dt-bindings: mtd: ingenic: Use standard ecc-engine property
[linux/fpc-iii.git] / drivers / mcb / mcb-core.c
blobbb5c5692dedc5af698e1c6b0ba3bea9c38efffab
1 /*
2 * MEN Chameleon Bus.
4 * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; version 2 of the License.
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/idr.h>
16 #include <linux/mcb.h>
18 static DEFINE_IDA(mcb_ida);
20 static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids,
21 struct mcb_device *dev)
23 if (ids) {
24 while (ids->device) {
25 if (ids->device == dev->id)
26 return ids;
27 ids++;
31 return NULL;
34 static int mcb_match(struct device *dev, struct device_driver *drv)
36 struct mcb_driver *mdrv = to_mcb_driver(drv);
37 struct mcb_device *mdev = to_mcb_device(dev);
38 const struct mcb_device_id *found_id;
40 found_id = mcb_match_id(mdrv->id_table, mdev);
41 if (found_id)
42 return 1;
44 return 0;
47 static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env)
49 struct mcb_device *mdev = to_mcb_device(dev);
50 int ret;
52 ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);
53 if (ret)
54 return -ENOMEM;
56 return 0;
59 static int mcb_probe(struct device *dev)
61 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
62 struct mcb_device *mdev = to_mcb_device(dev);
63 const struct mcb_device_id *found_id;
64 struct module *carrier_mod;
65 int ret;
67 found_id = mcb_match_id(mdrv->id_table, mdev);
68 if (!found_id)
69 return -ENODEV;
71 carrier_mod = mdev->dev.parent->driver->owner;
72 if (!try_module_get(carrier_mod))
73 return -EINVAL;
75 get_device(dev);
76 ret = mdrv->probe(mdev, found_id);
77 if (ret)
78 module_put(carrier_mod);
80 return ret;
83 static int mcb_remove(struct device *dev)
85 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
86 struct mcb_device *mdev = to_mcb_device(dev);
87 struct module *carrier_mod;
89 mdrv->remove(mdev);
91 carrier_mod = mdev->dev.parent->driver->owner;
92 module_put(carrier_mod);
94 put_device(&mdev->dev);
96 return 0;
99 static void mcb_shutdown(struct device *dev)
101 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
102 struct mcb_device *mdev = to_mcb_device(dev);
104 if (mdrv && mdrv->shutdown)
105 mdrv->shutdown(mdev);
108 static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
109 char *buf)
111 struct mcb_bus *bus = to_mcb_bus(dev);
113 return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
115 static DEVICE_ATTR_RO(revision);
117 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
118 char *buf)
120 struct mcb_bus *bus = to_mcb_bus(dev);
122 return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
124 static DEVICE_ATTR_RO(model);
126 static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
127 char *buf)
129 struct mcb_bus *bus = to_mcb_bus(dev);
131 return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
133 static DEVICE_ATTR_RO(minor);
135 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
136 char *buf)
138 struct mcb_bus *bus = to_mcb_bus(dev);
140 return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
142 static DEVICE_ATTR_RO(name);
144 static struct attribute *mcb_bus_attrs[] = {
145 &dev_attr_revision.attr,
146 &dev_attr_model.attr,
147 &dev_attr_minor.attr,
148 &dev_attr_name.attr,
149 NULL,
152 static const struct attribute_group mcb_carrier_group = {
153 .attrs = mcb_bus_attrs,
156 static const struct attribute_group *mcb_carrier_groups[] = {
157 &mcb_carrier_group,
158 NULL,
162 static struct bus_type mcb_bus_type = {
163 .name = "mcb",
164 .match = mcb_match,
165 .uevent = mcb_uevent,
166 .probe = mcb_probe,
167 .remove = mcb_remove,
168 .shutdown = mcb_shutdown,
171 static struct device_type mcb_carrier_device_type = {
172 .name = "mcb-carrier",
173 .groups = mcb_carrier_groups,
177 * __mcb_register_driver() - Register a @mcb_driver at the system
178 * @drv: The @mcb_driver
179 * @owner: The @mcb_driver's module
180 * @mod_name: The name of the @mcb_driver's module
182 * Register a @mcb_driver at the system. Perform some sanity checks, if
183 * the .probe and .remove methods are provided by the driver.
185 int __mcb_register_driver(struct mcb_driver *drv, struct module *owner,
186 const char *mod_name)
188 if (!drv->probe || !drv->remove)
189 return -EINVAL;
191 drv->driver.owner = owner;
192 drv->driver.bus = &mcb_bus_type;
193 drv->driver.mod_name = mod_name;
195 return driver_register(&drv->driver);
197 EXPORT_SYMBOL_GPL(__mcb_register_driver);
200 * mcb_unregister_driver() - Unregister a @mcb_driver from the system
201 * @drv: The @mcb_driver
203 * Unregister a @mcb_driver from the system.
205 void mcb_unregister_driver(struct mcb_driver *drv)
207 driver_unregister(&drv->driver);
209 EXPORT_SYMBOL_GPL(mcb_unregister_driver);
211 static void mcb_release_dev(struct device *dev)
213 struct mcb_device *mdev = to_mcb_device(dev);
215 mcb_bus_put(mdev->bus);
216 kfree(mdev);
220 * mcb_device_register() - Register a mcb_device
221 * @bus: The @mcb_bus of the device
222 * @dev: The @mcb_device
224 * Register a specific @mcb_device at a @mcb_bus and the system itself.
226 int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
228 int ret;
229 int device_id;
231 device_initialize(&dev->dev);
232 mcb_bus_get(bus);
233 dev->dev.bus = &mcb_bus_type;
234 dev->dev.parent = bus->dev.parent;
235 dev->dev.release = mcb_release_dev;
236 dev->dma_dev = bus->carrier;
238 device_id = dev->id;
239 dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
240 bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
242 ret = device_add(&dev->dev);
243 if (ret < 0) {
244 pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
245 device_id, bus->bus_nr, ret);
246 goto out;
249 return 0;
251 out:
253 return ret;
255 EXPORT_SYMBOL_GPL(mcb_device_register);
257 static void mcb_free_bus(struct device *dev)
259 struct mcb_bus *bus = to_mcb_bus(dev);
261 put_device(bus->carrier);
262 ida_simple_remove(&mcb_ida, bus->bus_nr);
263 kfree(bus);
267 * mcb_alloc_bus() - Allocate a new @mcb_bus
269 * Allocate a new @mcb_bus.
271 struct mcb_bus *mcb_alloc_bus(struct device *carrier)
273 struct mcb_bus *bus;
274 int bus_nr;
275 int rc;
277 bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
278 if (!bus)
279 return ERR_PTR(-ENOMEM);
281 bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
282 if (bus_nr < 0) {
283 rc = bus_nr;
284 goto err_free;
287 bus->bus_nr = bus_nr;
288 bus->carrier = get_device(carrier);
290 device_initialize(&bus->dev);
291 bus->dev.parent = carrier;
292 bus->dev.bus = &mcb_bus_type;
293 bus->dev.type = &mcb_carrier_device_type;
294 bus->dev.release = &mcb_free_bus;
296 dev_set_name(&bus->dev, "mcb:%d", bus_nr);
297 rc = device_add(&bus->dev);
298 if (rc)
299 goto err_free;
301 return bus;
302 err_free:
303 put_device(carrier);
304 kfree(bus);
305 return ERR_PTR(rc);
307 EXPORT_SYMBOL_GPL(mcb_alloc_bus);
309 static int __mcb_devices_unregister(struct device *dev, void *data)
311 device_unregister(dev);
312 return 0;
315 static void mcb_devices_unregister(struct mcb_bus *bus)
317 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
320 * mcb_release_bus() - Free a @mcb_bus
321 * @bus: The @mcb_bus to release
323 * Release an allocated @mcb_bus from the system.
325 void mcb_release_bus(struct mcb_bus *bus)
327 mcb_devices_unregister(bus);
329 EXPORT_SYMBOL_GPL(mcb_release_bus);
332 * mcb_bus_put() - Increment refcnt
333 * @bus: The @mcb_bus
335 * Get a @mcb_bus' ref
337 struct mcb_bus *mcb_bus_get(struct mcb_bus *bus)
339 if (bus)
340 get_device(&bus->dev);
342 return bus;
344 EXPORT_SYMBOL_GPL(mcb_bus_get);
347 * mcb_bus_put() - Decrement refcnt
348 * @bus: The @mcb_bus
350 * Release a @mcb_bus' ref
352 void mcb_bus_put(struct mcb_bus *bus)
354 if (bus)
355 put_device(&bus->dev);
357 EXPORT_SYMBOL_GPL(mcb_bus_put);
360 * mcb_alloc_dev() - Allocate a device
361 * @bus: The @mcb_bus the device is part of
363 * Allocate a @mcb_device and add bus.
365 struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus)
367 struct mcb_device *dev;
369 dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
370 if (!dev)
371 return NULL;
373 dev->bus = bus;
375 return dev;
377 EXPORT_SYMBOL_GPL(mcb_alloc_dev);
380 * mcb_free_dev() - Free @mcb_device
381 * @dev: The device to free
383 * Free a @mcb_device
385 void mcb_free_dev(struct mcb_device *dev)
387 kfree(dev);
389 EXPORT_SYMBOL_GPL(mcb_free_dev);
391 static int __mcb_bus_add_devices(struct device *dev, void *data)
393 struct mcb_device *mdev = to_mcb_device(dev);
394 int retval;
396 if (mdev->is_added)
397 return 0;
399 retval = device_attach(dev);
400 if (retval < 0)
401 dev_err(dev, "Error adding device (%d)\n", retval);
403 mdev->is_added = true;
405 return 0;
409 * mcb_bus_add_devices() - Add devices in the bus' internal device list
410 * @bus: The @mcb_bus we add the devices
412 * Add devices in the bus' internal device list to the system.
414 void mcb_bus_add_devices(const struct mcb_bus *bus)
416 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
418 EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
421 * mcb_get_resource() - get a resource for a mcb device
422 * @dev: the mcb device
423 * @type: the type of resource
425 struct resource *mcb_get_resource(struct mcb_device *dev, unsigned int type)
427 if (type == IORESOURCE_MEM)
428 return &dev->mem;
429 else if (type == IORESOURCE_IRQ)
430 return &dev->irq;
431 else
432 return NULL;
434 EXPORT_SYMBOL_GPL(mcb_get_resource);
437 * mcb_request_mem() - Request memory
438 * @dev: The @mcb_device the memory is for
439 * @name: The name for the memory reference.
441 * Request memory for a @mcb_device. If @name is NULL the driver name will
442 * be used.
444 struct resource *mcb_request_mem(struct mcb_device *dev, const char *name)
446 struct resource *mem;
447 u32 size;
449 if (!name)
450 name = dev->dev.driver->name;
452 size = resource_size(&dev->mem);
454 mem = request_mem_region(dev->mem.start, size, name);
455 if (!mem)
456 return ERR_PTR(-EBUSY);
458 return mem;
460 EXPORT_SYMBOL_GPL(mcb_request_mem);
463 * mcb_release_mem() - Release memory requested by device
464 * @dev: The @mcb_device that requested the memory
466 * Release memory that was prior requested via @mcb_request_mem().
468 void mcb_release_mem(struct resource *mem)
470 u32 size;
472 size = resource_size(mem);
473 release_mem_region(mem->start, size);
475 EXPORT_SYMBOL_GPL(mcb_release_mem);
477 static int __mcb_get_irq(struct mcb_device *dev)
479 struct resource *irq;
481 irq = mcb_get_resource(dev, IORESOURCE_IRQ);
483 return irq->start;
487 * mcb_get_irq() - Get device's IRQ number
488 * @dev: The @mcb_device the IRQ is for
490 * Get the IRQ number of a given @mcb_device.
492 int mcb_get_irq(struct mcb_device *dev)
494 struct mcb_bus *bus = dev->bus;
496 if (bus->get_irq)
497 return bus->get_irq(dev);
499 return __mcb_get_irq(dev);
501 EXPORT_SYMBOL_GPL(mcb_get_irq);
503 static int mcb_init(void)
505 return bus_register(&mcb_bus_type);
508 static void mcb_exit(void)
510 ida_destroy(&mcb_ida);
511 bus_unregister(&mcb_bus_type);
514 /* mcb must be initialized after PCI but before the chameleon drivers.
515 * That means we must use some initcall between subsys_initcall and
516 * device_initcall.
518 fs_initcall(mcb_init);
519 module_exit(mcb_exit);
521 MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
522 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
523 MODULE_LICENSE("GPL v2");