ux500: Export U8500 SoC info through sysfs

ST-Ericsson's U8500 implementation.
Register sysfs SoC interface, and exports:
	- Machine name
	- Family name
	- SoC ID
	- Silicon process
	- Silicon revision number.

ST-Ericsson ID: ER320976

Signed-off-by: Maxime COQUELIN <maxime.coquelin-nonst@stericsson.com>
Change-Id: I6fe672b2e096ee4e6bf37dfe83594f6672fa0079
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/18179
Reviewed-by: Linus WALLEIJ <linus.walleij@stericsson.com>
Signed-off-by: Philippe Langlais <philippe.langlais@linaro.org>

2 files changed, 68 insertions, 0 deletions

diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index 3c4720eaf47..b8308f5c35d 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -7,6 +7,7 @@ config UX500_SOC_COMMON
 	select HAS_MTU
 	select NOMADIK_GPIO
 	select ARM_ERRATA_753970
+	select SYS_SOC
 
 menu "Ux500 SoC"
 
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 41d0be21d2f..3b125a76091 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -18,6 +18,7 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/regulator/machine.h>
+#include <linux/sys_soc.h>
 
 #include <asm/mach/map.h>
 #include <asm/pmu.h>
@@ -402,3 +403,69 @@ void __init u8500_init_devices(void)
 
 	return ;
 }
+
+#ifdef CONFIG_SYS_SOC
+#define U8500_BB_UID_BASE (U8500_BACKUPRAM1_BASE + 0xFC0)
+#define U8500_BB_UID_LENGTH 5
+
+static ssize_t ux500_get_machine(char *buf, struct sysfs_soc_info *si)
+{
+	return sprintf(buf, "DB%2x00\n", dbx500_id.partnumber);
+}
+
+static ssize_t ux500_get_soc_id(char *buf, struct sysfs_soc_info *si)
+{
+	void __iomem *uid_base;
+	int i;
+	ssize_t sz = 0;
+
+	if (dbx500_id.partnumber == 0x85) {
+		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)));
+		sz += sprintf(buf + sz, "\n");
+	}
+	else {
+		/* Don't know where it is located for U5500 */
+		sz = sprintf(buf, "N/A\n");
+	}
+
+	return sz;
+}
+
+static ssize_t ux500_get_revision(char *buf, struct sysfs_soc_info *si)
+{
+	unsigned int rev = dbx500_id.revision;
+
+	if (rev == 0x01)
+		return sprintf(buf, "%s\n", "ED");
+	else if (rev >= 0xA0)
+		return sprintf(buf, "%d.%d\n" , (rev >> 4) - 0xA + 1, rev & 0xf);
+
+	return sprintf(buf, "%s", "Unknown\n");
+}
+
+static ssize_t ux500_get_process(char *buf, struct sysfs_soc_info *si)
+{
+	if (dbx500_id.process == 0x00)
+		return sprintf(buf, "Standard\n");
+
+	return sprintf(buf, "%02xnm\n", dbx500_id.process);
+}
+
+static struct sysfs_soc_info soc_info[] = {
+	SYSFS_SOC_ATTR_CALLBACK("machine", ux500_get_machine),
+	SYSFS_SOC_ATTR_VALUE("family", "Ux500"),
+	SYSFS_SOC_ATTR_CALLBACK("soc_id", ux500_get_soc_id),
+	SYSFS_SOC_ATTR_CALLBACK("revision", ux500_get_revision),
+	SYSFS_SOC_ATTR_CALLBACK("process", ux500_get_process),
+};
+
+static int __init ux500_sys_soc_init(void)
+{
+	return register_sysfs_soc(soc_info, ARRAY_SIZE(soc_info));
+}
+
+module_init(ux500_sys_soc_init);
+#endif
+