projects / thirdparty / kernel / stable.git / blame
| Commit | Line | Data |
|---|---|---|
| 12bb3440 SG |
1 | /* |
| 2 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
| 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 | ||
| 9 | #include <linux/cpuidle.h> | |
| 10 | #include <linux/module.h> | |
| 11 | #include <asm/cpuidle.h> | |
| 12 | ||
| 47096103 BD |
13 | #include <soc/imx/cpuidle.h> |
| 14 | ||
| e5f9dec8 | 15 | #include "common.h" |
| 12bb3440 | 16 | #include "cpuidle.h" |
| a25d67a4 | 17 | #include "hardware.h" |
| 12bb3440 | 18 | |
| ace6b822 KO |
19 | static int num_idle_cpus = 0; |
| 20 | static DEFINE_SPINLOCK(cpuidle_lock); | |
| e5f9dec8 SG |
21 | |
| 22 | static int imx6q_enter_wait(struct cpuidle_device *dev, | |
| 23 | struct cpuidle_driver *drv, int index) | |
| 24 | { | |
| ace6b822 KO |
25 | spin_lock(&cpuidle_lock); |
| 26 | if (++num_idle_cpus == num_online_cpus()) | |
| 8fb76a07 | 27 | imx6_set_lpm(WAIT_UNCLOCKED); |
| ace6b822 | 28 | spin_unlock(&cpuidle_lock); |
| e5f9dec8 | 29 | |
| e5f9dec8 | 30 | cpu_do_idle(); |
| ace6b822 KO |
31 | |
| 32 | spin_lock(&cpuidle_lock); | |
| 33 | if (num_idle_cpus-- == num_online_cpus()) | |
| 34 | imx6_set_lpm(WAIT_CLOCKED); | |
| 35 | spin_unlock(&cpuidle_lock); | |
| e5f9dec8 SG |
36 | |
| 37 | return index; | |
| 38 | } | |
| 39 | ||
| 12bb3440 SG |
40 | static struct cpuidle_driver imx6q_cpuidle_driver = { |
| 41 | .name = "imx6q_cpuidle", | |
| 42 | .owner = THIS_MODULE, | |
| e5f9dec8 SG |
43 | .states = { |
| 44 | /* WFI */ | |
| 45 | ARM_CPUIDLE_WFI_STATE, | |
| 46 | /* WAIT */ | |
| 47 | { | |
| 48 | .exit_latency = 50, | |
| 49 | .target_residency = 75, | |
| b82b6cca | 50 | .flags = CPUIDLE_FLAG_TIMER_STOP, |
| e5f9dec8 SG |
51 | .enter = imx6q_enter_wait, |
| 52 | .name = "WAIT", | |
| 53 | .desc = "Clock off", | |
| 54 | }, | |
| 55 | }, | |
| 56 | .state_count = 2, | |
| 57 | .safe_state_index = 0, | |
| 12bb3440 SG |
58 | }; |
| 59 | ||
| 29380905 LS |
60 | /* |
| 61 | * i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the | |
| 62 | * CPUs when they are in wait(unclocked) state. As the hardware workaround isn't | |
| 63 | * applicable to all boards, disable the deeper idle state when the workaround | |
| 64 | * isn't present and the FEC is in use. | |
| 65 | */ | |
| 66 | void imx6q_cpuidle_fec_irqs_used(void) | |
| 67 | { | |
| 68 | imx6q_cpuidle_driver.states[1].disabled = true; | |
| 69 | } | |
| 2cb9caa4 | 70 | EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used); |
| 29380905 LS |
71 | |
| 72 | void imx6q_cpuidle_fec_irqs_unused(void) | |
| 73 | { | |
| 74 | imx6q_cpuidle_driver.states[1].disabled = false; | |
| 75 | } | |
| 2cb9caa4 | 76 | EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused); |
| 29380905 | 77 | |
| 12bb3440 SG |
78 | int __init imx6q_cpuidle_init(void) |
| 79 | { | |
| fa6be65e | 80 | /* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */ |
| 8765caa5 | 81 | imx6_set_int_mem_clk_lpm(true); |
| e5f9dec8 | 82 | |
| 54a4644b | 83 | return cpuidle_register(&imx6q_cpuidle_driver, NULL); |
| 12bb3440 | 84 | } |