Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / 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_io.h"
31
32 static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
33                                   u32 drv_rx_counter)
34 {
35         return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
36                 RX_MEM_BLOCK_MASK;
37 }
38
39 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
40                                  u32 drv_rx_counter)
41 {
42         return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
43                 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
44 }
45
46 /* The values of this table must match the wl1271_rates[] array */
47 static u8 wl1271_rx_rate_to_idx[] = {
48         /* MCS rates are used only with 11n */
49         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
50         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
51         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
52         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
53         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
54         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
55         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
56         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
57
58         11,                         /* WL1271_RATE_54   */
59         10,                         /* WL1271_RATE_48   */
60         9,                          /* WL1271_RATE_36   */
61         8,                          /* WL1271_RATE_24   */
62
63         /* TI-specific rate */
64         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
65
66         7,                          /* WL1271_RATE_18   */
67         6,                          /* WL1271_RATE_12   */
68         3,                          /* WL1271_RATE_11   */
69         5,                          /* WL1271_RATE_9    */
70         4,                          /* WL1271_RATE_6    */
71         2,                          /* WL1271_RATE_5_5  */
72         1,                          /* WL1271_RATE_2    */
73         0                           /* WL1271_RATE_1    */
74 };
75
76 /* The values of this table must match the wl1271_rates[] array */
77 static u8 wl1271_5_ghz_rx_rate_to_idx[] = {
78         /* MCS rates are used only with 11n */
79         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
80         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
81         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
82         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
83         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
84         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
85         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
86         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
87
88         7,                          /* WL1271_RATE_54   */
89         6,                          /* WL1271_RATE_48   */
90         5,                          /* WL1271_RATE_36   */
91         4,                          /* WL1271_RATE_24   */
92
93         /* TI-specific rate */
94         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
95
96         3,                          /* WL1271_RATE_18   */
97         2,                          /* WL1271_RATE_12   */
98         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11   */
99         1,                          /* WL1271_RATE_9    */
100         0,                          /* WL1271_RATE_6    */
101         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5  */
102         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2    */
103         WL1271_RX_RATE_UNSUPPORTED  /* WL1271_RATE_1    */
104 };
105
106 static void wl1271_rx_status(struct wl1271 *wl,
107                              struct wl1271_rx_descriptor *desc,
108                              struct ieee80211_rx_status *status,
109                              u8 beacon)
110 {
111         memset(status, 0, sizeof(struct ieee80211_rx_status));
112
113         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
114             WL1271_RX_DESC_BAND_BG) {
115                 status->band = IEEE80211_BAND_2GHZ;
116                 status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
117         } else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
118                  WL1271_RX_DESC_BAND_A) {
119                 status->band = IEEE80211_BAND_5GHZ;
120                 status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
121         } else
122                 wl1271_warning("unsupported band 0x%x",
123                                desc->flags & WL1271_RX_DESC_BAND_MASK);
124
125         if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
126                 wl1271_warning("unsupported rate");
127
128         /*
129          * FIXME: Add mactime handling.  For IBSS (ad-hoc) we need to get the
130          * timestamp from the beacon (acx_tsf_info).  In BSS mode (infra) we
131          * only need the mactime for monitor mode.  For now the mactime is
132          * not valid, so RX_FLAG_TSFT should not be set
133          */
134         status->signal = desc->rssi;
135
136         /*
137          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
138          * need to divide by two for now, but TI has been discussing about
139          * changing it.  This needs to be rechecked.
140          */
141         status->noise = desc->rssi - (desc->snr >> 1);
142
143         status->freq = ieee80211_channel_to_frequency(desc->channel);
144
145         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
146                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
147
148                 if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
149                         status->flag |= RX_FLAG_DECRYPTED;
150                 if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
151                         status->flag |= RX_FLAG_MMIC_ERROR;
152         }
153 }
154
155 static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
156 {
157         struct ieee80211_rx_status rx_status;
158         struct wl1271_rx_descriptor *desc;
159         struct sk_buff *skb;
160         u16 *fc;
161         u8 *buf;
162         u8 beacon = 0;
163
164         /*
165          * In PLT mode we seem to get frames and mac80211 warns about them,
166          * workaround this by not retrieving them at all.
167          */
168         if (unlikely(wl->state == WL1271_STATE_PLT))
169                 return;
170
171         skb = __dev_alloc_skb(length, GFP_KERNEL);
172         if (!skb) {
173                 wl1271_error("Couldn't allocate RX frame");
174                 return;
175         }
176
177         buf = skb_put(skb, length);
178         wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
179
180         /* the data read starts with the descriptor */
181         desc = (struct wl1271_rx_descriptor *) buf;
182
183         /* now we pull the descriptor out of the buffer */
184         skb_pull(skb, sizeof(*desc));
185
186         fc = (u16 *)skb->data;
187         if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
188                 beacon = 1;
189
190         wl1271_rx_status(wl, desc, &rx_status, beacon);
191
192         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
193                      beacon ? "beacon" : "");
194
195         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
196         ieee80211_rx_ni(wl->hw, skb);
197 }
198
199 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
200 {
201         struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
202         u32 buf_size;
203         u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
204         u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
205         u32 mem_block;
206
207         while (drv_rx_counter != fw_rx_counter) {
208                 mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
209                 buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
210
211                 if (buf_size == 0) {
212                         wl1271_warning("received empty data");
213                         break;
214                 }
215
216                 wl->rx_mem_pool_addr.addr = (mem_block << 8) +
217                         le32_to_cpu(wl_mem_map->packet_memory_pool_start);
218                 wl->rx_mem_pool_addr.addr_extra =
219                         wl->rx_mem_pool_addr.addr + 4;
220
221                 /* Choose the block we want to read */
222                 wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
223                              sizeof(wl->rx_mem_pool_addr), false);
224
225                 wl1271_rx_handle_data(wl, buf_size);
226
227                 wl->rx_counter++;
228                 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
229         }
230
231         wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
232 }