k3-socinfo.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * TI K3 SoC info driver
  4 *
  5 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
  6 */
  7
  8#include <linux/mfd/syscon.h>
  9#include <linux/of.h>
 10#include <linux/of_address.h>
 11#include <linux/regmap.h>
 12#include <linux/platform_device.h>
 13#include <linux/slab.h>
 14#include <linux/string.h>
 15#include <linux/sys_soc.h>
 16
 17#define CTRLMMR_WKUP_JTAGID_REG		0
 18/*
 19 * Bits:
 20 *  31-28 VARIANT	Device variant
 21 *  27-12 PARTNO	Part number
 22 *  11-1  MFG		Indicates TI as manufacturer (0x17)
 23 *  0			Always 1
 24 */
 25#define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT	(28)
 26#define CTRLMMR_WKUP_JTAGID_VARIANT_MASK	GENMASK(31, 28)
 27
 28#define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT	(12)
 29#define CTRLMMR_WKUP_JTAGID_PARTNO_MASK		GENMASK(27, 12)
 30
 31#define CTRLMMR_WKUP_JTAGID_MFG_SHIFT		(1)
 32#define CTRLMMR_WKUP_JTAGID_MFG_MASK		GENMASK(11, 1)
 33
 34#define CTRLMMR_WKUP_JTAGID_MFG_TI		0x17
 35
 36#define JTAG_ID_PARTNO_AM65X		0xBB5A
 37#define JTAG_ID_PARTNO_J721E		0xBB64
 38#define JTAG_ID_PARTNO_J7200		0xBB6D
 39#define JTAG_ID_PARTNO_AM64X		0xBB38
 40#define JTAG_ID_PARTNO_J721S2		0xBB75
 41#define JTAG_ID_PARTNO_AM62X		0xBB7E
 42#define JTAG_ID_PARTNO_J784S4		0xBB80
 43#define JTAG_ID_PARTNO_AM62AX		0xBB8D
 44#define JTAG_ID_PARTNO_AM62PX		0xBB9D
 45#define JTAG_ID_PARTNO_J722S		0xBBA0
 46#define JTAG_ID_PARTNO_AM62LX		0xBBA7
 47
 48static const struct k3_soc_id {
 49	unsigned int id;
 50	const char *family_name;
 51} k3_soc_ids[] = {
 52	{ JTAG_ID_PARTNO_AM65X, "AM65X" },
 53	{ JTAG_ID_PARTNO_J721E, "J721E" },
 54	{ JTAG_ID_PARTNO_J7200, "J7200" },
 55	{ JTAG_ID_PARTNO_AM64X, "AM64X" },
 56	{ JTAG_ID_PARTNO_J721S2, "J721S2"},
 57	{ JTAG_ID_PARTNO_AM62X, "AM62X" },
 58	{ JTAG_ID_PARTNO_J784S4, "J784S4" },
 59	{ JTAG_ID_PARTNO_AM62AX, "AM62AX" },
 60	{ JTAG_ID_PARTNO_AM62PX, "AM62PX" },
 61	{ JTAG_ID_PARTNO_J722S, "J722S" },
 62	{ JTAG_ID_PARTNO_AM62LX, "AM62LX" },
 63};
 64
 65static const char * const j721e_rev_string_map[] = {
 66	"1.0", "1.1", "2.0",
 67};
 68
 69static const char * const am62lx_rev_string_map[] = {
 70	"1.0", "1.1",
 71};
 72
 73static int
 74k3_chipinfo_partno_to_names(unsigned int partno,
 75			    struct soc_device_attribute *soc_dev_attr)
 76{
 77	int i;
 78
 79	for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
 80		if (partno == k3_soc_ids[i].id) {
 81			soc_dev_attr->family = k3_soc_ids[i].family_name;
 82			return 0;
 83		}
 84
 85	return -ENODEV;
 86}
 87
 88static int
 89k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant,
 90			  struct soc_device_attribute *soc_dev_attr)
 91{
 92	switch (partno) {
 93	case JTAG_ID_PARTNO_J721E:
 94		if (variant >= ARRAY_SIZE(j721e_rev_string_map))
 95			goto err_unknown_variant;
 96		soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s",
 97						   j721e_rev_string_map[variant]);
 98		break;
 99	case JTAG_ID_PARTNO_AM62LX:
100		if (variant >= ARRAY_SIZE(am62lx_rev_string_map))
101			goto err_unknown_variant;
102		soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s",
103						   am62lx_rev_string_map[variant]);
104		break;
105	default:
106		variant++;
107		soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0",
108						   variant);
109	}
110
111	if (!soc_dev_attr->revision)
112		return -ENOMEM;
113
114	return 0;
115
116err_unknown_variant:
117	return -ENODEV;
118}
119
120static const struct regmap_config k3_chipinfo_regmap_cfg = {
121	.reg_bits = 32,
122	.val_bits = 32,
123	.reg_stride = 4,
124};
125
126static int k3_chipinfo_probe(struct platform_device *pdev)
127{
128	struct device_node *node = pdev->dev.of_node;
129	struct soc_device_attribute *soc_dev_attr;
130	struct device *dev = &pdev->dev;
131	struct soc_device *soc_dev;
132	struct regmap *regmap;
133	void __iomem *base;
134	u32 partno_id;
135	u32 variant;
136	u32 jtag_id;
137	u32 mfg;
138	int ret;
139
140	base = devm_platform_ioremap_resource(pdev, 0);
141	if (IS_ERR(base))
142		return PTR_ERR(base);
143
144	regmap = devm_regmap_init_mmio(dev, base, &k3_chipinfo_regmap_cfg);
145	if (IS_ERR(regmap))
146		return PTR_ERR(regmap);
147
148	ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
149	if (ret < 0)
150		return ret;
151
152	mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
153	       CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
154
155	if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
156		dev_err(dev, "Invalid MFG SoC\n");
157		return -ENODEV;
158	}
159
160	variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
161		  CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
162
163	partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
164		 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
165
166	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
167	if (!soc_dev_attr)
168		return -ENOMEM;
169
170	ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
171	if (ret) {
172		dev_err(dev, "Unknown SoC JTAGID[0x%08X]: %d\n", jtag_id, ret);
173		goto err;
174	}
175
176	ret = k3_chipinfo_variant_to_sr(partno_id, variant, soc_dev_attr);
177	if (ret) {
178		dev_err(dev, "Unknown SoC SR[0x%08X]: %d\n", jtag_id, ret);
179		goto err;
180	}
181
182	node = of_find_node_by_path("/");
183	of_property_read_string(node, "model", &soc_dev_attr->machine);
184	of_node_put(node);
185
186	soc_dev = soc_device_register(soc_dev_attr);
187	if (IS_ERR(soc_dev)) {
188		ret = PTR_ERR(soc_dev);
189		goto err_free_rev;
190	}
191
192	dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
193		 soc_dev_attr->family,
194		 soc_dev_attr->revision, jtag_id);
195
196	return 0;
197
198err_free_rev:
199	kfree(soc_dev_attr->revision);
200err:
201	kfree(soc_dev_attr);
202	return ret;
203}
204
205static const struct of_device_id k3_chipinfo_of_match[] = {
206	{ .compatible = "ti,am654-chipid", },
207	{ /* sentinel */ },
208};
209
210static struct platform_driver k3_chipinfo_driver = {
211	.driver = {
212		.name = "k3-chipinfo",
213		.of_match_table = k3_chipinfo_of_match,
214	},
215	.probe = k3_chipinfo_probe,
216};
217
218static int __init k3_chipinfo_init(void)
219{
220	return platform_driver_register(&k3_chipinfo_driver);
221}
222subsys_initcall(k3_chipinfo_init);