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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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5.2 kB · 189 lines
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2018 Socionext Inc. */
#include <linux/clk.h>#include <linux/interrupt.h>#include <linux/irq.h>#include <linux/irqreturn.h>#include <linux/sched_clock.h>#include "timer-of.h"
#define MLB_TMR_TMCSR_OFS 0x0#define MLB_TMR_TMR_OFS 0x4#define MLB_TMR_TMRLR1_OFS 0x8#define MLB_TMR_TMRLR2_OFS 0xc#define MLB_TMR_REGSZPCH 0x10
#define MLB_TMR_TMCSR_OUTL BIT(5)#define MLB_TMR_TMCSR_RELD BIT(4)#define MLB_TMR_TMCSR_INTE BIT(3)#define MLB_TMR_TMCSR_UF BIT(2)#define MLB_TMR_TMCSR_CNTE BIT(1)#define MLB_TMR_TMCSR_TRG BIT(0)
#define MLB_TMR_TMCSR_CSL_DIV2 0#define MLB_TMR_DIV_CNT 2
#define MLB_TMR_SRC_CH 1#define MLB_TMR_EVT_CH 0
#define MLB_TMR_SRC_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_SRC_CH)#define MLB_TMR_EVT_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_EVT_CH)
#define MLB_TMR_SRC_TMCSR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMCSR_OFS)#define MLB_TMR_SRC_TMR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMR_OFS)#define MLB_TMR_SRC_TMRLR1_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR1_OFS)#define MLB_TMR_SRC_TMRLR2_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR2_OFS)
#define MLB_TMR_EVT_TMCSR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMCSR_OFS)#define MLB_TMR_EVT_TMR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMR_OFS)#define MLB_TMR_EVT_TMRLR1_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR1_OFS)#define MLB_TMR_EVT_TMRLR2_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR2_OFS)
#define MLB_TIMER_RATING 500#define MLB_TIMER_ONESHOT 0#define MLB_TIMER_PERIODIC 1
static irqreturn_t mlb_timer_interrupt(int irq, void *dev_id){ struct clock_event_device *clk = dev_id; struct timer_of *to = to_timer_of(clk); u32 val;
val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS); val &= ~MLB_TMR_TMCSR_UF; writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
clk->event_handler(clk);
return IRQ_HANDLED;}
static void mlb_evt_timer_start(struct timer_of *to, bool periodic){ u32 val = MLB_TMR_TMCSR_CSL_DIV2;
val |= MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_TRG | MLB_TMR_TMCSR_INTE; if (periodic) val |= MLB_TMR_TMCSR_RELD; writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);}
static void mlb_evt_timer_stop(struct timer_of *to){ u32 val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
val &= ~MLB_TMR_TMCSR_CNTE; writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);}
static void mlb_evt_timer_register_count(struct timer_of *to, unsigned long cnt){ writel_relaxed(cnt, timer_of_base(to) + MLB_TMR_EVT_TMRLR1_OFS);}
static int mlb_set_state_periodic(struct clock_event_device *clk){ struct timer_of *to = to_timer_of(clk);
mlb_evt_timer_stop(to); mlb_evt_timer_register_count(to, to->of_clk.period); mlb_evt_timer_start(to, MLB_TIMER_PERIODIC); return 0;}
static int mlb_set_state_oneshot(struct clock_event_device *clk){ struct timer_of *to = to_timer_of(clk);
mlb_evt_timer_stop(to); mlb_evt_timer_start(to, MLB_TIMER_ONESHOT); return 0;}
static int mlb_set_state_shutdown(struct clock_event_device *clk){ struct timer_of *to = to_timer_of(clk);
mlb_evt_timer_stop(to); return 0;}
static int mlb_clkevt_next_event(unsigned long event, struct clock_event_device *clk){ struct timer_of *to = to_timer_of(clk);
mlb_evt_timer_stop(to); mlb_evt_timer_register_count(to, event); mlb_evt_timer_start(to, MLB_TIMER_ONESHOT); return 0;}
static int mlb_config_clock_source(struct timer_of *to){ u32 val = MLB_TMR_TMCSR_CSL_DIV2;
writel_relaxed(val, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS); writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR1_OFS); writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR2_OFS); val |= MLB_TMR_TMCSR_RELD | MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_TRG; writel_relaxed(val, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS); return 0;}
static int mlb_config_clock_event(struct timer_of *to){ writel_relaxed(0, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS); return 0;}
static struct timer_of to = { .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
.clkevt = { .name = "mlb-clkevt", .rating = MLB_TIMER_RATING, .cpumask = cpu_possible_mask, .features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT, .set_state_oneshot = mlb_set_state_oneshot, .set_state_periodic = mlb_set_state_periodic, .set_state_shutdown = mlb_set_state_shutdown, .set_next_event = mlb_clkevt_next_event, },
.of_irq = { .flags = IRQF_TIMER | IRQF_IRQPOLL, .handler = mlb_timer_interrupt, },};
static u64 notrace mlb_timer_sched_read(void){ return ~readl_relaxed(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS);}
static int __init mlb_timer_init(struct device_node *node){ int ret; unsigned long rate;
ret = timer_of_init(node, &to); if (ret) return ret;
rate = timer_of_rate(&to) / MLB_TMR_DIV_CNT; mlb_config_clock_source(&to); clocksource_mmio_init(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS, node->name, rate, MLB_TIMER_RATING, 32, clocksource_mmio_readl_down); sched_clock_register(mlb_timer_sched_read, 32, rate); mlb_config_clock_event(&to); clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 15, 0xffffffff); return 0;}TIMER_OF_DECLARE(mlb_peritimer, "socionext,milbeaut-timer", mlb_timer_init);