[linux-block.git] / drivers / net / wireless / libertas / if_cs.c

/*

  Driver for the Marvell 8385 based compact flash WLAN cards.

  (C) 2007 by Holger Schurig <hs4233@mail.mn-solutions.de>

  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 <linux/module.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>

#include <linux/io.h>

#define DRV_NAME "libertas_cs"

#include "decl.h"
#include "defs.h"
#include "dev.h"


/********************************************************************/
/* Module stuff                                                     */
/********************************************************************/

MODULE_AUTHOR("Holger Schurig <hs4233@mail.mn-solutions.de>");
MODULE_DESCRIPTION("Driver for Marvell 83xx compact flash WLAN cards");
MODULE_LICENSE("GPL");


/********************************************************************/
/* Data structures                                                  */
/********************************************************************/

struct if_cs_card {
	struct pcmcia_device *p_dev;
	struct lbs_private *priv;
	void __iomem *iobase;
};


/********************************************************************/
/* Hardware access                                                  */
/********************************************************************/

/* This define enables wrapper functions which allow you
   to dump all register accesses. You normally won't this,
   except for development */
/* #define DEBUG_IO */

#ifdef DEBUG_IO
static int debug_output = 0;
#else
/* This way the compiler optimizes the printk's away */
#define debug_output 0
#endif

static inline unsigned int if_cs_read8(struct if_cs_card *card, uint reg)
{
	unsigned int val = ioread8(card->iobase + reg);
	if (debug_output)
		printk(KERN_INFO "inb %08x<%02x\n", reg, val);
	return val;
}
static inline unsigned int if_cs_read16(struct if_cs_card *card, uint reg)
{
	unsigned int val = ioread16(card->iobase + reg);
	if (debug_output)
		printk(KERN_INFO "inw %08x<%04x\n", reg, val);
	return val;
}
static inline void if_cs_read16_rep(
	struct if_cs_card *card,
	uint reg,
	void *buf,
	unsigned long count)
{
	if (debug_output)
		printk(KERN_INFO "insw %08x<(0x%lx words)\n",
			reg, count);
	ioread16_rep(card->iobase + reg, buf, count);
}

static inline void if_cs_write8(struct if_cs_card *card, uint reg, u8 val)
{
	if (debug_output)
		printk(KERN_INFO "outb %08x>%02x\n", reg, val);
	iowrite8(val, card->iobase + reg);
}

static inline void if_cs_write16(struct if_cs_card *card, uint reg, u16 val)
{
	if (debug_output)
		printk(KERN_INFO "outw %08x>%04x\n", reg, val);
	iowrite16(val, card->iobase + reg);
}

static inline void if_cs_write16_rep(
	struct if_cs_card *card,
	uint reg,
	const void *buf,
	unsigned long count)
{
	if (debug_output)
		printk(KERN_INFO "outsw %08x>(0x%lx words)\n",
			reg, count);
	iowrite16_rep(card->iobase + reg, buf, count);
}


/*
 * I know that polling/delaying is frowned upon. However, this procedure
 * with polling is needed while downloading the firmware. At this stage,
 * the hardware does unfortunately not create any interrupts.
 *
 * Fortunately, this function is never used once the firmware is in
 * the card. :-)
 *
 * As a reference, see the "Firmware Specification v5.1", page 18
 * and 19. I did not follow their suggested timing to the word,
 * but this works nice & fast anyway.
 */
static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 reg)
{
	int i;

	for (i = 0; i < 100000; i++) {
		u8 val = if_cs_read8(card, addr);
		if (val == reg)
			return 0;
		udelay(5);
	}
	return -ETIME;
}


/*
 * First the bitmasks for the host/card interrupt/status registers:
 */
#define IF_CS_BIT_TX			0x0001
#define IF_CS_BIT_RX			0x0002
#define IF_CS_BIT_COMMAND		0x0004
#define IF_CS_BIT_RESP			0x0008
#define IF_CS_BIT_EVENT			0x0010
#define	IF_CS_BIT_MASK			0x001f


/*
 * It's not really clear to me what the host status register is for. It
 * needs to be set almost in union with "host int cause". The following
 * bits from above are used:
 *
 *   IF_CS_BIT_TX         driver downloaded a data packet
 *   IF_CS_BIT_RX         driver got a data packet
 *   IF_CS_BIT_COMMAND    driver downloaded a command
 *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 *   IF_CS_BIT_EVENT      driver read a host event
 */
#define IF_CS_HOST_STATUS		0x00000000

/*
 * With the host int cause register can the host (that is, Linux) cause
 * an interrupt in the firmware, to tell the firmware about those events:
 *
 *   IF_CS_BIT_TX         a data packet has been downloaded
 *   IF_CS_BIT_RX         a received data packet has retrieved
 *   IF_CS_BIT_COMMAND    a firmware block or a command has been downloaded
 *   IF_CS_BIT_RESP       not used (has some meaning with powerdown)
 *   IF_CS_BIT_EVENT      a host event (link lost etc) has been retrieved
 */
#define IF_CS_HOST_INT_CAUSE		0x00000002

/*
 * The host int mask register is used to enable/disable interrupt.  However,
 * I have the suspicion that disabled interrupts are lost.
 */
#define IF_CS_HOST_INT_MASK		0x00000004

/*
 * Used to send or receive data packets:
 */
#define IF_CS_WRITE			0x00000016
#define IF_CS_WRITE_LEN			0x00000014
#define IF_CS_READ			0x00000010
#define IF_CS_READ_LEN			0x00000024

/*
 * Used to send commands (and to send firmware block) and to
 * receive command responses:
 */
#define IF_CS_CMD			0x0000001A
#define IF_CS_CMD_LEN			0x00000018
#define IF_CS_RESP			0x00000012
#define IF_CS_RESP_LEN			0x00000030

/*
 * The card status registers shows what the card/firmware actually
 * accepts:
 *
 *   IF_CS_BIT_TX        you may send a data packet
 *   IF_CS_BIT_RX        you may retrieve a data packet
 *   IF_CS_BIT_COMMAND   you may send a command
 *   IF_CS_BIT_RESP      you may retrieve a command response
 *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 *
 * When reading this register several times, you will get back the same
 * results --- with one exception: the IF_CS_BIT_EVENT clear itself
 * automatically.
 *
 * Not that we don't rely on BIT_RX,_BIT_RESP or BIT_EVENT because
 * we handle this via the card int cause register.
 */
#define IF_CS_CARD_STATUS		0x00000020
#define IF_CS_CARD_STATUS_MASK		0x7f00

/*
 * The card int cause register is used by the card/firmware to notify us
 * about the following events:
 *
 *   IF_CS_BIT_TX        a data packet has successfully been sentx
 *   IF_CS_BIT_RX        a data packet has been received and can be retrieved
 *   IF_CS_BIT_COMMAND   not used
 *   IF_CS_BIT_RESP      the firmware has a command response for us
 *   IF_CS_BIT_EVENT     the card has a event for use (link lost, snr low etc)
 */
#define IF_CS_CARD_INT_CAUSE		0x00000022

/*
 * This is used to for handshaking with the card's bootloader/helper image
 * to synchronize downloading of firmware blocks.
 */
#define IF_CS_SQ_READ_LOW		0x00000028
#define IF_CS_SQ_HELPER_OK		0x10

/*
 * The scratch register tells us ...
 *
 * IF_CS_SCRATCH_BOOT_OK     the bootloader runs
 * IF_CS_SCRATCH_HELPER_OK   the helper firmware already runs
 */
#define IF_CS_SCRATCH			0x0000003F
#define IF_CS_SCRATCH_BOOT_OK		0x00
#define IF_CS_SCRATCH_HELPER_OK		0x5a

/*
 * Used to detect ancient chips:
 */
#define IF_CS_PRODUCT_ID		0x0000001C
#define IF_CS_CF8385_B1_REV		0x12
#define IF_CS_CF8381_B3_REV		0x04

/*
 * Used to detect other cards than CF8385 since their revisions of silicon
 * doesn't match those from CF8385, eg. CF8381 B3 works with this driver.
 */
#define CF8381_MANFID		0x02db
#define CF8381_CARDID		0x6064
#define CF8385_MANFID		0x02df
#define CF8385_CARDID		0x8103

static inline int if_cs_hw_is_cf8381(struct pcmcia_device *p_dev)
{
	return (p_dev->manf_id == CF8381_MANFID &&
		p_dev->card_id == CF8381_CARDID);
}

static inline int if_cs_hw_is_cf8385(struct pcmcia_device *p_dev)
{
	return (p_dev->manf_id == CF8385_MANFID &&
		p_dev->card_id == CF8385_CARDID);
}

/********************************************************************/
/* I/O and interrupt handling                                       */
/********************************************************************/

static inline void if_cs_enable_ints(struct if_cs_card *card)
{
	lbs_deb_enter(LBS_DEB_CS);
	if_cs_write16(card, IF_CS_HOST_INT_MASK, 0);
}

static inline void if_cs_disable_ints(struct if_cs_card *card)
{
	lbs_deb_enter(LBS_DEB_CS);
	if_cs_write16(card, IF_CS_HOST_INT_MASK, IF_CS_BIT_MASK);
}

/*
 * Called from if_cs_host_to_card to send a command to the hardware
 */
static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb)
{
	struct if_cs_card *card = (struct if_cs_card *)priv->card;
	int ret = -1;
	int loops = 0;

	lbs_deb_enter(LBS_DEB_CS);
	if_cs_disable_ints(card);

	/* Is hardware ready? */
	while (1) {
		u16 status = if_cs_read16(card, IF_CS_CARD_STATUS);
		if (status & IF_CS_BIT_COMMAND)
			break;
		if (++loops > 100) {
			lbs_pr_err("card not ready for commands\n");
			goto done;
		}
		mdelay(1);
	}

	if_cs_write16(card, IF_CS_CMD_LEN, nb);

	if_cs_write16_rep(card, IF_CS_CMD, buf, nb / 2);
	/* Are we supposed to transfer an odd amount of bytes? */
	if (nb & 1)
		if_cs_write8(card, IF_CS_CMD, buf[nb-1]);

	/* "Assert the download over interrupt command in the Host
	 * status register" */
	if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);

	/* "Assert the download over interrupt command in the Card
	 * interrupt case register" */
	if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
	ret = 0;

done:
	if_cs_enable_ints(card);
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}

/*
 * Called from if_cs_host_to_card to send a data to the hardware
 */
static void if_cs_send_data(struct lbs_private *priv, u8 *buf, u16 nb)
{
	struct if_cs_card *card = (struct if_cs_card *)priv->card;
	u16 status;

	lbs_deb_enter(LBS_DEB_CS);
	if_cs_disable_ints(card);

	status = if_cs_read16(card, IF_CS_CARD_STATUS);
	BUG_ON((status & IF_CS_BIT_TX) == 0);

	if_cs_write16(card, IF_CS_WRITE_LEN, nb);

	/* write even number of bytes, then odd byte if necessary */
	if_cs_write16_rep(card, IF_CS_WRITE, buf, nb / 2);
	if (nb & 1)
		if_cs_write8(card, IF_CS_WRITE, buf[nb-1]);

	if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_TX);
	if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_TX);
	if_cs_enable_ints(card);

	lbs_deb_leave(LBS_DEB_CS);
}

/*
 * Get the command result out of the card.
 */
static int if_cs_receive_cmdres(struct lbs_private *priv, u8 *data, u32 *len)
{
	unsigned long flags;
	int ret = -1;
	u16 status;

	lbs_deb_enter(LBS_DEB_CS);

	/* is hardware ready? */
	status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
	if ((status & IF_CS_BIT_RESP) == 0) {
		lbs_pr_err("no cmd response in card\n");
		*len = 0;
		goto out;
	}

	*len = if_cs_read16(priv->card, IF_CS_RESP_LEN);
	if ((*len == 0) || (*len > LBS_CMD_BUFFER_SIZE)) {
		lbs_pr_err("card cmd buffer has invalid # of bytes (%d)\n", *len);
		goto out;
	}

	/* read even number of bytes, then odd byte if necessary */
	if_cs_read16_rep(priv->card, IF_CS_RESP, data, *len/sizeof(u16));
	if (*len & 1)
		data[*len-1] = if_cs_read8(priv->card, IF_CS_RESP);

	/* This is a workaround for a firmware that reports too much
	 * bytes */
	*len -= 8;
	ret = 0;

	/* Clear this flag again */
	spin_lock_irqsave(&priv->driver_lock, flags);
	priv->dnld_sent = DNLD_RES_RECEIVED;
	spin_unlock_irqrestore(&priv->driver_lock, flags);

out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d, len %d", ret, *len);
	return ret;
}

static struct sk_buff *if_cs_receive_data(struct lbs_private *priv)
{
	struct sk_buff *skb = NULL;
	u16 len;
	u8 *data;

	lbs_deb_enter(LBS_DEB_CS);

	len = if_cs_read16(priv->card, IF_CS_READ_LEN);
	if (len == 0 || len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
		lbs_pr_err("card data buffer has invalid # of bytes (%d)\n", len);
		priv->dev->stats.rx_dropped++;
		goto dat_err;
	}

	skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + 2);
	if (!skb)
		goto out;
	skb_put(skb, len);
	skb_reserve(skb, 2);/* 16 byte align */
	data = skb->data;

	/* read even number of bytes, then odd byte if necessary */
	if_cs_read16_rep(priv->card, IF_CS_READ, data, len/sizeof(u16));
	if (len & 1)
		data[len-1] = if_cs_read8(priv->card, IF_CS_READ);

dat_err:
	if_cs_write16(priv->card, IF_CS_HOST_STATUS, IF_CS_BIT_RX);
	if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_RX);

out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %p", skb);
	return skb;
}

static irqreturn_t if_cs_interrupt(int irq, void *data)
{
	struct if_cs_card *card = data;
	struct lbs_private *priv = card->priv;
	u16 cause;

	lbs_deb_enter(LBS_DEB_CS);

	/* Ask card interrupt cause register if there is something for us */
	cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE);
	lbs_deb_cs("cause 0x%04x\n", cause);

	if (cause == 0) {
		/* Not for us */
		return IRQ_NONE;
	}

	if (cause == 0xffff) {
		/* Read in junk, the card has probably been removed */
		card->priv->surpriseremoved = 1;
		return IRQ_HANDLED;
	}

	if (cause & IF_CS_BIT_RX) {
		struct sk_buff *skb;
		lbs_deb_cs("rx packet\n");
		skb = if_cs_receive_data(priv);
		if (skb)
			lbs_process_rxed_packet(priv, skb);
	}

	if (cause & IF_CS_BIT_TX) {
		lbs_deb_cs("tx done\n");
		lbs_host_to_card_done(priv);
	}

	if (cause & IF_CS_BIT_RESP) {
		unsigned long flags;
		u8 i;

		lbs_deb_cs("cmd resp\n");
		spin_lock_irqsave(&priv->driver_lock, flags);
		i = (priv->resp_idx == 0) ? 1 : 0;
		spin_unlock_irqrestore(&priv->driver_lock, flags);

		BUG_ON(priv->resp_len[i]);
		if_cs_receive_cmdres(priv, priv->resp_buf[i],
			&priv->resp_len[i]);

		spin_lock_irqsave(&priv->driver_lock, flags);
		lbs_notify_command_response(priv, i);
		spin_unlock_irqrestore(&priv->driver_lock, flags);
	}

	if (cause & IF_CS_BIT_EVENT) {
		u16 status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
		if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE,
			IF_CS_BIT_EVENT);
		lbs_queue_event(priv, (status & IF_CS_CARD_STATUS_MASK) >> 8);
	}

	/* Clear interrupt cause */
	if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK);

	lbs_deb_leave(LBS_DEB_CS);
	return IRQ_HANDLED;
}


/********************************************************************/
/* Firmware                                                         */
/********************************************************************/

/*
 * Tries to program the helper firmware.
 *
 * Return 0 on success
 */
static int if_cs_prog_helper(struct if_cs_card *card)
{
	int ret = 0;
	int sent = 0;
	u8  scratch;
	const struct firmware *fw;

	lbs_deb_enter(LBS_DEB_CS);

	scratch = if_cs_read8(card, IF_CS_SCRATCH);

	/* "If the value is 0x5a, the firmware is already
	 * downloaded successfully"
	 */
	if (scratch == IF_CS_SCRATCH_HELPER_OK)
		goto done;

	/* "If the value is != 00, it is invalid value of register */
	if (scratch != IF_CS_SCRATCH_BOOT_OK) {
		ret = -ENODEV;
		goto done;
	}

	/* TODO: make firmware file configurable */
	ret = request_firmware(&fw, "libertas_cs_helper.fw",
		&handle_to_dev(card->p_dev));
	if (ret) {
		lbs_pr_err("can't load helper firmware\n");
		ret = -ENODEV;
		goto done;
	}
	lbs_deb_cs("helper size %td\n", fw->size);

	/* "Set the 5 bytes of the helper image to 0" */
	/* Not needed, this contains an ARM branch instruction */

	for (;;) {
		/* "the number of bytes to send is 256" */
		int count = 256;
		int remain = fw->size - sent;

		if (remain < count)
			count = remain;

		/* "write the number of bytes to be sent to the I/O Command
		 * write length register" */
		if_cs_write16(card, IF_CS_CMD_LEN, count);

		/* "write this to I/O Command port register as 16 bit writes */
		if (count)
			if_cs_write16_rep(card, IF_CS_CMD,
				&fw->data[sent],
				count >> 1);

		/* "Assert the download over interrupt command in the Host
		 * status register" */
		if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);

		/* "Assert the download over interrupt command in the Card
		 * interrupt case register" */
		if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);

		/* "The host polls the Card Status register ... for 50 ms before
		   declaring a failure */
		ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
			IF_CS_BIT_COMMAND);
		if (ret < 0) {
			lbs_pr_err("can't download helper at 0x%x, ret %d\n",
				sent, ret);
			goto err_release;
		}

		if (count == 0)
			break;

		sent += count;
	}

err_release:
	release_firmware(fw);
done:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


static int if_cs_prog_real(struct if_cs_card *card)
{
	const struct firmware *fw;
	int ret = 0;
	int retry = 0;
	int len = 0;
	int sent;

	lbs_deb_enter(LBS_DEB_CS);

	/* TODO: make firmware file configurable */
	ret = request_firmware(&fw, "libertas_cs.fw",
		&handle_to_dev(card->p_dev));
	if (ret) {
		lbs_pr_err("can't load firmware\n");
		ret = -ENODEV;
		goto done;
	}
	lbs_deb_cs("fw size %td\n", fw->size);

	ret = if_cs_poll_while_fw_download(card, IF_CS_SQ_READ_LOW,
		IF_CS_SQ_HELPER_OK);
	if (ret < 0) {
		lbs_pr_err("helper firmware doesn't answer\n");
		goto err_release;
	}

	for (sent = 0; sent < fw->size; sent += len) {
		len = if_cs_read16(card, IF_CS_SQ_READ_LOW);
		if (len & 1) {
			retry++;
			lbs_pr_info("odd, need to retry this firmware block\n");
		} else {
			retry = 0;
		}

		if (retry > 20) {
			lbs_pr_err("could not download firmware\n");
			ret = -ENODEV;
			goto err_release;
		}
		if (retry) {
			sent -= len;
		}


		if_cs_write16(card, IF_CS_CMD_LEN, len);

		if_cs_write16_rep(card, IF_CS_CMD,
			&fw->data[sent],
			(len+1) >> 1);
		if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
		if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);

		ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_STATUS,
			IF_CS_BIT_COMMAND);
		if (ret < 0) {
			lbs_pr_err("can't download firmware at 0x%x\n", sent);
			goto err_release;
		}
	}

	ret = if_cs_poll_while_fw_download(card, IF_CS_SCRATCH, 0x5a);
	if (ret < 0)
		lbs_pr_err("firmware download failed\n");

err_release:
	release_firmware(fw);

done:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


/********************************************************************/
/* Callback functions for libertas.ko                               */
/********************************************************************/

/* Send commands or data packets to the card */
static int if_cs_host_to_card(struct lbs_private *priv,
	u8 type,
	u8 *buf,
	u16 nb)
{
	int ret = -1;

	lbs_deb_enter_args(LBS_DEB_CS, "type %d, bytes %d", type, nb);

	switch (type) {
	case MVMS_DAT:
		priv->dnld_sent = DNLD_DATA_SENT;
		if_cs_send_data(priv, buf, nb);
		ret = 0;
		break;
	case MVMS_CMD:
		priv->dnld_sent = DNLD_CMD_SENT;
		ret = if_cs_send_cmd(priv, buf, nb);
		break;
	default:
		lbs_pr_err("%s: unsupported type %d\n", __func__, type);
	}

	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


/********************************************************************/
/* Card Services                                                    */
/********************************************************************/

/*
 * After a card is removed, if_cs_release() will unregister the
 * device, and release the PCMCIA configuration.  If the device is
 * still open, this will be postponed until it is closed.
 */
static void if_cs_release(struct pcmcia_device *p_dev)
{
	struct if_cs_card *card = p_dev->priv;

	lbs_deb_enter(LBS_DEB_CS);

	free_irq(p_dev->irq.AssignedIRQ, card);
	pcmcia_disable_device(p_dev);
	if (card->iobase)
		ioport_unmap(card->iobase);

	lbs_deb_leave(LBS_DEB_CS);
}


/*
 * This creates an "instance" of the driver, allocating local data
 * structures for one device.  The device is registered with Card
 * Services.
 *
 * The dev_link structure is initialized, but we don't actually
 * configure the card at this point -- we wait until we receive a card
 * insertion event.
 */
static int if_cs_probe(struct pcmcia_device *p_dev)
{
	int ret = -ENOMEM;
	unsigned int prod_id;
	struct lbs_private *priv;
	struct if_cs_card *card;
	/* CIS parsing */
	tuple_t tuple;
	cisparse_t parse;
	cistpl_cftable_entry_t *cfg = &parse.cftable_entry;
	cistpl_io_t *io = &cfg->io;
	u_char buf[64];

	lbs_deb_enter(LBS_DEB_CS);

	card = kzalloc(sizeof(struct if_cs_card), GFP_KERNEL);
	if (!card) {
		lbs_pr_err("error in kzalloc\n");
		goto out;
	}
	card->p_dev = p_dev;
	p_dev->priv = card;

	p_dev->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING;
	p_dev->irq.Handler = NULL;
	p_dev->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;

	p_dev->conf.Attributes = 0;
	p_dev->conf.IntType = INT_MEMORY_AND_IO;

	tuple.Attributes = 0;
	tuple.TupleData = buf;
	tuple.TupleDataMax = sizeof(buf);
	tuple.TupleOffset = 0;

	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
	if ((ret = pcmcia_get_first_tuple(p_dev, &tuple)) != 0 ||
	    (ret = pcmcia_get_tuple_data(p_dev, &tuple)) != 0 ||
	    (ret = pcmcia_parse_tuple(&tuple, &parse)) != 0)
	{
		lbs_pr_err("error in pcmcia_get_first_tuple etc\n");
		goto out1;
	}

	p_dev->conf.ConfigIndex = cfg->index;

	/* Do we need to allocate an interrupt? */
	if (cfg->irq.IRQInfo1) {
		p_dev->conf.Attributes |= CONF_ENABLE_IRQ;
	}

	/* IO window settings */
	if (cfg->io.nwin != 1) {
		lbs_pr_err("wrong CIS (check number of IO windows)\n");
		ret = -ENODEV;
		goto out1;
	}
	p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
	p_dev->io.BasePort1 = io->win[0].base;
	p_dev->io.NumPorts1 = io->win[0].len;

	/* This reserves IO space but doesn't actually enable it */
	ret = pcmcia_request_io(p_dev, &p_dev->io);
	if (ret) {
		lbs_pr_err("error in pcmcia_request_io\n");
		goto out1;
	}

	/*
	 * Allocate an interrupt line.  Note that this does not assign
	 * a handler to the interrupt, unless the 'Handler' member of
	 * the irq structure is initialized.
	 */
	if (p_dev->conf.Attributes & CONF_ENABLE_IRQ) {
		ret = pcmcia_request_irq(p_dev, &p_dev->irq);
		if (ret) {
			lbs_pr_err("error in pcmcia_request_irq\n");
			goto out1;
		}
	}

	/* Initialize io access */
	card->iobase = ioport_map(p_dev->io.BasePort1, p_dev->io.NumPorts1);
	if (!card->iobase) {
		lbs_pr_err("error in ioport_map\n");
		ret = -EIO;
		goto out1;
	}

	/*
	 * This actually configures the PCMCIA socket -- setting up
	 * the I/O windows and the interrupt mapping, and putting the
	 * card and host interface into "Memory and IO" mode.
	 */
	ret = pcmcia_request_configuration(p_dev, &p_dev->conf);
	if (ret) {
		lbs_pr_err("error in pcmcia_request_configuration\n");
		goto out2;
	}

	/* Finally, report what we've done */
	lbs_deb_cs("irq %d, io 0x%04x-0x%04x\n",
	       p_dev->irq.AssignedIRQ, p_dev->io.BasePort1,
	       p_dev->io.BasePort1 + p_dev->io.NumPorts1 - 1);

	/* Check if we have a current silicon */
	prod_id = if_cs_read8(card, IF_CS_PRODUCT_ID);
	if (if_cs_hw_is_cf8381(p_dev) && prod_id < IF_CS_CF8381_B3_REV) {
		lbs_pr_err("old chips like 8381 rev B3 aren't supported\n");
		ret = -ENODEV;
		goto out2;
	}

	if (if_cs_hw_is_cf8385(p_dev) && prod_id < IF_CS_CF8385_B1_REV) {
		lbs_pr_err("old chips like 8385 rev B1 aren't supported\n");
		ret = -ENODEV;
		goto out2;
	}

	/* Load the firmware early, before calling into libertas.ko */
	ret = if_cs_prog_helper(card);
	if (ret == 0)
		ret = if_cs_prog_real(card);
	if (ret)
		goto out2;

	/* Make this card known to the libertas driver */
	priv = lbs_add_card(card, &p_dev->dev);
	if (!priv) {
		ret = -ENOMEM;
		goto out2;
	}

	/* Finish setting up fields in lbs_private */
	card->priv = priv;
	priv->card = card;
	priv->hw_host_to_card = if_cs_host_to_card;
	priv->fw_ready = 1;

	/* Now actually get the IRQ */
	ret = request_irq(p_dev->irq.AssignedIRQ, if_cs_interrupt,
		IRQF_SHARED, DRV_NAME, card);
	if (ret) {
		lbs_pr_err("error in request_irq\n");
		goto out3;
	}

	/* Clear any interrupt cause that happend while sending
	 * firmware/initializing card */
	if_cs_write16(card, IF_CS_CARD_INT_CAUSE, IF_CS_BIT_MASK);
	if_cs_enable_ints(card);

	/* And finally bring the card up */
	if (lbs_start_card(priv) != 0) {
		lbs_pr_err("could not activate card\n");
		goto out3;
	}

	ret = 0;
	goto out;

out3:
	lbs_remove_card(priv);
out2:
	ioport_unmap(card->iobase);
out1:
	pcmcia_disable_device(p_dev);
out:
	lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
	return ret;
}


/*
 * This deletes a driver "instance".  The device is de-registered with
 * Card Services.  If it has been released, all local data structures
 * are freed.  Otherwise, the structures will be freed when the device
 * is released.
 */
static void if_cs_detach(struct pcmcia_device *p_dev)
{
	struct if_cs_card *card = p_dev->priv;

	lbs_deb_enter(LBS_DEB_CS);

	lbs_stop_card(card->priv);
	lbs_remove_card(card->priv);
	if_cs_disable_ints(card);
	if_cs_release(p_dev);
	kfree(card);

	lbs_deb_leave(LBS_DEB_CS);
}


/********************************************************************/
/* Module initialization                                            */
/********************************************************************/

static struct pcmcia_device_id if_cs_ids[] = {
	PCMCIA_DEVICE_MANF_CARD(CF8381_MANFID, CF8381_CARDID),
	PCMCIA_DEVICE_MANF_CARD(CF8385_MANFID, CF8385_CARDID),
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, if_cs_ids);


static struct pcmcia_driver lbs_driver = {
	.owner		= THIS_MODULE,
	.drv		= {
		.name	= DRV_NAME,
	},
	.probe		= if_cs_probe,
	.remove		= if_cs_detach,
	.id_table       = if_cs_ids,
};


static int __init if_cs_init(void)
{
	int ret;

	lbs_deb_enter(LBS_DEB_CS);
	ret = pcmcia_register_driver(&lbs_driver);
	lbs_deb_leave(LBS_DEB_CS);
	return ret;
}


static void __exit if_cs_exit(void)
{
	lbs_deb_enter(LBS_DEB_CS);
	pcmcia_unregister_driver(&lbs_driver);
	lbs_deb_leave(LBS_DEB_CS);
}


module_init(if_cs_init);
module_exit(if_cs_exit);