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   1 /*
   2  * Intel Wireless Multicomm 3200 WiFi driver
   3  *
   4  * Copyright (C) 2009 Intel Corporation. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  *   * Redistributions of source code must retain the above copyright
  11  *     notice, this list of conditions and the following disclaimer.
  12  *   * Redistributions in binary form must reproduce the above copyright
  13  *     notice, this list of conditions and the following disclaimer in
  14  *     the documentation and/or other materials provided with the
  15  *     distribution.
  16  *   * Neither the name of Intel Corporation nor the names of its
  17  *     contributors may be used to endorse or promote products derived
  18  *     from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  *
  33  * Intel Corporation <ilw@linux.intel.com>
  34  * Samuel Ortiz <samuel.ortiz@intel.com>
  35  * Zhu Yi <yi.zhu@intel.com>
  36  *
  37  */
  38
  39 /*
  40  * Hardware Abstraction Layer for iwm.
  41  *
  42  * This file mostly defines an abstraction API for
  43  * sending various commands to the target.
  44  *
  45  * We have 2 types of commands: wifi and non-wifi ones.
  46  *
  47  * - wifi commands:
  48  *   They are used for sending LMAC and UMAC commands,
  49  *   and thus are the most commonly used ones.
  50  *   There are 2 different wifi command types, the regular
  51  *   one and the LMAC one. The former is used to send
  52  *   UMAC commands (see UMAC_CMD_OPCODE_* from umac.h)
  53  *   while the latter is used for sending commands to the
  54  *   LMAC. If you look at LMAC commands you'll se that they
  55  *   are actually regular iwlwifi target commands encapsulated
  56  *   into a special UMAC command called UMAC passthrough.
  57  *   This is due to the fact the the host talks exclusively
  58  *   to the UMAC and so there needs to be a special UMAC
  59  *   command for talking to the LMAC.
  60  *   This is how a wifi command is layed out:
  61  *    ------------------------
  62  *   | iwm_udma_out_wifi_hdr  |
  63  *    ------------------------
  64  *   | SW meta_data (32 bits) |
  65  *    ------------------------
  66  *   | iwm_dev_cmd_hdr        |
  67  *    ------------------------
  68  *   | payload                |
  69  *   | ....                   |
  70  *
  71  * - non-wifi, or general commands:
  72  *   Those commands are handled by the device's bootrom,
  73  *   and are typically sent when the UMAC and the LMAC
  74  *   are not yet available.
  75  *    *   This is how a non-wifi command is layed out:
  76  *    ---------------------------
  77  *   | iwm_udma_out_nonwifi_hdr  |
  78  *    ---------------------------
  79  *   | payload                   |
  80  *   | ....                      |
  81
  82  *
  83  * All the commands start with a UDMA header, which is
  84  * basically a 32 bits field. The 4 LSB there define
  85  * an opcode that allows the target to differentiate
  86  * between wifi (opcode is 0xf) and non-wifi commands
  87  * (opcode is [0..0xe]).
  88  *
  89  * When a command (wifi or non-wifi) is supposed to receive
  90  * an answer, we queue the command buffer. When we do receive
  91  * a command response from the UMAC, we go through the list
  92  * of pending command, and pass both the command and the answer
  93  * to the rx handler. Each command is sent with a unique
  94  * sequence id, and the answer is sent with the same one. This
  95  * is how we're supposed to match an answer with its command.
  96  * See rx.c:iwm_rx_handle_[non]wifi() and iwm_get_pending_[non]wifi()
  97  * for the implementation details.
  98  */
  99 #include <linux/kernel.h>
 100 #include <linux/netdevice.h>
 101
 102 #include "iwm.h"
 103 #include "bus.h"
 104 #include "hal.h"
 105 #include "umac.h"
 106 #include "debug.h"
 107
 108 static void iwm_nonwifi_cmd_init(struct iwm_priv *iwm,
 109                                  struct iwm_nonwifi_cmd *cmd,
 110                                  struct iwm_udma_nonwifi_cmd *udma_cmd)
 111 {
 112         INIT_LIST_HEAD(&cmd->pending);
 113
 114         spin_lock(&iwm->cmd_lock);
 115
 116         cmd->resp_received = 0;
 117
 118         cmd->seq_num = iwm->nonwifi_seq_num;
 119         udma_cmd->seq_num = cpu_to_le16(cmd->seq_num);
 120
 121         cmd->seq_num = iwm->nonwifi_seq_num++;
 122         iwm->nonwifi_seq_num %= UMAC_NONWIFI_SEQ_NUM_MAX;
 123
 124         if (udma_cmd->resp)
 125                 list_add_tail(&cmd->pending, &iwm->nonwifi_pending_cmd);
 126
 127         spin_unlock(&iwm->cmd_lock);
 128
 129         cmd->buf.start = cmd->buf.payload;
 130         cmd->buf.len = 0;
 131
 132         memcpy(&cmd->udma_cmd, udma_cmd, sizeof(*udma_cmd));
 133 }
 134
 135 u16 iwm_alloc_wifi_cmd_seq(struct iwm_priv *iwm)
 136 {
 137         u16 seq_num = iwm->wifi_seq_num;
 138
 139         iwm->wifi_seq_num++;
 140         iwm->wifi_seq_num %= UMAC_WIFI_SEQ_NUM_MAX;
 141
 142         return seq_num;
 143 }
 144
 145 static void iwm_wifi_cmd_init(struct iwm_priv *iwm,
 146                               struct iwm_wifi_cmd *cmd,
 147                               struct iwm_udma_wifi_cmd *udma_cmd,
 148                               struct iwm_umac_cmd *umac_cmd,
 149                               struct iwm_lmac_cmd *lmac_cmd,
 150                               u16 payload_size)
 151 {
 152         INIT_LIST_HEAD(&cmd->pending);
 153
 154         spin_lock(&iwm->cmd_lock);
 155
 156         cmd->seq_num = iwm_alloc_wifi_cmd_seq(iwm);
 157         umac_cmd->seq_num = cpu_to_le16(cmd->seq_num);
 158
 159         if (umac_cmd->resp)
 160                 list_add_tail(&cmd->pending, &iwm->wifi_pending_cmd);
 161
 162         spin_unlock(&iwm->cmd_lock);
 163
 164         cmd->buf.start = cmd->buf.payload;
 165         cmd->buf.len = 0;
 166
 167         if (lmac_cmd) {
 168                 cmd->buf.start -= sizeof(struct iwm_lmac_hdr);
 169
 170                 lmac_cmd->seq_num = cpu_to_le16(cmd->seq_num);
 171                 lmac_cmd->count = cpu_to_le16(payload_size);
 172
 173                 memcpy(&cmd->lmac_cmd, lmac_cmd, sizeof(*lmac_cmd));
 174
 175                 umac_cmd->count = cpu_to_le16(sizeof(struct iwm_lmac_hdr));
 176         } else
 177                 umac_cmd->count = 0;
 178
 179         umac_cmd->count = cpu_to_le16(payload_size +
 180                                       le16_to_cpu(umac_cmd->count));
 181         udma_cmd->count = cpu_to_le16(sizeof(struct iwm_umac_fw_cmd_hdr) +
 182                                       le16_to_cpu(umac_cmd->count));
 183
 184         memcpy(&cmd->udma_cmd, udma_cmd, sizeof(*udma_cmd));
 185         memcpy(&cmd->umac_cmd, umac_cmd, sizeof(*umac_cmd));
 186 }
 187
 188 void iwm_cmd_flush(struct iwm_priv *iwm)
 189 {
 190         struct iwm_wifi_cmd *wcmd, *wnext;
 191         struct iwm_nonwifi_cmd *nwcmd, *nwnext;
 192
 193         list_for_each_entry_safe(wcmd, wnext, &iwm->wifi_pending_cmd, pending) {
 194                 list_del(&wcmd->pending);
 195                 kfree(wcmd);
 196         }
 197
 198         list_for_each_entry_safe(nwcmd, nwnext, &iwm->nonwifi_pending_cmd,
 199                                  pending) {
 200                 list_del(&nwcmd->pending);
 201                 kfree(nwcmd);
 202         }
 203 }
 204
 205 struct iwm_wifi_cmd *iwm_get_pending_wifi_cmd(struct iwm_priv *iwm, u16 seq_num)
 206 {
 207         struct iwm_wifi_cmd *cmd, *next;
 208
 209         list_for_each_entry_safe(cmd, next, &iwm->wifi_pending_cmd, pending)
 210                 if (cmd->seq_num == seq_num) {
 211                         list_del(&cmd->pending);
 212                         return cmd;
 213                 }
 214
 215         return NULL;
 216 }
 217
 218 struct iwm_nonwifi_cmd *
 219 iwm_get_pending_nonwifi_cmd(struct iwm_priv *iwm, u8 seq_num, u8 cmd_opcode)
 220 {
 221         struct iwm_nonwifi_cmd *cmd, *next;
 222
 223         list_for_each_entry_safe(cmd, next, &iwm->nonwifi_pending_cmd, pending)
 224                 if ((cmd->seq_num == seq_num) &&
 225                     (cmd->udma_cmd.opcode == cmd_opcode) &&
 226                     (cmd->resp_received)) {
 227                         list_del(&cmd->pending);
 228                         return cmd;
 229                 }
 230
 231         return NULL;
 232 }
 233
 234 static void iwm_build_udma_nonwifi_hdr(struct iwm_priv *iwm,
 235                                        struct iwm_udma_out_nonwifi_hdr *hdr,
 236                                        struct iwm_udma_nonwifi_cmd *cmd)
 237 {
 238         memset(hdr, 0, sizeof(*hdr));
 239
 240         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_OPCODE, cmd->opcode);
 241         SET_VAL32(hdr->cmd, UDMA_HDI_OUT_NW_CMD_RESP, cmd->resp);
 242         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_EOT, 1);
 243         SET_VAL32(hdr->cmd, UDMA_HDI_OUT_NW_CMD_HANDLE_BY_HW,
 244                   cmd->handle_by_hw);
 245         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_SIGNATURE, UMAC_HDI_OUT_SIGNATURE);
 246         SET_VAL32(hdr->cmd, UDMA_HDI_OUT_CMD_NON_WIFI_HW_SEQ_NUM,
 247                   le16_to_cpu(cmd->seq_num));
 248
 249         hdr->addr = cmd->addr;
 250         hdr->op1_sz = cmd->op1_sz;
 251         hdr->op2 = cmd->op2;
 252 }
 253
 254 static int iwm_send_udma_nonwifi_cmd(struct iwm_priv *iwm,
 255                                      struct iwm_nonwifi_cmd *cmd)
 256 {
 257         struct iwm_udma_out_nonwifi_hdr *udma_hdr;
 258         struct iwm_nonwifi_cmd_buff *buf;
 259         struct iwm_udma_nonwifi_cmd *udma_cmd = &cmd->udma_cmd;
 260
 261         buf = &cmd->buf;
 262
 263         buf->start -= sizeof(struct iwm_umac_nonwifi_out_hdr);
 264         buf->len += sizeof(struct iwm_umac_nonwifi_out_hdr);
 265
 266         udma_hdr = (struct iwm_udma_out_nonwifi_hdr *)(buf->start);
 267
 268         iwm_build_udma_nonwifi_hdr(iwm, udma_hdr, udma_cmd);
 269
 270         IWM_DBG_CMD(iwm, DBG,
 271                     "Send UDMA nonwifi cmd: opcode = 0x%x, resp = 0x%x, "
 272                     "hw = 0x%x, seqnum = %d, addr = 0x%x, op1_sz = 0x%x, "
 273                     "op2 = 0x%x\n", udma_cmd->opcode, udma_cmd->resp,
 274                     udma_cmd->handle_by_hw, cmd->seq_num, udma_cmd->addr,
 275                     udma_cmd->op1_sz, udma_cmd->op2);
 276
 277         return iwm_bus_send_chunk(iwm, buf->start, buf->len);
 278 }
 279
 280 void iwm_udma_wifi_hdr_set_eop(struct iwm_priv *iwm, u8 *buf, u8 eop)
 281 {
 282         struct iwm_udma_out_wifi_hdr *hdr = (struct iwm_udma_out_wifi_hdr *)buf;
 283
 284         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_EOT, eop);
 285 }
 286
 287 void iwm_build_udma_wifi_hdr(struct iwm_priv *iwm,
 288                              struct iwm_udma_out_wifi_hdr *hdr,
 289                              struct iwm_udma_wifi_cmd *cmd)
 290 {
 291         memset(hdr, 0, sizeof(*hdr));
 292
 293         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_OPCODE, UMAC_HDI_OUT_OPCODE_WIFI);
 294         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_EOT, cmd->eop);
 295         SET_VAL32(hdr->cmd, UMAC_HDI_OUT_CMD_SIGNATURE, UMAC_HDI_OUT_SIGNATURE);
 296
 297         SET_VAL32(hdr->meta_data, UMAC_HDI_OUT_BYTE_COUNT,
 298                   le16_to_cpu(cmd->count));
 299         SET_VAL32(hdr->meta_data, UMAC_HDI_OUT_CREDIT_GRP, cmd->credit_group);
 300         SET_VAL32(hdr->meta_data, UMAC_HDI_OUT_RATID, cmd->ra_tid);
 301         SET_VAL32(hdr->meta_data, UMAC_HDI_OUT_LMAC_OFFSET, cmd->lmac_offset);
 302 }
 303
 304 void iwm_build_umac_hdr(struct iwm_priv *iwm,
 305                         struct iwm_umac_fw_cmd_hdr *hdr,
 306                         struct iwm_umac_cmd *cmd)
 307 {
 308         memset(hdr, 0, sizeof(*hdr));
 309
 310         SET_VAL32(hdr->meta_data, UMAC_FW_CMD_BYTE_COUNT,
 311                   le16_to_cpu(cmd->count));
 312         SET_VAL32(hdr->meta_data, UMAC_FW_CMD_TX_STA_COLOR, cmd->color);
 313         SET_VAL8(hdr->cmd.flags, UMAC_DEV_CMD_FLAGS_RESP_REQ, cmd->resp);
 314
 315         hdr->cmd.cmd = cmd->id;
 316         hdr->cmd.seq_num = cmd->seq_num;
 317 }
 318
 319 static int iwm_send_udma_wifi_cmd(struct iwm_priv *iwm,
 320                                   struct iwm_wifi_cmd *cmd)
 321 {
 322         struct iwm_umac_wifi_out_hdr *umac_hdr;
 323         struct iwm_wifi_cmd_buff *buf;
 324         struct iwm_udma_wifi_cmd *udma_cmd = &cmd->udma_cmd;
 325         struct iwm_umac_cmd *umac_cmd = &cmd->umac_cmd;
 326         int ret;
 327
 328         buf = &cmd->buf;
 329
 330         buf->start -= sizeof(struct iwm_umac_wifi_out_hdr);
 331         buf->len += sizeof(struct iwm_umac_wifi_out_hdr);
 332
 333         umac_hdr = (struct iwm_umac_wifi_out_hdr *)(buf->start);
 334
 335         iwm_build_udma_wifi_hdr(iwm, &umac_hdr->hw_hdr, udma_cmd);
 336         iwm_build_umac_hdr(iwm, &umac_hdr->sw_hdr, umac_cmd);
 337
 338         IWM_DBG_CMD(iwm, DBG,
 339                     "Send UDMA wifi cmd: opcode = 0x%x, UMAC opcode = 0x%x, "
 340                     "eop = 0x%x, count = 0x%x, credit_group = 0x%x, "
 341                     "ra_tid = 0x%x, lmac_offset = 0x%x, seqnum = %d\n",
 342                     UMAC_HDI_OUT_OPCODE_WIFI, umac_cmd->id,
 343                     udma_cmd->eop, udma_cmd->count, udma_cmd->credit_group,
 344                     udma_cmd->ra_tid, udma_cmd->lmac_offset, cmd->seq_num);
 345
 346         if (umac_cmd->id == UMAC_CMD_OPCODE_WIFI_PASS_THROUGH)
 347                 IWM_DBG_CMD(iwm, DBG, "\tLMAC opcode: 0x%x\n",
 348                             cmd->lmac_cmd.id);
 349
 350         ret = iwm_tx_credit_alloc(iwm, udma_cmd->credit_group, buf->len);
 351
 352         /* We keep sending UMAC reset regardless of the command credits.
 353          * The UMAC is supposed to be reset anyway and the Tx credits are
 354          * reinitialized afterwards. If we are lucky, the reset could
 355          * still be done even though we have run out of credits for the
 356          * command pool at this moment.*/
 357         if (ret && (umac_cmd->id != UMAC_CMD_OPCODE_RESET)) {
 358                 IWM_DBG_TX(iwm, DBG, "Failed to alloc tx credit for cmd %d\n",
 359                            umac_cmd->id);
 360                 return ret;
 361         }
 362
 363         return iwm_bus_send_chunk(iwm, buf->start, buf->len);
 364 }
 365
 366 /* target_cmd a.k.a udma_nonwifi_cmd can be sent when UMAC is not available */
 367 int iwm_hal_send_target_cmd(struct iwm_priv *iwm,
 368                             struct iwm_udma_nonwifi_cmd *udma_cmd,
 369                             const void *payload)
 370 {
 371         struct iwm_nonwifi_cmd *cmd;
 372         int ret;
 373
 374         cmd = kzalloc(sizeof(struct iwm_nonwifi_cmd), GFP_KERNEL);
 375         if (!cmd) {
 376                 IWM_ERR(iwm, "Couldn't alloc memory for hal cmd\n");
 377                 return -ENOMEM;
 378         }
 379
 380         iwm_nonwifi_cmd_init(iwm, cmd, udma_cmd);
 381
 382         if (cmd->udma_cmd.opcode == UMAC_HDI_OUT_OPCODE_WRITE ||
 383             cmd->udma_cmd.opcode == UMAC_HDI_OUT_OPCODE_WRITE_PERSISTENT) {
 384                 cmd->buf.len = le32_to_cpu(cmd->udma_cmd.op1_sz);
 385                 memcpy(&cmd->buf.payload, payload, cmd->buf.len);
 386         }
 387
 388         ret = iwm_send_udma_nonwifi_cmd(iwm, cmd);
 389
 390         if (!udma_cmd->resp)
 391                 kfree(cmd);
 392
 393         if (ret < 0)
 394                 return ret;
 395
 396         return cmd->seq_num;
 397 }
 398
 399 static void iwm_build_lmac_hdr(struct iwm_priv *iwm, struct iwm_lmac_hdr *hdr,
 400                                struct iwm_lmac_cmd *cmd)
 401 {
 402         memset(hdr, 0, sizeof(*hdr));
 403
 404         hdr->id = cmd->id;
 405         hdr->flags = 0; /* Is this ever used? */
 406         hdr->seq_num = cmd->seq_num;
 407 }
 408
 409 /*
 410  * iwm_hal_send_host_cmd(): sends commands to the UMAC or the LMAC.
 411  * Sending command to the LMAC is equivalent to sending a
 412  * regular UMAC command with the LMAC passtrough or the LMAC
 413  * wrapper UMAC command IDs.
 414  */
 415 int iwm_hal_send_host_cmd(struct iwm_priv *iwm,
 416                           struct iwm_udma_wifi_cmd *udma_cmd,
 417                           struct iwm_umac_cmd *umac_cmd,
 418                           struct iwm_lmac_cmd *lmac_cmd,
 419                           const void *payload, u16 payload_size)
 420 {
 421         struct iwm_wifi_cmd *cmd;
 422         struct iwm_lmac_hdr *hdr;
 423         int lmac_hdr_len = 0;
 424         int ret;
 425
 426         cmd = kzalloc(sizeof(struct iwm_wifi_cmd), GFP_KERNEL);
 427         if (!cmd) {
 428                 IWM_ERR(iwm, "Couldn't alloc memory for wifi hal cmd\n");
 429                 return -ENOMEM;
 430         }
 431
 432         iwm_wifi_cmd_init(iwm, cmd, udma_cmd, umac_cmd, lmac_cmd, payload_size);
 433
 434         if (lmac_cmd) {
 435                 hdr = (struct iwm_lmac_hdr *)(cmd->buf.start);
 436
 437                 iwm_build_lmac_hdr(iwm, hdr, &cmd->lmac_cmd);
 438                 lmac_hdr_len = sizeof(struct iwm_lmac_hdr);
 439         }
 440
 441         memcpy(cmd->buf.payload, payload, payload_size);
 442         cmd->buf.len = le16_to_cpu(umac_cmd->count);
 443
 444         ret = iwm_send_udma_wifi_cmd(iwm, cmd);
 445
 446         /* We free the cmd if we're not expecting any response */
 447         if (!umac_cmd->resp)
 448                 kfree(cmd);
 449         return ret;
 450 }
 451
 452 /*
 453  * iwm_hal_send_umac_cmd(): This is a special case for
 454  * iwm_hal_send_host_cmd() to send direct UMAC cmd (without
 455  * LMAC involved).
 456  */
 457 int iwm_hal_send_umac_cmd(struct iwm_priv *iwm,
 458                           struct iwm_udma_wifi_cmd *udma_cmd,
 459                           struct iwm_umac_cmd *umac_cmd,
 460                           const void *payload, u16 payload_size)
 461 {
 462         return iwm_hal_send_host_cmd(iwm, udma_cmd, umac_cmd, NULL,
 463                                      payload, payload_size);
 464 }