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authorSamuel Holland <samuel@sholland.org>2022-04-13 18:17:30 -0500
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2022-05-17 22:49:24 +0200
commit581d6d8f483696ff164f52a71beb43a87b718592 (patch)
treea7bc68b0707255ab94da6b3626cb85af881299fc /drivers/rtc
parent3123109284176b1532874591f7c81f3837bbdc17 (diff)
downloadlinux-581d6d8f483696ff164f52a71beb43a87b718592.tar.bz2
rtc: sun6i: Add NVMEM provider
The sun6i RTC provides 32 bytes of general-purpose data registers. They can be used to save data in the always-on RTC power domain. The registers are writable via 32-bit MMIO accesses only. Expose them with a NVMEM provider so they can be used by other drivers. Signed-off-by: Samuel Holland <samuel@sholland.org> Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220413231731.56709-1-samuel@sholland.org
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-sun6i.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index 5b3e4da63406..755aeb82a285 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -71,6 +71,10 @@
#define SUN6I_LOSC_OUT_GATING 0x0060
#define SUN6I_LOSC_OUT_GATING_EN_OFFSET 0
+/* General-purpose data */
+#define SUN6I_GP_DATA 0x0100
+#define SUN6I_GP_DATA_SIZE 0x20
+
/*
* Get date values
*/
@@ -662,6 +666,39 @@ static const struct rtc_class_ops sun6i_rtc_ops = {
.alarm_irq_enable = sun6i_rtc_alarm_irq_enable
};
+static int sun6i_rtc_nvmem_read(void *priv, unsigned int offset, void *_val, size_t bytes)
+{
+ struct sun6i_rtc_dev *chip = priv;
+ u32 *val = _val;
+ int i;
+
+ for (i = 0; i < bytes / 4; ++i)
+ val[i] = readl(chip->base + SUN6I_GP_DATA + offset + 4 * i);
+
+ return 0;
+}
+
+static int sun6i_rtc_nvmem_write(void *priv, unsigned int offset, void *_val, size_t bytes)
+{
+ struct sun6i_rtc_dev *chip = priv;
+ u32 *val = _val;
+ int i;
+
+ for (i = 0; i < bytes / 4; ++i)
+ writel(val[i], chip->base + SUN6I_GP_DATA + offset + 4 * i);
+
+ return 0;
+}
+
+static struct nvmem_config sun6i_rtc_nvmem_cfg = {
+ .type = NVMEM_TYPE_BATTERY_BACKED,
+ .reg_read = sun6i_rtc_nvmem_read,
+ .reg_write = sun6i_rtc_nvmem_write,
+ .size = SUN6I_GP_DATA_SIZE,
+ .word_size = 4,
+ .stride = 4,
+};
+
#ifdef CONFIG_PM_SLEEP
/* Enable IRQ wake on suspend, to wake up from RTC. */
static int sun6i_rtc_suspend(struct device *dev)
@@ -795,6 +832,11 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
if (ret)
return ret;
+ sun6i_rtc_nvmem_cfg.priv = chip;
+ ret = devm_rtc_nvmem_register(chip->rtc, &sun6i_rtc_nvmem_cfg);
+ if (ret)
+ return ret;
+
dev_info(&pdev->dev, "RTC enabled\n");
return 0;