| Gregory CLEMENT | b858fbc | 2014-04-14 17:10:13 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Marvell Armada 370 and Armada XP SoC cpuidle driver |
| 3 | * |
| 4 | * Copyright (C) 2014 Marvell |
| 5 | * |
| 6 | * Nadav Haklai <nadavh@marvell.com> |
| 7 | * Gregory CLEMENT <gregory.clement@free-electrons.com> |
| 8 | * |
| 9 | * This file is licensed under the terms of the GNU General Public |
| 10 | * License version 2. This program is licensed "as is" without any |
| 11 | * warranty of any kind, whether express or implied. |
| 12 | * |
| 13 | * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com> |
| 14 | */ |
| 15 | |
| 16 | #include <linux/cpu_pm.h> |
| 17 | #include <linux/cpuidle.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/of.h> |
| 20 | #include <linux/suspend.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <asm/cpuidle.h> |
| 23 | |
| 24 | #define ARMADA_370_XP_MAX_STATES 3 |
| 25 | #define ARMADA_370_XP_FLAG_DEEP_IDLE 0x10000 |
| 26 | |
| 27 | static int (*armada_370_xp_cpu_suspend)(int); |
| 28 | |
| 29 | static int armada_370_xp_enter_idle(struct cpuidle_device *dev, |
| 30 | struct cpuidle_driver *drv, |
| 31 | int index) |
| 32 | { |
| 33 | int ret; |
| 34 | bool deepidle = false; |
| 35 | cpu_pm_enter(); |
| 36 | |
| 37 | if (drv->states[index].flags & ARMADA_370_XP_FLAG_DEEP_IDLE) |
| 38 | deepidle = true; |
| 39 | |
| 40 | ret = armada_370_xp_cpu_suspend(deepidle); |
| 41 | if (ret) |
| 42 | return ret; |
| 43 | |
| 44 | cpu_pm_exit(); |
| 45 | |
| 46 | return index; |
| 47 | } |
| 48 | |
| 49 | static struct cpuidle_driver armada_370_xp_idle_driver = { |
| 50 | .name = "armada_370_xp_idle", |
| 51 | .states[0] = ARM_CPUIDLE_WFI_STATE, |
| 52 | .states[1] = { |
| 53 | .enter = armada_370_xp_enter_idle, |
| 54 | .exit_latency = 10, |
| 55 | .power_usage = 50, |
| 56 | .target_residency = 100, |
| 57 | .flags = CPUIDLE_FLAG_TIME_VALID, |
| 58 | .name = "MV CPU IDLE", |
| 59 | .desc = "CPU power down", |
| 60 | }, |
| 61 | .states[2] = { |
| 62 | .enter = armada_370_xp_enter_idle, |
| 63 | .exit_latency = 100, |
| 64 | .power_usage = 5, |
| 65 | .target_residency = 1000, |
| 66 | .flags = CPUIDLE_FLAG_TIME_VALID | |
| 67 | ARMADA_370_XP_FLAG_DEEP_IDLE, |
| 68 | .name = "MV CPU DEEP IDLE", |
| 69 | .desc = "CPU and L2 Fabric power down", |
| 70 | }, |
| 71 | .state_count = ARMADA_370_XP_MAX_STATES, |
| 72 | }; |
| 73 | |
| 74 | static int armada_370_xp_cpuidle_probe(struct platform_device *pdev) |
| 75 | { |
| 76 | |
| 77 | armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data); |
| 78 | return cpuidle_register(&armada_370_xp_idle_driver, NULL); |
| 79 | } |
| 80 | |
| 81 | static struct platform_driver armada_370_xp_cpuidle_plat_driver = { |
| 82 | .driver = { |
| 83 | .name = "cpuidle-armada-370-xp", |
| 84 | .owner = THIS_MODULE, |
| 85 | }, |
| 86 | .probe = armada_370_xp_cpuidle_probe, |
| 87 | }; |
| 88 | |
| 89 | module_platform_driver(armada_370_xp_cpuidle_plat_driver); |
| 90 | |
| 91 | MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>"); |
| 92 | MODULE_DESCRIPTION("Armada 370/XP cpu idle driver"); |
| 93 | MODULE_LICENSE("GPL"); |