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// SPDX-License-Identifier: GPL-2.0
/*
* TI K3 SoC info driver
*
* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
*/
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/sys_soc.h>
#define CTRLMMR_WKUP_JTAGID_REG 0
/*
* Bits:
* 31-28 VARIANT Device variant
* 27-12 PARTNO Part number
* 11-1 MFG Indicates TI as manufacturer (0x17)
* 1 Always 1
*/
#define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28)
#define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28)
#define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT (12)
#define CTRLMMR_WKUP_JTAGID_PARTNO_MASK GENMASK(27, 12)
#define CTRLMMR_WKUP_JTAGID_MFG_SHIFT (1)
#define CTRLMMR_WKUP_JTAGID_MFG_MASK GENMASK(11, 1)
#define CTRLMMR_WKUP_JTAGID_MFG_TI 0x17
static const struct k3_soc_id {
unsigned int id;
const char *family_name;
} k3_soc_ids[] = {
{ 0xBB5A, "AM65X" },
{ 0xBB64, "J721E" },
};
static int
k3_chipinfo_partno_to_names(unsigned int partno,
struct soc_device_attribute *soc_dev_attr)
{
int i;
for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
if (partno == k3_soc_ids[i].id) {
soc_dev_attr->family = k3_soc_ids[i].family_name;
return 0;
}
return -EINVAL;
}
static int k3_chipinfo_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct soc_device_attribute *soc_dev_attr;
struct device *dev = &pdev->dev;
struct soc_device *soc_dev;
struct regmap *regmap;
u32 partno_id;
u32 variant;
u32 jtag_id;
u32 mfg;
int ret;
regmap = device_node_to_regmap(node);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
if (ret < 0)
return ret;
mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
dev_err(dev, "Invalid MFG SoC\n");
return -ENODEV;
}
variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
variant++;
partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
if (!soc_dev_attr->revision) {
ret = -ENOMEM;
goto err;
}
ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
if (ret) {
dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
ret = -ENODEV;
goto err_free_rev;
}
node = of_find_node_by_path("/");
of_property_read_string(node, "model", &soc_dev_attr->machine);
of_node_put(node);
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
ret = PTR_ERR(soc_dev);
goto err_free_rev;
}
dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
soc_dev_attr->family,
soc_dev_attr->revision, jtag_id);
return 0;
err_free_rev:
kfree(soc_dev_attr->revision);
err:
kfree(soc_dev_attr);
return ret;
}
static const struct of_device_id k3_chipinfo_of_match[] = {
{ .compatible = "ti,am654-chipid", },
{ /* sentinel */ },
};
static struct platform_driver k3_chipinfo_driver = {
.driver = {
.name = "k3-chipinfo",
.of_match_table = k3_chipinfo_of_match,
},
.probe = k3_chipinfo_probe,
};
static int __init k3_chipinfo_init(void)
{
return platform_driver_register(&k3_chipinfo_driver);
}
subsys_initcall(k3_chipinfo_init);
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