1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_rx.c b/drivers/net/wireless/wl12xx/wl1271_rx.c
new file mode 100644
index 000000000000..ad8b6904c5eb
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_rx.c
@@ -0,0 +1,200 @@
+/*
+ * 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 "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 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 (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    */
+};
+
+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
+                wl1271_warning("unsupported band 0x%x",
+                               desc->flags & WL1271_RX_DESC_BAND_MASK);
+
+        /*
+         * 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: Should this be optimized? */
+        status->qual = (desc->rssi - WL1271_RX_MIN_RSSI) * 100 /
+                (WL1271_RX_MAX_RSSI - WL1271_RX_MIN_RSSI);
+        status->qual = min(status->qual, 100);
+        status->qual = max(status->qual, 0);
+
+        /*
+         * 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->flags & WL1271_RX_DESC_DECRYPT_FAIL)))
+                        status->flag |= RX_FLAG_DECRYPTED;
+
+                if (unlikely(desc->flags & WL1271_RX_DESC_MIC_FAIL))
+                        status->flag |= RX_FLAG_MMIC_ERROR;
+        }
+
+        status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
+
+        if (status->rate_idx == WL1271_RX_RATE_UNSUPPORTED)
+                wl1271_warning("unsupported rate");
+}
+
+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);
+        if (!skb) {
+                wl1271_error("Couldn't allocate RX frame");
+                return;
+        }
+
+        buf = skb_put(skb, length);
+        wl1271_spi_reg_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(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) + 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_reg_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_reg_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
+
+        /* This is a workaround for some problems in the chip */
+        wl1271_reg_write32(wl, RX_DRIVER_DUMMY_WRITE_ADDRESS, 0x1);
+
+}