155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* TI K3 SoC info driver
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*
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* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/sys_soc.h>
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#define CTRLMMR_WKUP_JTAGID_REG 0
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/*
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* Bits:
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* 31-28 VARIANT Device variant
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* 27-12 PARTNO Part number
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* 11-1 MFG Indicates TI as manufacturer (0x17)
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* 1 Always 1
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*/
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#define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28)
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#define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28)
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#define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT (12)
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#define CTRLMMR_WKUP_JTAGID_PARTNO_MASK GENMASK(27, 12)
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#define CTRLMMR_WKUP_JTAGID_MFG_SHIFT (1)
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#define CTRLMMR_WKUP_JTAGID_MFG_MASK GENMASK(11, 1)
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#define CTRLMMR_WKUP_JTAGID_MFG_TI 0x17
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static const struct k3_soc_id {
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unsigned int id;
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const char *family_name;
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} k3_soc_ids[] = {
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{ 0xBB5A, "AM65X" },
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{ 0xBB64, "J721E" },
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{ 0xBB6D, "J7200" },
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{ 0xBB38, "AM64X" }
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};
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static int
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k3_chipinfo_partno_to_names(unsigned int partno,
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struct soc_device_attribute *soc_dev_attr)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
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if (partno == k3_soc_ids[i].id) {
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soc_dev_attr->family = k3_soc_ids[i].family_name;
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return 0;
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}
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return -EINVAL;
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}
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static int k3_chipinfo_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct soc_device_attribute *soc_dev_attr;
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struct device *dev = &pdev->dev;
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struct soc_device *soc_dev;
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struct regmap *regmap;
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u32 partno_id;
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u32 variant;
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u32 jtag_id;
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u32 mfg;
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int ret;
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regmap = device_node_to_regmap(node);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
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if (ret < 0)
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return ret;
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mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
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CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
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if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
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dev_err(dev, "Invalid MFG SoC\n");
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return -ENODEV;
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}
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variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
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CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
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variant++;
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partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
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CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
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if (!soc_dev_attr->revision) {
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ret = -ENOMEM;
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goto err;
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}
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ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
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if (ret) {
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dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
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ret = -ENODEV;
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goto err_free_rev;
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}
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node = of_find_node_by_path("/");
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of_property_read_string(node, "model", &soc_dev_attr->machine);
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of_node_put(node);
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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 err_free_rev;
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}
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dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
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soc_dev_attr->family,
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soc_dev_attr->revision, jtag_id);
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return 0;
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err_free_rev:
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kfree(soc_dev_attr->revision);
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err:
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kfree(soc_dev_attr);
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return ret;
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}
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static const struct of_device_id k3_chipinfo_of_match[] = {
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{ .compatible = "ti,am654-chipid", },
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{ /* sentinel */ },
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};
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static struct platform_driver k3_chipinfo_driver = {
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.driver = {
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.name = "k3-chipinfo",
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.of_match_table = k3_chipinfo_of_match,
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},
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.probe = k3_chipinfo_probe,
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};
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static int __init k3_chipinfo_init(void)
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{
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return platform_driver_register(&k3_chipinfo_driver);
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}
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subsys_initcall(k3_chipinfo_init);
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