Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 1 | /* linux/arch/arm/mach-exynos4/mct.c |
| 2 | * |
| 3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| 4 | * http://www.samsung.com |
| 5 | * |
| 6 | * EXYNOS4 MCT(Multi-Core Timer) support |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/irq.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/clk.h> |
| 18 | #include <linux/clockchips.h> |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 19 | #include <linux/cpu.h> |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/percpu.h> |
Kukjin Kim | 2edb36c | 2012-11-15 15:48:56 +0900 | [diff] [blame] | 23 | #include <linux/of.h> |
Thomas Abraham | 36ba5d5 | 2013-03-09 16:01:52 +0900 | [diff] [blame] | 24 | #include <linux/of_irq.h> |
| 25 | #include <linux/of_address.h> |
Thomas Abraham | 9fbf0c8 | 2013-03-09 16:10:03 +0900 | [diff] [blame] | 26 | #include <linux/clocksource.h> |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 27 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 28 | #define EXYNOS4_MCTREG(x) (x) |
| 29 | #define EXYNOS4_MCT_G_CNT_L EXYNOS4_MCTREG(0x100) |
| 30 | #define EXYNOS4_MCT_G_CNT_U EXYNOS4_MCTREG(0x104) |
| 31 | #define EXYNOS4_MCT_G_CNT_WSTAT EXYNOS4_MCTREG(0x110) |
| 32 | #define EXYNOS4_MCT_G_COMP0_L EXYNOS4_MCTREG(0x200) |
| 33 | #define EXYNOS4_MCT_G_COMP0_U EXYNOS4_MCTREG(0x204) |
| 34 | #define EXYNOS4_MCT_G_COMP0_ADD_INCR EXYNOS4_MCTREG(0x208) |
| 35 | #define EXYNOS4_MCT_G_TCON EXYNOS4_MCTREG(0x240) |
| 36 | #define EXYNOS4_MCT_G_INT_CSTAT EXYNOS4_MCTREG(0x244) |
| 37 | #define EXYNOS4_MCT_G_INT_ENB EXYNOS4_MCTREG(0x248) |
| 38 | #define EXYNOS4_MCT_G_WSTAT EXYNOS4_MCTREG(0x24C) |
| 39 | #define _EXYNOS4_MCT_L_BASE EXYNOS4_MCTREG(0x300) |
| 40 | #define EXYNOS4_MCT_L_BASE(x) (_EXYNOS4_MCT_L_BASE + (0x100 * x)) |
| 41 | #define EXYNOS4_MCT_L_MASK (0xffffff00) |
| 42 | |
| 43 | #define MCT_L_TCNTB_OFFSET (0x00) |
| 44 | #define MCT_L_ICNTB_OFFSET (0x08) |
| 45 | #define MCT_L_TCON_OFFSET (0x20) |
| 46 | #define MCT_L_INT_CSTAT_OFFSET (0x30) |
| 47 | #define MCT_L_INT_ENB_OFFSET (0x34) |
| 48 | #define MCT_L_WSTAT_OFFSET (0x40) |
| 49 | #define MCT_G_TCON_START (1 << 8) |
| 50 | #define MCT_G_TCON_COMP0_AUTO_INC (1 << 1) |
| 51 | #define MCT_G_TCON_COMP0_ENABLE (1 << 0) |
| 52 | #define MCT_L_TCON_INTERVAL_MODE (1 << 2) |
| 53 | #define MCT_L_TCON_INT_START (1 << 1) |
| 54 | #define MCT_L_TCON_TIMER_START (1 << 0) |
| 55 | |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 56 | #define TICK_BASE_CNT 1 |
| 57 | |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 58 | enum { |
| 59 | MCT_INT_SPI, |
| 60 | MCT_INT_PPI |
| 61 | }; |
| 62 | |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 63 | enum { |
| 64 | MCT_G0_IRQ, |
| 65 | MCT_G1_IRQ, |
| 66 | MCT_G2_IRQ, |
| 67 | MCT_G3_IRQ, |
| 68 | MCT_L0_IRQ, |
| 69 | MCT_L1_IRQ, |
| 70 | MCT_L2_IRQ, |
| 71 | MCT_L3_IRQ, |
Chander Kashyap | 6c16ded | 2013-12-02 07:48:23 +0900 | [diff] [blame] | 72 | MCT_L4_IRQ, |
| 73 | MCT_L5_IRQ, |
| 74 | MCT_L6_IRQ, |
| 75 | MCT_L7_IRQ, |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 76 | MCT_NR_IRQS, |
| 77 | }; |
| 78 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 79 | static void __iomem *reg_base; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 80 | static unsigned long clk_rate; |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 81 | static unsigned int mct_int_type; |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 82 | static int mct_irqs[MCT_NR_IRQS]; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 83 | |
| 84 | struct mct_clock_event_device { |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 85 | struct clock_event_device evt; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 86 | unsigned long base; |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 87 | char name[10]; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 88 | }; |
| 89 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 90 | static void exynos4_mct_write(unsigned int value, unsigned long offset) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 91 | { |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 92 | unsigned long stat_addr; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 93 | u32 mask; |
| 94 | u32 i; |
| 95 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 96 | __raw_writel(value, reg_base + offset); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 97 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 98 | if (likely(offset >= EXYNOS4_MCT_L_BASE(0))) { |
| 99 | stat_addr = (offset & ~EXYNOS4_MCT_L_MASK) + MCT_L_WSTAT_OFFSET; |
| 100 | switch (offset & EXYNOS4_MCT_L_MASK) { |
| 101 | case MCT_L_TCON_OFFSET: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 102 | mask = 1 << 3; /* L_TCON write status */ |
| 103 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 104 | case MCT_L_ICNTB_OFFSET: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 105 | mask = 1 << 1; /* L_ICNTB write status */ |
| 106 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 107 | case MCT_L_TCNTB_OFFSET: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 108 | mask = 1 << 0; /* L_TCNTB write status */ |
| 109 | break; |
| 110 | default: |
| 111 | return; |
| 112 | } |
| 113 | } else { |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 114 | switch (offset) { |
| 115 | case EXYNOS4_MCT_G_TCON: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 116 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
| 117 | mask = 1 << 16; /* G_TCON write status */ |
| 118 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 119 | case EXYNOS4_MCT_G_COMP0_L: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 120 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
| 121 | mask = 1 << 0; /* G_COMP0_L write status */ |
| 122 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 123 | case EXYNOS4_MCT_G_COMP0_U: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 124 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
| 125 | mask = 1 << 1; /* G_COMP0_U write status */ |
| 126 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 127 | case EXYNOS4_MCT_G_COMP0_ADD_INCR: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 128 | stat_addr = EXYNOS4_MCT_G_WSTAT; |
| 129 | mask = 1 << 2; /* G_COMP0_ADD_INCR w status */ |
| 130 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 131 | case EXYNOS4_MCT_G_CNT_L: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 132 | stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; |
| 133 | mask = 1 << 0; /* G_CNT_L write status */ |
| 134 | break; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 135 | case EXYNOS4_MCT_G_CNT_U: |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 136 | stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; |
| 137 | mask = 1 << 1; /* G_CNT_U write status */ |
| 138 | break; |
| 139 | default: |
| 140 | return; |
| 141 | } |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | /* Wait maximum 1 ms until written values are applied */ |
| 145 | for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++) |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 146 | if (__raw_readl(reg_base + stat_addr) & mask) { |
| 147 | __raw_writel(mask, reg_base + stat_addr); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 148 | return; |
| 149 | } |
| 150 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 151 | panic("MCT hangs after writing %d (offset:0x%lx)\n", value, offset); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /* Clocksource handling */ |
| 155 | static void exynos4_mct_frc_start(u32 hi, u32 lo) |
| 156 | { |
| 157 | u32 reg; |
| 158 | |
| 159 | exynos4_mct_write(lo, EXYNOS4_MCT_G_CNT_L); |
| 160 | exynos4_mct_write(hi, EXYNOS4_MCT_G_CNT_U); |
| 161 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 162 | reg = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 163 | reg |= MCT_G_TCON_START; |
| 164 | exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON); |
| 165 | } |
| 166 | |
| 167 | static cycle_t exynos4_frc_read(struct clocksource *cs) |
| 168 | { |
| 169 | unsigned int lo, hi; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 170 | u32 hi2 = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_U); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 171 | |
| 172 | do { |
| 173 | hi = hi2; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 174 | lo = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_L); |
| 175 | hi2 = __raw_readl(reg_base + EXYNOS4_MCT_G_CNT_U); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 176 | } while (hi != hi2); |
| 177 | |
| 178 | return ((cycle_t)hi << 32) | lo; |
| 179 | } |
| 180 | |
Changhwan Youn | aa421c1 | 2011-09-02 14:10:52 +0900 | [diff] [blame] | 181 | static void exynos4_frc_resume(struct clocksource *cs) |
| 182 | { |
| 183 | exynos4_mct_frc_start(0, 0); |
| 184 | } |
| 185 | |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 186 | struct clocksource mct_frc = { |
| 187 | .name = "mct-frc", |
| 188 | .rating = 400, |
| 189 | .read = exynos4_frc_read, |
| 190 | .mask = CLOCKSOURCE_MASK(64), |
| 191 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
Changhwan Youn | aa421c1 | 2011-09-02 14:10:52 +0900 | [diff] [blame] | 192 | .resume = exynos4_frc_resume, |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 193 | }; |
| 194 | |
| 195 | static void __init exynos4_clocksource_init(void) |
| 196 | { |
| 197 | exynos4_mct_frc_start(0, 0); |
| 198 | |
| 199 | if (clocksource_register_hz(&mct_frc, clk_rate)) |
| 200 | panic("%s: can't register clocksource\n", mct_frc.name); |
| 201 | } |
| 202 | |
| 203 | static void exynos4_mct_comp0_stop(void) |
| 204 | { |
| 205 | unsigned int tcon; |
| 206 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 207 | tcon = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 208 | tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC); |
| 209 | |
| 210 | exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON); |
| 211 | exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB); |
| 212 | } |
| 213 | |
| 214 | static void exynos4_mct_comp0_start(enum clock_event_mode mode, |
| 215 | unsigned long cycles) |
| 216 | { |
| 217 | unsigned int tcon; |
| 218 | cycle_t comp_cycle; |
| 219 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 220 | tcon = __raw_readl(reg_base + EXYNOS4_MCT_G_TCON); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 221 | |
| 222 | if (mode == CLOCK_EVT_MODE_PERIODIC) { |
| 223 | tcon |= MCT_G_TCON_COMP0_AUTO_INC; |
| 224 | exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR); |
| 225 | } |
| 226 | |
| 227 | comp_cycle = exynos4_frc_read(&mct_frc) + cycles; |
| 228 | exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L); |
| 229 | exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U); |
| 230 | |
| 231 | exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB); |
| 232 | |
| 233 | tcon |= MCT_G_TCON_COMP0_ENABLE; |
| 234 | exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON); |
| 235 | } |
| 236 | |
| 237 | static int exynos4_comp_set_next_event(unsigned long cycles, |
| 238 | struct clock_event_device *evt) |
| 239 | { |
| 240 | exynos4_mct_comp0_start(evt->mode, cycles); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static void exynos4_comp_set_mode(enum clock_event_mode mode, |
| 246 | struct clock_event_device *evt) |
| 247 | { |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 248 | unsigned long cycles_per_jiffy; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 249 | exynos4_mct_comp0_stop(); |
| 250 | |
| 251 | switch (mode) { |
| 252 | case CLOCK_EVT_MODE_PERIODIC: |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 253 | cycles_per_jiffy = |
| 254 | (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); |
| 255 | exynos4_mct_comp0_start(mode, cycles_per_jiffy); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 256 | break; |
| 257 | |
| 258 | case CLOCK_EVT_MODE_ONESHOT: |
| 259 | case CLOCK_EVT_MODE_UNUSED: |
| 260 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 261 | case CLOCK_EVT_MODE_RESUME: |
| 262 | break; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | static struct clock_event_device mct_comp_device = { |
| 267 | .name = "mct-comp", |
| 268 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
| 269 | .rating = 250, |
| 270 | .set_next_event = exynos4_comp_set_next_event, |
| 271 | .set_mode = exynos4_comp_set_mode, |
| 272 | }; |
| 273 | |
| 274 | static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id) |
| 275 | { |
| 276 | struct clock_event_device *evt = dev_id; |
| 277 | |
| 278 | exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT); |
| 279 | |
| 280 | evt->event_handler(evt); |
| 281 | |
| 282 | return IRQ_HANDLED; |
| 283 | } |
| 284 | |
| 285 | static struct irqaction mct_comp_event_irq = { |
| 286 | .name = "mct_comp_irq", |
| 287 | .flags = IRQF_TIMER | IRQF_IRQPOLL, |
| 288 | .handler = exynos4_mct_comp_isr, |
| 289 | .dev_id = &mct_comp_device, |
| 290 | }; |
| 291 | |
| 292 | static void exynos4_clockevent_init(void) |
| 293 | { |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 294 | mct_comp_device.cpumask = cpumask_of(0); |
Shawn Guo | 838a2ae | 2013-01-12 11:50:05 +0000 | [diff] [blame] | 295 | clockevents_config_and_register(&mct_comp_device, clk_rate, |
| 296 | 0xf, 0xffffffff); |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 297 | setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 298 | } |
| 299 | |
Kukjin Kim | 991a6c7 | 2011-12-08 10:04:49 +0900 | [diff] [blame] | 300 | static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick); |
| 301 | |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 302 | /* Clock event handling */ |
| 303 | static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt) |
| 304 | { |
| 305 | unsigned long tmp; |
| 306 | unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 307 | unsigned long offset = mevt->base + MCT_L_TCON_OFFSET; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 308 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 309 | tmp = __raw_readl(reg_base + offset); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 310 | if (tmp & mask) { |
| 311 | tmp &= ~mask; |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 312 | exynos4_mct_write(tmp, offset); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 313 | } |
| 314 | } |
| 315 | |
| 316 | static void exynos4_mct_tick_start(unsigned long cycles, |
| 317 | struct mct_clock_event_device *mevt) |
| 318 | { |
| 319 | unsigned long tmp; |
| 320 | |
| 321 | exynos4_mct_tick_stop(mevt); |
| 322 | |
| 323 | tmp = (1 << 31) | cycles; /* MCT_L_UPDATE_ICNTB */ |
| 324 | |
| 325 | /* update interrupt count buffer */ |
| 326 | exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET); |
| 327 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 328 | /* enable MCT tick interrupt */ |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 329 | exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET); |
| 330 | |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 331 | tmp = __raw_readl(reg_base + mevt->base + MCT_L_TCON_OFFSET); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 332 | tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START | |
| 333 | MCT_L_TCON_INTERVAL_MODE; |
| 334 | exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET); |
| 335 | } |
| 336 | |
| 337 | static int exynos4_tick_set_next_event(unsigned long cycles, |
| 338 | struct clock_event_device *evt) |
| 339 | { |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 340 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 341 | |
| 342 | exynos4_mct_tick_start(cycles, mevt); |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static inline void exynos4_tick_set_mode(enum clock_event_mode mode, |
| 348 | struct clock_event_device *evt) |
| 349 | { |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 350 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 351 | unsigned long cycles_per_jiffy; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 352 | |
| 353 | exynos4_mct_tick_stop(mevt); |
| 354 | |
| 355 | switch (mode) { |
| 356 | case CLOCK_EVT_MODE_PERIODIC: |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 357 | cycles_per_jiffy = |
| 358 | (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); |
| 359 | exynos4_mct_tick_start(cycles_per_jiffy, mevt); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 360 | break; |
| 361 | |
| 362 | case CLOCK_EVT_MODE_ONESHOT: |
| 363 | case CLOCK_EVT_MODE_UNUSED: |
| 364 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 365 | case CLOCK_EVT_MODE_RESUME: |
| 366 | break; |
| 367 | } |
| 368 | } |
| 369 | |
Changhwan Youn | c898747 | 2011-10-04 17:09:26 +0900 | [diff] [blame] | 370 | static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 371 | { |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 372 | struct clock_event_device *evt = &mevt->evt; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 373 | |
| 374 | /* |
| 375 | * This is for supporting oneshot mode. |
| 376 | * Mct would generate interrupt periodically |
| 377 | * without explicit stopping. |
| 378 | */ |
| 379 | if (evt->mode != CLOCK_EVT_MODE_PERIODIC) |
| 380 | exynos4_mct_tick_stop(mevt); |
| 381 | |
| 382 | /* Clear the MCT tick interrupt */ |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 383 | if (__raw_readl(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1) { |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 384 | exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET); |
| 385 | return 1; |
| 386 | } else { |
| 387 | return 0; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id) |
| 392 | { |
| 393 | struct mct_clock_event_device *mevt = dev_id; |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 394 | struct clock_event_device *evt = &mevt->evt; |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 395 | |
| 396 | exynos4_mct_tick_clear(mevt); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 397 | |
| 398 | evt->event_handler(evt); |
| 399 | |
| 400 | return IRQ_HANDLED; |
| 401 | } |
| 402 | |
Paul Gortmaker | 8c37bb3 | 2013-06-19 11:32:08 -0400 | [diff] [blame] | 403 | static int exynos4_local_timer_setup(struct clock_event_device *evt) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 404 | { |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 405 | struct mct_clock_event_device *mevt; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 406 | unsigned int cpu = smp_processor_id(); |
| 407 | |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 408 | mevt = container_of(evt, struct mct_clock_event_device, evt); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 409 | |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 410 | mevt->base = EXYNOS4_MCT_L_BASE(cpu); |
Dan Carpenter | 09e1517 | 2014-03-01 16:57:14 +0300 | [diff] [blame] | 411 | snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 412 | |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 413 | evt->name = mevt->name; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 414 | evt->cpumask = cpumask_of(cpu); |
| 415 | evt->set_next_event = exynos4_tick_set_next_event; |
| 416 | evt->set_mode = exynos4_tick_set_mode; |
| 417 | evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; |
| 418 | evt->rating = 450; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 419 | |
Changhwan Youn | 4d2e4d7 | 2012-03-09 15:09:21 -0800 | [diff] [blame] | 420 | exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 421 | |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 422 | if (mct_int_type == MCT_INT_SPI) { |
Chander Kashyap | 7114cd7 | 2013-06-19 00:29:35 +0900 | [diff] [blame] | 423 | evt->irq = mct_irqs[MCT_L0_IRQ + cpu]; |
| 424 | if (request_irq(evt->irq, exynos4_mct_tick_isr, |
| 425 | IRQF_TIMER | IRQF_NOBALANCING, |
| 426 | evt->name, mevt)) { |
| 427 | pr_err("exynos-mct: cannot register IRQ %d\n", |
| 428 | evt->irq); |
| 429 | return -EIO; |
Changhwan Youn | 3a06228 | 2011-10-04 17:02:58 +0900 | [diff] [blame] | 430 | } |
Thomas Gleixner | 30ccf03 | 2014-04-16 14:36:45 +0000 | [diff] [blame] | 431 | irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu)); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 432 | } else { |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 433 | enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 434 | } |
Krzysztof Kozlowski | 8db6e51 | 2014-04-16 14:36:45 +0000 | [diff] [blame^] | 435 | clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1), |
| 436 | 0xf, 0x7fffffff); |
Kukjin Kim | 4d487d7 | 2011-08-24 16:07:39 +0900 | [diff] [blame] | 437 | |
| 438 | return 0; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 439 | } |
| 440 | |
Marc Zyngier | a8cb604 | 2012-01-10 19:44:19 +0000 | [diff] [blame] | 441 | static void exynos4_local_timer_stop(struct clock_event_device *evt) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 442 | { |
Marc Zyngier | 28af690 | 2011-07-22 12:52:37 +0100 | [diff] [blame] | 443 | evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 444 | if (mct_int_type == MCT_INT_SPI) |
Chander Kashyap | 7114cd7 | 2013-06-19 00:29:35 +0900 | [diff] [blame] | 445 | free_irq(evt->irq, this_cpu_ptr(&percpu_mct_tick)); |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 446 | else |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 447 | disable_percpu_irq(mct_irqs[MCT_L0_IRQ]); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 448 | } |
Marc Zyngier | a8cb604 | 2012-01-10 19:44:19 +0000 | [diff] [blame] | 449 | |
Olof Johansson | 47dcd35 | 2013-07-23 14:51:34 -0700 | [diff] [blame] | 450 | static int exynos4_mct_cpu_notify(struct notifier_block *self, |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 451 | unsigned long action, void *hcpu) |
| 452 | { |
| 453 | struct mct_clock_event_device *mevt; |
| 454 | |
| 455 | /* |
| 456 | * Grab cpu pointer in each case to avoid spurious |
| 457 | * preemptible warnings |
| 458 | */ |
| 459 | switch (action & ~CPU_TASKS_FROZEN) { |
| 460 | case CPU_STARTING: |
| 461 | mevt = this_cpu_ptr(&percpu_mct_tick); |
| 462 | exynos4_local_timer_setup(&mevt->evt); |
| 463 | break; |
| 464 | case CPU_DYING: |
| 465 | mevt = this_cpu_ptr(&percpu_mct_tick); |
| 466 | exynos4_local_timer_stop(&mevt->evt); |
| 467 | break; |
| 468 | } |
| 469 | |
| 470 | return NOTIFY_OK; |
| 471 | } |
| 472 | |
Olof Johansson | 47dcd35 | 2013-07-23 14:51:34 -0700 | [diff] [blame] | 473 | static struct notifier_block exynos4_mct_cpu_nb = { |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 474 | .notifier_call = exynos4_mct_cpu_notify, |
Marc Zyngier | a8cb604 | 2012-01-10 19:44:19 +0000 | [diff] [blame] | 475 | }; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 476 | |
Arnd Bergmann | 19ce4f4 | 2013-04-09 22:24:06 +0200 | [diff] [blame] | 477 | static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 478 | { |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 479 | int err; |
| 480 | struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); |
Thomas Abraham | ca9048e | 2013-03-09 17:10:37 +0900 | [diff] [blame] | 481 | struct clk *mct_clk, *tick_clk; |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 482 | |
Thomas Abraham | 415ac2e | 2013-03-09 17:10:31 +0900 | [diff] [blame] | 483 | tick_clk = np ? of_clk_get_by_name(np, "fin_pll") : |
| 484 | clk_get(NULL, "fin_pll"); |
| 485 | if (IS_ERR(tick_clk)) |
| 486 | panic("%s: unable to determine tick clock rate\n", __func__); |
| 487 | clk_rate = clk_get_rate(tick_clk); |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 488 | |
Thomas Abraham | ca9048e | 2013-03-09 17:10:37 +0900 | [diff] [blame] | 489 | mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct"); |
| 490 | if (IS_ERR(mct_clk)) |
| 491 | panic("%s: unable to retrieve mct clock instance\n", __func__); |
| 492 | clk_prepare_enable(mct_clk); |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 493 | |
Arnd Bergmann | 228e302 | 2013-04-09 22:07:37 +0200 | [diff] [blame] | 494 | reg_base = base; |
Thomas Abraham | 36ba5d5 | 2013-03-09 16:01:52 +0900 | [diff] [blame] | 495 | if (!reg_base) |
| 496 | panic("%s: unable to ioremap mct address space\n", __func__); |
Thomas Abraham | a1ba7a7 | 2013-03-09 16:01:47 +0900 | [diff] [blame] | 497 | |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 498 | if (mct_int_type == MCT_INT_PPI) { |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 499 | |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 500 | err = request_percpu_irq(mct_irqs[MCT_L0_IRQ], |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 501 | exynos4_mct_tick_isr, "MCT", |
| 502 | &percpu_mct_tick); |
| 503 | WARN(err, "MCT: can't request IRQ %d (%d)\n", |
Thomas Abraham | c371dc6 | 2013-03-09 16:01:50 +0900 | [diff] [blame] | 504 | mct_irqs[MCT_L0_IRQ], err); |
Tomasz Figa | 5df718d | 2013-09-25 12:00:59 +0200 | [diff] [blame] | 505 | } else { |
| 506 | irq_set_affinity(mct_irqs[MCT_L0_IRQ], cpumask_of(0)); |
Marc Zyngier | e700e41 | 2011-11-03 11:13:12 +0900 | [diff] [blame] | 507 | } |
Marc Zyngier | a8cb604 | 2012-01-10 19:44:19 +0000 | [diff] [blame] | 508 | |
Stephen Boyd | ee98d27 | 2013-02-15 16:40:51 -0800 | [diff] [blame] | 509 | err = register_cpu_notifier(&exynos4_mct_cpu_nb); |
| 510 | if (err) |
| 511 | goto out_irq; |
| 512 | |
| 513 | /* Immediately configure the timer on the boot CPU */ |
| 514 | exynos4_local_timer_setup(&mevt->evt); |
| 515 | return; |
| 516 | |
| 517 | out_irq: |
| 518 | free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 519 | } |
| 520 | |
Arnd Bergmann | 034c097 | 2013-04-10 11:35:29 +0200 | [diff] [blame] | 521 | void __init mct_init(void __iomem *base, int irq_g0, int irq_l0, int irq_l1) |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 522 | { |
Arnd Bergmann | 034c097 | 2013-04-10 11:35:29 +0200 | [diff] [blame] | 523 | mct_irqs[MCT_G0_IRQ] = irq_g0; |
| 524 | mct_irqs[MCT_L0_IRQ] = irq_l0; |
| 525 | mct_irqs[MCT_L1_IRQ] = irq_l1; |
| 526 | mct_int_type = MCT_INT_SPI; |
Kukjin Kim | 2edb36c | 2012-11-15 15:48:56 +0900 | [diff] [blame] | 527 | |
Arnd Bergmann | 034c097 | 2013-04-10 11:35:29 +0200 | [diff] [blame] | 528 | exynos4_timer_resources(NULL, base); |
Changhwan Youn | 30d8bea | 2011-03-11 10:39:57 +0900 | [diff] [blame] | 529 | exynos4_clocksource_init(); |
| 530 | exynos4_clockevent_init(); |
| 531 | } |
Arnd Bergmann | 228e302 | 2013-04-09 22:07:37 +0200 | [diff] [blame] | 532 | |
| 533 | static void __init mct_init_dt(struct device_node *np, unsigned int int_type) |
| 534 | { |
| 535 | u32 nr_irqs, i; |
| 536 | |
| 537 | mct_int_type = int_type; |
| 538 | |
| 539 | /* This driver uses only one global timer interrupt */ |
| 540 | mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ); |
| 541 | |
| 542 | /* |
| 543 | * Find out the number of local irqs specified. The local |
| 544 | * timer irqs are specified after the four global timer |
| 545 | * irqs are specified. |
| 546 | */ |
Arnd Bergmann | f4636d0 | 2013-04-19 22:00:04 +0200 | [diff] [blame] | 547 | #ifdef CONFIG_OF |
Arnd Bergmann | 228e302 | 2013-04-09 22:07:37 +0200 | [diff] [blame] | 548 | nr_irqs = of_irq_count(np); |
Arnd Bergmann | f4636d0 | 2013-04-19 22:00:04 +0200 | [diff] [blame] | 549 | #else |
| 550 | nr_irqs = 0; |
| 551 | #endif |
Arnd Bergmann | 228e302 | 2013-04-09 22:07:37 +0200 | [diff] [blame] | 552 | for (i = MCT_L0_IRQ; i < nr_irqs; i++) |
| 553 | mct_irqs[i] = irq_of_parse_and_map(np, i); |
| 554 | |
Arnd Bergmann | 19ce4f4 | 2013-04-09 22:24:06 +0200 | [diff] [blame] | 555 | exynos4_timer_resources(np, of_iomap(np, 0)); |
Arnd Bergmann | 228e302 | 2013-04-09 22:07:37 +0200 | [diff] [blame] | 556 | exynos4_clocksource_init(); |
| 557 | exynos4_clockevent_init(); |
| 558 | } |
| 559 | |
| 560 | |
| 561 | static void __init mct_init_spi(struct device_node *np) |
| 562 | { |
| 563 | return mct_init_dt(np, MCT_INT_SPI); |
| 564 | } |
| 565 | |
| 566 | static void __init mct_init_ppi(struct device_node *np) |
| 567 | { |
| 568 | return mct_init_dt(np, MCT_INT_PPI); |
| 569 | } |
| 570 | CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi); |
| 571 | CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi); |