2 * This file is part of wl1271
4 * Copyright (C) 2009 Nokia Corporation
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
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.
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.
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
24 #include <linux/gfp.h>
25 #include <linux/sched.h>
36 * TODO: this is here just for now, it must be removed when the data
37 * operations are in place.
39 #include "../wl12xx/reg.h"
41 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
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;
48 return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
51 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
53 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
54 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
59 static void wl1271_rx_status(struct wl1271 *wl,
60 struct wl1271_rx_descriptor *desc,
61 struct ieee80211_rx_status *status,
62 u8 beacon, u8 probe_rsp)
64 memset(status, 0, sizeof(struct ieee80211_rx_status));
66 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
67 status->band = NL80211_BAND_2GHZ;
69 status->band = NL80211_BAND_5GHZ;
71 status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
74 if (desc->rate <= wl->hw_min_ht_rate)
75 status->flag |= RX_FLAG_HT;
78 * Read the signal level and antenna diversity indication.
79 * The msb in the signal level is always set as it is a
81 * The antenna indication is the msb of the rssi.
83 status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
84 status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
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.
91 wl->noise = desc->rssi - (desc->snr >> 1);
93 status->freq = ieee80211_channel_to_frequency(desc->channel,
96 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
97 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
99 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
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",
109 if (beacon || probe_rsp)
110 status->boottime_ns = ktime_get_boot_ns();
113 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
117 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
118 enum wl_rx_buf_align rx_align, u8 *hlid)
120 struct wl1271_rx_descriptor *desc;
122 struct ieee80211_hdr *hdr;
126 u8 reserved = 0, offset_to_data = 0;
131 * In PLT mode we seem to get frames and mac80211 warns about them,
132 * workaround this by not retrieving them at all.
134 if (unlikely(wl->plt))
137 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
139 wl1271_error("Invalid packet arrived from HW. length %d",
144 if (rx_align == WLCORE_RX_BUF_UNALIGNED)
145 reserved = RX_BUF_ALIGN;
146 else if (rx_align == WLCORE_RX_BUF_PADDED)
147 offset_to_data = RX_BUF_ALIGN;
149 /* the data read starts with the descriptor */
150 desc = (struct wl1271_rx_descriptor *) data;
152 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
153 size_t len = length - sizeof(*desc);
154 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
158 /* discard corrupted packets */
159 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
160 hdr = (void *)(data + sizeof(*desc) + offset_to_data);
161 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
162 desc->status & WL1271_RX_DESC_STATUS_MASK,
164 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
166 ieee80211_hdrlen(hdr->frame_control)));
170 /* skb length not including rx descriptor */
171 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
173 wl1271_error("Couldn't allocate RX frame");
177 /* reserve the unaligned payload(if any) */
178 skb_reserve(skb, reserved);
180 buf = skb_put(skb, pkt_data_len);
183 * Copy packets from aggregation buffer to the skbs without rx
184 * descriptor and with packet payload aligned care. In case of unaligned
185 * packets copy the packets in offset of 2 bytes guarantee IP header
186 * payload aligned to 4 bytes.
188 memcpy(buf, data + sizeof(*desc), pkt_data_len);
189 if (rx_align == WLCORE_RX_BUF_PADDED)
190 skb_pull(skb, RX_BUF_ALIGN);
194 hdr = (struct ieee80211_hdr *)skb->data;
195 if (ieee80211_is_beacon(hdr->frame_control))
197 if (ieee80211_is_data_present(hdr->frame_control))
200 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon,
201 ieee80211_is_probe_resp(hdr->frame_control));
202 wlcore_hw_set_rx_csum(wl, desc, skb);
204 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
205 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
206 skb->len - desc->pad_len,
207 beacon ? "beacon" : "",
210 skb_queue_tail(&wl->deferred_rx_queue, skb);
211 queue_work(wl->freezable_wq, &wl->netstack_work);
216 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
218 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
220 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
221 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
223 u32 pkt_len, align_pkt_len;
226 enum wl_rx_buf_align rx_align;
229 /* update rates per link */
230 hlid = status->counters.hlid;
232 if (hlid < WLCORE_MAX_LINKS)
233 wl->links[hlid].fw_rate_mbps =
234 status->counters.tx_last_rate_mbps;
236 while (drv_rx_counter != fw_rx_counter) {
238 rx_counter = drv_rx_counter;
239 while (rx_counter != fw_rx_counter) {
240 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
241 pkt_len = wlcore_rx_get_buf_size(wl, des);
242 align_pkt_len = wlcore_rx_get_align_buf_size(wl,
244 if (buf_size + align_pkt_len > wl->aggr_buf_size)
246 buf_size += align_pkt_len;
248 rx_counter %= wl->num_rx_desc;
252 wl1271_warning("received empty data");
256 /* Read all available packets at once */
257 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
258 ret = wlcore_hw_prepare_read(wl, des, buf_size);
262 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
267 /* Split data into separate packets */
269 while (pkt_offset < buf_size) {
270 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
271 pkt_len = wlcore_rx_get_buf_size(wl, des);
272 rx_align = wlcore_hw_get_rx_buf_align(wl, des);
275 * the handle data call can only fail in memory-outage
276 * conditions, in that case the received frame will just
279 if (wl1271_rx_handle_data(wl,
280 wl->aggr_buf + pkt_offset,
283 if (hlid < wl->num_links)
284 __set_bit(hlid, active_hlids);
287 "hlid (%d) exceeded MAX_LINKS\n",
293 drv_rx_counter %= wl->num_rx_desc;
294 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
299 * Write the driver's packet counter to the FW. This is only required
300 * for older hardware revisions
302 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
303 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
309 wl12xx_rearm_rx_streaming(wl, active_hlids);
316 int wl1271_rx_filter_enable(struct wl1271 *wl,
317 int index, bool enable,
318 struct wl12xx_rx_filter *filter)
322 if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
323 wl1271_warning("Request to enable an already "
324 "enabled rx filter %d", index);
328 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
331 wl1271_error("Failed to %s rx data filter %d (err=%d)",
332 enable ? "enable" : "disable", index, ret);
337 __set_bit(index, wl->rx_filter_enabled);
339 __clear_bit(index, wl->rx_filter_enabled);
344 int wl1271_rx_filter_clear_all(struct wl1271 *wl)
348 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
349 if (!test_bit(i, wl->rx_filter_enabled))
351 ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
359 #endif /* CONFIG_PM */