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Add i.MX SCU SoC's UID(unique identifier) support, user can read it from sysfs: root@imx8qxpmek:~# cat /sys/devices/soc0/soc_uid 7B64280B57AC1898 Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
184 lines
3.8 KiB
C
184 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 NXP.
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*/
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#include <dt-bindings/firmware/imx/rsrc.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#define IMX_SCU_SOC_DRIVER_NAME "imx-scu-soc"
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static struct imx_sc_ipc *soc_ipc_handle;
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struct imx_sc_msg_misc_get_soc_id {
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struct imx_sc_rpc_msg hdr;
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union {
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struct {
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u32 control;
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u16 resource;
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} __packed req;
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struct {
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u32 id;
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} resp;
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} data;
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} __packed;
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struct imx_sc_msg_misc_get_soc_uid {
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struct imx_sc_rpc_msg hdr;
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u32 uid_low;
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u32 uid_high;
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} __packed;
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static ssize_t soc_uid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct imx_sc_msg_misc_get_soc_uid msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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u64 soc_uid;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
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hdr->size = 1;
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ret = imx_scu_call_rpc(soc_ipc_handle, &msg, false);
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if (ret) {
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pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
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return ret;
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}
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soc_uid = msg.uid_high;
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soc_uid <<= 32;
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soc_uid |= msg.uid_low;
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return sprintf(buf, "%016llX\n", soc_uid);
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}
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static DEVICE_ATTR_RO(soc_uid);
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static int imx_scu_soc_id(void)
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{
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struct imx_sc_msg_misc_get_soc_id msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
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hdr->size = 3;
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msg.data.req.control = IMX_SC_C_ID;
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msg.data.req.resource = IMX_SC_R_SYSTEM;
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ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
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if (ret) {
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pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
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return ret;
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}
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return msg.data.resp.id;
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}
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static int imx_scu_soc_probe(struct platform_device *pdev)
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{
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struct soc_device_attribute *soc_dev_attr;
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struct soc_device *soc_dev;
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int id, ret;
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u32 val;
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ret = imx_scu_get_handle(&soc_ipc_handle);
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if (ret)
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return ret;
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soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
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GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->family = "Freescale i.MX";
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ret = of_property_read_string(of_root,
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"model",
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&soc_dev_attr->machine);
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if (ret)
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return ret;
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id = imx_scu_soc_id();
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if (id < 0)
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return -EINVAL;
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/* format soc_id value passed from SCU firmware */
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val = id & 0x1f;
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soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
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if (!soc_dev_attr->soc_id)
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return -ENOMEM;
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/* format revision value passed from SCU firmware */
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val = (id >> 5) & 0xf;
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val = (((val >> 2) + 1) << 4) | (val & 0x3);
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soc_dev_attr->revision = kasprintf(GFP_KERNEL,
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"%d.%d",
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(val >> 4) & 0xf,
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val & 0xf);
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if (!soc_dev_attr->revision) {
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ret = -ENOMEM;
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goto free_soc_id;
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}
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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ret = PTR_ERR(soc_dev);
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goto free_revision;
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}
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ret = device_create_file(soc_device_to_device(soc_dev),
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&dev_attr_soc_uid);
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if (ret)
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goto free_revision;
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return 0;
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free_revision:
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kfree(soc_dev_attr->revision);
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free_soc_id:
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kfree(soc_dev_attr->soc_id);
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return ret;
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}
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static struct platform_driver imx_scu_soc_driver = {
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.driver = {
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.name = IMX_SCU_SOC_DRIVER_NAME,
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},
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.probe = imx_scu_soc_probe,
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};
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static int __init imx_scu_soc_init(void)
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{
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struct platform_device *pdev;
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struct device_node *np;
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int ret;
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np = of_find_compatible_node(NULL, NULL, "fsl,imx-scu");
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if (!np)
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return -ENODEV;
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of_node_put(np);
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ret = platform_driver_register(&imx_scu_soc_driver);
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if (ret)
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return ret;
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pdev = platform_device_register_simple(IMX_SCU_SOC_DRIVER_NAME,
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-1, NULL, 0);
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if (IS_ERR(pdev))
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platform_driver_unregister(&imx_scu_soc_driver);
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return PTR_ERR_OR_ZERO(pdev);
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}
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device_initcall(imx_scu_soc_init);
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