diff options
Diffstat (limited to 'arch/arm/mach-s5pv210/pm.c')
| -rw-r--r-- | arch/arm/mach-s5pv210/pm.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c new file mode 100644 index 00000000000..549d7924fd4 --- /dev/null +++ b/arch/arm/mach-s5pv210/pm.c @@ -0,0 +1,166 @@ +/* linux/arch/arm/mach-s5pv210/pm.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * S5PV210 - Power Management support + * + * Based on arch/arm/mach-s3c2410/pm.c + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * 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/init.h> +#include <linux/suspend.h> +#include <linux/io.h> + +#include <plat/cpu.h> +#include <plat/pm.h> +#include <plat/regs-timer.h> + +#include <mach/regs-irq.h> +#include <mach/regs-clock.h> + +static struct sleep_save s5pv210_core_save[] = { + /* Clock source */ + SAVE_ITEM(S5P_CLK_SRC0), + SAVE_ITEM(S5P_CLK_SRC1), + SAVE_ITEM(S5P_CLK_SRC2), + SAVE_ITEM(S5P_CLK_SRC3), + SAVE_ITEM(S5P_CLK_SRC4), + SAVE_ITEM(S5P_CLK_SRC5), + SAVE_ITEM(S5P_CLK_SRC6), + + /* Clock source Mask */ + SAVE_ITEM(S5P_CLK_SRC_MASK0), + SAVE_ITEM(S5P_CLK_SRC_MASK1), + + /* Clock Divider */ + SAVE_ITEM(S5P_CLK_DIV0), + SAVE_ITEM(S5P_CLK_DIV1), + SAVE_ITEM(S5P_CLK_DIV2), + SAVE_ITEM(S5P_CLK_DIV3), + SAVE_ITEM(S5P_CLK_DIV4), + SAVE_ITEM(S5P_CLK_DIV5), + SAVE_ITEM(S5P_CLK_DIV6), + SAVE_ITEM(S5P_CLK_DIV7), + + /* Clock Main Gate */ + SAVE_ITEM(S5P_CLKGATE_MAIN0), + SAVE_ITEM(S5P_CLKGATE_MAIN1), + SAVE_ITEM(S5P_CLKGATE_MAIN2), + + /* Clock source Peri Gate */ + SAVE_ITEM(S5P_CLKGATE_PERI0), + SAVE_ITEM(S5P_CLKGATE_PERI1), + + /* Clock source SCLK Gate */ + SAVE_ITEM(S5P_CLKGATE_SCLK0), + SAVE_ITEM(S5P_CLKGATE_SCLK1), + + /* Clock IP Clock gate */ + SAVE_ITEM(S5P_CLKGATE_IP0), + SAVE_ITEM(S5P_CLKGATE_IP1), + SAVE_ITEM(S5P_CLKGATE_IP2), + SAVE_ITEM(S5P_CLKGATE_IP3), + SAVE_ITEM(S5P_CLKGATE_IP4), + + /* Clock Blcok and Bus gate */ + SAVE_ITEM(S5P_CLKGATE_BLOCK), + SAVE_ITEM(S5P_CLKGATE_BUS0), + + /* Clock ETC */ + SAVE_ITEM(S5P_CLK_OUT), + SAVE_ITEM(S5P_MDNIE_SEL), + + /* PWM Register */ + SAVE_ITEM(S3C2410_TCFG0), + SAVE_ITEM(S3C2410_TCFG1), + SAVE_ITEM(S3C64XX_TINT_CSTAT), + SAVE_ITEM(S3C2410_TCON), + SAVE_ITEM(S3C2410_TCNTB(0)), + SAVE_ITEM(S3C2410_TCMPB(0)), + SAVE_ITEM(S3C2410_TCNTO(0)), +}; + +void s5pv210_cpu_suspend(void) +{ + unsigned long tmp; + + /* issue the standby signal into the pm unit. Note, we + * issue a write-buffer drain just in case */ + + tmp = 0; + + 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" + "wfi" : : "r" (tmp)); + + /* we should never get past here */ + panic("sleep resumed to originator?"); +} + +static void s5pv210_pm_prepare(void) +{ + unsigned int tmp; + + /* ensure at least INFORM0 has the resume address */ + __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0); + + tmp = __raw_readl(S5P_SLEEP_CFG); + tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN); + __raw_writel(tmp, S5P_SLEEP_CFG); + + /* WFI for SLEEP mode configuration by SYSCON */ + tmp = __raw_readl(S5P_PWR_CFG); + tmp &= S5P_CFG_WFI_CLEAN; + tmp |= S5P_CFG_WFI_SLEEP; + __raw_writel(tmp, S5P_PWR_CFG); + + /* SYSCON interrupt handling disable */ + tmp = __raw_readl(S5P_OTHERS); + tmp |= S5P_OTHER_SYSC_INTOFF; + __raw_writel(tmp, S5P_OTHERS); + + s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save)); +} + +static int s5pv210_pm_add(struct sys_device *sysdev) +{ + pm_cpu_prep = s5pv210_pm_prepare; + pm_cpu_sleep = s5pv210_cpu_suspend; + + return 0; +} + +static int s5pv210_pm_resume(struct sys_device *dev) +{ + u32 tmp; + + tmp = __raw_readl(S5P_OTHERS); + tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\ + S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART); + __raw_writel(tmp , S5P_OTHERS); + + s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save)); + + return 0; +} + +static struct sysdev_driver s5pv210_pm_driver = { + .add = s5pv210_pm_add, + .resume = s5pv210_pm_resume, +}; + +static __init int s5pv210_pm_drvinit(void) +{ + return sysdev_driver_register(&s5pv210_sysclass, &s5pv210_pm_driver); +} +arch_initcall(s5pv210_pm_drvinit); |