drivers/net/wireless/wl12xx/wl1271_rx.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "wl1271.h"
  25 #include "wl1271_acx.h"
  26 #include "wl1271_reg.h"
  27 #include "wl1271_rx.h"
  28 #include "wl1271_spi.h"
  29
  30 static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
  31                                   u32 drv_rx_counter)
  32 {
  33         return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  34                 RX_MEM_BLOCK_MASK;
  35 }
  36
  37 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
  38                                  u32 drv_rx_counter)
  39 {
  40         return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  41                 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
  42 }
  43
  44 /* The values of this table must match the wl1271_rates[] array */
  45 static u8 wl1271_rx_rate_to_idx[] = {
  46         /* MCS rates are used only with 11n */
  47         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
  48         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
  49         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
  50         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
  51         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
  52         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
  53         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
  54         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
  55
  56         11,                         /* WL1271_RATE_54   */
  57         10,                         /* WL1271_RATE_48   */
  58         9,                          /* WL1271_RATE_36   */
  59         8,                          /* WL1271_RATE_24   */
  60
  61         /* TI-specific rate */
  62         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
  63
  64         7,                          /* WL1271_RATE_18   */
  65         6,                          /* WL1271_RATE_12   */
  66         3,                          /* WL1271_RATE_11   */
  67         5,                          /* WL1271_RATE_9    */
  68         4,                          /* WL1271_RATE_6    */
  69         2,                          /* WL1271_RATE_5_5  */
  70         1,                          /* WL1271_RATE_2    */
  71         0                           /* WL1271_RATE_1    */
  72 };
  73
  74 /* The values of this table must match the wl1271_rates[] array */
  75 static u8 wl1271_5_ghz_rx_rate_to_idx[] = {
  76         /* MCS rates are used only with 11n */
  77         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
  78         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
  79         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
  80         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
  81         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
  82         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
  83         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
  84         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
  85
  86         7,                          /* WL1271_RATE_54   */
  87         6,                          /* WL1271_RATE_48   */
  88         5,                          /* WL1271_RATE_36   */
  89         4,                          /* WL1271_RATE_24   */
  90
  91         /* TI-specific rate */
  92         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
  93
  94         3,                          /* WL1271_RATE_18   */
  95         2,                          /* WL1271_RATE_12   */
  96         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11   */
  97         1,                          /* WL1271_RATE_9    */
  98         0,                          /* WL1271_RATE_6    */
  99         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5  */
 100         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2    */
 101         WL1271_RX_RATE_UNSUPPORTED  /* WL1271_RATE_1    */
 102 };
 103
 104 static void wl1271_rx_status(struct wl1271 *wl,
 105                              struct wl1271_rx_descriptor *desc,
 106                              struct ieee80211_rx_status *status,
 107                              u8 beacon)
 108 {
 109         memset(status, 0, sizeof(struct ieee80211_rx_status));
 110
 111         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
 112             WL1271_RX_DESC_BAND_BG) {
 113                 status->band = IEEE80211_BAND_2GHZ;
 114                 status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
 115         } else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
 116                  WL1271_RX_DESC_BAND_A) {
 117                 status->band = IEEE80211_BAND_5GHZ;
 118                 status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
 119         } else
 120                 wl1271_warning("unsupported band 0x%x",
 121                                desc->flags & WL1271_RX_DESC_BAND_MASK);
 122
 123         if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
 124                 wl1271_warning("unsupported rate");
 125
 126         /*
 127          * FIXME: Add mactime handling.  For IBSS (ad-hoc) we need to get the
 128          * timestamp from the beacon (acx_tsf_info).  In BSS mode (infra) we
 129          * only need the mactime for monitor mode.  For now the mactime is
 130          * not valid, so RX_FLAG_TSFT should not be set
 131          */
 132         status->signal = desc->rssi;
 133
 134         /*
 135          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
 136          * need to divide by two for now, but TI has been discussing about
 137          * changing it.  This needs to be rechecked.
 138          */
 139         status->noise = desc->rssi - (desc->snr >> 1);
 140
 141         status->freq = ieee80211_channel_to_frequency(desc->channel);
 142
 143         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
 144                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
 145
 146                 if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
 147                         status->flag |= RX_FLAG_DECRYPTED;
 148                 if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
 149                         status->flag |= RX_FLAG_MMIC_ERROR;
 150         }
 151 }
 152
 153 static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
 154 {
 155         struct ieee80211_rx_status rx_status;
 156         struct wl1271_rx_descriptor *desc;
 157         struct sk_buff *skb;
 158         u16 *fc;
 159         u8 *buf;
 160         u8 beacon = 0;
 161
 162         skb = __dev_alloc_skb(length, GFP_KERNEL);
 163         if (!skb) {
 164                 wl1271_error("Couldn't allocate RX frame");
 165                 return;
 166         }
 167
 168         buf = skb_put(skb, length);
 169         wl1271_spi_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
 170
 171         /* the data read starts with the descriptor */
 172         desc = (struct wl1271_rx_descriptor *) buf;
 173
 174         /* now we pull the descriptor out of the buffer */
 175         skb_pull(skb, sizeof(*desc));
 176
 177         fc = (u16 *)skb->data;
 178         if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
 179                 beacon = 1;
 180
 181         wl1271_rx_status(wl, desc, &rx_status, beacon);
 182
 183         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
 184                      beacon ? "beacon" : "");
 185
 186         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 187         ieee80211_rx_ni(wl->hw, skb);
 188 }
 189
 190 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
 191 {
 192         struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
 193         u32 buf_size;
 194         u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 195         u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 196         u32 mem_block;
 197
 198         while (drv_rx_counter != fw_rx_counter) {
 199                 mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
 200                 buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
 201
 202                 if (buf_size == 0) {
 203                         wl1271_warning("received empty data");
 204                         break;
 205                 }
 206
 207                 wl->rx_mem_pool_addr.addr = (mem_block << 8) +
 208                         le32_to_cpu(wl_mem_map->packet_memory_pool_start);
 209                 wl->rx_mem_pool_addr.addr_extra =
 210                         wl->rx_mem_pool_addr.addr + 4;
 211
 212                 /* Choose the block we want to read */
 213                 wl1271_spi_write(wl, WL1271_SLV_REG_DATA,
 214                                  &wl->rx_mem_pool_addr,
 215                                  sizeof(wl->rx_mem_pool_addr), false);
 216
 217                 wl1271_rx_handle_data(wl, buf_size);
 218
 219                 wl->rx_counter++;
 220                 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 221         }
 222
 223         wl1271_spi_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
 224 }