diff options
-rw-r--r-- | drivers/rtc/rtc-pm8xxx.c | 145 |
1 files changed, 57 insertions, 88 deletions
diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c index af60ee4..cdc9dc2 100644 --- a/drivers/rtc/rtc-pm8xxx.c +++ b/drivers/rtc/rtc-pm8xxx.c @@ -13,11 +13,12 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/rtc.h> +#include <linux/platform_device.h> #include <linux/pm.h> +#include <linux/regmap.h> #include <linux/slab.h> #include <linux/spinlock.h> -#include <linux/mfd/pm8xxx/core.h> #include <linux/mfd/pm8xxx/rtc.h> @@ -37,6 +38,7 @@ /** * struct pm8xxx_rtc - rtc driver internal structure * @rtc: rtc device for this driver. + * @regmap: regmap used to access RTC registers * @rtc_alarm_irq: rtc alarm irq number. * @rtc_base: address of rtc control register. * @rtc_read_base: base address of read registers. @@ -48,6 +50,7 @@ */ struct pm8xxx_rtc { struct rtc_device *rtc; + struct regmap *regmap; int rtc_alarm_irq; int rtc_base; int rtc_read_base; @@ -59,44 +62,6 @@ struct pm8xxx_rtc { }; /* - * The RTC registers need to be read/written one byte at a time. This is a - * hardware limitation. - */ -static int pm8xxx_read_wrapper(struct pm8xxx_rtc *rtc_dd, u8 *rtc_val, - int base, int count) -{ - int i, rc; - struct device *parent = rtc_dd->rtc_dev->parent; - - for (i = 0; i < count; i++) { - rc = pm8xxx_readb(parent, base + i, &rtc_val[i]); - if (rc < 0) { - dev_err(rtc_dd->rtc_dev, "PMIC read failed\n"); - return rc; - } - } - - return 0; -} - -static int pm8xxx_write_wrapper(struct pm8xxx_rtc *rtc_dd, u8 *rtc_val, - int base, int count) -{ - int i, rc; - struct device *parent = rtc_dd->rtc_dev->parent; - - for (i = 0; i < count; i++) { - rc = pm8xxx_writeb(parent, base + i, rtc_val[i]); - if (rc < 0) { - dev_err(rtc_dd->rtc_dev, "PMIC write failed\n"); - return rc; - } - } - - return 0; -} - -/* * Steps to write the RTC registers. * 1. Disable alarm if enabled. * 2. Write 0x00 to LSB. @@ -107,7 +72,7 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) { int rc, i; unsigned long secs, irq_flags; - u8 value[NUM_8_BIT_RTC_REGS], reg = 0, alarm_enabled = 0, ctrl_reg; + u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, ctrl_reg; struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev); rtc_tm_to_time(tm, &secs); @@ -125,9 +90,8 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) if (ctrl_reg & PM8xxx_RTC_ALARM_ENABLE) { alarm_enabled = 1; ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, - 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { dev_err(dev, "Write to RTC control register failed\n"); goto rtc_rw_fail; } @@ -137,33 +101,31 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) } /* Write 0 to Byte[0] */ - reg = 0; - rc = pm8xxx_write_wrapper(rtc_dd, ®, rtc_dd->rtc_write_base, 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, 0); + if (rc) { dev_err(dev, "Write to RTC write data register failed\n"); goto rtc_rw_fail; } /* Write Byte[1], Byte[2], Byte[3] */ - rc = pm8xxx_write_wrapper(rtc_dd, value + 1, - rtc_dd->rtc_write_base + 1, 3); - if (rc < 0) { + rc = regmap_bulk_write(rtc_dd->regmap, rtc_dd->rtc_write_base + 1, + &value[1], sizeof(value) - 1); + if (rc) { dev_err(dev, "Write to RTC write data register failed\n"); goto rtc_rw_fail; } /* Write Byte[0] */ - rc = pm8xxx_write_wrapper(rtc_dd, value, rtc_dd->rtc_write_base, 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, value[0]); + if (rc) { dev_err(dev, "Write to RTC write data register failed\n"); goto rtc_rw_fail; } if (alarm_enabled) { ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, - 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { dev_err(dev, "Write to RTC control register failed\n"); goto rtc_rw_fail; } @@ -180,13 +142,14 @@ rtc_rw_fail: static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm) { int rc; - u8 value[NUM_8_BIT_RTC_REGS], reg; + u8 value[NUM_8_BIT_RTC_REGS]; unsigned long secs; + unsigned int reg; struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev); - rc = pm8xxx_read_wrapper(rtc_dd, value, rtc_dd->rtc_read_base, - NUM_8_BIT_RTC_REGS); - if (rc < 0) { + rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base, + value, sizeof(value)); + if (rc) { dev_err(dev, "RTC read data register failed\n"); return rc; } @@ -195,17 +158,16 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm) * Read the LSB again and check if there has been a carry over. * If there is, redo the read operation. */ - rc = pm8xxx_read_wrapper(rtc_dd, ®, rtc_dd->rtc_read_base, 1); + rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_read_base, ®); if (rc < 0) { dev_err(dev, "RTC read data register failed\n"); return rc; } if (unlikely(reg < value[0])) { - rc = pm8xxx_read_wrapper(rtc_dd, value, - rtc_dd->rtc_read_base, - NUM_8_BIT_RTC_REGS); - if (rc < 0) { + rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base, + value, sizeof(value)); + if (rc) { dev_err(dev, "RTC read data register failed\n"); return rc; } @@ -244,9 +206,9 @@ static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags); - rc = pm8xxx_write_wrapper(rtc_dd, value, rtc_dd->alarm_rw_base, - NUM_8_BIT_RTC_REGS); - if (rc < 0) { + rc = regmap_bulk_write(rtc_dd->regmap, rtc_dd->alarm_rw_base, value, + sizeof(value)); + if (rc) { dev_err(dev, "Write to RTC ALARM register failed\n"); goto rtc_rw_fail; } @@ -258,8 +220,8 @@ static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) else ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { dev_err(dev, "Write to RTC control register failed\n"); goto rtc_rw_fail; } @@ -282,9 +244,9 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) unsigned long secs; struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev); - rc = pm8xxx_read_wrapper(rtc_dd, value, rtc_dd->alarm_rw_base, - NUM_8_BIT_RTC_REGS); - if (rc < 0) { + rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->alarm_rw_base, value, + sizeof(value)); + if (rc) { dev_err(dev, "RTC alarm time read failed\n"); return rc; } @@ -323,8 +285,8 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) else ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { dev_err(dev, "Write to RTC control register failed\n"); goto rtc_rw_fail; } @@ -346,7 +308,7 @@ static struct rtc_class_ops pm8xxx_rtc_ops = { static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id) { struct pm8xxx_rtc *rtc_dd = dev_id; - u8 ctrl_reg; + unsigned int ctrl_reg; int rc; unsigned long irq_flags; @@ -358,8 +320,8 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id) ctrl_reg = rtc_dd->ctrl_reg; ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags); dev_err(rtc_dd->rtc_dev, "Write to RTC control register failed\n"); @@ -370,18 +332,20 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id) spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags); /* Clear RTC alarm register */ - rc = pm8xxx_read_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base + - PM8XXX_ALARM_CTRL_OFFSET, 1); - if (rc < 0) { + rc = regmap_read(rtc_dd->regmap, + rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET, + &ctrl_reg); + if (rc) { dev_err(rtc_dd->rtc_dev, "RTC Alarm control register read failed\n"); goto rtc_alarm_handled; } ctrl_reg &= ~PM8xxx_RTC_ALARM_CLEAR; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base + - PM8XXX_ALARM_CTRL_OFFSET, 1); - if (rc < 0) + rc = regmap_write(rtc_dd->regmap, + rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET, + ctrl_reg); + if (rc) dev_err(rtc_dd->rtc_dev, "Write to RTC Alarm control register failed\n"); @@ -392,7 +356,7 @@ rtc_alarm_handled: static int pm8xxx_rtc_probe(struct platform_device *pdev) { int rc; - u8 ctrl_reg; + unsigned int ctrl_reg; bool rtc_write_enable = false; struct pm8xxx_rtc *rtc_dd; struct resource *rtc_resource; @@ -409,6 +373,12 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev) /* Initialise spinlock to protect RTC control register */ spin_lock_init(&rtc_dd->ctrl_reg_lock); + rtc_dd->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!rtc_dd->regmap) { + dev_err(&pdev->dev, "Parent regmap unavailable.\n"); + return -ENXIO; + } + rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0); if (rtc_dd->rtc_alarm_irq < 0) { dev_err(&pdev->dev, "Alarm IRQ resource absent!\n"); @@ -432,17 +402,16 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev) rtc_dd->rtc_dev = &pdev->dev; /* Check if the RTC is on, else turn it on */ - rc = pm8xxx_read_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1); - if (rc < 0) { + rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_base, &ctrl_reg); + if (rc) { dev_err(&pdev->dev, "RTC control register read failed!\n"); return rc; } if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) { ctrl_reg |= PM8xxx_RTC_ENABLE; - rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, - 1); - if (rc < 0) { + rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg); + if (rc) { dev_err(&pdev->dev, "Write to RTC control register failed\n"); return rc; |