drivers/rtc/rtc-pm8xxx.c: rework to support pm8941 rtc

Adds support for RTC device inside PM8941 PMIC.  The RTC in this PMIC
have two register spaces.  Thus the rtc-pm8xxx is slightly reworked to
reflect these differences.

The register set for different PMIC chips are selected on DT compatible
string base.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: simplify and fix locking in pm8xxx_rtc_set_time()]
Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Josh Cartwright <joshc@codeaurora.org>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stanimir Varbanov 2014-10-29 14:50:33 -07:00 committed by Linus Torvalds
parent 6d50e60cd2
commit c8d523a4b0
2 changed files with 135 additions and 89 deletions

View file

@ -1320,7 +1320,7 @@ config RTC_DRV_LPC32XX
config RTC_DRV_PM8XXX
tristate "Qualcomm PMIC8XXX RTC"
depends on MFD_PM8XXX
depends on MFD_PM8XXX || MFD_SPMI_PMIC
help
If you say yes here you get support for the
Qualcomm PMIC8XXX RTC.

View file

@ -27,21 +27,36 @@
/* RTC_CTRL register bit fields */
#define PM8xxx_RTC_ENABLE BIT(7)
#define PM8xxx_RTC_ALARM_ENABLE BIT(1)
#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
#define NUM_8_BIT_RTC_REGS 0x4
/**
* struct pm8xxx_rtc_regs - describe RTC registers per PMIC versions
* @ctrl: base address of control register
* @write: base address of write register
* @read: base address of read register
* @alarm_ctrl: base address of alarm control register
* @alarm_ctrl2: base address of alarm control2 register
* @alarm_rw: base address of alarm read-write register
* @alarm_en: alarm enable mask
*/
struct pm8xxx_rtc_regs {
unsigned int ctrl;
unsigned int write;
unsigned int read;
unsigned int alarm_ctrl;
unsigned int alarm_ctrl2;
unsigned int alarm_rw;
unsigned int alarm_en;
};
/**
* 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.
* @rtc_write_base: base address of write registers.
* @alarm_rw_base: base address of alarm registers.
* @ctrl_reg: rtc control register.
* @rtc_dev: device structure.
* @ctrl_reg_lock: spinlock protecting access to ctrl_reg.
@ -51,11 +66,7 @@ struct pm8xxx_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;
const struct pm8xxx_rtc_regs *regs;
struct device *rtc_dev;
spinlock_t ctrl_reg_lock;
};
@ -71,8 +82,10 @@ 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], alarm_enabled = 0, ctrl_reg;
u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0;
unsigned int ctrl_reg;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
if (!rtc_dd->allow_set_time)
return -EACCES;
@ -87,30 +100,30 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
ctrl_reg = rtc_dd->ctrl_reg;
if (ctrl_reg & PM8xxx_RTC_ALARM_ENABLE) {
rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg);
if (rc)
goto rtc_rw_fail;
if (ctrl_reg & regs->alarm_en) {
alarm_enabled = 1;
ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
ctrl_reg &= ~regs->alarm_en;
rc = regmap_write(rtc_dd->regmap, regs->ctrl, 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 {
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
}
/* Write 0 to Byte[0] */
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, 0);
rc = regmap_write(rtc_dd->regmap, regs->write, 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 = regmap_bulk_write(rtc_dd->regmap, rtc_dd->rtc_write_base + 1,
rc = regmap_bulk_write(rtc_dd->regmap, regs->write + 1,
&value[1], sizeof(value) - 1);
if (rc) {
dev_err(dev, "Write to RTC write data register failed\n");
@ -118,25 +131,23 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
}
/* Write Byte[0] */
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, value[0]);
rc = regmap_write(rtc_dd->regmap, regs->write, 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 = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
ctrl_reg |= regs->alarm_en;
rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);
if (rc) {
dev_err(dev, "Write to RTC control register failed\n");
goto rtc_rw_fail;
}
rtc_dd->ctrl_reg = ctrl_reg;
}
rtc_rw_fail:
if (alarm_enabled)
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
return rc;
}
@ -148,9 +159,9 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
unsigned long secs;
unsigned int reg;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base,
value, sizeof(value));
rc = regmap_bulk_read(rtc_dd->regmap, regs->read, value, sizeof(value));
if (rc) {
dev_err(dev, "RTC read data register failed\n");
return rc;
@ -160,14 +171,14 @@ 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 = regmap_read(rtc_dd->regmap, rtc_dd->rtc_read_base, &reg);
rc = regmap_read(rtc_dd->regmap, regs->read, &reg);
if (rc < 0) {
dev_err(dev, "RTC read data register failed\n");
return rc;
}
if (unlikely(reg < value[0])) {
rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base,
rc = regmap_bulk_read(rtc_dd->regmap, regs->read,
value, sizeof(value));
if (rc) {
dev_err(dev, "RTC read data register failed\n");
@ -195,9 +206,11 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int rc, i;
u8 value[NUM_8_BIT_RTC_REGS], ctrl_reg;
u8 value[NUM_8_BIT_RTC_REGS];
unsigned int ctrl_reg;
unsigned long secs, irq_flags;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
rtc_tm_to_time(&alarm->time, &secs);
@ -208,28 +221,28 @@ static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
rc = regmap_bulk_write(rtc_dd->regmap, rtc_dd->alarm_rw_base, value,
rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, 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;
rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
if (rc)
goto rtc_rw_fail;
if (alarm->enabled)
ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
ctrl_reg |= regs->alarm_en;
else
ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
ctrl_reg &= ~regs->alarm_en;
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
if (rc) {
dev_err(dev, "Write to RTC control register failed\n");
dev_err(dev, "Write to RTC alarm control register failed\n");
goto rtc_rw_fail;
}
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,
@ -245,8 +258,9 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
u8 value[NUM_8_BIT_RTC_REGS];
unsigned long secs;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->alarm_rw_base, value,
rc = regmap_bulk_read(rtc_dd->regmap, regs->alarm_rw, value,
sizeof(value));
if (rc) {
dev_err(dev, "RTC alarm time read failed\n");
@ -276,25 +290,26 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
int rc;
unsigned long irq_flags;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
u8 ctrl_reg;
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
unsigned int ctrl_reg;
spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
ctrl_reg = rtc_dd->ctrl_reg;
rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
if (rc)
goto rtc_rw_fail;
if (enable)
ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
ctrl_reg |= regs->alarm_en;
else
ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
ctrl_reg &= ~regs->alarm_en;
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
if (rc) {
dev_err(dev, "Write to RTC control register failed\n");
goto rtc_rw_fail;
}
rtc_dd->ctrl_reg = ctrl_reg;
rtc_rw_fail:
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
return rc;
@ -311,6 +326,7 @@ static const 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;
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
unsigned int ctrl_reg;
int rc;
unsigned long irq_flags;
@ -320,48 +336,100 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
/* Clear the alarm enable bit */
ctrl_reg = rtc_dd->ctrl_reg;
ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
if (rc) {
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
goto rtc_alarm_handled;
}
rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
ctrl_reg &= ~regs->alarm_en;
rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, 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");
"Write to alarm control register failed\n");
goto rtc_alarm_handled;
}
rtc_dd->ctrl_reg = ctrl_reg;
spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
/* Clear RTC alarm register */
rc = regmap_read(rtc_dd->regmap,
rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET,
&ctrl_reg);
rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl2, &ctrl_reg);
if (rc) {
dev_err(rtc_dd->rtc_dev,
"RTC Alarm control register read failed\n");
"RTC Alarm control2 register read failed\n");
goto rtc_alarm_handled;
}
ctrl_reg &= ~PM8xxx_RTC_ALARM_CLEAR;
rc = regmap_write(rtc_dd->regmap,
rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET,
ctrl_reg);
ctrl_reg |= PM8xxx_RTC_ALARM_CLEAR;
rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl2, ctrl_reg);
if (rc)
dev_err(rtc_dd->rtc_dev,
"Write to RTC Alarm control register failed\n");
"Write to RTC Alarm control2 register failed\n");
rtc_alarm_handled:
return IRQ_HANDLED;
}
static int pm8xxx_rtc_enable(struct pm8xxx_rtc *rtc_dd)
{
const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
unsigned int ctrl_reg;
int rc;
/* Check if the RTC is on, else turn it on */
rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg);
if (rc)
return rc;
if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
ctrl_reg |= PM8xxx_RTC_ENABLE;
rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);
if (rc)
return rc;
}
return 0;
}
static const struct pm8xxx_rtc_regs pm8921_regs = {
.ctrl = 0x11d,
.write = 0x11f,
.read = 0x123,
.alarm_rw = 0x127,
.alarm_ctrl = 0x11d,
.alarm_ctrl2 = 0x11e,
.alarm_en = BIT(1),
};
static const struct pm8xxx_rtc_regs pm8058_regs = {
.ctrl = 0x1e8,
.write = 0x1ea,
.read = 0x1ee,
.alarm_rw = 0x1f2,
.alarm_ctrl = 0x1e8,
.alarm_ctrl2 = 0x1e9,
.alarm_en = BIT(1),
};
static const struct pm8xxx_rtc_regs pm8941_regs = {
.ctrl = 0x6046,
.write = 0x6040,
.read = 0x6048,
.alarm_rw = 0x6140,
.alarm_ctrl = 0x6146,
.alarm_ctrl2 = 0x6148,
.alarm_en = BIT(7),
};
/*
* 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 },
{ .compatible = "qcom,pm8921-rtc", .data = &pm8921_regs },
{ .compatible = "qcom,pm8058-rtc", .data = &pm8058_regs },
{ .compatible = "qcom,pm8941-rtc", .data = &pm8941_regs },
{ },
};
MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
@ -369,7 +437,6 @@ MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
static int pm8xxx_rtc_probe(struct platform_device *pdev)
{
int rc;
unsigned int ctrl_reg;
struct pm8xxx_rtc *rtc_dd;
const struct of_device_id *match;
@ -399,33 +466,12 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
"allow-set-time");
rtc_dd->rtc_base = (long) match->data;
/* Setup RTC register addresses */
rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
rtc_dd->rtc_read_base = rtc_dd->rtc_base + PM8XXX_RTC_READ_OFFSET;
rtc_dd->alarm_rw_base = rtc_dd->rtc_base + PM8XXX_ALARM_RW_OFFSET;
rtc_dd->regs = match->data;
rtc_dd->rtc_dev = &pdev->dev;
/* Check if the RTC is on, else turn it on */
rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_base, &ctrl_reg);
if (rc) {
dev_err(&pdev->dev, "RTC control register read failed!\n");
rc = pm8xxx_rtc_enable(rtc_dd);
if (rc)
return rc;
}
if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
ctrl_reg |= PM8xxx_RTC_ENABLE;
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;
platform_set_drvdata(pdev, rtc_dd);