[linux-2.6-block.git] / drivers / net / wireless / p54 / p54spi.c

/*
 * Copyright (C) 2008 Christian Lamparter <chunkeey@web.de>
 * Copyright 2008       Johannes Berg <johannes@sipsolutions.net>
 *
 * This driver is a port from stlc45xx:
 *	Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 *
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/spi/spi.h>
#include <linux/etherdevice.h>
#include <linux/gpio.h>

#include "p54spi.h"
#include "p54spi_eeprom.h"
#include "p54.h"

#include "p54common.h"

MODULE_FIRMWARE("3826.arm");
MODULE_ALIAS("stlc45xx");

/*
 * gpios should be handled in board files and provided via platform data,
 * but because it's currently impossible for p54spi to have a header file
 * in include/linux, let's use module paramaters for now
 */

static int p54spi_gpio_power = 97;
module_param(p54spi_gpio_power, int, 0444);
MODULE_PARM_DESC(p54spi_gpio_power, "gpio number for power line");

static int p54spi_gpio_irq = 87;
module_param(p54spi_gpio_irq, int, 0444);
MODULE_PARM_DESC(p54spi_gpio_irq, "gpio number for irq line");

static void p54spi_spi_read(struct p54s_priv *priv, u8 address,
			      void *buf, size_t len)
{
	struct spi_transfer t[2];
	struct spi_message m;
	__le16 addr;

	/* We first push the address */
	addr = cpu_to_le16(address << 8 | SPI_ADRS_READ_BIT_15);

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &addr;
	t[0].len = sizeof(addr);
	spi_message_add_tail(&t[0], &m);

	t[1].rx_buf = buf;
	t[1].len = len;
	spi_message_add_tail(&t[1], &m);

	spi_sync(priv->spi, &m);
}


static void p54spi_spi_write(struct p54s_priv *priv, u8 address,
			     const void *buf, size_t len)
{
	struct spi_transfer t[3];
	struct spi_message m;
	__le16 addr;

	/* We first push the address */
	addr = cpu_to_le16(address << 8);

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &addr;
	t[0].len = sizeof(addr);
	spi_message_add_tail(&t[0], &m);

	t[1].tx_buf = buf;
	t[1].len = len;
	spi_message_add_tail(&t[1], &m);

	if (len % 2) {
		__le16 last_word;
		last_word = cpu_to_le16(((u8 *)buf)[len - 1]);

		t[2].tx_buf = &last_word;
		t[2].len = sizeof(last_word);
		spi_message_add_tail(&t[2], &m);
	}

	spi_sync(priv->spi, &m);
}

static u16 p54spi_read16(struct p54s_priv *priv, u8 addr)
{
	__le16 val;

	p54spi_spi_read(priv, addr, &val, sizeof(val));

	return le16_to_cpu(val);
}

static u32 p54spi_read32(struct p54s_priv *priv, u8 addr)
{
	__le32 val;

	p54spi_spi_read(priv, addr, &val, sizeof(val));

	return le32_to_cpu(val);
}

static inline void p54spi_write16(struct p54s_priv *priv, u8 addr, __le16 val)
{
	p54spi_spi_write(priv, addr, &val, sizeof(val));
}

static inline void p54spi_write32(struct p54s_priv *priv, u8 addr, __le32 val)
{
	p54spi_spi_write(priv, addr, &val, sizeof(val));
}

struct p54spi_spi_reg {
	u16 address;		/* __le16 ? */
	u16 length;
	char *name;
};

static const struct p54spi_spi_reg p54spi_registers_array[] =
{
	{ SPI_ADRS_ARM_INTERRUPTS,	32, "ARM_INT     " },
	{ SPI_ADRS_ARM_INT_EN,		32, "ARM_INT_ENA " },
	{ SPI_ADRS_HOST_INTERRUPTS,	32, "HOST_INT    " },
	{ SPI_ADRS_HOST_INT_EN,		32, "HOST_INT_ENA" },
	{ SPI_ADRS_HOST_INT_ACK,	32, "HOST_INT_ACK" },
	{ SPI_ADRS_GEN_PURP_1,		32, "GP1_COMM    " },
	{ SPI_ADRS_GEN_PURP_2,		32, "GP2_COMM    " },
	{ SPI_ADRS_DEV_CTRL_STAT,	32, "DEV_CTRL_STA" },
	{ SPI_ADRS_DMA_DATA,		16, "DMA_DATA    " },
	{ SPI_ADRS_DMA_WRITE_CTRL,	16, "DMA_WR_CTRL " },
	{ SPI_ADRS_DMA_WRITE_LEN,	16, "DMA_WR_LEN  " },
	{ SPI_ADRS_DMA_WRITE_BASE,	32, "DMA_WR_BASE " },
	{ SPI_ADRS_DMA_READ_CTRL,	16, "DMA_RD_CTRL " },
	{ SPI_ADRS_DMA_READ_LEN,	16, "DMA_RD_LEN  " },
	{ SPI_ADRS_DMA_WRITE_BASE,	32, "DMA_RD_BASE " }
};

static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits)
{
	int i;
	__le32 buffer;

	for (i = 0; i < 2000; i++) {
		p54spi_spi_read(priv, reg, &buffer, sizeof(buffer));
		if ((buffer & bits) == bits)
			return 1;

		msleep(1);
	}
	return 0;
}

static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
				const void *buf, size_t len)
{
	p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
		       cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));

	if (p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
			    cpu_to_le32(HOST_ALLOWED)) == 0) {
		dev_err(&priv->spi->dev, "spi_write_dma not allowed "
			"to DMA write.");
		return -EAGAIN;
	}

	p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
	p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
	p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
	return 0;
}

static int p54spi_request_firmware(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	int ret;

	/* FIXME: should driver use it's own struct device? */
	ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);

	if (ret < 0) {
		dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
		return ret;
	}

	ret = p54_parse_firmware(dev, priv->firmware);
	if (ret) {
		release_firmware(priv->firmware);
		return ret;
	}

	return 0;
}

static int p54spi_request_eeprom(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	const struct firmware *eeprom;
	int ret;

	/*
	 * allow users to customize their eeprom.
	 */

	ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
	if (ret < 0) {
		dev_info(&priv->spi->dev, "loading default eeprom...\n");
		ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
				       sizeof(p54spi_eeprom));
	} else {
		dev_info(&priv->spi->dev, "loading user eeprom...\n");
		ret = p54_parse_eeprom(dev, (void *) eeprom->data,
				       (int)eeprom->size);
		release_firmware(eeprom);
	}
	return ret;
}

static int p54spi_upload_firmware(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	unsigned long fw_len, _fw_len;
	unsigned int offset = 0;
	int err = 0;
	u8 *fw;

	fw_len = priv->firmware->size;
	fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
	if (!fw)
		return -ENOMEM;

	/* stop the device */
	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
		       SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
		       SPI_CTRL_STAT_START_HALTED));

	msleep(TARGET_BOOT_SLEEP);

	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
		       SPI_CTRL_STAT_HOST_OVERRIDE |
		       SPI_CTRL_STAT_START_HALTED));

	msleep(TARGET_BOOT_SLEEP);

	while (fw_len > 0) {
		_fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);

		err = p54spi_spi_write_dma(priv, cpu_to_le32(
					   ISL38XX_DEV_FIRMWARE_ADDR + offset),
					   (fw + offset), _fw_len);
		if (err < 0)
			goto out;

		fw_len -= _fw_len;
		offset += _fw_len;
	}

	BUG_ON(fw_len != 0);

	/* enable host interrupts */
	p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
		       cpu_to_le32(SPI_HOST_INTS_DEFAULT));

	/* boot the device */
	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
		       SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
		       SPI_CTRL_STAT_RAM_BOOT));

	msleep(TARGET_BOOT_SLEEP);

	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
		       SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_RAM_BOOT));
	msleep(TARGET_BOOT_SLEEP);

out:
	kfree(fw);
	return err;
}

static void p54spi_power_off(struct p54s_priv *priv)
{
	disable_irq(gpio_to_irq(p54spi_gpio_irq));
	gpio_set_value(p54spi_gpio_power, 0);
}

static void p54spi_power_on(struct p54s_priv *priv)
{
	gpio_set_value(p54spi_gpio_power, 1);
	enable_irq(gpio_to_irq(p54spi_gpio_irq));

	/*
	 * need to wait a while before device can be accessed, the lenght
	 * is just a guess
	 */
	msleep(10);
}

static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
{
	p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
}

static void p54spi_wakeup(struct p54s_priv *priv)
{
	unsigned long timeout;
	u32 ints;

	/* wake the chip */
	p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
		       cpu_to_le32(SPI_TARGET_INT_WAKEUP));

	/* And wait for the READY interrupt */
	timeout = jiffies + HZ;

	ints =  p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	while (!(ints & SPI_HOST_INT_READY)) {
		if (time_after(jiffies, timeout))
				goto out;
		ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	}

	p54spi_int_ack(priv, SPI_HOST_INT_READY);

out:
	return;
}

static inline void p54spi_sleep(struct p54s_priv *priv)
{
	p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
		       cpu_to_le32(SPI_TARGET_INT_SLEEP));
}

static void p54spi_int_ready(struct p54s_priv *priv)
{
	p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
		       SPI_HOST_INT_UPDATE | SPI_HOST_INT_SW_UPDATE));

	switch (priv->fw_state) {
	case FW_STATE_BOOTING:
		priv->fw_state = FW_STATE_READY;
		complete(&priv->fw_comp);
		break;
	case FW_STATE_RESETTING:
		priv->fw_state = FW_STATE_READY;
		/* TODO: reinitialize state */
		break;
	default:
		break;
	}
}

static int p54spi_rx(struct p54s_priv *priv)
{
	struct sk_buff *skb;
	u16 len;

	p54spi_wakeup(priv);

	/* dummy read to flush SPI DMA controller bug */
	p54spi_read16(priv, SPI_ADRS_GEN_PURP_1);

	len = p54spi_read16(priv, SPI_ADRS_DMA_DATA);

	if (len == 0) {
		dev_err(&priv->spi->dev, "rx request of zero bytes");
		return 0;
	}

	skb = dev_alloc_skb(len);
	if (!skb) {
		dev_err(&priv->spi->dev, "could not alloc skb");
		return 0;
	}

	p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, skb_put(skb, len), len);
	p54spi_sleep(priv);

	if (p54_rx(priv->hw, skb) == 0)
		dev_kfree_skb(skb);

	return 0;
}


static irqreturn_t p54spi_interrupt(int irq, void *config)
{
	struct spi_device *spi = config;
	struct p54s_priv *priv = dev_get_drvdata(&spi->dev);

	queue_work(priv->hw->workqueue, &priv->work);

	return IRQ_HANDLED;
}

static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
{
	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
	unsigned long timeout;
	int ret = 0;
	u32 ints;

	p54spi_wakeup(priv);

	ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
	if (ret < 0)
		goto out;

	timeout = jiffies + 2 * HZ;
	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	while (!(ints & SPI_HOST_INT_WR_READY)) {
		if (time_after(jiffies, timeout)) {
			dev_err(&priv->spi->dev, "WR_READY timeout\n");
			ret = -1;
			goto out;
		}
		ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	}

	p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
	p54spi_sleep(priv);

	if (FREE_AFTER_TX(skb))
		p54_free_skb(priv->hw, skb);
out:
	return ret;
}

static int p54spi_wq_tx(struct p54s_priv *priv)
{
	struct p54s_tx_info *entry;
	struct sk_buff *skb;
	struct ieee80211_tx_info *info;
	struct p54_tx_info *minfo;
	struct p54s_tx_info *dinfo;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&priv->tx_lock, flags);

	while (!list_empty(&priv->tx_pending)) {
		entry = list_entry(priv->tx_pending.next,
				   struct p54s_tx_info, tx_list);

		list_del_init(&entry->tx_list);

		spin_unlock_irqrestore(&priv->tx_lock, flags);

		dinfo = container_of((void *) entry, struct p54s_tx_info,
				     tx_list);
		minfo = container_of((void *) dinfo, struct p54_tx_info,
				     data);
		info = container_of((void *) minfo, struct ieee80211_tx_info,
				    rate_driver_data);
		skb = container_of((void *) info, struct sk_buff, cb);

		ret = p54spi_tx_frame(priv, skb);

		if (ret < 0) {
			p54_free_skb(priv->hw, skb);
			return ret;
		}

		spin_lock_irqsave(&priv->tx_lock, flags);
	}
	spin_unlock_irqrestore(&priv->tx_lock, flags);
	return ret;
}

static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54s_priv *priv = dev->priv;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
	struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
	unsigned long flags;

	BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));

	spin_lock_irqsave(&priv->tx_lock, flags);
	list_add_tail(&di->tx_list, &priv->tx_pending);
	spin_unlock_irqrestore(&priv->tx_lock, flags);

	queue_work(priv->hw->workqueue, &priv->work);
}

static void p54spi_work(struct work_struct *work)
{
	struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
	u32 ints;
	int ret;

	mutex_lock(&priv->mutex);

	if (priv->fw_state == FW_STATE_OFF &&
	    priv->fw_state == FW_STATE_RESET)
		goto out;

	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);

	if (ints & SPI_HOST_INT_READY) {
		p54spi_int_ready(priv);
		p54spi_int_ack(priv, SPI_HOST_INT_READY);
	}

	if (priv->fw_state != FW_STATE_READY)
		goto out;

	if (ints & SPI_HOST_INT_UPDATE) {
		p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
		ret = p54spi_rx(priv);
		if (ret < 0)
			goto out;
	}
	if (ints & SPI_HOST_INT_SW_UPDATE) {
		p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
		ret = p54spi_rx(priv);
		if (ret < 0)
			goto out;
	}

	ret = p54spi_wq_tx(priv);
	if (ret < 0)
		goto out;

	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);

out:
	mutex_unlock(&priv->mutex);
}

static int p54spi_op_start(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	unsigned long timeout;
	int ret = 0;

	if (mutex_lock_interruptible(&priv->mutex)) {
		ret = -EINTR;
		goto out;
	}

	priv->fw_state = FW_STATE_BOOTING;

	p54spi_power_on(priv);

	ret = p54spi_upload_firmware(dev);
	if (ret < 0) {
		p54spi_power_off(priv);
		goto out_unlock;
	}

	mutex_unlock(&priv->mutex);

	timeout = msecs_to_jiffies(2000);
	timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
							    timeout);
	if (!timeout) {
		dev_err(&priv->spi->dev, "firmware boot failed");
		p54spi_power_off(priv);
		ret = -1;
		goto out;
	}

	if (mutex_lock_interruptible(&priv->mutex)) {
		ret = -EINTR;
		p54spi_power_off(priv);
		goto out;
	}

	WARN_ON(priv->fw_state != FW_STATE_READY);

out_unlock:
	mutex_unlock(&priv->mutex);

out:
	return ret;
}

static void p54spi_op_stop(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	unsigned long flags;

	if (mutex_lock_interruptible(&priv->mutex)) {
		/* FIXME: how to handle this error? */
		return;
	}

	WARN_ON(priv->fw_state != FW_STATE_READY);

	cancel_work_sync(&priv->work);

	p54spi_power_off(priv);
	spin_lock_irqsave(&priv->tx_lock, flags);
	INIT_LIST_HEAD(&priv->tx_pending);
	spin_unlock_irqrestore(&priv->tx_lock, flags);

	priv->fw_state = FW_STATE_OFF;
	mutex_unlock(&priv->mutex);
}

static int __devinit p54spi_probe(struct spi_device *spi)
{
	struct p54s_priv *priv = NULL;
	struct ieee80211_hw *hw;
	int ret = -EINVAL;

	hw = p54_init_common(sizeof(*priv));
	if (!hw) {
		dev_err(&priv->spi->dev, "could not alloc ieee80211_hw");
		return -ENOMEM;
	}

	priv = hw->priv;
	priv->hw = hw;
	dev_set_drvdata(&spi->dev, priv);
	priv->spi = spi;

	spi->bits_per_word = 16;
	spi->max_speed_hz = 24000000;

	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(&priv->spi->dev, "spi_setup failed");
		goto err_free_common;
	}

	ret = gpio_request(p54spi_gpio_power, "p54spi power");
	if (ret < 0) {
		dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
		goto err_free_common;
	}

	ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
	if (ret < 0) {
		dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
		goto err_free_common;
	}

	gpio_direction_output(p54spi_gpio_power, 0);
	gpio_direction_input(p54spi_gpio_irq);

	ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
			  p54spi_interrupt, IRQF_DISABLED, "p54spi",
			  priv->spi);
	if (ret < 0) {
		dev_err(&priv->spi->dev, "request_irq() failed");
		goto err_free_common;
	}

	set_irq_type(gpio_to_irq(p54spi_gpio_irq),
		     IRQ_TYPE_EDGE_RISING);

	disable_irq(gpio_to_irq(p54spi_gpio_irq));

	INIT_WORK(&priv->work, p54spi_work);
	init_completion(&priv->fw_comp);
	INIT_LIST_HEAD(&priv->tx_pending);
	mutex_init(&priv->mutex);
	SET_IEEE80211_DEV(hw, &spi->dev);
	priv->common.open = p54spi_op_start;
	priv->common.stop = p54spi_op_stop;
	priv->common.tx = p54spi_op_tx;

	ret = p54spi_request_firmware(hw);
	if (ret < 0)
		goto err_free_common;

	ret = p54spi_request_eeprom(hw);
	if (ret)
		goto err_free_common;

	ret = p54_register_common(hw, &priv->spi->dev);
	if (ret)
		goto err_free_common;

	return 0;

err_free_common:
	p54_free_common(priv->hw);
	return ret;
}

static int __devexit p54spi_remove(struct spi_device *spi)
{
	struct p54s_priv *priv = dev_get_drvdata(&spi->dev);

	ieee80211_unregister_hw(priv->hw);

	free_irq(gpio_to_irq(p54spi_gpio_irq), spi);

	gpio_free(p54spi_gpio_power);
	gpio_free(p54spi_gpio_irq);
	release_firmware(priv->firmware);

	mutex_destroy(&priv->mutex);

	p54_free_common(priv->hw);
	ieee80211_free_hw(priv->hw);

	return 0;
}


static struct spi_driver p54spi_driver = {
	.driver = {
		/* use cx3110x name because board-n800.c uses that for the
		 * SPI port */
		.name		= "cx3110x",
		.bus		= &spi_bus_type,
		.owner		= THIS_MODULE,
	},

	.probe		= p54spi_probe,
	.remove		= __devexit_p(p54spi_remove),
};

static int __init p54spi_init(void)
{
	int ret;

	ret = spi_register_driver(&p54spi_driver);
	if (ret < 0) {
		printk(KERN_ERR "failed to register SPI driver: %d", ret);
		goto out;
	}

out:
	return ret;
}

static void __exit p54spi_exit(void)
{
	spi_unregister_driver(&p54spi_driver);
}

module_init(p54spi_init);
module_exit(p54spi_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");
Commit	Line	Data
cd8d3d32 CL	1	/*
	2	* Copyright (C) 2008 Christian Lamparter <chunkeey@web.de>
	3	* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
	4	*
	5	* This driver is a port from stlc45xx:
	6	* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
	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	#include <linux/module.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/firmware.h>
	27	#include <linux/delay.h>
	28	#include <linux/irq.h>
	29	#include <linux/spi/spi.h>
	30	#include <linux/etherdevice.h>
	31	#include <linux/gpio.h>
	32
	33	#include "p54spi.h"
	34	#include "p54spi_eeprom.h"
	35	#include "p54.h"
	36
	37	#include "p54common.h"
	38
	39	MODULE_FIRMWARE("3826.arm");
	40	MODULE_ALIAS("stlc45xx");
	41
a2116993 CL	42	/*
	43	* gpios should be handled in board files and provided via platform data,
	44	* but because it's currently impossible for p54spi to have a header file
	45	* in include/linux, let's use module paramaters for now
	46	*/
	47
	48	static int p54spi_gpio_power = 97;
	49	module_param(p54spi_gpio_power, int, 0444);
	50	MODULE_PARM_DESC(p54spi_gpio_power, "gpio number for power line");
	51
	52	static int p54spi_gpio_irq = 87;
	53	module_param(p54spi_gpio_irq, int, 0444);
	54	MODULE_PARM_DESC(p54spi_gpio_irq, "gpio number for irq line");
	55
cd8d3d32 CL	56	static void p54spi_spi_read(struct p54s_priv *priv, u8 address,
	57	void *buf, size_t len)
	58	{
	59	struct spi_transfer t[2];
	60	struct spi_message m;
	61	__le16 addr;
	62
	63	/* We first push the address */
	64	addr = cpu_to_le16(address << 8 \| SPI_ADRS_READ_BIT_15);
	65
	66	spi_message_init(&m);
	67	memset(t, 0, sizeof(t));
	68
	69	t[0].tx_buf = &addr;
	70	t[0].len = sizeof(addr);
	71	spi_message_add_tail(&t[0], &m);
	72
	73	t[1].rx_buf = buf;
	74	t[1].len = len;
	75	spi_message_add_tail(&t[1], &m);
	76
	77	spi_sync(priv->spi, &m);
	78	}
	79
	80
	81	static void p54spi_spi_write(struct p54s_priv *priv, u8 address,
	82	const void *buf, size_t len)
	83	{
	84	struct spi_transfer t[3];
	85	struct spi_message m;
	86	__le16 addr;
	87
	88	/* We first push the address */
	89	addr = cpu_to_le16(address << 8);
	90
	91	spi_message_init(&m);
	92	memset(t, 0, sizeof(t));
	93
	94	t[0].tx_buf = &addr;
	95	t[0].len = sizeof(addr);
	96	spi_message_add_tail(&t[0], &m);
	97
	98	t[1].tx_buf = buf;
	99	t[1].len = len;
	100	spi_message_add_tail(&t[1], &m);
	101
	102	if (len % 2) {
	103	__le16 last_word;
	104	last_word = cpu_to_le16(((u8 *)buf)[len - 1]);
	105
	106	t[2].tx_buf = &last_word;
	107	t[2].len = sizeof(last_word);
	108	spi_message_add_tail(&t[2], &m);
	109	}
	110
	111	spi_sync(priv->spi, &m);
	112	}
	113
	114	static u16 p54spi_read16(struct p54s_priv *priv, u8 addr)
	115	{
	116	__le16 val;
	117
	118	p54spi_spi_read(priv, addr, &val, sizeof(val));
	119
120	return le16_to_cpu(val);
121	}
122
123	static u32 p54spi_read32(struct p54s_priv *priv, u8 addr)
124	{
125	__le32 val;
126
127	p54spi_spi_read(priv, addr, &val, sizeof(val));
128
129	return le32_to_cpu(val);
130	}
131
132	static inline void p54spi_write16(struct p54s_priv *priv, u8 addr, __le16 val)
133	{
134	p54spi_spi_write(priv, addr, &val, sizeof(val));
135	}
136
137	static inline void p54spi_write32(struct p54s_priv *priv, u8 addr, __le32 val)
138	{
139	p54spi_spi_write(priv, addr, &val, sizeof(val));
140	}
141
142	struct p54spi_spi_reg {
143	u16 address; /* __le16 ? */
144	u16 length;
145	char *name;
146	};
147
148	static const struct p54spi_spi_reg p54spi_registers_array[] =
149	{
150	{ SPI_ADRS_ARM_INTERRUPTS, 32, "ARM_INT " },
151	{ SPI_ADRS_ARM_INT_EN, 32, "ARM_INT_ENA " },
152	{ SPI_ADRS_HOST_INTERRUPTS, 32, "HOST_INT " },
153	{ SPI_ADRS_HOST_INT_EN, 32, "HOST_INT_ENA" },
154	{ SPI_ADRS_HOST_INT_ACK, 32, "HOST_INT_ACK" },
155	{ SPI_ADRS_GEN_PURP_1, 32, "GP1_COMM " },
156	{ SPI_ADRS_GEN_PURP_2, 32, "GP2_COMM " },
157	{ SPI_ADRS_DEV_CTRL_STAT, 32, "DEV_CTRL_STA" },
158	{ SPI_ADRS_DMA_DATA, 16, "DMA_DATA " },
159	{ SPI_ADRS_DMA_WRITE_CTRL, 16, "DMA_WR_CTRL " },
160	{ SPI_ADRS_DMA_WRITE_LEN, 16, "DMA_WR_LEN " },
161	{ SPI_ADRS_DMA_WRITE_BASE, 32, "DMA_WR_BASE " },
162	{ SPI_ADRS_DMA_READ_CTRL, 16, "DMA_RD_CTRL " },
163	{ SPI_ADRS_DMA_READ_LEN, 16, "DMA_RD_LEN " },
164	{ SPI_ADRS_DMA_WRITE_BASE, 32, "DMA_RD_BASE " }
165	};
166
167	static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits)
168	{
169	int i;
170	__le32 buffer;
171
172	for (i = 0; i < 2000; i++) {
173	p54spi_spi_read(priv, reg, &buffer, sizeof(buffer));
f74d0f5c	174	if ((buffer & bits) == bits)
cd8d3d32 CL	175	return 1;
	176
	177	msleep(1);
	178	}
	179	return 0;
	180	}
	181
4f5cab96 MF	182	static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
	183	const void *buf, size_t len)
	184	{
	185	p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
	186	cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
	187
	188	if (p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
	189	cpu_to_le32(HOST_ALLOWED)) == 0) {
	190	dev_err(&priv->spi->dev, "spi_write_dma not allowed "
	191	"to DMA write.");
	192	return -EAGAIN;
	193	}
	194
	195	p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
	196	p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
	197	p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
	198	return 0;
	199	}
	200
cd8d3d32 CL	201	static int p54spi_request_firmware(struct ieee80211_hw *dev)
	202	{
	203	struct p54s_priv *priv = dev->priv;
	204	int ret;
	205
	206	/* FIXME: should driver use it's own struct device? */
	207	ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
	208
	209	if (ret < 0) {
	210	dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
	211	return ret;
	212	}
	213
	214	ret = p54_parse_firmware(dev, priv->firmware);
	215	if (ret) {
	216	release_firmware(priv->firmware);
	217	return ret;
	218	}
	219
	220	return 0;
	221	}
	222
	223	static int p54spi_request_eeprom(struct ieee80211_hw *dev)
	224	{
	225	struct p54s_priv *priv = dev->priv;
	226	const struct firmware *eeprom;
	227	int ret;
	228
	229	/*
	230	* allow users to customize their eeprom.
	231	*/
	232
	233	ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
	234	if (ret < 0) {
	235	dev_info(&priv->spi->dev, "loading default eeprom...\n");
	236	ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
	237	sizeof(p54spi_eeprom));
	238	} else {
	239	dev_info(&priv->spi->dev, "loading user eeprom...\n");
	240	ret = p54_parse_eeprom(dev, (void *) eeprom->data,
	241	(int)eeprom->size);
	242	release_firmware(eeprom);
	243	}
	244	return ret;
	245	}
	246
	247	static int p54spi_upload_firmware(struct ieee80211_hw *dev)
	248	{
	249	struct p54s_priv *priv = dev->priv;
5e3af1d2 MF	250	unsigned long fw_len, _fw_len;
	251	unsigned int offset = 0;
	252	int err = 0;
	253	u8 *fw;
	254
	255	fw_len = priv->firmware->size;
	256	fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
	257	if (!fw)
	258	return -ENOMEM;
cd8d3d32 CL	259
	260	/* stop the device */
	261	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
	262	SPI_CTRL_STAT_HOST_OVERRIDE \| SPI_CTRL_STAT_HOST_RESET \|
	263	SPI_CTRL_STAT_START_HALTED));
	264
	265	msleep(TARGET_BOOT_SLEEP);
	266
	267	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
	268	SPI_CTRL_STAT_HOST_OVERRIDE \|
	269	SPI_CTRL_STAT_START_HALTED));
	270
	271	msleep(TARGET_BOOT_SLEEP);
	272
cd8d3d32 CL	273	while (fw_len > 0) {
	274	_fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
	275
4f5cab96 MF	276	err = p54spi_spi_write_dma(priv, cpu_to_le32(
	277	ISL38XX_DEV_FIRMWARE_ADDR + offset),
	278	(fw + offset), _fw_len);
	279	if (err < 0)
5e3af1d2	280	goto out;
cd8d3d32 CL	281
cd8d3d32 CL	282	fw_len -= _fw_len;
5e3af1d2	283	offset += _fw_len;
cd8d3d32 CL	284	}
	285
	286	BUG_ON(fw_len != 0);
	287
	288	/* enable host interrupts */
	289	p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
	290	cpu_to_le32(SPI_HOST_INTS_DEFAULT));
	291
	292	/* boot the device */
	293	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
	294	SPI_CTRL_STAT_HOST_OVERRIDE \| SPI_CTRL_STAT_HOST_RESET \|
	295	SPI_CTRL_STAT_RAM_BOOT));
	296
	297	msleep(TARGET_BOOT_SLEEP);
	298
	299	p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
	300	SPI_CTRL_STAT_HOST_OVERRIDE \| SPI_CTRL_STAT_RAM_BOOT));
	301	msleep(TARGET_BOOT_SLEEP);
5e3af1d2 MF	302
	303	out:
	304	kfree(fw);
	305	return err;
cd8d3d32 CL	306	}
	307
	308	static void p54spi_power_off(struct p54s_priv *priv)
	309	{
a2116993 CL	310	disable_irq(gpio_to_irq(p54spi_gpio_irq));
a2116993 CL	311	gpio_set_value(p54spi_gpio_power, 0);
cd8d3d32 CL	312	}
	313
	314	static void p54spi_power_on(struct p54s_priv *priv)
	315	{
a2116993 CL	316	gpio_set_value(p54spi_gpio_power, 1);
a2116993 CL	317	enable_irq(gpio_to_irq(p54spi_gpio_irq));
cd8d3d32 CL	318
	319	/*
	320	* need to wait a while before device can be accessed, the lenght
	321	* is just a guess
	322	*/
	323	msleep(10);
	324	}
	325
	326	static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
	327	{
	328	p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
	329	}
	330
	331	static void p54spi_wakeup(struct p54s_priv *priv)
	332	{
	333	unsigned long timeout;
	334	u32 ints;
	335
	336	/* wake the chip */
	337	p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
	338	cpu_to_le32(SPI_TARGET_INT_WAKEUP));
	339
	340	/* And wait for the READY interrupt */
	341	timeout = jiffies + HZ;
	342
	343	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	344	while (!(ints & SPI_HOST_INT_READY)) {
	345	if (time_after(jiffies, timeout))
	346	goto out;
	347	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	348	}
	349
	350	p54spi_int_ack(priv, SPI_HOST_INT_READY);
	351
	352	out:
	353	return;
	354	}
	355
	356	static inline void p54spi_sleep(struct p54s_priv *priv)
	357	{
	358	p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
	359	cpu_to_le32(SPI_TARGET_INT_SLEEP));
	360	}
	361
	362	static void p54spi_int_ready(struct p54s_priv *priv)
	363	{
	364	p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
	365	SPI_HOST_INT_UPDATE \| SPI_HOST_INT_SW_UPDATE));
	366
	367	switch (priv->fw_state) {
	368	case FW_STATE_BOOTING:
	369	priv->fw_state = FW_STATE_READY;
	370	complete(&priv->fw_comp);
	371	break;
	372	case FW_STATE_RESETTING:
	373	priv->fw_state = FW_STATE_READY;
	374	/* TODO: reinitialize state */
	375	break;
	376	default:
	377	break;
	378	}
	379	}
	380
	381	static int p54spi_rx(struct p54s_priv *priv)
382	{
383	struct sk_buff *skb;
384	u16 len;
385
386	p54spi_wakeup(priv);
387
388	/* dummy read to flush SPI DMA controller bug */
389	p54spi_read16(priv, SPI_ADRS_GEN_PURP_1);
390
391	len = p54spi_read16(priv, SPI_ADRS_DMA_DATA);
392
393	if (len == 0) {
394	dev_err(&priv->spi->dev, "rx request of zero bytes");
395	return 0;
396	}
397
398	skb = dev_alloc_skb(len);
399	if (!skb) {
400	dev_err(&priv->spi->dev, "could not alloc skb");
401	return 0;
402	}
403
404	p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, skb_put(skb, len), len);
405	p54spi_sleep(priv);
406
407	if (p54_rx(priv->hw, skb) == 0)
408	dev_kfree_skb(skb);
409
410	return 0;
411	}
412
413
414	static irqreturn_t p54spi_interrupt(int irq, void *config)
415	{
416	struct spi_device *spi = config;
417	struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
418
419	queue_work(priv->hw->workqueue, &priv->work);
420
421	return IRQ_HANDLED;
422	}
423
424	static int p54spi_tx_frame(struct p54s_priv priv, struct sk_buff skb)
425	{
426	struct p54_hdr hdr = (struct p54_hdr ) skb->data;
cd8d3d32 CL	427	unsigned long timeout;
	428	int ret = 0;
	429	u32 ints;
	430
	431	p54spi_wakeup(priv);
	432
4f5cab96 MF	433	ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
	434	if (ret < 0)
	435	goto out;
cd8d3d32 CL	436
	437	timeout = jiffies + 2 * HZ;
	438	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	439	while (!(ints & SPI_HOST_INT_WR_READY)) {
	440	if (time_after(jiffies, timeout)) {
4f5cab96	441	dev_err(&priv->spi->dev, "WR_READY timeout\n");
cd8d3d32 CL	442	ret = -1;
	443	goto out;
	444	}
	445	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	446	}
	447
	448	p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
	449	p54spi_sleep(priv);
	450
cd8d3d32 CL	451	if (FREE_AFTER_TX(skb))
cd8d3d32 CL	452	p54_free_skb(priv->hw, skb);
4f5cab96	453	out:
cd8d3d32 CL	454	return ret;
	455	}
	456
	457	static int p54spi_wq_tx(struct p54s_priv *priv)
	458	{
	459	struct p54s_tx_info *entry;
	460	struct sk_buff *skb;
	461	struct ieee80211_tx_info *info;
	462	struct p54_tx_info *minfo;
	463	struct p54s_tx_info *dinfo;
731c6531	464	unsigned long flags;
cd8d3d32 CL	465	int ret = 0;
cd8d3d32 CL	466
731c6531	467	spin_lock_irqsave(&priv->tx_lock, flags);
cd8d3d32 CL	468
	469	while (!list_empty(&priv->tx_pending)) {
	470	entry = list_entry(priv->tx_pending.next,
	471	struct p54s_tx_info, tx_list);
	472
	473	list_del_init(&entry->tx_list);
	474
731c6531	475	spin_unlock_irqrestore(&priv->tx_lock, flags);
cd8d3d32 CL	476
	477	dinfo = container_of((void *) entry, struct p54s_tx_info,
	478	tx_list);
	479	minfo = container_of((void *) dinfo, struct p54_tx_info,
	480	data);
	481	info = container_of((void *) minfo, struct ieee80211_tx_info,
	482	rate_driver_data);
	483	skb = container_of((void *) info, struct sk_buff, cb);
	484
	485	ret = p54spi_tx_frame(priv, skb);
	486
cd8d3d32 CL	487	if (ret < 0) {
cd8d3d32 CL	488	p54_free_skb(priv->hw, skb);
731c6531	489	return ret;
cd8d3d32	490	}
cd8d3d32	491
731c6531 CL	492	spin_lock_irqsave(&priv->tx_lock, flags);
	493	}
	494	spin_unlock_irqrestore(&priv->tx_lock, flags);
cd8d3d32 CL	495	return ret;
	496	}
	497
	498	static void p54spi_op_tx(struct ieee80211_hw dev, struct sk_buff skb)
	499	{
	500	struct p54s_priv *priv = dev->priv;
	501	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	502	struct p54_tx_info mi = (struct p54_tx_info ) info->rate_driver_data;
	503	struct p54s_tx_info di = (struct p54s_tx_info ) mi->data;
731c6531	504	unsigned long flags;
cd8d3d32 CL	505
	506	BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
	507
731c6531	508	spin_lock_irqsave(&priv->tx_lock, flags);
cd8d3d32	509	list_add_tail(&di->tx_list, &priv->tx_pending);
731c6531	510	spin_unlock_irqrestore(&priv->tx_lock, flags);
cd8d3d32 CL	511
	512	queue_work(priv->hw->workqueue, &priv->work);
	513	}
	514
	515	static void p54spi_work(struct work_struct *work)
	516	{
	517	struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
	518	u32 ints;
	519	int ret;
	520
	521	mutex_lock(&priv->mutex);
	522
	523	if (priv->fw_state == FW_STATE_OFF &&
	524	priv->fw_state == FW_STATE_RESET)
	525	goto out;
	526
	527	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	528
	529	if (ints & SPI_HOST_INT_READY) {
	530	p54spi_int_ready(priv);
	531	p54spi_int_ack(priv, SPI_HOST_INT_READY);
	532	}
	533
	534	if (priv->fw_state != FW_STATE_READY)
	535	goto out;
	536
	537	if (ints & SPI_HOST_INT_UPDATE) {
	538	p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
	539	ret = p54spi_rx(priv);
	540	if (ret < 0)
	541	goto out;
	542	}
	543	if (ints & SPI_HOST_INT_SW_UPDATE) {
	544	p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
	545	ret = p54spi_rx(priv);
	546	if (ret < 0)
	547	goto out;
	548	}
	549
	550	ret = p54spi_wq_tx(priv);
	551	if (ret < 0)
	552	goto out;
	553
	554	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
	555
	556	out:
	557	mutex_unlock(&priv->mutex);
	558	}
	559
	560	static int p54spi_op_start(struct ieee80211_hw *dev)
	561	{
	562	struct p54s_priv *priv = dev->priv;
	563	unsigned long timeout;
	564	int ret = 0;
	565
	566	if (mutex_lock_interruptible(&priv->mutex)) {
	567	ret = -EINTR;
	568	goto out;
	569	}
	570
	571	priv->fw_state = FW_STATE_BOOTING;
	572
	573	p54spi_power_on(priv);
	574
575	ret = p54spi_upload_firmware(dev);
576	if (ret < 0) {
577	p54spi_power_off(priv);
578	goto out_unlock;
579	}
580
581	mutex_unlock(&priv->mutex);
582
583	timeout = msecs_to_jiffies(2000);
584	timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
585	timeout);
586	if (!timeout) {
587	dev_err(&priv->spi->dev, "firmware boot failed");
588	p54spi_power_off(priv);
589	ret = -1;
590	goto out;
591	}
592
593	if (mutex_lock_interruptible(&priv->mutex)) {
594	ret = -EINTR;
595	p54spi_power_off(priv);
596	goto out;
597	}
598
599	WARN_ON(priv->fw_state != FW_STATE_READY);
600
601	out_unlock:
602	mutex_unlock(&priv->mutex);
603
604	out:
605	return ret;
606	}
607
608	static void p54spi_op_stop(struct ieee80211_hw *dev)
609	{
610	struct p54s_priv *priv = dev->priv;
731c6531	611	unsigned long flags;
cd8d3d32 CL	612
	613	if (mutex_lock_interruptible(&priv->mutex)) {
	614	/* FIXME: how to handle this error? */
	615	return;
	616	}
	617
	618	WARN_ON(priv->fw_state != FW_STATE_READY);
	619
	620	cancel_work_sync(&priv->work);
	621
	622	p54spi_power_off(priv);
731c6531	623	spin_lock_irqsave(&priv->tx_lock, flags);
cd8d3d32	624	INIT_LIST_HEAD(&priv->tx_pending);
731c6531	625	spin_unlock_irqrestore(&priv->tx_lock, flags);
cd8d3d32 CL	626
	627	priv->fw_state = FW_STATE_OFF;
	628	mutex_unlock(&priv->mutex);
	629	}
	630
	631	static int __devinit p54spi_probe(struct spi_device *spi)
	632	{
	633	struct p54s_priv *priv = NULL;
	634	struct ieee80211_hw *hw;
	635	int ret = -EINVAL;
	636
	637	hw = p54_init_common(sizeof(*priv));
	638	if (!hw) {
	639	dev_err(&priv->spi->dev, "could not alloc ieee80211_hw");
	640	return -ENOMEM;
	641	}
	642
	643	priv = hw->priv;
	644	priv->hw = hw;
	645	dev_set_drvdata(&spi->dev, priv);
	646	priv->spi = spi;
	647
cd8d3d32 CL	648	spi->bits_per_word = 16;
	649	spi->max_speed_hz = 24000000;
	650
	651	ret = spi_setup(spi);
	652	if (ret < 0) {
	653	dev_err(&priv->spi->dev, "spi_setup failed");
	654	goto err_free_common;
	655	}
	656
a2116993	657	ret = gpio_request(p54spi_gpio_power, "p54spi power");
cd8d3d32 CL	658	if (ret < 0) {
	659	dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
	660	goto err_free_common;
	661	}
	662
a2116993	663	ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
cd8d3d32 CL	664	if (ret < 0) {
	665	dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
	666	goto err_free_common;
	667	}
	668
a2116993 CL	669	gpio_direction_output(p54spi_gpio_power, 0);
a2116993 CL	670	gpio_direction_input(p54spi_gpio_irq);
cd8d3d32	671
a2116993	672	ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
cd8d3d32 CL	673	p54spi_interrupt, IRQF_DISABLED, "p54spi",
	674	priv->spi);
	675	if (ret < 0) {
	676	dev_err(&priv->spi->dev, "request_irq() failed");
	677	goto err_free_common;
	678	}
	679
a2116993	680	set_irq_type(gpio_to_irq(p54spi_gpio_irq),
cd8d3d32 CL	681	IRQ_TYPE_EDGE_RISING);
cd8d3d32 CL	682
a2116993	683	disable_irq(gpio_to_irq(p54spi_gpio_irq));
cd8d3d32 CL	684
	685	INIT_WORK(&priv->work, p54spi_work);
	686	init_completion(&priv->fw_comp);
	687	INIT_LIST_HEAD(&priv->tx_pending);
	688	mutex_init(&priv->mutex);
	689	SET_IEEE80211_DEV(hw, &spi->dev);
	690	priv->common.open = p54spi_op_start;
	691	priv->common.stop = p54spi_op_stop;
	692	priv->common.tx = p54spi_op_tx;
	693
	694	ret = p54spi_request_firmware(hw);
	695	if (ret < 0)
	696	goto err_free_common;
	697
	698	ret = p54spi_request_eeprom(hw);
	699	if (ret)
	700	goto err_free_common;
	701
2ac71072 CL	702	ret = p54_register_common(hw, &priv->spi->dev);
2ac71072 CL	703	if (ret)
cd8d3d32	704	goto err_free_common;
cd8d3d32	705
cd8d3d32 CL	706	return 0;
	707
	708	err_free_common:
	709	p54_free_common(priv->hw);
	710	return ret;
	711	}
	712
	713	static int __devexit p54spi_remove(struct spi_device *spi)
	714	{
	715	struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
	716
	717	ieee80211_unregister_hw(priv->hw);
	718
a2116993	719	free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
cd8d3d32	720
a2116993 CL	721	gpio_free(p54spi_gpio_power);
a2116993 CL	722	gpio_free(p54spi_gpio_irq);
cd8d3d32 CL	723	release_firmware(priv->firmware);
	724
	725	mutex_destroy(&priv->mutex);
	726
	727	p54_free_common(priv->hw);
	728	ieee80211_free_hw(priv->hw);
	729
	730	return 0;
	731	}
	732
	733
	734	static struct spi_driver p54spi_driver = {
	735	.driver = {
	736	/* use cx3110x name because board-n800.c uses that for the
	737	* SPI port */
	738	.name = "cx3110x",
	739	.bus = &spi_bus_type,
	740	.owner = THIS_MODULE,
	741	},
	742
	743	.probe = p54spi_probe,
	744	.remove = __devexit_p(p54spi_remove),
	745	};
	746
	747	static int __init p54spi_init(void)
	748	{
	749	int ret;
	750
	751	ret = spi_register_driver(&p54spi_driver);
	752	if (ret < 0) {
	753	printk(KERN_ERR "failed to register SPI driver: %d", ret);
	754	goto out;
	755	}
	756
	757	out:
	758	return ret;
	759	}
	760
	761	static void __exit p54spi_exit(void)
	762	{
	763	spi_unregister_driver(&p54spi_driver);
	764	}
	765
	766	module_init(p54spi_init);
	767	module_exit(p54spi_exit);
	768
	769	MODULE_LICENSE("GPL");
	770	MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");