diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index c508e45ca3ce..e83f51ae7f63 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -68,6 +68,15 @@ #define OMAP_RTC_IRQWAKEEN 0x7c +#define OMAP_RTC_ALARM2_SECONDS_REG 0x80 +#define OMAP_RTC_ALARM2_MINUTES_REG 0x84 +#define OMAP_RTC_ALARM2_HOURS_REG 0x88 +#define OMAP_RTC_ALARM2_DAYS_REG 0x8c +#define OMAP_RTC_ALARM2_MONTHS_REG 0x90 +#define OMAP_RTC_ALARM2_YEARS_REG 0x94 + +#define OMAP_RTC_PMIC_REG 0x98 + /* OMAP_RTC_CTRL_REG bit fields: */ #define OMAP_RTC_CTRL_SPLIT BIT(7) #define OMAP_RTC_CTRL_DISABLE BIT(6) @@ -80,6 +89,7 @@ /* OMAP_RTC_STATUS_REG bit fields: */ #define OMAP_RTC_STATUS_POWER_UP BIT(7) +#define OMAP_RTC_STATUS_ALARM2 BIT(7) #define OMAP_RTC_STATUS_ALARM BIT(6) #define OMAP_RTC_STATUS_1D_EVENT BIT(5) #define OMAP_RTC_STATUS_1H_EVENT BIT(4) @@ -89,6 +99,7 @@ #define OMAP_RTC_STATUS_BUSY BIT(0) /* OMAP_RTC_INTERRUPTS_REG bit fields: */ +#define OMAP_RTC_INTERRUPTS_IT_ALARM2 BIT(4) #define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3) #define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2) @@ -98,6 +109,9 @@ /* OMAP_RTC_IRQWAKEEN bit fields: */ #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1) +/* OMAP_RTC_PMIC bit fields: */ +#define OMAP_RTC_PMIC_POWER_EN_EN BIT(16) + /* OMAP_RTC_KICKER values */ #define KICK0_VALUE 0x83e70b13 #define KICK1_VALUE 0x95a4f1e0 @@ -106,6 +120,7 @@ struct omap_rtc_device_type { bool has_32kclk_en; bool has_kicker; bool has_irqwakeen; + bool has_pmic_mode; bool has_power_up_reset; }; @@ -115,6 +130,7 @@ struct omap_rtc { int irq_alarm; int irq_timer; u8 interrupts_reg; + bool is_pmic_controller; const struct omap_rtc_device_type *type; }; @@ -345,6 +361,70 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) return 0; } +static struct omap_rtc *omap_rtc_power_off_rtc; + +/* + * omap_rtc_poweroff: RTC-controlled power off + * + * The RTC can be used to control an external PMIC via the pmic_power_en pin, + * which can be configured to transition to OFF on ALARM2 events. + * + * Notes: + * The two-second alarm offset is the shortest offset possible as the alarm + * registers must be set before the next timer update and the offset + * calculation is too heavy for everything to be done within a single access + * period (~15 us). + * + * Called with local interrupts disabled. + */ +static void omap_rtc_power_off(void) +{ + struct omap_rtc *rtc = omap_rtc_power_off_rtc; + struct rtc_time tm; + unsigned long now; + u32 val; + + /* enable pmic_power_en control */ + val = rtc_readl(rtc, OMAP_RTC_PMIC_REG); + rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN); + + /* set alarm two seconds from now */ + omap_rtc_read_time_raw(rtc, &tm); + bcd2tm(&tm); + rtc_tm_to_time(&tm, &now); + rtc_time_to_tm(now + 2, &tm); + + if (tm2bcd(&tm) < 0) { + dev_err(&rtc->rtc->dev, "power off failed\n"); + return; + } + + rtc_wait_not_busy(rtc); + + rtc_write(rtc, OMAP_RTC_ALARM2_SECONDS_REG, tm.tm_sec); + rtc_write(rtc, OMAP_RTC_ALARM2_MINUTES_REG, tm.tm_min); + rtc_write(rtc, OMAP_RTC_ALARM2_HOURS_REG, tm.tm_hour); + rtc_write(rtc, OMAP_RTC_ALARM2_DAYS_REG, tm.tm_mday); + rtc_write(rtc, OMAP_RTC_ALARM2_MONTHS_REG, tm.tm_mon); + rtc_write(rtc, OMAP_RTC_ALARM2_YEARS_REG, tm.tm_year); + + /* + * enable ALARM2 interrupt + * + * NOTE: this fails on AM3352 if rtc_write (writeb) is used + */ + val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG); + rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG, + val | OMAP_RTC_INTERRUPTS_IT_ALARM2); + + /* + * Wait for alarm to trigger (within two seconds) and external PMIC to + * power off the system. Add a 500 ms margin for external latencies + * (e.g. debounce circuits). + */ + mdelay(2500); +} + static struct rtc_class_ops omap_rtc_ops = { .read_time = omap_rtc_read_time, .set_time = omap_rtc_set_time, @@ -361,6 +441,7 @@ static const struct omap_rtc_device_type omap_rtc_am3352_type = { .has_32kclk_en = true, .has_kicker = true, .has_irqwakeen = true, + .has_pmic_mode = true, }; static const struct omap_rtc_device_type omap_rtc_da830_type = { @@ -412,6 +493,9 @@ static int __init omap_rtc_probe(struct platform_device *pdev) of_id = of_match_device(omap_rtc_of_match, &pdev->dev); if (of_id) { rtc->type = of_id->data; + rtc->is_pmic_controller = rtc->type->has_pmic_mode && + of_property_read_bool(pdev->dev.of_node, + "ti,system-power-controller"); } else { id_entry = platform_get_device_id(pdev); rtc->type = (void *)id_entry->driver_data; @@ -460,6 +544,9 @@ static int __init omap_rtc_probe(struct platform_device *pdev) mask = OMAP_RTC_STATUS_ALARM; + if (rtc->type->has_pmic_mode) + mask |= OMAP_RTC_STATUS_ALARM2; + if (rtc->type->has_power_up_reset) { mask |= OMAP_RTC_STATUS_POWER_UP; if (reg & OMAP_RTC_STATUS_POWER_UP) @@ -520,6 +607,13 @@ static int __init omap_rtc_probe(struct platform_device *pdev) goto err; } + if (rtc->is_pmic_controller) { + if (!pm_power_off) { + omap_rtc_power_off_rtc = rtc; + pm_power_off = omap_rtc_power_off; + } + } + return 0; err: @@ -536,6 +630,12 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) { struct omap_rtc *rtc = platform_get_drvdata(pdev); + if (pm_power_off == omap_rtc_power_off && + omap_rtc_power_off_rtc == rtc) { + pm_power_off = NULL; + omap_rtc_power_off_rtc = NULL; + } + device_init_wakeup(&pdev->dev, 0); /* leave rtc running, but disable irqs */ |