190 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018 Socionext Inc.4 */5 6#include <linux/clk.h>7#include <linux/interrupt.h>8#include <linux/irq.h>9#include <linux/irqreturn.h>10#include <linux/sched_clock.h>11#include "timer-of.h"12 13#define MLB_TMR_TMCSR_OFS 0x014#define MLB_TMR_TMR_OFS 0x415#define MLB_TMR_TMRLR1_OFS 0x816#define MLB_TMR_TMRLR2_OFS 0xc17#define MLB_TMR_REGSZPCH 0x1018 19#define MLB_TMR_TMCSR_OUTL BIT(5)20#define MLB_TMR_TMCSR_RELD BIT(4)21#define MLB_TMR_TMCSR_INTE BIT(3)22#define MLB_TMR_TMCSR_UF BIT(2)23#define MLB_TMR_TMCSR_CNTE BIT(1)24#define MLB_TMR_TMCSR_TRG BIT(0)25 26#define MLB_TMR_TMCSR_CSL_DIV2 027#define MLB_TMR_DIV_CNT 228 29#define MLB_TMR_SRC_CH 130#define MLB_TMR_EVT_CH 031 32#define MLB_TMR_SRC_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_SRC_CH)33#define MLB_TMR_EVT_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_EVT_CH)34 35#define MLB_TMR_SRC_TMCSR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMCSR_OFS)36#define MLB_TMR_SRC_TMR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMR_OFS)37#define MLB_TMR_SRC_TMRLR1_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR1_OFS)38#define MLB_TMR_SRC_TMRLR2_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR2_OFS)39 40#define MLB_TMR_EVT_TMCSR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMCSR_OFS)41#define MLB_TMR_EVT_TMR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMR_OFS)42#define MLB_TMR_EVT_TMRLR1_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR1_OFS)43#define MLB_TMR_EVT_TMRLR2_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR2_OFS)44 45#define MLB_TIMER_RATING 50046#define MLB_TIMER_ONESHOT 047#define MLB_TIMER_PERIODIC 148 49static irqreturn_t mlb_timer_interrupt(int irq, void *dev_id)50{51 struct clock_event_device *clk = dev_id;52 struct timer_of *to = to_timer_of(clk);53 u32 val;54 55 val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);56 val &= ~MLB_TMR_TMCSR_UF;57 writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);58 59 clk->event_handler(clk);60 61 return IRQ_HANDLED;62}63 64static void mlb_evt_timer_start(struct timer_of *to, bool periodic)65{66 u32 val = MLB_TMR_TMCSR_CSL_DIV2;67 68 val |= MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_TRG | MLB_TMR_TMCSR_INTE;69 if (periodic)70 val |= MLB_TMR_TMCSR_RELD;71 writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);72}73 74static void mlb_evt_timer_stop(struct timer_of *to)75{76 u32 val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);77 78 val &= ~MLB_TMR_TMCSR_CNTE;79 writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);80}81 82static void mlb_evt_timer_register_count(struct timer_of *to, unsigned long cnt)83{84 writel_relaxed(cnt, timer_of_base(to) + MLB_TMR_EVT_TMRLR1_OFS);85}86 87static int mlb_set_state_periodic(struct clock_event_device *clk)88{89 struct timer_of *to = to_timer_of(clk);90 91 mlb_evt_timer_stop(to);92 mlb_evt_timer_register_count(to, to->of_clk.period);93 mlb_evt_timer_start(to, MLB_TIMER_PERIODIC);94 return 0;95}96 97static int mlb_set_state_oneshot(struct clock_event_device *clk)98{99 struct timer_of *to = to_timer_of(clk);100 101 mlb_evt_timer_stop(to);102 mlb_evt_timer_start(to, MLB_TIMER_ONESHOT);103 return 0;104}105 106static int mlb_set_state_shutdown(struct clock_event_device *clk)107{108 struct timer_of *to = to_timer_of(clk);109 110 mlb_evt_timer_stop(to);111 return 0;112}113 114static int mlb_clkevt_next_event(unsigned long event,115 struct clock_event_device *clk)116{117 struct timer_of *to = to_timer_of(clk);118 119 mlb_evt_timer_stop(to);120 mlb_evt_timer_register_count(to, event);121 mlb_evt_timer_start(to, MLB_TIMER_ONESHOT);122 return 0;123}124 125static int mlb_config_clock_source(struct timer_of *to)126{127 u32 val = MLB_TMR_TMCSR_CSL_DIV2;128 129 writel_relaxed(val, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS);130 writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR1_OFS);131 writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR2_OFS);132 val |= MLB_TMR_TMCSR_RELD | MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_TRG;133 writel_relaxed(val, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS);134 return 0;135}136 137static int mlb_config_clock_event(struct timer_of *to)138{139 writel_relaxed(0, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);140 return 0;141}142 143static struct timer_of to = {144 .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,145 146 .clkevt = {147 .name = "mlb-clkevt",148 .rating = MLB_TIMER_RATING,149 .cpumask = cpu_possible_mask,150 .features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT,151 .set_state_oneshot = mlb_set_state_oneshot,152 .set_state_periodic = mlb_set_state_periodic,153 .set_state_shutdown = mlb_set_state_shutdown,154 .set_next_event = mlb_clkevt_next_event,155 },156 157 .of_irq = {158 .flags = IRQF_TIMER | IRQF_IRQPOLL,159 .handler = mlb_timer_interrupt,160 },161};162 163static u64 notrace mlb_timer_sched_read(void)164{165 return ~readl_relaxed(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS);166}167 168static int __init mlb_timer_init(struct device_node *node)169{170 int ret;171 unsigned long rate;172 173 ret = timer_of_init(node, &to);174 if (ret)175 return ret;176 177 rate = timer_of_rate(&to) / MLB_TMR_DIV_CNT;178 mlb_config_clock_source(&to);179 clocksource_mmio_init(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS,180 node->name, rate, MLB_TIMER_RATING, 32,181 clocksource_mmio_readl_down);182 sched_clock_register(mlb_timer_sched_read, 32, rate);183 mlb_config_clock_event(&to);184 clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 15,185 0xffffffff);186 return 0;187}188TIMER_OF_DECLARE(mlb_peritimer, "socionext,milbeaut-timer",189 mlb_timer_init);190