| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 Calxeda, Inc. |
| 3 | * |
| 4 | * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7 |
| 5 | * Copyright 2012 Freescale Semiconductor, Inc. |
| 6 | * Copyright 2012 Linaro Ltd. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms and conditions of the GNU General Public License, |
| 10 | * version 2, as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along with |
| 18 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | * Maintainer: Rob Herring <rob.herring@calxeda.com> |
| 21 | */ |
| 22 | |
| 23 | #include <linux/cpuidle.h> |
| 24 | #include <linux/cpu_pm.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/psci.h> |
| 29 | |
| 30 | #include <asm/cpuidle.h> |
| 31 | #include <asm/suspend.h> |
| 32 | |
| 33 | #include <uapi/linux/psci.h> |
| 34 | |
| 35 | #define CALXEDA_IDLE_PARAM \ |
| 36 | ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \ |
| 37 | (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \ |
| 38 | (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT)) |
| 39 | |
| 40 | static int calxeda_idle_finish(unsigned long val) |
| 41 | { |
| 42 | return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume)); |
| 43 | } |
| 44 | |
| 45 | static int calxeda_pwrdown_idle(struct cpuidle_device *dev, |
| 46 | struct cpuidle_driver *drv, |
| 47 | int index) |
| 48 | { |
| 49 | cpu_pm_enter(); |
| 50 | cpu_suspend(0, calxeda_idle_finish); |
| 51 | cpu_pm_exit(); |
| 52 | |
| 53 | return index; |
| 54 | } |
| 55 | |
| 56 | static struct cpuidle_driver calxeda_idle_driver = { |
| 57 | .name = "calxeda_idle", |
| 58 | .states = { |
| 59 | ARM_CPUIDLE_WFI_STATE, |
| 60 | { |
| 61 | .name = "PG", |
| 62 | .desc = "Power Gate", |
| 63 | .exit_latency = 30, |
| 64 | .power_usage = 50, |
| 65 | .target_residency = 200, |
| 66 | .enter = calxeda_pwrdown_idle, |
| 67 | }, |
| 68 | }, |
| 69 | .state_count = 2, |
| 70 | }; |
| 71 | |
| 72 | static int calxeda_cpuidle_probe(struct platform_device *pdev) |
| 73 | { |
| 74 | return cpuidle_register(&calxeda_idle_driver, NULL); |
| 75 | } |
| 76 | |
| 77 | static struct platform_driver calxeda_cpuidle_plat_driver = { |
| 78 | .driver = { |
| 79 | .name = "cpuidle-calxeda", |
| 80 | }, |
| 81 | .probe = calxeda_cpuidle_probe, |
| 82 | }; |
| 83 | builtin_platform_driver(calxeda_cpuidle_plat_driver); |