1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Copyright (c) 2011 Wolfson Microelectronics, plc |
4 | // Copyright (c) 2011 Samsung Electronics Co., Ltd. |
5 | // http://www.samsung.com |
6 | |
7 | #include <linux/kernel.h> |
8 | #include <linux/init.h> |
9 | #include <linux/cpuidle.h> |
10 | #include <linux/io.h> |
11 | #include <linux/export.h> |
12 | #include <linux/time.h> |
13 | |
14 | #include <asm/cpuidle.h> |
15 | |
16 | #include "cpu.h" |
17 | #include "map.h" |
18 | |
19 | #include "regs-sys-s3c64xx.h" |
20 | #include "regs-syscon-power-s3c64xx.h" |
21 | |
22 | static __cpuidle int s3c64xx_enter_idle(struct cpuidle_device *dev, |
23 | struct cpuidle_driver *drv, int index) |
24 | { |
25 | unsigned long tmp; |
26 | |
27 | /* Setup PWRCFG to enter idle mode */ |
28 | tmp = __raw_readl(S3C64XX_PWR_CFG); |
29 | tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK; |
30 | tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE; |
31 | __raw_writel(val: tmp, S3C64XX_PWR_CFG); |
32 | |
33 | cpu_do_idle(); |
34 | |
35 | return index; |
36 | } |
37 | |
38 | static struct cpuidle_driver s3c64xx_cpuidle_driver = { |
39 | .name = "s3c64xx_cpuidle" , |
40 | .owner = THIS_MODULE, |
41 | .states = { |
42 | { |
43 | .enter = s3c64xx_enter_idle, |
44 | .exit_latency = 1, |
45 | .target_residency = 1, |
46 | .name = "IDLE" , |
47 | .desc = "System active, ARM gated" , |
48 | }, |
49 | }, |
50 | .state_count = 1, |
51 | }; |
52 | |
53 | static int __init s3c64xx_init_cpuidle(void) |
54 | { |
55 | if (soc_is_s3c64xx()) |
56 | return cpuidle_register(drv: &s3c64xx_cpuidle_driver, NULL); |
57 | return 0; |
58 | } |
59 | device_initcall(s3c64xx_init_cpuidle); |
60 | |