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Diffstat (limited to 'drivers/sh/superhyway/superhyway.c')
| -rw-r--r-- | drivers/sh/superhyway/superhyway.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/sh/superhyway/superhyway.c b/drivers/sh/superhyway/superhyway.c new file mode 100644 index 000000000..348836b90 --- /dev/null +++ b/drivers/sh/superhyway/superhyway.c @@ -0,0 +1,238 @@ +/* + * 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 = kzalloc(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_groups = superhyway_dev_groups, +#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"); |