Commit | Line | Data |
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2f01a1f5 | 1 | /* |
80301cdc | 2 | * This file is part of wl1251 |
2f01a1f5 KV |
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 | ||
13674118 | 28 | #include "wl1251.h" |
2f01a1f5 | 29 | #include "reg.h" |
ef2f8d45 KV |
30 | #include "wl1251_spi.h" |
31 | #include "wl1251_rx.h" | |
32 | #include "wl1251_acx.h" | |
2f01a1f5 | 33 | |
80301cdc KV |
34 | static void wl1251_rx_header(struct wl1251 *wl, |
35 | struct wl1251_rx_descriptor *desc) | |
2f01a1f5 KV |
36 | { |
37 | u32 rx_packet_ring_addr; | |
38 | ||
39 | rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; | |
40 | if (wl->rx_current_buffer) | |
41 | rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; | |
42 | ||
80301cdc | 43 | wl1251_spi_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); |
2f01a1f5 KV |
44 | } |
45 | ||
80301cdc KV |
46 | static void wl1251_rx_status(struct wl1251 *wl, |
47 | struct wl1251_rx_descriptor *desc, | |
2f01a1f5 KV |
48 | struct ieee80211_rx_status *status, |
49 | u8 beacon) | |
50 | { | |
ff25839b KV |
51 | u64 mactime; |
52 | int ret; | |
53 | ||
2f01a1f5 KV |
54 | memset(status, 0, sizeof(struct ieee80211_rx_status)); |
55 | ||
56 | status->band = IEEE80211_BAND_2GHZ; | |
57 | status->mactime = desc->timestamp; | |
58 | ||
59 | /* | |
60 | * The rx status timestamp is a 32 bits value while the TSF is a | |
61 | * 64 bits one. | |
62 | * For IBSS merging, TSF is mandatory, so we have to get it | |
63 | * somehow, so we ask for ACX_TSF_INFO. | |
64 | * That could be moved to the get_tsf() hook, but unfortunately, | |
65 | * this one must be atomic, while our SPI routines can sleep. | |
66 | */ | |
67 | if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { | |
80301cdc | 68 | ret = wl1251_acx_tsf_info(wl, &mactime); |
ff25839b KV |
69 | if (ret == 0) |
70 | status->mactime = mactime; | |
2f01a1f5 KV |
71 | } |
72 | ||
73 | status->signal = desc->rssi; | |
80301cdc KV |
74 | status->qual = (desc->rssi - WL1251_RX_MIN_RSSI) * 100 / |
75 | (WL1251_RX_MAX_RSSI - WL1251_RX_MIN_RSSI); | |
2f01a1f5 KV |
76 | status->qual = min(status->qual, 100); |
77 | status->qual = max(status->qual, 0); | |
78 | ||
79 | /* | |
80 | * FIXME: guessing that snr needs to be divided by two, otherwise | |
81 | * the values don't make any sense | |
82 | */ | |
83 | status->noise = desc->rssi - desc->snr / 2; | |
84 | ||
85 | status->freq = ieee80211_channel_to_frequency(desc->channel); | |
86 | ||
87 | status->flag |= RX_FLAG_TSFT; | |
88 | ||
89 | if (desc->flags & RX_DESC_ENCRYPTION_MASK) { | |
90 | status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; | |
91 | ||
92 | if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) | |
93 | status->flag |= RX_FLAG_DECRYPTED; | |
94 | ||
95 | if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) | |
96 | status->flag |= RX_FLAG_MMIC_ERROR; | |
97 | } | |
98 | ||
99 | if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) | |
100 | status->flag |= RX_FLAG_FAILED_FCS_CRC; | |
101 | ||
102 | ||
103 | /* FIXME: set status->rate_idx */ | |
104 | } | |
105 | ||
80301cdc KV |
106 | static void wl1251_rx_body(struct wl1251 *wl, |
107 | struct wl1251_rx_descriptor *desc) | |
2f01a1f5 KV |
108 | { |
109 | struct sk_buff *skb; | |
110 | struct ieee80211_rx_status status; | |
111 | u8 *rx_buffer, beacon = 0; | |
112 | u16 length, *fc; | |
113 | u32 curr_id, last_id_inc, rx_packet_ring_addr; | |
114 | ||
80301cdc | 115 | length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); |
2f01a1f5 KV |
116 | curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; |
117 | last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); | |
118 | ||
119 | if (last_id_inc != curr_id) { | |
80301cdc | 120 | wl1251_warning("curr ID:%d, last ID inc:%d", |
2f01a1f5 KV |
121 | curr_id, last_id_inc); |
122 | wl->rx_last_id = curr_id; | |
123 | } else { | |
124 | wl->rx_last_id = last_id_inc; | |
125 | } | |
126 | ||
127 | rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + | |
80301cdc | 128 | sizeof(struct wl1251_rx_descriptor) + 20; |
2f01a1f5 KV |
129 | if (wl->rx_current_buffer) |
130 | rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; | |
131 | ||
132 | skb = dev_alloc_skb(length); | |
133 | if (!skb) { | |
80301cdc | 134 | wl1251_error("Couldn't allocate RX frame"); |
2f01a1f5 KV |
135 | return; |
136 | } | |
137 | ||
138 | rx_buffer = skb_put(skb, length); | |
80301cdc | 139 | wl1251_spi_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); |
2f01a1f5 KV |
140 | |
141 | /* The actual lenght doesn't include the target's alignment */ | |
142 | skb->len = desc->length - PLCP_HEADER_LENGTH; | |
143 | ||
144 | fc = (u16 *)skb->data; | |
145 | ||
146 | if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) | |
147 | beacon = 1; | |
148 | ||
80301cdc | 149 | wl1251_rx_status(wl, desc, &status, beacon); |
2f01a1f5 | 150 | |
80301cdc | 151 | wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, |
2f01a1f5 KV |
152 | beacon ? "beacon" : ""); |
153 | ||
154 | ieee80211_rx(wl->hw, skb, &status); | |
155 | } | |
156 | ||
80301cdc | 157 | static void wl1251_rx_ack(struct wl1251 *wl) |
2f01a1f5 KV |
158 | { |
159 | u32 data, addr; | |
160 | ||
161 | if (wl->rx_current_buffer) { | |
162 | addr = ACX_REG_INTERRUPT_TRIG_H; | |
163 | data = INTR_TRIG_RX_PROC1; | |
164 | } else { | |
165 | addr = ACX_REG_INTERRUPT_TRIG; | |
166 | data = INTR_TRIG_RX_PROC0; | |
167 | } | |
168 | ||
80301cdc | 169 | wl1251_reg_write32(wl, addr, data); |
2f01a1f5 KV |
170 | |
171 | /* Toggle buffer ring */ | |
172 | wl->rx_current_buffer = !wl->rx_current_buffer; | |
173 | } | |
174 | ||
175 | ||
80301cdc | 176 | void wl1251_rx(struct wl1251 *wl) |
2f01a1f5 | 177 | { |
80301cdc | 178 | struct wl1251_rx_descriptor *rx_desc; |
2f01a1f5 | 179 | |
80301cdc | 180 | if (wl->state != WL1251_STATE_ON) |
2f01a1f5 KV |
181 | return; |
182 | ||
4721213f KV |
183 | rx_desc = wl->rx_descriptor; |
184 | ||
2f01a1f5 | 185 | /* We first read the frame's header */ |
80301cdc | 186 | wl1251_rx_header(wl, rx_desc); |
2f01a1f5 KV |
187 | |
188 | /* Now we can read the body */ | |
80301cdc | 189 | wl1251_rx_body(wl, rx_desc); |
2f01a1f5 KV |
190 | |
191 | /* Finally, we need to ACK the RX */ | |
80301cdc | 192 | wl1251_rx_ack(wl); |
2f01a1f5 KV |
193 | |
194 | return; | |
195 | } |