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path: root/drivers/net/wireless/wl12xx/wl1271_rx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_rx.c')
-rw-r--r--drivers/net/wireless/wl12xx/wl1271_rx.c200
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);
+
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-18 00:24:12 +0000