@@ -91,6 +91,16 @@ config TI_K3_RINGACC
and a consumer. There is one RINGACC module per NAVSS on TI AM65x SoCs
If unsure, say N.
+config TI_K3_SOCINFO
+ bool
+ depends on ARCH_K3 || COMPILE_TEST
+ select SOC_BUS
+ select MFD_SYSCON
+ help
+ Include support for the SoC bus socinfo for the TI K3 Multicore SoC
+ platforms to provide information about the SoC family and
+ variant to user space.
+
endif # SOC_TI
config TI_SCI_INTA_MSI_DOMAIN
@@ -11,3 +11,4 @@ obj-$(CONFIG_WKUP_M3_IPC) += wkup_m3_ipc.o
obj-$(CONFIG_TI_SCI_PM_DOMAINS) += ti_sci_pm_domains.o
obj-$(CONFIG_TI_SCI_INTA_MSI_DOMAIN) += ti_sci_inta_msi.o
obj-$(CONFIG_TI_K3_RINGACC) += k3-ringacc.o
+obj-$(CONFIG_TI_K3_SOCINFO) += k3-socinfo.o
new file mode 100644
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI K3 SoC info driver
+ *
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.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 __init 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 __init k3_chipinfo_init(void)
+{
+ struct soc_device_attribute *soc_dev_attr;
+ struct soc_device *soc_dev;
+ struct device_node *node;
+ struct regmap *regmap;
+ u32 jtag_id;
+ u32 partno_id;
+ u32 variant;
+ u32 mfg;
+ int ret;
+
+ node = of_find_compatible_node(NULL, NULL, "ti,am654-chipid");
+ if (!node)
+ return -ENODEV;
+
+ regmap = device_node_to_regmap(node);
+ of_node_put(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) {
+ pr_err("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);
+
+ ret = partno_to_names(partno_id, soc_dev_attr);
+ if (ret) {
+ pr_err("Unknown SoC JTAGID[0x%08X]\n", jtag_id);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ 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;
+ }
+
+ pr_debug("Family:%s rev:%s JTAGID[0x%08x] Detected\n",
+ soc_dev_attr->family,
+ soc_dev_attr->revision, jtag_id);
+
+ return 0;
+
+err:
+ kfree(soc_dev_attr->revision);
+ kfree(soc_dev_attr);
+ return ret;
+}
+
+subsys_initcall(k3_chipinfo_init);
The Texas Instruments K3 Multicore SoC platforms have chipid module which is represented by CTRLMMR_xxx_JTAGID register and contains information about SoC id and revision. Bits: 31-28 VARIANT Device variant 27-12 PARTNO Part number 11-1 MFG Indicates TI as manufacturer (0x17) 1 Always 1 This patch adds corresponding driver to identify the TI K3 SoC family and revision, and registers this information with the SoC bus. It is available under /sys/devices/soc0/ for user space, and can be checked, where needed, in Kernel using soc_device_match(). Identification is done by: - checking MFG to be TI ID - retrieving Device variant (revision) - retrieving Part number and convert it to the family - retrieving machine from DT "/model" Example J721E: # cat /sys/devices/soc0/{machine,family,revision} Texas Instruments K3 J721E SoC J721E SR1.0 Example AM65x: # cat /sys/devices/soc0/{machine,family,revision} Texas Instruments AM654 Base Board AM65X SR1.0 Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> --- drivers/soc/ti/Kconfig | 10 +++ drivers/soc/ti/Makefile | 1 + drivers/soc/ti/k3-socinfo.c | 135 ++++++++++++++++++++++++++++++++++++ 3 files changed, 146 insertions(+) create mode 100644 drivers/soc/ti/k3-socinfo.c