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rtc: twl: kill static variables

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The current code uses static variables which prevent
the use of multiple rtc twl instances.
We also make it clear that this driver supports only
TWL4030 and TWL6030 classes.

Signed-off-by: Nicolae Rosia <Nicolae_Rosia@mentor.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Nicolae Rosia 2016-11-23 10:55:56 +02:00 committed by Alexandre Belloni
parent 72d3d79f8d
commit e3e7f95bca
1 changed files with 114 additions and 76 deletions
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190
drivers/rtc/rtc-twl.c
View File

@ -33,6 +33,10 @@
#include <linux/i2c/twl.h>
enum twl_class {
TWL_4030 = 0,
TWL_6030,
};
/*
* RTC block register offsets (use TWL_MODULE_RTC)
@ -136,16 +140,30 @@ static const u8 twl6030_rtc_reg_map[] = {
#define ALL_TIME_REGS 6
/*----------------------------------------------------------------------*/
static u8 *rtc_reg_map;
struct twl_rtc {
struct device *dev;
struct rtc_device *rtc;
u8 *reg_map;
/*
* Cache the value for timer/alarm interrupts register; this is
* only changed by callers holding rtc ops lock (or resume).
*/
unsigned char rtc_irq_bits;
bool wake_enabled;
#ifdef CONFIG_PM_SLEEP
unsigned char irqstat;
#endif
enum twl_class class;
};
/*
* Supports 1 byte read from TWL RTC register.
*/
static int twl_rtc_read_u8(u8 *data, u8 reg)
static int twl_rtc_read_u8(struct twl_rtc *twl_rtc, u8 *data, u8 reg)
{
int ret;
ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
if (ret < 0)
pr_err("Could not read TWL register %X - error %d\n", reg, ret);
return ret;
@ -154,40 +172,34 @@ static int twl_rtc_read_u8(u8 *data, u8 reg)
/*
* Supports 1 byte write to TWL RTC registers.
*/
static int twl_rtc_write_u8(u8 data, u8 reg)
static int twl_rtc_write_u8(struct twl_rtc *twl_rtc, u8 data, u8 reg)
{
int ret;
ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
if (ret < 0)
pr_err("Could not write TWL register %X - error %d\n",
reg, ret);
return ret;
}
/*
* Cache the value for timer/alarm interrupts register; this is
* only changed by callers holding rtc ops lock (or resume).
*/
static unsigned char rtc_irq_bits;
/*
* Enable 1/second update and/or alarm interrupts.
*/
static int set_rtc_irq_bit(unsigned char bit)
static int set_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
{
unsigned char val;
int ret;
/* if the bit is set, return from here */
if (rtc_irq_bits & bit)
if (twl_rtc->rtc_irq_bits & bit)
return 0;
val = rtc_irq_bits | bit;
val = twl_rtc->rtc_irq_bits | bit;
val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
if (ret == 0)
rtc_irq_bits = val;
twl_rtc->rtc_irq_bits = val;
return ret;
}
@ -195,19 +207,19 @@ static int set_rtc_irq_bit(unsigned char bit)
/*
* Disable update and/or alarm interrupts.
*/
static int mask_rtc_irq_bit(unsigned char bit)
static int mask_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
{
unsigned char val;
int ret;
/* if the bit is clear, return from here */
if (!(rtc_irq_bits & bit))
if (!(twl_rtc->rtc_irq_bits & bit))
return 0;
val = rtc_irq_bits & ~bit;
ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
val = twl_rtc->rtc_irq_bits & ~bit;
ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
if (ret == 0)
rtc_irq_bits = val;
twl_rtc->rtc_irq_bits = val;
return ret;
}
@ -215,21 +227,23 @@ static int mask_rtc_irq_bit(unsigned char bit)
static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
{
struct platform_device *pdev = to_platform_device(dev);
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
int irq = platform_get_irq(pdev, 0);
static bool twl_rtc_wake_enabled;
int ret;
if (enabled) {
ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
if (device_can_wakeup(dev) && !twl_rtc_wake_enabled) {
ret = set_rtc_irq_bit(twl_rtc,
BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
if (device_can_wakeup(dev) && !twl_rtc->wake_enabled) {
enable_irq_wake(irq);
twl_rtc_wake_enabled = true;
twl_rtc->wake_enabled = true;
}
} else {
ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
if (twl_rtc_wake_enabled) {
ret = mask_rtc_irq_bit(twl_rtc,
BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
if (twl_rtc->wake_enabled) {
disable_irq_wake(irq);
twl_rtc_wake_enabled = false;
twl_rtc->wake_enabled = false;
}
}
@ -247,21 +261,23 @@ static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
*/
static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
unsigned char rtc_data[ALL_TIME_REGS];
int ret;
u8 save_control;
u8 rtc_control;
ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
if (ret < 0) {
dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
return ret;
}
/* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
if (twl_class_is_6030()) {
if (twl_rtc->class == TWL_6030) {
if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
ret = twl_rtc_write_u8(twl_rtc, save_control,
REG_RTC_CTRL_REG);
if (ret < 0) {
dev_err(dev, "%s clr GET_TIME, error %d\n",
__func__, ret);
@ -274,17 +290,17 @@ static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
/* for twl6030/32 enable read access to static shadowed registers */
if (twl_class_is_6030())
if (twl_rtc->class == TWL_6030)
rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
ret = twl_rtc_write_u8(twl_rtc, rtc_control, REG_RTC_CTRL_REG);
if (ret < 0) {
dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
return ret;
}
ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
(rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
if (ret < 0) {
dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
@ -292,8 +308,8 @@ static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
}
/* for twl6030 restore original state of rtc control register */
if (twl_class_is_6030()) {
ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
if (twl_rtc->class == TWL_6030) {
ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
if (ret < 0) {
dev_err(dev, "%s: restore CTRL_REG, error %d\n",
__func__, ret);
@ -313,6 +329,7 @@ static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
unsigned char save_control;
unsigned char rtc_data[ALL_TIME_REGS];
int ret;
@ -325,18 +342,18 @@ static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
rtc_data[5] = bin2bcd(tm->tm_year - 100);
/* Stop RTC while updating the TC registers */
ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
if (ret < 0)
goto out;
save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
if (ret < 0)
goto out;
/* update all the time registers in one shot */
ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
(rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
if (ret < 0) {
dev_err(dev, "rtc_set_time error %d\n", ret);
goto out;
@ -344,7 +361,7 @@ static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
/* Start back RTC */
save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
out:
return ret;
@ -355,11 +372,12 @@ out:
*/
static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
unsigned char rtc_data[ALL_TIME_REGS];
int ret;
ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
(rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
if (ret < 0) {
dev_err(dev, "rtc_read_alarm error %d\n", ret);
return ret;
@ -374,7 +392,7 @@ static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
/* report cached alarm enable state */
if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
if (twl_rtc->rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
alm->enabled = 1;
return ret;
@ -382,6 +400,8 @@ static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
unsigned char alarm_data[ALL_TIME_REGS];
int ret;
@ -398,7 +418,7 @@ static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
/* update all the alarm registers in one shot */
ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
(rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
if (ret) {
dev_err(dev, "rtc_set_alarm error %d\n", ret);
goto out;
@ -410,14 +430,15 @@ out:
return ret;
}
static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
static irqreturn_t twl_rtc_interrupt(int irq, void *data)
{
struct twl_rtc *twl_rtc = data;
unsigned long events;
int ret = IRQ_NONE;
int res;
u8 rd_reg;
res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
res = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
if (res)
goto out;
/*
@ -431,12 +452,12 @@ static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
else
events = RTC_IRQF | RTC_PF;
res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
REG_RTC_STATUS_REG);
res = twl_rtc_write_u8(twl_rtc, BIT_RTC_STATUS_REG_ALARM_M,
REG_RTC_STATUS_REG);
if (res)
goto out;
if (twl_class_is_4030()) {
if (twl_rtc->class == TWL_4030) {
/* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
* needs 2 reads to clear the interrupt. One read is done in
* do_twl_pwrirq(). Doing the second read, to clear
@ -455,7 +476,7 @@ static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
}
/* Notify RTC core on event */
rtc_update_irq(rtc, 1, events);
rtc_update_irq(twl_rtc->rtc, 1, events);
ret = IRQ_HANDLED;
out:
@ -474,7 +495,7 @@ static const struct rtc_class_ops twl_rtc_ops = {
static int twl_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
struct twl_rtc *twl_rtc;
int ret = -EINVAL;
int irq = platform_get_irq(pdev, 0);
u8 rd_reg;
@ -482,13 +503,22 @@ static int twl_rtc_probe(struct platform_device *pdev)
if (irq <= 0)
return ret;
/* Initialize the register map */
if (twl_class_is_4030())
rtc_reg_map = (u8 *)twl4030_rtc_reg_map;
else
rtc_reg_map = (u8 *)twl6030_rtc_reg_map;
twl_rtc = devm_kzalloc(&pdev->dev, sizeof(*twl_rtc), GFP_KERNEL);
if (!twl_rtc)
return -ENOMEM;
ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
if (twl_class_is_4030()) {
twl_rtc->class = TWL_4030;
twl_rtc->reg_map = (u8 *)twl4030_rtc_reg_map;
} else if (twl_class_is_6030()) {
twl_rtc->class = TWL_6030;
twl_rtc->reg_map = (u8 *)twl6030_rtc_reg_map;
} else {
dev_err(&pdev->dev, "TWL Class not supported.\n");
return -EINVAL;
}
ret = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
if (ret < 0)
return ret;
@ -499,11 +529,11 @@ static int twl_rtc_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
/* Clear RTC Power up reset and pending alarm interrupts */
ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
ret = twl_rtc_write_u8(twl_rtc, rd_reg, REG_RTC_STATUS_REG);
if (ret < 0)
return ret;
if (twl_class_is_6030()) {
if (twl_rtc->class == TWL_6030) {
twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
REG_INT_MSK_LINE_A);
twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
@ -511,40 +541,42 @@ static int twl_rtc_probe(struct platform_device *pdev)
}
dev_info(&pdev->dev, "Enabling TWL-RTC\n");
ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
ret = twl_rtc_write_u8(twl_rtc, BIT_RTC_CTRL_REG_STOP_RTC_M,
REG_RTC_CTRL_REG);
if (ret < 0)
return ret;
/* ensure interrupts are disabled, bootloaders can be strange */
ret = twl_rtc_write_u8(0, REG_RTC_INTERRUPTS_REG);
ret = twl_rtc_write_u8(twl_rtc, 0, REG_RTC_INTERRUPTS_REG);
if (ret < 0)
dev_warn(&pdev->dev, "unable to disable interrupt\n");
/* init cached IRQ enable bits */
ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
ret = twl_rtc_read_u8(twl_rtc, &twl_rtc->rtc_irq_bits,
REG_RTC_INTERRUPTS_REG);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, twl_rtc);
device_init_wakeup(&pdev->dev, 1);
rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
twl_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&twl_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
if (IS_ERR(twl_rtc->rtc)) {
dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
PTR_ERR(rtc));
return PTR_ERR(rtc);
PTR_ERR(twl_rtc->rtc));
return PTR_ERR(twl_rtc->rtc);
}
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
twl_rtc_interrupt,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
dev_name(&rtc->dev), rtc);
dev_name(&twl_rtc->rtc->dev), twl_rtc);
if (ret < 0) {
dev_err(&pdev->dev, "IRQ is not free.\n");
return ret;
}
platform_set_drvdata(pdev, rtc);
return 0;
}
@ -554,10 +586,12 @@ static int twl_rtc_probe(struct platform_device *pdev)
*/
static int twl_rtc_remove(struct platform_device *pdev)
{
struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
/* leave rtc running, but disable irqs */
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
if (twl_class_is_6030()) {
mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
if (twl_rtc->class == TWL_6030) {
twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
REG_INT_MSK_LINE_A);
twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
@ -569,25 +603,29 @@ static int twl_rtc_remove(struct platform_device *pdev)
static void twl_rtc_shutdown(struct platform_device *pdev)
{
struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
/* mask timer interrupts, but leave alarm interrupts on to enable
power-on when alarm is triggered */
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
}
#ifdef CONFIG_PM_SLEEP
static unsigned char irqstat;
static int twl_rtc_suspend(struct device *dev)
{
irqstat = rtc_irq_bits;
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
twl_rtc->irqstat = twl_rtc->rtc_irq_bits;
mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
return 0;
}
static int twl_rtc_resume(struct device *dev)
{
set_rtc_irq_bit(irqstat);
struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
set_rtc_irq_bit(twl_rtc, twl_rtc->irqstat);
return 0;
}
#endif