drivers/net/wireless/orinoco/fw.c

   1 /* Firmware file reading and download helpers
   2  *
   3  * See copyright notice in main.c
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/slab.h>
   7 #include <linux/firmware.h>
   8 #include <linux/device.h>
   9 #include <linux/module.h>
  10
  11 #include "hermes.h"
  12 #include "hermes_dld.h"
  13 #include "orinoco.h"
  14
  15 #include "fw.h"
  16
  17 /* End markers (for Symbol firmware only) */
  18 #define TEXT_END        0x1A            /* End of text header */
  19
  20 struct fw_info {
  21         char *pri_fw;
  22         char *sta_fw;
  23         char *ap_fw;
  24         u32 pda_addr;
  25         u16 pda_size;
  26 };
  27
  28 static const struct fw_info orinoco_fw[] = {
  29         { NULL, "agere_sta_fw.bin", "agere_ap_fw.bin", 0x00390000, 1000 },
  30         { NULL, "prism_sta_fw.bin", "prism_ap_fw.bin", 0, 1024 },
  31         { "symbol_sp24t_prim_fw", "symbol_sp24t_sec_fw", NULL, 0x00003100, 512 }
  32 };
  33 MODULE_FIRMWARE("agere_sta_fw.bin");
  34 MODULE_FIRMWARE("agere_ap_fw.bin");
  35 MODULE_FIRMWARE("prism_sta_fw.bin");
  36 MODULE_FIRMWARE("prism_ap_fw.bin");
  37 MODULE_FIRMWARE("symbol_sp24t_prim_fw");
  38 MODULE_FIRMWARE("symbol_sp24t_sec_fw");
  39
  40 /* Structure used to access fields in FW
  41  * Make sure LE decoding macros are used
  42  */
  43 struct orinoco_fw_header {
  44         char hdr_vers[6];       /* ASCII string for header version */
  45         __le16 headersize;      /* Total length of header */
  46         __le32 entry_point;     /* NIC entry point */
  47         __le32 blocks;          /* Number of blocks to program */
  48         __le32 block_offset;    /* Offset of block data from eof header */
  49         __le32 pdr_offset;      /* Offset to PDR data from eof header */
  50         __le32 pri_offset;      /* Offset to primary plug data */
  51         __le32 compat_offset;   /* Offset to compatibility data*/
  52         char signature[0];      /* FW signature length headersize-20 */
  53 } __packed;
  54
  55 /* Check the range of various header entries. Return a pointer to a
  56  * description of the problem, or NULL if everything checks out. */
  57 static const char *validate_fw(const struct orinoco_fw_header *hdr, size_t len)
  58 {
  59         u16 hdrsize;
  60
  61         if (len < sizeof(*hdr))
  62                 return "image too small";
  63         if (memcmp(hdr->hdr_vers, "HFW", 3) != 0)
  64                 return "format not recognised";
  65
  66         hdrsize = le16_to_cpu(hdr->headersize);
  67         if (hdrsize > len)
  68                 return "bad headersize";
  69         if ((hdrsize + le32_to_cpu(hdr->block_offset)) > len)
  70                 return "bad block offset";
  71         if ((hdrsize + le32_to_cpu(hdr->pdr_offset)) > len)
  72                 return "bad PDR offset";
  73         if ((hdrsize + le32_to_cpu(hdr->pri_offset)) > len)
  74                 return "bad PRI offset";
  75         if ((hdrsize + le32_to_cpu(hdr->compat_offset)) > len)
  76                 return "bad compat offset";
  77
  78         /* TODO: consider adding a checksum or CRC to the firmware format */
  79         return NULL;
  80 }
  81
  82 #if defined(CONFIG_HERMES_CACHE_FW_ON_INIT) || defined(CONFIG_PM_SLEEP)
  83 static inline const struct firmware *
  84 orinoco_cached_fw_get(struct orinoco_private *priv, bool primary)
  85 {
  86         if (primary)
  87                 return priv->cached_pri_fw;
  88         else
  89                 return priv->cached_fw;
  90 }
  91 #else
  92 #define orinoco_cached_fw_get(priv, primary) (NULL)
  93 #endif
  94
  95 /* Download either STA or AP firmware into the card. */
  96 static int
  97 orinoco_dl_firmware(struct orinoco_private *priv,
  98                     const struct fw_info *fw,
  99                     int ap)
 100 {
 101         /* Plug Data Area (PDA) */
 102         __le16 *pda;
 103
 104         struct hermes *hw = &priv->hw;
 105         const struct firmware *fw_entry;
 106         const struct orinoco_fw_header *hdr;
 107         const unsigned char *first_block;
 108         const void *end;
 109         const char *firmware;
 110         const char *fw_err;
 111         struct device *dev = priv->dev;
 112         int err = 0;
 113
 114         pda = kzalloc(fw->pda_size, GFP_KERNEL);
 115         if (!pda)
 116                 return -ENOMEM;
 117
 118         if (ap)
 119                 firmware = fw->ap_fw;
 120         else
 121                 firmware = fw->sta_fw;
 122
 123         dev_dbg(dev, "Attempting to download firmware %s\n", firmware);
 124
 125         /* Read current plug data */
 126         err = hw->ops->read_pda(hw, pda, fw->pda_addr, fw->pda_size);
 127         dev_dbg(dev, "Read PDA returned %d\n", err);
 128         if (err)
 129                 goto free;
 130
 131         if (!orinoco_cached_fw_get(priv, false)) {
 132                 err = request_firmware(&fw_entry, firmware, priv->dev);
 133
 134                 if (err) {
 135                         dev_err(dev, "Cannot find firmware %s\n", firmware);
 136                         err = -ENOENT;
 137                         goto free;
 138                 }
 139         } else
 140                 fw_entry = orinoco_cached_fw_get(priv, false);
 141
 142         hdr = (const struct orinoco_fw_header *) fw_entry->data;
 143
 144         fw_err = validate_fw(hdr, fw_entry->size);
 145         if (fw_err) {
 146                 dev_warn(dev, "Invalid firmware image detected (%s). "
 147                          "Aborting download\n", fw_err);
 148                 err = -EINVAL;
 149                 goto abort;
 150         }
 151
 152         /* Enable aux port to allow programming */
 153         err = hw->ops->program_init(hw, le32_to_cpu(hdr->entry_point));
 154         dev_dbg(dev, "Program init returned %d\n", err);
 155         if (err != 0)
 156                 goto abort;
 157
 158         /* Program data */
 159         first_block = (fw_entry->data +
 160                        le16_to_cpu(hdr->headersize) +
 161                        le32_to_cpu(hdr->block_offset));
 162         end = fw_entry->data + fw_entry->size;
 163
 164         err = hermes_program(hw, first_block, end);
 165         dev_dbg(dev, "Program returned %d\n", err);
 166         if (err != 0)
 167                 goto abort;
 168
 169         /* Update production data */
 170         first_block = (fw_entry->data +
 171                        le16_to_cpu(hdr->headersize) +
 172                        le32_to_cpu(hdr->pdr_offset));
 173
 174         err = hermes_apply_pda_with_defaults(hw, first_block, end, pda,
 175                                              &pda[fw->pda_size / sizeof(*pda)]);
 176         dev_dbg(dev, "Apply PDA returned %d\n", err);
 177         if (err)
 178                 goto abort;
 179
 180         /* Tell card we've finished */
 181         err = hw->ops->program_end(hw);
 182         dev_dbg(dev, "Program end returned %d\n", err);
 183         if (err != 0)
 184                 goto abort;
 185
 186         /* Check if we're running */
 187         dev_dbg(dev, "hermes_present returned %d\n", hermes_present(hw));
 188
 189 abort:
 190         /* If we requested the firmware, release it. */
 191         if (!orinoco_cached_fw_get(priv, false))
 192                 release_firmware(fw_entry);
 193
 194 free:
 195         kfree(pda);
 196         return err;
 197 }
 198
 199 /*
 200  * Process a firmware image - stop the card, load the firmware, reset
 201  * the card and make sure it responds.  For the secondary firmware take
 202  * care of the PDA - read it and then write it on top of the firmware.
 203  */
 204 static int
 205 symbol_dl_image(struct orinoco_private *priv, const struct fw_info *fw,
 206                 const unsigned char *image, const void *end,
 207                 int secondary)
 208 {
 209         struct hermes *hw = &priv->hw;
 210         int ret = 0;
 211         const unsigned char *ptr;
 212         const unsigned char *first_block;
 213
 214         /* Plug Data Area (PDA) */
 215         __le16 *pda = NULL;
 216
 217         /* Binary block begins after the 0x1A marker */
 218         ptr = image;
 219         while (*ptr++ != TEXT_END);
 220         first_block = ptr;
 221
 222         /* Read the PDA from EEPROM */
 223         if (secondary) {
 224                 pda = kzalloc(fw->pda_size, GFP_KERNEL);
 225                 if (!pda)
 226                         return -ENOMEM;
 227
 228                 ret = hw->ops->read_pda(hw, pda, fw->pda_addr, fw->pda_size);
 229                 if (ret)
 230                         goto free;
 231         }
 232
 233         /* Stop the firmware, so that it can be safely rewritten */
 234         if (priv->stop_fw) {
 235                 ret = priv->stop_fw(priv, 1);
 236                 if (ret)
 237                         goto free;
 238         }
 239
 240         /* Program the adapter with new firmware */
 241         ret = hermes_program(hw, first_block, end);
 242         if (ret)
 243                 goto free;
 244
 245         /* Write the PDA to the adapter */
 246         if (secondary) {
 247                 size_t len = hermes_blocks_length(first_block, end);
 248                 ptr = first_block + len;
 249                 ret = hermes_apply_pda(hw, ptr, end, pda,
 250                                        &pda[fw->pda_size / sizeof(*pda)]);
 251                 kfree(pda);
 252                 if (ret)
 253                         return ret;
 254         }
 255
 256         /* Run the firmware */
 257         if (priv->stop_fw) {
 258                 ret = priv->stop_fw(priv, 0);
 259                 if (ret)
 260                         return ret;
 261         }
 262
 263         /* Reset hermes chip and make sure it responds */
 264         ret = hw->ops->init(hw);
 265
 266         /* hermes_reset() should return 0 with the secondary firmware */
 267         if (secondary && ret != 0)
 268                 return -ENODEV;
 269
 270         /* And this should work with any firmware */
 271         if (!hermes_present(hw))
 272                 return -ENODEV;
 273
 274         return 0;
 275
 276 free:
 277         kfree(pda);
 278         return ret;
 279 }
 280
 281
 282 /*
 283  * Download the firmware into the card, this also does a PCMCIA soft
 284  * reset on the card, to make sure it's in a sane state.
 285  */
 286 static int
 287 symbol_dl_firmware(struct orinoco_private *priv,
 288                    const struct fw_info *fw)
 289 {
 290         struct device *dev = priv->dev;
 291         int ret;
 292         const struct firmware *fw_entry;
 293
 294         if (!orinoco_cached_fw_get(priv, true)) {
 295                 if (request_firmware(&fw_entry, fw->pri_fw, priv->dev) != 0) {
 296                         dev_err(dev, "Cannot find firmware: %s\n", fw->pri_fw);
 297                         return -ENOENT;
 298                 }
 299         } else
 300                 fw_entry = orinoco_cached_fw_get(priv, true);
 301
 302         /* Load primary firmware */
 303         ret = symbol_dl_image(priv, fw, fw_entry->data,
 304                               fw_entry->data + fw_entry->size, 0);
 305
 306         if (!orinoco_cached_fw_get(priv, true))
 307                 release_firmware(fw_entry);
 308         if (ret) {
 309                 dev_err(dev, "Primary firmware download failed\n");
 310                 return ret;
 311         }
 312
 313         if (!orinoco_cached_fw_get(priv, false)) {
 314                 if (request_firmware(&fw_entry, fw->sta_fw, priv->dev) != 0) {
 315                         dev_err(dev, "Cannot find firmware: %s\n", fw->sta_fw);
 316                         return -ENOENT;
 317                 }
 318         } else
 319                 fw_entry = orinoco_cached_fw_get(priv, false);
 320
 321         /* Load secondary firmware */
 322         ret = symbol_dl_image(priv, fw, fw_entry->data,
 323                               fw_entry->data + fw_entry->size, 1);
 324         if (!orinoco_cached_fw_get(priv, false))
 325                 release_firmware(fw_entry);
 326         if (ret)
 327                 dev_err(dev, "Secondary firmware download failed\n");
 328
 329         return ret;
 330 }
 331
 332 int orinoco_download(struct orinoco_private *priv)
 333 {
 334         int err = 0;
 335         /* Reload firmware */
 336         switch (priv->firmware_type) {
 337         case FIRMWARE_TYPE_AGERE:
 338                 /* case FIRMWARE_TYPE_INTERSIL: */
 339                 err = orinoco_dl_firmware(priv,
 340                                           &orinoco_fw[priv->firmware_type], 0);
 341                 break;
 342
 343         case FIRMWARE_TYPE_SYMBOL:
 344                 err = symbol_dl_firmware(priv,
 345                                          &orinoco_fw[priv->firmware_type]);
 346                 break;
 347         case FIRMWARE_TYPE_INTERSIL:
 348                 break;
 349         }
 350         /* TODO: if we fail we probably need to reinitialise
 351          * the driver */
 352
 353         return err;
 354 }
 355
 356 #if defined(CONFIG_HERMES_CACHE_FW_ON_INIT) || defined(CONFIG_PM_SLEEP)
 357 void orinoco_cache_fw(struct orinoco_private *priv, int ap)
 358 {
 359         const struct firmware *fw_entry = NULL;
 360         const char *pri_fw;
 361         const char *fw;
 362
 363         pri_fw = orinoco_fw[priv->firmware_type].pri_fw;
 364         if (ap)
 365                 fw = orinoco_fw[priv->firmware_type].ap_fw;
 366         else
 367                 fw = orinoco_fw[priv->firmware_type].sta_fw;
 368
 369         if (pri_fw) {
 370                 if (request_firmware(&fw_entry, pri_fw, priv->dev) == 0)
 371                         priv->cached_pri_fw = fw_entry;
 372         }
 373
 374         if (fw) {
 375                 if (request_firmware(&fw_entry, fw, priv->dev) == 0)
 376                         priv->cached_fw = fw_entry;
 377         }
 378 }
 379
 380 void orinoco_uncache_fw(struct orinoco_private *priv)
 381 {
 382         if (priv->cached_pri_fw)
 383                 release_firmware(priv->cached_pri_fw);
 384         if (priv->cached_fw)
 385                 release_firmware(priv->cached_fw);
 386
 387         priv->cached_pri_fw = NULL;
 388         priv->cached_fw = NULL;
 389 }
 390 #endif