2 * This file is part of wl1251
4 * Copyright (c) 1998-2007 Texas Instruments Incorporated
5 * Copyright (C) 2008 Nokia Corporation
7 * Contact: Kalle Valo <kalle.valo@nokia.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
25 #include <linux/skbuff.h>
26 #include <net/mac80211.h>
29 #include "wl1251_reg.h"
30 #include "wl1251_io.h"
31 #include "wl1251_rx.h"
32 #include "wl1251_cmd.h"
33 #include "wl1251_acx.h"
35 static void wl1251_rx_header(struct wl1251 *wl,
36 struct wl1251_rx_descriptor *desc)
38 u32 rx_packet_ring_addr;
40 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr;
41 if (wl->rx_current_buffer)
42 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
44 wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc));
47 static void wl1251_rx_status(struct wl1251 *wl,
48 struct wl1251_rx_descriptor *desc,
49 struct ieee80211_rx_status *status,
55 memset(status, 0, sizeof(struct ieee80211_rx_status));
57 status->band = IEEE80211_BAND_2GHZ;
58 status->mactime = desc->timestamp;
61 * The rx status timestamp is a 32 bits value while the TSF is a
63 * For IBSS merging, TSF is mandatory, so we have to get it
64 * somehow, so we ask for ACX_TSF_INFO.
65 * That could be moved to the get_tsf() hook, but unfortunately,
66 * this one must be atomic, while our SPI routines can sleep.
68 if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) {
69 ret = wl1251_acx_tsf_info(wl, &mactime);
71 status->mactime = mactime;
74 status->signal = desc->rssi;
77 * FIXME: guessing that snr needs to be divided by two, otherwise
78 * the values don't make any sense
80 status->noise = desc->rssi - desc->snr / 2;
82 status->freq = ieee80211_channel_to_frequency(desc->channel);
84 status->flag |= RX_FLAG_TSFT;
86 if (desc->flags & RX_DESC_ENCRYPTION_MASK) {
87 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
89 if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL)))
90 status->flag |= RX_FLAG_DECRYPTED;
92 if (unlikely(desc->flags & RX_DESC_MIC_FAIL))
93 status->flag |= RX_FLAG_MMIC_ERROR;
96 if (unlikely(!(desc->flags & RX_DESC_VALID_FCS)))
97 status->flag |= RX_FLAG_FAILED_FCS_CRC;
100 /* FIXME: set status->rate_idx */
103 static void wl1251_rx_body(struct wl1251 *wl,
104 struct wl1251_rx_descriptor *desc)
107 struct ieee80211_rx_status status;
108 u8 *rx_buffer, beacon = 0;
110 u32 curr_id, last_id_inc, rx_packet_ring_addr;
112 length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH);
113 curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT;
114 last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1);
116 if (last_id_inc != curr_id) {
117 wl1251_warning("curr ID:%d, last ID inc:%d",
118 curr_id, last_id_inc);
119 wl->rx_last_id = curr_id;
121 wl->rx_last_id = last_id_inc;
124 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr +
125 sizeof(struct wl1251_rx_descriptor) + 20;
126 if (wl->rx_current_buffer)
127 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
129 skb = dev_alloc_skb(length);
131 wl1251_error("Couldn't allocate RX frame");
135 rx_buffer = skb_put(skb, length);
136 wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length);
138 /* The actual lenght doesn't include the target's alignment */
139 skb->len = desc->length - PLCP_HEADER_LENGTH;
141 fc = (u16 *)skb->data;
143 if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
146 wl1251_rx_status(wl, desc, &status, beacon);
148 wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
149 beacon ? "beacon" : "");
151 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
152 ieee80211_rx_ni(wl->hw, skb);
155 static void wl1251_rx_ack(struct wl1251 *wl)
159 if (wl->rx_current_buffer) {
160 addr = ACX_REG_INTERRUPT_TRIG_H;
161 data = INTR_TRIG_RX_PROC1;
163 addr = ACX_REG_INTERRUPT_TRIG;
164 data = INTR_TRIG_RX_PROC0;
167 wl1251_reg_write32(wl, addr, data);
169 /* Toggle buffer ring */
170 wl->rx_current_buffer = !wl->rx_current_buffer;
174 void wl1251_rx(struct wl1251 *wl)
176 struct wl1251_rx_descriptor *rx_desc;
178 if (wl->state != WL1251_STATE_ON)
181 rx_desc = wl->rx_descriptor;
183 /* We first read the frame's header */
184 wl1251_rx_header(wl, rx_desc);
186 /* Now we can read the body */
187 wl1251_rx_body(wl, rx_desc);
189 /* Finally, we need to ACK the RX */