Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * vineetg: Jan 1011 |
| 9 | * -sched_clock( ) no longer jiffies based. Uses the same clocksource |
| 10 | * as gtod |
| 11 | * |
| 12 | * Rajeshwarr/Vineetg: Mar 2008 |
| 13 | * -Implemented CONFIG_GENERIC_TIME (rather deleted arch specific code) |
| 14 | * for arch independent gettimeofday() |
| 15 | * -Implemented CONFIG_GENERIC_CLOCKEVENTS as base for hrtimers |
| 16 | * |
| 17 | * Vineetg: Mar 2008: Forked off from time.c which now is time-jiff.c |
| 18 | */ |
| 19 | |
| 20 | /* ARC700 has two 32bit independent prog Timers: TIMER0 and TIMER1 |
| 21 | * Each can programmed to go from @count to @limit and optionally |
| 22 | * interrupt when that happens. |
| 23 | * A write to Control Register clears the Interrupt |
| 24 | * |
| 25 | * We've designated TIMER0 for events (clockevents) |
| 26 | * while TIMER1 for free running (clocksource) |
| 27 | * |
| 28 | * Newer ARC700 cores have 64bit clk fetching RTSC insn, preferred over TIMER1 |
Vineet Gupta | 565a9b4 | 2015-03-07 17:06:09 +0530 | [diff] [blame] | 29 | * which however is currently broken |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 30 | */ |
| 31 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 32 | #include <linux/interrupt.h> |
Noam Camus | 69fbd09 | 2016-01-14 12:20:08 +0530 | [diff] [blame] | 33 | #include <linux/clk.h> |
| 34 | #include <linux/clk-provider.h> |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 35 | #include <linux/clocksource.h> |
| 36 | #include <linux/clockchips.h> |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 37 | #include <linux/cpu.h> |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 38 | #include <linux/of.h> |
| 39 | #include <linux/of_irq.h> |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 40 | #include <asm/irq.h> |
| 41 | #include <asm/arcregs.h> |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 42 | |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 43 | #include <asm/mcip.h> |
| 44 | |
Vineet Gupta | da1677b | 2013-05-14 13:28:17 +0530 | [diff] [blame] | 45 | /* Timer related Aux registers */ |
| 46 | #define ARC_REG_TIMER0_LIMIT 0x23 /* timer 0 limit */ |
| 47 | #define ARC_REG_TIMER0_CTRL 0x22 /* timer 0 control */ |
| 48 | #define ARC_REG_TIMER0_CNT 0x21 /* timer 0 count */ |
| 49 | #define ARC_REG_TIMER1_LIMIT 0x102 /* timer 1 limit */ |
| 50 | #define ARC_REG_TIMER1_CTRL 0x101 /* timer 1 control */ |
| 51 | #define ARC_REG_TIMER1_CNT 0x100 /* timer 1 count */ |
| 52 | |
Adam Buchbinder | 7423cc0 | 2016-02-23 15:24:55 -0800 | [diff] [blame] | 53 | #define TIMER_CTRL_IE (1 << 0) /* Interrupt when Count reaches limit */ |
| 54 | #define TIMER_CTRL_NH (1 << 1) /* Count only when CPU NOT halted */ |
Vineet Gupta | da1677b | 2013-05-14 13:28:17 +0530 | [diff] [blame] | 55 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 56 | #define ARC_TIMER_MAX 0xFFFFFFFF |
| 57 | |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 58 | static unsigned long arc_timer_freq; |
| 59 | |
| 60 | static int noinline arc_get_timer_clk(struct device_node *node) |
| 61 | { |
| 62 | struct clk *clk; |
| 63 | int ret; |
| 64 | |
| 65 | clk = of_clk_get(node, 0); |
| 66 | if (IS_ERR(clk)) { |
| 67 | pr_err("timer missing clk"); |
| 68 | return PTR_ERR(clk); |
| 69 | } |
| 70 | |
| 71 | ret = clk_prepare_enable(clk); |
| 72 | if (ret) { |
| 73 | pr_err("Couldn't enable parent clk\n"); |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | arc_timer_freq = clk_get_rate(clk); |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 82 | /********** Clock Source Device *********/ |
| 83 | |
Vineet Gupta | d584f0f | 2016-01-22 14:27:50 +0530 | [diff] [blame] | 84 | #ifdef CONFIG_ARC_HAS_GFRC |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 85 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 86 | static cycle_t arc_read_gfrc(struct clocksource *cs) |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 87 | { |
| 88 | unsigned long flags; |
| 89 | union { |
| 90 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 91 | struct { u32 h, l; }; |
| 92 | #else |
| 93 | struct { u32 l, h; }; |
| 94 | #endif |
| 95 | cycle_t full; |
| 96 | } stamp; |
| 97 | |
| 98 | local_irq_save(flags); |
| 99 | |
Vineet Gupta | d584f0f | 2016-01-22 14:27:50 +0530 | [diff] [blame] | 100 | __mcip_cmd(CMD_GFRC_READ_LO, 0); |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 101 | stamp.l = read_aux_reg(ARC_REG_MCIP_READBACK); |
| 102 | |
Vineet Gupta | d584f0f | 2016-01-22 14:27:50 +0530 | [diff] [blame] | 103 | __mcip_cmd(CMD_GFRC_READ_HI, 0); |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 104 | stamp.h = read_aux_reg(ARC_REG_MCIP_READBACK); |
| 105 | |
| 106 | local_irq_restore(flags); |
| 107 | |
| 108 | return stamp.full; |
| 109 | } |
| 110 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 111 | static struct clocksource arc_counter_gfrc = { |
Vineet Gupta | d584f0f | 2016-01-22 14:27:50 +0530 | [diff] [blame] | 112 | .name = "ARConnect GFRC", |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 113 | .rating = 400, |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 114 | .read = arc_read_gfrc, |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 115 | .mask = CLOCKSOURCE_MASK(64), |
| 116 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 117 | }; |
| 118 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 119 | static int __init arc_cs_setup_gfrc(struct device_node *node) |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 120 | { |
| 121 | int exists = cpuinfo_arc700[0].extn.gfrc; |
| 122 | int ret; |
| 123 | |
| 124 | if (WARN(!exists, "Global-64-bit-Ctr clocksource not detected")) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 125 | return -ENXIO; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 126 | |
| 127 | ret = arc_get_timer_clk(node); |
| 128 | if (ret) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 129 | return ret; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 130 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 131 | return clocksource_register_hz(&arc_counter_gfrc, arc_timer_freq); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 132 | } |
Daniel Lezcano | 177cf6e | 2016-06-07 00:27:44 +0200 | [diff] [blame^] | 133 | CLOCKSOURCE_OF_DECLARE(arc_gfrc, "snps,archs-timer-gfrc", arc_cs_setup_gfrc); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 134 | |
| 135 | #endif |
Vineet Gupta | 72d7288 | 2014-12-24 18:41:55 +0530 | [diff] [blame] | 136 | |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 137 | #ifdef CONFIG_ARC_HAS_RTC |
| 138 | |
| 139 | #define AUX_RTC_CTRL 0x103 |
| 140 | #define AUX_RTC_LOW 0x104 |
| 141 | #define AUX_RTC_HIGH 0x105 |
| 142 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 143 | static cycle_t arc_read_rtc(struct clocksource *cs) |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 144 | { |
| 145 | unsigned long status; |
| 146 | union { |
| 147 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 148 | struct { u32 high, low; }; |
| 149 | #else |
| 150 | struct { u32 low, high; }; |
| 151 | #endif |
| 152 | cycle_t full; |
| 153 | } stamp; |
| 154 | |
| 155 | |
| 156 | __asm__ __volatile( |
| 157 | "1: \n" |
| 158 | " lr %0, [AUX_RTC_LOW] \n" |
| 159 | " lr %1, [AUX_RTC_HIGH] \n" |
| 160 | " lr %2, [AUX_RTC_CTRL] \n" |
| 161 | " bbit0.nt %2, 31, 1b \n" |
| 162 | : "=r" (stamp.low), "=r" (stamp.high), "=r" (status)); |
| 163 | |
| 164 | return stamp.full; |
| 165 | } |
| 166 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 167 | static struct clocksource arc_counter_rtc = { |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 168 | .name = "ARCv2 RTC", |
| 169 | .rating = 350, |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 170 | .read = arc_read_rtc, |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 171 | .mask = CLOCKSOURCE_MASK(64), |
| 172 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 173 | }; |
| 174 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 175 | static int __init arc_cs_setup_rtc(struct device_node *node) |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 176 | { |
| 177 | int exists = cpuinfo_arc700[smp_processor_id()].extn.rtc; |
| 178 | int ret; |
| 179 | |
| 180 | if (WARN(!exists, "Local-64-bit-Ctr clocksource not detected")) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 181 | return -ENXIO; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 182 | |
| 183 | /* Local to CPU hence not usable in SMP */ |
| 184 | if (WARN(IS_ENABLED(CONFIG_SMP), "Local-64-bit-Ctr not usable in SMP")) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 185 | return -EINVAL; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 186 | |
| 187 | ret = arc_get_timer_clk(node); |
| 188 | if (ret) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 189 | return ret; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 190 | |
| 191 | write_aux_reg(AUX_RTC_CTRL, 1); |
| 192 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 193 | return clocksource_register_hz(&arc_counter_rtc, arc_timer_freq); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 194 | } |
Daniel Lezcano | 177cf6e | 2016-06-07 00:27:44 +0200 | [diff] [blame^] | 195 | CLOCKSOURCE_OF_DECLARE(arc_rtc, "snps,archs-timer-rtc", arc_cs_setup_rtc); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 196 | |
| 197 | #endif |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 198 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 199 | /* |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 200 | * 32bit TIMER1 to keep counting monotonically and wraparound |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 201 | */ |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 202 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 203 | static cycle_t arc_read_timer1(struct clocksource *cs) |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 204 | { |
| 205 | return (cycle_t) read_aux_reg(ARC_REG_TIMER1_CNT); |
| 206 | } |
| 207 | |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 208 | static struct clocksource arc_counter_timer1 = { |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 209 | .name = "ARC Timer1", |
| 210 | .rating = 300, |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 211 | .read = arc_read_timer1, |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 212 | .mask = CLOCKSOURCE_MASK(32), |
| 213 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 214 | }; |
| 215 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 216 | static int __init arc_cs_setup_timer1(struct device_node *node) |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 217 | { |
| 218 | int ret; |
| 219 | |
| 220 | /* Local to CPU hence not usable in SMP */ |
| 221 | if (IS_ENABLED(CONFIG_SMP)) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 222 | return -EINVAL; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 223 | |
| 224 | ret = arc_get_timer_clk(node); |
| 225 | if (ret) |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 226 | return ret; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 227 | |
| 228 | write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMER_MAX); |
| 229 | write_aux_reg(ARC_REG_TIMER1_CNT, 0); |
| 230 | write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH); |
| 231 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 232 | return clocksource_register_hz(&arc_counter_timer1, arc_timer_freq); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 233 | } |
Vineet Gupta | aa93e8e | 2013-11-07 14:57:16 +0530 | [diff] [blame] | 234 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 235 | /********** Clock Event Device *********/ |
| 236 | |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 237 | static int arc_timer_irq; |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 238 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 239 | /* |
Vineet Gupta | c9a98e18 | 2014-06-25 17:14:03 +0530 | [diff] [blame] | 240 | * Arm the timer to interrupt after @cycles |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 241 | * The distinction for oneshot/periodic is done in arc_event_timer_ack() below |
| 242 | */ |
Vineet Gupta | c9a98e18 | 2014-06-25 17:14:03 +0530 | [diff] [blame] | 243 | static void arc_timer_event_setup(unsigned int cycles) |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 244 | { |
Vineet Gupta | c9a98e18 | 2014-06-25 17:14:03 +0530 | [diff] [blame] | 245 | write_aux_reg(ARC_REG_TIMER0_LIMIT, cycles); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 246 | write_aux_reg(ARC_REG_TIMER0_CNT, 0); /* start from 0 */ |
| 247 | |
| 248 | write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH); |
| 249 | } |
| 250 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 251 | |
| 252 | static int arc_clkevent_set_next_event(unsigned long delta, |
| 253 | struct clock_event_device *dev) |
| 254 | { |
| 255 | arc_timer_event_setup(delta); |
| 256 | return 0; |
| 257 | } |
| 258 | |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 259 | static int arc_clkevent_set_periodic(struct clock_event_device *dev) |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 260 | { |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 261 | /* |
| 262 | * At X Hz, 1 sec = 1000ms -> X cycles; |
| 263 | * 10ms -> X / 100 cycles |
| 264 | */ |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 265 | arc_timer_event_setup(arc_timer_freq / HZ); |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 266 | return 0; |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static DEFINE_PER_CPU(struct clock_event_device, arc_clockevent_device) = { |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 270 | .name = "ARC Timer0", |
| 271 | .features = CLOCK_EVT_FEAT_ONESHOT | |
| 272 | CLOCK_EVT_FEAT_PERIODIC, |
| 273 | .rating = 300, |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 274 | .set_next_event = arc_clkevent_set_next_event, |
| 275 | .set_state_periodic = arc_clkevent_set_periodic, |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 276 | }; |
| 277 | |
| 278 | static irqreturn_t timer_irq_handler(int irq, void *dev_id) |
| 279 | { |
Vineet Gupta | f8b34c3 | 2014-01-25 00:42:37 +0530 | [diff] [blame] | 280 | /* |
| 281 | * Note that generic IRQ core could have passed @evt for @dev_id if |
| 282 | * irq_set_chip_and_handler() asked for handle_percpu_devid_irq() |
| 283 | */ |
| 284 | struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device); |
Viresh Kumar | aeec6cd | 2015-07-16 16:56:14 +0530 | [diff] [blame] | 285 | int irq_reenable = clockevent_state_periodic(evt); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 286 | |
Vineet Gupta | f8b34c3 | 2014-01-25 00:42:37 +0530 | [diff] [blame] | 287 | /* |
| 288 | * Any write to CTRL reg ACks the interrupt, we rewrite the |
| 289 | * Count when [N]ot [H]alted bit. |
| 290 | * And re-arm it if perioid by [I]nterrupt [E]nable bit |
| 291 | */ |
| 292 | write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH); |
| 293 | |
| 294 | evt->event_handler(evt); |
| 295 | |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 296 | return IRQ_HANDLED; |
| 297 | } |
| 298 | |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 299 | static int arc_timer_cpu_notify(struct notifier_block *self, |
| 300 | unsigned long action, void *hcpu) |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 301 | { |
Vineet Gupta | 2d4899f | 2014-05-08 14:06:38 +0530 | [diff] [blame] | 302 | struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 303 | |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 304 | evt->cpumask = cpumask_of(smp_processor_id()); |
| 305 | |
| 306 | switch (action & ~CPU_TASKS_FROZEN) { |
| 307 | case CPU_STARTING: |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 308 | clockevents_config_and_register(evt, arc_timer_freq, |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 309 | 0, ULONG_MAX); |
| 310 | enable_percpu_irq(arc_timer_irq, 0); |
| 311 | break; |
| 312 | case CPU_DYING: |
| 313 | disable_percpu_irq(arc_timer_irq); |
| 314 | break; |
| 315 | } |
| 316 | |
| 317 | return NOTIFY_OK; |
| 318 | } |
| 319 | |
| 320 | static struct notifier_block arc_timer_cpu_nb = { |
| 321 | .notifier_call = arc_timer_cpu_notify, |
| 322 | }; |
| 323 | |
| 324 | /* |
| 325 | * clockevent setup for boot CPU |
| 326 | */ |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 327 | static int __init arc_clockevent_setup(struct device_node *node) |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 328 | { |
| 329 | struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device); |
| 330 | int ret; |
| 331 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 332 | ret = register_cpu_notifier(&arc_timer_cpu_nb); |
| 333 | if (ret) { |
| 334 | pr_err("Failed to register cpu notifier"); |
| 335 | return ret; |
| 336 | } |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 337 | |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 338 | arc_timer_irq = irq_of_parse_and_map(node, 0); |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 339 | if (arc_timer_irq <= 0) { |
| 340 | pr_err("clockevent: missing irq"); |
| 341 | return -EINVAL; |
| 342 | } |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 343 | |
| 344 | ret = arc_get_timer_clk(node); |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 345 | if (ret) { |
| 346 | pr_err("clockevent: missing clk"); |
| 347 | return ret; |
| 348 | } |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 349 | |
| 350 | evt->irq = arc_timer_irq; |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 351 | evt->cpumask = cpumask_of(smp_processor_id()); |
Vineet Gupta | 77c8d0d | 2016-01-01 17:58:45 +0530 | [diff] [blame] | 352 | clockevents_config_and_register(evt, arc_timer_freq, |
Uwe Kleine-König | 55c2e26 | 2013-09-24 23:05:37 +0200 | [diff] [blame] | 353 | 0, ARC_TIMER_MAX); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 354 | |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 355 | /* Needs apriori irq_set_percpu_devid() done in intc map function */ |
| 356 | ret = request_percpu_irq(arc_timer_irq, timer_irq_handler, |
| 357 | "Timer0 (per-cpu-tick)", evt); |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 358 | if (ret) { |
| 359 | pr_err("clockevent: unable to request irq\n"); |
| 360 | return ret; |
| 361 | } |
Vineet Gupta | 5695794 | 2016-01-28 12:56:03 +0530 | [diff] [blame] | 362 | |
Noam Camus | eec3c58 | 2016-01-01 15:48:49 +0530 | [diff] [blame] | 363 | enable_percpu_irq(arc_timer_irq, 0); |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 364 | |
| 365 | return 0; |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 366 | } |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 367 | |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 368 | static int __init arc_of_timer_init(struct device_node *np) |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 369 | { |
| 370 | static int init_count = 0; |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 371 | int ret; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 372 | |
| 373 | if (!init_count) { |
| 374 | init_count = 1; |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 375 | ret = arc_clockevent_setup(np); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 376 | } else { |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 377 | ret = arc_cs_setup_timer1(np); |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 378 | } |
Daniel Lezcano | 43d7560 | 2016-06-15 14:50:12 +0200 | [diff] [blame] | 379 | |
| 380 | return ret; |
Vineet Gupta | e608b53 | 2016-01-01 18:05:48 +0530 | [diff] [blame] | 381 | } |
Daniel Lezcano | 177cf6e | 2016-06-07 00:27:44 +0200 | [diff] [blame^] | 382 | CLOCKSOURCE_OF_DECLARE(arc_clkevt, "snps,arc-timer", arc_of_timer_init); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 383 | |
| 384 | /* |
| 385 | * Called from start_kernel() - boot CPU only |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 386 | */ |
| 387 | void __init time_init(void) |
| 388 | { |
Noam Camus | 69fbd09 | 2016-01-14 12:20:08 +0530 | [diff] [blame] | 389 | of_clk_init(NULL); |
| 390 | clocksource_probe(); |
Vineet Gupta | d8005e6 | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 391 | } |