diff options
Diffstat (limited to 'drivers/net/wireless/ti/wlcore/rx.c')
| -rw-r--r-- | drivers/net/wireless/ti/wlcore/rx.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wlcore/rx.c b/drivers/net/wireless/ti/wlcore/rx.c new file mode 100644 index 000000000000..89bd9385e90b --- /dev/null +++ b/drivers/net/wireless/ti/wlcore/rx.c @@ -0,0 +1,280 @@ +/* + * 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 <linux/sched.h> + +#include "wlcore.h" +#include "debug.h" +#include "acx.h" +#include "rx.h" +#include "tx.h" +#include "io.h" +#include "hw_ops.h" + +/* + * TODO: this is here just for now, it must be removed when the data + * operations are in place. + */ +#include "../wl12xx/reg.h" + +static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, + u32 rx_pkt_desc) +{ + if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) + return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> + ALIGNED_RX_BUF_SIZE_SHIFT; + + return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; +} + +static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) +{ + if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) + return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); + + return pkt_len; +} + +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 + status->band = IEEE80211_BAND_5GHZ; + + status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); + + /* 11n support */ + if (desc->rate <= wl->hw_min_ht_rate) + status->flag |= RX_FLAG_HT; + + 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, + status->band); + + if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { + u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; + + status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | + RX_FLAG_DECRYPTED; + + if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { + status->flag |= RX_FLAG_MMIC_ERROR; + wl1271_warning("Michael MIC error"); + } + } +} + +static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, + enum wl_rx_buf_align rx_align, u8 *hlid) +{ + struct wl1271_rx_descriptor *desc; + struct sk_buff *skb; + struct ieee80211_hdr *hdr; + u8 *buf; + u8 beacon = 0; + u8 is_data = 0; + u8 reserved = 0; + u16 seq_num; + u32 pkt_data_len; + + /* + * In PLT mode we seem to get frames and mac80211 warns about them, + * workaround this by not retrieving them at all. + */ + if (unlikely(wl->plt)) + return -EINVAL; + + pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); + if (!pkt_data_len) { + wl1271_error("Invalid packet arrived from HW. length %d", + length); + return -EINVAL; + } + + if (rx_align == WLCORE_RX_BUF_UNALIGNED) + reserved = NET_IP_ALIGN; + + /* the data read starts with the descriptor */ + desc = (struct wl1271_rx_descriptor *) data; + + if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { + size_t len = length - sizeof(*desc); + wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); + wake_up_interruptible(&wl->fwlog_waitq); + return 0; + } + + switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { + /* discard corrupted packets */ + case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: + case WL1271_RX_DESC_DECRYPT_FAIL: + wl1271_warning("corrupted packet in RX with status: 0x%x", + desc->status & WL1271_RX_DESC_STATUS_MASK); + return -EINVAL; + case WL1271_RX_DESC_SUCCESS: + case WL1271_RX_DESC_MIC_FAIL: + break; + default: + wl1271_error("invalid RX descriptor status: 0x%x", + desc->status & WL1271_RX_DESC_STATUS_MASK); + return -EINVAL; + } + + /* skb length not including rx descriptor */ + skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); + if (!skb) { + wl1271_error("Couldn't allocate RX frame"); + return -ENOMEM; + } + + /* reserve the unaligned payload(if any) */ + skb_reserve(skb, reserved); + + buf = skb_put(skb, pkt_data_len); + + /* + * Copy packets from aggregation buffer to the skbs without rx + * descriptor and with packet payload aligned care. In case of unaligned + * packets copy the packets in offset of 2 bytes guarantee IP header + * payload aligned to 4 bytes. + */ + memcpy(buf, data + sizeof(*desc), pkt_data_len); + if (rx_align == WLCORE_RX_BUF_PADDED) + skb_pull(skb, NET_IP_ALIGN); + + *hlid = desc->hlid; + + hdr = (struct ieee80211_hdr *)skb->data; + if (ieee80211_is_beacon(hdr->frame_control)) + beacon = 1; + if (ieee80211_is_data_present(hdr->frame_control)) + is_data = 1; + + wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); + + seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; + wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, + skb->len - desc->pad_len, + beacon ? "beacon" : "", + seq_num, *hlid); + + skb_queue_tail(&wl->deferred_rx_queue, skb); + queue_work(wl->freezable_wq, &wl->netstack_work); + + return is_data; +} + +void wl12xx_rx(struct wl1271 *wl, struct wl_fw_status *status) +{ + unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; + 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 pkt_len, align_pkt_len; + u32 pkt_offset, des; + u8 hlid; + enum wl_rx_buf_align rx_align; + + while (drv_rx_counter != fw_rx_counter) { + buf_size = 0; + rx_counter = drv_rx_counter; + while (rx_counter != fw_rx_counter) { + des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); + pkt_len = wlcore_rx_get_buf_size(wl, des); + align_pkt_len = wlcore_rx_get_align_buf_size(wl, + pkt_len); + if (buf_size + align_pkt_len > WL1271_AGGR_BUFFER_SIZE) + break; + buf_size += align_pkt_len; + rx_counter++; + rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; + } + + if (buf_size == 0) { + wl1271_warning("received empty data"); + break; + } + + /* Read all available packets at once */ + des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); + wlcore_hw_prepare_read(wl, des, buf_size); + wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, + buf_size, true); + + /* Split data into separate packets */ + pkt_offset = 0; + while (pkt_offset < buf_size) { + des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); + pkt_len = wlcore_rx_get_buf_size(wl, des); + rx_align = wlcore_hw_get_rx_buf_align(wl, des); + + /* + * the handle data call can only fail in memory-outage + * conditions, in that case the received frame will just + * be dropped. + */ + if (wl1271_rx_handle_data(wl, + wl->aggr_buf + pkt_offset, + pkt_len, rx_align, + &hlid) == 1) { + if (hlid < WL12XX_MAX_LINKS) + __set_bit(hlid, active_hlids); + else + WARN(1, + "hlid exceeded WL12XX_MAX_LINKS " + "(%d)\n", hlid); + } + + wl->rx_counter++; + drv_rx_counter++; + drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; + pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); + } + } + + /* + * Write the driver's packet counter to the FW. This is only required + * for older hardware revisions + */ + if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) + wl1271_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, + wl->rx_counter); + + wl12xx_rearm_rx_streaming(wl, active_hlids); +} |