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path: root/drivers/soc/imx/soc-imx8.c
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Diffstat (limited to 'drivers/soc/imx/soc-imx8.c')
-rw-r--r--drivers/soc/imx/soc-imx8.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index f924ae8c6514..b9831576dd25 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -16,6 +16,9 @@
#define IMX8MQ_SW_INFO_B1 0x40
#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
+#define OCOTP_UID_LOW 0x410
+#define OCOTP_UID_HIGH 0x420
+
/* Same as ANADIG_DIGPROG_IMX7D */
#define ANADIG_DIGPROG_IMX8MM 0x800
@@ -24,6 +27,16 @@ struct imx8_soc_data {
u32 (*soc_revision)(void);
};
+static u64 soc_uid;
+
+static ssize_t soc_uid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%016llX\n", soc_uid);
+}
+
+static DEVICE_ATTR_RO(soc_uid);
+
static u32 __init imx8mq_soc_revision(void)
{
struct device_node *np;
@@ -42,6 +55,10 @@ static u32 __init imx8mq_soc_revision(void)
if (magic == IMX8MQ_SW_MAGIC_B1)
rev = REV_B1;
+ soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
+ soc_uid <<= 32;
+ soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
+
iounmap(ocotp_base);
out:
@@ -49,6 +66,26 @@ out:
return rev;
}
+static void __init imx8mm_soc_uid(void)
+{
+ void __iomem *ocotp_base;
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
+ if (!np)
+ return;
+
+ ocotp_base = of_iomap(np, 0);
+ WARN_ON(!ocotp_base);
+
+ soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
+ soc_uid <<= 32;
+ soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
+
+ iounmap(ocotp_base);
+ of_node_put(np);
+}
+
static u32 __init imx8mm_soc_revision(void)
{
struct device_node *np;
@@ -66,6 +103,9 @@ static u32 __init imx8mm_soc_revision(void)
iounmap(anatop_base);
of_node_put(np);
+
+ imx8mm_soc_uid();
+
return rev;
}
@@ -140,6 +180,11 @@ static int __init imx8_soc_init(void)
goto free_rev;
}
+ ret = device_create_file(soc_device_to_device(soc_dev),
+ &dev_attr_soc_uid);
+ if (ret)
+ goto free_rev;
+
if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);