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