2 * This file is part of wl1271
4 * Copyright (C) 2009 Nokia Corporation
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
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.
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.
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
25 #include "wl1271_acx.h"
26 #include "wl1271_reg.h"
27 #include "wl1271_rx.h"
28 #include "wl1271_spi.h"
29 #include "wl1271_io.h"
31 static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
34 return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
38 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
41 return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
42 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
45 /* The values of this table must match the wl1271_rates[] array */
46 static u8 wl1271_rx_rate_to_idx[] = {
47 /* MCS rates are used only with 11n */
48 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
49 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
50 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
51 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
52 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
53 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
54 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
55 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
57 11, /* WL1271_RATE_54 */
58 10, /* WL1271_RATE_48 */
59 9, /* WL1271_RATE_36 */
60 8, /* WL1271_RATE_24 */
62 /* TI-specific rate */
63 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */
65 7, /* WL1271_RATE_18 */
66 6, /* WL1271_RATE_12 */
67 3, /* WL1271_RATE_11 */
68 5, /* WL1271_RATE_9 */
69 4, /* WL1271_RATE_6 */
70 2, /* WL1271_RATE_5_5 */
71 1, /* WL1271_RATE_2 */
75 /* The values of this table must match the wl1271_rates[] array */
76 static u8 wl1271_5_ghz_rx_rate_to_idx[] = {
77 /* MCS rates are used only with 11n */
78 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
79 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
80 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
81 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
82 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
83 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
84 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
85 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
87 7, /* WL1271_RATE_54 */
88 6, /* WL1271_RATE_48 */
89 5, /* WL1271_RATE_36 */
90 4, /* WL1271_RATE_24 */
92 /* TI-specific rate */
93 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */
95 3, /* WL1271_RATE_18 */
96 2, /* WL1271_RATE_12 */
97 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11 */
98 1, /* WL1271_RATE_9 */
99 0, /* WL1271_RATE_6 */
100 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5 */
101 WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2 */
102 WL1271_RX_RATE_UNSUPPORTED /* WL1271_RATE_1 */
105 static void wl1271_rx_status(struct wl1271 *wl,
106 struct wl1271_rx_descriptor *desc,
107 struct ieee80211_rx_status *status,
110 memset(status, 0, sizeof(struct ieee80211_rx_status));
112 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
113 WL1271_RX_DESC_BAND_BG) {
114 status->band = IEEE80211_BAND_2GHZ;
115 status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
116 } else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
117 WL1271_RX_DESC_BAND_A) {
118 status->band = IEEE80211_BAND_5GHZ;
119 status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
121 wl1271_warning("unsupported band 0x%x",
122 desc->flags & WL1271_RX_DESC_BAND_MASK);
124 if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
125 wl1271_warning("unsupported rate");
128 * FIXME: Add mactime handling. For IBSS (ad-hoc) we need to get the
129 * timestamp from the beacon (acx_tsf_info). In BSS mode (infra) we
130 * only need the mactime for monitor mode. For now the mactime is
131 * not valid, so RX_FLAG_TSFT should not be set
133 status->signal = desc->rssi;
136 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
137 * need to divide by two for now, but TI has been discussing about
138 * changing it. This needs to be rechecked.
140 status->noise = desc->rssi - (desc->snr >> 1);
142 status->freq = ieee80211_channel_to_frequency(desc->channel);
144 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
145 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
147 if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
148 status->flag |= RX_FLAG_DECRYPTED;
149 if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
150 status->flag |= RX_FLAG_MMIC_ERROR;
154 static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
156 struct ieee80211_rx_status rx_status;
157 struct wl1271_rx_descriptor *desc;
163 skb = __dev_alloc_skb(length, GFP_KERNEL);
165 wl1271_error("Couldn't allocate RX frame");
169 buf = skb_put(skb, length);
170 wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
172 /* the data read starts with the descriptor */
173 desc = (struct wl1271_rx_descriptor *) buf;
175 /* now we pull the descriptor out of the buffer */
176 skb_pull(skb, sizeof(*desc));
178 fc = (u16 *)skb->data;
179 if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
182 wl1271_rx_status(wl, desc, &rx_status, beacon);
184 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
185 beacon ? "beacon" : "");
187 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
188 ieee80211_rx_ni(wl->hw, skb);
191 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
193 struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
195 u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
196 u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
199 while (drv_rx_counter != fw_rx_counter) {
200 mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
201 buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
204 wl1271_warning("received empty data");
208 wl->rx_mem_pool_addr.addr = (mem_block << 8) +
209 le32_to_cpu(wl_mem_map->packet_memory_pool_start);
210 wl->rx_mem_pool_addr.addr_extra =
211 wl->rx_mem_pool_addr.addr + 4;
213 /* Choose the block we want to read */
214 wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
215 sizeof(wl->rx_mem_pool_addr), false);
217 wl1271_rx_handle_data(wl, buf_size);
220 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
221 wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);