/* * This file is part of wl1271 * * Copyright (C) 2009 Nokia Corporation * * Contact: Luciano Coelho * * 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 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; } /* 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 */ }; /* The values of this table must match the wl1271_rates[] array */ static u8 wl1271_5_ghz_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 */ 7, /* WL1271_RATE_54 */ 6, /* WL1271_RATE_48 */ 5, /* WL1271_RATE_36 */ 4, /* WL1271_RATE_24 */ /* TI-specific rate */ WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */ 3, /* WL1271_RATE_18 */ 2, /* WL1271_RATE_12 */ WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11 */ 1, /* WL1271_RATE_9 */ 0, /* WL1271_RATE_6 */ WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5 */ WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2 */ WL1271_RX_RATE_UNSUPPORTED /* 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; status->rate_idx = wl1271_rx_rate_to_idx[desc->rate]; } else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_A) { status->band = IEEE80211_BAND_5GHZ; status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate]; } else wl1271_warning("unsupported band 0x%x", desc->flags & WL1271_RX_DESC_BAND_MASK); if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED)) wl1271_warning("unsupported rate"); /* * 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: 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->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 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, GFP_KERNEL); if (!skb) { wl1271_error("Couldn't allocate RX frame"); return; } buf = skb_put(skb, length); wl1271_spi_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_ni(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) + le32_to_cpu(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_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_spi_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter); }