201 lines
6.2 KiB
C
201 lines
6.2 KiB
C
/*
|
|
* This file is part of wl1271
|
|
*
|
|
* Copyright (C) 2009 Nokia Corporation
|
|
*
|
|
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include "wl1271.h"
|
|
#include "wl1271_acx.h"
|
|
#include "wl1271_reg.h"
|
|
#include "wl1271_rx.h"
|
|
#include "wl1271_spi.h"
|
|
|
|
static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
|
|
u32 drv_rx_counter)
|
|
{
|
|
return status->rx_pkt_descs[drv_rx_counter] & RX_MEM_BLOCK_MASK;
|
|
}
|
|
|
|
static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
|
|
u32 drv_rx_counter)
|
|
{
|
|
return (status->rx_pkt_descs[drv_rx_counter] & RX_BUF_SIZE_MASK) >>
|
|
RX_BUF_SIZE_SHIFT_DIV;
|
|
}
|
|
|
|
/* The values of this table must match the wl1271_rates[] array */
|
|
static u8 wl1271_rx_rate_to_idx[] = {
|
|
/* MCS rates are used only with 11n */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
|
|
|
|
11, /* WL1271_RATE_54 */
|
|
10, /* WL1271_RATE_48 */
|
|
9, /* WL1271_RATE_36 */
|
|
8, /* WL1271_RATE_24 */
|
|
|
|
/* TI-specific rate */
|
|
WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */
|
|
|
|
7, /* WL1271_RATE_18 */
|
|
6, /* WL1271_RATE_12 */
|
|
3, /* WL1271_RATE_11 */
|
|
5, /* WL1271_RATE_9 */
|
|
4, /* WL1271_RATE_6 */
|
|
2, /* WL1271_RATE_5_5 */
|
|
1, /* WL1271_RATE_2 */
|
|
0 /* WL1271_RATE_1 */
|
|
};
|
|
|
|
static void wl1271_rx_status(struct wl1271 *wl,
|
|
struct wl1271_rx_descriptor *desc,
|
|
struct ieee80211_rx_status *status,
|
|
u8 beacon)
|
|
{
|
|
memset(status, 0, sizeof(struct ieee80211_rx_status));
|
|
|
|
if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
|
|
status->band = IEEE80211_BAND_2GHZ;
|
|
else
|
|
wl1271_warning("unsupported band 0x%x",
|
|
desc->flags & WL1271_RX_DESC_BAND_MASK);
|
|
|
|
/*
|
|
* FIXME: Add mactime handling. For IBSS (ad-hoc) we need to get the
|
|
* timestamp from the beacon (acx_tsf_info). In BSS mode (infra) we
|
|
* only need the mactime for monitor mode. For now the mactime is
|
|
* not valid, so RX_FLAG_TSFT should not be set
|
|
*/
|
|
status->signal = desc->rssi;
|
|
|
|
/* FIXME: Should this be optimized? */
|
|
status->qual = (desc->rssi - WL1271_RX_MIN_RSSI) * 100 /
|
|
(WL1271_RX_MAX_RSSI - WL1271_RX_MIN_RSSI);
|
|
status->qual = min(status->qual, 100);
|
|
status->qual = max(status->qual, 0);
|
|
|
|
/*
|
|
* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
|
|
* need to divide by two for now, but TI has been discussing about
|
|
* changing it. This needs to be rechecked.
|
|
*/
|
|
status->noise = desc->rssi - (desc->snr >> 1);
|
|
|
|
status->freq = ieee80211_channel_to_frequency(desc->channel);
|
|
|
|
if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
|
|
status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
|
|
|
|
if (likely(!(desc->flags & WL1271_RX_DESC_DECRYPT_FAIL)))
|
|
status->flag |= RX_FLAG_DECRYPTED;
|
|
|
|
if (unlikely(desc->flags & WL1271_RX_DESC_MIC_FAIL))
|
|
status->flag |= RX_FLAG_MMIC_ERROR;
|
|
}
|
|
|
|
status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
|
|
|
|
if (status->rate_idx == WL1271_RX_RATE_UNSUPPORTED)
|
|
wl1271_warning("unsupported rate");
|
|
}
|
|
|
|
static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
|
|
{
|
|
struct ieee80211_rx_status rx_status;
|
|
struct wl1271_rx_descriptor *desc;
|
|
struct sk_buff *skb;
|
|
u16 *fc;
|
|
u8 *buf;
|
|
u8 beacon = 0;
|
|
|
|
skb = dev_alloc_skb(length);
|
|
if (!skb) {
|
|
wl1271_error("Couldn't allocate RX frame");
|
|
return;
|
|
}
|
|
|
|
buf = skb_put(skb, length);
|
|
wl1271_spi_reg_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
|
|
|
|
/* the data read starts with the descriptor */
|
|
desc = (struct wl1271_rx_descriptor *) buf;
|
|
|
|
/* now we pull the descriptor out of the buffer */
|
|
skb_pull(skb, sizeof(*desc));
|
|
|
|
fc = (u16 *)skb->data;
|
|
if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
|
|
beacon = 1;
|
|
|
|
wl1271_rx_status(wl, desc, &rx_status, beacon);
|
|
|
|
wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
|
|
beacon ? "beacon" : "");
|
|
|
|
memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
|
|
ieee80211_rx(wl->hw, skb);
|
|
}
|
|
|
|
void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
|
|
{
|
|
struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
|
|
u32 buf_size;
|
|
u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
|
|
u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
|
|
u32 mem_block;
|
|
|
|
while (drv_rx_counter != fw_rx_counter) {
|
|
mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
|
|
buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
|
|
|
|
if (buf_size == 0) {
|
|
wl1271_warning("received empty data");
|
|
break;
|
|
}
|
|
|
|
wl->rx_mem_pool_addr.addr =
|
|
(mem_block << 8) + wl_mem_map->packet_memory_pool_start;
|
|
wl->rx_mem_pool_addr.addr_extra =
|
|
wl->rx_mem_pool_addr.addr + 4;
|
|
|
|
/* Choose the block we want to read */
|
|
wl1271_spi_reg_write(wl, WL1271_SLV_REG_DATA,
|
|
&wl->rx_mem_pool_addr,
|
|
sizeof(wl->rx_mem_pool_addr), false);
|
|
|
|
wl1271_rx_handle_data(wl, buf_size);
|
|
|
|
wl->rx_counter++;
|
|
drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
|
|
}
|
|
|
|
wl1271_reg_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
|
|
|
|
/* This is a workaround for some problems in the chip */
|
|
wl1271_reg_write32(wl, RX_DRIVER_DUMMY_WRITE_ADDRESS, 0x1);
|
|
|
|
}
|