--- /dev/null
+/*
+ * 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));
+}
projects / mv-sheeva.git / blobdiff