diff options
Diffstat (limited to 'drivers/soc/ti/pm33xx.c')
| -rw-r--r-- | drivers/soc/ti/pm33xx.c | 191 |
1 files changed, 182 insertions, 9 deletions
diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c index 69128993776d..fc5802ccb1c0 100644 --- a/drivers/soc/ti/pm33xx.c +++ b/drivers/soc/ti/pm33xx.c @@ -6,6 +6,7 @@ * Vaibhav Bedia, Dave Gerlach */ +#include <linux/clk.h> #include <linux/cpu.h> #include <linux/err.h> #include <linux/genalloc.h> @@ -13,9 +14,12 @@ #include <linux/init.h> #include <linux/io.h> #include <linux/module.h> +#include <linux/nvmem-consumer.h> #include <linux/of.h> #include <linux/platform_data/pm33xx.h> #include <linux/platform_device.h> +#include <linux/rtc.h> +#include <linux/rtc/rtc-omap.h> #include <linux/sizes.h> #include <linux/sram.h> #include <linux/suspend.h> @@ -29,20 +33,47 @@ #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \ (unsigned long)pm_sram->do_wfi) +#define RTC_SCRATCH_RESUME_REG 0 +#define RTC_SCRATCH_MAGIC_REG 1 +#define RTC_REG_BOOT_MAGIC 0x8cd0 /* RTC */ +#define GIC_INT_SET_PENDING_BASE 0x200 +#define AM43XX_GIC_DIST_BASE 0x48241000 + +static u32 rtc_magic_val; + static int (*am33xx_do_wfi_sram)(unsigned long unused); static phys_addr_t am33xx_do_wfi_sram_phys; static struct gen_pool *sram_pool, *sram_pool_data; static unsigned long ocmcram_location, ocmcram_location_data; +static struct rtc_device *omap_rtc; +static void __iomem *gic_dist_base; + static struct am33xx_pm_platform_data *pm_ops; static struct am33xx_pm_sram_addr *pm_sram; static struct device *pm33xx_dev; static struct wkup_m3_ipc *m3_ipc; +#ifdef CONFIG_SUSPEND +static int rtc_only_idle; +static int retrigger_irq; static unsigned long suspend_wfi_flags; +static struct wkup_m3_wakeup_src wakeup_src = {.irq_nr = 0, + .src = "Unknown", +}; + +static struct wkup_m3_wakeup_src rtc_alarm_wakeup = { + .irq_nr = 108, .src = "RTC Alarm", +}; + +static struct wkup_m3_wakeup_src rtc_ext_wakeup = { + .irq_nr = 0, .src = "Ext wakeup", +}; +#endif + static u32 sram_suspend_address(unsigned long addr) { return ((unsigned long)am33xx_do_wfi_sram + @@ -99,13 +130,65 @@ static int am33xx_push_sram_idle(void) return 0; } +static int __init am43xx_map_gic(void) +{ + gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K); + + if (!gic_dist_base) + return -ENOMEM; + + return 0; +} + #ifdef CONFIG_SUSPEND +struct wkup_m3_wakeup_src rtc_wake_src(void) +{ + u32 i; + + i = __raw_readl(pm_ops->get_rtc_base_addr() + 0x44) & 0x40; + + if (i) { + retrigger_irq = rtc_alarm_wakeup.irq_nr; + return rtc_alarm_wakeup; + } + + retrigger_irq = rtc_ext_wakeup.irq_nr; + + return rtc_ext_wakeup; +} + +int am33xx_rtc_only_idle(unsigned long wfi_flags) +{ + omap_rtc_power_off_program(&omap_rtc->dev); + am33xx_do_wfi_sram(wfi_flags); + return 0; +} + static int am33xx_pm_suspend(suspend_state_t suspend_state) { int i, ret = 0; - ret = pm_ops->soc_suspend((unsigned long)suspend_state, - am33xx_do_wfi_sram, suspend_wfi_flags); + if (suspend_state == PM_SUSPEND_MEM && + pm_ops->check_off_mode_enable()) { + pm_ops->prepare_rtc_suspend(); + pm_ops->save_context(); + suspend_wfi_flags |= WFI_FLAG_RTC_ONLY; + clk_save_context(); + ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle, + suspend_wfi_flags); + + suspend_wfi_flags &= ~WFI_FLAG_RTC_ONLY; + + if (!ret) { + clk_restore_context(); + pm_ops->restore_context(); + m3_ipc->ops->set_rtc_only(m3_ipc); + am33xx_push_sram_idle(); + } + } else { + ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram, + suspend_wfi_flags); + } if (ret) { dev_err(pm33xx_dev, "PM: Kernel suspend failure\n"); @@ -127,8 +210,20 @@ static int am33xx_pm_suspend(suspend_state_t suspend_state) "PM: CM3 returned unknown result = %d\n", i); ret = -1; } + + /* print the wakeup reason */ + if (rtc_only_idle) { + wakeup_src = rtc_wake_src(); + pr_info("PM: Wakeup source %s\n", wakeup_src.src); + } else { + pr_info("PM: Wakeup source %s\n", + m3_ipc->ops->request_wake_src(m3_ipc)); + } } + if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) + pm_ops->prepare_rtc_resume(); + return ret; } @@ -151,6 +246,18 @@ static int am33xx_pm_enter(suspend_state_t suspend_state) static int am33xx_pm_begin(suspend_state_t state) { int ret = -EINVAL; + struct nvmem_device *nvmem; + + if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) { + nvmem = devm_nvmem_device_get(&omap_rtc->dev, + "omap_rtc_scratch0"); + if (nvmem) + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, + (void *)&rtc_magic_val); + rtc_only_idle = 1; + } else { + rtc_only_idle = 0; + } switch (state) { case PM_SUSPEND_MEM: @@ -166,7 +273,28 @@ static int am33xx_pm_begin(suspend_state_t state) static void am33xx_pm_end(void) { + u32 val = 0; + struct nvmem_device *nvmem; + + nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0"); m3_ipc->ops->finish_low_power(m3_ipc); + if (rtc_only_idle) { + if (retrigger_irq) + /* + * 32 bits of Interrupt Set-Pending correspond to 32 + * 32 interrupts. Compute the bit offset of the + * Interrupt and set that particular bit + * Compute the register offset by dividing interrupt + * number by 32 and mutiplying by 4 + */ + writel_relaxed(1 << (retrigger_irq & 31), + gic_dist_base + GIC_INT_SET_PENDING_BASE + + retrigger_irq / 32 * 4); + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, + (void *)&val); + } + + rtc_only_idle = 0; } static int am33xx_pm_valid(suspend_state_t state) @@ -269,6 +397,42 @@ mpu_put_node: return ret; } +static int am33xx_pm_rtc_setup(void) +{ + struct device_node *np; + unsigned long val = 0; + struct nvmem_device *nvmem; + + np = of_find_node_by_name(NULL, "rtc"); + + if (of_device_is_available(np)) { + omap_rtc = rtc_class_open("rtc0"); + if (!omap_rtc) { + pr_warn("PM: rtc0 not available"); + return -EPROBE_DEFER; + } + + nvmem = devm_nvmem_device_get(&omap_rtc->dev, + "omap_rtc_scratch0"); + if (nvmem) { + nvmem_device_read(nvmem, RTC_SCRATCH_MAGIC_REG * 4, + 4, (void *)&rtc_magic_val); + if ((rtc_magic_val & 0xffff) != RTC_REG_BOOT_MAGIC) + pr_warn("PM: bootloader does not support rtc-only!\n"); + + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, + 4, (void *)&val); + val = pm_sram->resume_address; + nvmem_device_write(nvmem, RTC_SCRATCH_RESUME_REG * 4, + 4, (void *)&val); + } + } else { + pr_warn("PM: no-rtc available, rtc-only mode disabled.\n"); + } + + return 0; +} + static int am33xx_pm_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -284,34 +448,42 @@ static int am33xx_pm_probe(struct platform_device *pdev) return -ENODEV; } + ret = am43xx_map_gic(); + if (ret) { + pr_err("PM: Could not ioremap GIC base\n"); + return ret; + } + pm_sram = pm_ops->get_sram_addrs(); if (!pm_sram) { dev_err(dev, "PM: Cannot get PM asm function addresses!!\n"); return -ENODEV; } + m3_ipc = wkup_m3_ipc_get(); + if (!m3_ipc) { + pr_err("PM: Cannot get wkup_m3_ipc handle\n"); + return -EPROBE_DEFER; + } + pm33xx_dev = dev; ret = am33xx_pm_alloc_sram(); if (ret) return ret; - ret = am33xx_push_sram_idle(); + ret = am33xx_pm_rtc_setup(); if (ret) goto err_free_sram; - m3_ipc = wkup_m3_ipc_get(); - if (!m3_ipc) { - dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n"); - ret = -EPROBE_DEFER; + ret = am33xx_push_sram_idle(); + if (ret) goto err_free_sram; - } am33xx_pm_set_ipc_ops(); #ifdef CONFIG_SUSPEND suspend_set_ops(&am33xx_pm_ops); -#endif /* CONFIG_SUSPEND */ /* * For a system suspend we must flush the caches, we want @@ -323,6 +495,7 @@ static int am33xx_pm_probe(struct platform_device *pdev) suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH; suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF; suspend_wfi_flags |= WFI_FLAG_WAKE_M3; +#endif /* CONFIG_SUSPEND */ ret = pm_ops->init(); if (ret) { |