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-rw-r--r--drivers/net/wireless/wl12xx/rx.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/rx.c b/drivers/net/wireless/wl12xx/rx.c
new file mode 100644
index 000000000000..981ea259eb89
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/rx.c
@@ -0,0 +1,208 @@
1/*
2 * This file is part of wl12xx
3 *
4 * Copyright (c) 1998-2007 Texas Instruments Incorporated
5 * Copyright (C) 2008 Nokia Corporation
6 *
7 * Contact: Kalle Valo <kalle.valo@nokia.com>
8 *
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.
12 *
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.
17 *
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
21 * 02110-1301 USA
22 *
23 */
24
25#include <linux/skbuff.h>
26#include <net/mac80211.h>
27
28#include "wl12xx.h"
29#include "reg.h"
30#include "spi.h"
31#include "rx.h"
32
33static void wl12xx_rx_header(struct wl12xx *wl,
34 struct wl12xx_rx_descriptor *desc)
35{
36 u32 rx_packet_ring_addr;
37
38 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr;
39 if (wl->rx_current_buffer)
40 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
41
42 wl12xx_spi_mem_read(wl, rx_packet_ring_addr, desc,
43 sizeof(struct wl12xx_rx_descriptor));
44}
45
46static void wl12xx_rx_status(struct wl12xx *wl,
47 struct wl12xx_rx_descriptor *desc,
48 struct ieee80211_rx_status *status,
49 u8 beacon)
50{
51 memset(status, 0, sizeof(struct ieee80211_rx_status));
52
53 status->band = IEEE80211_BAND_2GHZ;
54 status->mactime = desc->timestamp;
55
56 /*
57 * The rx status timestamp is a 32 bits value while the TSF is a
58 * 64 bits one.
59 * For IBSS merging, TSF is mandatory, so we have to get it
60 * somehow, so we ask for ACX_TSF_INFO.
61 * That could be moved to the get_tsf() hook, but unfortunately,
62 * this one must be atomic, while our SPI routines can sleep.
63 */
64 if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) {
65 u64 mactime;
66 int ret;
67 struct wl12xx_command cmd;
68 struct acx_tsf_info *tsf_info;
69
70 memset(&cmd, 0, sizeof(cmd));
71
72 ret = wl12xx_cmd_interrogate(wl, ACX_TSF_INFO,
73 sizeof(struct acx_tsf_info),
74 &cmd);
75 if (ret < 0) {
76 wl12xx_warning("ACX_FW_REV interrogate failed");
77 return;
78 }
79
80 tsf_info = (struct acx_tsf_info *)&(cmd.parameters);
81
82 mactime = tsf_info->current_tsf_lsb |
83 (tsf_info->current_tsf_msb << 31);
84
85 status->mactime = mactime;
86 }
87
88 status->signal = desc->rssi;
89 status->qual = (desc->rssi - WL12XX_RX_MIN_RSSI) * 100 /
90 (WL12XX_RX_MAX_RSSI - WL12XX_RX_MIN_RSSI);
91 status->qual = min(status->qual, 100);
92 status->qual = max(status->qual, 0);
93
94 /*
95 * FIXME: guessing that snr needs to be divided by two, otherwise
96 * the values don't make any sense
97 */
98 status->noise = desc->rssi - desc->snr / 2;
99
100 status->freq = ieee80211_channel_to_frequency(desc->channel);
101
102 status->flag |= RX_FLAG_TSFT;
103
104 if (desc->flags & RX_DESC_ENCRYPTION_MASK) {
105 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
106
107 if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL)))
108 status->flag |= RX_FLAG_DECRYPTED;
109
110 if (unlikely(desc->flags & RX_DESC_MIC_FAIL))
111 status->flag |= RX_FLAG_MMIC_ERROR;
112 }
113
114 if (unlikely(!(desc->flags & RX_DESC_VALID_FCS)))
115 status->flag |= RX_FLAG_FAILED_FCS_CRC;
116
117
118 /* FIXME: set status->rate_idx */
119}
120
121static void wl12xx_rx_body(struct wl12xx *wl,
122 struct wl12xx_rx_descriptor *desc)
123{
124 struct sk_buff *skb;
125 struct ieee80211_rx_status status;
126 u8 *rx_buffer, beacon = 0;
127 u16 length, *fc;
128 u32 curr_id, last_id_inc, rx_packet_ring_addr;
129
130 length = WL12XX_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH);
131 curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT;
132 last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1);
133
134 if (last_id_inc != curr_id) {
135 wl12xx_warning("curr ID:%d, last ID inc:%d",
136 curr_id, last_id_inc);
137 wl->rx_last_id = curr_id;
138 } else {
139 wl->rx_last_id = last_id_inc;
140 }
141
142 rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr +
143 sizeof(struct wl12xx_rx_descriptor) + 20;
144 if (wl->rx_current_buffer)
145 rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
146
147 skb = dev_alloc_skb(length);
148 if (!skb) {
149 wl12xx_error("Couldn't allocate RX frame");
150 return;
151 }
152
153 rx_buffer = skb_put(skb, length);
154 wl12xx_spi_mem_read(wl, rx_packet_ring_addr, rx_buffer, length);
155
156 /* The actual lenght doesn't include the target's alignment */
157 skb->len = desc->length - PLCP_HEADER_LENGTH;
158
159 fc = (u16 *)skb->data;
160
161 if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
162 beacon = 1;
163
164 wl12xx_rx_status(wl, desc, &status, beacon);
165
166 wl12xx_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
167 beacon ? "beacon" : "");
168
169 ieee80211_rx(wl->hw, skb, &status);
170}
171
172static void wl12xx_rx_ack(struct wl12xx *wl)
173{
174 u32 data, addr;
175
176 if (wl->rx_current_buffer) {
177 addr = ACX_REG_INTERRUPT_TRIG_H;
178 data = INTR_TRIG_RX_PROC1;
179 } else {
180 addr = ACX_REG_INTERRUPT_TRIG;
181 data = INTR_TRIG_RX_PROC0;
182 }
183
184 wl12xx_reg_write32(wl, addr, data);
185
186 /* Toggle buffer ring */
187 wl->rx_current_buffer = !wl->rx_current_buffer;
188}
189
190
191void wl12xx_rx(struct wl12xx *wl)
192{
193 struct wl12xx_rx_descriptor rx_desc;
194
195 if (wl->state != WL12XX_STATE_ON)
196 return;
197
198 /* We first read the frame's header */
199 wl12xx_rx_header(wl, &rx_desc);
200
201 /* Now we can read the body */
202 wl12xx_rx_body(wl, &rx_desc);
203
204 /* Finally, we need to ACK the RX */
205 wl12xx_rx_ack(wl);
206
207 return;
208}