rt61pci.c

/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<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: rt61pci
	Abstract: rt61pci device specific routines.
	Supported chipsets: RT2561, RT2561s, RT2661.
 */

#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/eeprom_93cx6.h>

#include "rt2x00.h"
#include "rt2x00pci.h"
#include "rt61pci.h"

/*
 * Register access.
 * BBP and RF register require indirect register access,
 * and use the CSR registers PHY_CSR3 and PHY_CSR4 to achieve this.
 * These indirect registers work with busy bits,
 * and we will try maximal REGISTER_BUSY_COUNT times to access
 * the register while taking a REGISTER_BUSY_DELAY us delay
 * between each attampt. When the busy bit is still set at that time,
 * the access attempt is considered to have failed,
 * and we will print an error.
 */
static u32 rt61pci_bbp_check(struct rt2x00_dev *rt2x00dev)
{
	u32 reg;
	unsigned int i;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt2x00pci_register_read(rt2x00dev, PHY_CSR3, &reg);
		if (!rt2x00_get_field32(reg, PHY_CSR3_BUSY))
			break;
		udelay(REGISTER_BUSY_DELAY);
	}

	return reg;
}

static void rt61pci_bbp_write(struct rt2x00_dev *rt2x00dev,
			      const unsigned int word, const u8 value)
{
	u32 reg;

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt61pci_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Write failed.\n");
		return;
	}

	/*
	 * Write the data into the BBP.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR3_VALUE, value);
	rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
	rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
	rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 0);

	rt2x00pci_register_write(rt2x00dev, PHY_CSR3, reg);
}

static void rt61pci_bbp_read(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, u8 *value)
{
	u32 reg;

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt61pci_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
		return;
	}

	/*
	 * Write the request into the BBP.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
	rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
	rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 1);

	rt2x00pci_register_write(rt2x00dev, PHY_CSR3, reg);

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt61pci_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
		*value = 0xff;
		return;
	}

	*value = rt2x00_get_field32(reg, PHY_CSR3_VALUE);
}

static void rt61pci_rf_write(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, const u32 value)
{
	u32 reg;
	unsigned int i;

	if (!word)
		return;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt2x00pci_register_read(rt2x00dev, PHY_CSR4, &reg);
		if (!rt2x00_get_field32(reg, PHY_CSR4_BUSY))
			goto rf_write;
		udelay(REGISTER_BUSY_DELAY);
	}

	ERROR(rt2x00dev, "PHY_CSR4 register busy. Write failed.\n");
	return;

rf_write:
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR4_VALUE, value);
	rt2x00_set_field32(&reg, PHY_CSR4_NUMBER_OF_BITS, 21);
	rt2x00_set_field32(&reg, PHY_CSR4_IF_SELECT, 0);
	rt2x00_set_field32(&reg, PHY_CSR4_BUSY, 1);

	rt2x00pci_register_write(rt2x00dev, PHY_CSR4, reg);
	rt2x00_rf_write(rt2x00dev, word, value);
}

#ifdef CONFIG_RT61PCI_LEDS
/*
 * This function is only called from rt61pci_led_brightness()
 * make gcc happy by placing this function inside the
 * same ifdef statement as the caller.
 */
static void rt61pci_mcu_request(struct rt2x00_dev *rt2x00dev,
				const u8 command, const u8 token,
				const u8 arg0, const u8 arg1)
{
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, H2M_MAILBOX_CSR, &reg);

	if (rt2x00_get_field32(reg, H2M_MAILBOX_CSR_OWNER)) {
		ERROR(rt2x00dev, "mcu request error. "
		      "Request 0x%02x failed for token 0x%02x.\n",
		      command, token);
		return;
	}

	rt2x00_set_field32(&reg, H2M_MAILBOX_CSR_OWNER, 1);
	rt2x00_set_field32(&reg, H2M_MAILBOX_CSR_CMD_TOKEN, token);
	rt2x00_set_field32(&reg, H2M_MAILBOX_CSR_ARG0, arg0);
	rt2x00_set_field32(&reg, H2M_MAILBOX_CSR_ARG1, arg1);
	rt2x00pci_register_write(rt2x00dev, H2M_MAILBOX_CSR, reg);

	rt2x00pci_register_read(rt2x00dev, HOST_CMD_CSR, &reg);
	rt2x00_set_field32(&reg, HOST_CMD_CSR_HOST_COMMAND, command);
	rt2x00_set_field32(&reg, HOST_CMD_CSR_INTERRUPT_MCU, 1);
	rt2x00pci_register_write(rt2x00dev, HOST_CMD_CSR, reg);
}
#endif /* CONFIG_RT61PCI_LEDS */

static void rt61pci_eepromregister_read(struct eeprom_93cx6 *eeprom)
{
	struct rt2x00_dev *rt2x00dev = eeprom->data;
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, E2PROM_CSR, &reg);

	eeprom->reg_data_in = !!rt2x00_get_field32(reg, E2PROM_CSR_DATA_IN);
	eeprom->reg_data_out = !!rt2x00_get_field32(reg, E2PROM_CSR_DATA_OUT);
	eeprom->reg_data_clock =
	    !!rt2x00_get_field32(reg, E2PROM_CSR_DATA_CLOCK);
	eeprom->reg_chip_select =
	    !!rt2x00_get_field32(reg, E2PROM_CSR_CHIP_SELECT);
}

static void rt61pci_eepromregister_write(struct eeprom_93cx6 *eeprom)
{
	struct rt2x00_dev *rt2x00dev = eeprom->data;
	u32 reg = 0;

	rt2x00_set_field32(&reg, E2PROM_CSR_DATA_IN, !!eeprom->reg_data_in);
	rt2x00_set_field32(&reg, E2PROM_CSR_DATA_OUT, !!eeprom->reg_data_out);
	rt2x00_set_field32(&reg, E2PROM_CSR_DATA_CLOCK,
			   !!eeprom->reg_data_clock);
	rt2x00_set_field32(&reg, E2PROM_CSR_CHIP_SELECT,
			   !!eeprom->reg_chip_select);

	rt2x00pci_register_write(rt2x00dev, E2PROM_CSR, reg);
}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
#define CSR_OFFSET(__word)	( CSR_REG_BASE + ((__word) * sizeof(u32)) )

static void rt61pci_read_csr(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, u32 *data)
{
	rt2x00pci_register_read(rt2x00dev, CSR_OFFSET(word), data);
}

static void rt61pci_write_csr(struct rt2x00_dev *rt2x00dev,
			      const unsigned int word, u32 data)
{
	rt2x00pci_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt61pci_rt2x00debug = {
	.owner	= THIS_MODULE,
	.csr	= {
		.read		= rt61pci_read_csr,
		.write		= rt61pci_write_csr,
		.word_size	= sizeof(u32),
		.word_count	= CSR_REG_SIZE / sizeof(u32),
	},
	.eeprom	= {
		.read		= rt2x00_eeprom_read,
		.write		= rt2x00_eeprom_write,
		.word_size	= sizeof(u16),
		.word_count	= EEPROM_SIZE / sizeof(u16),
	},
	.bbp	= {
		.read		= rt61pci_bbp_read,
		.write		= rt61pci_bbp_write,
		.word_size	= sizeof(u8),
		.word_count	= BBP_SIZE / sizeof(u8),
	},
	.rf	= {
		.read		= rt2x00_rf_read,
		.write		= rt61pci_rf_write,
		.word_size	= sizeof(u32),
		.word_count	= RF_SIZE / sizeof(u32),
	},
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

#ifdef CONFIG_RT61PCI_RFKILL
static int rt61pci_rfkill_poll(struct rt2x00_dev *rt2x00dev)
{
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, MAC_CSR13, &reg);
	return rt2x00_get_field32(reg, MAC_CSR13_BIT5);
}
#else
#define rt61pci_rfkill_poll	NULL
#endif /* CONFIG_RT61PCI_RFKILL */

#ifdef CONFIG_RT61PCI_LEDS
static void rt61pci_led_brightness(struct led_classdev *led_cdev,
				   enum led_brightness brightness)
{
	struct rt2x00_led *led =
	    container_of(led_cdev, struct rt2x00_led, led_dev);
	unsigned int enabled = brightness != LED_OFF;
	unsigned int a_mode =
	    (enabled && led->rt2x00dev->curr_band == IEEE80211_BAND_5GHZ);
	unsigned int bg_mode =
	    (enabled && led->rt2x00dev->curr_band == IEEE80211_BAND_2GHZ);

	if (led->type == LED_TYPE_RADIO) {
		rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
				   MCU_LEDCS_RADIO_STATUS, enabled);

		rt61pci_mcu_request(led->rt2x00dev, MCU_LED, 0xff,
				    (led->rt2x00dev->led_mcu_reg & 0xff),
				    ((led->rt2x00dev->led_mcu_reg >> 8)));
	} else if (led->type == LED_TYPE_ASSOC) {
		rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
				   MCU_LEDCS_LINK_BG_STATUS, bg_mode);
		rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
				   MCU_LEDCS_LINK_A_STATUS, a_mode);

		rt61pci_mcu_request(led->rt2x00dev, MCU_LED, 0xff,
				    (led->rt2x00dev->led_mcu_reg & 0xff),
				    ((led->rt2x00dev->led_mcu_reg >> 8)));
	} else if (led->type == LED_TYPE_QUALITY) {
		/*
		 * The brightness is divided into 6 levels (0 - 5),
		 * this means we need to convert the brightness
		 * argument into the matching level within that range.
		 */
		rt61pci_mcu_request(led->rt2x00dev, MCU_LED_STRENGTH, 0xff,
				    brightness / (LED_FULL / 6), 0);
	}
}
#else
#define rt61pci_led_brightness	NULL
#endif /* CONFIG_RT61PCI_LEDS */

/*
 * Configuration handlers.
 */
static void rt61pci_config_intf(struct rt2x00_dev *rt2x00dev,
				struct rt2x00_intf *intf,
				struct rt2x00intf_conf *conf,
				const unsigned int flags)
{
	unsigned int beacon_base;
	u32 reg;

	if (flags & CONFIG_UPDATE_TYPE) {
		/*
		 * Clear current synchronisation setup.
		 * For the Beacon base registers we only need to clear
		 * the first byte since that byte contains the VALID and OWNER
		 * bits which (when set to 0) will invalidate the entire beacon.
		 */
		beacon_base = HW_BEACON_OFFSET(intf->beacon->entry_idx);
		rt2x00pci_register_write(rt2x00dev, beacon_base, 0);

		/*
		 * Enable synchronisation.
		 */
		rt2x00pci_register_read(rt2x00dev, TXRX_CSR9, &reg);
		rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 1);
		rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, conf->sync);
		rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 1);
		rt2x00pci_register_write(rt2x00dev, TXRX_CSR9, reg);
	}

	if (flags & CONFIG_UPDATE_MAC) {
		reg = le32_to_cpu(conf->mac[1]);
		rt2x00_set_field32(&reg, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
		conf->mac[1] = cpu_to_le32(reg);

		rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR2,
					      conf->mac, sizeof(conf->mac));
	}

	if (flags & CONFIG_UPDATE_BSSID) {
		reg = le32_to_cpu(conf->bssid[1]);
		rt2x00_set_field32(&reg, MAC_CSR5_BSS_ID_MASK, 3);
		conf->bssid[1] = cpu_to_le32(reg);

		rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR4,
					      conf->bssid, sizeof(conf->bssid));
	}
}

static int rt61pci_config_erp(struct rt2x00_dev *rt2x00dev,
			      struct rt2x00lib_erp *erp)
{
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, erp->ack_timeout);
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt2x00pci_register_read(rt2x00dev, TXRX_CSR4, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_PREAMBLE,
			   !!erp->short_preamble);
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR4, reg);

	return 0;
}

static void rt61pci_config_phymode(struct rt2x00_dev *rt2x00dev,
				   const int basic_rate_mask)
{
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR5, basic_rate_mask);
}

static void rt61pci_config_channel(struct rt2x00_dev *rt2x00dev,
				   struct rf_channel *rf, const int txpower)
{
	u8 r3;
	u8 r94;
	u8 smart;

	rt2x00_set_field32(&rf->rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
	rt2x00_set_field32(&rf->rf4, RF4_FREQ_OFFSET, rt2x00dev->freq_offset);

	smart = !(rt2x00_rf(&rt2x00dev->chip, RF5225) ||
		  rt2x00_rf(&rt2x00dev->chip, RF2527));

	rt61pci_bbp_read(rt2x00dev, 3, &r3);
	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, smart);
	rt61pci_bbp_write(rt2x00dev, 3, r3);

	r94 = 6;
	if (txpower > MAX_TXPOWER && txpower <= (MAX_TXPOWER + r94))
		r94 += txpower - MAX_TXPOWER;
	else if (txpower < MIN_TXPOWER && txpower >= (MIN_TXPOWER - r94))
		r94 += txpower;
	rt61pci_bbp_write(rt2x00dev, 94, r94);

	rt61pci_rf_write(rt2x00dev, 1, rf->rf1);
	rt61pci_rf_write(rt2x00dev, 2, rf->rf2);
	rt61pci_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
	rt61pci_rf_write(rt2x00dev, 4, rf->rf4);

	udelay(200);

	rt61pci_rf_write(rt2x00dev, 1, rf->rf1);
	rt61pci_rf_write(rt2x00dev, 2, rf->rf2);
	rt61pci_rf_write(rt2x00dev, 3, rf->rf3 | 0x00000004);
	rt61pci_rf_write(rt2x00dev, 4, rf->rf4);

	udelay(200);

	rt61pci_rf_write(rt2x00dev, 1, rf->rf1);
	rt61pci_rf_write(rt2x00dev, 2, rf->rf2);
	rt61pci_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
	rt61pci_rf_write(rt2x00dev, 4, rf->rf4);

	msleep(1);
}

static void rt61pci_config_txpower(struct rt2x00_dev *rt2x00dev,
				   const int txpower)
{
	struct rf_channel rf;

	rt2x00_rf_read(rt2x00dev, 1, &rf.rf1);
	rt2x00_rf_read(rt2x00dev, 2, &rf.rf2);
	rt2x00_rf_read(rt2x00dev, 3, &rf.rf3);
	rt2x00_rf_read(rt2x00dev, 4, &rf.rf4);

	rt61pci_config_channel(rt2x00dev, &rf, txpower);
}

static void rt61pci_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
				      struct antenna_setup *ant)
{
	u8 r3;
	u8 r4;
	u8 r77;

	rt61pci_bbp_read(rt2x00dev, 3, &r3);
	rt61pci_bbp_read(rt2x00dev, 4, &r4);
	rt61pci_bbp_read(rt2x00dev, 77, &r77);

	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE,
			  rt2x00_rf(&rt2x00dev->chip, RF5325));

	/*
	 * Configure the RX antenna.
	 */
	switch (ant->rx) {
	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
				  (rt2x00dev->curr_band != IEEE80211_BAND_5GHZ));
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
		if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ)
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		else
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		break;
	case ANTENNA_B:
	default:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
		if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ)
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		else
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		break;
	}

	rt61pci_bbp_write(rt2x00dev, 77, r77);
	rt61pci_bbp_write(rt2x00dev, 3, r3);
	rt61pci_bbp_write(rt2x00dev, 4, r4);
}

static void rt61pci_config_antenna_2x(struct rt2x00_dev *rt2x00dev,
				      struct antenna_setup *ant)
{
	u8 r3;
	u8 r4;
	u8 r77;

	rt61pci_bbp_read(rt2x00dev, 3, &r3);
	rt61pci_bbp_read(rt2x00dev, 4, &r4);
	rt61pci_bbp_read(rt2x00dev, 77, &r77);

	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE,
			  rt2x00_rf(&rt2x00dev->chip, RF2529));
	rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
			  !test_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags));

	/*
	 * Configure the RX antenna.
	 */
	switch (ant->rx) {
	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		break;
	case ANTENNA_B:
	default:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		break;
	}

	rt61pci_bbp_write(rt2x00dev, 77, r77);
	rt61pci_bbp_write(rt2x00dev, 3, r3);
	rt61pci_bbp_write(rt2x00dev, 4, r4);
}

static void rt61pci_config_antenna_2529_rx(struct rt2x00_dev *rt2x00dev,
					   const int p1, const int p2)
{
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, MAC_CSR13, &reg);

	rt2x00_set_field32(&reg, MAC_CSR13_BIT4, p1);
	rt2x00_set_field32(&reg, MAC_CSR13_BIT12, 0);

	rt2x00_set_field32(&reg, MAC_CSR13_BIT3, !p2);
	rt2x00_set_field32(&reg, MAC_CSR13_BIT11, 0);

	rt2x00pci_register_write(rt2x00dev, MAC_CSR13, reg);
}

static void rt61pci_config_antenna_2529(struct rt2x00_dev *rt2x00dev,
					struct antenna_setup *ant)
{
	u8 r3;
	u8 r4;
	u8 r77;

	rt61pci_bbp_read(rt2x00dev, 3, &r3);
	rt61pci_bbp_read(rt2x00dev, 4, &r4);
	rt61pci_bbp_read(rt2x00dev, 77, &r77);

	/*
	 * Configure the RX antenna.
	 */
	switch (ant->rx) {
	case ANTENNA_A:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 0);
		break;
	case ANTENNA_HW_DIVERSITY:
		/*
		 * FIXME: Antenna selection for the rf 2529 is very confusing
		 * in the legacy driver. Just default to antenna B until the
		 * legacy code can be properly translated into rt2x00 code.
		 */
	case ANTENNA_B:
	default:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 1);
		break;
	}

	rt61pci_bbp_write(rt2x00dev, 77, r77);
	rt61pci_bbp_write(rt2x00dev, 3, r3);
	rt61pci_bbp_write(rt2x00dev, 4, r4);
}

struct antenna_sel {
	u8 word;
	/*
	 * value[0] -> non-LNA
	 * value[1] -> LNA
	 */
	u8 value[2];
};

static const struct antenna_sel antenna_sel_a[] = {
	{ 96,  { 0x58, 0x78 } },
	{ 104, { 0x38, 0x48 } },
	{ 75,  { 0xfe, 0x80 } },
	{ 86,  { 0xfe, 0x80 } },
	{ 88,  { 0xfe, 0x80 } },
	{ 35,  { 0x60, 0x60 } },
	{ 97,  { 0x58, 0x58 } },
	{ 98,  { 0x58, 0x58 } },
};

static const struct antenna_sel antenna_sel_bg[] = {
	{ 96,  { 0x48, 0x68 } },
	{ 104, { 0x2c, 0x3c } },
	{ 75,  { 0xfe, 0x80 } },
	{ 86,  { 0xfe, 0x80 } },
	{ 88,  { 0xfe, 0x80 } },
	{ 35,  { 0x50, 0x50 } },
	{ 97,  { 0x48, 0x48 } },
	{ 98,  { 0x48, 0x48 } },
};

static void rt61pci_config_antenna(struct rt2x00_dev *rt2x00dev,
				   struct antenna_setup *ant)
{
	const struct antenna_sel *sel;
	unsigned int lna;
	unsigned int i;
	u32 reg;

	/*
	 * We should never come here because rt2x00lib is supposed
	 * to catch this and send us the correct antenna explicitely.
	 */
	BUG_ON(ant->rx == ANTENNA_SW_DIVERSITY ||
	       ant->tx == ANTENNA_SW_DIVERSITY);

	if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ) {
		sel = antenna_sel_a;
		lna = test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags);
	} else {
		sel = antenna_sel_bg;
		lna = test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags);
	}

	for (i = 0; i < ARRAY_SIZE(antenna_sel_a); i++)
		rt61pci_bbp_write(rt2x00dev, sel[i].word, sel[i].value[lna]);

	rt2x00pci_register_read(rt2x00dev, PHY_CSR0, &reg);

	rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_BG,
			   rt2x00dev->curr_band == IEEE80211_BAND_2GHZ);
	rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_A,
			   rt2x00dev->curr_band == IEEE80211_BAND_5GHZ);

	rt2x00pci_register_write(rt2x00dev, PHY_CSR0, reg);

	if (rt2x00_rf(&rt2x00dev->chip, RF5225) ||
	    rt2x00_rf(&rt2x00dev->chip, RF5325))
		rt61pci_config_antenna_5x(rt2x00dev, ant);
	else if (rt2x00_rf(&rt2x00dev->chip, RF2527))
		rt61pci_config_antenna_2x(rt2x00dev, ant);
	else if (rt2x00_rf(&rt2x00dev->chip, RF2529)) {
		if (test_bit(CONFIG_DOUBLE_ANTENNA, &rt2x00dev->flags))
			rt61pci_config_antenna_2x(rt2x00dev, ant);
		else
			rt61pci_config_antenna_2529(rt2x00dev, ant);
	}
}

static void rt61pci_config_duration(struct rt2x00_dev *rt2x00dev,
				    struct rt2x00lib_conf *libconf)
{
	u32 reg;

	rt2x00pci_register_read(rt2x00dev, MAC_CSR9, &reg);
	rt2x00_set_field32(&reg, MAC_CSR9_SLOT_TIME, libconf->slot_time);
	rt2x00pci_register_write(rt2x00dev, MAC_CSR9, reg);

	rt2x00pci_register_read(rt2x00dev, MAC_CSR8, &reg);
	rt2x00_set_field32(&reg, MAC_CSR8_SIFS, libconf->sifs);
	rt2x00_set_field32(&reg, MAC_CSR8_SIFS_AFTER_RX_OFDM, 3);
	rt2x00_set_field32(&reg, MAC_CSR8_EIFS, libconf->eifs);
	rt2x00pci_register_write(rt2x00dev, MAC_CSR8, reg);

	rt2x00pci_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt2x00pci_register_read(rt2x00dev, TXRX_CSR4, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_ENABLE, 1);
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR4, reg);

	rt2x00pci_register_read(rt2x00dev, TXRX_CSR9, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_INTERVAL,
			   libconf->conf->beacon_int * 16);
	rt2x00pci_register_write(rt2x00dev, TXRX_CSR9, reg);
}

static void rt61pci_config(struct rt2x00_dev *rt2x00dev,
			   struct rt2x00lib_conf *libconf,
			   const unsigned int flags)
{
	if (flags & CONFIG_UPDATE_PHYMODE)
		rt61pci_config_phymode(rt2x00dev, libconf->basic_rates);
	if (flags & CONFIG_UPDATE_CHANNEL)
		rt61pci_config_channel(rt2x00dev, &libconf->rf,
				       libconf->conf->power_level);
	if ((flags & CONFIG_UPDATE_TXPOWER) && !(flags & CONFIG_UPDATE_CHANNEL))
		rt61pci_config_txpower(rt2x00dev, libconf->conf->power_level);
	if (flags & CONFIG_UPDATE_ANTENNA)
		rt61pci_config_antenna(rt2x00dev, &libconf->ant);
	if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
		rt61pci_config_duration(rt2x00dev, libconf);
}

/*
 * Link tuning
 */
static void rt61pci_link_stats(struct rt2x00_dev *rt2x00dev,
			       struct link_qual *qual)
{
	u32 reg;

	/*
	 * Update FCS error count from register.
	 */
	rt2x00pci_register_read(rt2x00dev, STA_CSR0, &reg);
	qual->rx_failed = rt2x00_get_field32(reg, STA_CSR0_FCS_ERROR);

	/*
	 * Update False CCA count from register.
	 */
	rt2x00pci_register_read(rt2x00dev, STA_CSR1, &reg);
	qual->false_cca = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
}

static void rt61pci_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
	rt61pci_bbp_write(rt2x00dev, 17, 0x20);
	rt2x00dev->link.vgc_level = 0x20;
}

static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
{
	int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
	u8 r17;
	u8 up_bound;
	u8 low_bound;

	rt61pci_bbp_read(rt2x00dev, 17, &r17);

	/*
	 * Determine r17 bounds.
	 */
	if (rt2x00dev->rx_status.band == IEEE80211_BAND_5GHZ) {
		low_bound = 0x28;
		up_bound = 0x48;
		if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags)) {
			low_bound += 0x10;
			up_bound += 0x10;
		}
	} else {
		low_bound = 0x20;
		up_bound = 0x40;
		if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags)) {
			low_bound += 0x10;
			up_bound += 0x10;
		}
	}

	/*
	 * If we are not associated, we should go straight to the
	 * dynamic CCA tuning.
	 */
	if (!rt2x00dev->intf_associated)
		goto dynamic_cca_tune;

	/*
	 * Special big-R17 for very short distance
	 */
	if (rssi >= -35) {
		if (r17 != 0x60)
			rt61pci_bbp_write(rt2x00dev, 17, 0x60);
		return;
	}

	/*
	 * Special big-R17 for short distance
	 */
	if (rssi >= -58) {
		if (r17 != up_bound)
			rt61pci_bbp_write(rt2x00dev, 17, up_bound);
		return;
	}

	/*
	 * Special big-R17 for middle-short distance
	 */
	if (rssi >= -66) {
		low_bound += 0x10;
		if (r17 != low_bound)
			rt61pci_bbp_write(rt2x00dev, 17, low_bound);
		return;
	}

	/*
	 * Special mid-R17 for middle distance
	 */
	if (rssi >= -74) {
		low_bound += 0x08;
		if (r17 != low_bound)
			rt61pci_bbp_write(rt2x00dev, 17, low_bound);
		return;
	}

	/*
	 * Special case: Change up_bound based on the rssi.
	 * Lower up_bound when rssi is weaker then -74 dBm.
	 */
	up_bound -= 2 * (-74 - rssi);
	if (low_bound > up_bound)
		up_bound = low_bound;

	if (r17 > up_bound) {
		rt61pci_bbp_write(rt2x00dev, 17, up_bound);
		return;
	}

dynamic_cca_tune:

	/*
	 * r17 does not yet exceed upper limit, continue and base
	 * the r17 tuning on the false CCA count.
	 */
	if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
		if (++r17 > up_bound)
			r17 = up_bound;
		rt61pci_bbp_write(rt2x00dev, 17, r17);
	} else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
		if (--r17 < low_bound)
			r17 = low_bound;
		rt61pci_bbp_write(rt2x00dev, 17, r17);
	}
}

/*
 * Firmware functions
 */
static char *rt61pci_get_firmware_name(struct rt2x00_dev *rt2x00dev)
{
	char *fw_name;

	switch (rt2x00dev->chip.rt) {
	case RT2561:
		fw_name = FIRMWARE_RT2561;
		break;
	case RT2561s:
		fw_name = FIRMWARE_RT2561s;
		break;
	case RT2661:
		fw_name = FIRMWARE_RT2661;
		break;
	default:
		fw_name = NULL;
		break;
	}

	return fw_name;
}

static u16 rt61pci_get_firmware_crc(void *data, const size_t len)
{
	u16 crc;

	/*
	 * Use the crc itu-t algorithm.
	 * The last 2 bytes in the firmware array are the crc checksum itself,
	 * this means that we should never pass those 2 bytes to the crc
	 * algorithm.
	 */
	crc = crc_itu_t(0, data, len - 2);
	crc = crc_itu_t_byte(crc, 0);
	crc = crc_itu_t_byte(crc, 0);

	return crc;
}

static int rt61pci_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
				 const size_t len)
{
	int i;
	u32 reg;

	/*
	 * Wait for stable hardware.
	 */
	for (i = 0; i < 100; i++) {
		rt2x00pci_register_read(rt2x00dev, MAC_CSR0, &reg);
		if (reg)
			break;
		msleep(1);
	}

	if (!reg) {
		ERROR(rt2x00dev, "Unstable hardware.\n");
		return -EBUSY;
	}

	/*
	 * Prepare MCU and mailbox for firmware loading.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, MCU_CNTL_CSR_RESET, 1);
	rt2x00pci_register_write(rt2x00dev, MCU_CNTL_CSR, reg);
	rt2x00pci_register_write(rt2x00dev, M2H_CMD_DONE_CSR, 0xffffffff);
	rt2x00pci_register_write(rt2x00dev, H2M_MAILBOX_CSR, 0);
	rt2x00pci_register_write(rt2x00dev, HOST_CMD_CSR, 0);

	/*
	 * Write firmware to device.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, MCU_CNTL_CSR_RESET, 1);
	rt2x00_set_field32(&reg, MCU_CNTL_CSR_SELECT_BANK, 1);
	rt2x00pci_register_write(rt2x00dev, MCU_CNTL_CSR, reg);

	rt2x00pci_register_multiwrite(rt2x00dev, FIRMWARE_IMAGE_BASE,
				      data, len);

	rt2x00_set_field32(&reg, MCU_CNTL_CSR_SELECT_BANK, 0);
	rt2x00pci_register_write(rt2x00dev, MCU_CNTL_CSR, reg);

	rt2x00_set_field32(&reg, MCU_CNTL_CSR_RESET, 0);
	rt2x00pci_register_write(rt2x00dev, MCU_CNTL_CSR, reg);

	for (i = 0; i < 100; i++) {
		rt2x00pci_register_read(rt2x00dev, MCU_CNTL_CSR, &reg);
		if (rt2x00_get_field32(reg, MCU_CNTL_CSR_READY))
			break;
		msleep(1);
	}

	if (i == 100) {
		ERROR(rt2x00dev, "MCU Control register not ready.\n");
		return -EBUSY;
	}

	/*
	 * Reset MAC and BBP registers.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 1);
	rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 1);
	rt2x00pci_register_write(rt2x00dev, MAC_CSR1, reg);

	rt2x00pci_register_read(rt2x00dev, MAC_CSR1, &reg);
	rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 0);
	rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 0);
	rt2x00pci_register_write(rt2x00dev, MAC_CSR1, reg);

	rt2x00pci_register_read(rt2x00dev, MAC_CSR1, &reg);
	rt2x00_set_field32(&reg, MAC_CSR1_HOST_READY, 1);
	rt2x00pci_register_write(rt2x00dev, MAC_CSR1, reg);

	return 0;
}

/*
 * Initialization functions.
 */
static void rt61pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
				 struct queue_entry *entry)
{
	struct queue_entry_priv_pci_rx *priv_rx = entry->priv_data;
	u32 word;

	rt2x00_desc_read(priv_rx->desc, 5, &word);
	rt2x00_set_field32(&word, RXD_W5_BUFFER_PHYSICAL_ADDRESS,
			   priv_rx->data_dma);
	rt2x00_desc_write(priv_rx->desc, 5, word);

	rt2x00_desc_read(priv_rx->desc, 0, &word);
	rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
	rt2x00_desc_write(priv_rx->desc, 0, word);
}

static void rt61pci_init_txentry(struct rt2x00_dev *rt2x00dev,
				 struct queue_entry *entry)
{
	struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
	u32 word;

	rt2x00_desc_read(priv_tx->desc, 1, &word);
	rt2x00_set_field32(&word, TXD_W1_BUFFER_COUNT, 1);
	rt2x00_desc_write(priv_tx->desc, 1, word);

	rt2x00_desc_read(priv_tx->desc, 5, &word);