diff options
Diffstat (limited to 'drivers/net/wireless/ti/wl1251/rx.c')
| -rw-r--r-- | drivers/net/wireless/ti/wl1251/rx.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wl1251/rx.c b/drivers/net/wireless/ti/wl1251/rx.c new file mode 100644 index 000000000000..6af35265c900 --- /dev/null +++ b/drivers/net/wireless/ti/wl1251/rx.c @@ -0,0 +1,235 @@ +/* + * This file is part of wl1251 + * + * Copyright (c) 1998-2007 Texas Instruments Incorporated + * Copyright (C) 2008 Nokia Corporation + * + * 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/skbuff.h> +#include <linux/gfp.h> +#include <net/mac80211.h> + +#include "wl1251.h" +#include "reg.h" +#include "io.h" +#include "rx.h" +#include "cmd.h" +#include "acx.h" + +static void wl1251_rx_header(struct wl1251 *wl, + struct wl1251_rx_descriptor *desc) +{ + u32 rx_packet_ring_addr; + + rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr; + if (wl->rx_current_buffer) + rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; + + wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc)); +} + +static void wl1251_rx_status(struct wl1251 *wl, + struct wl1251_rx_descriptor *desc, + struct ieee80211_rx_status *status, + u8 beacon) +{ + u64 mactime; + int ret; + + memset(status, 0, sizeof(struct ieee80211_rx_status)); + + status->band = IEEE80211_BAND_2GHZ; + status->mactime = desc->timestamp; + + /* + * The rx status timestamp is a 32 bits value while the TSF is a + * 64 bits one. + * For IBSS merging, TSF is mandatory, so we have to get it + * somehow, so we ask for ACX_TSF_INFO. + * That could be moved to the get_tsf() hook, but unfortunately, + * this one must be atomic, while our SPI routines can sleep. + */ + if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) { + ret = wl1251_acx_tsf_info(wl, &mactime); + if (ret == 0) + status->mactime = mactime; + } + + status->signal = desc->rssi; + + /* + * FIXME: guessing that snr needs to be divided by two, otherwise + * the values don't make any sense + */ + wl->noise = desc->rssi - desc->snr / 2; + + status->freq = ieee80211_channel_to_frequency(desc->channel, + status->band); + + status->flag |= RX_FLAG_MACTIME_MPDU; + + if (desc->flags & RX_DESC_ENCRYPTION_MASK) { + status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED; + + if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL))) + status->flag |= RX_FLAG_DECRYPTED; + + if (unlikely(desc->flags & RX_DESC_MIC_FAIL)) + status->flag |= RX_FLAG_MMIC_ERROR; + } + + if (unlikely(!(desc->flags & RX_DESC_VALID_FCS))) + status->flag |= RX_FLAG_FAILED_FCS_CRC; + + switch (desc->rate) { + /* skip 1 and 12 Mbps because they have same value 0x0a */ + case RATE_2MBPS: + status->rate_idx = 1; + break; + case RATE_5_5MBPS: + status->rate_idx = 2; + break; + case RATE_11MBPS: + status->rate_idx = 3; + break; + case RATE_6MBPS: + status->rate_idx = 4; + break; + case RATE_9MBPS: + status->rate_idx = 5; + break; + case RATE_18MBPS: + status->rate_idx = 7; + break; + case RATE_24MBPS: + status->rate_idx = 8; + break; + case RATE_36MBPS: + status->rate_idx = 9; + break; + case RATE_48MBPS: + status->rate_idx = 10; + break; + case RATE_54MBPS: + status->rate_idx = 11; + break; + } + + /* for 1 and 12 Mbps we have to check the modulation */ + if (desc->rate == RATE_1MBPS) { + if (!(desc->mod_pre & OFDM_RATE_BIT)) + /* CCK -> RATE_1MBPS */ + status->rate_idx = 0; + else + /* OFDM -> RATE_12MBPS */ + status->rate_idx = 6; + } + + if (desc->mod_pre & SHORT_PREAMBLE_BIT) + status->flag |= RX_FLAG_SHORTPRE; +} + +static void wl1251_rx_body(struct wl1251 *wl, + struct wl1251_rx_descriptor *desc) +{ + struct sk_buff *skb; + struct ieee80211_rx_status status; + u8 *rx_buffer, beacon = 0; + u16 length, *fc; + u32 curr_id, last_id_inc, rx_packet_ring_addr; + + length = WL1251_RX_ALIGN(desc->length - PLCP_HEADER_LENGTH); + curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT; + last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1); + + if (last_id_inc != curr_id) { + wl1251_warning("curr ID:%d, last ID inc:%d", + curr_id, last_id_inc); + wl->rx_last_id = curr_id; + } else { + wl->rx_last_id = last_id_inc; + } + + rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr + + sizeof(struct wl1251_rx_descriptor) + 20; + if (wl->rx_current_buffer) + rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size; + + skb = __dev_alloc_skb(length, GFP_KERNEL); + if (!skb) { + wl1251_error("Couldn't allocate RX frame"); + return; + } + + rx_buffer = skb_put(skb, length); + wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length); + + /* The actual length doesn't include the target's alignment */ + skb->len = desc->length - PLCP_HEADER_LENGTH; + + fc = (u16 *)skb->data; + + if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) + beacon = 1; + + wl1251_rx_status(wl, desc, &status, beacon); + + wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len, + beacon ? "beacon" : ""); + + memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); + ieee80211_rx_ni(wl->hw, skb); +} + +static void wl1251_rx_ack(struct wl1251 *wl) +{ + u32 data, addr; + + if (wl->rx_current_buffer) { + addr = ACX_REG_INTERRUPT_TRIG_H; + data = INTR_TRIG_RX_PROC1; + } else { + addr = ACX_REG_INTERRUPT_TRIG; + data = INTR_TRIG_RX_PROC0; + } + + wl1251_reg_write32(wl, addr, data); + + /* Toggle buffer ring */ + wl->rx_current_buffer = !wl->rx_current_buffer; +} + + +void wl1251_rx(struct wl1251 *wl) +{ + struct wl1251_rx_descriptor *rx_desc; + + if (wl->state != WL1251_STATE_ON) + return; + + rx_desc = wl->rx_descriptor; + + /* We first read the frame's header */ + wl1251_rx_header(wl, rx_desc); + + /* Now we can read the body */ + wl1251_rx_body(wl, rx_desc); + + /* Finally, we need to ACK the RX */ + wl1251_rx_ack(wl); +} |