Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/clocksource/arm_arch_timer.c |
| 3 | * |
| 4 | * Copyright (C) 2011 ARM Ltd. |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/smp.h> |
| 15 | #include <linux/cpu.h> |
Sudeep KarkadaNagesha | 346e748 | 2013-08-23 15:53:15 +0100 | [diff] [blame] | 16 | #include <linux/cpu_pm.h> |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 17 | #include <linux/clockchips.h> |
Richard Cochran | 7c8f1e7 | 2015-01-06 14:26:13 +0100 | [diff] [blame] | 18 | #include <linux/clocksource.h> |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/of_irq.h> |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 21 | #include <linux/of_address.h> |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 22 | #include <linux/io.h> |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 23 | #include <linux/slab.h> |
Stephen Boyd | 65cd4f6 | 2013-07-18 16:21:18 -0700 | [diff] [blame] | 24 | #include <linux/sched_clock.h> |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 25 | |
| 26 | #include <asm/arch_timer.h> |
Marc Zyngier | 8266891 | 2013-01-10 11:13:07 +0000 | [diff] [blame] | 27 | #include <asm/virt.h> |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 28 | |
| 29 | #include <clocksource/arm_arch_timer.h> |
| 30 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 31 | #define CNTTIDR 0x08 |
| 32 | #define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4)) |
| 33 | |
| 34 | #define CNTVCT_LO 0x08 |
| 35 | #define CNTVCT_HI 0x0c |
| 36 | #define CNTFRQ 0x10 |
| 37 | #define CNTP_TVAL 0x28 |
| 38 | #define CNTP_CTL 0x2c |
| 39 | #define CNTV_TVAL 0x38 |
| 40 | #define CNTV_CTL 0x3c |
| 41 | |
| 42 | #define ARCH_CP15_TIMER BIT(0) |
| 43 | #define ARCH_MEM_TIMER BIT(1) |
| 44 | static unsigned arch_timers_present __initdata; |
| 45 | |
| 46 | static void __iomem *arch_counter_base; |
| 47 | |
| 48 | struct arch_timer { |
| 49 | void __iomem *base; |
| 50 | struct clock_event_device evt; |
| 51 | }; |
| 52 | |
| 53 | #define to_arch_timer(e) container_of(e, struct arch_timer, evt) |
| 54 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 55 | static u32 arch_timer_rate; |
| 56 | |
| 57 | enum ppi_nr { |
| 58 | PHYS_SECURE_PPI, |
| 59 | PHYS_NONSECURE_PPI, |
| 60 | VIRT_PPI, |
| 61 | HYP_PPI, |
| 62 | MAX_TIMER_PPI |
| 63 | }; |
| 64 | |
| 65 | static int arch_timer_ppi[MAX_TIMER_PPI]; |
| 66 | |
| 67 | static struct clock_event_device __percpu *arch_timer_evt; |
| 68 | |
| 69 | static bool arch_timer_use_virtual = true; |
Lorenzo Pieralisi | 82a56194 | 2014-04-08 10:04:32 +0100 | [diff] [blame] | 70 | static bool arch_timer_c3stop; |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 71 | static bool arch_timer_mem_use_virtual; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * Architected system timer support. |
| 75 | */ |
| 76 | |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 77 | static __always_inline |
| 78 | void arch_timer_reg_write(int access, enum arch_timer_reg reg, u32 val, |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 79 | struct clock_event_device *clk) |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 80 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 81 | if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { |
| 82 | struct arch_timer *timer = to_arch_timer(clk); |
| 83 | switch (reg) { |
| 84 | case ARCH_TIMER_REG_CTRL: |
| 85 | writel_relaxed(val, timer->base + CNTP_CTL); |
| 86 | break; |
| 87 | case ARCH_TIMER_REG_TVAL: |
| 88 | writel_relaxed(val, timer->base + CNTP_TVAL); |
| 89 | break; |
| 90 | } |
| 91 | } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { |
| 92 | struct arch_timer *timer = to_arch_timer(clk); |
| 93 | switch (reg) { |
| 94 | case ARCH_TIMER_REG_CTRL: |
| 95 | writel_relaxed(val, timer->base + CNTV_CTL); |
| 96 | break; |
| 97 | case ARCH_TIMER_REG_TVAL: |
| 98 | writel_relaxed(val, timer->base + CNTV_TVAL); |
| 99 | break; |
| 100 | } |
| 101 | } else { |
| 102 | arch_timer_reg_write_cp15(access, reg, val); |
| 103 | } |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | static __always_inline |
| 107 | u32 arch_timer_reg_read(int access, enum arch_timer_reg reg, |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 108 | struct clock_event_device *clk) |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 109 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 110 | u32 val; |
| 111 | |
| 112 | if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { |
| 113 | struct arch_timer *timer = to_arch_timer(clk); |
| 114 | switch (reg) { |
| 115 | case ARCH_TIMER_REG_CTRL: |
| 116 | val = readl_relaxed(timer->base + CNTP_CTL); |
| 117 | break; |
| 118 | case ARCH_TIMER_REG_TVAL: |
| 119 | val = readl_relaxed(timer->base + CNTP_TVAL); |
| 120 | break; |
| 121 | } |
| 122 | } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { |
| 123 | struct arch_timer *timer = to_arch_timer(clk); |
| 124 | switch (reg) { |
| 125 | case ARCH_TIMER_REG_CTRL: |
| 126 | val = readl_relaxed(timer->base + CNTV_CTL); |
| 127 | break; |
| 128 | case ARCH_TIMER_REG_TVAL: |
| 129 | val = readl_relaxed(timer->base + CNTV_TVAL); |
| 130 | break; |
| 131 | } |
| 132 | } else { |
| 133 | val = arch_timer_reg_read_cp15(access, reg); |
| 134 | } |
| 135 | |
| 136 | return val; |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Stephen Boyd | e09f3cc | 2013-07-18 16:59:28 -0700 | [diff] [blame] | 139 | static __always_inline irqreturn_t timer_handler(const int access, |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 140 | struct clock_event_device *evt) |
| 141 | { |
| 142 | unsigned long ctrl; |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 143 | |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 144 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, evt); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 145 | if (ctrl & ARCH_TIMER_CTRL_IT_STAT) { |
| 146 | ctrl |= ARCH_TIMER_CTRL_IT_MASK; |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 147 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, evt); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 148 | evt->event_handler(evt); |
| 149 | return IRQ_HANDLED; |
| 150 | } |
| 151 | |
| 152 | return IRQ_NONE; |
| 153 | } |
| 154 | |
| 155 | static irqreturn_t arch_timer_handler_virt(int irq, void *dev_id) |
| 156 | { |
| 157 | struct clock_event_device *evt = dev_id; |
| 158 | |
| 159 | return timer_handler(ARCH_TIMER_VIRT_ACCESS, evt); |
| 160 | } |
| 161 | |
| 162 | static irqreturn_t arch_timer_handler_phys(int irq, void *dev_id) |
| 163 | { |
| 164 | struct clock_event_device *evt = dev_id; |
| 165 | |
| 166 | return timer_handler(ARCH_TIMER_PHYS_ACCESS, evt); |
| 167 | } |
| 168 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 169 | static irqreturn_t arch_timer_handler_phys_mem(int irq, void *dev_id) |
| 170 | { |
| 171 | struct clock_event_device *evt = dev_id; |
| 172 | |
| 173 | return timer_handler(ARCH_TIMER_MEM_PHYS_ACCESS, evt); |
| 174 | } |
| 175 | |
| 176 | static irqreturn_t arch_timer_handler_virt_mem(int irq, void *dev_id) |
| 177 | { |
| 178 | struct clock_event_device *evt = dev_id; |
| 179 | |
| 180 | return timer_handler(ARCH_TIMER_MEM_VIRT_ACCESS, evt); |
| 181 | } |
| 182 | |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 183 | static __always_inline void timer_set_mode(const int access, int mode, |
| 184 | struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 185 | { |
| 186 | unsigned long ctrl; |
| 187 | switch (mode) { |
| 188 | case CLOCK_EVT_MODE_UNUSED: |
| 189 | case CLOCK_EVT_MODE_SHUTDOWN: |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 190 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 191 | ctrl &= ~ARCH_TIMER_CTRL_ENABLE; |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 192 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 193 | break; |
| 194 | default: |
| 195 | break; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | static void arch_timer_set_mode_virt(enum clock_event_mode mode, |
| 200 | struct clock_event_device *clk) |
| 201 | { |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 202 | timer_set_mode(ARCH_TIMER_VIRT_ACCESS, mode, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void arch_timer_set_mode_phys(enum clock_event_mode mode, |
| 206 | struct clock_event_device *clk) |
| 207 | { |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 208 | timer_set_mode(ARCH_TIMER_PHYS_ACCESS, mode, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 209 | } |
| 210 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 211 | static void arch_timer_set_mode_virt_mem(enum clock_event_mode mode, |
| 212 | struct clock_event_device *clk) |
| 213 | { |
| 214 | timer_set_mode(ARCH_TIMER_MEM_VIRT_ACCESS, mode, clk); |
| 215 | } |
| 216 | |
| 217 | static void arch_timer_set_mode_phys_mem(enum clock_event_mode mode, |
| 218 | struct clock_event_device *clk) |
| 219 | { |
| 220 | timer_set_mode(ARCH_TIMER_MEM_PHYS_ACCESS, mode, clk); |
| 221 | } |
| 222 | |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 223 | static __always_inline void set_next_event(const int access, unsigned long evt, |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 224 | struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 225 | { |
| 226 | unsigned long ctrl; |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 227 | ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 228 | ctrl |= ARCH_TIMER_CTRL_ENABLE; |
| 229 | ctrl &= ~ARCH_TIMER_CTRL_IT_MASK; |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 230 | arch_timer_reg_write(access, ARCH_TIMER_REG_TVAL, evt, clk); |
| 231 | arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | static int arch_timer_set_next_event_virt(unsigned long evt, |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 235 | struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 236 | { |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 237 | set_next_event(ARCH_TIMER_VIRT_ACCESS, evt, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static int arch_timer_set_next_event_phys(unsigned long evt, |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 242 | struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 243 | { |
Stephen Boyd | 60faddf | 2013-07-18 16:59:31 -0700 | [diff] [blame] | 244 | set_next_event(ARCH_TIMER_PHYS_ACCESS, evt, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 248 | static int arch_timer_set_next_event_virt_mem(unsigned long evt, |
| 249 | struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 250 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 251 | set_next_event(ARCH_TIMER_MEM_VIRT_ACCESS, evt, clk); |
| 252 | return 0; |
| 253 | } |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 254 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 255 | static int arch_timer_set_next_event_phys_mem(unsigned long evt, |
| 256 | struct clock_event_device *clk) |
| 257 | { |
| 258 | set_next_event(ARCH_TIMER_MEM_PHYS_ACCESS, evt, clk); |
| 259 | return 0; |
| 260 | } |
| 261 | |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 262 | static void __arch_timer_setup(unsigned type, |
| 263 | struct clock_event_device *clk) |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 264 | { |
| 265 | clk->features = CLOCK_EVT_FEAT_ONESHOT; |
| 266 | |
| 267 | if (type == ARCH_CP15_TIMER) { |
Lorenzo Pieralisi | 82a56194 | 2014-04-08 10:04:32 +0100 | [diff] [blame] | 268 | if (arch_timer_c3stop) |
| 269 | clk->features |= CLOCK_EVT_FEAT_C3STOP; |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 270 | clk->name = "arch_sys_timer"; |
| 271 | clk->rating = 450; |
| 272 | clk->cpumask = cpumask_of(smp_processor_id()); |
| 273 | if (arch_timer_use_virtual) { |
| 274 | clk->irq = arch_timer_ppi[VIRT_PPI]; |
| 275 | clk->set_mode = arch_timer_set_mode_virt; |
| 276 | clk->set_next_event = arch_timer_set_next_event_virt; |
| 277 | } else { |
| 278 | clk->irq = arch_timer_ppi[PHYS_SECURE_PPI]; |
| 279 | clk->set_mode = arch_timer_set_mode_phys; |
| 280 | clk->set_next_event = arch_timer_set_next_event_phys; |
| 281 | } |
| 282 | } else { |
Stephen Boyd | 7b52ad2 | 2014-01-06 14:56:17 -0800 | [diff] [blame] | 283 | clk->features |= CLOCK_EVT_FEAT_DYNIRQ; |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 284 | clk->name = "arch_mem_timer"; |
| 285 | clk->rating = 400; |
| 286 | clk->cpumask = cpu_all_mask; |
| 287 | if (arch_timer_mem_use_virtual) { |
| 288 | clk->set_mode = arch_timer_set_mode_virt_mem; |
| 289 | clk->set_next_event = |
| 290 | arch_timer_set_next_event_virt_mem; |
| 291 | } else { |
| 292 | clk->set_mode = arch_timer_set_mode_phys_mem; |
| 293 | clk->set_next_event = |
| 294 | arch_timer_set_next_event_phys_mem; |
| 295 | } |
| 296 | } |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 297 | |
Stephen Boyd | 1ff99ea | 2013-07-18 16:59:30 -0700 | [diff] [blame] | 298 | clk->set_mode(CLOCK_EVT_MODE_SHUTDOWN, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 299 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 300 | clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff); |
| 301 | } |
| 302 | |
Nathan Lynch | e1ce5c7 | 2014-09-29 01:50:06 +0200 | [diff] [blame] | 303 | static void arch_timer_evtstrm_enable(int divider) |
| 304 | { |
| 305 | u32 cntkctl = arch_timer_get_cntkctl(); |
| 306 | |
| 307 | cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK; |
| 308 | /* Set the divider and enable virtual event stream */ |
| 309 | cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT) |
| 310 | | ARCH_TIMER_VIRT_EVT_EN; |
| 311 | arch_timer_set_cntkctl(cntkctl); |
| 312 | elf_hwcap |= HWCAP_EVTSTRM; |
| 313 | #ifdef CONFIG_COMPAT |
| 314 | compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM; |
| 315 | #endif |
| 316 | } |
| 317 | |
Will Deacon | 037f637 | 2013-08-23 15:32:29 +0100 | [diff] [blame] | 318 | static void arch_timer_configure_evtstream(void) |
| 319 | { |
| 320 | int evt_stream_div, pos; |
| 321 | |
| 322 | /* Find the closest power of two to the divisor */ |
| 323 | evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ; |
| 324 | pos = fls(evt_stream_div); |
| 325 | if (pos > 1 && !(evt_stream_div & (1 << (pos - 2)))) |
| 326 | pos--; |
| 327 | /* enable event stream */ |
| 328 | arch_timer_evtstrm_enable(min(pos, 15)); |
| 329 | } |
| 330 | |
Nathan Lynch | 8b8dde0 | 2014-09-29 01:50:06 +0200 | [diff] [blame] | 331 | static void arch_counter_set_user_access(void) |
| 332 | { |
| 333 | u32 cntkctl = arch_timer_get_cntkctl(); |
| 334 | |
| 335 | /* Disable user access to the timers and the physical counter */ |
| 336 | /* Also disable virtual event stream */ |
| 337 | cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN |
| 338 | | ARCH_TIMER_USR_VT_ACCESS_EN |
| 339 | | ARCH_TIMER_VIRT_EVT_EN |
| 340 | | ARCH_TIMER_USR_PCT_ACCESS_EN); |
| 341 | |
| 342 | /* Enable user access to the virtual counter */ |
| 343 | cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN; |
| 344 | |
| 345 | arch_timer_set_cntkctl(cntkctl); |
| 346 | } |
| 347 | |
Paul Gortmaker | 8c37bb3 | 2013-06-19 11:32:08 -0400 | [diff] [blame] | 348 | static int arch_timer_setup(struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 349 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 350 | __arch_timer_setup(ARCH_CP15_TIMER, clk); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 351 | |
| 352 | if (arch_timer_use_virtual) |
| 353 | enable_percpu_irq(arch_timer_ppi[VIRT_PPI], 0); |
| 354 | else { |
| 355 | enable_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI], 0); |
| 356 | if (arch_timer_ppi[PHYS_NONSECURE_PPI]) |
| 357 | enable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], 0); |
| 358 | } |
| 359 | |
| 360 | arch_counter_set_user_access(); |
Will Deacon | 037f637 | 2013-08-23 15:32:29 +0100 | [diff] [blame] | 361 | if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM)) |
| 362 | arch_timer_configure_evtstream(); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 367 | static void |
| 368 | arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 369 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 370 | /* Who has more than one independent system counter? */ |
| 371 | if (arch_timer_rate) |
| 372 | return; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 373 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 374 | /* Try to determine the frequency from the device tree or CNTFRQ */ |
| 375 | if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { |
| 376 | if (cntbase) |
| 377 | arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); |
| 378 | else |
| 379 | arch_timer_rate = arch_timer_get_cntfrq(); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 380 | } |
| 381 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 382 | /* Check the timer frequency. */ |
| 383 | if (arch_timer_rate == 0) |
| 384 | pr_warn("Architected timer frequency not available\n"); |
| 385 | } |
| 386 | |
| 387 | static void arch_timer_banner(unsigned type) |
| 388 | { |
| 389 | pr_info("Architected %s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", |
| 390 | type & ARCH_CP15_TIMER ? "cp15" : "", |
| 391 | type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", |
| 392 | type & ARCH_MEM_TIMER ? "mmio" : "", |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 393 | (unsigned long)arch_timer_rate / 1000000, |
| 394 | (unsigned long)(arch_timer_rate / 10000) % 100, |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 395 | type & ARCH_CP15_TIMER ? |
| 396 | arch_timer_use_virtual ? "virt" : "phys" : |
| 397 | "", |
| 398 | type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", |
| 399 | type & ARCH_MEM_TIMER ? |
| 400 | arch_timer_mem_use_virtual ? "virt" : "phys" : |
| 401 | ""); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | u32 arch_timer_get_rate(void) |
| 405 | { |
| 406 | return arch_timer_rate; |
| 407 | } |
| 408 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 409 | static u64 arch_counter_get_cntvct_mem(void) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 410 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 411 | u32 vct_lo, vct_hi, tmp_hi; |
| 412 | |
| 413 | do { |
| 414 | vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); |
| 415 | vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); |
| 416 | tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); |
| 417 | } while (vct_hi != tmp_hi); |
| 418 | |
| 419 | return ((u64) vct_hi << 32) | vct_lo; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 420 | } |
| 421 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 422 | /* |
| 423 | * Default to cp15 based access because arm64 uses this function for |
| 424 | * sched_clock() before DT is probed and the cp15 method is guaranteed |
| 425 | * to exist on arm64. arm doesn't use this before DT is probed so even |
| 426 | * if we don't have the cp15 accessors we won't have a problem. |
| 427 | */ |
| 428 | u64 (*arch_timer_read_counter)(void) = arch_counter_get_cntvct; |
| 429 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 430 | static cycle_t arch_counter_read(struct clocksource *cs) |
| 431 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 432 | return arch_timer_read_counter(); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | static cycle_t arch_counter_read_cc(const struct cyclecounter *cc) |
| 436 | { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 437 | return arch_timer_read_counter(); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | static struct clocksource clocksource_counter = { |
| 441 | .name = "arch_sys_counter", |
| 442 | .rating = 400, |
| 443 | .read = arch_counter_read, |
| 444 | .mask = CLOCKSOURCE_MASK(56), |
Stephen Boyd | 4fbcdc8 | 2013-09-27 13:13:12 -0700 | [diff] [blame] | 445 | .flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP, |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 446 | }; |
| 447 | |
| 448 | static struct cyclecounter cyclecounter = { |
| 449 | .read = arch_counter_read_cc, |
| 450 | .mask = CLOCKSOURCE_MASK(56), |
| 451 | }; |
| 452 | |
| 453 | static struct timecounter timecounter; |
| 454 | |
| 455 | struct timecounter *arch_timer_get_timecounter(void) |
| 456 | { |
| 457 | return &timecounter; |
| 458 | } |
| 459 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 460 | static void __init arch_counter_register(unsigned type) |
| 461 | { |
| 462 | u64 start_count; |
| 463 | |
| 464 | /* Register the CP15 based counter if we have one */ |
Nathan Lynch | 423bd69 | 2014-09-29 01:50:06 +0200 | [diff] [blame] | 465 | if (type & ARCH_CP15_TIMER) { |
Catalin Marinas | d6ad369 | 2014-12-10 11:02:09 +0000 | [diff] [blame] | 466 | if (IS_ENABLED(CONFIG_ARM64) || arch_timer_use_virtual) |
Sonny Rao | 0b46b8a | 2014-11-23 23:02:44 -0800 | [diff] [blame] | 467 | arch_timer_read_counter = arch_counter_get_cntvct; |
| 468 | else |
| 469 | arch_timer_read_counter = arch_counter_get_cntpct; |
Nathan Lynch | 423bd69 | 2014-09-29 01:50:06 +0200 | [diff] [blame] | 470 | } else { |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 471 | arch_timer_read_counter = arch_counter_get_cntvct_mem; |
| 472 | |
Nathan Lynch | 423bd69 | 2014-09-29 01:50:06 +0200 | [diff] [blame] | 473 | /* If the clocksource name is "arch_sys_counter" the |
| 474 | * VDSO will attempt to read the CP15-based counter. |
| 475 | * Ensure this does not happen when CP15-based |
| 476 | * counter is not available. |
| 477 | */ |
| 478 | clocksource_counter.name = "arch_mem_counter"; |
| 479 | } |
| 480 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 481 | start_count = arch_timer_read_counter(); |
| 482 | clocksource_register_hz(&clocksource_counter, arch_timer_rate); |
| 483 | cyclecounter.mult = clocksource_counter.mult; |
| 484 | cyclecounter.shift = clocksource_counter.shift; |
| 485 | timecounter_init(&timecounter, &cyclecounter, start_count); |
Thierry Reding | 4a7d3e8 | 2013-10-15 15:31:51 +0200 | [diff] [blame] | 486 | |
| 487 | /* 56 bits minimum, so we assume worst case rollover */ |
| 488 | sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 489 | } |
| 490 | |
Paul Gortmaker | 8c37bb3 | 2013-06-19 11:32:08 -0400 | [diff] [blame] | 491 | static void arch_timer_stop(struct clock_event_device *clk) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 492 | { |
| 493 | pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n", |
| 494 | clk->irq, smp_processor_id()); |
| 495 | |
| 496 | if (arch_timer_use_virtual) |
| 497 | disable_percpu_irq(arch_timer_ppi[VIRT_PPI]); |
| 498 | else { |
| 499 | disable_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI]); |
| 500 | if (arch_timer_ppi[PHYS_NONSECURE_PPI]) |
| 501 | disable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI]); |
| 502 | } |
| 503 | |
| 504 | clk->set_mode(CLOCK_EVT_MODE_UNUSED, clk); |
| 505 | } |
| 506 | |
Paul Gortmaker | 8c37bb3 | 2013-06-19 11:32:08 -0400 | [diff] [blame] | 507 | static int arch_timer_cpu_notify(struct notifier_block *self, |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 508 | unsigned long action, void *hcpu) |
| 509 | { |
Stephen Boyd | f31c2f1 | 2013-04-17 16:26:18 -0700 | [diff] [blame] | 510 | /* |
| 511 | * Grab cpu pointer in each case to avoid spurious |
| 512 | * preemptible warnings |
| 513 | */ |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 514 | switch (action & ~CPU_TASKS_FROZEN) { |
| 515 | case CPU_STARTING: |
Stephen Boyd | f31c2f1 | 2013-04-17 16:26:18 -0700 | [diff] [blame] | 516 | arch_timer_setup(this_cpu_ptr(arch_timer_evt)); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 517 | break; |
| 518 | case CPU_DYING: |
Stephen Boyd | f31c2f1 | 2013-04-17 16:26:18 -0700 | [diff] [blame] | 519 | arch_timer_stop(this_cpu_ptr(arch_timer_evt)); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 520 | break; |
| 521 | } |
| 522 | |
| 523 | return NOTIFY_OK; |
| 524 | } |
| 525 | |
Paul Gortmaker | 8c37bb3 | 2013-06-19 11:32:08 -0400 | [diff] [blame] | 526 | static struct notifier_block arch_timer_cpu_nb = { |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 527 | .notifier_call = arch_timer_cpu_notify, |
| 528 | }; |
| 529 | |
Sudeep KarkadaNagesha | 346e748 | 2013-08-23 15:53:15 +0100 | [diff] [blame] | 530 | #ifdef CONFIG_CPU_PM |
| 531 | static unsigned int saved_cntkctl; |
| 532 | static int arch_timer_cpu_pm_notify(struct notifier_block *self, |
| 533 | unsigned long action, void *hcpu) |
| 534 | { |
| 535 | if (action == CPU_PM_ENTER) |
| 536 | saved_cntkctl = arch_timer_get_cntkctl(); |
| 537 | else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT) |
| 538 | arch_timer_set_cntkctl(saved_cntkctl); |
| 539 | return NOTIFY_OK; |
| 540 | } |
| 541 | |
| 542 | static struct notifier_block arch_timer_cpu_pm_notifier = { |
| 543 | .notifier_call = arch_timer_cpu_pm_notify, |
| 544 | }; |
| 545 | |
| 546 | static int __init arch_timer_cpu_pm_init(void) |
| 547 | { |
| 548 | return cpu_pm_register_notifier(&arch_timer_cpu_pm_notifier); |
| 549 | } |
| 550 | #else |
| 551 | static int __init arch_timer_cpu_pm_init(void) |
| 552 | { |
| 553 | return 0; |
| 554 | } |
| 555 | #endif |
| 556 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 557 | static int __init arch_timer_register(void) |
| 558 | { |
| 559 | int err; |
| 560 | int ppi; |
| 561 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 562 | arch_timer_evt = alloc_percpu(struct clock_event_device); |
| 563 | if (!arch_timer_evt) { |
| 564 | err = -ENOMEM; |
| 565 | goto out; |
| 566 | } |
| 567 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 568 | if (arch_timer_use_virtual) { |
| 569 | ppi = arch_timer_ppi[VIRT_PPI]; |
| 570 | err = request_percpu_irq(ppi, arch_timer_handler_virt, |
| 571 | "arch_timer", arch_timer_evt); |
| 572 | } else { |
| 573 | ppi = arch_timer_ppi[PHYS_SECURE_PPI]; |
| 574 | err = request_percpu_irq(ppi, arch_timer_handler_phys, |
| 575 | "arch_timer", arch_timer_evt); |
| 576 | if (!err && arch_timer_ppi[PHYS_NONSECURE_PPI]) { |
| 577 | ppi = arch_timer_ppi[PHYS_NONSECURE_PPI]; |
| 578 | err = request_percpu_irq(ppi, arch_timer_handler_phys, |
| 579 | "arch_timer", arch_timer_evt); |
| 580 | if (err) |
| 581 | free_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI], |
| 582 | arch_timer_evt); |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | if (err) { |
| 587 | pr_err("arch_timer: can't register interrupt %d (%d)\n", |
| 588 | ppi, err); |
| 589 | goto out_free; |
| 590 | } |
| 591 | |
| 592 | err = register_cpu_notifier(&arch_timer_cpu_nb); |
| 593 | if (err) |
| 594 | goto out_free_irq; |
| 595 | |
Sudeep KarkadaNagesha | 346e748 | 2013-08-23 15:53:15 +0100 | [diff] [blame] | 596 | err = arch_timer_cpu_pm_init(); |
| 597 | if (err) |
| 598 | goto out_unreg_notify; |
| 599 | |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 600 | /* Immediately configure the timer on the boot CPU */ |
| 601 | arch_timer_setup(this_cpu_ptr(arch_timer_evt)); |
| 602 | |
| 603 | return 0; |
| 604 | |
Sudeep KarkadaNagesha | 346e748 | 2013-08-23 15:53:15 +0100 | [diff] [blame] | 605 | out_unreg_notify: |
| 606 | unregister_cpu_notifier(&arch_timer_cpu_nb); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 607 | out_free_irq: |
| 608 | if (arch_timer_use_virtual) |
| 609 | free_percpu_irq(arch_timer_ppi[VIRT_PPI], arch_timer_evt); |
| 610 | else { |
| 611 | free_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI], |
| 612 | arch_timer_evt); |
| 613 | if (arch_timer_ppi[PHYS_NONSECURE_PPI]) |
| 614 | free_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], |
| 615 | arch_timer_evt); |
| 616 | } |
| 617 | |
| 618 | out_free: |
| 619 | free_percpu(arch_timer_evt); |
| 620 | out: |
| 621 | return err; |
| 622 | } |
| 623 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 624 | static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq) |
| 625 | { |
| 626 | int ret; |
| 627 | irq_handler_t func; |
| 628 | struct arch_timer *t; |
| 629 | |
| 630 | t = kzalloc(sizeof(*t), GFP_KERNEL); |
| 631 | if (!t) |
| 632 | return -ENOMEM; |
| 633 | |
| 634 | t->base = base; |
| 635 | t->evt.irq = irq; |
| 636 | __arch_timer_setup(ARCH_MEM_TIMER, &t->evt); |
| 637 | |
| 638 | if (arch_timer_mem_use_virtual) |
| 639 | func = arch_timer_handler_virt_mem; |
| 640 | else |
| 641 | func = arch_timer_handler_phys_mem; |
| 642 | |
| 643 | ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &t->evt); |
| 644 | if (ret) { |
| 645 | pr_err("arch_timer: Failed to request mem timer irq\n"); |
| 646 | kfree(t); |
| 647 | } |
| 648 | |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | static const struct of_device_id arch_timer_of_match[] __initconst = { |
| 653 | { .compatible = "arm,armv7-timer", }, |
| 654 | { .compatible = "arm,armv8-timer", }, |
| 655 | {}, |
| 656 | }; |
| 657 | |
| 658 | static const struct of_device_id arch_timer_mem_of_match[] __initconst = { |
| 659 | { .compatible = "arm,armv7-timer-mem", }, |
| 660 | {}, |
| 661 | }; |
| 662 | |
Sudeep Holla | c387f07 | 2014-09-29 01:50:05 +0200 | [diff] [blame] | 663 | static bool __init |
| 664 | arch_timer_probed(int type, const struct of_device_id *matches) |
| 665 | { |
| 666 | struct device_node *dn; |
Marc Zyngier | 59aa896 | 2014-10-15 16:06:20 +0100 | [diff] [blame] | 667 | bool probed = true; |
Sudeep Holla | c387f07 | 2014-09-29 01:50:05 +0200 | [diff] [blame] | 668 | |
| 669 | dn = of_find_matching_node(NULL, matches); |
Marc Zyngier | 59aa896 | 2014-10-15 16:06:20 +0100 | [diff] [blame] | 670 | if (dn && of_device_is_available(dn) && !(arch_timers_present & type)) |
| 671 | probed = false; |
Sudeep Holla | c387f07 | 2014-09-29 01:50:05 +0200 | [diff] [blame] | 672 | of_node_put(dn); |
| 673 | |
| 674 | return probed; |
| 675 | } |
| 676 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 677 | static void __init arch_timer_common_init(void) |
| 678 | { |
| 679 | unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER; |
| 680 | |
| 681 | /* Wait until both nodes are probed if we have two timers */ |
| 682 | if ((arch_timers_present & mask) != mask) { |
Sudeep Holla | c387f07 | 2014-09-29 01:50:05 +0200 | [diff] [blame] | 683 | if (!arch_timer_probed(ARCH_MEM_TIMER, arch_timer_mem_of_match)) |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 684 | return; |
Sudeep Holla | c387f07 | 2014-09-29 01:50:05 +0200 | [diff] [blame] | 685 | if (!arch_timer_probed(ARCH_CP15_TIMER, arch_timer_of_match)) |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 686 | return; |
| 687 | } |
| 688 | |
| 689 | arch_timer_banner(arch_timers_present); |
| 690 | arch_counter_register(arch_timers_present); |
| 691 | arch_timer_arch_init(); |
| 692 | } |
| 693 | |
Rob Herring | 0583fe4 | 2013-04-10 18:27:51 -0500 | [diff] [blame] | 694 | static void __init arch_timer_init(struct device_node *np) |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 695 | { |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 696 | int i; |
| 697 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 698 | if (arch_timers_present & ARCH_CP15_TIMER) { |
Rob Herring | 0583fe4 | 2013-04-10 18:27:51 -0500 | [diff] [blame] | 699 | pr_warn("arch_timer: multiple nodes in dt, skipping\n"); |
| 700 | return; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 701 | } |
| 702 | |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 703 | arch_timers_present |= ARCH_CP15_TIMER; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 704 | for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) |
| 705 | arch_timer_ppi[i] = irq_of_parse_and_map(np, i); |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 706 | arch_timer_detect_rate(NULL, np); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 707 | |
| 708 | /* |
Doug Anderson | 65b5732 | 2014-10-08 00:33:47 -0700 | [diff] [blame] | 709 | * If we cannot rely on firmware initializing the timer registers then |
| 710 | * we should use the physical timers instead. |
| 711 | */ |
| 712 | if (IS_ENABLED(CONFIG_ARM) && |
| 713 | of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) |
| 714 | arch_timer_use_virtual = false; |
| 715 | |
| 716 | /* |
Marc Zyngier | 8266891 | 2013-01-10 11:13:07 +0000 | [diff] [blame] | 717 | * If HYP mode is available, we know that the physical timer |
| 718 | * has been configured to be accessible from PL1. Use it, so |
| 719 | * that a guest can use the virtual timer instead. |
| 720 | * |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 721 | * If no interrupt provided for virtual timer, we'll have to |
| 722 | * stick to the physical timer. It'd better be accessible... |
| 723 | */ |
Marc Zyngier | 8266891 | 2013-01-10 11:13:07 +0000 | [diff] [blame] | 724 | if (is_hyp_mode_available() || !arch_timer_ppi[VIRT_PPI]) { |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 725 | arch_timer_use_virtual = false; |
| 726 | |
| 727 | if (!arch_timer_ppi[PHYS_SECURE_PPI] || |
| 728 | !arch_timer_ppi[PHYS_NONSECURE_PPI]) { |
| 729 | pr_warn("arch_timer: No interrupt available, giving up\n"); |
Rob Herring | 0583fe4 | 2013-04-10 18:27:51 -0500 | [diff] [blame] | 730 | return; |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 731 | } |
| 732 | } |
| 733 | |
Lorenzo Pieralisi | 82a56194 | 2014-04-08 10:04:32 +0100 | [diff] [blame] | 734 | arch_timer_c3stop = !of_property_read_bool(np, "always-on"); |
| 735 | |
Rob Herring | 0583fe4 | 2013-04-10 18:27:51 -0500 | [diff] [blame] | 736 | arch_timer_register(); |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 737 | arch_timer_common_init(); |
Mark Rutland | 8a4da6e | 2012-11-12 14:33:44 +0000 | [diff] [blame] | 738 | } |
Rob Herring | 0583fe4 | 2013-04-10 18:27:51 -0500 | [diff] [blame] | 739 | CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init); |
| 740 | CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init); |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 741 | |
| 742 | static void __init arch_timer_mem_init(struct device_node *np) |
| 743 | { |
| 744 | struct device_node *frame, *best_frame = NULL; |
| 745 | void __iomem *cntctlbase, *base; |
| 746 | unsigned int irq; |
| 747 | u32 cnttidr; |
| 748 | |
| 749 | arch_timers_present |= ARCH_MEM_TIMER; |
| 750 | cntctlbase = of_iomap(np, 0); |
| 751 | if (!cntctlbase) { |
| 752 | pr_err("arch_timer: Can't find CNTCTLBase\n"); |
| 753 | return; |
| 754 | } |
| 755 | |
| 756 | cnttidr = readl_relaxed(cntctlbase + CNTTIDR); |
| 757 | iounmap(cntctlbase); |
| 758 | |
| 759 | /* |
| 760 | * Try to find a virtual capable frame. Otherwise fall back to a |
| 761 | * physical capable frame. |
| 762 | */ |
| 763 | for_each_available_child_of_node(np, frame) { |
| 764 | int n; |
| 765 | |
| 766 | if (of_property_read_u32(frame, "frame-number", &n)) { |
| 767 | pr_err("arch_timer: Missing frame-number\n"); |
| 768 | of_node_put(best_frame); |
| 769 | of_node_put(frame); |
| 770 | return; |
| 771 | } |
| 772 | |
| 773 | if (cnttidr & CNTTIDR_VIRT(n)) { |
| 774 | of_node_put(best_frame); |
| 775 | best_frame = frame; |
| 776 | arch_timer_mem_use_virtual = true; |
| 777 | break; |
| 778 | } |
| 779 | of_node_put(best_frame); |
| 780 | best_frame = of_node_get(frame); |
| 781 | } |
| 782 | |
| 783 | base = arch_counter_base = of_iomap(best_frame, 0); |
| 784 | if (!base) { |
| 785 | pr_err("arch_timer: Can't map frame's registers\n"); |
| 786 | of_node_put(best_frame); |
| 787 | return; |
| 788 | } |
| 789 | |
| 790 | if (arch_timer_mem_use_virtual) |
| 791 | irq = irq_of_parse_and_map(best_frame, 1); |
| 792 | else |
| 793 | irq = irq_of_parse_and_map(best_frame, 0); |
| 794 | of_node_put(best_frame); |
| 795 | if (!irq) { |
| 796 | pr_err("arch_timer: Frame missing %s irq", |
Thomas Gleixner | cfb6d65 | 2013-08-21 14:59:23 +0200 | [diff] [blame] | 797 | arch_timer_mem_use_virtual ? "virt" : "phys"); |
Stephen Boyd | 2200699 | 2013-07-18 16:59:32 -0700 | [diff] [blame] | 798 | return; |
| 799 | } |
| 800 | |
| 801 | arch_timer_detect_rate(base, np); |
| 802 | arch_timer_mem_register(base, irq); |
| 803 | arch_timer_common_init(); |
| 804 | } |
| 805 | CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", |
| 806 | arch_timer_mem_init); |