path: root/drivers/bluetooth/btmrvl_sdio.c

/**
 * Marvell BT-over-SDIO driver: SDIO interface related functions.
 *
 * Copyright (C) 2009, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 **/

#include <linux/firmware.h>
#include <linux/slab.h>

#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "btmrvl_drv.h"
#include "btmrvl_sdio.h"

#define VERSION "1.0"

/* The btmrvl_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.
 * If the user is removing the module, a MODULE_SHUTDOWN_REQ
 * command is sent to firmware and interrupt will be disabled.
 * If the card is removed, there is no need to send command
 * or disable interrupt.
 *
 * 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 const struct btmrvl_sdio_device btmrvl_sdio_sd6888 = {
	.helper		= "sd8688_helper.bin",
	.firmware	= "sd8688.bin",
};

static const struct sdio_device_id btmrvl_sdio_ids[] = {
	/* Marvell SD8688 Bluetooth device */
	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x9105),
			.driver_data = (unsigned long) &btmrvl_sdio_sd6888 },

	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(sdio, btmrvl_sdio_ids);

static int btmrvl_sdio_get_rx_unit(struct btmrvl_sdio_card *card)
{
	u8 reg;
	int ret;

	reg = sdio_readb(card->func, CARD_RX_UNIT_REG, &ret);
	if (!ret)
		card->rx_unit = reg;

	return ret;
}

static int btmrvl_sdio_read_fw_status(struct btmrvl_sdio_card *card, u16 *dat)
{
	u8 fws0, fws1;
	int ret;

	*dat = 0;

	fws0 = sdio_readb(card->func, CARD_FW_STATUS0_REG, &ret);

	if (!ret)
		fws1 = sdio_readb(card->func, CARD_FW_STATUS1_REG, &ret);

	if (ret)
		return -EIO;

	*dat = (((u16) fws1) << 8) | fws0;

	return 0;
}

static int btmrvl_sdio_read_rx_len(struct btmrvl_sdio_card *card, u16 *dat)
{
	u8 reg;
	int ret;

	reg = sdio_readb(card->func, CARD_RX_LEN_REG, &ret);
	if (!ret)
		*dat = (u16) reg << card->rx_unit;

	return ret;
}

static int btmrvl_sdio_enable_host_int_mask(struct btmrvl_sdio_card *card,
								u8 mask)
{
	int ret;

	sdio_writeb(card->func, mask, HOST_INT_MASK_REG, &ret);
	if (ret) {
		BT_ERR("Unable to enable the host interrupt!");
		ret = -EIO;
	}

	return ret;
}

static int btmrvl_sdio_disable_host_int_mask(struct btmrvl_sdio_card *card,
								u8 mask)
{
	u8 host_int_mask;
	int ret;

	host_int_mask = sdio_readb(card->func, HOST_INT_MASK_REG, &ret);
	if (ret)
		return -EIO;

	host_int_mask &= ~mask;

	sdio_writeb(card->func, host_int_mask, HOST_INT_MASK_REG, &ret);
	if (ret < 0) {
		BT_ERR("Unable to disable the host interrupt!");
		return -EIO;
	}

	return 0;
}

static int btmrvl_sdio_poll_card_status(struct btmrvl_sdio_card *card, u8 bits)
{
	unsigned int tries;
	u8 status;
	int ret;

	for (tries = 0; tries < MAX_POLL_TRIES * 1000; tries++) {
		status = sdio_readb(card->func, CARD_STATUS_REG, &ret);
		if (ret)
			goto failed;
		if ((status & bits) == bits)
			return ret;

		udelay(1);
	}

	ret = -ETIMEDOUT;

failed:
	BT_ERR("FAILED! ret=%d", ret);

	return ret;
}

static int btmrvl_sdio_verify_fw_download(struct btmrvl_sdio_card *card,
								int pollnum)
{
	int ret = -ETIMEDOUT;
	u16 firmwarestat;
	unsigned int tries;

	 /* Wait for firmware to become ready */