[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wireless / wl12xx / 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 "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;
	}
}
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
00d20100 SL	26	#include "wl12xx.h"
	27	#include "acx.h"
	28	#include "reg.h"
	29	#include "rx.h"
	30	#include "io.h"
f5fc0f86	31
c8bde243	32	static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status,
f5fc0f86 LC	33	u32 drv_rx_counter)
f5fc0f86 LC	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	}
f5fc0f86 LC	38
c8bde243	39	static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status,
f5fc0f86 LC	40	u32 drv_rx_counter)
f5fc0f86 LC	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
6a2de93b	53	if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
0af0467f	54	status->band = IEEE80211_BAND_2GHZ;
6a2de93b	55	else
0af0467f	56	status->band = IEEE80211_BAND_5GHZ;
6a2de93b	57
0af0467f	58	status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band);
a4102645	59
00d20100	60	#ifdef CONFIG_WL12XX_HT
18357850 SL	61	/* 11n support */
	62	if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
	63	status->flag \|= RX_FLAG_HT;
	64	#endif
	65
f5fc0f86 LC	66	status->signal = desc->rssi;
f5fc0f86 LC	67
ece550d0 JL	68	/*
	69	* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
	70	* need to divide by two for now, but TI has been discussing about
	71	* changing it. This needs to be rechecked.
	72	*/
	73	wl->noise = desc->rssi - (desc->snr >> 1);
	74
0af0467f JO	75	status->freq = ieee80211_channel_to_frequency(desc->channel,
0af0467f JO	76	status->band);
f5fc0f86 LC	77
f5fc0f86 LC	78	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
34c8e3d2	79	u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
f5fc0f86	80
34c8e3d2 AN	81	status->flag \|= RX_FLAG_IV_STRIPPED \| RX_FLAG_MMIC_STRIPPED \|
	82	RX_FLAG_DECRYPTED;
	83
	84	if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
5d07b668	85	status->flag \|= RX_FLAG_MMIC_ERROR;
34c8e3d2 AN	86	wl1271_warning("Michael MIC error");
34c8e3d2 AN	87	}
f5fc0f86	88	}
f5fc0f86 LC	89	}
f5fc0f86 LC	90
1f37cbc9	91	static int wl1271_rx_handle_data(struct wl1271 wl, u8 data, u32 length)
f5fc0f86	92	{
f5fc0f86 LC	93	struct wl1271_rx_descriptor *desc;
f5fc0f86 LC	94	struct sk_buff *skb;
92fe9b5f	95	struct ieee80211_hdr *hdr;
f5fc0f86 LC	96	u8 *buf;
	97	u8 beacon = 0;
	98
93c5bb68 KV	99	/*
	100	* In PLT mode we seem to get frames and mac80211 warns about them,
	101	* workaround this by not retrieving them at all.
	102	*/
	103	if (unlikely(wl->state == WL1271_STATE_PLT))
1f37cbc9	104	return -EINVAL;
93c5bb68	105
34c8e3d2 AN	106	/* the data read starts with the descriptor */
	107	desc = (struct wl1271_rx_descriptor *) data;
	108
	109	switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
	110	/* discard corrupted packets */
	111	case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
	112	case WL1271_RX_DESC_DECRYPT_FAIL:
	113	wl1271_warning("corrupted packet in RX with status: 0x%x",
	114	desc->status & WL1271_RX_DESC_STATUS_MASK);
	115	return -EINVAL;
	116	case WL1271_RX_DESC_SUCCESS:
	117	case WL1271_RX_DESC_MIC_FAIL:
	118	break;
	119	default:
	120	wl1271_error("invalid RX descriptor status: 0x%x",
	121	desc->status & WL1271_RX_DESC_STATUS_MASK);
	122	return -EINVAL;
	123	}
	124
e9a6269d	125	skb = __dev_alloc_skb(length, GFP_KERNEL);
f5fc0f86 LC	126	if (!skb) {
f5fc0f86 LC	127	wl1271_error("Couldn't allocate RX frame");
1f37cbc9	128	return -ENOMEM;
f5fc0f86 LC	129	}
	130
	131	buf = skb_put(skb, length);
1f37cbc9	132	memcpy(buf, data, length);
f5fc0f86	133
f5fc0f86 LC	134	/* now we pull the descriptor out of the buffer */
	135	skb_pull(skb, sizeof(*desc));
	136
92fe9b5f EP	137	hdr = (struct ieee80211_hdr *)skb->data;
92fe9b5f EP	138	if (ieee80211_is_beacon(hdr->frame_control))
f5fc0f86 LC	139	beacon = 1;
f5fc0f86 LC	140
58be4607	141	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
f5fc0f86	142
a20a5b7e EP	143	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb,
a20a5b7e EP	144	skb->len - desc->pad_len,
f5fc0f86 LC	145	beacon ? "beacon" : "");
f5fc0f86 LC	146
b9f2e39d JO	147	skb_trim(skb, skb->len - desc->pad_len);
b9f2e39d JO	148
a620865e IY	149	skb_queue_tail(&wl->deferred_rx_queue, skb);
a620865e IY	150	ieee80211_queue_work(wl->hw, &wl->netstack_work);
1f37cbc9 IY	151
1f37cbc9 IY	152	return 0;
f5fc0f86 LC	153	}
f5fc0f86 LC	154
c8bde243	155	void wl1271_rx(struct wl1271 wl, struct wl1271_fw_common_status status)
f5fc0f86 LC	156	{
	157	struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
	158	u32 buf_size;
	159	u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	160	u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
1f37cbc9	161	u32 rx_counter;
f5fc0f86	162	u32 mem_block;
1f37cbc9 IY	163	u32 pkt_length;
1f37cbc9 IY	164	u32 pkt_offset;
f5fc0f86 LC	165
f5fc0f86 LC	166	while (drv_rx_counter != fw_rx_counter) {
1f37cbc9 IY	167	buf_size = 0;
	168	rx_counter = drv_rx_counter;
	169	while (rx_counter != fw_rx_counter) {
	170	pkt_length = wl1271_rx_get_buf_size(status, rx_counter);
	171	if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
	172	break;
	173	buf_size += pkt_length;
	174	rx_counter++;
	175	rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
	176	}
f5fc0f86 LC	177
	178	if (buf_size == 0) {
	179	wl1271_warning("received empty data");
	180	break;
	181	}
	182
ae77eccf SL	183	if (wl->chip.id != CHIP_ID_1283_PG20) {
	184	/*
	185	* Choose the block we want to read
	186	* For aggregated packets, only the first memory block
	187	* should be retrieved. The FW takes care of the rest.
	188	*/
	189	mem_block = wl1271_rx_get_mem_block(status,
	190	drv_rx_counter);
	191
	192	wl->rx_mem_pool_addr.addr = (mem_block << 8) +
	193	le32_to_cpu(wl_mem_map->packet_memory_pool_start);
	194
	195	wl->rx_mem_pool_addr.addr_extra =
	196	wl->rx_mem_pool_addr.addr + 4;
	197
	198	wl1271_write(wl, WL1271_SLV_REG_DATA,
	199	&wl->rx_mem_pool_addr,
	200	sizeof(wl->rx_mem_pool_addr), false);
	201	}
1f37cbc9 IY	202
	203	/* Read all available packets at once */
	204	wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
	205	buf_size, true);
	206
	207	/* Split data into separate packets */
	208	pkt_offset = 0;
	209	while (pkt_offset < buf_size) {
	210	pkt_length = wl1271_rx_get_buf_size(status,
	211	drv_rx_counter);
fb2382c7 JO	212	/*
	213	* the handle data call can only fail in memory-outage
	214	* conditions, in that case the received frame will just
	215	* be dropped.
	216	*/
	217	wl1271_rx_handle_data(wl,
	218	wl->aggr_buf + pkt_offset,
	219	pkt_length);
1f37cbc9 IY	220	wl->rx_counter++;
	221	drv_rx_counter++;
	222	drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
	223	pkt_offset += pkt_length;
	224	}
f5fc0f86	225	}
606ea9fa IY	226
	227	/*
	228	* Write the driver's packet counter to the FW. This is only required
	229	* for older hardware revisions
	230	*/
	231	if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
	232	wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
f5fc0f86	233	}
ae113b57 AN	234
	235	void wl1271_set_default_filters(struct wl1271 *wl)
	236	{
	237	if (wl->bss_type == BSS_TYPE_AP_BSS) {
	238	wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG;
	239	wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER;
	240	} else {
	241	wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG;
	242	wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER;
	243	}
	244	}