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>
27 #include "wl1271_acx.h"
28 #include "wl1271_reg.h"
29 #include "wl1271_rx.h"
30 #include "wl1271_io.h"
32 static u8
wl1271_rx_get_mem_block(struct wl1271_fw_status
*status
,
35 return le32_to_cpu(status
->rx_pkt_descs
[drv_rx_counter
]) &
39 static u32
wl1271_rx_get_buf_size(struct wl1271_fw_status
*status
,
42 return (le32_to_cpu(status
->rx_pkt_descs
[drv_rx_counter
]) &
43 RX_BUF_SIZE_MASK
) >> RX_BUF_SIZE_SHIFT_DIV
;
46 static void wl1271_rx_status(struct wl1271
*wl
,
47 struct wl1271_rx_descriptor
*desc
,
48 struct ieee80211_rx_status
*status
,
51 memset(status
, 0, sizeof(struct ieee80211_rx_status
));
53 status
->band
= wl
->band
;
54 status
->rate_idx
= wl1271_rate_to_idx(wl
, desc
->rate
);
56 status
->signal
= desc
->rssi
;
58 wl
->noise
= desc
->rssi
- (desc
->snr
>> 1);
60 status
->freq
= ieee80211_channel_to_frequency(desc
->channel
);
62 if (desc
->flags
& WL1271_RX_DESC_ENCRYPT_MASK
) {
63 status
->flag
|= RX_FLAG_IV_STRIPPED
| RX_FLAG_MMIC_STRIPPED
;
65 if (likely(!(desc
->status
& WL1271_RX_DESC_DECRYPT_FAIL
)))
66 status
->flag
|= RX_FLAG_DECRYPTED
;
67 if (unlikely(desc
->status
& WL1271_RX_DESC_MIC_FAIL
))
68 status
->flag
|= RX_FLAG_MMIC_ERROR
;
72 static void wl1271_rx_handle_data(struct wl1271
*wl
, u32 length
)
74 struct ieee80211_rx_status rx_status
;
75 struct wl1271_rx_descriptor
*desc
;
81 if (unlikely(wl
->state
== WL1271_STATE_PLT
))
84 skb
= __dev_alloc_skb(length
, GFP_KERNEL
);
86 wl1271_error("Couldn't allocate RX frame");
90 buf
= skb_put(skb
, length
);
91 wl1271_read(wl
, WL1271_SLV_MEM_DATA
, buf
, length
, true);
93 /* the data read starts with the descriptor */
94 desc
= (struct wl1271_rx_descriptor
*) buf
;
96 /* now we pull the descriptor out of the buffer */
97 skb_pull(skb
, sizeof(*desc
));
99 fc
= (u16
*)skb
->data
;
100 if ((*fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_BEACON
)
103 wl1271_rx_status(wl
, desc
, &rx_status
, beacon
);
105 wl1271_debug(DEBUG_RX
, "rx skb 0x%p: %d B %s", skb
, skb
->len
,
106 beacon
? "beacon" : "");
108 skb_trim(skb
, skb
->len
- desc
->pad_len
);
110 memcpy(IEEE80211_SKB_RXCB(skb
), &rx_status
, sizeof(rx_status
));
111 ieee80211_rx_ni(wl
->hw
, skb
);
114 void wl1271_rx(struct wl1271
*wl
, struct wl1271_fw_status
*status
)
116 struct wl1271_acx_mem_map
*wl_mem_map
= wl
->target_mem_map
;
118 u32 fw_rx_counter
= status
->fw_rx_counter
& NUM_RX_PKT_DESC_MOD_MASK
;
119 u32 drv_rx_counter
= wl
->rx_counter
& NUM_RX_PKT_DESC_MOD_MASK
;
122 while (drv_rx_counter
!= fw_rx_counter
) {
123 mem_block
= wl1271_rx_get_mem_block(status
, drv_rx_counter
);
124 buf_size
= wl1271_rx_get_buf_size(status
, drv_rx_counter
);
127 wl1271_warning("received empty data");
131 wl
->rx_mem_pool_addr
.addr
= (mem_block
<< 8) +
132 le32_to_cpu(wl_mem_map
->packet_memory_pool_start
);
133 wl
->rx_mem_pool_addr
.addr_extra
=
134 wl
->rx_mem_pool_addr
.addr
+ 4;
136 /* Choose the block we want to read */
137 wl1271_write(wl
, WL1271_SLV_REG_DATA
, &wl
->rx_mem_pool_addr
,
138 sizeof(wl
->rx_mem_pool_addr
), false);
140 wl1271_rx_handle_data(wl
, buf_size
);
143 drv_rx_counter
= wl
->rx_counter
& NUM_RX_PKT_DESC_MOD_MASK
;
146 wl1271_write32(wl
, RX_DRIVER_COUNTER_ADDRESS
, wl
->rx_counter
);