ARM: ux500: export System-on-Chip information ux500 via sysfs

Here we make use of the new System-On-Chip bus 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[0|1|2|...]/[family|machine|revision|soc_id].

It also adds one more node as requested by ST-Ericsson.
'process' depicts the way in which the silicon was manufactured.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index 52af004..5cfa539 100644 (file)
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -28,6 +28,7 @@ config MACH_U8500
        bool "U8500 Development platform"
        depends on UX500_SOC_DB8500
        select TPS6105X
+       select SOC_BUS
        help
          Include support for the mop500 development platform.
 

diff --git a/arch/arm/mach-ux500/cpu-db5500.c b/arch/arm/mach-ux500/cpu-db5500.c
index c402fd6..8f8acfd 100644 (file)
--- a/arch/arm/mach-ux500/cpu-db5500.c
+++ b/arch/arm/mach-ux500/cpu-db5500.c
@@ -212,18 +212,32 @@ static int usb_db5500_tx_dma_cfg[] = {
        DB5500_DMA_DEV38_USB_OTG_OEP_8
 };
 
-struct device* __init u5500_init_devices(void)
+static const char *db5500_read_soc_id(void)
 {
-       /* FIXME: First parameter to be a real parent. */
-       db5500_add_gpios(NULL);
+       return kasprintf(GFP_KERNEL, "u5500 currently unsupported\n");
+}
+
+static struct device * __init db5500_soc_device_init(void)
+{
+       const char *soc_id = db5500_read_soc_id();
+
+       return ux500_soc_device_init(soc_id);
+}
+
+struct device * __init u5500_init_devices(void)
+{
+       struct device *parent;
+
+       parent = db5500_soc_device_init();
+
+       db5500_add_gpios(parent);
        db5500_pmu_init();
-       db5500_dma_init(NULL);
-       db5500_add_rtc(NULL);
-       db5500_add_usb(NULL, usb_db5500_rx_dma_cfg, usb_db5500_tx_dma_cfg);
+       db5500_dma_init(parent);
+       db5500_add_rtc(parent);
+       db5500_add_usb(parent, usb_db5500_rx_dma_cfg, usb_db5500_tx_dma_cfg);
 
        platform_add_devices(db5500_platform_devs,
                             ARRAY_SIZE(db5500_platform_devs));
 
-       /* FIXME: Return value to be a real parent. */
-       return NULL;
+       return parent;
 }

diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 1e8a2cb..afcde3d 100644 (file)
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -24,6 +24,7 @@
 #include <mach/setup.h>
 #include <mach/devices.h>
 #include <mach/usb.h>
+#include <mach/db8500-regs.h>
 
 #include "devices-db8500.h"
 #include "ste-dma40-db8500.h"
@@ -164,18 +165,38 @@ static int usb_db8500_tx_dma_cfg[] = {
        DB8500_DMA_DEV39_USB_OTG_OEP_8
 };
 
+static const char *db8500_read_soc_id(void)
+{
+       void __iomem *uid = __io_address(U8500_BB_UID_BASE);
+
+       return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
+                        readl((u32 *)uid+1),
+                        readl((u32 *)uid+1), readl((u32 *)uid+2),
+                        readl((u32 *)uid+3), readl((u32 *)uid+4));
+}
+
+static struct device * __init db8500_soc_device_init(void)
+{
+       const char *soc_id = db8500_read_soc_id();
+
+       return ux500_soc_device_init(soc_id);
+}
+
 /*
  * This function is called from the board init
  */
-struct device* __init u8500_init_devices(void)
+struct device * __init u8500_init_devices(void)
 {
-       db8500_add_rtc(NULL);
-       db8500_add_gpios(NULL);
-       db8500_add_usb(NULL, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
+       struct device *parent;
+
+       parent = db8500_soc_device_init();
+
+       db8500_add_rtc(parent);
+       db8500_add_gpios(parent);
+       db8500_add_usb(parent, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
 
        platform_device_register_simple("cpufreq-u8500", -1, NULL, 0);
        platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
 
-       /* FIXME: Return value to be a real parent. */
-       return NULL;
+       return parent;
 }

diff --git a/arch/arm/mach-ux500/cpu.c b/arch/arm/mach-ux500/cpu.c
index f418574..055fb6e 100644 (file)
--- a/arch/arm/mach-ux500/cpu.c
+++ b/arch/arm/mach-ux500/cpu.c
@@ -2,6 +2,7 @@
  * Copyright (C) ST-Ericsson SA 2010
  *
  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson
  * License terms: GNU General Public License (GPL) version 2
  */
 
@@ -11,6 +12,10 @@
 #include <linux/mfd/db8500-prcmu.h>
 #include <linux/mfd/db5500-prcmu.h>
 #include <linux/clksrc-dbx500-prcmu.h>
+#include <linux/sys_soc.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
 
 #include <asm/hardware/gic.h>
 #include <asm/mach/map.h>
@@ -50,3 +55,73 @@ void __init ux500_init_irq(void)
                db8500_prcmu_early_init();
        clk_init();
 }
+
+static const char * __init ux500_get_machine(void)
+{
+       return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
+}
+
+static const char * __init ux500_get_family(void)
+{
+       return kasprintf(GFP_KERNEL, "ux500");
+}
+
+static const char * __init ux500_get_revision(void)
+{
+       unsigned int rev = dbx500_revision();
+
+       if (rev == 0x01)
+               return kasprintf(GFP_KERNEL, "%s", "ED");
+       else if (rev >= 0xA0)
+               return kasprintf(GFP_KERNEL, "%d.%d",
+                                (rev >> 4) - 0xA + 1, rev & 0xf);
+
+       return kasprintf(GFP_KERNEL, "%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 __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
+                                    const char *soc_id)
+{
+       soc_dev_attr->soc_id   = soc_id;
+       soc_dev_attr->machine  = ux500_get_machine();
+       soc_dev_attr->family   = ux500_get_family();
+       soc_dev_attr->revision = ux500_get_revision();
+}
+
+struct device_attribute ux500_soc_attr =
+       __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
+
+struct device * __init ux500_soc_device_init(const char *soc_id)
+{
+       struct device *parent;
+       struct soc_device *soc_dev;
+       struct soc_device_attribute *soc_dev_attr;
+
+       soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+       if (!soc_dev_attr)
+               return ERR_PTR(-ENOMEM);
+
+       soc_info_populate(soc_dev_attr, soc_id);
+
+       soc_dev = soc_device_register(soc_dev_attr);
+       if (IS_ERR_OR_NULL(soc_dev)) {
+               kfree(soc_dev_attr);
+               return NULL;
+       }
+
+       parent = soc_device_to_device(soc_dev);
+       if (!IS_ERR_OR_NULL(parent))
+               device_create_file(parent, &ux500_soc_attr);
+
+       return parent;
+}

diff --git a/arch/arm/mach-ux500/include/mach/db8500-regs.h b/arch/arm/mach-ux500/include/mach/db8500-regs.h
index 80e10f5..9ec20b9 100644 (file)
--- a/arch/arm/mach-ux500/include/mach/db8500-regs.h
+++ b/arch/arm/mach-ux500/include/mach/db8500-regs.h
@@ -161,4 +161,7 @@
 #define U8500_MODEM_BASE       0xe000000
 #define U8500_APE_BASE         0x6000000
 
+/* SoC identification number information */
+#define U8500_BB_UID_BASE      (U8500_BACKUPRAM1_BASE + 0xFC0)
+
 #endif

diff --git a/arch/arm/mach-ux500/include/mach/setup.h b/arch/arm/mach-ux500/include/mach/setup.h
index e46b8b1..74b43bb 100644 (file)
--- a/arch/arm/mach-ux500/include/mach/setup.h
+++ b/arch/arm/mach-ux500/include/mach/setup.h
@@ -27,6 +27,8 @@ extern void __init u5500_sdi_init(struct device *parent);
 
 extern void __init db5500_dma_init(struct device *parent);
 
+extern struct device *ux500_soc_device_init(const char *soc_id);
+
 /* We re-use nomadik_timer for this platform */
 extern void nmdk_timer_init(void);