Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/sh/superhyway/superhyway.c |
| 3 | * |
| 4 | * SuperHyway Bus Driver |
| 5 | * |
| 6 | * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org> |
| 7 | * |
| 8 | * This file is subject to the terms and conditions of the GNU General Public |
| 9 | * License. See the file "COPYING" in the main directory of this archive |
| 10 | * for more details. |
| 11 | */ |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/superhyway.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 19 | #include <linux/string.h> |
| 20 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | static int superhyway_devices; |
| 23 | |
| 24 | static struct device superhyway_bus_device = { |
Kay Sievers | 93fde77 | 2009-03-03 12:16:12 +0900 | [diff] [blame] | 25 | .init_name = "superhyway", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | static void superhyway_device_release(struct device *dev) |
| 29 | { |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 30 | struct superhyway_device *sdev = to_superhyway_device(dev); |
| 31 | |
| 32 | kfree(sdev->resource); |
| 33 | kfree(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | /** |
| 37 | * superhyway_add_device - Add a SuperHyway module |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * @base: Physical address where module is mapped. |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 39 | * @sdev: SuperHyway device to add, or NULL to allocate a new one. |
| 40 | * @bus: Bus where SuperHyway module resides. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * |
| 42 | * This is responsible for adding a new SuperHyway module. This sets up a new |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 43 | * struct superhyway_device for the module being added if @sdev == NULL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | * |
| 45 | * Devices are initially added in the order that they are scanned (from the |
| 46 | * top-down of the memory map), and are assigned an ID based on the order that |
| 47 | * they are added. Any manual addition of a module will thus get the ID after |
| 48 | * the devices already discovered regardless of where it resides in memory. |
| 49 | * |
| 50 | * Further work can and should be done in superhyway_scan_bus(), to be sure |
| 51 | * that any new modules are properly discovered and subsequently registered. |
| 52 | */ |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 53 | int superhyway_add_device(unsigned long base, struct superhyway_device *sdev, |
| 54 | struct superhyway_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 56 | struct superhyway_device *dev = sdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 58 | if (!dev) { |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 59 | dev = kzalloc(sizeof(struct superhyway_device), GFP_KERNEL); |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 60 | if (!dev) |
| 61 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 63 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 65 | dev->bus = bus; |
| 66 | superhyway_read_vcr(dev, base, &dev->vcr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 68 | if (!dev->resource) { |
Toshi Kani | 9a975be | 2016-01-26 21:57:25 +0100 | [diff] [blame] | 69 | dev->resource = kzalloc(sizeof(struct resource), GFP_KERNEL); |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 70 | if (!dev->resource) { |
| 71 | kfree(dev); |
| 72 | return -ENOMEM; |
| 73 | } |
| 74 | |
| 75 | dev->resource->name = dev->name; |
| 76 | dev->resource->start = base; |
| 77 | dev->resource->end = dev->resource->start + 0x01000000; |
| 78 | } |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | dev->dev.parent = &superhyway_bus_device; |
| 81 | dev->dev.bus = &superhyway_bus_type; |
| 82 | dev->dev.release = superhyway_device_release; |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 83 | dev->id.id = dev->vcr.mod_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 85 | sprintf(dev->name, "SuperHyway device %04x", dev->id.id); |
Kay Sievers | 93fde77 | 2009-03-03 12:16:12 +0900 | [diff] [blame] | 86 | dev_set_name(&dev->dev, "%02x", superhyway_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | superhyway_devices++; |
| 89 | |
| 90 | return device_register(&dev->dev); |
| 91 | } |
| 92 | |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 93 | int superhyway_add_devices(struct superhyway_bus *bus, |
| 94 | struct superhyway_device **devices, |
| 95 | int nr_devices) |
| 96 | { |
| 97 | int i, ret = 0; |
| 98 | |
| 99 | for (i = 0; i < nr_devices; i++) { |
| 100 | struct superhyway_device *dev = devices[i]; |
| 101 | ret |= superhyway_add_device(dev->resource[0].start, dev, bus); |
| 102 | } |
| 103 | |
| 104 | return ret; |
| 105 | } |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | static int __init superhyway_init(void) |
| 108 | { |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 109 | struct superhyway_bus *bus; |
Paul Mundt | 07782ce | 2007-11-06 18:05:08 +0900 | [diff] [blame] | 110 | int ret; |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 111 | |
Paul Mundt | 07782ce | 2007-11-06 18:05:08 +0900 | [diff] [blame] | 112 | ret = device_register(&superhyway_bus_device); |
| 113 | if (unlikely(ret)) |
| 114 | return ret; |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 115 | |
| 116 | for (bus = superhyway_channels; bus->ops; bus++) |
| 117 | ret |= superhyway_scan_bus(bus); |
| 118 | |
| 119 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | postcore_initcall(superhyway_init); |
| 122 | |
| 123 | static const struct superhyway_device_id * |
| 124 | superhyway_match_id(const struct superhyway_device_id *ids, |
| 125 | struct superhyway_device *dev) |
| 126 | { |
| 127 | while (ids->id) { |
| 128 | if (ids->id == dev->id.id) |
| 129 | return ids; |
| 130 | |
| 131 | ids++; |
| 132 | } |
| 133 | |
| 134 | return NULL; |
| 135 | } |
| 136 | |
| 137 | static int superhyway_device_probe(struct device *dev) |
| 138 | { |
| 139 | struct superhyway_device *shyway_dev = to_superhyway_device(dev); |
| 140 | struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver); |
| 141 | |
| 142 | if (shyway_drv && shyway_drv->probe) { |
| 143 | const struct superhyway_device_id *id; |
| 144 | |
| 145 | id = superhyway_match_id(shyway_drv->id_table, shyway_dev); |
| 146 | if (id) |
| 147 | return shyway_drv->probe(shyway_dev, id); |
| 148 | } |
| 149 | |
| 150 | return -ENODEV; |
| 151 | } |
| 152 | |
| 153 | static int superhyway_device_remove(struct device *dev) |
| 154 | { |
| 155 | struct superhyway_device *shyway_dev = to_superhyway_device(dev); |
| 156 | struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver); |
| 157 | |
| 158 | if (shyway_drv && shyway_drv->remove) { |
| 159 | shyway_drv->remove(shyway_dev); |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | return -ENODEV; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * superhyway_register_driver - Register a new SuperHyway driver |
| 168 | * @drv: SuperHyway driver to register. |
| 169 | * |
| 170 | * This registers the passed in @drv. Any devices matching the id table will |
| 171 | * automatically be populated and handed off to the driver's specified probe |
| 172 | * routine. |
| 173 | */ |
| 174 | int superhyway_register_driver(struct superhyway_driver *drv) |
| 175 | { |
| 176 | drv->drv.name = drv->name; |
| 177 | drv->drv.bus = &superhyway_bus_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | return driver_register(&drv->drv); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * superhyway_unregister_driver - Unregister a SuperHyway driver |
| 184 | * @drv: SuperHyway driver to unregister. |
| 185 | * |
| 186 | * This cleans up after superhyway_register_driver(), and should be invoked in |
| 187 | * the exit path of any module drivers. |
| 188 | */ |
| 189 | void superhyway_unregister_driver(struct superhyway_driver *drv) |
| 190 | { |
| 191 | driver_unregister(&drv->drv); |
| 192 | } |
| 193 | |
| 194 | static int superhyway_bus_match(struct device *dev, struct device_driver *drv) |
| 195 | { |
| 196 | struct superhyway_device *shyway_dev = to_superhyway_device(dev); |
| 197 | struct superhyway_driver *shyway_drv = to_superhyway_driver(drv); |
| 198 | const struct superhyway_device_id *ids = shyway_drv->id_table; |
| 199 | |
| 200 | if (!ids) |
| 201 | return -EINVAL; |
| 202 | if (superhyway_match_id(ids, shyway_dev)) |
| 203 | return 1; |
| 204 | |
| 205 | return -ENODEV; |
| 206 | } |
| 207 | |
| 208 | struct bus_type superhyway_bus_type = { |
| 209 | .name = "superhyway", |
| 210 | .match = superhyway_bus_match, |
| 211 | #ifdef CONFIG_SYSFS |
| 212 | .dev_attrs = superhyway_dev_attrs, |
| 213 | #endif |
Russell King | ff2dae7 | 2006-01-05 14:42:40 +0000 | [diff] [blame] | 214 | .probe = superhyway_device_probe, |
| 215 | .remove = superhyway_device_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | }; |
| 217 | |
| 218 | static int __init superhyway_bus_init(void) |
| 219 | { |
| 220 | return bus_register(&superhyway_bus_type); |
| 221 | } |
| 222 | |
| 223 | static void __exit superhyway_bus_exit(void) |
| 224 | { |
| 225 | device_unregister(&superhyway_bus_device); |
| 226 | bus_unregister(&superhyway_bus_type); |
| 227 | } |
| 228 | |
| 229 | core_initcall(superhyway_bus_init); |
| 230 | module_exit(superhyway_bus_exit); |
| 231 | |
| 232 | EXPORT_SYMBOL(superhyway_bus_type); |
| 233 | EXPORT_SYMBOL(superhyway_add_device); |
Paul Mundt | 055a251 | 2005-11-07 00:58:21 -0800 | [diff] [blame] | 234 | EXPORT_SYMBOL(superhyway_add_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | EXPORT_SYMBOL(superhyway_register_driver); |
| 236 | EXPORT_SYMBOL(superhyway_unregister_driver); |
| 237 | |
| 238 | MODULE_LICENSE("GPL"); |