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path: root/drivers/rtc/rtc-pm8xxx.c
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Diffstat (limited to 'drivers/rtc/rtc-pm8xxx.c')
-rw-r--r--drivers/rtc/rtc-pm8xxx.c288
1 files changed, 130 insertions, 158 deletions
diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index 03f8f75d5af2..197699f358c7 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -9,18 +9,16 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
-
+#include <linux/of.h>
#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>
-
-
/* RTC Register offsets from RTC CTRL REG */
#define PM8XXX_ALARM_CTRL_OFFSET 0x01
#define PM8XXX_RTC_WRITE_OFFSET 0x02
@@ -37,6 +35,8 @@
/**
* struct pm8xxx_rtc - rtc driver internal structure
* @rtc: rtc device for this driver.
+ * @regmap: regmap used to access RTC registers
+ * @allow_set_time: indicates whether writing to the RTC is allowed
* @rtc_alarm_irq: rtc alarm irq number.
* @rtc_base: address of rtc control register.
* @rtc_read_base: base address of read registers.
@@ -48,55 +48,19 @@
*/
struct pm8xxx_rtc {
struct rtc_device *rtc;
+ struct regmap *regmap;
+ bool allow_set_time;
int rtc_alarm_irq;
int rtc_base;
int rtc_read_base;
int rtc_write_base;
int alarm_rw_base;
- u8 ctrl_reg;
+ u8 ctrl_reg;
struct device *rtc_dev;
spinlock_t ctrl_reg_lock;
};
/*
- * 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.
@@ -107,9 +71,12 @@ 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);
+ if (!rtc_dd->allow_set_time)
+ return -EACCES;
+
rtc_tm_to_time(tm, &secs);
for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
@@ -125,47 +92,43 @@ 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) {
- dev_err(dev, "Write to RTC control register "
- "failed\n");
+ 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;
}
rtc_dd->ctrl_reg = ctrl_reg;
- } else
+ } else {
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+ }
/* Write 0 to Byte[0] */
- reg = 0;
- rc = pm8xxx_write_wrapper(rtc_dd, &reg, 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) {
- dev_err(dev, "Write to RTC control register "
- "failed\n");
+ 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;
}
rtc_dd->ctrl_reg = ctrl_reg;
@@ -181,13 +144,14 @@ 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;
}
@@ -196,16 +160,16 @@ 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, &reg, rtc_dd->rtc_read_base, 1);
+ rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_read_base, &reg);
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;
}
@@ -222,8 +186,8 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
}
dev_dbg(dev, "secs = %lu, h:m:s == %d:%d:%d, d/m/y = %d/%d/%d\n",
- secs, tm->tm_hour, tm->tm_min, tm->tm_sec,
- tm->tm_mday, tm->tm_mon, tm->tm_year);
+ secs, tm->tm_hour, tm->tm_min, tm->tm_sec,
+ tm->tm_mday, tm->tm_mon, tm->tm_year);
return 0;
}
@@ -244,19 +208,22 @@ 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;
}
ctrl_reg = rtc_dd->ctrl_reg;
- ctrl_reg = alarm->enabled ? (ctrl_reg | PM8xxx_RTC_ALARM_ENABLE) :
- (ctrl_reg & ~PM8xxx_RTC_ALARM_ENABLE);
- rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
- if (rc < 0) {
+ if (alarm->enabled)
+ ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
+ else
+ ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
+
+ 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;
}
@@ -264,9 +231,9 @@ static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
rtc_dd->ctrl_reg = ctrl_reg;
dev_dbg(dev, "Alarm Set for h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
- alarm->time.tm_hour, alarm->time.tm_min,
- alarm->time.tm_sec, alarm->time.tm_mday,
- alarm->time.tm_mon, alarm->time.tm_year);
+ alarm->time.tm_hour, alarm->time.tm_min,
+ alarm->time.tm_sec, alarm->time.tm_mday,
+ alarm->time.tm_mon, alarm->time.tm_year);
rtc_rw_fail:
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
return rc;
@@ -279,9 +246,9 @@ 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;
}
@@ -297,9 +264,9 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
}
dev_dbg(dev, "Alarm set for - h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
- alarm->time.tm_hour, alarm->time.tm_min,
- alarm->time.tm_sec, alarm->time.tm_mday,
- alarm->time.tm_mon, alarm->time.tm_year);
+ alarm->time.tm_hour, alarm->time.tm_min,
+ alarm->time.tm_sec, alarm->time.tm_mday,
+ alarm->time.tm_mon, alarm->time.tm_year);
return 0;
}
@@ -312,12 +279,16 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
u8 ctrl_reg;
spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
+
ctrl_reg = rtc_dd->ctrl_reg;
- ctrl_reg = (enable) ? (ctrl_reg | PM8xxx_RTC_ALARM_ENABLE) :
- (ctrl_reg & ~PM8xxx_RTC_ALARM_ENABLE);
- rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
- if (rc < 0) {
+ if (enable)
+ ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
+ else
+ ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
+
+ 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;
}
@@ -329,8 +300,9 @@ rtc_rw_fail:
return rc;
}
-static struct rtc_class_ops pm8xxx_rtc_ops = {
+static const struct rtc_class_ops pm8xxx_rtc_ops = {
.read_time = pm8xxx_rtc_read_time,
+ .set_time = pm8xxx_rtc_set_time,
.set_alarm = pm8xxx_rtc_set_alarm,
.read_alarm = pm8xxx_rtc_read_alarm,
.alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
@@ -339,7 +311,7 @@ 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;
@@ -351,11 +323,11 @@ 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");
+ dev_err(rtc_dd->rtc_dev,
+ "Write to RTC control register failed\n");
goto rtc_alarm_handled;
}
@@ -363,61 +335,71 @@ 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) {
- dev_err(rtc_dd->rtc_dev, "RTC Alarm control register read "
- "failed\n");
+ 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)
- dev_err(rtc_dd->rtc_dev, "Write to RTC Alarm control register"
- " failed\n");
+ 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");
rtc_alarm_handled:
return IRQ_HANDLED;
}
+/*
+ * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
+ */
+static const struct of_device_id pm8xxx_id_table[] = {
+ { .compatible = "qcom,pm8921-rtc", .data = (void *) 0x11D },
+ { .compatible = "qcom,pm8058-rtc", .data = (void *) 0x1E8 },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
+
static int pm8xxx_rtc_probe(struct platform_device *pdev)
{
int rc;
- u8 ctrl_reg;
- bool rtc_write_enable = false;
+ unsigned int ctrl_reg;
struct pm8xxx_rtc *rtc_dd;
- struct resource *rtc_resource;
- const struct pm8xxx_rtc_platform_data *pdata =
- dev_get_platdata(&pdev->dev);
+ const struct of_device_id *match;
- if (pdata != NULL)
- rtc_write_enable = pdata->rtc_write_enable;
+ match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
- if (rtc_dd == NULL) {
- dev_err(&pdev->dev, "Unable to allocate memory!\n");
+ if (rtc_dd == NULL)
return -ENOMEM;
- }
/* 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");
return -ENXIO;
}
- rtc_resource = platform_get_resource_byname(pdev, IORESOURCE_IO,
- "pmic_rtc_base");
- if (!(rtc_resource && rtc_resource->start)) {
- dev_err(&pdev->dev, "RTC IO resource absent!\n");
- return -ENXIO;
- }
+ rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
+ "allow-set-time");
- rtc_dd->rtc_base = rtc_resource->start;
+ rtc_dd->rtc_base = (long) match->data;
/* Setup RTC register addresses */
rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
@@ -427,64 +409,52 @@ 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) {
- dev_err(&pdev->dev, "Write to RTC control register "
- "failed\n");
+ 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;
}
}
rtc_dd->ctrl_reg = ctrl_reg;
- if (rtc_write_enable == true)
- pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
platform_set_drvdata(pdev, rtc_dd);
+ device_init_wakeup(&pdev->dev, 1);
+
/* Register the RTC device */
rtc_dd->rtc = devm_rtc_device_register(&pdev->dev, "pm8xxx_rtc",
- &pm8xxx_rtc_ops, THIS_MODULE);
+ &pm8xxx_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc_dd->rtc)) {
dev_err(&pdev->dev, "%s: RTC registration failed (%ld)\n",
- __func__, PTR_ERR(rtc_dd->rtc));
+ __func__, PTR_ERR(rtc_dd->rtc));
return PTR_ERR(rtc_dd->rtc);
}
/* Request the alarm IRQ */
- rc = request_any_context_irq(rtc_dd->rtc_alarm_irq,
- pm8xxx_alarm_trigger, IRQF_TRIGGER_RISING,
- "pm8xxx_rtc_alarm", rtc_dd);
+ rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->rtc_alarm_irq,
+ pm8xxx_alarm_trigger,
+ IRQF_TRIGGER_RISING,
+ "pm8xxx_rtc_alarm", rtc_dd);
if (rc < 0) {
dev_err(&pdev->dev, "Request IRQ failed (%d)\n", rc);
return rc;
}
- device_init_wakeup(&pdev->dev, 1);
-
dev_dbg(&pdev->dev, "Probe success !!\n");
return 0;
}
-static int pm8xxx_rtc_remove(struct platform_device *pdev)
-{
- struct pm8xxx_rtc *rtc_dd = platform_get_drvdata(pdev);
-
- device_init_wakeup(&pdev->dev, 0);
- free_irq(rtc_dd->rtc_alarm_irq, rtc_dd);
-
- return 0;
-}
-
#ifdef CONFIG_PM_SLEEP
static int pm8xxx_rtc_resume(struct device *dev)
{
@@ -507,15 +477,17 @@ static int pm8xxx_rtc_suspend(struct device *dev)
}
#endif
-static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops, pm8xxx_rtc_suspend, pm8xxx_rtc_resume);
+static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
+ pm8xxx_rtc_suspend,
+ pm8xxx_rtc_resume);
static struct platform_driver pm8xxx_rtc_driver = {
.probe = pm8xxx_rtc_probe,
- .remove = pm8xxx_rtc_remove,
.driver = {
- .name = PM8XXX_RTC_DEV_NAME,
- .owner = THIS_MODULE,
- .pm = &pm8xxx_rtc_pm_ops,
+ .name = "rtc-pm8xxx",
+ .owner = THIS_MODULE,
+ .pm = &pm8xxx_rtc_pm_ops,
+ .of_match_table = pm8xxx_id_table,
},
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-14 18:00:20 +0000