wl1271: remove unecessary qual parameter from rx status
[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 "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 status->rx_pkt_descs[drv_rx_counter] & RX_MEM_BLOCK_MASK;
34 }
35
36 static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
37                                  u32 drv_rx_counter)
38 {
39         return (status->rx_pkt_descs[drv_rx_counter] & RX_BUF_SIZE_MASK) >>
40                 RX_BUF_SIZE_SHIFT_DIV;
41 }
42
43 /* The values of this table must match the wl1271_rates[] array */
44 static u8 wl1271_rx_rate_to_idx[] = {
45         /* MCS rates are used only with 11n */
46         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
47         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
48         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
49         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
50         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
51         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
52         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
53         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
54
55         11,                         /* WL1271_RATE_54   */
56         10,                         /* WL1271_RATE_48   */
57         9,                          /* WL1271_RATE_36   */
58         8,                          /* WL1271_RATE_24   */
59
60         /* TI-specific rate */
61         WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */
62
63         7,                          /* WL1271_RATE_18   */
64         6,                          /* WL1271_RATE_12   */
65         3,                          /* WL1271_RATE_11   */
66         5,                          /* WL1271_RATE_9    */
67         4,                          /* WL1271_RATE_6    */
68         2,                          /* WL1271_RATE_5_5  */
69         1,                          /* WL1271_RATE_2    */
70         0                           /* WL1271_RATE_1    */
71 };
72
73 static void wl1271_rx_status(struct wl1271 *wl,
74                              struct wl1271_rx_descriptor *desc,
75                              struct ieee80211_rx_status *status,
76                              u8 beacon)
77 {
78         memset(status, 0, sizeof(struct ieee80211_rx_status));
79
80         if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
81                 status->band = IEEE80211_BAND_2GHZ;
82         else
83                 wl1271_warning("unsupported band 0x%x",
84                                desc->flags & WL1271_RX_DESC_BAND_MASK);
85
86         /*
87          * FIXME: Add mactime handling.  For IBSS (ad-hoc) we need to get the
88          * timestamp from the beacon (acx_tsf_info).  In BSS mode (infra) we
89          * only need the mactime for monitor mode.  For now the mactime is
90          * not valid, so RX_FLAG_TSFT should not be set
91          */
92         status->signal = desc->rssi;
93
94         /*
95          * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
96          * need to divide by two for now, but TI has been discussing about
97          * changing it.  This needs to be rechecked.
98          */
99         status->noise = desc->rssi - (desc->snr >> 1);
100
101         status->freq = ieee80211_channel_to_frequency(desc->channel);
102
103         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
104                 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
105
106                 if (likely(!(desc->flags & WL1271_RX_DESC_DECRYPT_FAIL)))
107                         status->flag |= RX_FLAG_DECRYPTED;
108
109                 if (unlikely(desc->flags & WL1271_RX_DESC_MIC_FAIL))
110                         status->flag |= RX_FLAG_MMIC_ERROR;
111         }
112
113         status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
114
115         if (status->rate_idx == WL1271_RX_RATE_UNSUPPORTED)
116                 wl1271_warning("unsupported rate");
117 }
118
119 static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
120 {
121         struct ieee80211_rx_status rx_status;
122         struct wl1271_rx_descriptor *desc;
123         struct sk_buff *skb;
124         u16 *fc;
125         u8 *buf;
126         u8 beacon = 0;
127
128         skb = dev_alloc_skb(length);
129         if (!skb) {
130                 wl1271_error("Couldn't allocate RX frame");
131                 return;
132         }
133
134         buf = skb_put(skb, length);
135         wl1271_spi_reg_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
136
137         /* the data read starts with the descriptor */
138         desc = (struct wl1271_rx_descriptor *) buf;
139
140         /* now we pull the descriptor out of the buffer */
141         skb_pull(skb, sizeof(*desc));
142
143         fc = (u16 *)skb->data;
144         if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
145                 beacon = 1;
146
147         wl1271_rx_status(wl, desc, &rx_status, beacon);
148
149         wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
150                      beacon ? "beacon" : "");
151
152         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
153         ieee80211_rx(wl->hw, skb);
154 }
155
156 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
157 {
158         struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
159         u32 buf_size;
160         u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
161         u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
162         u32 mem_block;
163
164         while (drv_rx_counter != fw_rx_counter) {
165                 mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
166                 buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
167
168                 if (buf_size == 0) {
169                         wl1271_warning("received empty data");
170                         break;
171                 }
172
173                 wl->rx_mem_pool_addr.addr =
174                         (mem_block << 8) + wl_mem_map->packet_memory_pool_start;
175                 wl->rx_mem_pool_addr.addr_extra =
176                         wl->rx_mem_pool_addr.addr + 4;
177
178                 /* Choose the block we want to read */
179                 wl1271_spi_reg_write(wl, WL1271_SLV_REG_DATA,
180                                      &wl->rx_mem_pool_addr,
181                                      sizeof(wl->rx_mem_pool_addr), false);
182
183                 wl1271_rx_handle_data(wl, buf_size);
184
185                 wl->rx_counter++;
186                 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
187         }
188
189         wl1271_reg_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
190
191         /* This is a workaround for some problems in the chip */
192         wl1271_reg_write32(wl, RX_DRIVER_DUMMY_WRITE_ADDRESS, 0x1);
193
194 }