diff options
Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_rx.c')
| -rw-r--r-- | drivers/net/wireless/wl12xx/wl1271_rx.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/wl1271_rx.c b/drivers/net/wireless/wl12xx/wl1271_rx.c new file mode 100644 index 00000000000..ad8b6904c5e --- /dev/null +++ b/drivers/net/wireless/wl12xx/wl1271_rx.c @@ -0,0 +1,200 @@ +/* + * 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); + +} |