2 * Intel Wireless WiMAX Connection 2400m
3 * Linux driver model glue for the SDIO device, reset & fw upload
6 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
7 * Dirk Brandewie <dirk.j.brandewie@intel.com>
8 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
9 * Yanir Lubetkin <yanirx.lubetkin@intel.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License version
13 * 2 as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 * See i2400m-sdio.h for a general description of this driver.
28 * This file implements driver model glue, and hook ups for the
29 * generic driver to implement the bus-specific functions (device
30 * communication setup/tear down, firmware upload and resetting).
36 * i2400ms_netdev_setup()
38 * i2400m_netdev_setup()
39 * i2400ms_enable_function()
44 * free_netdev(net_dev)
46 * i2400ms_bus_reset() Called by i2400m->bus_reset
48 * __i2400ms_send_barker()
50 * i2400ms_bus_dev_start() Called by i2400m_dev_start() [who is
51 * i2400ms_tx_setup() called by i2400m_setup()]
54 * i2400ms_bus_dev_stop() Called by i2400m_dev_stop() [who is
55 * i2400ms_rx_release() is called by i2400m_release()]
56 * i2400ms_tx_release()
60 #include <linux/debugfs.h>
61 #include <linux/mmc/sdio.h>
62 #include <linux/mmc/sdio_func.h>
63 #include "i2400m-sdio.h"
64 #include <linux/wimax/i2400m.h>
66 #define D_SUBMODULE main
67 #include "sdio-debug-levels.h"
69 /* IOE WiMAX function timeout in seconds */
70 static int ioe_timeout = 2;
71 module_param(ioe_timeout, int, 0);
73 /* Our firmware file name list */
74 static const char *i2400ms_bus_fw_names[] = {
75 #define I2400MS_FW_FILE_NAME "i2400m-fw-sdio-1.3.sbcf"
82 * Enable the SDIO function
84 * Tries to enable the SDIO function; might fail if it is still not
85 * ready (in some hardware, the SDIO WiMAX function is only enabled
86 * when we ask it to explicitly doing). Tries until a timeout is
89 * The reverse of this is...sdio_disable_function()
91 * Returns: 0 if the SDIO function was enabled, < 0 errno code on
92 * error (-ENODEV when it was unable to enable the function).
95 int i2400ms_enable_function(struct sdio_func *func)
99 struct device *dev = &func->dev;
101 d_fnstart(3, dev, "(func %p)\n", func);
102 /* Setup timeout (FIXME: This needs to read the CIS table to
103 * get a real timeout) and then wait for the device to signal
105 timeout = get_jiffies_64() + ioe_timeout * HZ;
107 while (err != 0 && time_before64(get_jiffies_64(), timeout)) {
108 sdio_claim_host(func);
109 err = sdio_enable_func(func);
111 sdio_release_host(func);
112 d_printf(2, dev, "SDIO function enabled\n");
113 goto function_enabled;
115 d_printf(2, dev, "SDIO function failed to enable: %d\n", err);
116 sdio_disable_func(func);
117 sdio_release_host(func);
118 msleep(I2400MS_INIT_SLEEP_INTERVAL);
120 /* If timed out, device is not there yet -- get -ENODEV so
121 * the device driver core will retry later on. */
123 dev_err(dev, "Can't enable WiMAX function; "
124 " has the function been enabled?\n");
128 d_fnend(3, dev, "(func %p) = %d\n", func, err);
134 * Setup driver resources needed to communicate with the device
136 * The fw needs some time to settle, and it was just uploaded,
137 * so give it a break first. I'd prefer to just wait for the device to
138 * send something, but seems the poking we do to enable SDIO stuff
139 * interferes with it, so just give it a break before starting...
142 int i2400ms_bus_dev_start(struct i2400m *i2400m)
145 struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
146 struct sdio_func *func = i2400ms->func;
147 struct device *dev = &func->dev;
149 d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
151 result = i2400ms_rx_setup(i2400ms);
154 result = i2400ms_tx_setup(i2400ms);
157 d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
160 i2400ms_tx_release(i2400ms);
162 i2400ms_rx_release(i2400ms);
164 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
170 void i2400ms_bus_dev_stop(struct i2400m *i2400m)
172 struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
173 struct sdio_func *func = i2400ms->func;
174 struct device *dev = &func->dev;
176 d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
177 i2400ms_rx_release(i2400ms);
178 i2400ms_tx_release(i2400ms);
179 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
184 * Sends a barker buffer to the device
186 * This helper will allocate a kmalloced buffer and use it to transmit
187 * (then free it). Reason for this is that the SDIO host controller
188 * expects alignment (unknown exactly which) which the stack won't
189 * really provide and certain arches/host-controller combinations
190 * cannot use stack/vmalloc/text areas for DMA transfers.
193 int __i2400ms_send_barker(struct i2400ms *i2400ms,
194 const __le32 *barker, size_t barker_size)
197 struct sdio_func *func = i2400ms->func;
198 struct device *dev = &func->dev;
202 buffer = kmalloc(I2400MS_BLK_SIZE, GFP_KERNEL);
206 memcpy(buffer, barker, barker_size);
207 sdio_claim_host(func);
208 ret = sdio_memcpy_toio(func, 0, buffer, I2400MS_BLK_SIZE);
209 sdio_release_host(func);
212 d_printf(0, dev, "E: barker error: %d\n", ret);
221 * Reset a device at different levels (warm, cold or bus)
223 * @i2400ms: device descriptor
224 * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS)
226 * FIXME: not tested -- need to confirm expected effects
228 * Warm and cold resets get an SDIO reset if they fail (unimplemented)
232 * The device will be fully reset internally, but won't be
233 * disconnected from the USB bus (so no reenumeration will
234 * happen). Firmware upload will be neccessary.
236 * The device will send a reboot barker in the notification endpoint
237 * that will trigger the driver to reinitialize the state
238 * automatically from notif.c:i2400m_notification_grok() into
239 * i2400m_dev_bootstrap_delayed().
241 * Cold and bus (USB) reset:
243 * The device will be fully reset internally, disconnected from the
244 * USB bus an a reenumeration will happen. Firmware upload will be
245 * neccessary. Thus, we don't do any locking or struct
246 * reinitialization, as we are going to be fully disconnected and
249 * Note we need to return -ENODEV if a warm reset was requested and we
250 * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset()
251 * and wimax_dev->op_reset.
253 * WARNING: no driver state saved/fixed
256 int i2400ms_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
259 struct i2400ms *i2400ms =
260 container_of(i2400m, struct i2400ms, i2400m);
261 struct device *dev = i2400m_dev(i2400m);
262 static const __le32 i2400m_WARM_BOOT_BARKER[4] = {
263 cpu_to_le32(I2400M_WARM_RESET_BARKER),
264 cpu_to_le32(I2400M_WARM_RESET_BARKER),
265 cpu_to_le32(I2400M_WARM_RESET_BARKER),
266 cpu_to_le32(I2400M_WARM_RESET_BARKER),
268 static const __le32 i2400m_COLD_BOOT_BARKER[4] = {
269 cpu_to_le32(I2400M_COLD_RESET_BARKER),
270 cpu_to_le32(I2400M_COLD_RESET_BARKER),
271 cpu_to_le32(I2400M_COLD_RESET_BARKER),
272 cpu_to_le32(I2400M_COLD_RESET_BARKER),
275 if (rt == I2400M_RT_WARM)
276 result = __i2400ms_send_barker(i2400ms, i2400m_WARM_BOOT_BARKER,
277 sizeof(i2400m_WARM_BOOT_BARKER));
278 else if (rt == I2400M_RT_COLD)
279 result = __i2400ms_send_barker(i2400ms, i2400m_COLD_BOOT_BARKER,
280 sizeof(i2400m_COLD_BOOT_BARKER));
281 else if (rt == I2400M_RT_BUS) {
283 dev_err(dev, "FIXME: SDIO bus reset not implemented\n");
284 result = rt == I2400M_RT_WARM ? -ENODEV : -ENOSYS;
287 if (result < 0 && rt != I2400M_RT_BUS) {
288 dev_err(dev, "%s reset failed (%d); trying SDIO reset\n",
289 rt == I2400M_RT_WARM ? "warm" : "cold", result);
298 void i2400ms_netdev_setup(struct net_device *net_dev)
300 struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
301 struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
302 i2400ms_init(i2400ms);
303 i2400m_netdev_setup(net_dev);
308 * Debug levels control; see debug.h
310 struct d_level D_LEVEL[] = {
311 D_SUBMODULE_DEFINE(main),
312 D_SUBMODULE_DEFINE(tx),
313 D_SUBMODULE_DEFINE(rx),
314 D_SUBMODULE_DEFINE(fw),
316 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
319 #define __debugfs_register(prefix, name, parent) \
321 result = d_level_register_debugfs(prefix, name, parent); \
328 int i2400ms_debugfs_add(struct i2400ms *i2400ms)
331 struct dentry *dentry = i2400ms->i2400m.wimax_dev.debugfs_dentry;
333 dentry = debugfs_create_dir("i2400m-usb", dentry);
334 result = PTR_ERR(dentry);
335 if (IS_ERR(dentry)) {
336 if (result == -ENODEV)
337 result = 0; /* No debugfs support */
340 i2400ms->debugfs_dentry = dentry;
341 __debugfs_register("dl_", main, dentry);
342 __debugfs_register("dl_", tx, dentry);
343 __debugfs_register("dl_", rx, dentry);
344 __debugfs_register("dl_", fw, dentry);
349 debugfs_remove_recursive(i2400ms->debugfs_dentry);
355 * Probe a i2400m interface and register it
357 * @func: SDIO function
358 * @id: SDIO device ID
359 * @returns: 0 if ok, < 0 errno code on error.
361 * Alloc a net device, initialize the bus-specific details and then
362 * calls the bus-generic initialization routine. That will register
363 * the wimax and netdev devices, upload the firmware [using
364 * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the
365 * communication with the device and then will start to talk to it to
366 * finnish setting it up.
368 * Initialization is tricky; some instances of the hw are packed with
369 * others in a way that requires a third driver that enables the WiMAX
370 * function. In those cases, we can't enable the SDIO function and
371 * we'll return with -ENODEV. When the driver that enables the WiMAX
372 * function does its thing, it has to do a bus_rescan_devices() on the
373 * SDIO bus so this driver is called again to enumerate the WiMAX
377 int i2400ms_probe(struct sdio_func *func,
378 const struct sdio_device_id *id)
381 struct net_device *net_dev;
382 struct device *dev = &func->dev;
383 struct i2400m *i2400m;
384 struct i2400ms *i2400ms;
386 /* Allocate instance [calls i2400m_netdev_setup() on it]. */
388 net_dev = alloc_netdev(sizeof(*i2400ms), "wmx%d",
389 i2400ms_netdev_setup);
390 if (net_dev == NULL) {
391 dev_err(dev, "no memory for network device instance\n");
392 goto error_alloc_netdev;
394 SET_NETDEV_DEV(net_dev, dev);
395 i2400m = net_dev_to_i2400m(net_dev);
396 i2400ms = container_of(i2400m, struct i2400ms, i2400m);
397 i2400m->wimax_dev.net_dev = net_dev;
398 i2400ms->func = func;
399 sdio_set_drvdata(func, i2400ms);
401 i2400m->bus_tx_block_size = I2400MS_BLK_SIZE;
402 i2400m->bus_pl_size_max = I2400MS_PL_SIZE_MAX;
403 i2400m->bus_dev_start = i2400ms_bus_dev_start;
404 i2400m->bus_dev_stop = i2400ms_bus_dev_stop;
405 i2400m->bus_tx_kick = i2400ms_bus_tx_kick;
406 i2400m->bus_reset = i2400ms_bus_reset;
407 i2400m->bus_bm_cmd_send = i2400ms_bus_bm_cmd_send;
408 i2400m->bus_bm_wait_for_ack = i2400ms_bus_bm_wait_for_ack;
409 i2400m->bus_fw_names = i2400ms_bus_fw_names;
410 i2400m->bus_bm_mac_addr_impaired = 1;
412 result = i2400ms_enable_function(i2400ms->func);
414 dev_err(dev, "Cannot enable SDIO function: %d\n", result);
415 goto error_func_enable;
418 sdio_claim_host(func);
419 result = sdio_set_block_size(func, I2400MS_BLK_SIZE);
421 dev_err(dev, "Failed to set block size: %d\n", result);
422 goto error_set_blk_size;
424 sdio_release_host(func);
426 result = i2400m_setup(i2400m, I2400M_BRI_NO_REBOOT);
428 dev_err(dev, "cannot setup device: %d\n", result);
432 result = i2400ms_debugfs_add(i2400ms);
434 dev_err(dev, "cannot create SDIO debugfs: %d\n",
436 goto error_debugfs_add;
441 i2400m_release(i2400m);
443 sdio_set_drvdata(func, NULL);
444 sdio_claim_host(func);
446 sdio_disable_func(func);
447 sdio_release_host(func);
449 free_netdev(net_dev);
456 void i2400ms_remove(struct sdio_func *func)
458 struct device *dev = &func->dev;
459 struct i2400ms *i2400ms = sdio_get_drvdata(func);
460 struct i2400m *i2400m = &i2400ms->i2400m;
461 struct net_device *net_dev = i2400m->wimax_dev.net_dev;
463 d_fnstart(3, dev, "SDIO func %p\n", func);
464 debugfs_remove_recursive(i2400ms->debugfs_dentry);
465 i2400m_release(i2400m);
466 sdio_set_drvdata(func, NULL);
467 sdio_claim_host(func);
468 sdio_disable_func(func);
469 sdio_release_host(func);
470 free_netdev(net_dev);
471 d_fnend(3, dev, "SDIO func %p\n", func);
475 I2400MS_INTEL_VID = 0x89,
479 const struct sdio_device_id i2400ms_sdio_ids[] = {
480 /* Intel: i2400m WiMAX over SDIO */
481 { SDIO_DEVICE(I2400MS_INTEL_VID, 0x1402) },
482 { }, /* end: all zeroes */
484 MODULE_DEVICE_TABLE(sdio, i2400ms_sdio_ids);
488 struct sdio_driver i2400m_sdio_driver = {
489 .name = KBUILD_MODNAME,
490 .probe = i2400ms_probe,
491 .remove = i2400ms_remove,
492 .id_table = i2400ms_sdio_ids,
497 int __init i2400ms_driver_init(void)
499 return sdio_register_driver(&i2400m_sdio_driver);
501 module_init(i2400ms_driver_init);
505 void __exit i2400ms_driver_exit(void)
507 flush_scheduled_work(); /* for the stuff we schedule */
508 sdio_unregister_driver(&i2400m_sdio_driver);
510 module_exit(i2400ms_driver_exit);
513 MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
514 MODULE_DESCRIPTION("Intel 2400M WiMAX networking for SDIO");
515 MODULE_LICENSE("GPL");
516 MODULE_FIRMWARE(I2400MS_FW_FILE_NAME);