[PATCH 1/3] soc: Add Amlogic SoC Information driver

[Neil Armstrong <narmstrong@baylibre.com>]

Amlogic SoCs have a SoC information register for SoC type, package type and
revision information.
This patchs adds support for this register decoding and exposing with the
SoC bus infrastructure.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/soc/Kconfig                    |   1 +
 drivers/soc/Makefile                   |   1 +
 drivers/soc/amlogic/Kconfig            |  12 +++
 drivers/soc/amlogic/Makefile           |   1 +
 drivers/soc/amlogic/meson-gx-socinfo.c | 158 +++++++++++++++++++++++++++++++++
 5 files changed, 173 insertions(+)
 create mode 100644 drivers/soc/amlogic/Kconfig
 create mode 100644 drivers/soc/amlogic/Makefile
 create mode 100644 drivers/soc/amlogic/meson-gx-socinfo.c

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index f09023f..0b149a6 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -1,5 +1,6 @@
 menu "SOC (System On Chip) specific Drivers"
 
+source "drivers/soc/amlogic/Kconfig"
 source "drivers/soc/bcm/Kconfig"
 source "drivers/soc/fsl/Kconfig"
 source "drivers/soc/mediatek/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 05eae52..4c0c776 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_DOVE)		+= dove/
 obj-$(CONFIG_MACH_DOVE)		+= dove/
 obj-y				+= fsl/
 obj-$(CONFIG_ARCH_MEDIATEK)	+= mediatek/
+obj-$(CONFIG_ARCH_MESON)	+= amlogic/
 obj-$(CONFIG_ARCH_QCOM)		+= qcom/
 obj-$(CONFIG_ARCH_RENESAS)	+= renesas/
 obj-$(CONFIG_ARCH_ROCKCHIP)	+= rockchip/
diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
new file mode 100644
index 0000000..22acf06
--- /dev/null
+++ b/drivers/soc/amlogic/Kconfig
@@ -0,0 +1,12 @@
+menu "Amlogic SoC drivers"
+
+config MESON_GX_SOCINFO
+	bool "Amlogic Meson GX SoC Information driver"
+	depends on ARCH_MESON || COMPILE_TEST
+	default ARCH_MESON
+	select SOC_BUS
+	help
+	  Say yes to support decoding of Amlogic Meson GX SoC family
+	  information about the type, package and version.
+
+endmenu
diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
new file mode 100644
index 0000000..3e85fc4
--- /dev/null
+++ b/drivers/soc/amlogic/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
diff --git a/drivers/soc/amlogic/meson-gx-socinfo.c b/drivers/soc/amlogic/meson-gx-socinfo.c
new file mode 100644
index 0000000..bfdc644
--- /dev/null
+++ b/drivers/soc/amlogic/meson-gx-socinfo.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2017 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.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>
+
+#define SOCINFO_MAJOR_SHIFT	24
+#define SOCINFO_MINOR_SHIFT	16
+#define SOCINFO_PACK_SHIFT	8
+#define SOCINFO_MISC_SHIFT	0
+#define SOCINFO_MASK		0xff
+
+static const struct meson_gx_soc_id {
+	const char *name;
+	unsigned int id;
+} soc_ids[] = {
+	{ "GXBB", 0x1f },
+	{ "GXTVBB", 0x20 },
+	{ "GXL", 0x21 },
+	{ "GXM", 0x22 },
+	{ "TXL", 0x23 },
+};
+
+static const struct meson_gx_package_id {
+	const char *name;
+	unsigned int major_id;
+	unsigned int pack_id;
+} soc_packages[] = {
+	{ "S905", 0x1f, 0 },
+	{ "S905M", 0x1f, 0x20 },
+	{ "S905D", 0x21, 0 },
+	{ "S905X", 0x21, 0x80 },
+	{ "S905L", 0x21, 0xc0 },
+	{ "S905M2", 0x21, 0xe0 },
+	{ "S912", 0x22, 0 },
+};
+
+static inline unsigned int socinfo_to_major(u32 socinfo)
+{
+	return (socinfo >> SOCINFO_MAJOR_SHIFT) & SOCINFO_MASK;
+}
+
+static inline unsigned int socinfo_to_minor(u32 socinfo)
+{
+	return (socinfo >> SOCINFO_MINOR_SHIFT) & SOCINFO_MASK;
+}
+
+static inline unsigned int socinfo_to_pack(u32 socinfo)
+{
+	return (socinfo >> SOCINFO_PACK_SHIFT) & SOCINFO_MASK;
+}
+
+static inline unsigned int socinfo_to_misc(u32 socinfo)
+{
+	return (socinfo >> SOCINFO_MISC_SHIFT) & SOCINFO_MASK;
+}
+
+static const char *socinfo_to_package_id(u32 socinfo)
+{
+	unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
+	unsigned int major = socinfo_to_major(socinfo);
+	int i;
+
+	for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
+		if (soc_packages[i].major_id == major &&
+		    soc_packages[i].pack_id == pack)
+			return soc_packages[i].name;
+	}
+
+	return "Unknown";
+}
+
+static const char *socinfo_to_soc_id(u32 socinfo)
+{
+	unsigned int id = socinfo_to_major(socinfo);
+	int i;
+
+	for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
+		if (soc_ids[i].id == id)
+			return soc_ids[i].name;
+	}
+
+	return "Unknown";
+}
+
+int __init meson_gx_socinfo_init(void)
+{
+	struct soc_device_attribute *soc_dev_attr;
+	void __iomem *meson_gx_socinfo_base;
+	struct soc_device *soc_dev;
+	struct device_node *root;
+	struct device_node *np;
+	struct device *dev;
+	u32 socinfo;
+
+	/* look up for socinfo node */
+	np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-socinfo");
+	if (!np)
+		return -ENODEV;
+
+	meson_gx_socinfo_base = of_iomap(np, 0);
+	of_node_put(np);
+
+	if (!meson_gx_socinfo_base) {
+		pr_err("%s: failed to map socinfo\n", np->name);
+		return -ENOMEM;
+	}
+
+	socinfo = readl_relaxed(meson_gx_socinfo_base);
+	iounmap(meson_gx_socinfo_base);
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return -ENODEV;
+
+	soc_dev_attr->family = "Amlogic Meson";
+
+	root = of_find_node_by_path("/");
+	of_property_read_string(root, "model", &soc_dev_attr->machine);
+	of_node_put(root);
+
+	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
+					   socinfo_to_major(socinfo),
+					   socinfo_to_minor(socinfo),
+					   socinfo_to_pack(socinfo),
+					   socinfo_to_misc(socinfo));
+	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
+					 socinfo_to_soc_id(socinfo),
+					 socinfo_to_package_id(socinfo));
+
+	soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR(soc_dev)) {
+		kfree(soc_dev_attr->revision);
+		kfree_const(soc_dev_attr->soc_id);
+		kfree(soc_dev_attr);
+		return PTR_ERR(soc_dev);
+	}
+	dev = soc_device_to_device(soc_dev);
+
+	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
+			soc_dev_attr->soc_id,
+			socinfo_to_major(socinfo),
+			socinfo_to_minor(socinfo),
+			socinfo_to_pack(socinfo),
+			socinfo_to_misc(socinfo));
+
+	return 0;
+}
+core_initcall(meson_gx_socinfo_init);
-- 
1.9.1