[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_spi.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;
}

/* 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, 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, &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_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"
	30	#include "wl1271_spi.h"
7b048c52	31	#include "wl1271_io.h"
f5fc0f86 LC	32
	33	static u8 wl1271_rx_get_mem_block(struct wl1271_fw_status *status,
	34	u32 drv_rx_counter)
	35	{
d0f63b20 LC	36	return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
d0f63b20 LC	37	RX_MEM_BLOCK_MASK;
f5fc0f86 LC	38	}
	39
	40	static u32 wl1271_rx_get_buf_size(struct wl1271_fw_status *status,
	41	u32 drv_rx_counter)
	42	{
d0f63b20 LC	43	return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
d0f63b20 LC	44	RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
f5fc0f86 LC	45	}
	46
	47	/* The values of this table must match the wl1271_rates[] array */
	48	static u8 wl1271_rx_rate_to_idx[] = {
	49	/* MCS rates are used only with 11n */
	50	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
	51	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
	52	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
	53	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
	54	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
	55	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
	56	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
	57	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
	58
	59	11, /* WL1271_RATE_54 */
	60	10, /* WL1271_RATE_48 */
	61	9, /* WL1271_RATE_36 */
	62	8, /* WL1271_RATE_24 */
	63
	64	/* TI-specific rate */
	65	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */
	66
	67	7, /* WL1271_RATE_18 */
	68	6, /* WL1271_RATE_12 */
	69	3, /* WL1271_RATE_11 */
	70	5, /* WL1271_RATE_9 */
	71	4, /* WL1271_RATE_6 */
	72	2, /* WL1271_RATE_5_5 */
	73	1, /* WL1271_RATE_2 */
	74	0 /* WL1271_RATE_1 */
	75	};
	76
a4102645 TP	77	/* The values of this table must match the wl1271_rates[] array */
	78	static u8 wl1271_5_ghz_rx_rate_to_idx[] = {
	79	/* MCS rates are used only with 11n */
	80	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS7 */
	81	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS6 */
	82	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS5 */
	83	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS4 */
	84	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS3 */
	85	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS2 */
	86	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS1 */
	87	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_MCS0 */
	88
	89	7, /* WL1271_RATE_54 */
	90	6, /* WL1271_RATE_48 */
	91	5, /* WL1271_RATE_36 */
	92	4, /* WL1271_RATE_24 */
	93
	94	/* TI-specific rate */
	95	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_22 */
	96
	97	3, /* WL1271_RATE_18 */
	98	2, /* WL1271_RATE_12 */
	99	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_11 */
	100	1, /* WL1271_RATE_9 */
	101	0, /* WL1271_RATE_6 */
	102	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_5_5 */
	103	WL1271_RX_RATE_UNSUPPORTED, /* WL1271_RATE_2 */
	104	WL1271_RX_RATE_UNSUPPORTED /* WL1271_RATE_1 */
	105	};
	106
f5fc0f86 LC	107	static void wl1271_rx_status(struct wl1271 *wl,
	108	struct wl1271_rx_descriptor *desc,
	109	struct ieee80211_rx_status *status,
	110	u8 beacon)
	111	{
	112	memset(status, 0, sizeof(struct ieee80211_rx_status));
	113
a4102645 TP	114	if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
a4102645 TP	115	WL1271_RX_DESC_BAND_BG) {
f5fc0f86	116	status->band = IEEE80211_BAND_2GHZ;
a4102645 TP	117	status->rate_idx = wl1271_rx_rate_to_idx[desc->rate];
	118	} else if ((desc->flags & WL1271_RX_DESC_BAND_MASK) ==
	119	WL1271_RX_DESC_BAND_A) {
abb0b3bf	120	status->band = IEEE80211_BAND_5GHZ;
a4102645 TP	121	status->rate_idx = wl1271_5_ghz_rx_rate_to_idx[desc->rate];
a4102645 TP	122	} else
f5fc0f86 LC	123	wl1271_warning("unsupported band 0x%x",
	124	desc->flags & WL1271_RX_DESC_BAND_MASK);
	125
a4102645 TP	126	if (unlikely(status->rate_idx == WL1271_RX_RATE_UNSUPPORTED))
	127	wl1271_warning("unsupported rate");
	128
f5fc0f86 LC	129	/*
	130	* FIXME: Add mactime handling. For IBSS (ad-hoc) we need to get the
	131	* timestamp from the beacon (acx_tsf_info). In BSS mode (infra) we
	132	* only need the mactime for monitor mode. For now the mactime is
	133	* not valid, so RX_FLAG_TSFT should not be set
	134	*/
	135	status->signal = desc->rssi;
	136
f5fc0f86 LC	137	/*
	138	* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
	139	* need to divide by two for now, but TI has been discussing about
	140	* changing it. This needs to be rechecked.
	141	*/
	142	status->noise = desc->rssi - (desc->snr >> 1);
	143
	144	status->freq = ieee80211_channel_to_frequency(desc->channel);
	145
	146	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
	147	status->flag \|= RX_FLAG_IV_STRIPPED \| RX_FLAG_MMIC_STRIPPED;
	148
5d07b668	149	if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
f5fc0f86	150	status->flag \|= RX_FLAG_DECRYPTED;
5d07b668 TP	151	if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
5d07b668 TP	152	status->flag \|= RX_FLAG_MMIC_ERROR;
f5fc0f86	153	}
f5fc0f86 LC	154	}
	155
	156	static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
	157	{
	158	struct ieee80211_rx_status rx_status;
	159	struct wl1271_rx_descriptor *desc;
	160	struct sk_buff *skb;
	161	u16 *fc;
	162	u8 *buf;
	163	u8 beacon = 0;
	164
e9a6269d	165	skb = __dev_alloc_skb(length, GFP_KERNEL);
f5fc0f86 LC	166	if (!skb) {
	167	wl1271_error("Couldn't allocate RX frame");
	168	return;
	169	}
	170
	171	buf = skb_put(skb, length);
7b048c52	172	wl1271_read(wl, WL1271_SLV_MEM_DATA, buf, length, true);
f5fc0f86 LC	173
	174	/* the data read starts with the descriptor */
	175	desc = (struct wl1271_rx_descriptor *) buf;
	176
	177	/* now we pull the descriptor out of the buffer */
	178	skb_pull(skb, sizeof(*desc));
	179
	180	fc = (u16 *)skb->data;
	181	if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
	182	beacon = 1;
	183
	184	wl1271_rx_status(wl, desc, &rx_status, beacon);
	185
	186	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
	187	beacon ? "beacon" : "");
	188
	189	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
287d3741	190	ieee80211_rx_ni(wl->hw, skb);
f5fc0f86 LC	191	}
	192
	193	void wl1271_rx(struct wl1271 wl, struct wl1271_fw_status status)
	194	{
	195	struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
	196	u32 buf_size;
	197	u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	198	u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	199	u32 mem_block;
	200
	201	while (drv_rx_counter != fw_rx_counter) {
	202	mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
	203	buf_size = wl1271_rx_get_buf_size(status, drv_rx_counter);
	204
	205	if (buf_size == 0) {
	206	wl1271_warning("received empty data");
	207	break;
	208	}
	209
d0f63b20 LC	210	wl->rx_mem_pool_addr.addr = (mem_block << 8) +
d0f63b20 LC	211	le32_to_cpu(wl_mem_map->packet_memory_pool_start);
f5fc0f86 LC	212	wl->rx_mem_pool_addr.addr_extra =
	213	wl->rx_mem_pool_addr.addr + 4;
	214
	215	/* Choose the block we want to read */
7b048c52 TP	216	wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
7b048c52 TP	217	sizeof(wl->rx_mem_pool_addr), false);
f5fc0f86 LC	218
	219	wl1271_rx_handle_data(wl, buf_size);
	220
	221	wl->rx_counter++;
	222	drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
7b048c52	223	wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
f5fc0f86	224	}
f5fc0f86	225	}