forked from Minki/linux
ece550d0e4
Signed-off-by: John W. Linville <linville@tuxdriver.com> Acked-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/gfp.h>
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#include "wl1271.h"
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#include "wl1271_acx.h"
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#include "wl1271_reg.h"
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#include "wl1271_rx.h"
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#include "wl1271_io.h"
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static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
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u32 drv_rx_counter)
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{
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return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
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RX_MEM_BLOCK_MASK;
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}
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static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
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u32 drv_rx_counter)
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{
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return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
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RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
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}
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static void wl1271_rx_status(struct wl1271 *wl,
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struct wl1271_rx_descriptor *desc,
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struct ieee80211_rx_status *status,
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u8 beacon)
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{
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memset(status, 0, sizeof(struct ieee80211_rx_status));
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status->band = wl->band;
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status->rate_idx = wl1271_rate_to_idx(wl, desc->rate);
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status->signal = desc->rssi;
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/*
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* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
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* need to divide by two for now, but TI has been discussing about
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* changing it. This needs to be rechecked.
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*/
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wl->noise = desc->rssi - (desc->snr >> 1);
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status->freq = ieee80211_channel_to_frequency(desc->channel);
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if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
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status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
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if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
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status->flag |= RX_FLAG_DECRYPTED;
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if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
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status->flag |= RX_FLAG_MMIC_ERROR;
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}
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}
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static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
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{
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struct ieee80211_rx_status rx_status;
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struct wl1271_rx_descriptor *desc;
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struct sk_buff *skb;
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u16 *fc;
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u8 *buf;
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u8 beacon = 0;
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/*
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* In PLT mode we seem to get frames and mac80211 warns about them,
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* workaround this by not retrieving them at all.
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*/
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if (unlikely(wl->state == WL1271_STATE_PLT))
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return;
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skb = __dev_alloc_skb(length, GFP_KERNEL);
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if (!skb) {
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wl1271_error("Couldn't allocate RX frame");
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return;
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}
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buf = skb_put(skb, length);
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wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
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/* the data read starts with the descriptor */
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desc = (struct wl1271_rx_descriptor *) buf;
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/* now we pull the descriptor out of the buffer */
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skb_pull(skb, sizeof(*desc));
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fc = (u16 *)skb->data;
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if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
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beacon = 1;
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wl1271_rx_status(wl, desc, &rx_status, beacon);
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wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
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beacon ? "beacon" : "");
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skb_trim(skb, skb->len - desc->pad_len);
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memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
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ieee80211_rx_ni(wl->hw, skb);
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}
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void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)
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{
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struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
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u32 buf_size;
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u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
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u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
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u32 mem_block;
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while (drv_rx_counter != fw_rx_counter) {
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mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
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buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
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if (buf_size == 0) {
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wl1271_warning("received empty data");
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break;
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}
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wl->rx_mem_pool_addr.addr = (mem_block << 8) +
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le32_to_cpu(wl_mem_map->packet_memory_pool_start);
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wl->rx_mem_pool_addr.addr_extra =
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wl->rx_mem_pool_addr.addr + 4;
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/* Choose the block we want to read */
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wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
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sizeof(wl->rx_mem_pool_addr), false);
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wl1271_rx_handle_data(wl, buf_size);
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wl->rx_counter++;
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drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
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}
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wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
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}
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