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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#include <linux/sched.h>
26
27#include "wl12xx.h"
28#include "acx.h"
29#include "reg.h"
30#include "rx.h"
31#include "io.h"
32
33static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status,
34 u32 drv_rx_counter)
35{
36 return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
37 RX_MEM_BLOCK_MASK;
38}
39
40static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status,
41 u32 drv_rx_counter)
42{
43 return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
44 RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
45}
46
47static void wl1271_rx_status(struct wl1271 *wl,
48 struct wl1271_rx_descriptor *desc,
49 struct ieee80211_rx_status *status,
50 u8 beacon)
51{
52 memset(status, 0, sizeof(struct ieee80211_rx_status));
53
54 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
55 status->band = IEEE80211_BAND_2GHZ;
56 else
57 status->band = IEEE80211_BAND_5GHZ;
58
59 status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band);
60
61#ifdef CONFIG_WL12XX_HT
62 /* 11n support */
63 if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
64 status->flag |= RX_FLAG_HT;
65#endif
66
67 status->signal = desc->rssi;
68
69 /*
70 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
71 * need to divide by two for now, but TI has been discussing about
72 * changing it. This needs to be rechecked.
73 */
74 wl->noise = desc->rssi - (desc->snr >> 1);
75
76 status->freq = ieee80211_channel_to_frequency(desc->channel,
77 status->band);
78
79 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
80 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
81
82 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
83 RX_FLAG_DECRYPTED;
84
85 if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
86 status->flag |= RX_FLAG_MMIC_ERROR;
87 wl1271_warning("Michael MIC error");
88 }
89 }
90}
91
92static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
93{
94 struct wl1271_rx_descriptor *desc;
95 struct sk_buff *skb;
96 struct ieee80211_hdr *hdr;
97 u8 *buf;
98 u8 beacon = 0;
99 u8 is_data = 0;
100
101 /*
102 * In PLT mode we seem to get frames and mac80211 warns about them,
103 * workaround this by not retrieving them at all.
104 */
105 if (unlikely(wl->state == WL1271_STATE_PLT))
106 return -EINVAL;
107
108 /* the data read starts with the descriptor */
109 desc = (struct wl1271_rx_descriptor *) data;
110
111 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
112 size_t len = length - sizeof(*desc);
113 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
114 wake_up_interruptible(&wl->fwlog_waitq);
115 return 0;
116 }
117
118 switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
119 /* discard corrupted packets */
120 case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
121 case WL1271_RX_DESC_DECRYPT_FAIL:
122 wl1271_warning("corrupted packet in RX with status: 0x%x",
123 desc->status & WL1271_RX_DESC_STATUS_MASK);
124 return -EINVAL;
125 case WL1271_RX_DESC_SUCCESS:
126 case WL1271_RX_DESC_MIC_FAIL:
127 break;
128 default:
129 wl1271_error("invalid RX descriptor status: 0x%x",
130 desc->status & WL1271_RX_DESC_STATUS_MASK);
131 return -EINVAL;
132 }
133
134 skb = __dev_alloc_skb(length, GFP_KERNEL);
135 if (!skb) {
136 wl1271_error("Couldn't allocate RX frame");
137 return -ENOMEM;
138 }
139
140 buf = skb_put(skb, length);
141 memcpy(buf, data, length);
142
143 /* now we pull the descriptor out of the buffer */
144 skb_pull(skb, sizeof(*desc));
145
146 hdr = (struct ieee80211_hdr *)skb->data;
147 if (ieee80211_is_beacon(hdr->frame_control))
148 beacon = 1;
149 if (ieee80211_is_data_present(hdr->frame_control))
150 is_data = 1;
151
152 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
153
154 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb,
155 skb->len - desc->pad_len,
156 beacon ? "beacon" : "");
157
158 skb_trim(skb, skb->len - desc->pad_len);
159
160 skb_queue_tail(&wl->deferred_rx_queue, skb);
161 queue_work(wl->freezable_wq, &wl->netstack_work);
162
163 return is_data;
164}
165
166void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
167{
168 struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
169 u32 buf_size;
170 u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
171 u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
172 u32 rx_counter;
173 u32 mem_block;
174 u32 pkt_length;
175 u32 pkt_offset;
176 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
177 bool had_data = false;
178
179 while (drv_rx_counter != fw_rx_counter) {
180 buf_size = 0;
181 rx_counter = drv_rx_counter;
182 while (rx_counter != fw_rx_counter) {
183 pkt_length = wl1271_rx_get_buf_size(status, rx_counter);
184 if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
185 break;
186 buf_size += pkt_length;
187 rx_counter++;
188 rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
189 }
190
191 if (buf_size == 0) {
192 wl1271_warning("received empty data");
193 break;
194 }
195
196 if (wl->chip.id != CHIP_ID_1283_PG20) {
197 /*
198 * Choose the block we want to read
199 * For aggregated packets, only the first memory block
200 * should be retrieved. The FW takes care of the rest.
201 */
202 mem_block = wl1271_rx_get_mem_block(status,
203 drv_rx_counter);
204
205 wl->rx_mem_pool_addr.addr = (mem_block << 8) +
206 le32_to_cpu(wl_mem_map->packet_memory_pool_start);
207
208 wl->rx_mem_pool_addr.addr_extra =
209 wl->rx_mem_pool_addr.addr + 4;
210
211 wl1271_write(wl, WL1271_SLV_REG_DATA,
212 &wl->rx_mem_pool_addr,
213 sizeof(wl->rx_mem_pool_addr), false);
214 }
215
216 /* Read all available packets at once */
217 wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
218 buf_size, true);
219
220 /* Split data into separate packets */
221 pkt_offset = 0;
222 while (pkt_offset < buf_size) {
223 pkt_length = wl1271_rx_get_buf_size(status,
224 drv_rx_counter);
225 /*
226 * the handle data call can only fail in memory-outage
227 * conditions, in that case the received frame will just
228 * be dropped.
229 */
230 if (wl1271_rx_handle_data(wl,
231 wl->aggr_buf + pkt_offset,
232 pkt_length) == 1)
233 had_data = true;
234
235 wl->rx_counter++;
236 drv_rx_counter++;
237 drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
238 pkt_offset += pkt_length;
239 }
240 }
241
242 /*
243 * Write the driver's packet counter to the FW. This is only required
244 * for older hardware revisions
245 */
246 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
247 wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
248
249 if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
250 (wl->conf.rx_streaming.always ||
251 test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
252 u32 timeout = wl->conf.rx_streaming.duration;
253
254 /* restart rx streaming */
255 if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
256 ieee80211_queue_work(wl->hw,
257 &wl->rx_streaming_enable_work);
258
259 mod_timer(&wl->rx_streaming_timer,
260 jiffies + msecs_to_jiffies(timeout));
261 }
262}
263
264void wl1271_set_default_filters(struct wl1271 *wl)
265{
266 if (wl->bss_type == BSS_TYPE_AP_BSS) {
267 wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG;
268 wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER;
269 } else {
270 wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG;
271 wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER;
272 }
273}