carl9170fw/carlfw/src/wlan.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * Interface to the WLAN part of the chip
   5  *
   6  * Copyright (c) 2000-2005 ZyDAS Technology Corporation
   7  * Copyright (c) 2007-2009 Atheros Communications, Inc.
   8  * Copyright    2009    Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2009-2012  Christian Lamparter <chunkeey@googlemail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include "carl9170.h"
  26 #include "shared/phy.h"
  27 #include "hostif.h"
  28 #include "timer.h"
  29 #include "wl.h"
  30 #include "printf.h"
  31 #include "rf.h"
  32 #include "linux/ieee80211.h"
  33 #include "wol.h"
  34
  35 #ifdef CONFIG_CARL9170FW_DEBUG
  36 static void wlan_dump_queue(unsigned int qidx)
  37 {
  38
  39         struct dma_desc *desc;
  40         struct carl9170_tx_superframe *super;
  41         int entries = 0;
  42
  43         __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
  44                 super = get_super(desc);
  45                 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
  46                     desc->status, desc->ctrl, desc->totalLen,
  47                     desc->dataSize, desc->nextAddr, desc->lastAddr);
  48
  49                 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
  50                     super->s.cookie, super->s.cnt, super->s.rix,
  51                     super->f.hdr.length, super->f.hdr.mac.set,
  52                     (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
  53                     super->f.data.i3e.frame_control);
  54
  55                 entries++;
  56         }
  57
  58         desc = (struct dma_desc *)get_wlan_txq_addr(qidx);
  59
  60         DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
  61             qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
  62             fw.wlan.tx_queue[qidx].head,
  63             desc, fw.wlan.tx_queue[qidx].terminator);
  64
  65         DBG("HW: t:%x s:%x ac:%x c:%x",
  66             (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
  67             (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
  68             (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
  69             (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
  70 }
  71 #endif /* CONFIG_CARL9170FW_DEBUG */
  72
  73 static void wlan_check_rx_overrun(void)
  74 {
  75         uint32_t overruns, total;
  76
  77         fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
  78         fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
  79         if (unlikely(overruns)) {
  80                 if (overruns == total) {
  81                         DBG("RX Overrun");
  82                         fw.wlan.mac_reset++;
  83                 }
  84
  85                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
  86         }
  87 }
  88
  89 static void handle_beacon_config(void)
  90 {
  91         uint32_t bcn_count;
  92
  93         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
  94         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
  95                          (uint8_t *) &bcn_count);
  96 }
  97
  98 static void handle_pretbtt(void)
  99 {
 100         fw.wlan.cab_flush_time = get_clock_counter();
 101
 102 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 103         rf_psm();
 104
 105         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 106                          (uint8_t *) &fw.phy.psm.state);
 107 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 108 }
 109
 110 static void handle_atim(void)
 111 {
 112         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 113 }
 114
 115 #ifdef CONFIG_CARL9170FW_DEBUG
 116 static void handle_qos(void)
 117 {
 118         /*
 119          * What is the QoS Bit used for?
 120          * Is it only an indicator for TXOP & Burst, or
 121          * should we do something here?
 122          */
 123 }
 124
 125 static void handle_radar(void)
 126 {
 127         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 128 }
 129 #endif /* CONFIG_CARL9170FW_DEBUG */
 130
 131 static void wlan_janitor(void)
 132 {
 133         wlan_send_buffered_cab();
 134
 135         wlan_send_buffered_tx_status();
 136
 137         wlan_send_buffered_ba();
 138
 139         wol_janitor();
 140 }
 141
 142 void handle_wlan(void)
 143 {
 144         uint32_t intr;
 145
 146         intr = get(AR9170_MAC_REG_INT_CTRL);
 147         /* ACK Interrupt */
 148         set(AR9170_MAC_REG_INT_CTRL, intr);
 149
 150 #define HANDLER(intr, flag, func)                       \
 151         do {                                            \
 152                 if ((intr & flag) != 0) {               \
 153                         func();                         \
 154                 }                                       \
 155         } while (0)
 156
 157         intr |= fw.wlan.soft_int;
 158         fw.wlan.soft_int = 0;
 159
 160         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
 161
 162         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
 163
 164         HANDLER(intr, AR9170_MAC_INT_RXC, handle_wlan_rx);
 165
 166         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
 167                 handle_wlan_tx_completion);
 168
 169 #ifdef CONFIG_CARL9170FW_DEBUG
 170         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
 171
 172         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
 173 #endif /* CONFIG_CARL9170FW_DEBUG */
 174
 175         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
 176
 177         if (unlikely(intr))
 178                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
 179
 180         wlan_janitor();
 181
 182 #undef HANDLER
 183 }
 184
 185 enum {
 186         CARL9170FW_TX_MAC_BUMP = 4,
 187         CARL9170FW_TX_MAC_DEBUG = 6,
 188         CARL9170FW_TX_MAC_RESET = 7,
 189 };
 190
 191 static void wlan_check_hang(void)
 192 {
 193         struct dma_desc *desc;
 194         int i;
 195
 196         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 197                 if (queue_empty(&fw.wlan.tx_queue[i])) {
 198                         /* Nothing to do here... move along */
 199                         continue;
 200                 }
 201
 202                 /* fetch the current DMA queue position */
 203                 desc = (struct dma_desc *)get_wlan_txq_addr(i);
 204
 205                 /* Stuck frame detection */
 206                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
 207                         fw.wlan.last_super_num[i]++;
 208
 209                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
 210                                 /*
 211                                  * schedule MAC reset (aka OFF/ON => dead)
 212                                  *
 213                                  * This will almost certainly kill
 214                                  * the device for good, but it's the
 215                                  * recommended thing to do...
 216                                  */
 217
 218                                 fw.wlan.mac_reset++;
 219                         }
 220
 221 #ifdef CONFIG_CARL9170FW_DEBUG
 222                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
 223                                 /*
 224                                  * Sigh, the queue is almost certainly
 225                                  * dead. Dump the queue content to the
 226                                  * user, maybe we find out why it got
 227                                  * so stuck.
 228                                  */
 229
 230                                 wlan_dump_queue(i);
 231                         }
 232 #endif /* CONFIG_CARL9170FW_DEBUG */
 233
 234 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
 235                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
 236                                 /*
 237                                  * Hrrm, bump the queue a bit.
 238                                  * maybe this will get it going again.
 239                                  */
 240
 241                                 wlan_dma_bump(i);
 242                                 wlan_trigger(BIT(i));
 243                         }
 244 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
 245                 } else {
 246                         /* Nothing stuck */
 247                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
 248                         fw.wlan.last_super_num[i] = 0;
 249                 }
 250         }
 251 }
 252
 253 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
 254 /*
 255  * NB: Resetting the MAC is a two-edged sword.
 256  * On most occasions, it does what it is supposed to do.
 257  * But there is a chance that this will make it
 258  * even worse and the radio dies silently.
 259  */
 260 static void wlan_mac_reset(void)
 261 {
 262         uint32_t val;
 263         uint32_t agg_wait_counter;
 264         uint32_t agg_density;
 265         uint32_t bcn_start_addr;
 266         uint32_t rctl, rcth;
 267         uint32_t cam_mode;
 268         uint32_t ack_power;
 269         uint32_t rts_cts_tpc;
 270         uint32_t rts_cts_rate;
 271         int i;
 272
 273 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 274         uint32_t rx_BB;
 275 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 276
 277 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
 278         INFO("MAC RESET");
 279 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
 280
 281         /* Save aggregation parameters */
 282         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
 283         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
 284
 285         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
 286
 287         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
 288         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
 289         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
 290
 291         ack_power = get(AR9170_MAC_REG_ACK_TPC);
 292         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
 293         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
 294
 295 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 296         /* 0x1c8960 write only */
 297         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
 298 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 299
 300         /* TX/RX must be stopped by now */
 301         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
 302
 303         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
 304
 305         /*
 306          * Manipulate CCA threshold to stop transmission
 307          *
 308          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
 309          */
 310
 311         /*
 312          * check Rx state in 0(idle) 9(disable)
 313          *
 314          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
 315          * while( (chState != 0) && (chState != 9)) {
 316          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
 317          * }
 318          */
 319
 320         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
 321
 322         delay(2);
 323
 324         /* Restore aggregation parameters */
 325         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
 326         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
 327
 328         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
 329         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
 330         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
 331         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
 332
 333         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
 334         set(AR9170_MAC_REG_ACK_TPC, ack_power);
 335         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
 336
 337 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 338         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
 339 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 340
 341         /*
 342          * Manipulate CCA threshold to resume transmission
 343          *
 344          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
 345          */
 346
 347         val = AR9170_DMA_TRIGGER_RXQ;
 348         /* Reinitialize all WLAN TX DMA queues. */
 349         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 350                 struct dma_desc *iter;
 351
 352                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
 353
 354                 /* kill the stuck frame */
 355                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
 356                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
 357                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
 358                         struct carl9170_tx_superframe *super = get_super(iter);
 359
 360                         iter->status = AR9170_OWN_BITS_SW;
 361                         /*
 362                          * Mark the frame as failed.
 363                          * The BAFAIL flag allows the frame to sail through
 364                          * wlan_tx_status without much "unstuck" trouble.
 365                          */
 366                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
 367                         iter->ctrl |= AR9170_CTRL_BAFAIL;
 368
 369                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
 370                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
 371
 372                         fw.wlan.last_super_num[i] = 0;
 373                         fw.wlan.last_super[i] = NULL;
 374                         iter = iter->lastAddr->nextAddr;
 375                 }
 376
 377                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
 378                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
 379                         val |= BIT(i);
 380
 381                 DBG("Q:%d l:%d h:%p t:%p cu:%p it:%p ct:%x st:%x\n", i, queue_len(&fw.wlan.tx_queue[i]),
 382                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
 383                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
 384         }
 385
 386         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
 387                             AR9170_MAC_INT_RETRY_FAIL;
 388
 389         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
 390         wlan_trigger(val);
 391 }
 392 #else
 393 static void wlan_mac_reset(void)
 394 {
 395         /* The driver takes care of reinitializing the device */
 396         BUG("MAC RESET");
 397 }
 398 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
 399
 400 void __cold wlan_timer(void)
 401 {
 402         unsigned int cached_mac_reset;
 403
 404         cached_mac_reset = fw.wlan.mac_reset;
 405
 406         /* TX Queue Hang check */
 407         wlan_check_hang();
 408
 409         /* RX Overrun check */
 410         wlan_check_rx_overrun();
 411
 412         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
 413                 wlan_mac_reset();
 414                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
 415         } else {
 416                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
 417                         fw.wlan.mac_reset--;
 418         }
 419 }