linux-kernel - [PATCH] soc: imx8mp: support 128 bits UID

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Message-Id: <20231008083808.1517132-1-peng.fan@oss.nxp.com>
Date:   Sun,  8 Oct 2023 16:38:08 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: [PATCH] soc: imx8mp: support 128 bits UID

From: Peng Fan <peng.fan@....com>

Current driver only supports 64bits UID for i.MX8MP, but
i.MX8MP UID is actually 128bits, the high 64bits is at 0xE00.
So update driver to support it.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/soc/imx/soc-imx8m.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
index ec87d9d878f3..5dcc227d41c0 100644
--- a/drivers/soc/imx/soc-imx8m.c
+++ b/drivers/soc/imx/soc-imx8m.c
@@ -24,6 +24,7 @@
 #define OCOTP_UID_HIGH			0x420
 
 #define IMX8MP_OCOTP_UID_OFFSET		0x10
+#define IMX8MP_OCOTP_UID_HIGH		0xE00
 
 /* Same as ANADIG_DIGPROG_IMX7D */
 #define ANADIG_DIGPROG_IMX8MM	0x800
@@ -34,6 +35,7 @@ struct imx8_soc_data {
 };
 
 static u64 soc_uid;
+static u64 soc_uid_h;
 
 #ifdef CONFIG_HAVE_ARM_SMCCC
 static u32 imx8mq_soc_revision_from_atf(void)
@@ -122,8 +124,15 @@ static void __init imx8mm_soc_uid(void)
 	soc_uid <<= 32;
 	soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW + offset);
 
+	if (offset) {
+		soc_uid_h = readl_relaxed(ocotp_base + IMX8MP_OCOTP_UID_HIGH + 0x10);
+		soc_uid_h <<= 32;
+		soc_uid_h |= readl_relaxed(ocotp_base + IMX8MP_OCOTP_UID_HIGH);
+	}
+
 	clk_disable_unprepare(clk);
 	clk_put(clk);
+
 	iounmap(ocotp_base);
 	of_node_put(np);
 }
@@ -222,7 +231,12 @@ static int __init imx8_soc_init(void)
 		goto free_soc;
 	}
 
-	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
+	if (soc_uid_h) {
+		soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX%016llX",
+							soc_uid_h, soc_uid);
+	} else {
+		soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
+	}
 	if (!soc_dev_attr->serial_number) {
 		ret = -ENOMEM;
 		goto free_rev;
-- 
2.37.1