Commit | Line | Data |
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f5fc0f86 LC |
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 | ||
5a0e3ad6 | 24 | #include <linux/gfp.h> |
95dac04f | 25 | #include <linux/sched.h> |
5a0e3ad6 | 26 | |
00d20100 | 27 | #include "wl12xx.h" |
0f4e3122 | 28 | #include "debug.h" |
00d20100 SL |
29 | #include "acx.h" |
30 | #include "reg.h" | |
31 | #include "rx.h" | |
9eb599e9 | 32 | #include "tx.h" |
00d20100 | 33 | #include "io.h" |
f5fc0f86 | 34 | |
4d56ad9c | 35 | static u8 wl12xx_rx_get_mem_block(struct wl12xx_fw_status *status, |
f5fc0f86 LC |
36 | u32 drv_rx_counter) |
37 | { | |
d0f63b20 LC |
38 | return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & |
39 | RX_MEM_BLOCK_MASK; | |
f5fc0f86 LC |
40 | } |
41 | ||
4d56ad9c EP |
42 | static u32 wl12xx_rx_get_buf_size(struct wl12xx_fw_status *status, |
43 | u32 drv_rx_counter) | |
f5fc0f86 | 44 | { |
d0f63b20 LC |
45 | return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & |
46 | RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; | |
f5fc0f86 LC |
47 | } |
48 | ||
4d56ad9c | 49 | static bool wl12xx_rx_get_unaligned(struct wl12xx_fw_status *status, |
0a1d3abc SL |
50 | u32 drv_rx_counter) |
51 | { | |
52 | /* Convert the value to bool */ | |
53 | return !!(le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & | |
54 | RX_BUF_UNALIGNED_PAYLOAD); | |
55 | } | |
56 | ||
f5fc0f86 LC |
57 | static void wl1271_rx_status(struct wl1271 *wl, |
58 | struct wl1271_rx_descriptor *desc, | |
59 | struct ieee80211_rx_status *status, | |
60 | u8 beacon) | |
61 | { | |
62 | memset(status, 0, sizeof(struct ieee80211_rx_status)); | |
63 | ||
6a2de93b | 64 | if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) |
0af0467f | 65 | status->band = IEEE80211_BAND_2GHZ; |
6a2de93b | 66 | else |
0af0467f | 67 | status->band = IEEE80211_BAND_5GHZ; |
6a2de93b | 68 | |
0af0467f | 69 | status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band); |
a4102645 | 70 | |
18357850 SL |
71 | /* 11n support */ |
72 | if (desc->rate <= CONF_HW_RXTX_RATE_MCS0) | |
73 | status->flag |= RX_FLAG_HT; | |
18357850 | 74 | |
f5fc0f86 LC |
75 | status->signal = desc->rssi; |
76 | ||
ece550d0 JL |
77 | /* |
78 | * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we | |
79 | * need to divide by two for now, but TI has been discussing about | |
80 | * changing it. This needs to be rechecked. | |
81 | */ | |
82 | wl->noise = desc->rssi - (desc->snr >> 1); | |
83 | ||
0af0467f JO |
84 | status->freq = ieee80211_channel_to_frequency(desc->channel, |
85 | status->band); | |
f5fc0f86 LC |
86 | |
87 | if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { | |
34c8e3d2 | 88 | u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; |
f5fc0f86 | 89 | |
34c8e3d2 AN |
90 | status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | |
91 | RX_FLAG_DECRYPTED; | |
92 | ||
93 | if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { | |
5d07b668 | 94 | status->flag |= RX_FLAG_MMIC_ERROR; |
34c8e3d2 AN |
95 | wl1271_warning("Michael MIC error"); |
96 | } | |
f5fc0f86 | 97 | } |
f5fc0f86 LC |
98 | } |
99 | ||
0a1d3abc | 100 | static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, |
9eb599e9 | 101 | bool unaligned, u8 *hlid) |
f5fc0f86 | 102 | { |
f5fc0f86 LC |
103 | struct wl1271_rx_descriptor *desc; |
104 | struct sk_buff *skb; | |
92fe9b5f | 105 | struct ieee80211_hdr *hdr; |
f5fc0f86 LC |
106 | u8 *buf; |
107 | u8 beacon = 0; | |
77ddaa10 | 108 | u8 is_data = 0; |
0a1d3abc | 109 | u8 reserved = unaligned ? NET_IP_ALIGN : 0; |
5c472148 | 110 | u16 seq_num; |
f5fc0f86 | 111 | |
93c5bb68 KV |
112 | /* |
113 | * In PLT mode we seem to get frames and mac80211 warns about them, | |
114 | * workaround this by not retrieving them at all. | |
115 | */ | |
3fcdab70 | 116 | if (unlikely(wl->plt)) |
1f37cbc9 | 117 | return -EINVAL; |
93c5bb68 | 118 | |
34c8e3d2 AN |
119 | /* the data read starts with the descriptor */ |
120 | desc = (struct wl1271_rx_descriptor *) data; | |
121 | ||
95dac04f IY |
122 | if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { |
123 | size_t len = length - sizeof(*desc); | |
124 | wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); | |
125 | wake_up_interruptible(&wl->fwlog_waitq); | |
126 | return 0; | |
127 | } | |
128 | ||
34c8e3d2 AN |
129 | switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { |
130 | /* discard corrupted packets */ | |
131 | case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: | |
132 | case WL1271_RX_DESC_DECRYPT_FAIL: | |
133 | wl1271_warning("corrupted packet in RX with status: 0x%x", | |
134 | desc->status & WL1271_RX_DESC_STATUS_MASK); | |
135 | return -EINVAL; | |
136 | case WL1271_RX_DESC_SUCCESS: | |
137 | case WL1271_RX_DESC_MIC_FAIL: | |
138 | break; | |
139 | default: | |
140 | wl1271_error("invalid RX descriptor status: 0x%x", | |
141 | desc->status & WL1271_RX_DESC_STATUS_MASK); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
0a1d3abc SL |
145 | /* skb length not included rx descriptor */ |
146 | skb = __dev_alloc_skb(length + reserved - sizeof(*desc), GFP_KERNEL); | |
f5fc0f86 LC |
147 | if (!skb) { |
148 | wl1271_error("Couldn't allocate RX frame"); | |
1f37cbc9 | 149 | return -ENOMEM; |
f5fc0f86 LC |
150 | } |
151 | ||
0a1d3abc SL |
152 | /* reserve the unaligned payload(if any) */ |
153 | skb_reserve(skb, reserved); | |
154 | ||
155 | buf = skb_put(skb, length - sizeof(*desc)); | |
f5fc0f86 | 156 | |
0a1d3abc SL |
157 | /* |
158 | * Copy packets from aggregation buffer to the skbs without rx | |
159 | * descriptor and with packet payload aligned care. In case of unaligned | |
160 | * packets copy the packets in offset of 2 bytes guarantee IP header | |
161 | * payload aligned to 4 bytes. | |
162 | */ | |
163 | memcpy(buf, data + sizeof(*desc), length - sizeof(*desc)); | |
9eb599e9 | 164 | *hlid = desc->hlid; |
f5fc0f86 | 165 | |
92fe9b5f EP |
166 | hdr = (struct ieee80211_hdr *)skb->data; |
167 | if (ieee80211_is_beacon(hdr->frame_control)) | |
f5fc0f86 | 168 | beacon = 1; |
77ddaa10 EP |
169 | if (ieee80211_is_data_present(hdr->frame_control)) |
170 | is_data = 1; | |
f5fc0f86 | 171 | |
58be4607 | 172 | wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); |
f5fc0f86 | 173 | |
5c472148 | 174 | seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; |
9eb599e9 | 175 | wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, |
a20a5b7e | 176 | skb->len - desc->pad_len, |
5c472148 | 177 | beacon ? "beacon" : "", |
9eb599e9 | 178 | seq_num, *hlid); |
f5fc0f86 | 179 | |
b9f2e39d JO |
180 | skb_trim(skb, skb->len - desc->pad_len); |
181 | ||
a620865e | 182 | skb_queue_tail(&wl->deferred_rx_queue, skb); |
92ef8960 | 183 | queue_work(wl->freezable_wq, &wl->netstack_work); |
1f37cbc9 | 184 | |
77ddaa10 | 185 | return is_data; |
f5fc0f86 LC |
186 | } |
187 | ||
4d56ad9c | 188 | void wl12xx_rx(struct wl1271 *wl, struct wl12xx_fw_status *status) |
f5fc0f86 LC |
189 | { |
190 | struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map; | |
9eb599e9 | 191 | unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; |
f5fc0f86 LC |
192 | u32 buf_size; |
193 | u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK; | |
194 | u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK; | |
1f37cbc9 | 195 | u32 rx_counter; |
f5fc0f86 | 196 | u32 mem_block; |
1f37cbc9 IY |
197 | u32 pkt_length; |
198 | u32 pkt_offset; | |
9eb599e9 | 199 | u8 hlid; |
0a1d3abc | 200 | bool unaligned = false; |
f5fc0f86 LC |
201 | |
202 | while (drv_rx_counter != fw_rx_counter) { | |
1f37cbc9 IY |
203 | buf_size = 0; |
204 | rx_counter = drv_rx_counter; | |
205 | while (rx_counter != fw_rx_counter) { | |
4d56ad9c | 206 | pkt_length = wl12xx_rx_get_buf_size(status, rx_counter); |
1f37cbc9 IY |
207 | if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE) |
208 | break; | |
209 | buf_size += pkt_length; | |
210 | rx_counter++; | |
211 | rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; | |
212 | } | |
f5fc0f86 LC |
213 | |
214 | if (buf_size == 0) { | |
215 | wl1271_warning("received empty data"); | |
216 | break; | |
217 | } | |
218 | ||
ae77eccf SL |
219 | if (wl->chip.id != CHIP_ID_1283_PG20) { |
220 | /* | |
221 | * Choose the block we want to read | |
222 | * For aggregated packets, only the first memory block | |
223 | * should be retrieved. The FW takes care of the rest. | |
224 | */ | |
4d56ad9c | 225 | mem_block = wl12xx_rx_get_mem_block(status, |
ae77eccf SL |
226 | drv_rx_counter); |
227 | ||
228 | wl->rx_mem_pool_addr.addr = (mem_block << 8) + | |
229 | le32_to_cpu(wl_mem_map->packet_memory_pool_start); | |
230 | ||
231 | wl->rx_mem_pool_addr.addr_extra = | |
232 | wl->rx_mem_pool_addr.addr + 4; | |
233 | ||
234 | wl1271_write(wl, WL1271_SLV_REG_DATA, | |
235 | &wl->rx_mem_pool_addr, | |
236 | sizeof(wl->rx_mem_pool_addr), false); | |
237 | } | |
1f37cbc9 IY |
238 | |
239 | /* Read all available packets at once */ | |
240 | wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, | |
241 | buf_size, true); | |
242 | ||
243 | /* Split data into separate packets */ | |
244 | pkt_offset = 0; | |
245 | while (pkt_offset < buf_size) { | |
4d56ad9c | 246 | pkt_length = wl12xx_rx_get_buf_size(status, |
1f37cbc9 | 247 | drv_rx_counter); |
0a1d3abc | 248 | |
4d56ad9c | 249 | unaligned = wl12xx_rx_get_unaligned(status, |
0a1d3abc SL |
250 | drv_rx_counter); |
251 | ||
fb2382c7 JO |
252 | /* |
253 | * the handle data call can only fail in memory-outage | |
254 | * conditions, in that case the received frame will just | |
255 | * be dropped. | |
256 | */ | |
77ddaa10 EP |
257 | if (wl1271_rx_handle_data(wl, |
258 | wl->aggr_buf + pkt_offset, | |
9eb599e9 EP |
259 | pkt_length, unaligned, |
260 | &hlid) == 1) { | |
f414218e LC |
261 | if (hlid < WL12XX_MAX_LINKS) |
262 | __set_bit(hlid, active_hlids); | |
263 | else | |
264 | WARN(1, | |
265 | "hlid exceeded WL12XX_MAX_LINKS " | |
266 | "(%d)\n", hlid); | |
9eb599e9 | 267 | } |
77ddaa10 | 268 | |
1f37cbc9 IY |
269 | wl->rx_counter++; |
270 | drv_rx_counter++; | |
271 | drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; | |
272 | pkt_offset += pkt_length; | |
273 | } | |
f5fc0f86 | 274 | } |
606ea9fa IY |
275 | |
276 | /* | |
277 | * Write the driver's packet counter to the FW. This is only required | |
278 | * for older hardware revisions | |
279 | */ | |
280 | if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION) | |
281 | wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter); | |
77ddaa10 | 282 | |
9eb599e9 | 283 | wl12xx_rearm_rx_streaming(wl, active_hlids); |
f5fc0f86 | 284 | } |