ENABLE BIT(8)
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#define TIMER_3_CR_ASPEED_CLOCK BIT(9)
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#define TIMER_3_CR_ASPEED_INT BIT(10)
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2017-05-18 14:17:02 -06:00
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#define TIMER_1_INT_MATCH1 BIT(0)
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#define TIMER_1_INT_MATCH2 BIT(1)
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#define TIMER_1_INT_OVERFLOW BIT(2)
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#define TIMER_2_INT_MATCH1 BIT(3)
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#define TIMER_2_INT_MATCH2 BIT(4)
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#define TIMER_2_INT_OVERFLOW BIT(5)
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#define TIMER_3_INT_MATCH1 BIT(6)
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#define TIMER_3_INT_MATCH2 BIT(7)
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#define TIMER_3_INT_OVERFLOW BIT(8)
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2017-01-22 05:17:17 -07:00
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#define TIMER_INT_ALL_MASK 0x1ff
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2017-05-18 14:17:01 -06:00
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struct fttmr010 {
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void __iomem *base;
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unsigned int tick_rate;
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2017-05-18 14:17:04 -06:00
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bool count_down;
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u32 t1_enable_val;
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2017-05-18 14:17:01 -06:00
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struct clock_event_device clkevt;
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};
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/* A local singleton used by sched_clock, which is stateless */
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static struct fttmr010 *local_fttmr;
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static inline struct fttmr010 *to_fttmr010(struct clock_event_device *evt)
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{
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return container_of(evt, struct fttmr010, clkevt);
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}
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2017-01-22 05:17:17 -07:00
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2017-03-24 15:32:34 -06:00
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static u64 notrace fttmr010_read_sched_clock(void)
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2017-01-22 05:17:17 -07:00
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{
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2017-05-18 14:17:04 -06:00
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if (local_fttmr->count_down)
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return ~readl(local_fttmr->base + TIMER2_COUNT);
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2017-05-18 14:17:03 -06:00
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return readl(local_fttmr->base + TIMER2_COUNT);
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2017-01-22 05:17:17 -07:00
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}
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2017-03-24 15:32:34 -06:00
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static int fttmr010_timer_set_next_event(unsigned long cycles,
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2017-01-22 05:17:17 -07:00
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struct clock_event_device *evt)
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{
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2017-05-18 14:17:01 -06:00
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struct fttmr010 *fttmr010 = to_fttmr010(evt);
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2017-01-22 05:17:17 -07:00
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u32 cr;
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2017-05-18 14:17:04 -06:00
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/* Stop */
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cr = readl(fttmr010->base + TIMER_CR);
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cr &= ~fttmr010->t1_enable_val;
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writel(cr, fttmr010->base + TIMER_CR);
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/* Setup the match register forward/backward in time */
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2017-05-18 14:17:01 -06:00
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cr = readl(fttmr010->base + TIMER1_COUNT);
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2017-05-18 14:17:04 -06:00
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if (fttmr010->count_down)
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cr -= cycles;
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else
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cr += cycles;
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writel(cr, fttmr010->base + TIMER1_MATCH1);
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/* Start */
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cr = readl(fttmr010->base + TIMER_CR);
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cr |= fttmr010->t1_enable_val;
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writel(cr, fttmr010->base + TIMER_CR);
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2017-01-22 05:17:17 -07:00
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return 0;
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}
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2017-03-24 15:32:34 -06:00
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static int fttmr010_timer_shutdown(struct clock_event_device *evt)
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2017-01-22 05:17:17 -07:00
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{
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2017-05-18 14:17:01 -06:00
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struct fttmr010 *fttmr010 = to_fttmr010(evt);
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u32 cr;
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2017-05-18 14:17:04 -06:00
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/* Stop */
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2017-05-18 14:17:01 -06:00
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cr = readl(fttmr010->base + TIMER_CR);
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2017-05-18 14:17:04 -06:00
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cr &= ~fttmr010->t1_enable_val;
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2017-05-18 14:17:01 -06:00
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writel(cr, fttmr010->base + TIMER_CR);
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return 0;
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}
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static int fttmr010_timer_set_oneshot(struct clock_event_device *evt)
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{
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struct fttmr010 *fttmr010 = to_fttmr010(evt);
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2017-01-22 05:17:17 -07:00
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u32 cr;
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2017-05-18 14:17:04 -06:00
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/* Stop */
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2017-05-18 14:17:01 -06:00
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cr = readl(fttmr010->base + TIMER_CR);
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2017-05-18 14:17:04 -06:00
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cr &= ~fttmr010->t1_enable_val;
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2017-05-18 14:17:01 -06:00
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writel(cr, fttmr010->base + TIMER_CR);
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2017-01-22 05:17:17 -07:00
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2017-05-18 14:17:04 -06:00
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/* Setup counter start from 0 or ~0 */
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2017-05-18 14:17:01 -06:00
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writel(0, fttmr010->base + TIMER1_COUNT);
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2017-05-18 14:17:04 -06:00
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if (fttmr010->count_down)
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writel(~0, fttmr010->base + TIMER1_LOAD);
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else
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writel(0, fttmr010->base + TIMER1_LOAD);
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2017-01-22 05:17:17 -07:00
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2017-05-18 14:17:01 -06:00
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/* Enable interrupt */
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cr = readl(fttmr010->base + TIMER_INTR_MASK);
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2017-01-22 05:17:17 -07:00
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cr &= ~(TIMER_1_INT_OVERFLOW | TIMER_1_INT_MATCH2);
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cr |= TIMER_1_INT_MATCH1;
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2017-05-18 14:17:01 -06:00
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writel(cr, fttmr010->base + TIMER_INTR_MASK);
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2017-01-22 05:17:17 -07:00
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return 0;
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}
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2017-03-24 15:32:34 -06:00
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static int fttmr010_timer_set_periodic(struct clock_event_device *evt)
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2017-01-22 05:17:17 -07:00
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{
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2017-05-18 14:17:01 -06:00
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struct fttmr010 *fttmr010 = to_fttmr010(evt);
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u32 period = DIV_ROUND_CLOSEST(fttmr010->tick_rate, HZ);
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2017-01-22 05:17:17 -07:00
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u32 cr;
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2017-05-18 14:17:04 -06:00
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/* Stop */
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2017-05-18 14:17:01 -06:00
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cr = readl(fttmr010->base + TIMER_CR);
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2017-05-18 14:17:04 -06:00
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cr &= ~fttmr010->t1_enable_val;
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2017-05-18 14:17:01 -06:00
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writel(cr, fttmr010->base + TIMER_CR);
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2017-01-22 05:17:17 -07:00
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2017-05-18 14:17:04 -06:00
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/* Setup timer to fire at 1/HZ intervals. */
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if (fttmr010->count_down) {
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writel(period, fttmr010->base + TIMER1_LOAD);
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writel(0, fttmr010->base + TIMER1_MATCH1);
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} else {
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cr = 0xffffffff - (period - 1);
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writel(cr, fttmr010->base + TIMER1_COUNT);
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writel(cr, fttmr010->base + TIMER1_LOAD);
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/* Enable interrupt on overflow */
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cr = readl(fttmr010->base + TIMER_INTR_MASK);
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cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2);
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cr |= TIMER_1_INT_OVERFLOW;
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writel(cr, fttmr010->base + TIMER_INTR_MASK);
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}
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2017-01-22 05:17:17 -07:00
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/* Start the timer */
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2017-05-18 14:17:01 -06:00
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cr = readl(fttmr010->base + TIMER_CR);
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2017-05-18 14:17:04 -06:00
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cr |= fttmr010->t1_enable_val;
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2017-05-18 14:17:01 -06:00
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writel(cr, fttmr010->base + TIMER_CR);
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2017-01-22 05:17:17 -07:00
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return 0;
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}
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/*
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* IRQ handler for the timer
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*/
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2017-03-24 15:32:34 -06:00
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static irqreturn_t fttmr010_timer_interrupt(int irq, void *dev_id)
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2017-01-22 05:17:17 -07:00
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{
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2017-05-18 14:17:01 -06:00
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struct clock_event_device *evt = dev_id;
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2017-01-22 05:17:17 -07:00
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evt->event_handler(evt);
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return IRQ_HANDLED;
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}
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2017-05-26 02:38:07 -06:00
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static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
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2017-01-22 05:17:17 -07:00
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{
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2017-05-18 14:17:01 -06:00
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struct fttmr010 *fttmr010;
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2017-01-22 05:17:17 -07:00
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int irq;
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2017-05-18 14:17:00 -06:00
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struct clk *clk;
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int ret;
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2017-05-18 14:17:04 -06:00
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u32 val;
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2017-05-18 14:17:00 -06:00
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/*
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* These implementations require a clock reference.
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* FIXME: we currently only support clocking using PCLK
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* and using EXTCLK is not supported in the driver.
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*/
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clk = of_clk_get_by_name(np, "PCLK");
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if (IS_ERR(clk)) {
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pr_err("could not get PCLK\n");
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return PTR_ERR(clk);
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}
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ret = clk_prepare_enable(clk);
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if (ret) {
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pr_err("failed to enable PCLK\n");
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return ret;
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}
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2017-01-22 05:17:17 -07:00
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2017-05-18 14:17:01 -06:00
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fttmr010 = kzalloc(sizeof(*fttmr010), GFP_KERNEL);
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if (!fttmr010) {
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ret = -ENOMEM;
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goto out_disable_clock;
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}
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fttmr010->tick_rate = clk_get_rate(clk);
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fttmr010->base = of_iomap(np, 0);
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if (!fttmr010->base) {
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2017-01-22 05:17:17 -07:00
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pr_err("Can't remap registers");
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2017-05-18 14:17:01 -06:00
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ret = -ENXIO;
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goto out_free;
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2017-01-22 05:17:17 -07:00
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}
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/* IRQ for timer 1 */
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irq = irq_of_parse_and_map(np, 0);
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if (irq <= 0) {
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pr_err("Can't parse IRQ");
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2017-05-18 14:17:01 -06:00
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ret = -EINVAL;
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goto out_unmap;
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2017-01-22 05:17:17 -07:00
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}
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2017-05-18 14:17:04 -06:00
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/*
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* The Aspeed AST2400 moves bits around in the control register,
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* otherwise it works the same.
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*/
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2017-05-26 02:38:07 -06:00
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if (is_aspeed) {
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2017-05-18 14:17:04 -06:00
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fttmr010->t1_enable_val = TIMER_1_CR_ASPEED_ENABLE |
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TIMER_1_CR_ASPEED_INT;
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/* Downward not available */
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fttmr010->count_down = true;
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} else {
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fttmr010->t1_enable_val = TIMER_1_CR_ENABLE | TIMER_1_CR_INT;
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}
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2017-01-22 05:17:17 -07:00
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/*
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* Reset the interrupt mask and status
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*/
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2017-05-18 14:17:01 -06:00
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writel(TIMER_INT_ALL_MASK, fttmr010->base + TIMER_INTR_MASK);
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writel(0, fttmr010->base + TIMER_INTR_STATE);
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2017-05-18 14:17:04 -06:00
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/*
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* Enable timer 1 count up, timer 2 count up, except on Aspeed,
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* where everything just counts down.
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*/
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2017-05-26 02:38:07 -06:00
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if (is_aspeed)
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2017-05-18 14:17:04 -06:00
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val = TIMER_2_CR_ASPEED_ENABLE;
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else {
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val = TIMER_2_CR_ENABLE;
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if (!fttmr010->count_down)
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val |= TIMER_1_CR_UPDOWN | TIMER_2_CR_UPDOWN;
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}
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writel(val, fttmr010->base + TIMER_CR);
|
2017-01-22 05:17:17 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Setup free-running clocksource timer (interrupts
|
|
|
|
* disabled.)
|
|
|
|
*/
|
2017-05-18 14:17:01 -06:00
|
|
|
local_fttmr = fttmr010;
|
2017-05-18 14:17:03 -06:00
|
|
|
writel(0, fttmr010->base + TIMER2_COUNT);
|
|
|
|
writel(0, fttmr010->base + TIMER2_MATCH1);
|
|
|
|
writel(0, fttmr010->base + TIMER2_MATCH2);
|
2017-05-18 14:17:04 -06:00
|
|
|
|
|
|
|
if (fttmr010->count_down) {
|
|
|
|
writel(~0, fttmr010->base + TIMER2_LOAD);
|
|
|
|
clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
|
|
|
|
"FTTMR010-TIMER2",
|
|
|
|
fttmr010->tick_rate,
|
|
|
|
300, 32, clocksource_mmio_readl_down);
|
|
|
|
} else {
|
|
|
|
writel(0, fttmr010->base + TIMER2_LOAD);
|
|
|
|
clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
|
|
|
|
"FTTMR010-TIMER2",
|
|
|
|
fttmr010->tick_rate,
|
|
|
|
300, 32, clocksource_mmio_readl_up);
|
|
|
|
}
|
2017-05-18 14:17:01 -06:00
|
|
|
sched_clock_register(fttmr010_read_sched_clock, 32,
|
|
|
|
fttmr010->tick_rate);
|
2017-01-22 05:17:17 -07:00
|
|
|
|
|
|
|
/*
|
2017-05-18 14:17:01 -06:00
|
|
|
* Setup clockevent timer (interrupt-driven) on timer 1.
|
2017-01-22 05:17:17 -07:00
|
|
|
*/
|
2017-05-18 14:17:01 -06:00
|
|
|
writel(0, fttmr010->base + TIMER1_COUNT);
|
|
|
|
writel(0, fttmr010->base + TIMER1_LOAD);
|
|
|
|
writel(0, fttmr010->base + TIMER1_MATCH1);
|
|
|
|
writel(0, fttmr010->base + TIMER1_MATCH2);
|
|
|
|
ret = request_irq(irq, fttmr010_timer_interrupt, IRQF_TIMER,
|
|
|
|
"FTTMR010-TIMER1", &fttmr010->clkevt);
|
|
|
|
if (ret) {
|
|
|
|
pr_err("FTTMR010-TIMER1 no IRQ\n");
|
|
|
|
goto out_unmap;
|
|
|
|
}
|
|
|
|
|
|
|
|
fttmr010->clkevt.name = "FTTMR010-TIMER1";
|
|
|
|
/* Reasonably fast and accurate clock event */
|
|
|
|
fttmr010->clkevt.rating = 300;
|
|
|
|
fttmr010->clkevt.features = CLOCK_EVT_FEAT_PERIODIC |
|
|
|
|
CLOCK_EVT_FEAT_ONESHOT;
|
|
|
|
fttmr010->clkevt.set_next_event = fttmr010_timer_set_next_event;
|
|
|
|
fttmr010->clkevt.set_state_shutdown = fttmr010_timer_shutdown;
|
|
|
|
fttmr010->clkevt.set_state_periodic = fttmr010_timer_set_periodic;
|
|
|
|
fttmr010->clkevt.set_state_oneshot = fttmr010_timer_set_oneshot;
|
|
|
|
fttmr010->clkevt.tick_resume = fttmr010_timer_shutdown;
|
|
|
|
fttmr010->clkevt.cpumask = cpumask_of(0);
|
|
|
|
fttmr010->clkevt.irq = irq;
|
|
|
|
clockevents_config_and_register(&fttmr010->clkevt,
|
|
|
|
fttmr010->tick_rate,
|
2017-01-22 05:17:17 -07:00
|
|
|
1, 0xffffffff);
|
|
|
|
|
|
|
|
return 0;
|
2017-05-18 14:17:01 -06:00
|
|
|
|
|
|
|
out_unmap:
|
|
|
|
iounmap(fttmr010->base);
|
|
|
|
out_free:
|
|
|
|
kfree(fttmr010);
|
|
|
|
out_disable_clock:
|
|
|
|
clk_disable_unprepare(clk);
|
|
|
|
|
|
|
|
return ret;
|
2017-01-22 05:17:17 -07:00
|
|
|
}
|
2017-05-26 02:38:07 -06:00
|
|
|
|
|
|
|
static __init int aspeed_timer_init(struct device_node *np)
|
|
|
|
{
|
|
|
|
return fttmr010_common_init(np, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
static __init int fttmr010_timer_init(struct device_node *np)
|
|
|
|
{
|
|
|
|
return fttmr010_common_init(np, false);
|
|
|
|
}
|
|
|
|
|
2017-05-18 14:17:00 -06:00
|
|
|
CLOCKSOURCE_OF_DECLARE(fttmr010, "faraday,fttmr010", fttmr010_timer_init);
|
|
|
|
CLOCKSOURCE_OF_DECLARE(gemini, "cortina,gemini-timer", fttmr010_timer_init);
|
2017-05-18 14:17:04 -06:00
|
|
|
CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", fttmr010_timer_init);
|
2017-05-26 02:38:07 -06:00
|
|
|
CLOCKSOURCE_OF_DECLARE(ast2400, "aspeed,ast2400-timer", aspeed_timer_init);
|
|
|
|
CLOCKSOURCE_OF_DECLARE(ast2500, "aspeed,ast2500-timer", aspeed_timer_init);
|