drivers/net/wireless/libertas/if_cs.c

   1 /*
   2
   3   Driver for the Marvell 8385 based compact flash WLAN cards.
   4
   5   (C) 2007 by Holger Schurig <hs4233@mail.mn-solutions.de>
   6
   7   This program is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation; either version 2 of the License, or
  10   (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program; see the file COPYING.  If not, write to
  19   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  20   Boston, MA 02110-1301, USA.
  21
  22 */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/firmware.h>
  31 #include <linux/netdevice.h>
  32
  33 #include <pcmcia/cistpl.h>
  34 #include <pcmcia/ds.h>
  35
  36 #include <linux/io.h>
  37
  38 #define DRV_NAME "libertas_cs"
  39
  40 #include "decl.h"
  41 #include "defs.h"
  42 #include "dev.h"
  43
  44
  45 /********************************************************************/
  46 /* Module stuff                                                     */
  47 /********************************************************************/
  48
  49 MODULE_AUTHOR("Holger Schurig <hs4233@mail.mn-solutions.de>");
  50 MODULE_DESCRIPTION("Driver for Marvell 83xx compact flash WLAN cards");
  51 MODULE_LICENSE("GPL");
  52
  53
  54
  55 /********************************************************************/
  56 /* Data structures                                                  */
  57 /********************************************************************/
  58
  59 struct if_cs_card {
  60         struct pcmcia_device *p_dev;
  61         struct lbs_private *priv;
  62         void __iomem *iobase;
  63         bool align_regs;
  64         u32 model;
  65 };
  66
  67
  68 enum {
  69         MODEL_UNKNOWN = 0x00,
  70         MODEL_8305 = 0x01,
  71         MODEL_8381 = 0x02,
  72         MODEL_8385 = 0x03
  73 };
  74
  75 static const struct lbs_fw_table fw_table[] = {
  76         { MODEL_8305, "libertas/cf8305.bin", NULL },
  77         { MODEL_8305, "libertas_cs_helper.fw", NULL },
  78         { MODEL_8381, "libertas/cf8381_helper.bin", "libertas/cf8381.bin" },
  79         { MODEL_8381, "libertas_cs_helper.fw", "libertas_cs.fw" },
  80         { MODEL_8385, "libertas/cf8385_helper.bin", "libertas/cf8385.bin" },
  81         { MODEL_8385, "libertas_cs_helper.fw", "libertas_cs.fw" },
  82         { 0, NULL, NULL }
  83 };
  84 MODULE_FIRMWARE("libertas/cf8305.bin");
  85 MODULE_FIRMWARE("libertas/cf8381_helper.bin");
  86 MODULE_FIRMWARE("libertas/cf8381.bin");
  87 MODULE_FIRMWARE("libertas/cf8385_helper.bin");
  88 MODULE_FIRMWARE("libertas/cf8385.bin");
  89 MODULE_FIRMWARE("libertas_cs_helper.fw");
  90 MODULE_FIRMWARE("libertas_cs.fw");
  91
  92
  93 /********************************************************************/
  94 /* Hardware access                                                  */
  95 /********************************************************************/
  96
  97 /* This define enables wrapper functions which allow you
  98    to dump all register accesses. You normally won't this,
  99    except for development */
 100 /* #define DEBUG_IO */
 101
 102 #ifdef DEBUG_IO
 103 static int debug_output = 0;
 104 #else
 105 /* This way the compiler optimizes the printk's away */
 106 #define debug_output 0
 107 #endif
 108
 109 static inline unsigned int if_cs_read8(struct if_cs_card *card, uint reg)
 110 {
 111         unsigned int val = ioread8(card->iobase + reg);
 112         if (debug_output)
 113                 printk(KERN_INFO "inb %08x<%02x\n", reg, val);
 114         return val;
 115 }
 116 static inline unsigned int if_cs_read16(struct if_cs_card *card, uint reg)
 117 {
 118         unsigned int val = ioread16(card->iobase + reg);
 119         if (debug_output)
 120                 printk(KERN_INFO "inw %08x<%04x\n", reg, val);
 121         return val;
 122 }
 123 static inline void if_cs_read16_rep(
 124         struct if_cs_card *card,
 125         uint reg,
 126         void *buf,
 127         unsigned long count)
 128 {
 129         if (debug_output)
 130                 printk(KERN_INFO "insw %08x<(0x%lx words)\n",
 131                         reg, count);
 132         ioread16_rep(card->iobase + reg, buf, count);
 133 }
 134
 135 static inline void if_cs_write8(struct if_cs_card *card, uint reg, u8 val)
 136 {
 137         if (debug_output)
 138                 printk(KERN_INFO "outb %08x>%02x\n", reg, val);
 139         iowrite8(val, card->iobase + reg);
 140 }
 141
 142 static inline void if_cs_write16(struct if_cs_card *card, uint reg, u16 val)
 143 {
 144         if (debug_output)
 145                 printk(KERN_INFO "outw %08x>%04x\n", reg, val);
 146         iowrite16(val, card->iobase + reg);
 147 }
 148
 149 static inline void if_cs_write16_rep(
 150         struct if_cs_card *card,
 151         uint reg,
 152         const void *buf,
 153         unsigned long count)
 154 {
 155         if (debug_output)
 156                 printk(KERN_INFO "outsw %08x>(0x%lx words)\n",
 157                         reg, count);
 158         iowrite16_rep(card->iobase + reg, buf, count);
 159 }
 160
 161
 162 /*
 163  * I know that polling/delaying is frowned upon. However, this procedure
 164  * with polling is needed while downloading the firmware. At this stage,
 165  * the hardware does unfortunately not create any interrupts.
 166  *
 167  * Fortunately, this function is never used once the firmware is in
 168  * the card. :-)
 169  *
 170  * As a reference, see the "Firmware Specification v5.1", page 18
 171  * and 19. I did not follow their suggested timing to the word,
 172  * but this works nice & fast anyway.
 173  */
 174 static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 reg)
 175 {
 176         int i;
 177
 178         for (i = 0; i < 100000; i++) {
 179                 u8 val = if_cs_read8(card, addr);
 180                 if (val == reg)
 181                         return 0;
 182                 udelay(5);
 183         }
 184         return -ETIME;
 185 }
 186
 187
 188
 189 /*
 190  * First the bitmasks for the host/card interrupt/status registers:
 191  */
 192 #define IF_CS_BIT_TX                    0x0001
 193 #define IF_CS_BIT_RX                    0x0002
 194 #define IF_CS_BIT_COMMAND               0x0004
 195 #define IF_CS_BIT_RESP                  0x0008
 196 #define IF_CS_BIT_EVENT                 0x0010
 197 #define IF_CS_BIT_MASK                  0x001f
 198
 199
 200
 201 /*
 202  * It's not really clear to me what the host status register is for. It
 203  * needs to be set almost in union with "host int cause". The following
 204  * bits from above are used:
 205  *
 206  *   IF_CS_BIT_TX         driver downloaded a data packet
 207  *   IF_CS_BIT_RX         driver got a data packet
 208  *   IF_CS_BIT_COMMAND    driver downloaded a command
 209  *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 210  *   IF_CS_BIT_EVENT      driver read a host event
 211  */
 212 #define IF_CS_HOST_STATUS               0x00000000
 213
 214 /*
 215  * With the host int cause register can the host (that is, Linux) cause
 216  * an interrupt in the firmware, to tell the firmware about those events:
 217  *
 218  *   IF_CS_BIT_TX         a data packet has been downloaded
 219  *   IF_CS_BIT_RX         a received data packet has retrieved
 220  *   IF_CS_BIT_COMMAND    a firmware block or a command has been downloaded
 221  *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 222  *   IF_CS_BIT_EVENT      a host event (link lost etc) has been retrieved
 223  */
 224 #define IF_CS_HOST_INT_CAUSE            0x00000002
 225
 226 /*
 227  * The host int mask register is used to enable/disable interrupt.  However,
 228  * I have the suspicion that disabled interrupts are lost.
 229  */
 230 #define IF_CS_HOST_INT_MASK             0x00000004
 231
 232 /*
 233  * Used to send or receive data packets:
 234  */
 235 #define IF_CS_WRITE                     0x00000016
 236 #define IF_CS_WRITE_LEN                 0x00000014
 237 #define IF_CS_READ                      0x00000010
 238 #define IF_CS_READ_LEN                  0x00000024
 239
 240 /*
 241  * Used to send commands (and to send firmware block) and to
 242  * receive command responses:
 243  */
 244 #define IF_CS_CMD                       0x0000001A
 245 #define IF_CS_CMD_LEN                   0x00000018
 246 #define IF_CS_RESP                      0x00000012
 247 #define IF_CS_RESP_LEN                  0x00000030
 248
 249 /*
 250  * The card status registers shows what the card/firmware actually
 251  * accepts:
 252  *
 253  *   IF_CS_BIT_TX        you may send a data packet
 254  *   IF_CS_BIT_RX        you may retrieve a data packet
 255  *   IF_CS_BIT_COMMAND   you may send a command
 256  *   IF_CS_BIT_RESP      you may retrieve a command response
 257  *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 258  *
 259  * When reading this register several times, you will get back the same
 260  * results --- with one exception: the IF_CS_BIT_EVENT clear itself
 261  * automatically.
 262  *
 263  * Not that we don't rely on BIT_RX,_BIT_RESP or BIT_EVENT because
 264  * we handle this via the card int cause register.
 265  */
 266 #define IF_CS_CARD_STATUS               0x00000020
 267 #define IF_CS_CARD_STATUS_MASK          0x7f00
 268
 269 /*
 270  * The card int cause register is used by the card/firmware to notify us
 271  * about the following events:
 272  *
 273  *   IF_CS_BIT_TX        a data packet has successfully been sentx
 274  *   IF_CS_BIT_RX        a data packet has been received and can be retrieved
 275  *   IF_CS_BIT_COMMAND   not used
 276  *   IF_CS_BIT_RESP      the firmware has a command response for us
 277  *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 278  */
 279 #define IF_CS_CARD_INT_CAUSE            0x00000022
 280
 281 /*
 282  * This is used to for handshaking with the card's bootloader/helper image
 283  * to synchronize downloading of firmware blocks.
 284  */
 285 #define IF_CS_SQ_READ_LOW               0x00000028
 286 #define IF_CS_SQ_HELPER_OK              0x10
 287
 288 /*
 289  * The scratch register tells us ...
 290  *
 291  * IF_CS_SCRATCH_BOOT_OK     the bootloader runs
 292  * IF_CS_SCRATCH_HELPER_OK   the helper firmware already runs
 293  */
 294 #define IF_CS_SCRATCH                   0x0000003F
 295 #define IF_CS_SCRATCH_BOOT_OK           0x00
 296 #define IF_CS_SCRATCH_HELPER_OK         0x5a
 297
 298 /*
 299  * Used to detect ancient chips:
 300  */
 301 #define IF_CS_PRODUCT_ID                0x0000001C
 302 #define IF_CS_CF8385_B1_REV             0x12
 303 #define IF_CS_CF8381_B3_REV             0x04
 304 #define IF_CS_CF8305_B1_REV             0x03
 305
 306 /*
 307  * Used to detect other cards than CF8385 since their revisions of silicon
 308  * doesn't match those from CF8385, eg. CF8381 B3 works with this driver.
 309  */
 310 #define CF8305_MANFID           0x02db
 311 #define CF8305_CARDID           0x8103
 312 #define CF8381_MANFID           0x02db
 313 #define CF8381_CARDID           0x6064
 314 #define CF8385_MANFID           0x02df
 315 #define CF8385_CARDID           0x8103
 316
 317 /*
 318  * FIXME: just use the 'driver_info' field of 'struct pcmcia_device_id' when
 319  * that gets fixed.  Currently there's no way to access it from the probe hook.
 320  */
 321 static inline u32 get_model(u16 manf_id, u16 card_id)
 322 {
 323         /* NOTE: keep in sync with if_cs_ids */
 324         if (manf_id == CF8305_MANFID && card_id == CF8305_CARDID)
 325                 return MODEL_8305;
 326         else if (manf_id == CF8381_MANFID && card_id == CF8381_CARDID)
 327                 return MODEL_8381;
 328         else if (manf_id == CF8385_MANFID && card_id == CF8385_CARDID)
 329                 return MODEL_8385;
 330         return MODEL_UNKNOWN;
 331 }
 332
 333 /********************************************************************/
 334 /* I/O and interrupt handling                                       */
 335 /********************************************************************/
 336
 337 static inline void if_cs_enable_ints(struct if_cs_card *card)
 338 {
 339         lbs_deb_enter(LBS_DEB_CS);
 340         if_cs_write16(card, IF_CS_HOST_INT_MASK, 0);
 341 }
 342
 343 static inline void if_cs_disable_ints(struct if_cs_card *card)
 344 {
 345         lbs_deb_enter(LBS_DEB_CS);
 346         if_cs_write16(card, IF_CS_HOST_INT_MASK, IF_CS_BIT_MASK);
 347 }
 348
 349 /*
 350  * Called from if_cs_host_to_card to send a command to the hardware
 351  */
 352 static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb)
 353 {
 354         struct if_cs_card *card = (struct if_cs_card *)priv->card;
 355         int ret = -1;
 356         int loops = 0;
 357
 358         lbs_deb_enter(LBS_DEB_CS);
 359         if_cs_disable_ints(card);
 360
 361         /* Is hardware ready? */
 362         while (1) {
 363                 u16 status = if_cs_read16(card, IF_CS_CARD_STATUS);
 364                 if (status & IF_CS_BIT_COMMAND)
 365                         break;
 366                 if (++loops > 100) {
 367                         netdev_err(priv->dev, "card not ready for commands\n");
 368                         goto done;
 369                 }
 370                 mdelay(1);
 371         }
 372
 373         if_cs_write16(card, IF_CS_CMD_LEN, nb);
 374
 375         if_cs_write16_rep(card, IF_CS_CMD, buf, nb / 2);
 376         /* Are we supposed to transfer an odd amount of bytes? */
 377         if (nb & 1)
 378                 if_cs_write8(card, IF_CS_CMD, buf[nb-1]);
 379
 380         /* "Assert the download over interrupt command in the Host
 381          * status register" */
 382         if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
 383
 384         /* "Assert the download over interrupt command in the Card
 385          * interrupt case register" */
 386         if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
 387         ret = 0;
 388
 389 done:
 390         if_cs_enable_ints(card);
 391         lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
 392         return ret;
 393 }
 394
 395 /*
 396  * Called from if_cs_host_to_card to send a data to the hardware
 397  */
 398 static void if_cs_send_data(struct lbs_private *priv, u8 *buf, u16 nb)
 399 {
 400         struct if_cs_card *card = (struct if_cs_card *)priv->card;
 401         u16 status;
 402
 403         lbs_deb_enter(LBS_DEB_CS);
 404         if_cs_disable_ints(card);
 405
 406         status = if_cs_read16(card, IF_CS_CARD_STATUS);
 407         BUG_ON((status & IF_CS_BIT_TX) == 0);
 408
 409         if_cs_write16(card, IF_CS_WRITE_LEN, nb);
 410
 411         /* write even number of bytes, then odd byte if necessary */
 412         if_cs_write16_rep(card, IF_CS_WRITE, buf, nb / 2);
 413         if (nb & 1)
 414                 if_cs_write8(card, IF_CS_WRITE, buf[nb-1]);
 415
 416         if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_TX);
 417         if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_TX);
 418         if_cs_enable_ints(card);
 419
 420         lbs_deb_leave(LBS_DEB_CS);
 421 }
 422
 423 /*
 424  * Get the command result out of the card.
 425  */
 426 static int if_cs_receive_cmdres(struct lbs_private *priv, u8 *data, u32 *len)
 427 {
 428         unsigned long flags;
 429         int ret = -1;
 430         u16 status;
 431
 432         lbs_deb_enter(LBS_DEB_CS);
 433
 434         /* is hardware ready? */
 435         status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
 436         if ((status & IF_CS_BIT_RESP) == 0) {
 437                 netdev_err(priv->dev, "no cmd response in card\n");
 438                 *len = 0;
 439                 goto out;
 440         }
 441
 442         *len = if_cs_read16(priv->card, IF_CS_RESP_LEN);
 443         if ((*len == 0) || (*len > LBS_CMD_BUFFER_SIZE)) {
 444                 netdev_err(priv->dev,
 445                            "card cmd buffer has invalid # of bytes (%d)\n",
 446                            *len);
 447                 goto out;
 448         }
 449
 450         /* read even number of bytes, then odd byte if necessary */
 451         if_cs_read16_rep(priv->card, IF_CS_RESP, data, *len/sizeof(u16));
 452         if (*len & 1)
 453                 data[*len-1] = if_cs_read8(priv->card, IF_CS_RESP);
 454
 455         /* This is a workaround for a firmware that reports too much
 456          * bytes */
 457         *len -= 8;
 458         ret = 0;
 459
 460         /* Clear this flag again */
 461         spin_lock_irqsave(&priv->driver_lock, flags);
 462         priv->dnld_sent = DNLD_RES_RECEIVED;
 463         spin_unlock_irqrestore(&priv->driver_lock, flags);
 464
 465 out:
 466         lbs_deb_leave_args(LBS_DEB_CS, "ret %d, len %d", ret, *len);
 467         return ret;
 468 }
 469
 470 static struct sk_buff *if_cs_receive_data(struct lbs_private *priv)
 471 {
 472         struct sk_buff *skb = NULL;
 473         u16 len;
 474         u8 *data;
 475
 476         lbs_deb_enter(LBS_DEB_CS);
 477
 478         len = if_cs_read16(priv->card, IF_CS_READ_LEN);
 479         if (len == 0 || len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
 480                 netdev_err(priv->dev,
 481                            "card data buffer has invalid # of bytes (%d)\n",
 482                            len);
 483                 priv->dev->stats.rx_dropped++;
 484                 goto dat_err;
 485         }
 486
 487         skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + 2);
 488         if (!skb)
 489                 goto out;
 490         skb_put(skb, len);
 491         skb_reserve(skb, 2);/* 16 byte align */
 492         data = skb->data;
 493
 494         /* read even number of bytes, then odd byte if necessary */
 495         if_cs_read16_rep(priv->card, IF_CS_READ, data, len/sizeof(u16));
 496         if (len & 1)
 497                 data[len-1] = if_cs_read8(priv->card, IF_CS_READ);
 498
 499 dat_err:
 500         if_cs_write16(priv->card, IF_CS_HOST_STATUS, IF_CS_BIT_RX);
 501         if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_RX);
 502
 503 out:
 504         lbs_deb_leave_args(LBS_DEB_CS, "ret %p", skb);
 505         return skb;
 506 }
 507
 508 static irqreturn_t if_cs_interrupt(int irq, void *data)
 509 {
 510         struct if_cs_card *card = data;
 511         struct lbs_private *priv = card->priv;
 512         u16 cause;
 513
 514         lbs_deb_enter(LBS_DEB_CS);
 515
 516         /* Ask card interrupt cause register if there is something for us */
 517         cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE);
 518         lbs_deb_cs("cause 0x%04x\n", cause);
 519
 520         if (cause == 0) {
 521                 /* Not for us */
 522                 return IRQ_NONE;
 523         }
 524
 525         if (cause == 0xffff) {
 526                 /* Read in junk, the card has probably been removed */
 527                 card->priv->surpriseremoved = 1;
 528                 return IRQ_HANDLED;
 529         }
 530
 531         if (cause & IF_CS_BIT_RX) {
 532                 struct sk_buff *skb;
 533                 lbs_deb_cs("rx packet\n");
 534                 skb = if_cs_receive_data(priv);
 535                 if (skb)
 536                         lbs_process_rxed_packet(priv, skb);
 537         }
 538
 539         if (cause & IF_CS_BIT_TX) {
 540                 lbs_deb_cs("tx done\n");
 541                 lbs_host_to_card_done(priv);
 542         }
 543
 544         if (cause & IF_CS_BIT_RESP) {
 545                 unsigned long flags;
 546                 u8 i;
 547
 548                 lbs_deb_cs("cmd resp\n");
 549                 spin_lock_irqsave(&priv->driver_lock, flags);
 550                 i = (priv->resp_idx == 0) ? 1 : 0;
 551                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 552
 553                 BUG_ON(priv->resp_len[i]);
 554                 if_cs_receive_cmdres(priv, priv->resp_buf[i],
 555                         &priv->resp_len[i]);
 556
 557                 spin_lock_irqsave(&priv->driver_lock, flags);
 558                 lbs_notify_command_response(priv, i);
 559                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 560         }
 561
 562         if (cause & IF_CS_BIT_EVENT) {
 563                 u16 status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
 564                 if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE,
 565                         IF_CS_BIT_EVENT);
 566                 lbs_queue_event(priv, (status & IF_CS_CARD_STATUS_MASK) >> 8);
 567         }
 568
 569         /* Clear interrupt cause */
 570         if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK);
 571
 572         lbs_deb_leave(LBS_DEB_CS);
 573         return IRQ_HANDLED;
 574 }
 575
 576
 577
 578
 579 /********************************************************************/
 580 /* Firmware                                                         */
 581 /********************************************************************/
 582
 583 /*
 584  * Tries to program the helper firmware.
 585  *
 586  * Return 0 on success
 587  */
 588 static int if_cs_prog_helper(struct if_cs_card *card, const struct firmware *fw)
 589 {
 590         int ret = 0;
 591         int sent = 0;
 592         u8  scratch;
 593
 594         lbs_deb_enter(LBS_DEB_CS);
 595
 596         /*
 597          * This is the only place where an unaligned register access happens on
 598          * the CF8305 card, therefore for the sake of speed of the driver, we do
 599          * the alignment correction here.
 600          */
 601         if (card->align_regs)
 602                 scratch = if_cs_read16(card, IF_CS_SCRATCH) >> 8;
 603         else
 604                 scratch = if_cs_read8(card, IF_CS_SCRATCH);
 605
 606         /* "If the value is 0x5a, the firmware is already
 607          * downloaded successfully"
 608          */
 609         if (scratch == IF_CS_SCRATCH_HELPER_OK)
 610                 goto done;
 611
 612         /* "If the value is != 00, it is invalid value of register */
 613         if (scratch != IF_CS_SCRATCH_BOOT_OK) {
 614                 ret = -ENODEV;
 615                 goto done;
 616         }
 617
 618         lbs_deb_cs("helper size %td\n", fw->size);
 619
 620         /* "Set the 5 bytes of the helper image to 0" */
 621         /* Not needed, this contains an ARM branch instruction */
 622
 623         for (;;) {
 624                 /* "the number of bytes to send is 256" */
 625                 int count = 256;
 626                 int remain = fw->size - sent;
 627
 628                 if (remain < count)
 629                         count = remain;
 630
 631                 /*
 632                  * "write the number of bytes to be sent to the I/O Command
 633                  * write length register"
 634                  */
 635                 if_cs_write16(card, IF_CS_CMD_LEN, count);
 636
 637                 /* "write this to I/O Command port register as 16 bit writes */
 638                 if (count)
 639                         if_cs_write16_rep(card, IF_CS_CMD,
 640                                 &fw->data[sent],
 641                                 count >> 1);
 642
 643                 /*
 644                  * "Assert the download over interrupt command in the Host
 645                  * status register"
 646                  */
 647                 if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
 648
 649                 /*
 650                  * "Assert the download over interrupt command in the Card
 651                  * interrupt case register"
 652                  */
 653                 if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
 654
 655                 /*
 656                  * "The host polls the Card Status register ... for 50 ms before
 657                  * declaring a failure"
 658                  */
 659                 ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
 660                         IF_CS_BIT_COMMAND);
 661                 if (ret < 0) {
 662                         pr_err("can't download helper at 0x%x, ret %d\n",
 663                                sent, ret);
 664                         goto done;
 665                 }
 666
 667                 if (count == 0)
 668                         break;
 669
 670                 sent += count;
 671         }
 672
 673 done:
 674         lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
 675         return ret;
 676 }
 677
 678
 679 static int if_cs_prog_real(struct if_cs_card *card, const struct firmware *fw)
 680 {
 681         int ret = 0;
 682         int retry = 0;
 683         int len = 0;
 684         int sent;
 685
 686         lbs_deb_enter(LBS_DEB_CS);
 687
 688         lbs_deb_cs("fw size %td\n", fw->size);
 689
 690         ret = if_cs_poll_while_fw_download(card, IF_CS_SQ_READ_LOW,
 691                 IF_CS_SQ_HELPER_OK);
 692         if (ret < 0) {
 693                 pr_err("helper firmware doesn't answer\n");
 694                 goto done;
 695         }
 696
 697         for (sent = 0; sent < fw->size; sent += len) {
 698                 len = if_cs_read16(card, IF_CS_SQ_READ_LOW);
 699                 if (len & 1) {
 700                         retry++;
 701                         pr_info("odd, need to retry this firmware block\n");
 702                 } else {
 703                         retry = 0;
 704                 }
 705
 706                 if (retry > 20) {
 707                         pr_err("could not download firmware\n");
 708                         ret = -ENODEV;
 709                         goto done;
 710                 }
 711                 if (retry) {
 712                         sent -= len;
 713                 }
 714
 715
 716                 if_cs_write16(card, IF_CS_CMD_LEN, len);
 717
 718                 if_cs_write16_rep(card, IF_CS_CMD,
 719                         &fw->data[sent],
 720                         (len+1) >> 1);
 721                 if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
 722                 if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
 723
 724                 ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
 725                         IF_CS_BIT_COMMAND);
 726                 if (ret < 0) {
 727                         pr_err("can't download firmware at 0x%x\n", sent);
 728                         goto done;
 729                 }
 730         }
 731
 732         ret = if_cs_poll_while_fw_download(card, IF_CS_SCRATCH, 0x5a);
 733         if (ret < 0)
 734                 pr_err("firmware download failed\n");
 735
 736 done:
 737         lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
 738         return ret;
 739 }
 740
 741 static void if_cs_prog_firmware(struct lbs_private *priv, int ret,
 742                                  const struct firmware *helper,
 743                                  const struct firmware *mainfw)
 744 {
 745         struct if_cs_card *card = priv->card;
 746
 747         if (ret) {
 748                 pr_err("failed to find firmware (%d)\n", ret);
 749                 return;
 750         }
 751
 752         /* Load the firmware */
 753         ret = if_cs_prog_helper(card, helper);
 754         if (ret == 0 && (card->model != MODEL_8305))
 755                 ret = if_cs_prog_real(card, mainfw);
 756         if (ret)
 757                 return;
 758
 759         /* Now actually get the IRQ */
 760         ret = request_irq(card->p_dev->irq, if_cs_interrupt,
 761                 IRQF_SHARED, DRV_NAME, card);
 762         if (ret) {
 763                 pr_err("error in request_irq\n");
 764                 return;
 765         }
 766
 767         /*
 768          * Clear any interrupt cause that happened while sending
 769          * firmware/initializing card
 770          */
 771         if_cs_write16(card, IF_CS_CARD_INT_CAUSE, IF_CS_BIT_MASK);
 772         if_cs_enable_ints(card);
 773
 774         /* And finally bring the card up */
 775         priv->fw_ready = 1;
 776         if (lbs_start_card(priv) != 0) {
 777                 pr_err("could not activate card\n");
 778                 free_irq(card->p_dev->irq, card);
 779         }
 780 }
 781
 782
 783 /********************************************************************/
 784 /* Callback functions for libertas.ko                               */
 785 /********************************************************************/
 786
 787 /* Send commands or data packets to the card */
 788 static int if_cs_host_to_card(struct lbs_private *priv,
 789         u8 type,
 790         u8 *buf,
 791         u16 nb)
 792 {
 793         int ret = -1;
 794
 795         lbs_deb_enter_args(LBS_DEB_CS, "type %d, bytes %d", type, nb);
 796
 797         switch (type) {
 798         case MVMS_DAT:
 799                 priv->dnld_sent = DNLD_DATA_SENT;
 800                 if_cs_send_data(priv, buf, nb);
 801                 ret = 0;
 802                 break;
 803         case MVMS_CMD:
 804                 priv->dnld_sent = DNLD_CMD_SENT;
 805                 ret = if_cs_send_cmd(priv, buf, nb);
 806                 break;
 807         default:
 808                 netdev_err(priv->dev, "%s: unsupported type %d\n",
 809                            __func__, type);
 810         }
 811
 812         lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
 813         return ret;
 814 }
 815
 816
 817 static void if_cs_release(struct pcmcia_device *p_dev)
 818 {
 819         struct if_cs_card *card = p_dev->priv;
 820
 821         lbs_deb_enter(LBS_DEB_CS);
 822
 823         free_irq(p_dev->irq, card);
 824         pcmcia_disable_device(p_dev);
 825         if (card->iobase)
 826                 ioport_unmap(card->iobase);
 827
 828         lbs_deb_leave(LBS_DEB_CS);
 829 }
 830
 831
 832 static int if_cs_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
 833 {
 834         p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 835         p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;
 836
 837         if (p_dev->resource[1]->end) {
 838                 pr_err("wrong CIS (check number of IO windows)\n");
 839                 return -ENODEV;
 840         }
 841
 842         /* This reserves IO space but doesn't actually enable it */
 843         return pcmcia_request_io(p_dev);
 844 }
 845
 846 static int if_cs_probe(struct pcmcia_device *p_dev)
 847 {
 848         int ret = -ENOMEM;
 849         unsigned int prod_id;
 850         struct lbs_private *priv;
 851         struct if_cs_card *card;
 852
 853         lbs_deb_enter(LBS_DEB_CS);
 854
 855         card = kzalloc(sizeof(struct if_cs_card), GFP_KERNEL);
 856         if (!card)
 857                 goto out;
 858
 859         card->p_dev = p_dev;
 860         p_dev->priv = card;
 861
 862         p_dev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 863
 864         if (pcmcia_loop_config(p_dev, if_cs_ioprobe, NULL)) {
 865                 pr_err("error in pcmcia_loop_config\n");
 866                 goto out1;
 867         }
 868
 869         /*
 870          * Allocate an interrupt line.  Note that this does not assign
 871          * a handler to the interrupt, unless the 'Handler' member of
 872          * the irq structure is initialized.
 873          */
 874         if (!p_dev->irq)
 875                 goto out1;
 876
 877         /* Initialize io access */
 878         card->iobase = ioport_map(p_dev->resource[0]->start,
 879                                 resource_size(p_dev->resource[0]));
 880         if (!card->iobase) {
 881                 pr_err("error in ioport_map\n");
 882                 ret = -EIO;
 883                 goto out1;
 884         }
 885
 886         ret = pcmcia_enable_device(p_dev);
 887         if (ret) {
 888                 pr_err("error in pcmcia_enable_device\n");
 889                 goto out2;
 890         }
 891
 892         /* Finally, report what we've done */
 893         lbs_deb_cs("irq %d, io %pR", p_dev->irq, p_dev->resource[0]);
 894
 895         /*
 896          * Most of the libertas cards can do unaligned register access, but some
 897          * weird ones cannot. That's especially true for the CF8305 card.
 898          */
 899         card->align_regs = false;
 900
 901         card->model = get_model(p_dev->manf_id, p_dev->card_id);
 902         if (card->model == MODEL_UNKNOWN) {
 903                 pr_err("unsupported manf_id 0x%04x / card_id 0x%04x\n",
 904                        p_dev->manf_id, p_dev->card_id);
 905                 ret = -ENODEV;
 906                 goto out2;
 907         }
 908
 909         /* Check if we have a current silicon */
 910         prod_id = if_cs_read8(card, IF_CS_PRODUCT_ID);
 911         if (card->model == MODEL_8305) {
 912                 card->align_regs = true;
 913                 if (prod_id < IF_CS_CF8305_B1_REV) {
 914                         pr_err("8305 rev B0 and older are not supported\n");
 915                         ret = -ENODEV;
 916                         goto out2;
 917                 }
 918         }
 919
 920         if ((card->model == MODEL_8381) && prod_id < IF_CS_CF8381_B3_REV) {
 921                 pr_err("8381 rev B2 and older are not supported\n");
 922                 ret = -ENODEV;
 923                 goto out2;
 924         }
 925
 926         if ((card->model == MODEL_8385) && prod_id < IF_CS_CF8385_B1_REV) {
 927                 pr_err("8385 rev B0 and older are not supported\n");
 928                 ret = -ENODEV;
 929                 goto out2;
 930         }
 931
 932         /* Make this card known to the libertas driver */
 933         priv = lbs_add_card(card, &p_dev->dev);
 934         if (!priv) {
 935                 ret = -ENOMEM;
 936                 goto out2;
 937         }
 938
 939         /* Set up fields in lbs_private */
 940         card->priv = priv;
 941         priv->card = card;
 942         priv->hw_host_to_card = if_cs_host_to_card;
 943         priv->enter_deep_sleep = NULL;
 944         priv->exit_deep_sleep = NULL;
 945         priv->reset_deep_sleep_wakeup = NULL;
 946
 947         /* Get firmware */
 948         ret = lbs_get_firmware_async(priv, &p_dev->dev, card->model, fw_table,
 949                                      if_cs_prog_firmware);
 950         if (ret) {
 951                 pr_err("failed to find firmware (%d)\n", ret);
 952                 goto out3;
 953         }
 954
 955         goto out;
 956
 957 out3:
 958         lbs_remove_card(priv);
 959 out2:
 960         ioport_unmap(card->iobase);
 961 out1:
 962         pcmcia_disable_device(p_dev);
 963 out:
 964         lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
 965         return ret;
 966 }
 967
 968
 969 static void if_cs_detach(struct pcmcia_device *p_dev)
 970 {
 971         struct if_cs_card *card = p_dev->priv;
 972
 973         lbs_deb_enter(LBS_DEB_CS);
 974
 975         lbs_stop_card(card->priv);
 976         lbs_remove_card(card->priv);
 977         if_cs_disable_ints(card);
 978         if_cs_release(p_dev);
 979         kfree(card);
 980
 981         lbs_deb_leave(LBS_DEB_CS);
 982 }
 983
 984
 985
 986 /********************************************************************/
 987 /* Module initialization                                            */
 988 /********************************************************************/
 989
 990 static const struct pcmcia_device_id if_cs_ids[] = {
 991         PCMCIA_DEVICE_MANF_CARD(CF8305_MANFID, CF8305_CARDID),
 992         PCMCIA_DEVICE_MANF_CARD(CF8381_MANFID, CF8381_CARDID),
 993         PCMCIA_DEVICE_MANF_CARD(CF8385_MANFID, CF8385_CARDID),
 994         /* NOTE: keep in sync with get_model() */
 995         PCMCIA_DEVICE_NULL,
 996 };
 997 MODULE_DEVICE_TABLE(pcmcia, if_cs_ids);
 998
 999 static struct pcmcia_driver lbs_driver = {
1000         .owner          = THIS_MODULE,
1001         .name           = DRV_NAME,
1002         .probe          = if_cs_probe,
1003         .remove         = if_cs_detach,
1004         .id_table       = if_cs_ids,
1005 };
1006 module_pcmcia_driver(lbs_driver);