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Message-Id: <20190626070706.24930-1-Anson.Huang@nxp.com>
Date: Wed, 26 Jun 2019 15:07:06 +0800
From: Anson.Huang@....com
To: shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
festevam@...il.com, aisheng.dong@....com, abel.vesa@....com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Linux-imx@....com
Subject: [PATCH] soc: imx-scu: Add SoC UID(unique identifier) support
From: Anson Huang <Anson.Huang@....com>
Add i.MX SCU SoC's UID(unique identifier) support, user
can read it from sysfs:
root@...8qxpmek:~# cat /sys/devices/soc0/soc_uid
7B64280B57AC1898
Signed-off-by: Anson Huang <Anson.Huang@....com>
---
drivers/soc/imx/soc-imx-scu.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/soc/imx/soc-imx-scu.c b/drivers/soc/imx/soc-imx-scu.c
index 676f612..8d322a1 100644
--- a/drivers/soc/imx/soc-imx-scu.c
+++ b/drivers/soc/imx/soc-imx-scu.c
@@ -27,6 +27,36 @@ struct imx_sc_msg_misc_get_soc_id {
} data;
} __packed;
+struct imx_sc_msg_misc_get_soc_uid {
+ struct imx_sc_rpc_msg hdr;
+ u32 uid_low;
+ u32 uid_high;
+} __packed;
+
+static ssize_t soc_uid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct imx_sc_msg_misc_get_soc_uid msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ u64 soc_uid;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
+ hdr->size = 1;
+
+ /* the return value of SCU FW is in correct, skip return value check */
+ imx_scu_call_rpc(soc_ipc_handle, &msg, true);
+
+ soc_uid = msg.uid_high;
+ soc_uid <<= 32;
+ soc_uid |= msg.uid_low;
+
+ return sprintf(buf, "%016llX\n", soc_uid);
+}
+
+static DEVICE_ATTR_RO(soc_uid);
+
static int imx_scu_soc_id(void)
{
struct imx_sc_msg_misc_get_soc_id msg;
@@ -102,6 +132,11 @@ static int imx_scu_soc_probe(struct platform_device *pdev)
goto free_revision;
}
+ ret = device_create_file(soc_device_to_device(soc_dev),
+ &dev_attr_soc_uid);
+ if (ret)
+ goto free_revision;
+
return 0;
free_revision:
--
2.7.4
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