1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/rx.c b/drivers/net/wireless/wl12xx/rx.c
new file mode 100644
index 000000000000..70091035e019
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/rx.c
@@ -0,0 +1,244 @@
+/*
+ * 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_common_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_common_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)
+{
+        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 = wl1271_rate_to_idx(desc->rate, status->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,
+                                                      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)
+{
+        struct wl1271_rx_descriptor *desc;
+        struct sk_buff *skb;
+        struct ieee80211_hdr *hdr;
+        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;
+
+        /* the data read starts with the descriptor */
+        desc = (struct wl1271_rx_descriptor *) data;
+
+        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 = __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);
+
+        /* now we pull the descriptor out of the buffer */
+        skb_pull(skb, sizeof(*desc));
+
+        hdr = (struct ieee80211_hdr *)skb->data;
+        if (ieee80211_is_beacon(hdr->frame_control))
+                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 - desc->pad_len,
+                     beacon ? "beacon" : "");
+
+        skb_trim(skb, skb->len - desc->pad_len);
+
+        skb_queue_tail(&wl->deferred_rx_queue, skb);
+        ieee80211_queue_work(wl->hw, &wl->netstack_work);
+
+        return 0;
+}
+
+void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_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;
+                }
+
+                if (wl->chip.id != CHIP_ID_1283_PG20) {
+                        /*
+                         * 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;
+                }
+        }
+
+        /*
+         * Write the driver's packet counter to the FW. This is only required
+         * for older hardware revisions
+         */
+        if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
+                wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
+}
+
+void wl1271_set_default_filters(struct wl1271 *wl)
+{
+        if (wl->bss_type == BSS_TYPE_AP_BSS) {
+                wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG;
+                wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER;
+        } else {
+                wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG;
+                wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER;
+        }
+}