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Commit | Line | Data |
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2f01a1f5 | 1 | /* |
80301cdc | 2 | * This file is part of wl1251 |
2f01a1f5 KV |
3 | * |
4 | * Copyright (c) 1998-2007 Texas Instruments Incorporated | |
5 | * Copyright (C) 2008 Nokia Corporation | |
6 | * | |
2f01a1f5 KV |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/skbuff.h> | |
5a0e3ad6 | 24 | #include <linux/gfp.h> |
2f01a1f5 KV |
25 | #include <net/mac80211.h> |
26 | ||
13674118 | 27 | #include "wl1251.h" |
9bc6772e KV |
28 | #include "reg.h" |
29 | #include "io.h" | |
30 | #include "rx.h" | |
31 | #include "cmd.h" | |
32 | #include "acx.h" | |
2f01a1f5 | 33 | |
80301cdc KV |
34 | static void wl1251_rx_header(struct wl1251 *wl, |
35 | struct wl1251_rx_descriptor *desc) | |
2f01a1f5 KV |
36 | { |
37 | u32 rx_packet_ring_addr; | |
38 | ||
39 | rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; | |
40 | if (wl->rx_current_buffer) | |
41 | rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; | |
42 | ||
0764de64 | 43 | wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); |
2f01a1f5 KV |
44 | } |
45 | ||
80301cdc KV |
46 | static void wl1251_rx_status(struct wl1251 *wl, |
47 | struct wl1251_rx_descriptor *desc, | |
2f01a1f5 KV |
48 | struct ieee80211_rx_status *status, |
49 | u8 beacon) | |
50 | { | |
ff25839b KV |
51 | u64 mactime; |
52 | int ret; | |
53 | ||
2f01a1f5 KV |
54 | memset(status, 0, sizeof(struct ieee80211_rx_status)); |
55 | ||
56 | status->band = IEEE80211_BAND_2GHZ; | |
57 | status->mactime = desc->timestamp; | |
58 | ||
59 | /* | |
60 | * The rx status timestamp is a 32 bits value while the TSF is a | |
61 | * 64 bits one. | |
62 | * For IBSS merging, TSF is mandatory, so we have to get it | |
63 | * somehow, so we ask for ACX_TSF_INFO. | |
64 | * That could be moved to the get_tsf() hook, but unfortunately, | |
65 | * this one must be atomic, while our SPI routines can sleep. | |
66 | */ | |
67 | if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { | |
80301cdc | 68 | ret = wl1251_acx_tsf_info(wl, &mactime); |
ff25839b KV |
69 | if (ret == 0) |
70 | status->mactime = mactime; | |
2f01a1f5 KV |
71 | } |
72 | ||
73 | status->signal = desc->rssi; | |
2f01a1f5 | 74 | |
19434148 JL |
75 | /* |
76 | * FIXME: guessing that snr needs to be divided by two, otherwise | |
77 | * the values don't make any sense | |
78 | */ | |
79 | wl->noise = desc->rssi - desc->snr / 2; | |
80 | ||
59eb21a6 BR |
81 | status->freq = ieee80211_channel_to_frequency(desc->channel, |
82 | status->band); | |
2f01a1f5 | 83 | |
f4bda337 | 84 | status->flag |= RX_FLAG_MACTIME_START; |
2f01a1f5 | 85 | |
4d09b537 | 86 | if (!wl->monitor_present && (desc->flags & RX_DESC_ENCRYPTION_MASK)) { |
2f01a1f5 KV |
87 | status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; |
88 | ||
89 | if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) | |
90 | status->flag |= RX_FLAG_DECRYPTED; | |
91 | ||
92 | if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) | |
93 | status->flag |= RX_FLAG_MMIC_ERROR; | |
94 | } | |
95 | ||
96 | if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) | |
97 | status->flag |= RX_FLAG_FAILED_FCS_CRC; | |
98 | ||
73b30dfe DG |
99 | switch (desc->rate) { |
100 | /* skip 1 and 12 Mbps because they have same value 0x0a */ | |
101 | case RATE_2MBPS: | |
102 | status->rate_idx = 1; | |
103 | break; | |
104 | case RATE_5_5MBPS: | |
105 | status->rate_idx = 2; | |
106 | break; | |
107 | case RATE_11MBPS: | |
108 | status->rate_idx = 3; | |
109 | break; | |
110 | case RATE_6MBPS: | |
111 | status->rate_idx = 4; | |
112 | break; | |
113 | case RATE_9MBPS: | |
114 | status->rate_idx = 5; | |
115 | break; | |
116 | case RATE_18MBPS: | |
117 | status->rate_idx = 7; | |
118 | break; | |
119 | case RATE_24MBPS: | |
120 | status->rate_idx = 8; | |
121 | break; | |
122 | case RATE_36MBPS: | |
123 | status->rate_idx = 9; | |
124 | break; | |
125 | case RATE_48MBPS: | |
126 | status->rate_idx = 10; | |
127 | break; | |
128 | case RATE_54MBPS: | |
129 | status->rate_idx = 11; | |
130 | break; | |
131 | } | |
132 | ||
133 | /* for 1 and 12 Mbps we have to check the modulation */ | |
134 | if (desc->rate == RATE_1MBPS) { | |
135 | if (!(desc->mod_pre & OFDM_RATE_BIT)) | |
136 | /* CCK -> RATE_1MBPS */ | |
137 | status->rate_idx = 0; | |
138 | else | |
139 | /* OFDM -> RATE_12MBPS */ | |
140 | status->rate_idx = 6; | |
141 | } | |
2f01a1f5 | 142 | |
73b30dfe DG |
143 | if (desc->mod_pre & SHORT_PREAMBLE_BIT) |
144 | status->flag |= RX_FLAG_SHORTPRE; | |
2f01a1f5 KV |
145 | } |
146 | ||
80301cdc KV |
147 | static void wl1251_rx_body(struct wl1251 *wl, |
148 | struct wl1251_rx_descriptor *desc) | |
2f01a1f5 KV |
149 | { |
150 | struct sk_buff *skb; | |
151 | struct ieee80211_rx_status status; | |
152 | u8 *rx_buffer, beacon = 0; | |
153 | u16 length, *fc; | |
154 | u32 curr_id, last_id_inc, rx_packet_ring_addr; | |
155 | ||
80301cdc | 156 | length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); |
2f01a1f5 KV |
157 | curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; |
158 | last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); | |
159 | ||
160 | if (last_id_inc != curr_id) { | |
80301cdc | 161 | wl1251_warning("curr ID:%d, last ID inc:%d", |
2f01a1f5 KV |
162 | curr_id, last_id_inc); |
163 | wl->rx_last_id = curr_id; | |
164 | } else { | |
165 | wl->rx_last_id = last_id_inc; | |
166 | } | |
167 | ||
168 | rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + | |
80301cdc | 169 | sizeof(struct wl1251_rx_descriptor) + 20; |
2f01a1f5 KV |
170 | if (wl->rx_current_buffer) |
171 | rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; | |
172 | ||
cdd1e9a9 | 173 | skb = __dev_alloc_skb(length, GFP_KERNEL); |
2f01a1f5 | 174 | if (!skb) { |
80301cdc | 175 | wl1251_error("Couldn't allocate RX frame"); |
2f01a1f5 KV |
176 | return; |
177 | } | |
178 | ||
179 | rx_buffer = skb_put(skb, length); | |
0764de64 | 180 | wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); |
2f01a1f5 | 181 | |
25985edc | 182 | /* The actual length doesn't include the target's alignment */ |
b6251243 | 183 | skb_trim(skb, desc->length - PLCP_HEADER_LENGTH); |
2f01a1f5 KV |
184 | |
185 | fc = (u16 *)skb->data; | |
186 | ||
187 | if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) | |
188 | beacon = 1; | |
189 | ||
80301cdc | 190 | wl1251_rx_status(wl, desc, &status, beacon); |
2f01a1f5 | 191 | |
80301cdc | 192 | wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, |
2f01a1f5 KV |
193 | beacon ? "beacon" : ""); |
194 | ||
f1d58c25 | 195 | memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); |
878283f1 | 196 | ieee80211_rx_ni(wl->hw, skb); |
2f01a1f5 KV |
197 | } |
198 | ||
80301cdc | 199 | static void wl1251_rx_ack(struct wl1251 *wl) |
2f01a1f5 KV |
200 | { |
201 | u32 data, addr; | |
202 | ||
203 | if (wl->rx_current_buffer) { | |
204 | addr = ACX_REG_INTERRUPT_TRIG_H; | |
205 | data = INTR_TRIG_RX_PROC1; | |
206 | } else { | |
207 | addr = ACX_REG_INTERRUPT_TRIG; | |
208 | data = INTR_TRIG_RX_PROC0; | |
209 | } | |
210 | ||
80301cdc | 211 | wl1251_reg_write32(wl, addr, data); |
2f01a1f5 KV |
212 | |
213 | /* Toggle buffer ring */ | |
214 | wl->rx_current_buffer = !wl->rx_current_buffer; | |
215 | } | |
216 | ||
217 | ||
80301cdc | 218 | void wl1251_rx(struct wl1251 *wl) |
2f01a1f5 | 219 | { |
80301cdc | 220 | struct wl1251_rx_descriptor *rx_desc; |
2f01a1f5 | 221 | |
80301cdc | 222 | if (wl->state != WL1251_STATE_ON) |
2f01a1f5 KV |
223 | return; |
224 | ||
4721213f KV |
225 | rx_desc = wl->rx_descriptor; |
226 | ||
2f01a1f5 | 227 | /* We first read the frame's header */ |
80301cdc | 228 | wl1251_rx_header(wl, rx_desc); |
2f01a1f5 KV |
229 | |
230 | /* Now we can read the body */ | |
80301cdc | 231 | wl1251_rx_body(wl, rx_desc); |
2f01a1f5 KV |
232 | |
233 | /* Finally, we need to ACK the RX */ | |
80301cdc | 234 | wl1251_rx_ack(wl); |
2f01a1f5 | 235 | } |