[PATCH 2/6] drivers/base: add bus for System-on-Chip devices
Lee Jones
lee.jones at linaro.org
Fri Jan 20 11:10:25 EST 2012
Traditionally, any System-on-Chip based platform creates a flat list
of platform_devices directly under /sys/devices/platform.
In order to give these some better structure, this introduces a new
bus type for soc_devices that are registered with the new
soc_device_register() function. All devices that are on the same
chip should then be registered as child devices of the soc device.
The soc bus also exports a few standardised device attributes which
allow user space to query the specific type of soc.
Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
drivers/base/Kconfig | 3 +
drivers/base/Makefile | 1 +
drivers/base/soc.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/sys_soc.h | 37 ++++++++++
4 files changed, 216 insertions(+), 0 deletions(-)
create mode 100644 drivers/base/soc.c
create mode 100644 include/linux/sys_soc.h
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 7be9f79..9aa618a 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -176,6 +176,9 @@ config GENERIC_CPU_DEVICES
bool
default n
+config SOC_BUS
+ bool
+
source "drivers/base/regmap/Kconfig"
config DMA_SHARED_BUFFER
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 2c8272d..4f302a6 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_MODULES) += module.o
endif
obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o
obj-$(CONFIG_REGMAP) += regmap/
+obj-$(CONFIG_SOC_BUS) += soc.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
diff --git a/drivers/base/soc.c b/drivers/base/soc.c
new file mode 100644
index 0000000..90353b5
--- /dev/null
+++ b/drivers/base/soc.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * Author: Lee Jones <lee.jones at linaro.org> for ST-Ericsson.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <linux/spinlock.h>
+#include <linux/sys_soc.h>
+#include <linux/err.h>
+
+static struct ida soc_ida;
+static spinlock_t soc_lock;
+
+static ssize_t soc_info_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+struct soc_device {
+ struct device dev;
+ struct soc_device_attribute *attr;
+ int soc_dev_num;
+};
+
+static struct bus_type soc_bus_type = {
+ .name = "soc",
+};
+
+static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL);
+static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL);
+static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL);
+static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL);
+
+static struct attribute *soc_attr[] = {
+ &dev_attr_machine.attr,
+ &dev_attr_family.attr,
+ &dev_attr_soc_id.attr,
+ &dev_attr_revision.attr,
+ NULL,
+};
+
+static const struct attribute_group soc_attr_group = {
+ .attrs = soc_attr,
+};
+
+static const struct attribute_group *soc_attr_groups[] = {
+ &soc_attr_group,
+ NULL,
+};
+
+static ssize_t soc_info_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
+
+ if (attr == &dev_attr_machine)
+ return sprintf(buf, "%s\n", soc_dev->attr->machine);
+ if (attr == &dev_attr_family)
+ return sprintf(buf, "%s\n", soc_dev->attr->family);
+ if (attr == &dev_attr_revision)
+ return sprintf(buf, "%s\n", soc_dev->attr->revision);
+ if (attr == &dev_attr_soc_id)
+ return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
+
+ return -EINVAL;
+
+}
+
+struct device *soc_device_to_device(struct soc_device *soc_dev)
+{
+ return &soc_dev->dev;
+}
+
+static void soc_release(struct device *dev)
+{
+ struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
+
+ kfree(soc_dev);
+}
+
+struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
+{
+ struct soc_device *soc_dev;
+ int ret;
+ int i, j = 0;
+
+ soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
+ if (!soc_dev) {
+ ret = -ENOMEM;
+ goto out1;
+ }
+
+ /* Ensure no empty attributes are created. */
+ for (i = 0; i < sizeof(*soc_attr); i++) {
+ if ( soc_attr[i] != NULL ) {
+ soc_attr[j++] = soc_attr[i];
+ }
+ }
+ for (i = j; i < sizeof(*soc_attr); i++) {
+ soc_attr[i] = NULL;
+ }
+
+ /* Fetch a unique (reclaimable) SOC ID. */
+ do {
+ if (!ida_pre_get(&soc_ida, GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto out2;
+ }
+
+ spin_lock(&soc_lock);
+ ret = ida_get_new(&soc_ida, &soc_dev->soc_dev_num);
+ spin_unlock(&soc_lock);
+
+ } while (ret == -EAGAIN);
+
+ if (ret)
+ goto out2;
+
+ soc_dev->attr = soc_dev_attr;
+ soc_dev->dev.bus = &soc_bus_type;
+ soc_dev->dev.groups = soc_attr_groups;
+ soc_dev->dev.release = soc_release;
+
+ dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
+
+ ret = device_register(&soc_dev->dev);
+ if (ret)
+ goto out3;
+
+ return soc_dev;
+
+out3:
+ ida_remove(&soc_ida, soc_dev->soc_dev_num);
+out2:
+ kfree(soc_dev);
+out1:
+ kfree(soc_dev_attr);
+
+ return ERR_PTR(ret);
+}
+
+void soc_device_unregister(struct soc_device *soc_dev)
+{
+ ida_remove(&soc_ida, soc_dev->soc_dev_num);
+
+ device_unregister(&soc_dev->dev);
+
+ kfree(soc_dev->attr);
+ kfree(soc_dev);
+}
+
+static int __init soc_bus_register(void)
+{
+ spin_lock_init(&soc_lock);
+
+ ida_init(&soc_ida);
+
+ return bus_register(&soc_bus_type);
+}
+core_initcall(soc_bus_register);
+
+static void __exit soc_bus_unregister(void)
+{
+ ida_destroy(&soc_ida);
+
+ bus_unregister(&soc_bus_type);
+}
+module_exit(soc_bus_unregister);
diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h
new file mode 100644
index 0000000..2739ccb
--- /dev/null
+++ b/include/linux/sys_soc.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ * Author: Lee Jones <lee.jones at linaro.org> for ST-Ericsson.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+#ifndef __SOC_BUS_H
+#define __SOC_BUS_H
+
+#include <linux/device.h>
+
+struct soc_device_attribute {
+ const char *machine;
+ const char *family;
+ const char *revision;
+ const char *soc_id;
+};
+
+/**
+ * soc_device_register - register SoC as a device
+ * @soc_plat_dev_attr: Attributes passed from platform to be attributed to a SoC
+ */
+struct soc_device *soc_device_register(
+ struct soc_device_attribute *soc_plat_dev_attr);
+
+/**
+ * soc_device_unregister - unregister SoC device
+ * @dev: SoC device to be unregistered
+ */
+void soc_device_unregister(struct soc_device *soc_dev);
+
+/**
+ * soc_device_to_device - helper function to fetch struct device
+ * @soc: Previously registered SoC device container
+ */
+struct device *soc_device_to_device(struct soc_device *soc);
+
+#endif /* __SOC_BUS_H */
--
1.7.5.4
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