--- /dev/null
+/*
+ * 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>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+static int superhyway_devices;
+
+static struct device superhyway_bus_device = {
+ .init_name = "superhyway",
+};
+
+static void superhyway_device_release(struct device *dev)
+{
+ struct superhyway_device *sdev = to_superhyway_device(dev);
+
+ kfree(sdev->resource);
+ kfree(sdev);
+}
+
+/**
+ * superhyway_add_device - Add a SuperHyway module
+ * @base: Physical address where module is mapped.
+ * @sdev: SuperHyway device to add, or NULL to allocate a new one.
+ * @bus: Bus where SuperHyway module resides.
+ *
+ * This is responsible for adding a new SuperHyway module. This sets up a new
+ * struct superhyway_device for the module being added if @sdev == NULL.
+ *
+ * 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 long base, struct superhyway_device *sdev,
+ struct superhyway_bus *bus)
+{
+ struct superhyway_device *dev = sdev;
+
+ if (!dev) {
+ dev = kzalloc(sizeof(struct superhyway_device), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ }
+
+ dev->bus = bus;
+ superhyway_read_vcr(dev, base, &dev->vcr);
+
+ if (!dev->resource) {
+ dev->resource = kmalloc(sizeof(struct resource), GFP_KERNEL);
+ if (!dev->resource) {
+ kfree(dev);
+ return -ENOMEM;
+ }
+
+ 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;
+ dev->id.id = dev->vcr.mod_id;
+
+ sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
+ dev_set_name(&dev->dev, "%02x", superhyway_devices);
+
+ superhyway_devices++;
+
+ return device_register(&dev->dev);
+}
+
+int superhyway_add_devices(struct superhyway_bus *bus,
+ struct superhyway_device **devices,
+ int nr_devices)
+{
+ int i, ret = 0;
+
+ for (i = 0; i < nr_devices; i++) {
+ struct superhyway_device *dev = devices[i];
+ ret |= superhyway_add_device(dev->resource[0].start, dev, bus);
+ }
+
+ return ret;
+}
+
+static int __init superhyway_init(void)
+{
+ struct superhyway_bus *bus;
+ int ret;
+
+ ret = device_register(&superhyway_bus_device);
+ if (unlikely(ret))
+ return ret;
+
+ for (bus = superhyway_channels; bus->ops; bus++)
+ ret |= superhyway_scan_bus(bus);
+
+ return ret;
+}
+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;
+
+ 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
+ .probe = superhyway_device_probe,
+ .remove = superhyway_device_remove,
+};
+
+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_add_devices);
+EXPORT_SYMBOL(superhyway_register_driver);
+EXPORT_SYMBOL(superhyway_unregister_driver);
+
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff