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 "wlcore.h"
28 #include "debug.h"
29 #include "acx.h"
30 #include "rx.h"
31 #include "tx.h"
32 #include "io.h"
33 #include "hw_ops.h"
34
35 /*
36 * TODO: this is here just for now, it must be removed when the data
37 * operations are in place.
38 */
39 #include "../wl12xx/reg.h"
40
wlcore_rx_get_buf_size(struct wl1271 * wl,u32 rx_pkt_desc)41 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
42 u32 rx_pkt_desc)
43 {
44 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
45 return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
46 ALIGNED_RX_BUF_SIZE_SHIFT;
47
48 return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
49 }
50
wlcore_rx_get_align_buf_size(struct wl1271 * wl,u32 pkt_len)51 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
52 {
53 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
54 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
55
56 return pkt_len;
57 }
58
wl1271_rx_status(struct wl1271 * wl,struct wl1271_rx_descriptor * desc,struct ieee80211_rx_status * status,u8 beacon)59 static void wl1271_rx_status(struct wl1271 *wl,
60 struct wl1271_rx_descriptor *desc,
61 struct ieee80211_rx_status *status,
62 u8 beacon)
63 {
64 memset(status, 0, sizeof(struct ieee80211_rx_status));
65
66 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
67 status->band = IEEE80211_BAND_2GHZ;
68 else
69 status->band = IEEE80211_BAND_5GHZ;
70
71 status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
72
73 /* 11n support */
74 if (desc->rate <= wl->hw_min_ht_rate)
75 status->flag |= RX_FLAG_HT;
76
77 /*
78 * Read the signal level and antenna diversity indication.
79 * The msb in the signal level is always set as it is a
80 * negative number.
81 * The antenna indication is the msb of the rssi.
82 */
83 status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
84 status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
85
86 /*
87 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
88 * need to divide by two for now, but TI has been discussing about
89 * changing it. This needs to be rechecked.
90 */
91 wl->noise = desc->rssi - (desc->snr >> 1);
92
93 status->freq = ieee80211_channel_to_frequency(desc->channel,
94 status->band);
95
96 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
97 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
98
99 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
100 RX_FLAG_DECRYPTED;
101
102 if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) {
103 status->flag |= RX_FLAG_MMIC_ERROR;
104 wl1271_warning("Michael MIC error. Desc: 0x%x",
105 desc_err_code);
106 }
107 }
108
109 if (beacon)
110 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
111 status->band);
112 }
113
wl1271_rx_handle_data(struct wl1271 * wl,u8 * data,u32 length,enum wl_rx_buf_align rx_align,u8 * hlid)114 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
115 enum wl_rx_buf_align rx_align, u8 *hlid)
116 {
117 struct wl1271_rx_descriptor *desc;
118 struct sk_buff *skb;
119 struct ieee80211_hdr *hdr;
120 u8 *buf;
121 u8 beacon = 0;
122 u8 is_data = 0;
123 u8 reserved = 0, offset_to_data = 0;
124 u16 seq_num;
125 u32 pkt_data_len;
126
127 /*
128 * In PLT mode we seem to get frames and mac80211 warns about them,
129 * workaround this by not retrieving them at all.
130 */
131 if (unlikely(wl->plt))
132 return -EINVAL;
133
134 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
135 if (!pkt_data_len) {
136 wl1271_error("Invalid packet arrived from HW. length %d",
137 length);
138 return -EINVAL;
139 }
140
141 if (rx_align == WLCORE_RX_BUF_UNALIGNED)
142 reserved = RX_BUF_ALIGN;
143 else if (rx_align == WLCORE_RX_BUF_PADDED)
144 offset_to_data = RX_BUF_ALIGN;
145
146 /* the data read starts with the descriptor */
147 desc = (struct wl1271_rx_descriptor *) data;
148
149 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
150 size_t len = length - sizeof(*desc);
151 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
152 wake_up_interruptible(&wl->fwlog_waitq);
153 return 0;
154 }
155
156 /* discard corrupted packets */
157 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
158 hdr = (void *)(data + sizeof(*desc) + offset_to_data);
159 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
160 desc->status & WL1271_RX_DESC_STATUS_MASK,
161 pkt_data_len);
162 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
163 min(pkt_data_len,
164 ieee80211_hdrlen(hdr->frame_control)));
165 return -EINVAL;
166 }
167
168 /* skb length not including rx descriptor */
169 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
170 if (!skb) {
171 wl1271_error("Couldn't allocate RX frame");
172 return -ENOMEM;
173 }
174
175 /* reserve the unaligned payload(if any) */
176 skb_reserve(skb, reserved);
177
178 buf = skb_put(skb, pkt_data_len);
179
180 /*
181 * Copy packets from aggregation buffer to the skbs without rx
182 * descriptor and with packet payload aligned care. In case of unaligned
183 * packets copy the packets in offset of 2 bytes guarantee IP header
184 * payload aligned to 4 bytes.
185 */
186 memcpy(buf, data + sizeof(*desc), pkt_data_len);
187 if (rx_align == WLCORE_RX_BUF_PADDED)
188 skb_pull(skb, RX_BUF_ALIGN);
189
190 *hlid = desc->hlid;
191
192 hdr = (struct ieee80211_hdr *)skb->data;
193 if (ieee80211_is_beacon(hdr->frame_control))
194 beacon = 1;
195 if (ieee80211_is_data_present(hdr->frame_control))
196 is_data = 1;
197
198 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
199 wlcore_hw_set_rx_csum(wl, desc, skb);
200
201 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
202 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
203 skb->len - desc->pad_len,
204 beacon ? "beacon" : "",
205 seq_num, *hlid);
206
207 skb_queue_tail(&wl->deferred_rx_queue, skb);
208 queue_work(wl->freezable_wq, &wl->netstack_work);
209
210 return is_data;
211 }
212
wlcore_rx(struct wl1271 * wl,struct wl_fw_status * status)213 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
214 {
215 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
216 u32 buf_size;
217 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
218 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
219 u32 rx_counter;
220 u32 pkt_len, align_pkt_len;
221 u32 pkt_offset, des;
222 u8 hlid;
223 enum wl_rx_buf_align rx_align;
224 int ret = 0;
225
226 while (drv_rx_counter != fw_rx_counter) {
227 buf_size = 0;
228 rx_counter = drv_rx_counter;
229 while (rx_counter != fw_rx_counter) {
230 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
231 pkt_len = wlcore_rx_get_buf_size(wl, des);
232 align_pkt_len = wlcore_rx_get_align_buf_size(wl,
233 pkt_len);
234 if (buf_size + align_pkt_len > wl->aggr_buf_size)
235 break;
236 buf_size += align_pkt_len;
237 rx_counter++;
238 rx_counter %= wl->num_rx_desc;
239 }
240
241 if (buf_size == 0) {
242 wl1271_warning("received empty data");
243 break;
244 }
245
246 /* Read all available packets at once */
247 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
248 ret = wlcore_hw_prepare_read(wl, des, buf_size);
249 if (ret < 0)
250 goto out;
251
252 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
253 buf_size, true);
254 if (ret < 0)
255 goto out;
256
257 /* Split data into separate packets */
258 pkt_offset = 0;
259 while (pkt_offset < buf_size) {
260 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
261 pkt_len = wlcore_rx_get_buf_size(wl, des);
262 rx_align = wlcore_hw_get_rx_buf_align(wl, des);
263
264 /*
265 * the handle data call can only fail in memory-outage
266 * conditions, in that case the received frame will just
267 * be dropped.
268 */
269 if (wl1271_rx_handle_data(wl,
270 wl->aggr_buf + pkt_offset,
271 pkt_len, rx_align,
272 &hlid) == 1) {
273 if (hlid < wl->num_links)
274 __set_bit(hlid, active_hlids);
275 else
276 WARN(1,
277 "hlid (%d) exceeded MAX_LINKS\n",
278 hlid);
279 }
280
281 wl->rx_counter++;
282 drv_rx_counter++;
283 drv_rx_counter %= wl->num_rx_desc;
284 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
285 }
286 }
287
288 /*
289 * Write the driver's packet counter to the FW. This is only required
290 * for older hardware revisions
291 */
292 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
293 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
294 wl->rx_counter);
295 if (ret < 0)
296 goto out;
297 }
298
299 wl12xx_rearm_rx_streaming(wl, active_hlids);
300
301 out:
302 return ret;
303 }
304
305 #ifdef CONFIG_PM
wl1271_rx_filter_enable(struct wl1271 * wl,int index,bool enable,struct wl12xx_rx_filter * filter)306 int wl1271_rx_filter_enable(struct wl1271 *wl,
307 int index, bool enable,
308 struct wl12xx_rx_filter *filter)
309 {
310 int ret;
311
312 if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
313 wl1271_warning("Request to enable an already "
314 "enabled rx filter %d", index);
315 return 0;
316 }
317
318 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
319
320 if (ret) {
321 wl1271_error("Failed to %s rx data filter %d (err=%d)",
322 enable ? "enable" : "disable", index, ret);
323 return ret;
324 }
325
326 if (enable)
327 __set_bit(index, wl->rx_filter_enabled);
328 else
329 __clear_bit(index, wl->rx_filter_enabled);
330
331 return 0;
332 }
333
wl1271_rx_filter_clear_all(struct wl1271 * wl)334 int wl1271_rx_filter_clear_all(struct wl1271 *wl)
335 {
336 int i, ret = 0;
337
338 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
339 if (!test_bit(i, wl->rx_filter_enabled))
340 continue;
341 ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
342 if (ret)
343 goto out;
344 }
345
346 out:
347 return ret;
348 }
349 #endif /* CONFIG_PM */
350