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 <linux/gfp.h>
  25
  26 #include "wl1271.h"
  27 #include "wl1271_acx.h"
  28 #include "wl1271_reg.h"
  29 #include "wl1271_rx.h"
  30 #include "wl1271_spi.h"
  31 #include "wl1271_io.h"
  32
  33 static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
  34                                   u32 drv_rx_counter)
  35 {
  36         return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  37                 RX_MEM_BLOCK_MASK;
  38 }
  39
  40 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
  41                                  u32 drv_rx_counter)
  42 {
  43         return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
  44                 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
  45 }
  46
  47 /* The values of this table must match the wl1271_rates[] array */
  48 static u8 wl1271_rx_rate_to_idx[] = {
  49         /* MCS rates are used only with 11n */
  50         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
  51         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
  52         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
  53         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
  54         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
  55         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
  56         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
  57         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
  58
  59         11,                         /* WL1271_RATE_54   */
  60         10,                         /* WL1271_RATE_48   */
  61         9,                          /* WL1271_RATE_36   */
  62         8,                          /* WL1271_RATE_24   */
  63
  64         /* TI-specific rate */
  65         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
  66
  67         7,                          /* WL1271_RATE_18   */
  68         6,                          /* WL1271_RATE_12   */
  69         3,                          /* WL1271_RATE_11   */
  70         5,                          /* WL1271_RATE_9    */
  71         4,                          /* WL1271_RATE_6    */
  72         2,                          /* WL1271_RATE_5_5  */
  73         1,                          /* WL1271_RATE_2    */
  74         0                           /* WL1271_RATE_1    */
  75 };
  76
  77 /* The values of this table must match the wl1271_rates[] array */
  78 static u8 wl1271_5_ghz_rx_rate_to_idx[] = {
  79         /* MCS rates are used only with 11n */
  80         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
  81         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
  82         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
  83         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
  84         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
  85         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
  86         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
  87         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
  88
  89         7,                          /* WL1271_RATE_54   */
  90         6,                          /* WL1271_RATE_48   */
  91         5,                          /* WL1271_RATE_36   */
  92         4,                          /* WL1271_RATE_24   */
  93
  94         /* TI-specific rate */
  95         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
  96
  97         3,                          /* WL1271_RATE_18   */
  98         2,                          /* WL1271_RATE_12   */
  99         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11   */
 100         1,                          /* WL1271_RATE_9    */
 101         0,                          /* WL1271_RATE_6    */
 102         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5  */
 103         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2    */
 104         WL1271_RX_RATE_UNSUPPORTED  /* WL1271_RATE_1    */
 105 };
 106
 107 static void wl1271_rx_status(struct wl1271 *wl,
 108                              struct wl1271_rx_descriptor *desc,
 109                              struct ieee80211_rx_status *status,
 110                              u8 beacon)
 111 {
 112         memset(status, 0, sizeof(struct ieee80211_rx_status));
 113
 114         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
 115             WL1271_RX_DESC_BAND_BG) {
 116                 status->band = IEEE80211_BAND_2GHZ;
 117                 status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
 118         } else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
 119                  WL1271_RX_DESC_BAND_A) {
 120                 status->band = IEEE80211_BAND_5GHZ;
 121                 status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
 122         } else
 123                 wl1271_warning("unsupported band 0x%x",
 124                                desc->flags & WL1271_RX_DESC_BAND_MASK);
 125
 126         if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
 127                 wl1271_warning("unsupported rate");
 128
 129         /*
 130          * FIXME: Add mactime handling.  For IBSS (ad-hoc) we need to get the
 131          * timestamp from the beacon (acx_tsf_info).  In BSS mode (infra) we
 132          * only need the mactime for monitor mode.  For now the mactime is
 133          * not valid, so RX_FLAG_TSFT should not be set
 134          */
 135         status->signal = desc->rssi;
 136
 137         /*
 138          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
 139          * need to divide by two for now, but TI has been discussing about
 140          * changing it.  This needs to be rechecked.
 141          */
 142         status->noise = desc->rssi - (desc->snr >> 1);
 143
 144         status->freq = ieee80211_channel_to_frequency(desc->channel);
 145
 146         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
 147                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
 148
 149                 if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
 150                         status->flag |= RX_FLAG_DECRYPTED;
 151                 if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
 152                         status->flag |= RX_FLAG_MMIC_ERROR;
 153         }
 154 }
 155
 156 static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
 157 {
 158         struct ieee80211_rx_status rx_status;
 159         struct wl1271_rx_descriptor *desc;
 160         struct sk_buff *skb;
 161         u16 *fc;
 162         u8 *buf;
 163         u8 beacon = 0;
 164
 165         skb = __dev_alloc_skb(length, GFP_KERNEL);
 166         if (!skb) {
 167                 wl1271_error("Couldn't allocate RX frame");
 168                 return;
 169         }
 170
 171         buf = skb_put(skb, length);
 172         wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
 173
 174         /* the data read starts with the descriptor */
 175         desc = (struct wl1271_rx_descriptor *) buf;
 176
 177         /* now we pull the descriptor out of the buffer */
 178         skb_pull(skb, sizeof(*desc));
 179
 180         fc = (u16 *)skb->data;
 181         if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
 182                 beacon = 1;
 183
 184         wl1271_rx_status(wl, desc, &rx_status, beacon);
 185
 186         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
 187                      beacon ? "beacon" : "");
 188
 189         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 190         ieee80211_rx_ni(wl->hw, skb);
 191 }
 192
 193 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
 194 {
 195         struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
 196         u32 buf_size;
 197         u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 198         u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 199         u32 mem_block;
 200
 201         while (drv_rx_counter != fw_rx_counter) {
 202                 mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
 203                 buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
 204
 205                 if (buf_size == 0) {
 206                         wl1271_warning("received empty data");
 207                         break;
 208                 }
 209
 210                 wl->rx_mem_pool_addr.addr = (mem_block << 8) +
 211                         le32_to_cpu(wl_mem_map->packet_memory_pool_start);
 212                 wl->rx_mem_pool_addr.addr_extra =
 213                         wl->rx_mem_pool_addr.addr + 4;
 214
 215                 /* Choose the block we want to read */
 216                 wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
 217                              sizeof(wl->rx_mem_pool_addr), false);
 218
 219                 wl1271_rx_handle_data(wl, buf_size);
 220
 221                 wl->rx_counter++;
 222                 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 223                 wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
 224         }
 225 }