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| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-10-31 19:27:31 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-11-08 09:52:15 +0300 |
| commit | b6ee15efe6788113c4184843365f74fde08e6284 (patch) | |
| tree | 64ac32053e7ec187752e19e92e6b86ef897d1de9 /drivers/rtc | |
| parent | 57072758623fa4f3019bce65e2b00f24af8dfdd7 (diff) | |
| download | linux-b6ee15efe6788113c4184843365f74fde08e6284.tar.xz | |
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>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index d56d937966dc..1d666ac9ef70 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -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, |