| 1 | /* |
|---|---|
| 2 | * i.MX27 Power Management Routines |
| 3 | * |
| 4 | * Based on Freescale's BSP |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/of_address.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/suspend.h> |
| 13 | #include <linux/io.h> |
| 14 | |
| 15 | #include "common.h" |
| 16 | #include "hardware.h" |
| 17 | |
| 18 | static int mx27_suspend_enter(suspend_state_t state) |
| 19 | { |
| 20 | void __iomem *ccm_base; |
| 21 | struct device_node *np; |
| 22 | u32 cscr; |
| 23 | |
| 24 | np = of_find_compatible_node(NULL, NULL, compat: "fsl,imx27-ccm"); |
| 25 | ccm_base = of_iomap(node: np, index: 0); |
| 26 | BUG_ON(!ccm_base); |
| 27 | |
| 28 | switch (state) { |
| 29 | case PM_SUSPEND_MEM: |
| 30 | /* Clear MPEN and SPEN to disable MPLL/SPLL */ |
| 31 | cscr = imx_readl(ccm_base); |
| 32 | cscr &= 0xFFFFFFFC; |
| 33 | imx_writel(cscr, ccm_base); |
| 34 | /* Executes WFI */ |
| 35 | cpu_do_idle(); |
| 36 | break; |
| 37 | |
| 38 | default: |
| 39 | return -EINVAL; |
| 40 | } |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | static const struct platform_suspend_ops mx27_suspend_ops = { |
| 45 | .enter = mx27_suspend_enter, |
| 46 | .valid = suspend_valid_only_mem, |
| 47 | }; |
| 48 | |
| 49 | void __init imx27_pm_init(void) |
| 50 | { |
| 51 | suspend_set_ops(ops: &mx27_suspend_ops); |
| 52 | } |
| 53 |