projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e50b6bef RK |
1 | /* |
| 2 | * arch/arm/mach-kirkwood/cpuidle.c | |
| 3 | * | |
| 4 | * CPU idle Marvell Kirkwood SoCs | |
| 5 | * | |
| 6 | * This file is licensed under the terms of the GNU General Public | |
| 7 | * License version 2. This program is licensed "as is" without any | |
| 8 | * warranty of any kind, whether express or implied. | |
| 9 | * | |
| 10 | * The cpu idle uses wait-for-interrupt and DDR self refresh in order | |
| 11 | * to implement two idle states - | |
| 12 | * #1 wait-for-interrupt | |
| 13 | * #2 wait-for-interrupt and DDR self refresh | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/init.h> | |
| 18 | #include <linux/platform_device.h> | |
| 19 | #include <linux/cpuidle.h> | |
| 20 | #include <linux/io.h> | |
| dc28094b | 21 | #include <linux/export.h> |
| e50b6bef | 22 | #include <asm/proc-fns.h> |
| b334648d | 23 | #include <asm/cpuidle.h> |
| e50b6bef RK |
24 | #include <mach/kirkwood.h> |
| 25 | ||
| 26 | #define KIRKWOOD_MAX_STATES 2 | |
| 27 | ||
| e50b6bef RK |
28 | /* Actual code that puts the SoC in different idle states */ |
| 29 | static int kirkwood_enter_idle(struct cpuidle_device *dev, | |
| 46bcfad7 | 30 | struct cpuidle_driver *drv, |
| e978aa7d | 31 | int index) |
| e50b6bef | 32 | { |
| b334648d RL |
33 | writel(0x7, DDR_OPERATION_BASE); |
| 34 | cpu_do_idle(); | |
| e978aa7d DD |
35 | |
| 36 | return index; | |
| e50b6bef RK |
37 | } |
| 38 | ||
| b334648d RL |
39 | static struct cpuidle_driver kirkwood_idle_driver = { |
| 40 | .name = "kirkwood_idle", | |
| 41 | .owner = THIS_MODULE, | |
| 42 | .en_core_tk_irqen = 1, | |
| 43 | .states[0] = ARM_CPUIDLE_WFI_STATE, | |
| 44 | .states[1] = { | |
| 45 | .enter = kirkwood_enter_idle, | |
| 46 | .exit_latency = 10, | |
| 47 | .target_residency = 100000, | |
| 48 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
| 49 | .name = "DDR SR", | |
| 50 | .desc = "WFI and DDR Self Refresh", | |
| 51 | }, | |
| 52 | .state_count = KIRKWOOD_MAX_STATES, | |
| 53 | }; | |
| 54 | ||
| 55 | static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device); | |
| 56 | ||
| e50b6bef RK |
57 | /* Initialize CPU idle by registering the idle states */ |
| 58 | static int kirkwood_init_cpuidle(void) | |
| 59 | { | |
| 60 | struct cpuidle_device *device; | |
| e50b6bef RK |
61 | |
| 62 | device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id()); | |
| 63 | device->state_count = KIRKWOOD_MAX_STATES; | |
| e50b6bef | 64 | |
| 46bcfad7 | 65 | cpuidle_register_driver(&kirkwood_idle_driver); |
| e50b6bef | 66 | if (cpuidle_register_device(device)) { |
| 98adf932 | 67 | pr_err("kirkwood_init_cpuidle: Failed registering\n"); |
| e50b6bef RK |
68 | return -EIO; |
| 69 | } | |
| 70 | return 0; | |
| 71 | } | |
| 72 | ||
| 73 | device_initcall(kirkwood_init_cpuidle); |