* [PATCH] Add SuperHyway bus subsystem
2005-03-10 0:37 [BK PATCH] Add Superhighway bus support for 2.6.11 Greg KH
@ 2005-03-10 0:38 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2005-03-10 0:38 UTC (permalink / raw)
To: linux-kernel; +Cc: paul.mundt
ChangeSet 1.2027.3.1, 2005/03/09 12:14:18-08:00, paul.mundt@nokia.com
[PATCH] Add SuperHyway bus subsystem
Signed-off-by: Paul Mundt <paul.mundt@nokia.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
drivers/sh/Makefile | 6
drivers/sh/superhyway/Makefile | 7 +
drivers/sh/superhyway/superhyway-sysfs.c | 45 ++++++
drivers/sh/superhyway/superhyway.c | 201 +++++++++++++++++++++++++++++++
include/linux/superhyway.h | 79 ++++++++++++
5 files changed, 338 insertions(+)
diff -Nru a/drivers/sh/Makefile b/drivers/sh/Makefile
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/sh/Makefile 2005-03-09 16:36:31 -08:00
@@ -0,0 +1,6 @@
+#
+# Makefile for the SuperH specific drivers.
+#
+
+obj-$(CONFIG_SUPERHYWAY) += superhyway/
+
diff -Nru a/drivers/sh/superhyway/Makefile b/drivers/sh/superhyway/Makefile
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/sh/superhyway/Makefile 2005-03-09 16:36:31 -08:00
@@ -0,0 +1,7 @@
+#
+# Makefile for the SuperHyway bus drivers.
+#
+
+obj-$(CONFIG_SUPERHYWAY) += superhyway.o
+obj-$(CONFIG_SYSFS) += superhyway-sysfs.o
+
diff -Nru a/drivers/sh/superhyway/superhyway-sysfs.c b/drivers/sh/superhyway/superhyway-sysfs.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/sh/superhyway/superhyway-sysfs.c 2005-03-09 16:36:31 -08:00
@@ -0,0 +1,45 @@
+/*
+ * drivers/sh/superhyway/superhyway-sysfs.c
+ *
+ * SuperHyway Bus sysfs interface
+ *
+ * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/superhyway.h>
+
+#define superhyway_ro_attr(name, fmt, field) \
+static ssize_t name##_show(struct device *dev, char *buf) \
+{ \
+ struct superhyway_device *s = to_superhyway_device(dev); \
+ return sprintf(buf, fmt, s->field); \
+}
+
+/* VCR flags */
+superhyway_ro_attr(perr_flags, "0x%02x\n", vcr.perr_flags);
+superhyway_ro_attr(merr_flags, "0x%02x\n", vcr.merr_flags);
+superhyway_ro_attr(mod_vers, "0x%04x\n", vcr.mod_vers);
+superhyway_ro_attr(mod_id, "0x%04x\n", vcr.mod_id);
+superhyway_ro_attr(bot_mb, "0x%02x\n", vcr.bot_mb);
+superhyway_ro_attr(top_mb, "0x%02x\n", vcr.top_mb);
+
+/* Misc */
+superhyway_ro_attr(resource, "0x%08lx\n", resource.start);
+
+struct device_attribute superhyway_dev_attrs[] = {
+ __ATTR_RO(perr_flags),
+ __ATTR_RO(merr_flags),
+ __ATTR_RO(mod_vers),
+ __ATTR_RO(mod_id),
+ __ATTR_RO(bot_mb),
+ __ATTR_RO(top_mb),
+ __ATTR_RO(resource),
+ __ATTR_NULL,
+};
+
diff -Nru a/drivers/sh/superhyway/superhyway.c b/drivers/sh/superhyway/superhyway.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/sh/superhyway/superhyway.c 2005-03-09 16:36:31 -08:00
@@ -0,0 +1,201 @@
+/*
+ * drivers/sh/superhyway/superhyway.c
+ *
+ * SuperHyway Bus Driver
+ *
+ * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/superhyway.h>
+
+static int superhyway_devices;
+
+static struct device superhyway_bus_device = {
+ .bus_id = "superhyway",
+};
+
+static void superhyway_device_release(struct device *dev)
+{
+ kfree(to_superhyway_device(dev));
+}
+
+/**
+ * superhyway_add_device - Add a SuperHyway module
+ * @mod_id: Module ID (taken from MODULE.VCR.MOD_ID).
+ * @base: Physical address where module is mapped.
+ * @vcr: VCR value.
+ *
+ * This is responsible for adding a new SuperHyway module. This sets up a new
+ * struct superhyway_device for the module being added. Each one of @mod_id,
+ * @base, and @vcr are registered with the new device for further use
+ * elsewhere.
+ *
+ * Devices are initially added in the order that they are scanned (from the
+ * top-down of the memory map), and are assigned an ID based on the order that
+ * they are added. Any manual addition of a module will thus get the ID after
+ * the devices already discovered regardless of where it resides in memory.
+ *
+ * Further work can and should be done in superhyway_scan_bus(), to be sure
+ * that any new modules are properly discovered and subsequently registered.
+ */
+int superhyway_add_device(unsigned int mod_id, unsigned long base,
+ unsigned long long vcr)
+{
+ struct superhyway_device *dev;
+
+ dev = kmalloc(sizeof(struct superhyway_device), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ memset(dev, 0, sizeof(struct superhyway_device));
+
+ dev->id.id = mod_id;
+ sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
+
+ dev->vcr = *((struct vcr_info *)(&vcr));
+ dev->resource.name = dev->name;
+ dev->resource.start = base;
+ dev->resource.end = dev->resource.start + 0x01000000;
+ dev->dev.parent = &superhyway_bus_device;
+ dev->dev.bus = &superhyway_bus_type;
+ dev->dev.release = superhyway_device_release;
+
+ sprintf(dev->dev.bus_id, "%02x", superhyway_devices);
+
+ superhyway_devices++;
+
+ return device_register(&dev->dev);
+}
+
+static int __init superhyway_init(void)
+{
+ device_register(&superhyway_bus_device);
+ return superhyway_scan_bus();
+}
+
+postcore_initcall(superhyway_init);
+
+static const struct superhyway_device_id *
+superhyway_match_id(const struct superhyway_device_id *ids,
+ struct superhyway_device *dev)
+{
+ while (ids->id) {
+ if (ids->id == dev->id.id)
+ return ids;
+
+ ids++;
+ }
+
+ return NULL;
+}
+
+static int superhyway_device_probe(struct device *dev)
+{
+ struct superhyway_device *shyway_dev = to_superhyway_device(dev);
+ struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
+
+ if (shyway_drv && shyway_drv->probe) {
+ const struct superhyway_device_id *id;
+
+ id = superhyway_match_id(shyway_drv->id_table, shyway_dev);
+ if (id)
+ return shyway_drv->probe(shyway_dev, id);
+ }
+
+ return -ENODEV;
+}
+
+static int superhyway_device_remove(struct device *dev)
+{
+ struct superhyway_device *shyway_dev = to_superhyway_device(dev);
+ struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
+
+ if (shyway_drv && shyway_drv->remove) {
+ shyway_drv->remove(shyway_dev);
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+/**
+ * superhyway_register_driver - Register a new SuperHyway driver
+ * @drv: SuperHyway driver to register.
+ *
+ * This registers the passed in @drv. Any devices matching the id table will
+ * automatically be populated and handed off to the driver's specified probe
+ * routine.
+ */
+int superhyway_register_driver(struct superhyway_driver *drv)
+{
+ drv->drv.name = drv->name;
+ drv->drv.bus = &superhyway_bus_type;
+ drv->drv.probe = superhyway_device_probe;
+ drv->drv.remove = superhyway_device_remove;
+
+ return driver_register(&drv->drv);
+}
+
+/**
+ * superhyway_unregister_driver - Unregister a SuperHyway driver
+ * @drv: SuperHyway driver to unregister.
+ *
+ * This cleans up after superhyway_register_driver(), and should be invoked in
+ * the exit path of any module drivers.
+ */
+void superhyway_unregister_driver(struct superhyway_driver *drv)
+{
+ driver_unregister(&drv->drv);
+}
+
+static int superhyway_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct superhyway_device *shyway_dev = to_superhyway_device(dev);
+ struct superhyway_driver *shyway_drv = to_superhyway_driver(drv);
+ const struct superhyway_device_id *ids = shyway_drv->id_table;
+
+ if (!ids)
+ return -EINVAL;
+ if (superhyway_match_id(ids, shyway_dev))
+ return 1;
+
+ return -ENODEV;
+}
+
+struct bus_type superhyway_bus_type = {
+ .name = "superhyway",
+ .match = superhyway_bus_match,
+#ifdef CONFIG_SYSFS
+ .dev_attrs = superhyway_dev_attrs,
+#endif
+};
+
+static int __init superhyway_bus_init(void)
+{
+ return bus_register(&superhyway_bus_type);
+}
+
+static void __exit superhyway_bus_exit(void)
+{
+ device_unregister(&superhyway_bus_device);
+ bus_unregister(&superhyway_bus_type);
+}
+
+core_initcall(superhyway_bus_init);
+module_exit(superhyway_bus_exit);
+
+EXPORT_SYMBOL(superhyway_bus_type);
+EXPORT_SYMBOL(superhyway_add_device);
+EXPORT_SYMBOL(superhyway_register_driver);
+EXPORT_SYMBOL(superhyway_unregister_driver);
+
+MODULE_LICENSE("GPL");
diff -Nru a/include/linux/superhyway.h b/include/linux/superhyway.h
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/include/linux/superhyway.h 2005-03-09 16:36:31 -08:00
@@ -0,0 +1,79 @@
+/*
+ * include/linux/superhyway.h
+ *
+ * SuperHyway Bus definitions
+ *
+ * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef __LINUX_SUPERHYWAY_H
+#define __LINUX_SUPERHYWAY_H
+
+#include <linux/device.h>
+
+/*
+ * SuperHyway IDs
+ */
+#define SUPERHYWAY_DEVICE_ID_SH5_DMAC 0x0183
+
+struct vcr_info {
+ u8 perr_flags; /* P-port Error flags */
+ u8 merr_flags; /* Module Error flags */
+ u16 mod_vers; /* Module Version */
+ u16 mod_id; /* Module ID */
+ u8 bot_mb; /* Bottom Memory block */
+ u8 top_mb; /* Top Memory block */
+};
+
+struct superhyway_device_id {
+ unsigned int id;
+ unsigned long driver_data;
+};
+
+struct superhyway_device;
+extern struct bus_type superhyway_bus_type;
+
+struct superhyway_driver {
+ char *name;
+
+ const struct superhyway_device_id *id_table;
+ struct device_driver drv;
+
+ int (*probe)(struct superhyway_device *dev, const struct superhyway_device_id *id);
+ void (*remove)(struct superhyway_device *dev);
+};
+
+#define to_superhyway_driver(d) container_of((d), struct superhyway_driver, drv)
+
+struct superhyway_device {
+ char name[32];
+
+ struct device dev;
+
+ struct superhyway_device_id id;
+ struct superhyway_driver *drv;
+
+ struct resource resource;
+ struct vcr_info vcr;
+};
+
+#define to_superhyway_device(d) container_of((d), struct superhyway_device, dev)
+
+#define superhyway_get_drvdata(d) dev_get_drvdata(&(d)->dev)
+#define superhyway_set_drvdata(d,p) dev_set_drvdata(&(d)->dev, (p))
+
+extern int superhyway_scan_bus(void);
+
+/* drivers/sh/superhyway/superhyway.c */
+int superhyway_register_driver(struct superhyway_driver *);
+void superhyway_unregister_driver(struct superhyway_driver *);
+int superhyway_add_device(unsigned int, unsigned long, unsigned long long);
+
+/* drivers/sh/superhyway/superhyway-sysfs.c */
+extern struct device_attribute superhyway_dev_attrs[];
+
+#endif /* __LINUX_SUPERHYWAY_H */
+
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