| /* |
| * i.MX27 Power Management Routines |
| * |
| * Based on Freescale's BSP |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/suspend.h> |
| #include <linux/io.h> |
| |
| #include "hardware.h" |
| |
| static int mx27_suspend_enter(suspend_state_t state) |
| { |
| u32 cscr; |
| switch (state) { |
| case PM_SUSPEND_MEM: |
| /* Clear MPEN and SPEN to disable MPLL/SPLL */ |
| cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); |
| cscr &= 0xFFFFFFFC; |
| imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); |
| /* Executes WFI */ |
| cpu_do_idle(); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static const struct platform_suspend_ops mx27_suspend_ops = { |
| .enter = mx27_suspend_enter, |
| .valid = suspend_valid_only_mem, |
| }; |
| |
| void __init imx27_pm_init(void) |
| { |
| suspend_set_ops(&mx27_suspend_ops); |
| } |