Register an nvmem device to expose the 3 scratch registers (total of 12
bytes) to both userspace and kernel space.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-omap.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
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,
--
2.15.0.rc2
