Bluetooth: Add Marvell BT-over-SDIO driver

This driver supports Marvell Bluetooth enabled devices with SDIO
interface. Currently only SD8688 chip is supported.

The helper/firmware images of SD8688 can be downloaded from this tree:
git://git.infradead.org/users/dwmw2/linux-firmware.git

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.

Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 1128 insertions, 0 deletions

diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
new file mode 100644
index 000000000000..8f13e7bea0ba
--- /dev/null
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -0,0 +1,1128 @@
+/**
+ * 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"
+
+#ifndef SDIO_DEVICE_ID_MARVELL_8688BT
+#define SDIO_DEVICE_ID_MARVELL_8688BT           0x9105
+#endif
+
+/* 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 sdio_device_id btmrvl_sdio_ids[] = {
+        {SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8688BT)},
+        {0, 0, 0, 0}
+};
+
+MODULE_DEVICE_TABLE(sdio, btmrvl_sdio_ids);
+
+static struct btmrvl_sdio_device btmrvl_sdio_devices[] = {
+        {
+                .dev_id = SDIO_DEVICE_ID_MARVELL_8688BT,
+                .helper = "sd8688_helper.bin",
+                .firmware = "sd8688.bin",
+        },
+};
+
+static int btmrvl_sdio_get_rx_unit(struct btmrvl_sdio_card *card)
+{
+        u8 reg;
+        int ret;
+
+        BT_DBG("Enter");
+
+        reg = sdio_readb(card->func, CARD_RX_UNIT_REG, &ret);
+        if (!ret)
+                card->rx_unit = reg;
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_read_fw_status(struct btmrvl_sdio_card *card, u16 *dat)
+{
+        int ret;
+        u8 fws0, fws1;
+
+        BT_DBG("Enter");
+
+        *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) {
+                BT_DBG("Leave");
+                return -EIO;
+        }
+
+        *dat = (((u16) fws1) << 8) | fws0;
+
+        BT_DBG("Leave");
+
+        return 0;
+}
+
+static int btmrvl_sdio_read_rx_len(struct btmrvl_sdio_card *card, u16 *dat)
+{
+        int ret;
+        u8 reg;
+
+        BT_DBG("Enter");
+
+        reg = sdio_readb(card->func, CARD_RX_LEN_REG, &ret);
+        if (!ret)
+                *dat = (u16) reg << card->rx_unit;
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_enable_host_int_mask(struct btmrvl_sdio_card *card,
+                                                u8 mask)
+{
+        int ret;
+
+        BT_DBG("Enter");
+
+        sdio_writeb(card->func, mask, HOST_INT_MASK_REG, &ret);
+        if (ret) {
+                BT_ERR("Unable to enable the host interrupt!");
+                ret = -EIO;
+        }
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_disable_host_int_mask(struct btmrvl_sdio_card *card,
+                                                u8 mask)
+{
+        int ret;
+        u8 host_int_mask;
+
+        BT_DBG("Enter");
+
+        host_int_mask = sdio_readb(card->func, HOST_INT_MASK_REG, &ret);
+        if (ret) {
+                ret = -EIO;
+                goto done;
+        }
+
+        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!");
+                ret = -EIO;
+                goto done;
+        }
+
+        ret = 0;
+
+done:
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_poll_card_status(struct btmrvl_sdio_card *card, u8 bits)
+{
+        unsigned int tries;
+        int ret;
+        u8 status;
+
+        BT_DBG("Enter");
+
+        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)
+                        goto done;
+
+                udelay(1);
+        }
+
+        ret = -ETIMEDOUT;
+
+failed:
+        BT_ERR("FAILED! ret=%d", ret);
+
+done:
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_verify_fw_download(struct btmrvl_sdio_card *card,
+                                                int pollnum)
+{
+        int ret = -ETIMEDOUT;
+        u16 firmwarestat;
+        unsigned int tries;
+
+        BT_DBG("Enter");
+
+         /* 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);
+                }
+        }
+
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        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);
+
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        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);
+
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        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 ((u32) skb->data & (BTSDIO_DMA_ALIGN - 1)) {
+                skb_put(skb, (u32) skb->data & (BTSDIO_DMA_ALIGN - 1));
+                skb_pull(skb, (u32) skb->data & (BTSDIO_DMA_ALIGN - 1));
+        }
+
+        payload = skb->tail;
+
+        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("Unknow 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);
+        }
+
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        *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:
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        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);
+        }
+
+        BT_DBG("Leave");
+}
+
+static int btmrvl_sdio_register_dev(struct btmrvl_sdio_card *card)
+{
+        int ret = 0, i;
+        u8 reg;
+        struct sdio_func *func;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_ERR("Error: card or function is NULL!");
+                ret = -EINVAL;
+                goto failed;
+        }
+
+        func = card->func;
+
+        for (i = 0; i < ARRAY_SIZE(btmrvl_sdio_devices); i++) {
+                if (func->device == btmrvl_sdio_devices[i].dev_id)
+                        break;
+        }
+
+        if (i == ARRAY_SIZE(btmrvl_sdio_devices)) {
+                BT_ERR("Error: unknown device id 0x%x", func->device);
+                ret = -EINVAL;
+                goto failed;
+        }
+
+        card->helper = btmrvl_sdio_devices[i].helper;
+        card->firmware = btmrvl_sdio_devices[i].firmware;
+
+        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);
+
+        BT_DBG("Leave");
+        return 0;
+
+release_irq:
+        sdio_release_irq(func);
+
+disable_func:
+        sdio_disable_func(func);
+
+release_host:
+        sdio_release_host(func);
+
+failed:
+        BT_DBG("Leave");
+        return ret;
+}
+
+static int btmrvl_sdio_unregister_dev(struct btmrvl_sdio_card *card)
+{
+        BT_DBG("Enter");
+
+        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);
+        }
+
+        BT_DBG("Leave");
+
+        return 0;
+}
+
+static int btmrvl_sdio_enable_host_int(struct btmrvl_sdio_card *card)
+{
+        int ret;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_DBG("Leave");
+                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);
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_disable_host_int(struct btmrvl_sdio_card *card)
+{
+        int ret;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_DBG("Leave");
+                return -EINVAL;
+        }
+
+        sdio_claim_host(card->func);
+
+        ret = btmrvl_sdio_disable_host_int_mask(card, HIM_DISABLE);
+
+        sdio_release_host(card->func);
+
+        BT_DBG("Leave");
+
+        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;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_ERR("card or function is NULL!");
+                BT_DBG("Leave");
+                return -EINVAL;
+        }
+
+        buf = payload;
+        if ((u32) payload & (BTSDIO_DMA_ALIGN - 1)) {
+                tmpbufsz = ALIGN_SZ(nb, BTSDIO_DMA_ALIGN);
+                tmpbuf = kmalloc(tmpbufsz, GFP_KERNEL);
+                memset(tmpbuf, 0, tmpbufsz);
+                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);
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_download_fw(struct btmrvl_sdio_card *card)
+{
+        int ret = 0;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_ERR("card or function is NULL!");
+                BT_DBG("Leave");
+                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);
+
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static int btmrvl_sdio_wakeup_fw(struct btmrvl_private *priv)
+{
+        struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
+        int ret = 0;
+
+        BT_DBG("Enter");
+
+        if (!card || !card->func) {
+                BT_ERR("card or function is NULL!");
+                BT_DBG("Leave");
+                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");
+
+        BT_DBG("Leave");
+
+        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_DBG("Enter");
+
+        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 (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;
+
+        strncpy(priv->btmrvl_dev.name, "btmrvl_sdio0",
+                        sizeof(priv->btmrvl_dev.name));
+
+        btmrvl_send_module_cfg_cmd(priv, MODULE_BRINGUP_REQ);
+
+        BT_DBG("Leave");
+
+        return 0;
+
+disable_host_int:
+        btmrvl_sdio_disable_host_int(card);
+unreg_dev:
+        btmrvl_sdio_unregister_dev(card);
+free_card:
+        kfree(card);
+done:
+        BT_DBG("Leave");
+
+        return ret;
+}
+
+static void btmrvl_sdio_remove(struct sdio_func *func)
+{
+        struct btmrvl_sdio_card *card;
+
+        BT_DBG("Enter");
+
+        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);
+                }
+        }
+
+        BT_DBG("Leave");
+}
+
+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)
+{
+        BT_DBG("Enter");
+
+        if (sdio_register_driver(&bt_mrvl_sdio) != 0) {
+                BT_ERR("SDIO Driver Registration Failed");
+                BT_DBG("Leave");
+                return -ENODEV;
+        }
+
+        /* Clear the flag in case user removes the card. */
+        user_rmmod = 0;
+
+        BT_DBG("Leave");
+
+        return 0;
+}
+
+static void btmrvl_sdio_exit_module(void)
+{
+        BT_DBG("Enter");
+
+        /* Set the flag as user is removing this module. */
+        user_rmmod = 1;
+
+        sdio_unregister_driver(&bt_mrvl_sdio);
+
+        BT_DBG("Leave");
+}
+
+module_init(btmrvl_sdio_init_module);
+module_exit(btmrvl_sdio_exit_module);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION("Marvell BT-over-SDIO Driver v" VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL v2");