diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-prima2/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mach-prima2/pm.c | 149 | ||||
| -rw-r--r-- | arch/arm/mach-prima2/pm.h | 29 | ||||
| -rw-r--r-- | arch/arm/mach-prima2/sleep.S | 64 |
4 files changed, 243 insertions, 0 deletions
diff --git a/arch/arm/mach-prima2/Makefile b/arch/arm/mach-prima2/Makefile index f49d70b86854..13dd1604d951 100644 --- a/arch/arm/mach-prima2/Makefile +++ b/arch/arm/mach-prima2/Makefile @@ -6,3 +6,4 @@ obj-y += prima2.o obj-y += rtciobrg.o obj-$(CONFIG_DEBUG_LL) += lluart.o obj-$(CONFIG_CACHE_L2X0) += l2x0.o +obj-$(CONFIG_SUSPEND) += pm.o sleep.o diff --git a/arch/arm/mach-prima2/pm.c b/arch/arm/mach-prima2/pm.c new file mode 100644 index 000000000000..0ba39f3e16ba --- /dev/null +++ b/arch/arm/mach-prima2/pm.c @@ -0,0 +1,149 @@ +/* + * power management entry for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include <linux/kernel.h> +#include <linux/suspend.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/io.h> +#include <linux/rtc/sirfsoc_rtciobrg.h> +#include <asm/suspend.h> +#include <asm/hardware/cache-l2x0.h> + +#include "pm.h" + +/* + * suspend asm codes will access these to make DRAM become self-refresh and + * system sleep + */ +u32 sirfsoc_pwrc_base; +void __iomem *sirfsoc_memc_base; + +static void sirfsoc_set_wakeup_source(void) +{ + u32 pwr_trigger_en_reg; + pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base + + SIRFSOC_PWRC_TRIGGER_EN); +#define X_ON_KEY_B (1 << 0) + sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B, + sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN); +} + +static void sirfsoc_set_sleep_mode(u32 mode) +{ + u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base + + SIRFSOC_PWRC_PDN_CTRL); + sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1); + sleep_mode |= mode << 1; + sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base + + SIRFSOC_PWRC_PDN_CTRL); +} + +static int sirfsoc_pre_suspend_power_off(void) +{ + u32 wakeup_entry = virt_to_phys(cpu_resume); + + sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base + + SIRFSOC_PWRC_SCRATCH_PAD1); + + sirfsoc_set_wakeup_source(); + + sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE); + + return 0; +} + +static int sirfsoc_pm_enter(suspend_state_t state) +{ + switch (state) { + case PM_SUSPEND_MEM: + sirfsoc_pre_suspend_power_off(); + + outer_flush_all(); + outer_disable(); + /* go zzz */ + cpu_suspend(0, sirfsoc_finish_suspend); + break; + default: + return -EINVAL; + } + return 0; +} + +static const struct platform_suspend_ops sirfsoc_pm_ops = { + .enter = sirfsoc_pm_enter, + .valid = suspend_valid_only_mem, +}; + +static int __init sirfsoc_pm_init(void) +{ + suspend_set_ops(&sirfsoc_pm_ops); + return 0; +} +late_initcall(sirfsoc_pm_init); + +static const struct of_device_id pwrc_ids[] = { + { .compatible = "sirf,prima2-pwrc" }, + {} +}; + +static int __init sirfsoc_of_pwrc_init(void) +{ + struct device_node *np; + + np = of_find_matching_node(NULL, pwrc_ids); + if (!np) + panic("unable to find compatible pwrc node in dtb\n"); + + /* + * pwrc behind rtciobrg is not located in memory space + * though the property is named reg. reg only means base + * offset for pwrc. then of_iomap is not suitable here. + */ + if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base)) + panic("unable to find base address of pwrc node in dtb\n"); + + of_node_put(np); + + return 0; +} +postcore_initcall(sirfsoc_of_pwrc_init); + +static const struct of_device_id memc_ids[] = { + { .compatible = "sirf,prima2-memc" }, + {} +}; + +static int __devinit sirfsoc_memc_probe(struct platform_device *op) +{ + struct device_node *np = op->dev.of_node; + + sirfsoc_memc_base = of_iomap(np, 0); + if (!sirfsoc_memc_base) + panic("unable to map memc registers\n"); + + return 0; +} + +static struct platform_driver sirfsoc_memc_driver = { + .probe = sirfsoc_memc_probe, + .driver = { + .name = "sirfsoc-memc", + .owner = THIS_MODULE, + .of_match_table = memc_ids, + }, +}; + +static int __init sirfsoc_memc_init(void) +{ + return platform_driver_register(&sirfsoc_memc_driver); +} +postcore_initcall(sirfsoc_memc_init); diff --git a/arch/arm/mach-prima2/pm.h b/arch/arm/mach-prima2/pm.h new file mode 100644 index 000000000000..bae6d77e01ab --- /dev/null +++ b/arch/arm/mach-prima2/pm.h @@ -0,0 +1,29 @@ +/* + * arch/arm/mach-prima2/pm.h + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#ifndef _MACH_PRIMA2_PM_H_ +#define _MACH_PRIMA2_PM_H_ + +#define SIRFSOC_PWR_SLEEPFORCE 0x01 + +#define SIRFSOC_SLEEP_MODE_MASK 0x3 +#define SIRFSOC_DEEP_SLEEP_MODE 0x1 + +#define SIRFSOC_PWRC_PDN_CTRL 0x0 +#define SIRFSOC_PWRC_PON_OFF 0x4 +#define SIRFSOC_PWRC_TRIGGER_EN 0x8 +#define SIRFSOC_PWRC_PIN_STATUS 0x14 +#define SIRFSOC_PWRC_SCRATCH_PAD1 0x18 +#define SIRFSOC_PWRC_SCRATCH_PAD2 0x1C + +#ifndef __ASSEMBLY__ +extern int sirfsoc_finish_suspend(unsigned long); +#endif + +#endif + diff --git a/arch/arm/mach-prima2/sleep.S b/arch/arm/mach-prima2/sleep.S new file mode 100644 index 000000000000..0745abc365fc --- /dev/null +++ b/arch/arm/mach-prima2/sleep.S @@ -0,0 +1,64 @@ +/* + * sleep mode for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include <linux/linkage.h> +#include <asm/ptrace.h> +#include <asm/assembler.h> + +#include "pm.h" + +#define DENALI_CTL_22_OFF 0x58 +#define DENALI_CTL_112_OFF 0x1c0 + + .text + +ENTRY(sirfsoc_finish_suspend) + @ r5: mem controller + ldr r0, =sirfsoc_memc_base + ldr r5, [r0] + @ r6: pwrc base offset + ldr r0, =sirfsoc_pwrc_base + ldr r6, [r0] + @ r7: rtc iobrg controller + ldr r0, =sirfsoc_rtciobrg_base + ldr r7, [r0] + + @ Read the power control register and set the + @ sleep force bit. + add r0, r6, #SIRFSOC_PWRC_PDN_CTRL + bl __sirfsoc_rtc_iobrg_readl + orr r0,r0,#SIRFSOC_PWR_SLEEPFORCE + add r1, r6, #SIRFSOC_PWRC_PDN_CTRL + bl sirfsoc_rtc_iobrg_pre_writel + mov r1, #0x1 + + @ read the MEM ctl register and set the self + @ refresh bit + + ldr r2, [r5, #DENALI_CTL_22_OFF] + orr r2, r2, #0x1 + + @ Following code has to run from cache since + @ the RAM is going to self refresh mode + .align 5 + str r2, [r5, #DENALI_CTL_22_OFF] + +1: + ldr r4, [r5, #DENALI_CTL_112_OFF] + tst r4, #0x1 + bne 1b + + @ write SLEEPFORCE through rtc iobridge + + str r1, [r7] + @ wait rtc io bridge sync +1: + ldr r3, [r7] + tst r3, #0x01 + bne 1b + b . |