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Commit b6ee15ef authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

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: default avatarSekhar Nori <nsekhar@ti.com>
Tested-by: default avatarKeerthy <j-keerthy@ti.com>
Reviewed-by: default avatarKeerthy <j-keerthy@ti.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 57072758

drivers/rtc/rtc-omap.c

+45 −0
Original line number Diff line number Diff line
@@ -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,