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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/arm-smccc.h>
#include <linux/of.h>
#define REV_B1 0x21
#define IMX8MQ_SW_INFO_B1 0x40
#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
#define IMX_SIP_GET_SOC_INFO 0xc2000006
#define OCOTP_UID_LOW 0x410
#define OCOTP_UID_HIGH 0x420
/* Same as ANADIG_DIGPROG_IMX7D */
#define ANADIG_DIGPROG_IMX8MM 0x800
struct imx8_soc_data {
char *name;
u32 (*soc_revision)(void);
};
static u64 soc_uid;
#ifdef CONFIG_HAVE_ARM_SMCCC
static u32 imx8mq_soc_revision_from_atf(void)
{
struct arm_smccc_res res;
arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res);
if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
return 0;
else
return res.a0 & 0xff;
}
#else
static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; };
#endif
static u32 __init imx8mq_soc_revision(void)
{
struct device_node *np;
void __iomem *ocotp_base;
u32 magic;
u32 rev = 0;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
if (!np)
goto out;
ocotp_base = of_iomap(np, 0);
WARN_ON(!ocotp_base);
/*
* SOC revision on older imx8mq is not available in fuses so query
* the value from ATF instead.
*/
rev = imx8mq_soc_revision_from_atf();
if (!rev) {
magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
if (magic == IMX8MQ_SW_MAGIC_B1)
rev = REV_B1;
}
soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
soc_uid <<= 32;
soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
iounmap(ocotp_base);
out:
of_node_put(np);
return rev;
}
static void __init imx8mm_soc_uid(void)
{
void __iomem *ocotp_base;
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
if (!np)
return;
ocotp_base = of_iomap(np, 0);
WARN_ON(!ocotp_base);
soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
soc_uid <<= 32;
soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
iounmap(ocotp_base);
of_node_put(np);
}
static u32 __init imx8mm_soc_revision(void)
{
struct device_node *np;
void __iomem *anatop_base;
u32 rev;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
if (!np)
return 0;
anatop_base = of_iomap(np, 0);
WARN_ON(!anatop_base);
rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);
iounmap(anatop_base);
of_node_put(np);
imx8mm_soc_uid();
return rev;
}
static const struct imx8_soc_data imx8mq_soc_data = {
.name = "i.MX8MQ",
.soc_revision = imx8mq_soc_revision,
};
static const struct imx8_soc_data imx8mm_soc_data = {
.name = "i.MX8MM",
.soc_revision = imx8mm_soc_revision,
};
static const struct imx8_soc_data imx8mn_soc_data = {
.name = "i.MX8MN",
.soc_revision = imx8mm_soc_revision,
};
static const struct imx8_soc_data imx8mp_soc_data = {
.name = "i.MX8MP",
.soc_revision = imx8mm_soc_revision,
};
static const struct of_device_id imx8_soc_match[] = {
{ .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
{ .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, },
{ .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, },
{ .compatible = "fsl,imx8mp", .data = &imx8mp_soc_data, },
{ }
};
#define imx8_revision(soc_rev) \
soc_rev ? \
kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
"unknown"
static int __init imx8_soc_init(void)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
const struct of_device_id *id;
u32 soc_rev = 0;
const struct imx8_soc_data *data;
int ret;
soc_dev_attr = kzalloc(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)
goto free_soc;
id = of_match_node(imx8_soc_match, of_root);
if (!id) {
ret = -ENODEV;
goto free_soc;
}
data = id->data;
if (data) {
soc_dev_attr->soc_id = data->name;
if (data->soc_revision)
soc_rev = data->soc_revision();
}
soc_dev_attr->revision = imx8_revision(soc_rev);
if (!soc_dev_attr->revision) {
ret = -ENOMEM;
goto free_soc;
}
soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
if (!soc_dev_attr->serial_number) {
ret = -ENOMEM;
goto free_rev;
}
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
ret = PTR_ERR(soc_dev);
goto free_serial_number;
}
pr_info("SoC: %s revision %s\n", soc_dev_attr->soc_id,
soc_dev_attr->revision);
if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
return 0;
free_serial_number:
kfree(soc_dev_attr->serial_number);
free_rev:
if (strcmp(soc_dev_attr->revision, "unknown"))
kfree(soc_dev_attr->revision);
free_soc:
kfree(soc_dev_attr);
return ret;
}
device_initcall(imx8_soc_init);
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