path: root/drivers/net/wireless/b43/xmit.c

/*

  Broadcom B43 wireless driver

  Transmission (TX/RX) related functions.

  Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
  Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
  Copyright (C) 2005, 2006 Michael Buesch <m@bues.ch>
  Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
  Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>

  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; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "xmit.h"
#include "phy_common.h"
#include "dma.h"
#include "pio.h"

static const struct b43_tx_legacy_rate_phy_ctl_entry b43_tx_legacy_rate_phy_ctl[] = {
	{ B43_CCK_RATE_1MB,	0x0,			0x0 },
	{ B43_CCK_RATE_2MB,	0x0,			0x1 },
	{ B43_CCK_RATE_5MB,	0x0,			0x2 },
	{ B43_CCK_RATE_11MB,	0x0,			0x3 },
	{ B43_OFDM_RATE_6MB,	B43_TXH_PHY1_CRATE_1_2,	B43_TXH_PHY1_MODUL_BPSK },
	{ B43_OFDM_RATE_9MB,	B43_TXH_PHY1_CRATE_3_4,	B43_TXH_PHY1_MODUL_BPSK },
	{ B43_OFDM_RATE_12MB,	B43_TXH_PHY1_CRATE_1_2,	B43_TXH_PHY1_MODUL_QPSK },
	{ B43_OFDM_RATE_18MB,	B43_TXH_PHY1_CRATE_3_4,	B43_TXH_PHY1_MODUL_QPSK },
	{ B43_OFDM_RATE_24MB,	B43_TXH_PHY1_CRATE_1_2,	B43_TXH_PHY1_MODUL_QAM16 },
	{ B43_OFDM_RATE_36MB,	B43_TXH_PHY1_CRATE_3_4,	B43_TXH_PHY1_MODUL_QAM16 },
	{ B43_OFDM_RATE_48MB,	B43_TXH_PHY1_CRATE_2_3,	B43_TXH_PHY1_MODUL_QAM64 },
	{ B43_OFDM_RATE_54MB,	B43_TXH_PHY1_CRATE_3_4,	B43_TXH_PHY1_MODUL_QAM64 },
};

static const struct b43_tx_legacy_rate_phy_ctl_entry *
b43_tx_legacy_rate_phy_ctl_ent(u8 bitrate)
{
	const struct b43_tx_legacy_rate_phy_ctl_entry *e;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(b43_tx_legacy_rate_phy_ctl); i++) {
		e = &(b43_tx_legacy_rate_phy_ctl[i]);
		if (e->bitrate == bitrate)
			return e;
	}

	B43_WARN_ON(1);
	return NULL;
}

/* Extract the bitrate index out of a CCK PLCP header. */
static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
{
	switch (plcp->raw[0]) {
	case 0x0A:
		return 0;
	case 0x14:
		return 1;
	case 0x37:
		return 2;
	case 0x6E:
		return 3;
	}
	return -1;
}

/* Extract the bitrate index out of an OFDM PLCP header. */
static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
{
	int base = aphy ? 0 : 4;

	switch (plcp->raw[0] & 0xF) {
	case 0xB:
		return base + 0;
	case 0xF:
		return base + 1;
	case 0xA:
		return base + 2;
	case 0xE:
		return base + 3;
	case 0x9:
		return base + 4;
	case 0xD:
		return base + 5;
	case 0x8:
		return base + 6;
	case 0xC:
		return base + 7;
	}
	return -1;
}

u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
{
	switch (bitrate) {
	case B43_CCK_RATE_1MB:
		return 0x0A;
	case B43_CCK_RATE_2MB:
		return 0x14;
	case B43_CCK_RATE_5MB:
		return 0x37;
	case B43_CCK_RATE_11MB:
		return 0x6E;
	}
	B43_WARN_ON(1);
	return 0;
}

u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
{
	switch (bitrate) {
	case B43_OFDM_RATE_6MB:
		return 0xB;
	case B43_OFDM_RATE_9MB:
		return 0xF;
	case B43_OFDM_RATE_12MB:
		return 0xA;
	case B43_OFDM_RATE_18MB:
		return 0xE;
	case B43_OFDM_RATE_24MB:
		return 0x9;
	case B43_OFDM_RATE_36MB:
		return 0xD;
	case B43_OFDM_RATE_48MB:
		return 0x8;
	case B43_OFDM_RATE_54MB:
		return 0xC;
	}
	B43_WARN_ON(1);
	return 0;
}

void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
			   const u16 octets, const u8 bitrate)
{
	__u8 *raw = plcp->raw;

	if (b43_is_ofdm_rate(bitrate)) {
		u32 d;

		d = b43_plcp_get_ratecode_ofdm(bitrate);
		B43_WARN_ON(octets & 0xF000);
		d |= (octets << 5);
		plcp->data = cpu_to_le32(d);
	} else {
		u32 plen;

		plen = octets * 16 / bitrate;
		if ((octets * 16 % bitrate) > 0) {
			plen++;
			if ((bitrate == B43_CCK_RATE_11MB)
			    && ((octets * 8 %