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path: root/drivers/rtc/rtc-snvs.c
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Diffstat (limited to 'drivers/rtc/rtc-snvs.c')
-rw-r--r--drivers/rtc/rtc-snvs.c132
1 files changed, 67 insertions, 65 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index d87a85cefb66..950c5d0b6dca 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -18,6 +18,10 @@
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#define SNVS_LPREGISTER_OFFSET 0x34
/* These register offsets are relative to LP (Low Power) range */
#define SNVS_LPCR 0x04
@@ -37,31 +41,36 @@
struct snvs_rtc_data {
struct rtc_device *rtc;
- void __iomem *ioaddr;
+ struct regmap *regmap;
+ int offset;
int irq;
- spinlock_t lock;
struct clk *clk;
};
-static u32 rtc_read_lp_counter(void __iomem *ioaddr)
+static u32 rtc_read_lp_counter(struct snvs_rtc_data *data)
{
u64 read1, read2;
+ u32 val;
do {
- read1 = readl(ioaddr + SNVS_LPSRTCMR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
+ read1 = val;
read1 <<= 32;
- read1 |= readl(ioaddr + SNVS_LPSRTCLR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
+ read1 |= val;
- read2 = readl(ioaddr + SNVS_LPSRTCMR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
+ read2 = val;
read2 <<= 32;
- read2 |= readl(ioaddr + SNVS_LPSRTCLR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
+ read2 |= val;
} while (read1 != read2);
/* Convert 47-bit counter to 32-bit raw second count */
return (u32) (read1 >> CNTR_TO_SECS_SH);
}
-static void rtc_write_sync_lp(void __iomem *ioaddr)
+static void rtc_write_sync_lp(struct snvs_rtc_data *data)
{
u32 count1, count2, count3;
int i;
@@ -69,15 +78,15 @@ static void rtc_write_sync_lp(void __iomem *ioaddr)
/* Wait for 3 CKIL cycles */
for (i = 0; i < 3; i++) {
do {
- count1 = readl(ioaddr + SNVS_LPSRTCLR);
- count2 = readl(ioaddr + SNVS_LPSRTCLR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count1);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
} while (count1 != count2);
/* Now wait until counter value changes */
do {
do {
- count2 = readl(ioaddr + SNVS_LPSRTCLR);
- count3 = readl(ioaddr + SNVS_LPSRTCLR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
+ regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count3);
} while (count2 != count3);
} while (count3 == count1);
}
@@ -85,23 +94,14 @@ static void rtc_write_sync_lp(void __iomem *ioaddr)
static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
{
- unsigned long flags;
int timeout = 1000;
u32 lpcr;
- spin_lock_irqsave(&data->lock, flags);
-
- lpcr = readl(data->ioaddr + SNVS_LPCR);
- if (enable)
- lpcr |= SNVS_LPCR_SRTC_ENV;
- else
- lpcr &= ~SNVS_LPCR_SRTC_ENV;
- writel(lpcr, data->ioaddr + SNVS_LPCR);
-
- spin_unlock_irqrestore(&data->lock, flags);
+ regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_SRTC_ENV,
+ enable ? SNVS_LPCR_SRTC_ENV : 0);
while (--timeout) {
- lpcr = readl(data->ioaddr + SNVS_LPCR);
+ regmap_read(data->regmap, data->offset + SNVS_LPCR, &lpcr);
if (enable) {
if (lpcr & SNVS_LPCR_SRTC_ENV)
@@ -121,7 +121,7 @@ static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
- unsigned long time = rtc_read_lp_counter(data->ioaddr);
+ unsigned long time = rtc_read_lp_counter(data);
rtc_time_to_tm(time, tm);
@@ -139,8 +139,8 @@ static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm)
snvs_rtc_enable(data, false);
/* Write 32-bit time to 47-bit timer, leaving 15 LSBs blank */
- writel(time << CNTR_TO_SECS_SH, data->ioaddr + SNVS_LPSRTCLR);
- writel(time >> (32 - CNTR_TO_SECS_SH), data->ioaddr + SNVS_LPSRTCMR);
+ regmap_write(data->regmap, data->offset + SNVS_LPSRTCLR, time << CNTR_TO_SECS_SH);
+ regmap_write(data->regmap, data->offset + SNVS_LPSRTCMR, time >> (32 - CNTR_TO_SECS_SH));
/* Enable RTC again */
snvs_rtc_enable(data, true);
@@ -153,10 +153,10 @@ static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct snvs_rtc_data *data = dev_get_drvdata(dev);
u32 lptar, lpsr;
- lptar = readl(data->ioaddr + SNVS_LPTAR);
+ regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
rtc_time_to_tm(lptar, &alrm->time);
- lpsr = readl(data->ioaddr + SNVS_LPSR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;
return 0;
@@ -165,21 +165,12 @@ static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
- u32 lpcr;
- unsigned long flags;
-
- spin_lock_irqsave(&data->lock, flags);
- lpcr = readl(data->ioaddr + SNVS_LPCR);
- if (enable)
- lpcr |= (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN);
- else
- lpcr &= ~(SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN);
- writel(lpcr, data->ioaddr + SNVS_LPCR);
+ regmap_update_bits(data->regmap, data->offset + SNVS_LPCR,
+ (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN),
+ enable ? (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN) : 0);
- spin_unlock_irqrestore(&data->lock, flags);
-
- rtc_write_sync_lp(data->ioaddr);
+ rtc_write_sync_lp(data);
return 0;
}
@@ -189,24 +180,14 @@ static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct snvs_rtc_data *data = dev_get_drvdata(dev);
struct rtc_time *alrm_tm = &alrm->time;
unsigned long time;
- unsigned long flags;
- u32 lpcr;
rtc_tm_to_time(alrm_tm, &time);
- spin_lock_irqsave(&data->lock, flags);
-
- /* Have to clear LPTA_EN before programming new alarm time in LPTAR */
- lpcr = readl(data->ioaddr + SNVS_LPCR);
- lpcr &= ~SNVS_LPCR_LPTA_EN;
- writel(lpcr, data->ioaddr + SNVS_LPCR);
-
- spin_unlock_irqrestore(&data->lock, flags);
-
- writel(time, data->ioaddr + SNVS_LPTAR);
+ regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
+ regmap_write(data->regmap, data->offset + SNVS_LPTAR, time);
/* Clear alarm interrupt status bit */
- writel(SNVS_LPSR_LPTA, data->ioaddr + SNVS_LPSR);
+ regmap_write(data->regmap, data->offset + SNVS_LPSR, SNVS_LPSR_LPTA);
return snvs_rtc_alarm_irq_enable(dev, alrm->enabled);
}
@@ -226,7 +207,7 @@ static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
u32 lpsr;
u32 events = 0;
- lpsr = readl(data->ioaddr + SNVS_LPSR);
+ regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
if (lpsr & SNVS_LPSR_LPTA) {
events |= (RTC_AF | RTC_IRQF);
@@ -238,25 +219,48 @@ static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
}
/* clear interrupt status */
- writel(lpsr, data->ioaddr + SNVS_LPSR);
+ regmap_write(data->regmap, data->offset + SNVS_LPSR, lpsr);
return events ? IRQ_HANDLED : IRQ_NONE;
}
+static const struct regmap_config snvs_rtc_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
static int snvs_rtc_probe(struct platform_device *pdev)
{
struct snvs_rtc_data *data;
struct resource *res;
int ret;
+ void __iomem *mmio;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(data->ioaddr))
- return PTR_ERR(data->ioaddr);
+ data->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
+
+ if (IS_ERR(data->regmap)) {
+ dev_warn(&pdev->dev, "snvs rtc: you use old dts file, please update it\n");
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ mmio = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(mmio))
+ return PTR_ERR(mmio);
+
+ data->regmap = devm_regmap_init_mmio(&pdev->dev, mmio, &snvs_rtc_config);
+ } else {
+ data->offset = SNVS_LPREGISTER_OFFSET;
+ of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
+ }
+
+ if (!data->regmap) {
+ dev_err(&pdev->dev, "Can't find snvs syscon\n");
+ return -ENODEV;
+ }
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
@@ -276,13 +280,11 @@ static int snvs_rtc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
- spin_lock_init(&data->lock);
-
/* Initialize glitch detect */
- writel(SNVS_LPPGDR_INIT, data->ioaddr + SNVS_LPPGDR);
+ regmap_write(data->regmap, data->offset + SNVS_LPPGDR, SNVS_LPPGDR_INIT);
/* Clear interrupt status */
- writel(0xffffffff, data->ioaddr + SNVS_LPSR);
+ regmap_write(data->regmap, data->offset + SNVS_LPSR, 0xffffffff);
/* Enable RTC */
snvs_rtc_enable(data, true);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-06 16:47:36 +0300