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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;
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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