path: root/drivers/net/wireless/libertas/if_sdio.c

/*
 *  linux/drivers/net/wireless/libertas/if_sdio.c
 *
 *  Copyright 2007-2008 Pierre Ossman
 *
 * Inspired by if_cs.c, Copyright 2007 Holger Schurig
 *
 * 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 hardware has more or less no CMD53 support, so all registers
 * must be accessed using sdio_readb()/sdio_writeb().
 *
 * Transfers must be in one transaction or the firmware goes bonkers.
 * This means that the transfer must either be small enough to do a
 * byte based transfer or it must be padded to a multiple of the
 * current block size.
 *
 * As SDIO is still new to the kernel, it is unfortunately common with
 * bugs in the host controllers related to that. One such bug is that
 * controllers cannot do transfers that aren't a multiple of 4 bytes.
 * If you don't have time to fix the host controller driver, you can
 * work around the problem by modifying if_sdio_host_to_card() and
 * if_sdio_card_to_host() to pad the data.
 */

#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>

#include "host.h"
#include "decl.h"
#include "defs.h"
#include "dev.h"
#include "cmd.h"
#include "if_sdio.h"

/* The if_sdio_remove() callback function is called when
 * user removes this module from kernel space or ejects
 * the card from the slot. The driver handles these 2 cases
 * differently for SD8688 combo chip.
 * If the user is removing the module, the FUNC_SHUTDOWN
 * command for SD8688 is sent to the firmware.
 * If the card is removed, there is no need to send this command.
 *
 * The variable 'user_rmmod' is used to distinguish these two
 * scenarios. This flag is initialized as FALSE in case the card
 * is removed, and will be set to TRUE for module removal when
 * module_exit function is called.
 */
static u8 user_rmmod;

static char *lbs_helper_name = NULL;
module_param_named(helper_name, lbs_helper_name, charp, 0644);

static char *lbs_fw_name = NULL;
module_param_named(fw_name, lbs_fw_name, charp, 0644);

static const struct sdio_device_id if_sdio_ids[] = {
	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
			SDIO_DEVICE_ID_MARVELL_LIBERTAS) },
	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
			SDIO_DEVICE_ID_MARVELL_8688WLAN) },
	{ /* end: all zeroes */				},
};

MODULE_DEVICE_TABLE(sdio, if_sdio_ids);

struct if_sdio_model {
	int model;
	const char *helper;
	const char *firmware;
};

static struct if_sdio_model if_sdio_models[] = {
	{
		/* 8385 */
		.model = IF_SDIO_MODEL_8385,
		.helper = "sd8385_helper.bin",
		.firmware = "sd8385.bin",
	},
	{
		/* 8686 */
		.model = IF_SDIO_MODEL_8686,
		.helper = "sd8686_helper.bin",
		.firmware = "sd8686.bin",
	},
	{
		/* 8688 */
		.model = IF_SDIO_MODEL_8688,
		.helper = "sd8688_helper.bin",
		.firmware = "sd8688.bin",
	},
};

struct if_sdio_packet {
	struct if_sdio_packet	*next;
	u16			nb;
	u8			buffer[0] __attribute__((aligned(4)));
};

struct if_sdio_card {
	struct sdio_func	*func;
	struct lbs_private	*priv;

	int			model;
	unsigned long		ioport;
	unsigned int		scratch_reg;

	const char		*helper;
	const char		*firmware;

	u8			buffer[65536];

	spinlock_t		lock;
	struct if_sdio_packet	*packets;

	struct workqueue_struct	*workqueue;
	struct work_struct	packet_worker;

	u8			rx_unit;
};

/********************************************************************/
/* I/O                                                              */
/********************************************************************/

/*
 *  For SD8385/SD8686, this function reads firmware status after
 *  the image is downloaded, or reads RX packet length when
 *  interrupt (with IF_SDIO_H_INT_UPLD bit set) is received.
 *  For SD8688, this function reads firmware status only.
 */
static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
{
	int ret;
	u16 scratch;

	scratch = sdio_readb(card->func, card->scratch_reg, &ret);
	if (!ret)
		scratch |= sdio_readb(</