diff options
Diffstat (limited to 'arch/arm/mach-s5p64x0/pm.c')
| -rw-r--r-- | arch/arm/mach-s5p64x0/pm.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/arch/arm/mach-s5p64x0/pm.c b/arch/arm/mach-s5p64x0/pm.c new file mode 100644 index 000000000000..69927243d25f --- /dev/null +++ b/arch/arm/mach-s5p64x0/pm.c @@ -0,0 +1,204 @@ +/* linux/arch/arm/mach-s5p64x0/pm.c + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * S5P64X0 Power Management Support + * + * Based on arch/arm/mach-s3c64xx/pm.c by Ben Dooks + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <linux/suspend.h> +#include <linux/syscore_ops.h> +#include <linux/io.h> + +#include <plat/cpu.h> +#include <plat/pm.h> +#include <plat/regs-timer.h> +#include <plat/wakeup-mask.h> + +#include <mach/regs-clock.h> +#include <mach/regs-gpio.h> + +static struct sleep_save s5p64x0_core_save[] = { + SAVE_ITEM(S5P64X0_APLL_CON), + SAVE_ITEM(S5P64X0_MPLL_CON), + SAVE_ITEM(S5P64X0_EPLL_CON), + SAVE_ITEM(S5P64X0_EPLL_CON_K), + SAVE_ITEM(S5P64X0_CLK_SRC0), + SAVE_ITEM(S5P64X0_CLK_SRC1), + SAVE_ITEM(S5P64X0_CLK_DIV0), + SAVE_ITEM(S5P64X0_CLK_DIV1), + SAVE_ITEM(S5P64X0_CLK_DIV2), + SAVE_ITEM(S5P64X0_CLK_DIV3), + SAVE_ITEM(S5P64X0_CLK_GATE_MEM0), + SAVE_ITEM(S5P64X0_CLK_GATE_HCLK1), + SAVE_ITEM(S5P64X0_CLK_GATE_SCLK1), +}; + +static struct sleep_save s5p64x0_misc_save[] = { + SAVE_ITEM(S5P64X0_AHB_CON0), + SAVE_ITEM(S5P64X0_SPCON0), + SAVE_ITEM(S5P64X0_SPCON1), + SAVE_ITEM(S5P64X0_MEM0CONSLP0), + SAVE_ITEM(S5P64X0_MEM0CONSLP1), + SAVE_ITEM(S5P64X0_MEM0DRVCON), + SAVE_ITEM(S5P64X0_MEM1DRVCON), + + SAVE_ITEM(S3C64XX_TINT_CSTAT), +}; + +/* DPLL is present only in S5P6450 */ +static struct sleep_save s5p6450_core_save[] = { + SAVE_ITEM(S5P6450_DPLL_CON), + SAVE_ITEM(S5P6450_DPLL_CON_K), +}; + +void s3c_pm_configure_extint(void) +{ + __raw_writel(s3c_irqwake_eintmask, S5P64X0_EINT_WAKEUP_MASK); +} + +void s3c_pm_restore_core(void) +{ + __raw_writel(0, S5P64X0_EINT_WAKEUP_MASK); + + s3c_pm_do_restore_core(s5p64x0_core_save, + ARRAY_SIZE(s5p64x0_core_save)); + + if (soc_is_s5p6450()) + s3c_pm_do_restore_core(s5p6450_core_save, + ARRAY_SIZE(s5p6450_core_save)); + + s3c_pm_do_restore(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save)); +} + +void s3c_pm_save_core(void) +{ + s3c_pm_do_save(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save)); + + if (soc_is_s5p6450()) + s3c_pm_do_save(s5p6450_core_save, + ARRAY_SIZE(s5p6450_core_save)); + + s3c_pm_do_save(s5p64x0_core_save, ARRAY_SIZE(s5p64x0_core_save)); +} + +static int s5p64x0_cpu_suspend(unsigned long arg) +{ + unsigned long tmp = 0; + + /* + * Issue the standby signal into the pm unit. Note, we + * issue a write-buffer drain just in case. + */ + asm("b 1f\n\t" + ".align 5\n\t" + "1:\n\t" + "mcr p15, 0, %0, c7, c10, 5\n\t" + "mcr p15, 0, %0, c7, c10, 4\n\t" + "mcr p15, 0, %0, c7, c0, 4" : : "r" (tmp)); + + /* we should never get past here */ + panic("sleep resumed to originator?"); +} + +/* mapping of interrupts to parts of the wakeup mask */ +static struct samsung_wakeup_mask s5p64x0_wake_irqs[] = { + { .irq = IRQ_RTC_ALARM, .bit = S5P64X0_PWR_CFG_RTC_ALRM_DISABLE, }, + { .irq = IRQ_RTC_TIC, .bit = S5P64X0_PWR_CFG_RTC_TICK_DISABLE, }, + { .irq = IRQ_HSMMC0, .bit = S5P64X0_PWR_CFG_MMC0_DISABLE, }, + { .irq = IRQ_HSMMC1, .bit = S5P64X0_PWR_CFG_MMC1_DISABLE, }, +}; + +static void s5p64x0_pm_prepare(void) +{ + u32 tmp; + + samsung_sync_wakemask(S5P64X0_PWR_CFG, + s5p64x0_wake_irqs, ARRAY_SIZE(s5p64x0_wake_irqs)); + + /* store the resume address in INFORM0 register */ + __raw_writel(virt_to_phys(s3c_cpu_resume), S5P64X0_INFORM0); + + /* setup clock gating for FIMGVG block */ + __raw_writel((__raw_readl(S5P64X0_CLK_GATE_HCLK1) | \ + (S5P64X0_CLK_GATE_HCLK1_FIMGVG)), S5P64X0_CLK_GATE_HCLK1); + __raw_writel((__raw_readl(S5P64X0_CLK_GATE_SCLK1) | \ + (S5P64X0_CLK_GATE_SCLK1_FIMGVG)), S5P64X0_CLK_GATE_SCLK1); + + /* Configure the stabilization counter with wait time required */ + __raw_writel(S5P64X0_PWR_STABLE_PWR_CNT_VAL4, S5P64X0_PWR_STABLE); + + /* set WFI to SLEEP mode configuration */ + tmp = __raw_readl(S5P64X0_SLEEP_CFG); + tmp &= ~(S5P64X0_SLEEP_CFG_OSC_EN); + __raw_writel(tmp, S5P64X0_SLEEP_CFG); + + tmp = __raw_readl(S5P64X0_PWR_CFG); + tmp &= ~(S5P64X0_PWR_CFG_WFI_MASK); + tmp |= S5P64X0_PWR_CFG_WFI_SLEEP; + __raw_writel(tmp, S5P64X0_PWR_CFG); + + /* + * set OTHERS register to disable interrupt before going to + * sleep. This bit is present only in S5P6450, it is reserved + * in S5P6440. + */ + if (soc_is_s5p6450()) { + tmp = __raw_readl(S5P64X0_OTHERS); + tmp |= S5P6450_OTHERS_DISABLE_INT; + __raw_writel(tmp, S5P64X0_OTHERS); + } + + /* ensure previous wakeup state is cleared before sleeping */ + __raw_writel(__raw_readl(S5P64X0_WAKEUP_STAT), S5P64X0_WAKEUP_STAT); + +} + +static int s5p64x0_pm_add(struct sys_device *sysdev) +{ + pm_cpu_prep = s5p64x0_pm_prepare; + pm_cpu_sleep = s5p64x0_cpu_suspend; + pm_uart_udivslot = 1; + + return 0; +} + +static struct sysdev_driver s5p64x0_pm_driver = { + .add = s5p64x0_pm_add, +}; + +static __init int s5p64x0_pm_drvinit(void) +{ + s3c_pm_init(); + + return sysdev_driver_register(&s5p64x0_sysclass, &s5p64x0_pm_driver); +} +arch_initcall(s5p64x0_pm_drvinit); + +static void s5p64x0_pm_resume(void) +{ + u32 tmp; + + tmp = __raw_readl(S5P64X0_OTHERS); + tmp |= (S5P64X0_OTHERS_RET_MMC0 | S5P64X0_OTHERS_RET_MMC1 | \ + S5P64X0_OTHERS_RET_UART); + __raw_writel(tmp , S5P64X0_OTHERS); +} + +static struct syscore_ops s5p64x0_pm_syscore_ops = { + .resume = s5p64x0_pm_resume, +}; + +static __init int s5p64x0_pm_syscore_init(void) +{ + register_syscore_ops(&s5p64x0_pm_syscore_ops); + + return 0; +} +arch_initcall(s5p64x0_pm_syscore_init); |