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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright 2019 NXP.
- */
- #include <dt-bindings/firmware/imx/rsrc.h>
- #include <linux/firmware/imx/sci.h>
- #include <linux/slab.h>
- #include <linux/sys_soc.h>
- #include <linux/platform_device.h>
- #include <linux/of.h>
- #define IMX_SCU_SOC_DRIVER_NAME "imx-scu-soc"
- static struct imx_sc_ipc *soc_ipc_handle;
- struct imx_sc_msg_misc_get_soc_id {
- struct imx_sc_rpc_msg hdr;
- union {
- struct {
- u32 control;
- u16 resource;
- } __packed req;
- struct {
- u32 id;
- } resp;
- } data;
- } __packed __aligned(4);
- 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;
- int ret;
- hdr->ver = IMX_SC_RPC_VERSION;
- hdr->svc = IMX_SC_RPC_SVC_MISC;
- hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
- hdr->size = 1;
- ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
- if (ret) {
- pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
- return ret;
- }
- 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;
- struct imx_sc_rpc_msg *hdr = &msg.hdr;
- int ret;
- hdr->ver = IMX_SC_RPC_VERSION;
- hdr->svc = IMX_SC_RPC_SVC_MISC;
- hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
- hdr->size = 3;
- msg.data.req.control = IMX_SC_C_ID;
- msg.data.req.resource = IMX_SC_R_SYSTEM;
- ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
- if (ret) {
- pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
- return ret;
- }
- return msg.data.resp.id;
- }
- static int imx_scu_soc_probe(struct platform_device *pdev)
- {
- struct soc_device_attribute *soc_dev_attr;
- struct soc_device *soc_dev;
- int id, ret;
- u32 val;
- ret = imx_scu_get_handle(&soc_ipc_handle);
- if (ret)
- return ret;
- soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
- GFP_KERNEL);
- if (!soc_dev_attr)
- return -ENOMEM;
- soc_dev_attr->family = "Freescale i.MX";
- ret = of_property_read_string(of_root,
- "model",
- &soc_dev_attr->machine);
- if (ret)
- return ret;
- id = imx_scu_soc_id();
- if (id < 0)
- return -EINVAL;
- /* format soc_id value passed from SCU firmware */
- val = id & 0x1f;
- soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
- if (!soc_dev_attr->soc_id)
- return -ENOMEM;
- /* format revision value passed from SCU firmware */
- val = (id >> 5) & 0xf;
- val = (((val >> 2) + 1) << 4) | (val & 0x3);
- soc_dev_attr->revision = kasprintf(GFP_KERNEL,
- "%d.%d",
- (val >> 4) & 0xf,
- val & 0xf);
- if (!soc_dev_attr->revision) {
- ret = -ENOMEM;
- goto free_soc_id;
- }
- soc_dev = soc_device_register(soc_dev_attr);
- if (IS_ERR(soc_dev)) {
- ret = PTR_ERR(soc_dev);
- 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:
- kfree(soc_dev_attr->revision);
- free_soc_id:
- kfree(soc_dev_attr->soc_id);
- return ret;
- }
- static struct platform_driver imx_scu_soc_driver = {
- .driver = {
- .name = IMX_SCU_SOC_DRIVER_NAME,
- },
- .probe = imx_scu_soc_probe,
- };
- static int __init imx_scu_soc_init(void)
- {
- struct platform_device *pdev;
- struct device_node *np;
- int ret;
- np = of_find_compatible_node(NULL, NULL, "fsl,imx-scu");
- if (!np)
- return -ENODEV;
- of_node_put(np);
- ret = platform_driver_register(&imx_scu_soc_driver);
- if (ret)
- return ret;
- pdev = platform_device_register_simple(IMX_SCU_SOC_DRIVER_NAME,
- -1, NULL, 0);
- if (IS_ERR(pdev))
- platform_driver_unregister(&imx_scu_soc_driver);
- return PTR_ERR_OR_ZERO(pdev);
- }
- device_initcall(imx_scu_soc_init);
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