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, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include "carl9170.h"
  26 #include "hostif.h"
  27 #include "printf.h"
  28 #include "wl.h"
  29 #include "io.h"
  30 #include "cam.h"
  31 #include "rf.h"
  32 #include "timer.h"
  33 #include "wol.h"
  34
  35 static bool length_check(struct dma_desc *desc)
  36 {
  37         volatile struct carl9170_tx_superframe *super = __get_super(desc);
  38
  39         if (unlikely(desc->totalLen < sizeof(struct carl9170_tx_superdesc)))
  40                 return false;
  41
  42         /*
  43          * check if the DMA is complete, or clipped.
  44          *
  45          * NB: The hardware aligns the descriptor length to
  46          * a 4 byte boundary. This makes the direct comparison
  47          * difficult, or unnecessary complex for a hot-path.
  48          */
  49         if (unlikely(super->s.len > desc->totalLen))
  50                 return false;
  51
  52         return true;
  53 }
  54
  55 static void handle_download(void)
  56 {
  57         struct dma_desc *desc;
  58
  59         /*
  60          * Under normal conditions, all completed descs should have
  61          * the AR9170_OWN_BITS_SE status flag set.
  62          * However there seems to be a undocumented case where the flag
  63          * is _SW ( handle_download_exception )
  64          */
  65
  66         for_each_desc_not_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
  67                 if (unlikely((length_check(desc) == false))) {
  68                         /*
  69                          * There is no easy way of telling what was lost.
  70                          *
  71                          * Therefore we just reclaim the data.
  72                          * The driver has to have some sort frame
  73                          * timeout mechanism.
  74                          */
  75
  76                         wlan_tx_complete(__get_super(desc), false);
  77                         dma_reclaim(&fw.pta.down_queue, desc);
  78                         down_trigger();
  79                 } else {
  80                         wlan_tx(desc);
  81                 }
  82         }
  83
  84 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
  85         xorl(AR9170_GPIO_REG_PORT_DATA, 2);
  86 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
  87 }
  88
  89 static void handle_upload(void)
  90 {
  91         struct dma_desc *desc;
  92
  93         for_each_desc_not_bits(desc, &fw.pta.up_queue, AR9170_OWN_BITS_HW) {
  94                 /*
  95                  * BIG FAT NOTE:
  96                  *
  97                  * DO NOT compare the descriptor addresses.
  98                  */
  99                 if (DESC_PAYLOAD(desc) == (void *) &dma_mem.reserved.rsp) {
 100                         fw.usb.int_desc = desc;
 101                         fw.usb.int_desc_available = 1;
 102                 } else {
 103                         dma_reclaim(&fw.wlan.rx_queue, desc);
 104                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 105                 }
 106         }
 107
 108 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
 109         xorl(AR9170_GPIO_REG_PORT_DATA, 2);
 110 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
 111 }
 112
 113 static void handle_download_exception(void)
 114 {
 115         struct dma_desc *desc, *target;
 116
 117         /* actually, the queue should be stopped by now? */
 118         usb_stop_down_queue();
 119
 120         target = (void *)((get(AR9170_PTA_REG_DN_CURR_ADDRH) << 16) |
 121                   get(AR9170_PTA_REG_DN_CURR_ADDRL));
 122
 123         /*
 124          * Put "forgotten" packets from the head of the queue, back
 125          * to the current position
 126          */
 127         __while_desc_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
 128                 if (desc == target)
 129                         break;
 130
 131                 dma_reclaim(&fw.pta.down_queue,
 132                     dma_unlink_head(&fw.pta.down_queue));
 133         }
 134
 135         __for_each_desc_continue(desc, &fw.pta.down_queue) {
 136                 if ((desc->status & AR9170_OWN_BITS) == AR9170_OWN_BITS_SW)
 137                         dma_fix_downqueue(desc);
 138         }
 139
 140
 141         usb_start_down_queue();
 142
 143         down_trigger();
 144 }
 145
 146 /* handle interrupts from DMA chip */
 147 void handle_host_interface(void)
 148 {
 149         uint32_t pta_int;
 150
 151         pta_int = get(AR9170_PTA_REG_INT_FLAG);
 152
 153 #define HANDLER(intr, flag, func)                       \
 154         do {                                            \
 155                 if ((intr & flag) != 0) {               \
 156                         func();                         \
 157                 }                                       \
 158         } while (0)
 159
 160         HANDLER(pta_int, AR9170_PTA_INT_FLAG_DN, handle_download);
 161
 162         HANDLER(pta_int, AR9170_PTA_INT_FLAG_UP, handle_upload);
 163
 164         /* This is just guesswork and MAGIC */
 165         pta_int = get(AR9170_PTA_REG_DMA_STATUS);
 166         HANDLER(pta_int, 0x1, handle_download_exception);
 167
 168 #undef HANDLER
 169 }
 170
 171 void handle_cmd(struct carl9170_rsp *resp)
 172 {
 173         struct carl9170_cmd *cmd = &dma_mem.reserved.cmd.cmd;
 174         unsigned int i;
 175
 176         /* copies cmd, len and extra fields */
 177         resp->hdr.len = cmd->hdr.len;
 178         resp->hdr.cmd = cmd->hdr.cmd;
 179         resp->hdr.ext = cmd->hdr.ext;
 180         resp->hdr.seq |= cmd->hdr.seq;
 181
 182         switch (cmd->hdr.cmd & ~CARL9170_CMD_ASYNC_FLAG) {
 183         case CARL9170_CMD_RREG:
 184                 for (i = 0; i < (cmd->hdr.len / 4); i++)
 185                         resp->rreg_res.vals[i] = get(cmd->rreg.regs[i]);
 186                 break;
 187
 188         case CARL9170_CMD_WREG:
 189                 resp->hdr.len = 0;
 190                 for (i = 0; i < (cmd->hdr.len / 8); i++)
 191                         set(cmd->wreg.regs[i].addr, cmd->wreg.regs[i].val);
 192                 break;
 193
 194         case CARL9170_CMD_ECHO:
 195                 memcpy(resp->echo.vals, cmd->echo.vals, cmd->hdr.len);
 196                 break;
 197
 198         case CARL9170_CMD_SWRST:
 199 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
 200                 /*
 201                  * Command has no payload, so the response
 202                  * has no payload either.
 203                  * resp->hdr.len = 0;
 204                  */
 205                 fw.wlan.mac_reset = CARL9170_MAC_RESET_FORCE;
 206 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
 207                 break;
 208
 209         case CARL9170_CMD_REBOOT:
 210                 /*
 211                  * resp->len = 0;
 212                  */
 213                 fw.reboot = 1;
 214                 break;
 215
 216         case CARL9170_CMD_READ_TSF:
 217                 resp->hdr.len = 8;
 218                 read_tsf((uint32_t *)resp->tsf.tsf);
 219                 break;
 220
 221         case CARL9170_CMD_RX_FILTER:
 222                 resp->hdr.len = 0;
 223                 fw.wlan.rx_filter = cmd->rx_filter.rx_filter;
 224                 break;
 225
 226         case CARL9170_CMD_WOL:
 227                 wol_cmd(&cmd->wol);
 228                 break;
 229
 230         case CARL9170_CMD_TALLY:
 231                 resp->hdr.len = sizeof(struct carl9170_tally_rsp);
 232                 memcpy(&resp->tally, &fw.tally, sizeof(struct carl9170_tally_rsp));
 233                 resp->tally.tick = fw.ticks_per_usec;
 234                 memset(&fw.tally, 0, sizeof(struct carl9170_tally_rsp));
 235                 break;
 236
 237         case CARL9170_CMD_WREGB:
 238                 resp->hdr.len = 0;
 239                 for (i = 0; i < MIN(cmd->wregb.count, cmd->hdr.len - 8); i++)
 240                         setb(cmd->wregb.addr + i, cmd->wregb.val[i]);
 241                 break;
 242
 243         case CARL9170_CMD_BCN_CTRL:
 244                 resp->hdr.len = 0;
 245
 246                 if (cmd->bcn_ctrl.mode & CARL9170_BCN_CTRL_CAB_TRIGGER) {
 247                         wlan_modify_beacon(cmd->bcn_ctrl.vif_id,
 248                                 cmd->bcn_ctrl.bcn_addr, cmd->bcn_ctrl.bcn_len);
 249                         set(AR9170_MAC_REG_BCN_ADDR, cmd->bcn_ctrl.bcn_addr);
 250                         set(AR9170_MAC_REG_BCN_LENGTH, cmd->bcn_ctrl.bcn_len);
 251                         set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
 252                 } else {
 253                         wlan_cab_flush_queue(cmd->bcn_ctrl.vif_id);
 254                         fw.wlan.cab_flush_trigger[cmd->bcn_ctrl.vif_id] = CARL9170_CAB_TRIGGER_EMPTY;
 255                 }
 256                 break;
 257
 258 #ifdef CONFIG_CARL9170FW_SECURITY_ENGINE
 259         case CARL9170_CMD_EKEY:
 260                 resp->hdr.len = 0;
 261                 set_key(&cmd->setkey);
 262                 break;
 263
 264         case CARL9170_CMD_DKEY:
 265                 resp->hdr.len = 0;
 266                 disable_key(&cmd->disablekey);
 267                 break;
 268 #endif /* CONFIG_CARL9170FW_SECURITY_ENGINE */
 269
 270 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 271         case CARL9170_CMD_FREQUENCY:
 272         case CARL9170_CMD_RF_INIT:
 273                 rf_cmd(cmd, resp);
 274                 break;
 275
 276         case CARL9170_CMD_FREQ_START:
 277                 /*
 278                  * resp->hdr.len = 0;
 279                  */
 280                 rf_notify_set_channel();
 281                 break;
 282
 283         case CARL9170_CMD_PSM:
 284                 resp->hdr.len = 0;
 285                 fw.phy.psm.state = le32_to_cpu(cmd->psm.state);
 286                 rf_psm();
 287                 break;
 288 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 289
 290         default:
 291                 BUG("Unknown command %x\n", cmd->hdr.cmd);
 292                 break;
 293         }
 294 }