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rtc: omap: Support scratch registers 

Register an nvmem device to expose the 3 scratch registers (total of 12
bytes) to both userspace and kernel space.

Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
hifive-unleashed-5.1
Alexandre Belloni 2017-10-31 17:27:31 +01:00
parent 5707275862
commit b6ee15efe6
1 changed files with 45 additions and 0 deletions
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45
drivers/rtc/rtc-omap.c
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@ -70,6 +70,10 @@
#define OMAP_RTC_COMP_MSB_REG 0x50
#define OMAP_RTC_OSC_REG 0x54
#define OMAP_RTC_SCRATCH0_REG 0x60
#define OMAP_RTC_SCRATCH1_REG 0x64
#define OMAP_RTC_SCRATCH2_REG 0x68
#define OMAP_RTC_KICK0_REG 0x6c
#define OMAP_RTC_KICK1_REG 0x70
@ -667,6 +671,45 @@ static struct pinctrl_desc rtc_pinctrl_desc = {
.owner = THIS_MODULE,
};
static int omap_rtc_scratch_read(void *priv, unsigned int offset, void *_val,
size_t bytes)
{
struct omap_rtc *rtc = priv;
u32 *val = _val;
int i;
for (i = 0; i < bytes / 4; i++)
val[i] = rtc_readl(rtc,
OMAP_RTC_SCRATCH0_REG + offset + (i * 4));
return 0;
}
static int omap_rtc_scratch_write(void *priv, unsigned int offset, void *_val,
size_t bytes)
{
struct omap_rtc *rtc = priv;
u32 *val = _val;
int i;
rtc->type->unlock(rtc);
for (i = 0; i < bytes / 4; i++)
rtc_writel(rtc,
OMAP_RTC_SCRATCH0_REG + offset + (i * 4), val[i]);
rtc->type->lock(rtc);
return 0;
}
static struct nvmem_config omap_rtc_nvmem_config = {
.name = "omap_rtc_scratch",
.word_size = 4,
.stride = 4,
.size = OMAP_RTC_KICK0_REG - OMAP_RTC_SCRATCH0_REG,
.reg_read = omap_rtc_scratch_read,
.reg_write = omap_rtc_scratch_write,
};
static int omap_rtc_probe(struct platform_device *pdev)
{
struct omap_rtc *rtc;
@ -804,6 +847,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
}
rtc->rtc->ops = &omap_rtc_ops;
omap_rtc_nvmem_config.priv = rtc;
rtc->rtc->nvmem_config = &omap_rtc_nvmem_config;
/* handle periodic and alarm irqs */
ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,