Kukjin Kim | 7d30e8b | 2011-02-14 16:33:10 +0900 | [diff] [blame] | 1 | /* linux arch/arm/mach-exynos4/hotplug.c |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 2 | * |
| 3 | * Cloned from linux/arch/arm/mach-realview/hotplug.c |
| 4 | * |
| 5 | * Copyright (C) 2002 ARM Ltd. |
| 6 | * All Rights Reserved |
| 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/kernel.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/smp.h> |
JungHi Min | 911c29b | 2011-07-16 13:39:09 +0900 | [diff] [blame] | 16 | #include <linux/io.h> |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 17 | |
| 18 | #include <asm/cacheflush.h> |
Russell King | 15d07dc | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 19 | #include <asm/cp15.h> |
Will Deacon | eb50439 | 2012-01-20 12:01:12 +0100 | [diff] [blame] | 20 | #include <asm/smp_plat.h> |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 21 | |
JungHi Min | 911c29b | 2011-07-16 13:39:09 +0900 | [diff] [blame] | 22 | #include <mach/regs-pmu.h> |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 23 | #include <plat/cpu.h> |
JungHi Min | 911c29b | 2011-07-16 13:39:09 +0900 | [diff] [blame] | 24 | |
Marc Zyngier | 06853ae | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 25 | #include "common.h" |
| 26 | |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 27 | static inline void cpu_enter_lowpower_a9(void) |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 28 | { |
| 29 | unsigned int v; |
| 30 | |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 31 | asm volatile( |
| 32 | " mcr p15, 0, %1, c7, c5, 0\n" |
| 33 | " mcr p15, 0, %1, c7, c10, 4\n" |
| 34 | /* |
| 35 | * Turn off coherency |
| 36 | */ |
| 37 | " mrc p15, 0, %0, c1, c0, 1\n" |
Kukjin Kim | ad849a2 | 2011-02-28 20:35:33 +0900 | [diff] [blame] | 38 | " bic %0, %0, %3\n" |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 39 | " mcr p15, 0, %0, c1, c0, 1\n" |
| 40 | " mrc p15, 0, %0, c1, c0, 0\n" |
Russell King | 30b99d0 | 2011-01-14 12:06:26 +0000 | [diff] [blame] | 41 | " bic %0, %0, %2\n" |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 42 | " mcr p15, 0, %0, c1, c0, 0\n" |
| 43 | : "=&r" (v) |
Kukjin Kim | ad849a2 | 2011-02-28 20:35:33 +0900 | [diff] [blame] | 44 | : "r" (0), "Ir" (CR_C), "Ir" (0x40) |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 45 | : "cc"); |
| 46 | } |
| 47 | |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 48 | static inline void cpu_enter_lowpower_a15(void) |
| 49 | { |
| 50 | unsigned int v; |
| 51 | |
| 52 | asm volatile( |
| 53 | " mrc p15, 0, %0, c1, c0, 0\n" |
| 54 | " bic %0, %0, %1\n" |
| 55 | " mcr p15, 0, %0, c1, c0, 0\n" |
| 56 | : "=&r" (v) |
| 57 | : "Ir" (CR_C) |
| 58 | : "cc"); |
| 59 | |
| 60 | flush_cache_louis(); |
| 61 | |
| 62 | asm volatile( |
| 63 | /* |
| 64 | * Turn off coherency |
| 65 | */ |
| 66 | " mrc p15, 0, %0, c1, c0, 1\n" |
| 67 | " bic %0, %0, %1\n" |
| 68 | " mcr p15, 0, %0, c1, c0, 1\n" |
| 69 | : "=&r" (v) |
| 70 | : "Ir" (0x40) |
| 71 | : "cc"); |
| 72 | |
| 73 | isb(); |
| 74 | dsb(); |
| 75 | } |
| 76 | |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 77 | static inline void cpu_leave_lowpower(void) |
| 78 | { |
| 79 | unsigned int v; |
| 80 | |
| 81 | asm volatile( |
| 82 | "mrc p15, 0, %0, c1, c0, 0\n" |
Russell King | e3d9c62 | 2010-12-19 11:36:33 +0000 | [diff] [blame] | 83 | " orr %0, %0, %1\n" |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 84 | " mcr p15, 0, %0, c1, c0, 0\n" |
| 85 | " mrc p15, 0, %0, c1, c0, 1\n" |
Kukjin Kim | ad849a2 | 2011-02-28 20:35:33 +0900 | [diff] [blame] | 86 | " orr %0, %0, %2\n" |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 87 | " mcr p15, 0, %0, c1, c0, 1\n" |
| 88 | : "=&r" (v) |
Kukjin Kim | ad849a2 | 2011-02-28 20:35:33 +0900 | [diff] [blame] | 89 | : "Ir" (CR_C), "Ir" (0x40) |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 90 | : "cc"); |
| 91 | } |
| 92 | |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 93 | static inline void platform_do_lowpower(unsigned int cpu, int *spurious) |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 94 | { |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 95 | for (;;) { |
JungHi Min | 911c29b | 2011-07-16 13:39:09 +0900 | [diff] [blame] | 96 | |
| 97 | /* make cpu1 to be turned off at next WFI command */ |
| 98 | if (cpu == 1) |
| 99 | __raw_writel(0, S5P_ARM_CORE1_CONFIGURATION); |
| 100 | |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 101 | /* |
| 102 | * here's the WFI |
| 103 | */ |
| 104 | asm(".word 0xe320f003\n" |
| 105 | : |
| 106 | : |
| 107 | : "memory", "cc"); |
| 108 | |
Will Deacon | 2f41c36 | 2011-08-09 11:29:19 +0100 | [diff] [blame] | 109 | if (pen_release == cpu_logical_map(cpu)) { |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 110 | /* |
| 111 | * OK, proper wakeup, we're done |
| 112 | */ |
| 113 | break; |
| 114 | } |
| 115 | |
| 116 | /* |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 117 | * Getting here, means that we have come out of WFI without |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 118 | * having been woken up - this shouldn't happen |
| 119 | * |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 120 | * Just note it happening - when we're woken, we can report |
| 121 | * its occurrence. |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 122 | */ |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 123 | (*spurious)++; |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 124 | } |
| 125 | } |
| 126 | |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 127 | /* |
| 128 | * platform-specific code to shutdown a CPU |
| 129 | * |
| 130 | * Called with IRQs disabled |
| 131 | */ |
Marc Zyngier | 06853ae | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 132 | void __ref exynos_cpu_die(unsigned int cpu) |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 133 | { |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 134 | int spurious = 0; |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 135 | int primary_part = 0; |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 136 | |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 137 | /* |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 138 | * we're ready for shutdown now, so do it. |
| 139 | * Exynos4 is A9 based while Exynos5 is A15; check the CPU part |
| 140 | * number by reading the Main ID register and then perform the |
| 141 | * appropriate sequence for entering low power. |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 142 | */ |
Abhilash Kesavan | 756e46d | 2012-11-22 14:46:17 +0900 | [diff] [blame] | 143 | asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc"); |
| 144 | if ((primary_part & 0xfff0) == 0xc0f0) |
| 145 | cpu_enter_lowpower_a15(); |
| 146 | else |
| 147 | cpu_enter_lowpower_a9(); |
| 148 | |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 149 | platform_do_lowpower(cpu, &spurious); |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 150 | |
| 151 | /* |
| 152 | * bring this CPU back into the world of cache |
| 153 | * coherency, and then restore interrupts |
| 154 | */ |
| 155 | cpu_leave_lowpower(); |
Russell King | d445026 | 2010-12-19 11:30:43 +0000 | [diff] [blame] | 156 | |
| 157 | if (spurious) |
| 158 | pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious); |
Changhwan Youn | 11adcc2 | 2010-08-20 18:17:51 +0900 | [diff] [blame] | 159 | } |