drivers/net/wireless/wl12xx/wl1271_rx.c - kernel/msm - Gitiles

 /*
  * 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 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;
 }

 /* 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    */
 };

 /* The values of this table must match the wl1271_rates[] array */
 static u8 wl1271_5_ghz_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 */

 	7,                          /* WL1271_RATE_54   */
 	6,                          /* WL1271_RATE_48   */
 	5,                          /* WL1271_RATE_36   */
 	4,                          /* WL1271_RATE_24   */

 	/* TI-specific rate */
 	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22   */

 	3,                          /* WL1271_RATE_18   */
 	2,                          /* WL1271_RATE_12   */
 	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11   */
 	1,                          /* WL1271_RATE_9    */
 	0,                          /* WL1271_RATE_6    */
 	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5  */
 	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2    */
 	WL1271_RX_RATE_UNSUPPORTED  /* 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;
 		status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
 	} else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
 		 WL1271_RX_DESC_BAND_A) {
 		status->band = IEEE80211_BAND_5GHZ;
 		status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
 	} else
 		wl1271_warning("unsupported band 0x%x",
 			       desc->flags & WL1271_RX_DESC_BAND_MASK);

 	if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
 		wl1271_warning("unsupported rate");

 	/*
 	 * 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: 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->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 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_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_ni(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) +
 			le32_to_cpu(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_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_spi_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
 }
	/*
	* 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 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;
	}

	/* 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 */
	};

	/* The values of this table must match the wl1271_rates[] array */
	static u8 wl1271_5_ghz_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 */

	7, /* WL1271_RATE_54 */
	6, /* WL1271_RATE_48 */
	5, /* WL1271_RATE_36 */
	4, /* WL1271_RATE_24 */

	/* TI-specific rate */
	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */

	3, /* WL1271_RATE_18 */
	2, /* WL1271_RATE_12 */
	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11 */
	1, /* WL1271_RATE_9 */
	0, /* WL1271_RATE_6 */
	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5 */
	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2 */
	WL1271_RX_RATE_UNSUPPORTED /* 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;
	status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
	} else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
	WL1271_RX_DESC_BAND_A) {
	status->band = IEEE80211_BAND_5GHZ;
	status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
	} else
	wl1271_warning("unsupported band 0x%x",
	desc->flags & WL1271_RX_DESC_BAND_MASK);

	if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
	wl1271_warning("unsupported rate");

	/*
	* 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: 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->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 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_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_ni(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) +
	le32_to_cpu(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_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_spi_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
	}