3 files changed, 186 insertions, 0 deletions

diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
index 22acf064531f..ef0b8f6c53e0 100644
--- a/drivers/soc/amlogic/Kconfig
+++ b/drivers/soc/amlogic/Kconfig
@@ -9,4 +9,14 @@ config MESON_GX_SOCINFO
 	  Say yes to support decoding of Amlogic Meson GX SoC family
 	  information about the type, package and version.
 
+config MESON_MX_SOCINFO
+	bool "Amlogic Meson MX SoC Information driver"
+	depends on ARCH_MESON || COMPILE_TEST
+	default ARCH_MESON
+	select SOC_BUS
+	help
+	  Say yes to support decoding of Amlogic Meson6, Meson8,
+	  Meson8b and Meson8m2 SoC family information about the type
+	  and version.
+
 endmenu
diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
index 3e85fc462c21..1f5df50ebd73 100644
--- a/drivers/soc/amlogic/Makefile
+++ b/drivers/soc/amlogic/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
+obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
diff --git a/drivers/soc/amlogic/meson-mx-socinfo.c b/drivers/soc/amlogic/meson-mx-socinfo.c
new file mode 100644
index 000000000000..7bfff5ff22a2
--- /dev/null
+++ b/drivers/soc/amlogic/meson-mx-socinfo.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+#include <linux/bitfield.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define MESON_SOCINFO_MAJOR_VER_MESON6		0x16
+#define MESON_SOCINFO_MAJOR_VER_MESON8		0x19
+#define MESON_SOCINFO_MAJOR_VER_MESON8B		0x1b
+
+#define MESON_MX_ASSIST_HW_REV			0x14c
+
+#define MESON_MX_ANALOG_TOP_METAL_REVISION	0x0
+
+#define MESON_MX_BOOTROM_MISC_VER		0x4
+
+static const char *meson_mx_socinfo_revision(unsigned int major_ver,
+					     unsigned int misc_ver,
+					     unsigned int metal_rev)
+{
+	unsigned int minor_ver;
+
+	switch (major_ver) {
+	case MESON_SOCINFO_MAJOR_VER_MESON6:
+		minor_ver = 0xa;
+		break;
+
+	case MESON_SOCINFO_MAJOR_VER_MESON8:
+		if (metal_rev == 0x11111112)
+			major_ver = 0x1d;
+
+		if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
+			minor_ver = 0xa;
+		else if (metal_rev == 0x11111113)
+			minor_ver = 0xb;
+		else if (metal_rev == 0x11111133)
+			minor_ver = 0xc;
+		else
+			minor_ver = 0xd;
+
+		break;
+
+	case MESON_SOCINFO_MAJOR_VER_MESON8B:
+		if (metal_rev == 0x11111111)
+			minor_ver = 0xa;
+		else
+			minor_ver = 0xb;
+
+		break;
+
+	default:
+		minor_ver = 0x0;
+		break;
+	}
+
+	return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
+			 misc_ver);
+}
+
+static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
+					   unsigned int metal_rev)
+{
+	const char *soc_id;
+
+	switch (major_ver) {
+	case MESON_SOCINFO_MAJOR_VER_MESON6:
+		soc_id = "Meson6 (AML8726-MX)";
+		break;
+
+	case MESON_SOCINFO_MAJOR_VER_MESON8:
+		if (metal_rev == 0x11111112)
+			soc_id = "Meson8m2 (S812)";
+		else
+			soc_id = "Meson8 (S802)";
+
+		break;
+
+	case MESON_SOCINFO_MAJOR_VER_MESON8B:
+		soc_id = "Meson8b (S805)";
+		break;
+
+	default:
+		soc_id = "Unknown";
+		break;
+	}
+
+	return kstrdup_const(soc_id, GFP_KERNEL);
+}
+
+static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
+	{ .compatible = "amlogic,meson8-analog-top", },
+	{ .compatible = "amlogic,meson8b-analog-top", },
+	{ /* sentinel */ }
+};
+
+int __init meson_mx_socinfo_init(void)
+{
+	struct soc_device_attribute *soc_dev_attr;
+	struct soc_device *soc_dev;
+	struct device_node *np;
+	struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
+	unsigned int major_ver, misc_ver, metal_rev = 0;
+	int ret;
+
+	assist_regmap =
+		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
+	if (IS_ERR(assist_regmap))
+		return PTR_ERR(assist_regmap);
+
+	bootrom_regmap =
+		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
+	if (IS_ERR(bootrom_regmap))
+		return PTR_ERR(bootrom_regmap);
+
+	np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
+	if (np) {
+		analog_top_regmap = syscon_node_to_regmap(np);
+		if (IS_ERR(analog_top_regmap))
+			return PTR_ERR(analog_top_regmap);
+
+		ret = regmap_read(analog_top_regmap,
+				  MESON_MX_ANALOG_TOP_METAL_REVISION,
+				  &metal_rev);
+		if (ret)
+			return ret;
+	}
+
+	ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
+			  &misc_ver);
+	if (ret < 0)
+		return ret;
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return -ENODEV;
+
+	soc_dev_attr->family = "Amlogic Meson";
+
+	np = of_find_node_by_path("/");
+	of_property_read_string(np, "model", &soc_dev_attr->machine);
+	of_node_put(np);
+
+	soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
+							   metal_rev);
+	soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
+
+	soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR(soc_dev)) {
+		kfree_const(soc_dev_attr->revision);
+		kfree_const(soc_dev_attr->soc_id);
+		kfree(soc_dev_attr);
+		return PTR_ERR(soc_dev);
+	}
+
+	dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
+		 soc_dev_attr->soc_id, soc_dev_attr->revision);
+
+	return 0;
+}
+device_initcall(meson_mx_socinfo_init);