[net-next-2.6.git] / drivers / net / wireless / wl12xx / wl1271_rx.c

/*
 * 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 "wl1271.h"
#include "wl1271_acx.h"
#include "wl1271_reg.h"
#include "wl1271_rx.h"
#include "wl1271_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)
{
	memset(status, 0, sizeof(struct ieee80211_rx_status));

	status->band = wl->band;
	status->rate_idx = wl1271_rate_to_idx(wl, desc->rate);

	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 void wl1271_rx_handle_data(struct wl1271 *wl, 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;

	skb = __dev_alloc_skb(length, GFP_KERNEL);
	if (!skb) {
		wl1271_error("Couldn't allocate RX frame");
		return;
	}

	buf = skb_put(skb, length);
	wl1271_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, 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);
}

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_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_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
}
Commit	Line	Data
f5fc0f86 LC	1	/*
	2	* This file is part of wl1271
	3	*
	4	* Copyright (C) 2009 Nokia Corporation
	5	*
	6	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
5a0e3ad6 TH	24	#include <linux/gfp.h>
5a0e3ad6 TH	25
f5fc0f86 LC	26	#include "wl1271.h"
	27	#include "wl1271_acx.h"
	28	#include "wl1271_reg.h"
	29	#include "wl1271_rx.h"
7b048c52	30	#include "wl1271_io.h"
f5fc0f86 LC	31
	32	static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
	33	u32 drv_rx_counter)
	34	{
d0f63b20 LC	35	return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
d0f63b20 LC	36	RX_MEM_BLOCK_MASK;
f5fc0f86 LC	37	}
	38
	39	static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
	40	u32 drv_rx_counter)
	41	{
d0f63b20 LC	42	return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
d0f63b20 LC	43	RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
f5fc0f86 LC	44	}
f5fc0f86 LC	45
f5fc0f86 LC	46	static void wl1271_rx_status(struct wl1271 *wl,
	47	struct wl1271_rx_descriptor *desc,
	48	struct ieee80211_rx_status *status,
	49	u8 beacon)
	50	{
	51	memset(status, 0, sizeof(struct ieee80211_rx_status));
	52
f876bb9a JO	53	status->band = wl->band;
f876bb9a JO	54	status->rate_idx = wl1271_rate_to_idx(wl, desc->rate);
a4102645	55
f5fc0f86 LC	56	status->signal = desc->rssi;
f5fc0f86 LC	57
ece550d0 JL	58	/*
	59	* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
	60	* need to divide by two for now, but TI has been discussing about
	61	* changing it. This needs to be rechecked.
	62	*/
	63	wl->noise = desc->rssi - (desc->snr >> 1);
	64
f5fc0f86 LC	65	status->freq = ieee80211_channel_to_frequency(desc->channel);
	66
	67	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
	68	status->flag \|= RX_FLAG_IV_STRIPPED \| RX_FLAG_MMIC_STRIPPED;
	69
5d07b668	70	if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
f5fc0f86	71	status->flag \|= RX_FLAG_DECRYPTED;
5d07b668 TP	72	if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
5d07b668 TP	73	status->flag \|= RX_FLAG_MMIC_ERROR;
f5fc0f86	74	}
f5fc0f86 LC	75	}
	76
	77	static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
	78	{
f5fc0f86 LC	79	struct wl1271_rx_descriptor *desc;
	80	struct sk_buff *skb;
	81	u16 *fc;
	82	u8 *buf;
	83	u8 beacon = 0;
	84
93c5bb68 KV	85	/*
	86	* In PLT mode we seem to get frames and mac80211 warns about them,
	87	* workaround this by not retrieving them at all.
	88	*/
	89	if (unlikely(wl->state == WL1271_STATE_PLT))
	90	return;
	91
e9a6269d	92	skb = __dev_alloc_skb(length, GFP_KERNEL);
f5fc0f86 LC	93	if (!skb) {
	94	wl1271_error("Couldn't allocate RX frame");
	95	return;
	96	}
	97
	98	buf = skb_put(skb, length);
7b048c52	99	wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
f5fc0f86 LC	100
	101	/* the data read starts with the descriptor */
	102	desc = (struct wl1271_rx_descriptor *) buf;
	103
	104	/* now we pull the descriptor out of the buffer */
	105	skb_pull(skb, sizeof(*desc));
	106
	107	fc = (u16 *)skb->data;
	108	if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
	109	beacon = 1;
	110
58be4607	111	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
f5fc0f86 LC	112
	113	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
	114	beacon ? "beacon" : "");
	115
b9f2e39d JO	116	skb_trim(skb, skb->len - desc->pad_len);
b9f2e39d JO	117
287d3741	118	ieee80211_rx_ni(wl->hw, skb);
f5fc0f86 LC	119	}
	120
	121	void wl1271_rx(struct wl1271 wl, struct wl1271_fw_status status)
	122	{
	123	struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
	124	u32 buf_size;
	125	u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	126	u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	127	u32 mem_block;
	128
	129	while (drv_rx_counter != fw_rx_counter) {
	130	mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
	131	buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
	132
	133	if (buf_size == 0) {
	134	wl1271_warning("received empty data");
	135	break;
	136	}
	137
d0f63b20 LC	138	wl->rx_mem_pool_addr.addr = (mem_block << 8) +
d0f63b20 LC	139	le32_to_cpu(wl_mem_map->packet_memory_pool_start);
f5fc0f86 LC	140	wl->rx_mem_pool_addr.addr_extra =
	141	wl->rx_mem_pool_addr.addr + 4;
	142
	143	/* Choose the block we want to read */
7b048c52 TP	144	wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
7b048c52 TP	145	sizeof(wl->rx_mem_pool_addr), false);
f5fc0f86 LC	146
	147	wl1271_rx_handle_data(wl, buf_size);
	148
	149	wl->rx_counter++;
	150	drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	151	}
295cc0bf JO	152
295cc0bf JO	153	wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
f5fc0f86	154	}