drivers/bluetooth/btmrvl_sdio.c - kernel/msm-4.9 - Gitiles

 /**
  * 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/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 */
 	for (tries = 0; tries < pollnum; tries++) {
 		if (btmrvl_sdio_read_fw_status(card, &firmwarestat) < 0)
 			continue;

 		if (firmwarestat == FIRMWARE_READY) {
 			ret = 0;
 			break;
 		} else {
 			msleep(10);
 		}
 	}

 	return ret;
 }

 static int btmrvl_sdio_download_helper(struct btmrvl_sdio_card *card)
 {
 	const struct firmware *fw_helper = NULL;
 	const u8 *helper = NULL;
 	int ret;
 	void *tmphlprbuf = NULL;
 	int tmphlprbufsz, hlprblknow, helperlen;
 	u8 *helperbuf;
 	u32 tx_len;

 	ret = request_firmware(&fw_helper, card->helper,
 						&card->func->dev);
 	if ((ret < 0) || !fw_helper) {
 		BT_ERR("request_firmware(helper) failed, error code = %d",
 									ret);
 		ret = -ENOENT;
 		goto done;
 	}

 	helper = fw_helper->data;
 	helperlen = fw_helper->size;

 	BT_DBG("Downloading helper image (%d bytes), block size %d bytes",
 						helperlen, SDIO_BLOCK_SIZE);

 	tmphlprbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);

 	tmphlprbuf = kmalloc(tmphlprbufsz, GFP_KERNEL);
 	if (!tmphlprbuf) {
 		BT_ERR("Unable to allocate buffer for helper."
 			" Terminating download");
 		ret = -ENOMEM;
 		goto done;
 	}

 	memset(tmphlprbuf, 0, tmphlprbufsz);

 	helperbuf = (u8 *) ALIGN_ADDR(tmphlprbuf, BTSDIO_DMA_ALIGN);

 	/* Perform helper data transfer */
 	tx_len = (FIRMWARE_TRANSFER_NBLOCK * SDIO_BLOCK_SIZE)
 			- SDIO_HEADER_LEN;
 	hlprblknow = 0;

 	do {
 		ret = btmrvl_sdio_poll_card_status(card,
 					    CARD_IO_READY | DN_LD_CARD_RDY);
 		if (ret < 0) {
 			BT_ERR("Helper download poll status timeout @ %d",
 				hlprblknow);
 			goto done;
 		}

 		/* Check if there is more data? */
 		if (hlprblknow >= helperlen)
 			break;

 		if (helperlen - hlprblknow < tx_len)
 			tx_len = helperlen - hlprblknow;

 		/* Little-endian */
 		helperbuf[0] = ((tx_len & 0x000000ff) >> 0);
 		helperbuf[1] = ((tx_len & 0x0000ff00) >> 8);
 		helperbuf[2] = ((tx_len & 0x00ff0000) >> 16);
 		helperbuf[3] = ((tx_len & 0xff000000) >> 24);

 		memcpy(&helperbuf[SDIO_HEADER_LEN], &helper[hlprblknow],
 				tx_len);

 		/* Now send the data */
 		ret = sdio_writesb(card->func, card->ioport, helperbuf,
 				FIRMWARE_TRANSFER_NBLOCK * SDIO_BLOCK_SIZE);
 		if (ret < 0) {
 			BT_ERR("IO error during helper download @ %d",
 				hlprblknow);
 			goto done;
 		}

 		hlprblknow += tx_len;
 	} while (true);

 	BT_DBG("Transferring helper image EOF block");

 	memset(helperbuf, 0x0, SDIO_BLOCK_SIZE);

 	ret = sdio_writesb(card->func, card->ioport, helperbuf,
 							SDIO_BLOCK_SIZE);
 	if (ret < 0) {
 		BT_ERR("IO error in writing helper image EOF block");
 		goto done;
 	}

 	ret = 0;

 done:
 	kfree(tmphlprbuf);
 	if (fw_helper)
 		release_firmware(fw_helper);

 	return ret;
 }

 static int btmrvl_sdio_download_fw_w_helper(struct btmrvl_sdio_card *card)
 {
 	const struct firmware *fw_firmware = NULL;
 	const u8 *firmware = NULL;
 	int firmwarelen, tmpfwbufsz, ret;
 	unsigned int tries, offset;
 	u8 base0, base1;
 	void *tmpfwbuf = NULL;
 	u8 *fwbuf;
 	u16 len;
 	int txlen = 0, tx_blocks = 0, count = 0;

 	ret = request_firmware(&fw_firmware, card->firmware,
 							&card->func->dev);
 	if ((ret < 0) || !fw_firmware) {
 		BT_ERR("request_firmware(firmware) failed, error code = %d",
 									ret);
 		ret = -ENOENT;
 		goto done;
 	}

 	firmware = fw_firmware->data;
 	firmwarelen = fw_firmware->size;

 	BT_DBG("Downloading FW image (%d bytes)", firmwarelen);

 	tmpfwbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);
 	tmpfwbuf = kmalloc(tmpfwbufsz, GFP_KERNEL);
 	if (!tmpfwbuf) {
 		BT_ERR("Unable to allocate buffer for firmware."
 		       " Terminating download");
 		ret = -ENOMEM;
 		goto done;
 	}

 	memset(tmpfwbuf, 0, tmpfwbufsz);

 	/* Ensure aligned firmware buffer */
 	fwbuf = (u8 *) ALIGN_ADDR(tmpfwbuf, BTSDIO_DMA_ALIGN);

 	/* Perform firmware data transfer */
 	offset = 0;
 	do {
 		ret = btmrvl_sdio_poll_card_status(card,
 					CARD_IO_READY | DN_LD_CARD_RDY);
 		if (ret < 0) {
 			BT_ERR("FW download with helper poll status"
 						" timeout @ %d", offset);
 			goto done;
 		}

 		/* Check if there is more data ? */
 		if (offset >= firmwarelen)
 			break;

 		for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
 			base0 = sdio_readb(card->func,
 					SQ_READ_BASE_ADDRESS_A0_REG, &ret);
 			if (ret) {
 				BT_ERR("BASE0 register read failed:"
 					" base0 = 0x%04X(%d)."
 					" Terminating download",
 					base0, base0);
 				ret = -EIO;
 				goto done;
 			}
 			base1 = sdio_readb(card->func,
 					SQ_READ_BASE_ADDRESS_A1_REG, &ret);
 			if (ret) {
 				BT_ERR("BASE1 register read failed:"
 					" base1 = 0x%04X(%d)."
 					" Terminating download",
 					base1, base1);
 				ret = -EIO;
 				goto done;
 			}

 			len = (((u16) base1) << 8) | base0;
 			if (len)
 				break;

 			udelay(10);
 		}

 		if (!len)
 			break;
 		else if (len > BTM_UPLD_SIZE) {
 			BT_ERR("FW download failure @%d, invalid length %d",
 								offset, len);
 			ret = -EINVAL;
 			goto done;
 		}

 		txlen = len;

 		if (len & BIT(0)) {
 			count++;
 			if (count > MAX_WRITE_IOMEM_RETRY) {
 				BT_ERR("FW download failure @%d, "
 					"over max retry count", offset);
 				ret = -EIO;
 				goto done;
 			}
 			BT_ERR("FW CRC error indicated by the helper: "
 				"len = 0x%04X, txlen = %d", len, txlen);
 			len &= ~BIT(0);
 			/* Set txlen to 0 so as to resend from same offset */
 			txlen = 0;
 		} else {
 			count = 0;

 			/* Last block ? */
 			if (firmwarelen - offset < txlen)
 				txlen = firmwarelen - offset;

 			tx_blocks =
 			    (txlen + SDIO_BLOCK_SIZE - 1) / SDIO_BLOCK_SIZE;

 			memcpy(fwbuf, &firmware[offset], txlen);
 		}

 		ret = sdio_writesb(card->func, card->ioport, fwbuf,
 					tx_blocks * SDIO_BLOCK_SIZE);

 		if (ret < 0) {
 			BT_ERR("FW download, writesb(%d) failed @%d",
 							count, offset);
 			sdio_writeb(card->func, HOST_CMD53_FIN, CONFIG_REG,
 									&ret);
 			if (ret)
 				BT_ERR("writeb failed (CFG)");
 		}

 		offset += txlen;
 	} while (true);

 	BT_DBG("FW download over, size %d bytes", offset);

 	ret = 0;

 done:
 	kfree(tmpfwbuf);

 	if (fw_firmware)
 		release_firmware(fw_firmware);

 	return ret;
 }

 static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
 {
 	u16 buf_len = 0;
 	int ret, buf_block_len, blksz;
 	struct sk_buff *skb = NULL;
 	u32 type;
 	u8 *payload = NULL;
 	struct hci_dev *hdev = priv->btmrvl_dev.hcidev;
 	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;

 	if (!card || !card->func) {
 		BT_ERR("card or function is NULL!");
 		ret = -EINVAL;
 		goto exit;
 	}

 	/* Read the length of data to be transferred */
 	ret = btmrvl_sdio_read_rx_len(card, &buf_len);
 	if (ret < 0) {
 		BT_ERR("read rx_len failed");
 		ret = -EIO;
 		goto exit;
 	}

 	blksz = SDIO_BLOCK_SIZE;
 	buf_block_len = (buf_len + blksz - 1) / blksz;

 	if (buf_len <= SDIO_HEADER_LEN
 			|| (buf_block_len * blksz) > ALLOC_BUF_SIZE) {
 		BT_ERR("invalid packet length: %d", buf_len);
 		ret = -EINVAL;
 		goto exit;
 	}

 	/* Allocate buffer */
 	skb = bt_skb_alloc(buf_block_len * blksz + BTSDIO_DMA_ALIGN,
 								GFP_ATOMIC);
 	if (skb == NULL) {
 		BT_ERR("No free skb");
 		goto exit;
 	}

 	if ((unsigned long) skb->data & (BTSDIO_DMA_ALIGN - 1)) {
 		skb_put(skb, (unsigned long) skb->data &
 					(BTSDIO_DMA_ALIGN - 1));
 		skb_pull(skb, (unsigned long) skb->data &
 					(BTSDIO_DMA_ALIGN - 1));
 	}

 	payload = skb->data;

 	ret = sdio_readsb(card->func, payload, card->ioport,
 			  buf_block_len * blksz);
 	if (ret < 0) {
 		BT_ERR("readsb failed: %d", ret);
 		ret = -EIO;
 		goto exit;
 	}

 	/* This is SDIO specific header length: byte[2][1][0], type: byte[3]
 	 * (HCI_COMMAND = 1, ACL_DATA = 2, SCO_DATA = 3, 0xFE = Vendor)
 	 */

 	buf_len = payload[0];
 	buf_len |= (u16) payload[1] << 8;
 	type = payload[3];

 	switch (type) {
 	case HCI_ACLDATA_PKT:
 	case HCI_SCODATA_PKT:
 	case HCI_EVENT_PKT:
 		bt_cb(skb)->pkt_type = type;
 		skb->dev = (void *)hdev;
 		skb_put(skb, buf_len);
 		skb_pull(skb, SDIO_HEADER_LEN);

 		if (type == HCI_EVENT_PKT)
 			btmrvl_check_evtpkt(priv, skb);

 		hci_recv_frame(skb);
 		hdev->stat.byte_rx += buf_len;
 		break;

 	case MRVL_VENDOR_PKT:
 		bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
 		skb->dev = (void *)hdev;
 		skb_put(skb, buf_len);
 		skb_pull(skb, SDIO_HEADER_LEN);

 		if (btmrvl_process_event(priv, skb))
 			hci_recv_frame(skb);

 		hdev->stat.byte_rx += buf_len;
 		break;

 	default:
 		BT_ERR("Unknown packet type:%d", type);
 		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, payload,
 						blksz * buf_block_len);

 		kfree_skb(skb);
 		skb = NULL;
 		break;
 	}

 exit:
 	if (ret) {
 		hdev->stat.err_rx++;
 		if (skb)
 			kfree_skb(skb);
 	}

 	return ret;
 }

 static int btmrvl_sdio_get_int_status(struct btmrvl_private *priv, u8 * ireg)
 {
 	int ret;
 	u8 sdio_ireg = 0;
 	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;

 	*ireg = 0;

 	sdio_ireg = sdio_readb(card->func, HOST_INTSTATUS_REG, &ret);
 	if (ret) {
 		BT_ERR("sdio_readb: read int status register failed");
 		ret = -EIO;
 		goto done;
 	}

 	if (sdio_ireg != 0) {
 		/*
 		 * DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
 		 * Clear the interrupt status register and re-enable the
 		 * interrupt.
 		 */
 		BT_DBG("sdio_ireg = 0x%x", sdio_ireg);

 		sdio_writeb(card->func, ~(sdio_ireg) & (DN_LD_HOST_INT_STATUS |
 							UP_LD_HOST_INT_STATUS),
 			    HOST_INTSTATUS_REG, &ret);
 		if (ret) {
 			BT_ERR("sdio_writeb: clear int status register "
 				"failed");
 			ret = -EIO;
 			goto done;
 		}
 	}

 	if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
 		if (priv->btmrvl_dev.tx_dnld_rdy)
 			BT_DBG("tx_done already received: "
 				" int_status=0x%x", sdio_ireg);
 		else
 			priv->btmrvl_dev.tx_dnld_rdy = true;
 	}

 	if (sdio_ireg & UP_LD_HOST_INT_STATUS)
 		btmrvl_sdio_card_to_host(priv);

 	*ireg = sdio_ireg;

 	ret = 0;

 done:
 	return ret;
 }

 static void btmrvl_sdio_interrupt(struct sdio_func *func)
 {
 	struct btmrvl_private *priv;
 	struct hci_dev *hcidev;
 	struct btmrvl_sdio_card *card;
 	u8 ireg = 0;

 	card = sdio_get_drvdata(func);
 	if (card && card->priv) {
 		priv = card->priv;
 		hcidev = priv->btmrvl_dev.hcidev;

 		if (btmrvl_sdio_get_int_status(priv, &ireg))
 			BT_ERR("reading HOST_INT_STATUS_REG failed");
 		else
 			BT_DBG("HOST_INT_STATUS_REG %#x", ireg);

 		btmrvl_interrupt(priv);
 	}
 }

 static int btmrvl_sdio_register_dev(struct btmrvl_sdio_card *card)
 {
 	struct sdio_func *func;
 	u8 reg;
 	int ret = 0;

 	if (!card || !card->func) {
 		BT_ERR("Error: card or function is NULL!");
 		ret = -EINVAL;
 		goto failed;
 	}

 	func = card->func;

 	sdio_claim_host(func);

 	ret = sdio_enable_func(func);
 	if (ret) {
 		BT_ERR("sdio_enable_func() failed: ret=%d", ret);
 		ret = -EIO;
 		goto release_host;
 	}

 	ret = sdio_claim_irq(func, btmrvl_sdio_interrupt);
 	if (ret) {
 		BT_ERR("sdio_claim_irq failed: ret=%d", ret);
 		ret = -EIO;
 		goto disable_func;
 	}

 	ret = sdio_set_block_size(card->func, SDIO_BLOCK_SIZE);
 	if (ret) {
 		BT_ERR("cannot set SDIO block size");
 		ret = -EIO;
 		goto release_irq;
 	}

 	reg = sdio_readb(func, IO_PORT_0_REG, &ret);
 	if (ret < 0) {
 		ret = -EIO;
 		goto release_irq;
 	}

 	card->ioport = reg;

 	reg = sdio_readb(func, IO_PORT_1_REG, &ret);
 	if (ret < 0) {
 		ret = -EIO;
 		goto release_irq;
 	}

 	card->ioport |= (reg << 8);

 	reg = sdio_readb(func, IO_PORT_2_REG, &ret);
 	if (ret < 0) {
 		ret = -EIO;
 		goto release_irq;
 	}

 	card->ioport |= (reg << 16);

 	BT_DBG("SDIO FUNC%d IO port: 0x%x", func->num, card->ioport);

 	sdio_set_drvdata(func, card);

 	sdio_release_host(func);

 	return 0;

 release_irq:
 	sdio_release_irq(func);

 disable_func:
 	sdio_disable_func(func);

 release_host:
 	sdio_release_host(func);

 failed:
 	return ret;
 }

 static int btmrvl_sdio_unregister_dev(struct btmrvl_sdio_card *card)
 {
 	if (card && card->func) {
 		sdio_claim_host(card->func);
 		sdio_release_irq(card->func);
 		sdio_disable_func(card->func);
 		sdio_release_host(card->func);
 		sdio_set_drvdata(card->func, NULL);
 	}

 	return 0;
 }

 static int btmrvl_sdio_enable_host_int(struct btmrvl_sdio_card *card)
 {
 	int ret;

 	if (!card || !card->func)
 		return -EINVAL;

 	sdio_claim_host(card->func);

 	ret = btmrvl_sdio_enable_host_int_mask(card, HIM_ENABLE);

 	btmrvl_sdio_get_rx_unit(card);

 	sdio_release_host(card->func);

 	return ret;
 }

 static int btmrvl_sdio_disable_host_int(struct btmrvl_sdio_card *card)
 {
 	int ret;

 	if (!card || !card->func)
 		return -EINVAL;

 	sdio_claim_host(card->func);

 	ret = btmrvl_sdio_disable_host_int_mask(card, HIM_DISABLE);

 	sdio_release_host(card->func);

 	return ret;
 }

 static int btmrvl_sdio_host_to_card(struct btmrvl_private *priv,
 				u8 *payload, u16 nb)
 {
 	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
 	int ret = 0;
 	int buf_block_len;
 	int blksz;
 	int i = 0;
 	u8 *buf = NULL;
 	void *tmpbuf = NULL;
 	int tmpbufsz;

 	if (!card || !card->func) {
 		BT_ERR("card or function is NULL!");
 		return -EINVAL;
 	}

 	buf = payload;
 	if ((unsigned long) payload & (BTSDIO_DMA_ALIGN - 1)) {
 		tmpbufsz = ALIGN_SZ(nb, BTSDIO_DMA_ALIGN);
 		tmpbuf = kzalloc(tmpbufsz, GFP_KERNEL);
 		if (!tmpbuf)
 			return -ENOMEM;
 		buf = (u8 *) ALIGN_ADDR(tmpbuf, BTSDIO_DMA_ALIGN);
 		memcpy(buf, payload, nb);
 	}

 	blksz = SDIO_BLOCK_SIZE;
 	buf_block_len = (nb + blksz - 1) / blksz;

 	sdio_claim_host(card->func);

 	do {
 		/* Transfer data to card */
 		ret = sdio_writesb(card->func, card->ioport, buf,
 				   buf_block_len * blksz);
 		if (ret < 0) {
 			i++;
 			BT_ERR("i=%d writesb failed: %d", i, ret);
 			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
 						payload, nb);
 			ret = -EIO;
 			if (i > MAX_WRITE_IOMEM_RETRY)
 				goto exit;
 		}
 	} while (ret);

 	priv->btmrvl_dev.tx_dnld_rdy = false;

 exit:
 	sdio_release_host(card->func);

 	return ret;
 }

 static int btmrvl_sdio_download_fw(struct btmrvl_sdio_card *card)
 {
 	int ret = 0;

 	if (!card || !card->func) {
 		BT_ERR("card or function is NULL!");
 		return -EINVAL;
 	}
 	sdio_claim_host(card->func);

 	if (!btmrvl_sdio_verify_fw_download(card, 1)) {
 		BT_DBG("Firmware already downloaded!");
 		goto done;
 	}

 	ret = btmrvl_sdio_download_helper(card);
 	if (ret) {
 		BT_ERR("Failed to download helper!");
 		ret = -EIO;
 		goto done;
 	}

 	if (btmrvl_sdio_download_fw_w_helper(card)) {
 		BT_ERR("Failed to download firmware!");
 		ret = -EIO;
 		goto done;
 	}

 	if (btmrvl_sdio_verify_fw_download(card, MAX_POLL_TRIES)) {
 		BT_ERR("FW failed to be active in time!");
 		ret = -ETIMEDOUT;
 		goto done;
 	}

 done:
 	sdio_release_host(card->func);

 	return ret;
 }

 static int btmrvl_sdio_wakeup_fw(struct btmrvl_private *priv)
 {
 	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
 	int ret = 0;

 	if (!card || !card->func) {
 		BT_ERR("card or function is NULL!");
 		return -EINVAL;
 	}

 	sdio_claim_host(card->func);

 	sdio_writeb(card->func, HOST_POWER_UP, CONFIG_REG, &ret);

 	sdio_release_host(card->func);

 	BT_DBG("wake up firmware");

 	return ret;
 }

 static int btmrvl_sdio_probe(struct sdio_func *func,
 					const struct sdio_device_id *id)
 {
 	int ret = 0;
 	struct btmrvl_private *priv = NULL;
 	struct btmrvl_sdio_card *card = NULL;

 	BT_INFO("vendor=0x%x, device=0x%x, class=%d, fn=%d",
 			id->vendor, id->device, id->class, func->num);

 	card = kzalloc(sizeof(*card), GFP_KERNEL);
 	if (!card) {
 		ret = -ENOMEM;
 		goto done;
 	}

 	card->func = func;

 	if (id->driver_data) {
 		struct btmrvl_sdio_device *data = (void *) id->driver_data;
 		card->helper   = data->helper;
 		card->firmware = data->firmware;
 	}

 	if (btmrvl_sdio_register_dev(card) < 0) {
 		BT_ERR("Failed to register BT device!");
 		ret = -ENODEV;
 		goto free_card;
 	}

 	/* Disable the interrupts on the card */
 	btmrvl_sdio_disable_host_int(card);

 	if (btmrvl_sdio_download_fw(card)) {
 		BT_ERR("Downloading firmware failed!");
 		ret = -ENODEV;
 		goto unreg_dev;
 	}

 	msleep(100);

 	btmrvl_sdio_enable_host_int(card);

 	priv = btmrvl_add_card(card);
 	if (!priv) {
 		BT_ERR("Initializing card failed!");
 		ret = -ENODEV;
 		goto disable_host_int;
 	}

 	card->priv = priv;

 	/* Initialize the interface specific function pointers */
 	priv->hw_host_to_card = btmrvl_sdio_host_to_card;
 	priv->hw_wakeup_firmware = btmrvl_sdio_wakeup_fw;

 	btmrvl_send_module_cfg_cmd(priv, MODULE_BRINGUP_REQ);
 	priv->btmrvl_dev.psmode = 1;
 	btmrvl_enable_ps(priv);

 	return 0;

 disable_host_int:
 	btmrvl_sdio_disable_host_int(card);
 unreg_dev:
 	btmrvl_sdio_unregister_dev(card);
 free_card:
 	kfree(card);
 done:
 	return ret;
 }

 static void btmrvl_sdio_remove(struct sdio_func *func)
 {
 	struct btmrvl_sdio_card *card;

 	if (func) {
 		card = sdio_get_drvdata(func);
 		if (card) {
 			/* Send SHUTDOWN command & disable interrupt
 			 * if user removes the module.
 			 */
 			if (user_rmmod) {
 				btmrvl_send_module_cfg_cmd(card->priv,
 							MODULE_SHUTDOWN_REQ);
 				btmrvl_sdio_disable_host_int(card);
 			}
 			BT_DBG("unregester dev");
 			btmrvl_sdio_unregister_dev(card);
 			btmrvl_remove_card(card->priv);
 			kfree(card);
 		}
 	}
 }

 static struct sdio_driver bt_mrvl_sdio = {
 	.name		= "btmrvl_sdio",
 	.id_table	= btmrvl_sdio_ids,
 	.probe		= btmrvl_sdio_probe,
 	.remove		= btmrvl_sdio_remove,
 };

 static int btmrvl_sdio_init_module(void)
 {
 	if (sdio_register_driver(&bt_mrvl_sdio) != 0) {
 		BT_ERR("SDIO Driver Registration Failed");
 		return -ENODEV;
 	}

 	/* Clear the flag in case user removes the card. */
 	user_rmmod = 0;

 	return 0;
 }

 static void btmrvl_sdio_exit_module(void)
 {
 	/* Set the flag as user is removing this module. */
 	user_rmmod = 1;

 	sdio_unregister_driver(&bt_mrvl_sdio);
 }

 module_init(btmrvl_sdio_init_module);
 module_exit(btmrvl_sdio_exit_module);

 MODULE_AUTHOR("Marvell International Ltd.");
 MODULE_DESCRIPTION("Marvell BT-over-SDIO driver ver " VERSION);
 MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_FIRMWARE("sd8688_helper.bin");
 MODULE_FIRMWARE("sd8688.bin");
	/**
	* 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/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 */
	for (tries = 0; tries < pollnum; tries++) {
	if (btmrvl_sdio_read_fw_status(card, &firmwarestat) < 0)
	continue;

	if (firmwarestat == FIRMWARE_READY) {
	ret = 0;
	break;
	} else {
	msleep(10);
	}
	}

	return ret;
	}

	static int btmrvl_sdio_download_helper(struct btmrvl_sdio_card *card)
	{
	const struct firmware *fw_helper = NULL;
	const u8 *helper = NULL;
	int ret;
	void *tmphlprbuf = NULL;
	int tmphlprbufsz, hlprblknow, helperlen;
	u8 *helperbuf;
	u32 tx_len;

	ret = request_firmware(&fw_helper, card->helper,
	&card->func->dev);
	if ((ret < 0) \|\| !fw_helper) {
	BT_ERR("request_firmware(helper) failed, error code = %d",
	ret);
	ret = -ENOENT;
	goto done;
	}

	helper = fw_helper->data;
	helperlen = fw_helper->size;

	BT_DBG("Downloading helper image (%d bytes), block size %d bytes",
	helperlen, SDIO_BLOCK_SIZE);

	tmphlprbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);

	tmphlprbuf = kmalloc(tmphlprbufsz, GFP_KERNEL);
	if (!tmphlprbuf) {
	BT_ERR("Unable to allocate buffer for helper."
	" Terminating download");
	ret = -ENOMEM;
	goto done;
	}

	memset(tmphlprbuf, 0, tmphlprbufsz);

	helperbuf = (u8 *) ALIGN_ADDR(tmphlprbuf, BTSDIO_DMA_ALIGN);

	/* Perform helper data transfer */
	tx_len = (FIRMWARE_TRANSFER_NBLOCK * SDIO_BLOCK_SIZE)
	- SDIO_HEADER_LEN;
	hlprblknow = 0;

	do {
	ret = btmrvl_sdio_poll_card_status(card,
	CARD_IO_READY \| DN_LD_CARD_RDY);
	if (ret < 0) {
	BT_ERR("Helper download poll status timeout @ %d",
	hlprblknow);
	goto done;
	}

	/* Check if there is more data? */
	if (hlprblknow >= helperlen)
	break;

	if (helperlen - hlprblknow < tx_len)
	tx_len = helperlen - hlprblknow;

	/* Little-endian */
	helperbuf[0] = ((tx_len & 0x000000ff) >> 0);
	helperbuf[1] = ((tx_len & 0x0000ff00) >> 8);
	helperbuf[2] = ((tx_len & 0x00ff0000) >> 16);
	helperbuf[3] = ((tx_len & 0xff000000) >> 24);

	memcpy(&helperbuf[SDIO_HEADER_LEN], &helper[hlprblknow],
	tx_len);

	/* Now send the data */
	ret = sdio_writesb(card->func, card->ioport, helperbuf,
	FIRMWARE_TRANSFER_NBLOCK * SDIO_BLOCK_SIZE);
	if (ret < 0) {
	BT_ERR("IO error during helper download @ %d",
	hlprblknow);
	goto done;
	}

	hlprblknow += tx_len;
	} while (true);

	BT_DBG("Transferring helper image EOF block");

	memset(helperbuf, 0x0, SDIO_BLOCK_SIZE);

	ret = sdio_writesb(card->func, card->ioport, helperbuf,
	SDIO_BLOCK_SIZE);
	if (ret < 0) {
	BT_ERR("IO error in writing helper image EOF block");
	goto done;
	}

	ret = 0;

	done:
	kfree(tmphlprbuf);
	if (fw_helper)
	release_firmware(fw_helper);

	return ret;
	}

	static int btmrvl_sdio_download_fw_w_helper(struct btmrvl_sdio_card *card)
	{
	const struct firmware *fw_firmware = NULL;
	const u8 *firmware = NULL;
	int firmwarelen, tmpfwbufsz, ret;
	unsigned int tries, offset;
	u8 base0, base1;
	void *tmpfwbuf = NULL;
	u8 *fwbuf;
	u16 len;
	int txlen = 0, tx_blocks = 0, count = 0;

	ret = request_firmware(&fw_firmware, card->firmware,
	&card->func->dev);
	if ((ret < 0) \|\| !fw_firmware) {
	BT_ERR("request_firmware(firmware) failed, error code = %d",
	ret);
	ret = -ENOENT;
	goto done;
	}

	firmware = fw_firmware->data;
	firmwarelen = fw_firmware->size;

	BT_DBG("Downloading FW image (%d bytes)", firmwarelen);

	tmpfwbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);
	tmpfwbuf = kmalloc(tmpfwbufsz, GFP_KERNEL);
	if (!tmpfwbuf) {
	BT_ERR("Unable to allocate buffer for firmware."
	" Terminating download");
	ret = -ENOMEM;
	goto done;
	}

	memset(tmpfwbuf, 0, tmpfwbufsz);

	/* Ensure aligned firmware buffer */
	fwbuf = (u8 *) ALIGN_ADDR(tmpfwbuf, BTSDIO_DMA_ALIGN);

	/* Perform firmware data transfer */
	offset = 0;
	do {
	ret = btmrvl_sdio_poll_card_status(card,
	CARD_IO_READY \| DN_LD_CARD_RDY);
	if (ret < 0) {
	BT_ERR("FW download with helper poll status"
	" timeout @ %d", offset);
	goto done;
	}

	/* Check if there is more data ? */
	if (offset >= firmwarelen)
	break;

	for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
	base0 = sdio_readb(card->func,
	SQ_READ_BASE_ADDRESS_A0_REG, &ret);
	if (ret) {
	BT_ERR("BASE0 register read failed:"
	" base0 = 0x%04X(%d)."
	" Terminating download",
	base0, base0);
	ret = -EIO;
	goto done;
	}
	base1 = sdio_readb(card->func,
	SQ_READ_BASE_ADDRESS_A1_REG, &ret);
	if (ret) {
	BT_ERR("BASE1 register read failed:"
	" base1 = 0x%04X(%d)."
	" Terminating download",
	base1, base1);
	ret = -EIO;
	goto done;
	}

	len = (((u16) base1) << 8) \| base0;
	if (len)
	break;

	udelay(10);
	}

	if (!len)
	break;
	else if (len > BTM_UPLD_SIZE) {
	BT_ERR("FW download failure @%d, invalid length %d",
	offset, len);
	ret = -EINVAL;
	goto done;
	}

	txlen = len;

	if (len & BIT(0)) {
	count++;
	if (count > MAX_WRITE_IOMEM_RETRY) {
	BT_ERR("FW download failure @%d, "
	"over max retry count", offset);
	ret = -EIO;
	goto done;
	}
	BT_ERR("FW CRC error indicated by the helper: "
	"len = 0x%04X, txlen = %d", len, txlen);
	len &= ~BIT(0);
	/* Set txlen to 0 so as to resend from same offset */
	txlen = 0;
	} else {
	count = 0;

	/* Last block ? */
	if (firmwarelen - offset < txlen)
	txlen = firmwarelen - offset;

	tx_blocks =
	(txlen + SDIO_BLOCK_SIZE - 1) / SDIO_BLOCK_SIZE;

	memcpy(fwbuf, &firmware[offset], txlen);
	}

	ret = sdio_writesb(card->func, card->ioport, fwbuf,
	tx_blocks * SDIO_BLOCK_SIZE);

	if (ret < 0) {
	BT_ERR("FW download, writesb(%d) failed @%d",
	count, offset);
	sdio_writeb(card->func, HOST_CMD53_FIN, CONFIG_REG,
	&ret);
	if (ret)
	BT_ERR("writeb failed (CFG)");
	}

	offset += txlen;
	} while (true);

	BT_DBG("FW download over, size %d bytes", offset);

	ret = 0;

	done:
	kfree(tmpfwbuf);

	if (fw_firmware)
	release_firmware(fw_firmware);

	return ret;
	}

	static int btmrvl_sdio_card_to_host(struct btmrvl_private *priv)
	{
	u16 buf_len = 0;
	int ret, buf_block_len, blksz;
	struct sk_buff *skb = NULL;
	u32 type;
	u8 *payload = NULL;
	struct hci_dev *hdev = priv->btmrvl_dev.hcidev;
	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;

	if (!card \|\| !card->func) {
	BT_ERR("card or function is NULL!");
	ret = -EINVAL;
	goto exit;
	}

	/* Read the length of data to be transferred */
	ret = btmrvl_sdio_read_rx_len(card, &buf_len);
	if (ret < 0) {
	BT_ERR("read rx_len failed");
	ret = -EIO;
	goto exit;
	}

	blksz = SDIO_BLOCK_SIZE;
	buf_block_len = (buf_len + blksz - 1) / blksz;

	if (buf_len <= SDIO_HEADER_LEN
	\|\| (buf_block_len * blksz) > ALLOC_BUF_SIZE) {
	BT_ERR("invalid packet length: %d", buf_len);
	ret = -EINVAL;
	goto exit;
	}

	/* Allocate buffer */
	skb = bt_skb_alloc(buf_block_len * blksz + BTSDIO_DMA_ALIGN,
	GFP_ATOMIC);
	if (skb == NULL) {
	BT_ERR("No free skb");
	goto exit;
	}

	if ((unsigned long) skb->data & (BTSDIO_DMA_ALIGN - 1)) {
	skb_put(skb, (unsigned long) skb->data &
	(BTSDIO_DMA_ALIGN - 1));
	skb_pull(skb, (unsigned long) skb->data &
	(BTSDIO_DMA_ALIGN - 1));
	}

	payload = skb->data;

	ret = sdio_readsb(card->func, payload, card->ioport,
	buf_block_len * blksz);
	if (ret < 0) {
	BT_ERR("readsb failed: %d", ret);
	ret = -EIO;
	goto exit;
	}

	/* This is SDIO specific header length: byte[2][1][0], type: byte[3]
	* (HCI_COMMAND = 1, ACL_DATA = 2, SCO_DATA = 3, 0xFE = Vendor)
	*/

	buf_len = payload[0];
	buf_len \|= (u16) payload[1] << 8;
	type = payload[3];

	switch (type) {
	case HCI_ACLDATA_PKT:
	case HCI_SCODATA_PKT:
	case HCI_EVENT_PKT:
	bt_cb(skb)->pkt_type = type;
	skb->dev = (void *)hdev;
	skb_put(skb, buf_len);
	skb_pull(skb, SDIO_HEADER_LEN);

	if (type == HCI_EVENT_PKT)
	btmrvl_check_evtpkt(priv, skb);

	hci_recv_frame(skb);
	hdev->stat.byte_rx += buf_len;
	break;

	case MRVL_VENDOR_PKT:
	bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
	skb->dev = (void *)hdev;
	skb_put(skb, buf_len);
	skb_pull(skb, SDIO_HEADER_LEN);

	if (btmrvl_process_event(priv, skb))
	hci_recv_frame(skb);

	hdev->stat.byte_rx += buf_len;
	break;

	default:
	BT_ERR("Unknown packet type:%d", type);
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, payload,
	blksz * buf_block_len);

	kfree_skb(skb);
	skb = NULL;
	break;
	}

	exit:
	if (ret) {
	hdev->stat.err_rx++;
	if (skb)
	kfree_skb(skb);
	}

	return ret;
	}

	static int btmrvl_sdio_get_int_status(struct btmrvl_private priv, u8 ireg)
	{
	int ret;
	u8 sdio_ireg = 0;
	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;

	*ireg = 0;

	sdio_ireg = sdio_readb(card->func, HOST_INTSTATUS_REG, &ret);
	if (ret) {
	BT_ERR("sdio_readb: read int status register failed");
	ret = -EIO;
	goto done;
	}

	if (sdio_ireg != 0) {
	/*
	* DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
	* Clear the interrupt status register and re-enable the
	* interrupt.
	*/
	BT_DBG("sdio_ireg = 0x%x", sdio_ireg);

	sdio_writeb(card->func, ~(sdio_ireg) & (DN_LD_HOST_INT_STATUS \|
	UP_LD_HOST_INT_STATUS),
	HOST_INTSTATUS_REG, &ret);
	if (ret) {
	BT_ERR("sdio_writeb: clear int status register "
	"failed");
	ret = -EIO;
	goto done;
	}
	}

	if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
	if (priv->btmrvl_dev.tx_dnld_rdy)
	BT_DBG("tx_done already received: "
	" int_status=0x%x", sdio_ireg);
	else
	priv->btmrvl_dev.tx_dnld_rdy = true;
	}

	if (sdio_ireg & UP_LD_HOST_INT_STATUS)
	btmrvl_sdio_card_to_host(priv);

	*ireg = sdio_ireg;

	ret = 0;

	done:
	return ret;
	}

	static void btmrvl_sdio_interrupt(struct sdio_func *func)
	{
	struct btmrvl_private *priv;
	struct hci_dev *hcidev;
	struct btmrvl_sdio_card *card;
	u8 ireg = 0;

	card = sdio_get_drvdata(func);
	if (card && card->priv) {
	priv = card->priv;
	hcidev = priv->btmrvl_dev.hcidev;

	if (btmrvl_sdio_get_int_status(priv, &ireg))
	BT_ERR("reading HOST_INT_STATUS_REG failed");
	else
	BT_DBG("HOST_INT_STATUS_REG %#x", ireg);

	btmrvl_interrupt(priv);
	}
	}

	static int btmrvl_sdio_register_dev(struct btmrvl_sdio_card *card)
	{
	struct sdio_func *func;
	u8 reg;
	int ret = 0;

	if (!card \|\| !card->func) {
	BT_ERR("Error: card or function is NULL!");
	ret = -EINVAL;
	goto failed;
	}

	func = card->func;

	sdio_claim_host(func);

	ret = sdio_enable_func(func);
	if (ret) {
	BT_ERR("sdio_enable_func() failed: ret=%d", ret);
	ret = -EIO;
	goto release_host;
	}

	ret = sdio_claim_irq(func, btmrvl_sdio_interrupt);
	if (ret) {
	BT_ERR("sdio_claim_irq failed: ret=%d", ret);
	ret = -EIO;
	goto disable_func;
	}

	ret = sdio_set_block_size(card->func, SDIO_BLOCK_SIZE);
	if (ret) {
	BT_ERR("cannot set SDIO block size");
	ret = -EIO;
	goto release_irq;
	}

	reg = sdio_readb(func, IO_PORT_0_REG, &ret);
	if (ret < 0) {
	ret = -EIO;
	goto release_irq;
	}

	card->ioport = reg;

	reg = sdio_readb(func, IO_PORT_1_REG, &ret);
	if (ret < 0) {
	ret = -EIO;
	goto release_irq;
	}

	card->ioport \|= (reg << 8);

	reg = sdio_readb(func, IO_PORT_2_REG, &ret);
	if (ret < 0) {
	ret = -EIO;
	goto release_irq;
	}

	card->ioport \|= (reg << 16);

	BT_DBG("SDIO FUNC%d IO port: 0x%x", func->num, card->ioport);

	sdio_set_drvdata(func, card);

	sdio_release_host(func);

	return 0;

	release_irq:
	sdio_release_irq(func);

	disable_func:
	sdio_disable_func(func);

	release_host:
	sdio_release_host(func);

	failed:
	return ret;
	}

	static int btmrvl_sdio_unregister_dev(struct btmrvl_sdio_card *card)
	{
	if (card && card->func) {
	sdio_claim_host(card->func);
	sdio_release_irq(card->func);
	sdio_disable_func(card->func);
	sdio_release_host(card->func);
	sdio_set_drvdata(card->func, NULL);
	}

	return 0;
	}

	static int btmrvl_sdio_enable_host_int(struct btmrvl_sdio_card *card)
	{
	int ret;

	if (!card \|\| !card->func)
	return -EINVAL;

	sdio_claim_host(card->func);

	ret = btmrvl_sdio_enable_host_int_mask(card, HIM_ENABLE);

	btmrvl_sdio_get_rx_unit(card);

	sdio_release_host(card->func);

	return ret;
	}

	static int btmrvl_sdio_disable_host_int(struct btmrvl_sdio_card *card)
	{
	int ret;

	if (!card \|\| !card->func)
	return -EINVAL;

	sdio_claim_host(card->func);

	ret = btmrvl_sdio_disable_host_int_mask(card, HIM_DISABLE);

	sdio_release_host(card->func);

	return ret;
	}

	static int btmrvl_sdio_host_to_card(struct btmrvl_private *priv,
	u8 *payload, u16 nb)
	{
	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
	int ret = 0;
	int buf_block_len;
	int blksz;
	int i = 0;
	u8 *buf = NULL;
	void *tmpbuf = NULL;
	int tmpbufsz;

	if (!card \|\| !card->func) {
	BT_ERR("card or function is NULL!");
	return -EINVAL;
	}

	buf = payload;
	if ((unsigned long) payload & (BTSDIO_DMA_ALIGN - 1)) {
	tmpbufsz = ALIGN_SZ(nb, BTSDIO_DMA_ALIGN);
	tmpbuf = kzalloc(tmpbufsz, GFP_KERNEL);
	if (!tmpbuf)
	return -ENOMEM;
	buf = (u8 *) ALIGN_ADDR(tmpbuf, BTSDIO_DMA_ALIGN);
	memcpy(buf, payload, nb);
	}

	blksz = SDIO_BLOCK_SIZE;
	buf_block_len = (nb + blksz - 1) / blksz;

	sdio_claim_host(card->func);

	do {
	/* Transfer data to card */
	ret = sdio_writesb(card->func, card->ioport, buf,
	buf_block_len * blksz);
	if (ret < 0) {
	i++;
	BT_ERR("i=%d writesb failed: %d", i, ret);
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
	payload, nb);
	ret = -EIO;
	if (i > MAX_WRITE_IOMEM_RETRY)
	goto exit;
	}
	} while (ret);

	priv->btmrvl_dev.tx_dnld_rdy = false;

	exit:
	sdio_release_host(card->func);

	return ret;
	}

	static int btmrvl_sdio_download_fw(struct btmrvl_sdio_card *card)
	{
	int ret = 0;

	if (!card \|\| !card->func) {
	BT_ERR("card or function is NULL!");
	return -EINVAL;
	}
	sdio_claim_host(card->func);

	if (!btmrvl_sdio_verify_fw_download(card, 1)) {
	BT_DBG("Firmware already downloaded!");
	goto done;
	}

	ret = btmrvl_sdio_download_helper(card);
	if (ret) {
	BT_ERR("Failed to download helper!");
	ret = -EIO;
	goto done;
	}

	if (btmrvl_sdio_download_fw_w_helper(card)) {
	BT_ERR("Failed to download firmware!");
	ret = -EIO;
	goto done;
	}

	if (btmrvl_sdio_verify_fw_download(card, MAX_POLL_TRIES)) {
	BT_ERR("FW failed to be active in time!");
	ret = -ETIMEDOUT;
	goto done;
	}

	done:
	sdio_release_host(card->func);

	return ret;
	}

	static int btmrvl_sdio_wakeup_fw(struct btmrvl_private *priv)
	{
	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
	int ret = 0;

	if (!card \|\| !card->func) {
	BT_ERR("card or function is NULL!");
	return -EINVAL;
	}

	sdio_claim_host(card->func);

	sdio_writeb(card->func, HOST_POWER_UP, CONFIG_REG, &ret);

	sdio_release_host(card->func);

	BT_DBG("wake up firmware");

	return ret;
	}

	static int btmrvl_sdio_probe(struct sdio_func *func,
	const struct sdio_device_id *id)
	{
	int ret = 0;
	struct btmrvl_private *priv = NULL;
	struct btmrvl_sdio_card *card = NULL;

	BT_INFO("vendor=0x%x, device=0x%x, class=%d, fn=%d",
	id->vendor, id->device, id->class, func->num);

	card = kzalloc(sizeof(*card), GFP_KERNEL);
	if (!card) {
	ret = -ENOMEM;
	goto done;
	}

	card->func = func;

	if (id->driver_data) {
	struct btmrvl_sdio_device data = (void ) id->driver_data;
	card->helper = data->helper;
	card->firmware = data->firmware;
	}

	if (btmrvl_sdio_register_dev(card) < 0) {
	BT_ERR("Failed to register BT device!");
	ret = -ENODEV;
	goto free_card;
	}

	/* Disable the interrupts on the card */
	btmrvl_sdio_disable_host_int(card);

	if (btmrvl_sdio_download_fw(card)) {
	BT_ERR("Downloading firmware failed!");
	ret = -ENODEV;
	goto unreg_dev;
	}

	msleep(100);

	btmrvl_sdio_enable_host_int(card);

	priv = btmrvl_add_card(card);
	if (!priv) {
	BT_ERR("Initializing card failed!");
	ret = -ENODEV;
	goto disable_host_int;
	}

	card->priv = priv;

	/* Initialize the interface specific function pointers */
	priv->hw_host_to_card = btmrvl_sdio_host_to_card;
	priv->hw_wakeup_firmware = btmrvl_sdio_wakeup_fw;

	btmrvl_send_module_cfg_cmd(priv, MODULE_BRINGUP_REQ);
	priv->btmrvl_dev.psmode = 1;
	btmrvl_enable_ps(priv);

	return 0;

	disable_host_int:
	btmrvl_sdio_disable_host_int(card);
	unreg_dev:
	btmrvl_sdio_unregister_dev(card);
	free_card:
	kfree(card);
	done:
	return ret;
	}

	static void btmrvl_sdio_remove(struct sdio_func *func)
	{
	struct btmrvl_sdio_card *card;

	if (func) {
	card = sdio_get_drvdata(func);
	if (card) {
	/* Send SHUTDOWN command & disable interrupt
	* if user removes the module.
	*/
	if (user_rmmod) {
	btmrvl_send_module_cfg_cmd(card->priv,
	MODULE_SHUTDOWN_REQ);
	btmrvl_sdio_disable_host_int(card);
	}
	BT_DBG("unregester dev");
	btmrvl_sdio_unregister_dev(card);
	btmrvl_remove_card(card->priv);
	kfree(card);
	}
	}
	}

	static struct sdio_driver bt_mrvl_sdio = {
	.name = "btmrvl_sdio",
	.id_table = btmrvl_sdio_ids,
	.probe = btmrvl_sdio_probe,
	.remove = btmrvl_sdio_remove,
	};

	static int btmrvl_sdio_init_module(void)
	{
	if (sdio_register_driver(&bt_mrvl_sdio) != 0) {
	BT_ERR("SDIO Driver Registration Failed");
	return -ENODEV;
	}

	/* Clear the flag in case user removes the card. */
	user_rmmod = 0;

	return 0;
	}

	static void btmrvl_sdio_exit_module(void)
	{
	/* Set the flag as user is removing this module. */
	user_rmmod = 1;

	sdio_unregister_driver(&bt_mrvl_sdio);
	}

	module_init(btmrvl_sdio_init_module);
	module_exit(btmrvl_sdio_exit_module);

	MODULE_AUTHOR("Marvell International Ltd.");
	MODULE_DESCRIPTION("Marvell BT-over-SDIO driver ver " VERSION);
	MODULE_VERSION(VERSION);
	MODULE_LICENSE("GPL v2");
	MODULE_FIRMWARE("sd8688_helper.bin");
	MODULE_FIRMWARE("sd8688.bin");