carlfw/src/hostif.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * Host interface routines
   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, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "carl9170.h"
  27 #include "hostif.h"
  28 #include "printf.h"
  29 #include "wl.h"
  30 #include "io.h"
  31 #include "cam.h"
  32 #include "rf.h"
  33 #include "timer.h"
  34 #include "wol.h"
  35
  36 static bool length_check(struct dma_desc *desc)
  37 {
  38         volatile struct carl9170_tx_superframe *super = __get_super(desc);
  39
  40         if (unlikely(desc->totalLen < sizeof(struct carl9170_tx_superdesc)))
  41                 return false;
  42
  43         /*
  44          * check if the DMA is complete, or clipped.
  45          *
  46          * NB: The hardware aligns the descriptor length to
  47          * a 4 byte boundary. This makes the direct comparison
  48          * difficult, or unnecessary complex for a hot-path.
  49          */
  50         if (unlikely(super->s.len > desc->totalLen))
  51                 return false;
  52
  53         return true;
  54 }
  55
  56 static void handle_download(void)
  57 {
  58         struct dma_desc *desc;
  59
  60         /*
  61          * Under normal conditions, all completed descs should have
  62          * the AR9170_OWN_BITS_SE status flag set.
  63          * However there seems to be a undocumented case where the flag
  64          * is _SW ( handle_download_exception )
  65          */
  66
  67         for_each_desc_not_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
  68                 if (unlikely((length_check(desc) == false))) {
  69                         /*
  70                          * There is no easy way of telling what was lost.
  71                          *
  72                          * Therefore we just reclaim the data.
  73                          * The driver has to have some sort frame
  74                          * timeout mechanism.
  75                          */
  76
  77                         wlan_tx_complete(__get_super(desc), false);
  78                         dma_reclaim(&fw.pta.down_queue, desc);
  79                         down_trigger();
  80                 } else {
  81                         wlan_tx(desc);
  82                 }
  83         }
  84
  85 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
  86         xorl(AR9170_GPIO_REG_PORT_DATA, 2);
  87 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
  88 }
  89
  90 static void handle_upload(void)
  91 {
  92         struct dma_desc *desc;
  93
  94         for_each_desc_not_bits(desc, &fw.pta.up_queue, AR9170_OWN_BITS_HW) {
  95                 /*
  96                  * BIG FAT NOTE:
  97                  *
  98                  * DO NOT compare the descriptor addresses.
  99                  */
 100                 if (DESC_PAYLOAD(desc) == (void *) &dma_mem.reserved.rsp) {
 101                         fw.usb.int_desc = desc;
 102                         fw.usb.int_desc_available = 1;
 103                 } else {
 104                         dma_reclaim(&fw.wlan.rx_queue, desc);
 105                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 106                 }
 107         }
 108
 109 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
 110         xorl(AR9170_GPIO_REG_PORT_DATA, 2);
 111 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
 112 }
 113
 114 static void handle_download_exception(void)
 115 {
 116         struct dma_desc *desc, *target;
 117
 118         /* actually, the queue should be stopped by now? */
 119         usb_stop_down_queue();
 120
 121         target = (void *)((get(AR9170_PTA_REG_DN_CURR_ADDRH) << 16) |
 122                   get(AR9170_PTA_REG_DN_CURR_ADDRL));
 123
 124         /*
 125          * Put "forgotten" packets from the head of the queue, back
 126          * to the current position
 127          */
 128         __while_desc_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
 129                 if (desc == target)
 130                         break;
 131
 132                 dma_reclaim(&fw.pta.down_queue,
 133                     dma_unlink_head(&fw.pta.down_queue));
 134         }
 135
 136         __for_each_desc_continue(desc, &fw.pta.down_queue) {
 137                 if ((desc->status & AR9170_OWN_BITS) == AR9170_OWN_BITS_SW)
 138                         dma_fix_downqueue(desc);
 139         }
 140
 141
 142         usb_start_down_queue();
 143
 144         down_trigger();
 145 }
 146
 147 /* handle interrupts from DMA chip */
 148 void handle_host_interface(void)
 149 {
 150         uint32_t pta_int;
 151
 152         pta_int = get(AR9170_PTA_REG_INT_FLAG);
 153
 154 #define HANDLER(intr, flag, func)                       \
 155         do {                                            \
 156                 if ((intr & flag) != 0) {               \
 157                         func();                         \
 158                 }                                       \
 159         } while (0)
 160
 161         HANDLER(pta_int, AR9170_PTA_INT_FLAG_DN, handle_download);
 162
 163         HANDLER(pta_int, AR9170_PTA_INT_FLAG_UP, handle_upload);
 164
 165         /* This is just guesswork and MAGIC */
 166         pta_int = get(AR9170_PTA_REG_DMA_STATUS);
 167         HANDLER(pta_int, 0x1, handle_download_exception);
 168
 169 #undef HANDLER
 170 }
 171
 172 void handle_cmd(struct carl9170_rsp *resp)
 173 {
 174         struct carl9170_cmd *cmd = &dma_mem.reserved.cmd.cmd;
 175         unsigned int i;
 176
 177         /* copies cmd, len and extra fields */
 178         resp->hdr.len = cmd->hdr.len;
 179         resp->hdr.cmd = cmd->hdr.cmd;
 180         resp->hdr.ext = cmd->hdr.ext;
 181         resp->hdr.seq |= cmd->hdr.seq;
 182
 183         switch (cmd->hdr.cmd & ~CARL9170_CMD_ASYNC_FLAG) {
 184         case CARL9170_CMD_RREG:
 185                 for (i = 0; i < (cmd->hdr.len / 4); i++)
 186                         resp->rreg_res.vals[i] = get(cmd->rreg.regs[i]);
 187                 break;
 188
 189         case CARL9170_CMD_WREG:
 190                 resp->hdr.len = 0;
 191                 for (i = 0; i < (cmd->hdr.len / 8); i++)
 192                         set(cmd->wreg.regs[i].addr, cmd->wreg.regs[i].val);
 193                 break;
 194
 195         case CARL9170_CMD_ECHO:
 196                 memcpy(resp->echo.vals, cmd->echo.vals, cmd->hdr.len);
 197                 break;
 198
 199         case CARL9170_CMD_SWRST:
 200 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
 201                 /*
 202                  * Command has no payload, so the response
 203                  * has no payload either.
 204                  * resp->hdr.len = 0;
 205                  */
 206                 fw.wlan.mac_reset = CARL9170_MAC_RESET_FORCE;
 207 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
 208                 break;
 209
 210         case CARL9170_CMD_REBOOT:
 211                 /*
 212                  * resp->len = 0;
 213                  */
 214                 fw.reboot = 1;
 215                 break;
 216
 217         case CARL9170_CMD_READ_TSF:
 218                 resp->hdr.len = 8;
 219                 read_tsf((uint32_t *)resp->tsf.tsf);
 220                 break;
 221
 222         case CARL9170_CMD_RX_FILTER:
 223                 resp->hdr.len = 0;
 224                 fw.wlan.rx_filter = cmd->rx_filter.rx_filter;
 225                 break;
 226
 227         case CARL9170_CMD_WOL:
 228                 wol_cmd(&cmd->wol);
 229                 break;
 230
 231         case CARL9170_CMD_TALLY:
 232                 resp->hdr.len = sizeof(struct carl9170_tally_rsp);
 233                 memcpy(&resp->tally, &fw.tally, sizeof(struct carl9170_tally_rsp));
 234                 resp->tally.tick = fw.ticks_per_usec;
 235                 memset(&fw.tally, 0, sizeof(struct carl9170_tally_rsp));
 236                 break;
 237
 238         case CARL9170_CMD_BCN_CTRL:
 239                 resp->hdr.len = 0;
 240
 241                 if (cmd->bcn_ctrl.mode & CARL9170_BCN_CTRL_CAB_TRIGGER) {
 242                         wlan_modify_beacon(cmd->bcn_ctrl.vif_id,
 243                                 cmd->bcn_ctrl.bcn_addr, cmd->bcn_ctrl.bcn_len);
 244                         set(AR9170_MAC_REG_BCN_ADDR, cmd->bcn_ctrl.bcn_addr);
 245                         set(AR9170_MAC_REG_BCN_LENGTH, cmd->bcn_ctrl.bcn_len);
 246                         set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
 247                 } else {
 248                         wlan_cab_flush_queue(cmd->bcn_ctrl.vif_id);
 249                         fw.wlan.cab_flush_trigger[cmd->bcn_ctrl.vif_id] = CARL9170_CAB_TRIGGER_EMPTY;
 250                 }
 251                 break;
 252
 253 #ifdef CONFIG_CARL9170FW_SECURITY_ENGINE
 254         case CARL9170_CMD_EKEY:
 255                 resp->hdr.len = 0;
 256                 set_key(&cmd->setkey);
 257                 break;
 258
 259         case CARL9170_CMD_DKEY:
 260                 resp->hdr.len = 0;
 261                 disable_key(&cmd->disablekey);
 262                 break;
 263 #endif /* CONFIG_CARL9170FW_SECURITY_ENGINE */
 264
 265 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 266         case CARL9170_CMD_FREQUENCY:
 267         case CARL9170_CMD_RF_INIT:
 268                 rf_cmd(cmd, resp);
 269                 break;
 270
 271         case CARL9170_CMD_FREQ_START:
 272                 /*
 273                  * resp->hdr.len = 0;
 274                  */
 275                 rf_notify_set_channel();
 276                 break;
 277
 278         case CARL9170_CMD_PSM:
 279                 resp->hdr.len = 0;
 280                 fw.phy.psm.state = le32_to_cpu(cmd->psm.state);
 281                 rf_psm();
 282                 break;
 283 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 284
 285         default:
 286                 BUG("Unknown command %x\n", cmd->hdr.cmd);
 287                 break;
 288         }
 289 }