From: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
Date: Sat, 28 May 2022 19:36:13 +0200
Export SRAM using nvmem.
Signed-off-by: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
---
drivers/rtc/rtc-twl.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
index c24d1e18f56c..31877522b379 100644
--- a/drivers/rtc/rtc-twl.c
+++ b/drivers/rtc/rtc-twl.c
@@ -487,11 +487,24 @@ static const struct rtc_class_ops twl_rtc_ops = {
.alarm_irq_enable = twl_rtc_alarm_irq_enable,
};
+static int twl_nvram_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ return twl_i2c_read((long)priv, val, offset, bytes);
+}
+
+static int twl_nvram_write(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ return twl_i2c_write((long)priv, val, offset, bytes);
+}
+
/*----------------------------------------------------------------------*/
static int twl_rtc_probe(struct platform_device *pdev)
{
struct twl_rtc *twl_rtc;
+ struct nvmem_config nvmem_cfg;
struct device_node *np = pdev->dev.of_node;
int ret = -EINVAL;
int irq = platform_get_irq(pdev, 0);
@@ -579,6 +592,30 @@ static int twl_rtc_probe(struct platform_device *pdev)
return ret;
}
+ memset(&nvmem_cfg, 0, sizeof(nvmem_cfg));
+ nvmem_cfg.name = "twl-secured-";
+ nvmem_cfg.type = NVMEM_TYPE_BATTERY_BACKED;
+ nvmem_cfg.reg_read = twl_nvram_read,
+ nvmem_cfg.reg_write = twl_nvram_write,
+ nvmem_cfg.word_size = 1;
+ nvmem_cfg.stride = 1;
+ if (twl_class_is_4030()) {
+ /* 20 bytes SECURED_REG area */
+ nvmem_cfg.size = 20;
+ nvmem_cfg.priv = (void *)TWL_MODULE_SECURED_REG;
+ devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
+ /* 8 bytes BACKUP area */
+ nvmem_cfg.name = "twl-backup-";
+ nvmem_cfg.size = 8;
+ nvmem_cfg.priv = (void *)TWL4030_MODULE_BACKUP;
+ devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
+ } else {
+ /* 8 bytes SECURED_REG area */
+ nvmem_cfg.size = 8;
+ nvmem_cfg.priv = (void *)TWL_MODULE_SECURED_REG;
+ devm_rtc_nvmem_register(twl_rtc->rtc, &nvmem_cfg);
+ }
+
return 0;
}
--
2.32.0
