diff options
Diffstat (limited to 'drivers/net/wireless/wl12xx/rx.c')
| -rw-r--r-- | drivers/net/wireless/wl12xx/rx.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/rx.c b/drivers/net/wireless/wl12xx/rx.c new file mode 100644 index 00000000000..682304c30b8 --- /dev/null +++ b/drivers/net/wireless/wl12xx/rx.c @@ -0,0 +1,203 @@ +/* + * 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 <linux/gfp.h> + +#include "wl12xx.h" +#include "acx.h" +#include "reg.h" +#include "rx.h" +#include "io.h" + +static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status, + u32 drv_rx_counter) +{ + return le32_to_cpu(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 (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & + RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; +} + +static void wl1271_rx_status(struct wl1271 *wl, + struct wl1271_rx_descriptor *desc, + struct ieee80211_rx_status *status, + u8 beacon) +{ + enum ieee80211_band desc_band; + + memset(status, 0, sizeof(struct ieee80211_rx_status)); + + status->band = wl->band; + + if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) + desc_band = IEEE80211_BAND_2GHZ; + else + desc_band = IEEE80211_BAND_5GHZ; + + status->rate_idx = wl1271_rate_to_idx(desc->rate, desc_band); + +#ifdef CONFIG_WL12XX_HT + /* 11n support */ + if (desc->rate <= CONF_HW_RXTX_RATE_MCS0) + status->flag |= RX_FLAG_HT; +#endif + + status->signal = desc->rssi; + + /* + * 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. + */ + wl->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->status & WL1271_RX_DESC_DECRYPT_FAIL))) + status->flag |= RX_FLAG_DECRYPTED; + if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL)) + status->flag |= RX_FLAG_MMIC_ERROR; + } +} + +static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length) +{ + struct wl1271_rx_descriptor *desc; + struct sk_buff *skb; + u16 *fc; + u8 *buf; + u8 beacon = 0; + + /* + * In PLT mode we seem to get frames and mac80211 warns about them, + * workaround this by not retrieving them at all. + */ + if (unlikely(wl->state == WL1271_STATE_PLT)) + return -EINVAL; + + skb = __dev_alloc_skb(length, GFP_KERNEL); + if (!skb) { + wl1271_error("Couldn't allocate RX frame"); + return -ENOMEM; + } + + buf = skb_put(skb, length); + memcpy(buf, data, length); + + /* 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, IEEE80211_SKB_RXCB(skb), beacon); + + wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, + beacon ? "beacon" : ""); + + skb_trim(skb, skb->len - desc->pad_len); + + ieee80211_rx_ni(wl->hw, skb); + + return 0; +} + +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 rx_counter; + u32 mem_block; + u32 pkt_length; + u32 pkt_offset; + + while (drv_rx_counter != fw_rx_counter) { + buf_size = 0; + rx_counter = drv_rx_counter; + while (rx_counter != fw_rx_counter) { + pkt_length = wl1271_rx_get_buf_size(status, rx_counter); + if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE) + break; + buf_size += pkt_length; + rx_counter++; + rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; + } + + if (buf_size == 0) { + wl1271_warning("received empty data"); + break; + } + + /* + * Choose the block we want to read + * For aggregated packets, only the first memory block should + * be retrieved. The FW takes care of the rest. + */ + mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter); + wl->rx_mem_pool_addr.addr = (mem_block << 8) + + le32_to_cpu(wl_mem_map->packet_memory_pool_start); + wl->rx_mem_pool_addr.addr_extra = + wl->rx_mem_pool_addr.addr + 4; + wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr, + sizeof(wl->rx_mem_pool_addr), false); + + /* Read all available packets at once */ + wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, + buf_size, true); + + /* Split data into separate packets */ + pkt_offset = 0; + while (pkt_offset < buf_size) { + pkt_length = wl1271_rx_get_buf_size(status, + drv_rx_counter); + /* + * the handle data call can only fail in memory-outage + * conditions, in that case the received frame will just + * be dropped. + */ + wl1271_rx_handle_data(wl, + wl->aggr_buf + pkt_offset, + pkt_length); + wl->rx_counter++; + drv_rx_counter++; + drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; + pkt_offset += pkt_length; + } + } + wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, + cpu_to_le32(wl->rx_counter)); +} |