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path: root/drivers/soc/ti/k3-socinfo.c
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Diffstat (limited to 'drivers/soc/ti/k3-socinfo.c')
-rw-r--r--drivers/soc/ti/k3-socinfo.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/soc/ti/k3-socinfo.c b/drivers/soc/ti/k3-socinfo.c
new file mode 100644
index 000000000000..af0ba5288e58
--- /dev/null
+++ b/drivers/soc/ti/k3-socinfo.c
@@ -0,0 +1,152 @@
+// 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);