i2400m.h 34.6 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119
/*
 * Intel Wireless WiMAX Connection 2400m
 * Declarations for bus-generic internal APIs
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 * Yanir Lubetkin <yanirx.lubetkin@intel.com>
 *  - Initial implementation
 *
 *
 * GENERAL DRIVER ARCHITECTURE
 *
 * The i2400m driver is split in the following two major parts:
 *
 *  - bus specific driver
 *  - bus generic driver (this part)
 *
 * The bus specific driver sets up stuff specific to the bus the
 * device is connected to (USB, SDIO, PCI, tam-tam...non-authoritative
 * nor binding list) which is basically the device-model management
 * (probe/disconnect, etc), moving data from device to kernel and
 * back, doing the power saving details and reseting the device.
 *
 * For details on each bus-specific driver, see it's include file,
 * i2400m-BUSNAME.h
 *
 * The bus-generic functionality break up is:
 *
 *  - Firmware upload: fw.c - takes care of uploading firmware to the
 *        device. bus-specific driver just needs to provides a way to
 *        execute boot-mode commands and to reset the device.
 *
 *  - RX handling: rx.c - receives data from the bus-specific code and
 *        feeds it to the network or WiMAX stack or uses it to modify
 *        the driver state. bus-specific driver only has to receive
 *        frames and pass them to this module.
 *
 *  - TX handling: tx.c - manages the TX FIFO queue and provides means
 *        for the bus-specific TX code to pull data from the FIFO
 *        queue. bus-specific code just pulls frames from this module
 *        to sends them to the device.
 *
 *  - netdev glue: netdev.c - interface with Linux networking
 *        stack. Pass around data frames, and configure when the
 *        device is up and running or shutdown (through ifconfig up /
 *        down). Bus-generic only.
 *
 *  - control ops: control.c - implements various commmands for
 *        controlling the device. bus-generic only.
 *
 *  - device model glue: driver.c - implements helpers for the
 *        device-model glue done by the bus-specific layer
 *        (setup/release the driver resources), turning the device on
 *        and off, handling the device reboots/resets and a few simple
 *        WiMAX stack ops.
 *
 * Code is also broken up in linux-glue / device-glue.
 *
 * Linux glue contains functions that deal mostly with gluing with the
 * rest of the Linux kernel.
 *
 * Device-glue are functions that deal mostly with the way the device
 * does things and talk the device's language.
 *
 * device-glue code is licensed BSD so other open source OSes can take
 * it to implement their drivers.
 *
 *
 * APIs AND HEADER FILES
 *
 * This bus generic code exports three APIs:
 *
 *  - HDI (host-device interface) definitions common to all busses
 *    (include/linux/wimax/i2400m.h); these can be also used by user
 *    space code.
 *  - internal API for the bus-generic code
 *  - external API for the bus-specific drivers
 *
 *
 * LIFE CYCLE:
 *
 * When the bus-specific driver probes, it allocates a network device
 * with enough space for it's data structue, that must contain a
 * &struct i2400m at the top.
 *
 * On probe, it needs to fill the i2400m members marked as [fill], as
 * well as i2400m->wimax_dev.net_dev and call i2400m_setup(). The
 * i2400m driver will only register with the WiMAX and network stacks;
 * the only access done to the device is to read the MAC address so we
120
 * can register a network device.
121
 *
122 123 124 125
 * The high-level call flow is:
 *
 * bus_probe()
 *   i2400m_setup()
126
 *     i2400m->bus_setup()
127 128 129 130 131 132 133
 *     boot rom initialization / read mac addr
 *     network / WiMAX stacks registration
 *     i2400m_dev_start()
 *       i2400m->bus_dev_start()
 *       i2400m_dev_initialize()
 *
 * The reverse applies for a disconnect() call:
134
 *
135 136 137 138 139 140
 * bus_disconnect()
 *   i2400m_release()
 *     i2400m_dev_stop()
 *       i2400m_dev_shutdown()
 *       i2400m->bus_dev_stop()
 *     network / WiMAX stack unregistration
141
 *     i2400m->bus_release()
142 143
 *
 * At this point, control and data communications are possible.
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
 *
 * While the device is up, it might reset. The bus-specific driver has
 * to catch that situation and call i2400m_dev_reset_handle() to deal
 * with it (reset the internal driver structures and go back to square
 * one).
 */

#ifndef __I2400M_H__
#define __I2400M_H__

#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/completion.h>
#include <linux/rwsem.h>
#include <asm/atomic.h>
#include <net/wimax.h>
#include <linux/wimax/i2400m.h>
#include <asm/byteorder.h>

163 164 165 166 167 168 169 170 171 172
enum {
/* netdev interface */
	/*
	 * Out of NWG spec (R1_v1.2.2), 3.3.3 ASN Bearer Plane MTU Size
	 *
	 * The MTU is 1400 or less
	 */
	I2400M_MAX_MTU = 1400,
};

173 174 175 176 177 178 179
/* Misc constants */
enum {
	/* Size of the Boot Mode Command buffer */
	I2400M_BM_CMD_BUF_SIZE = 16 * 1024,
	I2400M_BM_ACK_BUF_SIZE = 256,
};

180 181 182 183 184
enum {
	/* Maximum number of bus reset can be retried */
	I2400M_BUS_RESET_RETRIES = 3,
};

185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
/**
 * struct i2400m_poke_table - Hardware poke table for the Intel 2400m
 *
 * This structure will be used to create a device specific poke table
 * to put the device in a consistant state at boot time.
 *
 * @address: The device address to poke
 *
 * @data: The data value to poke to the device address
 *
 */
struct i2400m_poke_table{
	__le32 address;
	__le32 data;
};

#define I2400M_FW_POKE(a, d) {		\
	.address = cpu_to_le32(a),	\
	.data = cpu_to_le32(d)		\
}

206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224

/**
 * i2400m_reset_type - methods to reset a device
 *
 * @I2400M_RT_WARM: Reset without device disconnection, device handles
 *     are kept valid but state is back to power on, with firmware
 *     re-uploaded.
 * @I2400M_RT_COLD: Tell the device to disconnect itself from the bus
 *     and reconnect. Renders all device handles invalid.
 * @I2400M_RT_BUS: Tells the bus to reset the device; last measure
 *     used when both types above don't work.
 */
enum i2400m_reset_type {
	I2400M_RT_WARM,	/* first measure */
	I2400M_RT_COLD,	/* second measure */
	I2400M_RT_BUS,	/* call in artillery */
};

struct i2400m_reset_ctx;
225
struct i2400m_roq;
226
struct i2400m_barker_db;
227 228 229 230 231 232 233

/**
 * struct i2400m - descriptor for an Intel 2400m
 *
 * Members marked with [fill] must be filled out/initialized before
 * calling i2400m_setup().
 *
234 235 236 237 238 239 240
 * Note the @bus_setup/@bus_release, @bus_dev_start/@bus_dev_release
 * call pairs are very much doing almost the same, and depending on
 * the underlying bus, some stuff has to be put in one or the
 * other. The idea of setup/release is that they setup the minimal
 * amount needed for loading firmware, where us dev_start/stop setup
 * the rest needed to do full data/control traffic.
 *
241 242 243 244
 * @bus_tx_block_size: [fill] SDIO imposes a 256 block size, USB 16,
 *     so we have a tx_blk_size variable that the bus layer sets to
 *     tell the engine how much of that we need.
 *
245 246 247 248 249
 * @bus_tx_room_min: [fill] Minimum room required while allocating
 *     TX queue's buffer space for message header. SDIO requires
 *     224 bytes and USB 16 bytes. Refer bus specific driver code
 *     for details.
 *
250 251
 * @bus_pl_size_max: [fill] Maximum payload size.
 *
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
 * @bus_setup: [optional fill] Function called by the bus-generic code
 *     [i2400m_setup()] to setup the basic bus-specific communications
 *     to the the device needed to load firmware. See LIFE CYCLE above.
 *
 *     NOTE: Doesn't need to upload the firmware, as that is taken
 *     care of by the bus-generic code.
 *
 * @bus_release: [optional fill] Function called by the bus-generic
 *     code [i2400m_release()] to shutdown the basic bus-specific
 *     communications to the the device needed to load firmware. See
 *     LIFE CYCLE above.
 *
 *     This function does not need to reset the device, just tear down
 *     all the host resources created to  handle communication with
 *     the device.
 *
268 269 270
 * @bus_dev_start: [optional fill] Function called by the bus-generic
 *     code [i2400m_dev_start()] to do things needed to start the
 *     device. See LIFE CYCLE above.
271 272 273 274
 *
 *     NOTE: Doesn't need to upload the firmware, as that is taken
 *     care of by the bus-generic code.
 *
275 276 277
 * @bus_dev_stop: [optional fill] Function called by the bus-generic
 *     code [i2400m_dev_stop()] to do things needed for stopping the
 *     device. See LIFE CYCLE above.
278 279
 *
 *     This function does not need to reset the device, just tear down
280
 *     all the host resources created to handle communication with
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303
 *     the device.
 *
 * @bus_tx_kick: [fill] Function called by the bus-generic code to let
 *     the bus-specific code know that there is data available in the
 *     TX FIFO for transmission to the device.
 *
 *     This function cannot sleep.
 *
 * @bus_reset: [fill] Function called by the bus-generic code to reset
 *     the device in in various ways. Doesn't need to wait for the
 *     reset to finish.
 *
 *     If warm or cold reset fail, this function is expected to do a
 *     bus-specific reset (eg: USB reset) to get the device to a
 *     working state (even if it implies device disconecction).
 *
 *     Note the warm reset is used by the firmware uploader to
 *     reinitialize the device.
 *
 *     IMPORTANT: this is called very early in the device setup
 *     process, so it cannot rely on common infrastructure being laid
 *     out.
 *
304 305 306
 *     IMPORTANT: don't call reset on RT_BUS with i2400m->init_mutex
 *     held, as the .pre/.post reset handlers will deadlock.
 *
307 308 309 310 311 312 313 314 315 316 317
 * @bus_bm_retries: [fill] How many times shall a firmware upload /
 *     device initialization be retried? Different models of the same
 *     device might need different values, hence it is set by the
 *     bus-specific driver. Note this value is used in two places,
 *     i2400m_fw_dnload() and __i2400m_dev_start(); they won't become
 *     multiplicative (__i2400m_dev_start() calling N times
 *     i2400m_fw_dnload() and this trying N times to download the
 *     firmware), as if __i2400m_dev_start() only retries if the
 *     firmware crashed while initializing the device (not in a
 *     general case).
 *
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332
 * @bus_bm_cmd_send: [fill] Function called to send a boot-mode
 *     command. Flags are defined in 'enum i2400m_bm_cmd_flags'. This
 *     is synchronous and has to return 0 if ok or < 0 errno code in
 *     any error condition.
 *
 * @bus_bm_wait_for_ack: [fill] Function called to wait for a
 *     boot-mode notification (that can be a response to a previously
 *     issued command or an asynchronous one). Will read until all the
 *     indicated size is read or timeout. Reading more or less data
 *     than asked for is an error condition. Return 0 if ok, < 0 errno
 *     code on error.
 *
 *     The caller to this function will check if the response is a
 *     barker that indicates the device going into reset mode.
 *
333 334 335 336 337 338 339 340
 * @bus_fw_names: [fill] a NULL-terminated array with the names of the
 *     firmware images to try loading. This is made a list so we can
 *     support backward compatibility of firmware releases (eg: if we
 *     can't find the default v1.4, we try v1.3). In general, the name
 *     should be i2400m-fw-X-VERSION.sbcf, where X is the bus name.
 *     The list is tried in order and the first one that loads is
 *     used. The fw loader will set i2400m->fw_name to point to the
 *     active firmware image.
341 342 343 344 345
 *
 * @bus_bm_mac_addr_impaired: [fill] Set to true if the device's MAC
 *     address provided in boot mode is kind of broken and needs to
 *     be re-read later on.
 *
346 347 348 349 350 351
 * @bus_bm_pokes_table: [fill/optional] A table of device addresses
 *     and values that will be poked at device init time to move the
 *     device to the correct state for the type of boot/firmware being
 *     used.  This table MUST be terminated with (0x000000,
 *     0x00000000) or bad things will happen.
 *
352 353 354 355 356 357
 *
 * @wimax_dev: WiMAX generic device for linkage into the kernel WiMAX
 *     stack. Due to the way a net_device is allocated, we need to
 *     force this to be the first field so that we can get from
 *     netdev_priv() the right pointer.
 *
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378
 * @updown: the device is up and ready for transmitting control and
 *     data packets. This implies @ready (communication infrastructure
 *     with the device is ready) and the device's firmware has been
 *     loaded and the device initialized.
 *
 *     Write to it only inside a i2400m->init_mutex protected area
 *     followed with a wmb(); rmb() before accesing (unless locked
 *     inside i2400m->init_mutex). Read access can be loose like that
 *     [just using rmb()] because the paths that use this also do
 *     other error checks later on.
 *
 * @ready: Communication infrastructure with the device is ready, data
 *     frames can start to be passed around (this is lighter than
 *     using the WiMAX state for certain hot paths).
 *
 *     Write to it only inside a i2400m->init_mutex protected area
 *     followed with a wmb(); rmb() before accesing (unless locked
 *     inside i2400m->init_mutex). Read access can be loose like that
 *     [just using rmb()] because the paths that use this also do
 *     other error checks later on.
 *
379 380 381
 * @rx_reorder: 1 if RX reordering is enabled; this can only be
 *     set at probe time.
 *
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
 * @state: device's state (as reported by it)
 *
 * @state_wq: waitqueue that is woken up whenever the state changes
 *
 * @tx_lock: spinlock to protect TX members
 *
 * @tx_buf: FIFO buffer for TX; we queue data here
 *
 * @tx_in: FIFO index for incoming data. Note this doesn't wrap around
 *     and it is always greater than @tx_out.
 *
 * @tx_out: FIFO index for outgoing data
 *
 * @tx_msg: current TX message that is active in the FIFO for
 *     appending payloads.
 *
 * @tx_sequence: current sequence number for TX messages from the
 *     device to the host.
 *
 * @tx_msg_size: size of the current message being transmitted by the
 *     bus-specific code.
 *
 * @tx_pl_num: total number of payloads sent
 *
 * @tx_pl_max: maximum number of payloads sent in a TX message
 *
 * @tx_pl_min: minimum number of payloads sent in a TX message
 *
 * @tx_num: number of TX messages sent
 *
 * @tx_size_acc: number of bytes in all TX messages sent
 *     (this is different to net_dev's statistics as it also counts
 *     control messages).
 *
 * @tx_size_min: smallest TX message sent.
 *
 * @tx_size_max: biggest TX message sent.
 *
420
 * @rx_lock: spinlock to protect RX members and rx_roq_refcount.
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
 *
 * @rx_pl_num: total number of payloads received
 *
 * @rx_pl_max: maximum number of payloads received in a RX message
 *
 * @rx_pl_min: minimum number of payloads received in a RX message
 *
 * @rx_num: number of RX messages received
 *
 * @rx_size_acc: number of bytes in all RX messages received
 *     (this is different to net_dev's statistics as it also counts
 *     control messages).
 *
 * @rx_size_min: smallest RX message received.
 *
 * @rx_size_max: buggest RX message received.
 *
438 439 440 441 442 443
 * @rx_roq: RX ReOrder queues. (fw >= v1.4) When packets are received
 *     out of order, the device will ask the driver to hold certain
 *     packets until the ones that are received out of order can be
 *     delivered. Then the driver can release them to the host. See
 *     drivers/net/i2400m/rx.c for details.
 *
444 445 446 447
 * @rx_roq_refcount: refcount rx_roq. This refcounts any access to
 *     rx_roq thus preventing rx_roq being destroyed when rx_roq
 *     is being accessed. rx_roq_refcount is protected by rx_lock.
 *
448 449 450 451 452 453 454
 * @rx_reports: reports received from the device that couldn't be
 *     processed because the driver wasn't still ready; when ready,
 *     they are pulled from here and chewed.
 *
 * @rx_reports_ws: Work struct used to kick a scan of the RX reports
 *     list and to process each.
 *
455 456 457 458
 * @src_mac_addr: MAC address used to make ethernet packets be coming
 *     from. This is generated at i2400m_setup() time and used during
 *     the life cycle of the instance. See i2400m_fake_eth_header().
 *
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509
 * @init_mutex: Mutex used for serializing the device bringup
 *     sequence; this way if the device reboots in the middle, we
 *     don't try to do a bringup again while we are tearing down the
 *     one that failed.
 *
 *     Can't reuse @msg_mutex because from within the bringup sequence
 *     we need to send messages to the device and thus use @msg_mutex.
 *
 * @msg_mutex: mutex used to send control commands to the device (we
 *     only allow one at a time, per host-device interface design).
 *
 * @msg_completion: used to wait for an ack to a control command sent
 *     to the device.
 *
 * @ack_skb: used to store the actual ack to a control command if the
 *     reception of the command was successful. Otherwise, a ERR_PTR()
 *     errno code that indicates what failed with the ack reception.
 *
 *     Only valid after @msg_completion is woken up. Only updateable
 *     if @msg_completion is armed. Only touched by
 *     i2400m_msg_to_dev().
 *
 *     Protected by @rx_lock. In theory the command execution flow is
 *     sequential, but in case the device sends an out-of-phase or
 *     very delayed response, we need to avoid it trampling current
 *     execution.
 *
 * @bm_cmd_buf: boot mode command buffer for composing firmware upload
 *     commands.
 *
 *     USB can't r/w to stack, vmalloc, etc...as well, we end up
 *     having to alloc/free a lot to compose commands, so we use these
 *     for stagging and not having to realloc all the time.
 *
 *     This assumes the code always runs serialized. Only one thread
 *     can call i2400m_bm_cmd() at the same time.
 *
 * @bm_ack_buf: boot mode acknoledge buffer for staging reception of
 *     responses to commands.
 *
 *     See @bm_cmd_buf.
 *
 * @work_queue: work queue for processing device reports. This
 *     workqueue cannot be used for processing TX or RX to the device,
 *     as from it we'll process device reports, which might require
 *     further communication with the device.
 *
 * @debugfs_dentry: hookup for debugfs files.
 *     These have to be in a separate directory, a child of
 *     (wimax_dev->debugfs_dentry) so they can be removed when the
 *     module unloads, as we don't keep each dentry.
510 511
 *
 * @fw_name: name of the firmware image that is currently being used.
512 513 514
 *
 * @fw_version: version of the firmware interface, Major.minor,
 *     encoded in the high word and low word (major << 16 | minor).
515
 *
516 517 518
 * @fw_hdrs: NULL terminated array of pointers to the firmware
 *     headers. This is only available during firmware load time.
 *
519 520 521 522 523 524 525 526
 * @fw_cached: Used to cache firmware when the system goes to
 *     suspend/standby/hibernation (as on resume we can't read it). If
 *     NULL, no firmware was cached, read it. If ~0, you can't read
 *     any firmware files (the system still didn't come out of suspend
 *     and failed to cache one), so abort; otherwise, a valid cached
 *     firmware to be used. Access to this variable is protected by
 *     the spinlock i2400m->rx_lock.
 *
527 528 529 530 531
 * @barker: barker type that the device uses; this is initialized by
 *     i2400m_is_boot_barker() the first time it is called. Then it
 *     won't change during the life cycle of the device and everytime
 *     a boot barker is received, it is just verified for it being the
 *     same.
532 533
 *
 * @pm_notifier: used to register for PM events
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
 *
 * @bus_reset_retries: counter for the number of bus resets attempted for
 *	this boot. It's not for tracking the number of bus resets during
 *	the whole driver life cycle (from insmod to rmmod) but for the
 *	number of dev_start() executed until dev_start() returns a success
 *	(ie: a good boot means a dev_stop() followed by a successful
 *	dev_start()). dev_reset_handler() increments this counter whenever
 *	it is triggering a bus reset. It checks this counter to decide if a
 *	subsequent bus reset should be retried. dev_reset_handler() retries
 *	the bus reset until dev_start() succeeds or the counter reaches
 *	I2400M_BUS_RESET_RETRIES. The counter is cleared to 0 in
 *	dev_reset_handle() when dev_start() returns a success,
 *	ie: a successul boot is completed.
 *
 * @alive: flag to denote if the device *should* be alive. This flag is
 *	everything like @updown (see doc for @updown) except reflecting
 *	the device state *we expect* rather than the actual state as denoted
 *	by @updown. It is set 1 whenever @updown is set 1 in dev_start().
 *	Then the device is expected to be alive all the time
 *	(i2400m->alive remains 1) until the driver is removed. Therefore
 *	all the device reboot events detected can be still handled properly
 *	by either dev_reset_handle() or .pre_reset/.post_reset as long as
 *	the driver presents. It is set 0 along with @updown in dev_stop().
557 558 559 560 561 562 563 564 565
 *
 * @error_recovery: flag to denote if we are ready to take an error recovery.
 *	0 for ready to take an error recovery; 1 for not ready. It is
 *	initialized to 1 while probe() since we don't tend to take any error
 *	recovery during probe(). It is decremented by 1 whenever dev_start()
 *	succeeds to indicate we are ready to take error recovery from now on.
 *	It is checked every time we wanna schedule an error recovery. If an
 *	error recovery is already in place (error_recovery was set 1), we
 *	should not schedule another one until the last one is done.
566 567 568 569 570 571 572
 */
struct i2400m {
	struct wimax_dev wimax_dev;	/* FIRST! See doc */

	unsigned updown:1;		/* Network device is up or down */
	unsigned boot_mode:1;		/* is the device in boot mode? */
	unsigned sboot:1;		/* signed or unsigned fw boot */
573
	unsigned ready:1;		/* Device comm infrastructure ready */
574
	unsigned rx_reorder:1;		/* RX reorder is enabled */
575
	u8 trace_msg_from_user;		/* echo rx msgs to 'trace' pipe */
576
					/* typed u8 so /sys/kernel/debug/u8 can tweak */
577 578 579 580
	enum i2400m_system_state state;
	wait_queue_head_t state_wq;	/* Woken up when on state updates */

	size_t bus_tx_block_size;
581
	size_t bus_tx_room_min;
582
	size_t bus_pl_size_max;
583 584
	unsigned bus_bm_retries;

585
	int (*bus_setup)(struct i2400m *);
586 587
	int (*bus_dev_start)(struct i2400m *);
	void (*bus_dev_stop)(struct i2400m *);
588
	void (*bus_release)(struct i2400m *);
589 590 591 592 593 594 595
	void (*bus_tx_kick)(struct i2400m *);
	int (*bus_reset)(struct i2400m *, enum i2400m_reset_type);
	ssize_t (*bus_bm_cmd_send)(struct i2400m *,
				   const struct i2400m_bootrom_header *,
				   size_t, int flags);
	ssize_t (*bus_bm_wait_for_ack)(struct i2400m *,
				       struct i2400m_bootrom_header *, size_t);
596
	const char **bus_fw_names;
597
	unsigned bus_bm_mac_addr_impaired:1;
598
	const struct i2400m_poke_table *bus_bm_pokes_table;
599 600 601 602 603 604 605 606 607 608

	spinlock_t tx_lock;		/* protect TX state */
	void *tx_buf;
	size_t tx_in, tx_out;
	struct i2400m_msg_hdr *tx_msg;
	size_t tx_sequence, tx_msg_size;
	/* TX stats */
	unsigned tx_pl_num, tx_pl_max, tx_pl_min,
		tx_num, tx_size_acc, tx_size_min, tx_size_max;

609
	/* RX stuff */
610 611
	/* protect RX state and rx_roq_refcount */
	spinlock_t rx_lock;
612 613
	unsigned rx_pl_num, rx_pl_max, rx_pl_min,
		rx_num, rx_size_acc, rx_size_min, rx_size_max;
614 615
	struct i2400m_roq *rx_roq;	/* access is refcounted */
	struct kref rx_roq_refcount;	/* refcount access to rx_roq */
616
	u8 src_mac_addr[ETH_HLEN];
617 618
	struct list_head rx_reports;	/* under rx_lock! */
	struct work_struct rx_report_ws;
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635

	struct mutex msg_mutex;		/* serialize command execution */
	struct completion msg_completion;
	struct sk_buff *ack_skb;	/* protected by rx_lock */

	void *bm_ack_buf;		/* for receiving acks over USB */
	void *bm_cmd_buf;		/* for issuing commands over USB */

	struct workqueue_struct *work_queue;

	struct mutex init_mutex;	/* protect bringup seq */
	struct i2400m_reset_ctx *reset_ctx;	/* protected by init_mutex */

	struct work_struct wake_tx_ws;
	struct sk_buff *wake_tx_skb;

	struct dentry *debugfs_dentry;
636
	const char *fw_name;		/* name of the current firmware image */
637
	unsigned long fw_version;	/* version of the firmware interface */
638
	const struct i2400m_bcf_hdr **fw_hdrs;
639
	struct i2400m_fw *fw_cached;	/* protected by rx_lock */
640
	struct i2400m_barker_db *barker;
641 642

	struct notifier_block pm_notifier;
643 644 645 646 647 648

	/* counting bus reset retries in this boot */
	atomic_t bus_reset_retries;

	/* if the device is expected to be alive */
	unsigned alive;
649 650 651 652

	/* 0 if we are ready for error recovery; 1 if not ready  */
	atomic_t error_recovery;

653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
};


/*
 * Bus-generic internal APIs
 * -------------------------
 */

static inline
struct i2400m *wimax_dev_to_i2400m(struct wimax_dev *wimax_dev)
{
	return container_of(wimax_dev, struct i2400m, wimax_dev);
}

static inline
struct i2400m *net_dev_to_i2400m(struct net_device *net_dev)
{
	return wimax_dev_to_i2400m(netdev_priv(net_dev));
}

/*
 * Boot mode support
 */

/**
 * i2400m_bm_cmd_flags - flags to i2400m_bm_cmd()
 *
 * @I2400M_BM_CMD_RAW: send the command block as-is, without doing any
 *     extra processing for adding CRC.
 */
enum i2400m_bm_cmd_flags {
	I2400M_BM_CMD_RAW	= 1 << 2,
};

/**
 * i2400m_bri - Boot-ROM indicators
 *
 * Flags for i2400m_bootrom_init() and i2400m_dev_bootstrap() [which
 * are passed from things like i2400m_setup()]. Can be combined with
 * |.
 *
 * @I2400M_BRI_SOFT: The device rebooted already and a reboot
 *     barker received, proceed directly to ack the boot sequence.
 * @I2400M_BRI_NO_REBOOT: Do not reboot the device and proceed
 *     directly to wait for a reboot barker from the device.
 * @I2400M_BRI_MAC_REINIT: We need to reinitialize the boot
D
Daniel Mack 已提交
699
 *     rom after reading the MAC address. This is quite a dirty hack,
700 701 702 703 704 705 706 707 708 709 710 711 712
 *     if you ask me -- the device requires the bootrom to be
 *     intialized after reading the MAC address.
 */
enum i2400m_bri {
	I2400M_BRI_SOFT       = 1 << 1,
	I2400M_BRI_NO_REBOOT  = 1 << 2,
	I2400M_BRI_MAC_REINIT = 1 << 3,
};

extern void i2400m_bm_cmd_prepare(struct i2400m_bootrom_header *);
extern int i2400m_dev_bootstrap(struct i2400m *, enum i2400m_bri);
extern int i2400m_read_mac_addr(struct i2400m *);
extern int i2400m_bootrom_init(struct i2400m *, enum i2400m_bri);
713 714 715 716 717 718 719 720
extern int i2400m_is_boot_barker(struct i2400m *, const void *, size_t);
static inline
int i2400m_is_d2h_barker(const void *buf)
{
	const __le32 *barker = buf;
	return le32_to_cpu(*barker) == I2400M_D2H_MSG_BARKER;
}
extern void i2400m_unknown_barker(struct i2400m *, const void *, size_t);
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787

/* Make/grok boot-rom header commands */

static inline
__le32 i2400m_brh_command(enum i2400m_brh_opcode opcode, unsigned use_checksum,
			  unsigned direct_access)
{
	return cpu_to_le32(
		I2400M_BRH_SIGNATURE
		| (direct_access ? I2400M_BRH_DIRECT_ACCESS : 0)
		| I2400M_BRH_RESPONSE_REQUIRED /* response always required */
		| (use_checksum ? I2400M_BRH_USE_CHECKSUM : 0)
		| (opcode & I2400M_BRH_OPCODE_MASK));
}

static inline
void i2400m_brh_set_opcode(struct i2400m_bootrom_header *hdr,
			   enum i2400m_brh_opcode opcode)
{
	hdr->command = cpu_to_le32(
		(le32_to_cpu(hdr->command) & ~I2400M_BRH_OPCODE_MASK)
		| (opcode & I2400M_BRH_OPCODE_MASK));
}

static inline
unsigned i2400m_brh_get_opcode(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_OPCODE_MASK;
}

static inline
unsigned i2400m_brh_get_response(const struct i2400m_bootrom_header *hdr)
{
	return (le32_to_cpu(hdr->command) & I2400M_BRH_RESPONSE_MASK)
		>> I2400M_BRH_RESPONSE_SHIFT;
}

static inline
unsigned i2400m_brh_get_use_checksum(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_USE_CHECKSUM;
}

static inline
unsigned i2400m_brh_get_response_required(
	const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_RESPONSE_REQUIRED;
}

static inline
unsigned i2400m_brh_get_direct_access(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_DIRECT_ACCESS;
}

static inline
unsigned i2400m_brh_get_signature(const struct i2400m_bootrom_header *hdr)
{
	return (le32_to_cpu(hdr->command) & I2400M_BRH_SIGNATURE_MASK)
		>> I2400M_BRH_SIGNATURE_SHIFT;
}


/*
 * Driver / device setup and internal functions
 */
788
extern void i2400m_init(struct i2400m *);
789
extern int i2400m_reset(struct i2400m *, enum i2400m_reset_type);
790
extern void i2400m_netdev_setup(struct net_device *net_dev);
791 792
extern int i2400m_sysfs_setup(struct device_driver *);
extern void i2400m_sysfs_release(struct device_driver *);
793 794 795 796
extern int i2400m_tx_setup(struct i2400m *);
extern void i2400m_wake_tx_work(struct work_struct *);
extern void i2400m_tx_release(struct i2400m *);

797 798 799
extern int i2400m_rx_setup(struct i2400m *);
extern void i2400m_rx_release(struct i2400m *);

800 801 802
extern void i2400m_fw_cache(struct i2400m *);
extern void i2400m_fw_uncache(struct i2400m *);

803 804
extern void i2400m_net_rx(struct i2400m *, struct sk_buff *, unsigned,
			  const void *, int);
805 806
extern void i2400m_net_erx(struct i2400m *, struct sk_buff *,
			   enum i2400m_cs);
807
extern void i2400m_net_wake_stop(struct i2400m *);
808 809 810 811 812 813 814 815 816 817 818 819 820 821
enum i2400m_pt;
extern int i2400m_tx(struct i2400m *, const void *, size_t, enum i2400m_pt);

#ifdef CONFIG_DEBUG_FS
extern int i2400m_debugfs_add(struct i2400m *);
extern void i2400m_debugfs_rm(struct i2400m *);
#else
static inline int i2400m_debugfs_add(struct i2400m *i2400m)
{
	return 0;
}
static inline void i2400m_debugfs_rm(struct i2400m *i2400m) {}
#endif

822
/* Initialize/shutdown the device */
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
extern int i2400m_dev_initialize(struct i2400m *);
extern void i2400m_dev_shutdown(struct i2400m *);

extern struct attribute_group i2400m_dev_attr_group;


/* HDI message's payload description handling */

static inline
size_t i2400m_pld_size(const struct i2400m_pld *pld)
{
	return I2400M_PLD_SIZE_MASK & le32_to_cpu(pld->val);
}

static inline
enum i2400m_pt i2400m_pld_type(const struct i2400m_pld *pld)
{
	return (I2400M_PLD_TYPE_MASK & le32_to_cpu(pld->val))
		>> I2400M_PLD_TYPE_SHIFT;
}

static inline
void i2400m_pld_set(struct i2400m_pld *pld, size_t size,
		    enum i2400m_pt type)
{
	pld->val = cpu_to_le32(
		((type << I2400M_PLD_TYPE_SHIFT) & I2400M_PLD_TYPE_MASK)
		|  (size & I2400M_PLD_SIZE_MASK));
}


/*
 * API for the bus-specific drivers
 * --------------------------------
 */

static inline
struct i2400m *i2400m_get(struct i2400m *i2400m)
{
	dev_hold(i2400m->wimax_dev.net_dev);
	return i2400m;
}

static inline
void i2400m_put(struct i2400m *i2400m)
{
	dev_put(i2400m->wimax_dev.net_dev);
}

872
extern int i2400m_dev_reset_handle(struct i2400m *, const char *);
873 874
extern int i2400m_pre_reset(struct i2400m *);
extern int i2400m_post_reset(struct i2400m *);
875
extern void i2400m_error_recovery(struct i2400m *);
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908

/*
 * _setup()/_release() are called by the probe/disconnect functions of
 * the bus-specific drivers.
 */
extern int i2400m_setup(struct i2400m *, enum i2400m_bri bm_flags);
extern void i2400m_release(struct i2400m *);

extern int i2400m_rx(struct i2400m *, struct sk_buff *);
extern struct i2400m_msg_hdr *i2400m_tx_msg_get(struct i2400m *, size_t *);
extern void i2400m_tx_msg_sent(struct i2400m *);


/*
 * Utility functions
 */

static inline
struct device *i2400m_dev(struct i2400m *i2400m)
{
	return i2400m->wimax_dev.net_dev->dev.parent;
}

/*
 * Helper for scheduling simple work functions
 *
 * This struct can get any kind of payload attached (normally in the
 * form of a struct where you pack the stuff you want to pass to the
 * _work function).
 */
struct i2400m_work {
	struct work_struct ws;
	struct i2400m *i2400m;
909
	size_t pl_size;
910 911
	u8 pl[0];
};
912

913 914
extern int i2400m_schedule_work(struct i2400m *,
				void (*)(struct work_struct *), gfp_t,
915 916 917 918 919 920 921 922 923 924 925 926
				const void *, size_t);

extern int i2400m_msg_check_status(const struct i2400m_l3l4_hdr *,
				   char *, size_t);
extern int i2400m_msg_size_check(struct i2400m *,
				 const struct i2400m_l3l4_hdr *, size_t);
extern struct sk_buff *i2400m_msg_to_dev(struct i2400m *, const void *, size_t);
extern void i2400m_msg_to_dev_cancel_wait(struct i2400m *, int);
extern void i2400m_msg_ack_hook(struct i2400m *,
				const struct i2400m_l3l4_hdr *, size_t);
extern void i2400m_report_hook(struct i2400m *,
			       const struct i2400m_l3l4_hdr *, size_t);
927
extern void i2400m_report_hook_work(struct work_struct *);
928 929 930 931 932 933 934
extern int i2400m_cmd_enter_powersave(struct i2400m *);
extern int i2400m_cmd_get_state(struct i2400m *);
extern int i2400m_cmd_exit_idle(struct i2400m *);
extern struct sk_buff *i2400m_get_device_info(struct i2400m *);
extern int i2400m_firmware_check(struct i2400m *);
extern int i2400m_set_init_config(struct i2400m *,
				  const struct i2400m_tlv_hdr **, size_t);
935
extern int i2400m_set_idle_timeout(struct i2400m *, unsigned);
936 937 938 939 940 941 942 943 944 945 946 947

static inline
struct usb_endpoint_descriptor *usb_get_epd(struct usb_interface *iface, int ep)
{
	return &iface->cur_altsetting->endpoint[ep].desc;
}

extern int i2400m_op_rfkill_sw_toggle(struct wimax_dev *,
				      enum wimax_rf_state);
extern void i2400m_report_tlv_rf_switches_status(
	struct i2400m *, const struct i2400m_tlv_rf_switches_status *);

948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
/*
 * Helpers for firmware backwards compability
 *
 * As we aim to support at least the firmware version that was
 * released with the previous kernel/driver release, some code will be
 * conditionally executed depending on the firmware version. On each
 * release, the code to support fw releases past the last two ones
 * will be purged.
 *
 * By making it depend on this macros, it is easier to keep it a tab
 * on what has to go and what not.
 */
static inline
unsigned i2400m_le_v1_3(struct i2400m *i2400m)
{
	/* running fw is lower or v1.3 */
	return i2400m->fw_version <= 0x00090001;
}

static inline
unsigned i2400m_ge_v1_4(struct i2400m *i2400m)
{
	/* running fw is higher or v1.4 */
	return i2400m->fw_version >= 0x00090002;
}

974 975 976 977 978 979 980 981 982 983 984 985 986 987

/*
 * Do a millisecond-sleep for allowing wireshark to dump all the data
 * packets. Used only for debugging.
 */
static inline
void __i2400m_msleep(unsigned ms)
{
#if 1
#else
	msleep(ms);
#endif
}

988 989 990 991 992 993

/* module initialization helpers */
extern int i2400m_barker_db_init(const char *);
extern void i2400m_barker_db_exit(void);


994 995

#endif /* #ifndef __I2400M_H__ */