[PATCH 3/4] mach-ux500: export System-on-Chip information ux500 via sysfs

[Lee Jones]

Here we make use of the new drivers/base/soc driver to export
vital SoC information out to userspace via sysfs. This patch
provides a data structure of strings to populate the base
nodes found in:

/sys/devices/soc/[1|2|3|...]/[family|machine|revision|soc_id].

It also adds one more node as requested by ST-Ericsson.

Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
 arch/arm/mach-ux500/Kconfig              |    1 +
 arch/arm/mach-ux500/id.c                 |  115 ++++++++++++++++++++++++++++++
 arch/arm/mach-ux500/include/mach/setup.h |    1 +
 3 files changed, 117 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index 4210cb4..4d2f2c2 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -26,6 +26,7 @@ config MACH_U8500
 	bool "U8500 Development platform"
 	depends on UX500_SOC_DB8500
 	select TPS6105X
+	select SYS_SOC
 	help
 	  Include support for the mop500 development platform.
 
diff --git a/arch/arm/mach-ux500/id.c b/arch/arm/mach-ux500/id.c
index d35122e..917d222 100644
--- a/arch/arm/mach-ux500/id.c
+++ b/arch/arm/mach-ux500/id.c
@@ -2,12 +2,17 @@
  * Copyright (C) ST-Ericsson SA 2010
  *
  * Author: Rabin Vincent <rabin.vincent at stericsson.com> for ST-Ericsson
+ * Author: Lee Jones <lee.jones at linaro.org> for ST-Ericsson
  * License terms: GNU General Public License (GPL) version 2
  */
 
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/sys_soc.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/platform_device.h>
 
 #include <asm/cputype.h>
 #include <asm/tlbflush.h>
@@ -105,3 +110,113 @@ void __init ux500_map_io(void)
 
 	ux500_print_soc_info(asicid);
 }
+
+#define U8500_BB_UID_BASE (U8500_BACKUPRAM1_BASE + 0xFC0)
+#define U8500_BB_UID_LENGTH 5
+
+struct device *soc_parent;
+
+static void ux500_get_machine(char *buf)
+{
+	sprintf(buf, "DB%4x", dbx500_partnumber());
+}
+
+static void ux500_get_family(char *buf)
+{
+	sprintf(buf, "Ux500");
+}
+
+static void ux500_get_soc_id(char *buf)
+{
+	void __iomem *uid_base;
+	int i;
+	ssize_t sz = 0;
+
+	if (dbx500_partnumber() == 0x8500) {
+		uid_base = __io_address(U8500_BB_UID_BASE);
+		for (i = 0; i < U8500_BB_UID_LENGTH; i++) {
+			sz += sprintf(buf + sz, "%08x", readl(uid_base + i * sizeof(u32)));
+		}
+		return;
+	} else {
+		/* Don't know where it is located for U5500 */
+		sprintf(buf, "N/A");
+		return;
+	}
+}
+
+static void ux500_get_revision(char *buf)
+{
+	unsigned int rev = dbx500_revision();
+
+	if (rev == 0x01) {
+		sprintf(buf, "%s", "ED");
+		return;
+	}
+	else if (rev >= 0xA0) {
+		sprintf(buf, "%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
+		return;
+	}
+
+	sprintf(buf, "%s", "Unknown");
+}
+
+static ssize_t ux500_get_process(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	if (dbx500_id.process == 0x00)
+		return sprintf(buf, "Standard\n");
+
+	return sprintf(buf, "%02xnm\n", dbx500_id.process);
+}
+
+static void soc_info_put(struct soc_device *soc_dev)
+{
+	char buf[1024];
+
+	ux500_get_machine(buf);
+	soc_dev->machine = kzalloc(strlen(buf), GFP_KERNEL);
+	strcpy((char *)soc_dev->machine, buf);
+
+	ux500_get_family(buf);
+	soc_dev->family = kzalloc(strlen(buf), GFP_KERNEL);
+	strcpy((char *)soc_dev->family, buf);
+
+	ux500_get_soc_id(buf);
+	soc_dev->soc_id = kzalloc(strlen(buf), GFP_KERNEL);
+	strcpy((char *)soc_dev->soc_id, buf);
+
+	ux500_get_revision(buf);
+	soc_dev->revision = kzalloc(strlen(buf), GFP_KERNEL);
+	strcpy((char *)soc_dev->revision, buf);
+}
+
+struct device_attribute ux500_soc_attrs[] = {
+	__ATTR(process,  S_IRUGO, ux500_get_process,  NULL),
+	__ATTR_NULL,
+};
+
+static int __init ux500_soc_sysfs_init(void)
+{
+	int ret;
+	int i = 0;
+	struct soc_device *soc_dev = kzalloc(sizeof(struct soc_device), GFP_KERNEL);
+
+	soc_parent = kzalloc(sizeof(struct device), GFP_KERNEL);
+
+	soc_info_put(soc_dev);
+
+	ret = soc_device_register(soc_parent, soc_dev);
+
+	if (ret >= 0) {
+		while (ux500_soc_attrs[i].attr.name != NULL) {
+			ret = device_create_file(soc_parent, &ux500_soc_attrs[i++]);
+			if (ret)
+				goto out;
+		}
+	}
+out:
+	return ret;
+}
+postcore_initcall(ux500_soc_sysfs_init);
diff --git a/arch/arm/mach-ux500/include/mach/setup.h b/arch/arm/mach-ux500/include/mach/setup.h
index a7d363f..a24093f 100644
--- a/arch/arm/mach-ux500/include/mach/setup.h
+++ b/arch/arm/mach-ux500/include/mach/setup.h
@@ -35,6 +35,7 @@ extern void __init amba_add_devices(struct amba_device *devs[], int num);
 
 struct sys_timer;
 extern struct sys_timer ux500_timer;
+extern struct device *soc_parent;
 
 #define __IO_DEV_DESC(x, sz)	{		\
 	.virtual	= IO_ADDRESS(x),	\
-- 
1.7.4.1