drivers/net/wireless/rt2x00/rt2800mmio.c

/*	Copyright (C) 2009 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
 *	Copyright (C) 2009 Alban Browaeys <prahal@yahoo.com>
 *	Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
 *	Copyright (C) 2009 Luis Correia <luis.f.correia@gmail.com>
 *	Copyright (C) 2009 Mattias Nissler <mattias.nissler@gmx.de>
 *	Copyright (C) 2009 Mark Asselstine <asselsm@gmail.com>
 *	Copyright (C) 2009 Xose Vazquez Perez <xose.vazquez@gmail.com>
 *	Copyright (C) 2009 Bart Zolnierkiewicz <bzolnier@gmail.com>
 *	<http://rt2x00.serialmonkey.com>
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	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.,
 *	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*	Module: rt2800mmio
 *	Abstract: rt2800 MMIO device routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>

#include "rt2x00.h"
#include "rt2x00mmio.h"
#include "rt2800lib.h"
#include "rt2800mmio.h"

/*
 * TX descriptor initialization
 */
__le32 *rt2800mmio_get_txwi(struct queue_entry *entry)
{
	return (__le32 *) entry->skb->data;
}
EXPORT_SYMBOL_GPL(rt2800mmio_get_txwi);

void rt2800mmio_write_tx_desc(struct queue_entry *entry,
			      struct txentry_desc *txdesc)
{
	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
	struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
	__le32 *txd = entry_priv->desc;
	u32 word;
	const unsigned int txwi_size = entry->queue->winfo_size;

	/*
	 * The buffers pointed by SD_PTR0/SD_LEN0 and SD_PTR1/SD_LEN1
	 * must contains a TXWI structure + 802.11 header + padding + 802.11
	 * data. We choose to have SD_PTR0/SD_LEN0 only contains TXWI and
	 * SD_PTR1/SD_LEN1 contains 802.11 header + padding + 802.11
	 * data. It means that LAST_SEC0 is always 0.
	 */

	/*
	 * Initialize TX descriptor
	 */
	word = 0;
	rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
	rt2x00_desc_write(txd, 0, word);

	word = 0;
	rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
	rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
			   !test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
	rt2x00_set_field32(&word, TXD_W1_BURST,
			   test_bit(ENTRY_TXD_BURST, &txdesc->flags));
	rt2x00_set_field32(&word, TXD_W1_SD_LEN0, txwi_size);
	rt2x00_set_field32(&word, TXD_W1_LAST_SEC0, 0);
	rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
	rt2x00_desc_write(txd, 1, word);

	word = 0;
	rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
			   skbdesc->skb_dma + txwi_size);
	rt2x00_desc_write(txd, 2, word);

	word = 0;
	rt2x00_set_field32(&word, TXD_W3_WIV,
			   !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
	rt2x00_set_field32(&word, TXD_W3_QSEL, 2);
	rt2x00_desc_write(txd, 3, word);

	/*
	 * Register descriptor details in skb frame descriptor.
	 */
	skbdesc->desc = txd;
	skbdesc->desc_len = TXD_DESC_SIZE;
}
EXPORT_SYMBOL_GPL(rt2800mmio_write_tx_desc);

/*
 * RX control handlers
 */
void rt2800mmio_fill_rxdone(struct queue_entry *entry,
			    struct rxdone_entry_desc *rxdesc)
{
	struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
	__le32 *rxd = entry_priv->desc;
	u32 word;

	rt2x00_desc_read(rxd, 3, &word);

	if (rt2x00_get_field32(word, RXD_W3_CRC_ERROR))
		rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;

	/*
	 * Unfortunately we don't know the cipher type used during
	 * decryption. This prevents us from correct providing
	 * correct statistics through debugfs.
	 */
	rxdesc->cipher_status = rt2x00_get_field32(word, RXD_W3_CIPHER_ERROR);

	if (rt2x00_get_field32(word, RXD_W3_DECRYPTED)) {
		/*
		 * Hardware has stripped IV/EIV data from 802.11 frame during
		 * decryption. Unfortunately the descriptor doesn't contain
		 * any fields with the EIV/IV data either, so they can't
		 * be restored by rt2x00lib.
		 */
		rxdesc->flags |= RX_FLAG_IV_STRIPPED;

		/*
		 * The hardware has already checked the Michael Mic and has
		 * stripped it from the frame. Signal this to mac80211.
		 */
		rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;

		if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
			rxdesc->flags |= RX_FLAG_DECRYPTED;
		else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
			rxdesc->flags |= RX_FLAG_MMIC_ERROR;
	}

	if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
		rxdesc->dev_flags |= RXDONE_MY_BSS;

	if (rt2x00_get_field32(word, RXD_W3_L2PAD))
		rxdesc->dev_flags |= RXDONE_L2PAD;

	/*
	 * Process the RXWI structure that is at the start of the buffer.
	 */
	rt2800_process_rxwi(entry, rxdesc);
}
EXPORT_SYMBOL_GPL(rt2800mmio_fill_rxdone);

MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2800 MMIO library");
MODULE_LICENSE("GPL");