/*
 * Copyright (c) 2004-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/module.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sd.h>
#include "hif.h"
#include "hif-ops.h"
#include "target.h"
#include "debug.h"
#include "cfg80211.h"

struct ath6kl_sdio {
        struct sdio_func *func;

        /* protects access to bus_req_freeq */
        spinlock_t lock;

        /* free list */
        struct list_head bus_req_freeq;

        /* available bus requests */
        struct bus_request bus_req[BUS_REQUEST_MAX_NUM];

        struct ath6kl *ar;

        u8 *dma_buffer;

        /* protects access to dma_buffer */
        struct mutex dma_buffer_mutex;

        /* scatter request list head */
        struct list_head scat_req;

        atomic_t irq_handling;
        wait_queue_head_t irq_wq;

        /* protects access to scat_req */
        spinlock_t scat_lock;

        bool scatter_enabled;

        bool is_disabled;
        const struct sdio_device_id *id;
        struct work_struct wr_async_work;
        struct list_head wr_asyncq;

        /* protects access to wr_asyncq */
        spinlock_t wr_async_lock;
};

#define CMD53_ARG_READ          0
#define CMD53_ARG_WRITE         1
#define CMD53_ARG_BLOCK_BASIS   1
#define CMD53_ARG_FIXED_ADDRESS 0
#define CMD53_ARG_INCR_ADDRESS  1

static inline struct ath6kl_sdio *ath6kl_sdio_priv(struct ath6kl *ar)
{
        return ar->hif_priv;
}

/*
 * Macro to check if DMA buffer is WORD-aligned and DMA-able.
 * Most host controllers assume the buffer is DMA'able and will
 * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid
 * check fails on stack memory.
 */
static inline bool buf_needs_bounce(u8 *buf)
{
        return ((unsigned long) buf & 0x3) || !virt_addr_valid(buf);
}

static void ath6kl_sdio_set_mbox_info(struct ath6kl *ar)
{
        struct ath6kl_mbox_info *mbox_info = &ar->mbox_info;

        /* EP1 has an extended range */
        mbox_info->htc_addr = HIF_MBOX_BASE_ADDR;
        mbox_info->htc_ext_addr = HIF_MBOX0_EXT_BASE_ADDR;
        mbox_info->htc_ext_sz = HIF_MBOX0_EXT_WIDTH;
        mbox_info->block_size = HIF_MBOX_BLOCK_SIZE;
        mbox_info->gmbox_addr = HIF_GMBOX_BASE_ADDR;
        mbox_info->gmbox_sz = HIF_GMBOX_WIDTH;
}

static inline void ath6kl_sdio_set_cmd53_arg(u32 *arg, u8 rw, u8 func,
                                             u8 mode, u8 opcode, u32 addr,
                                             u16 blksz)
{
        *arg = (((rw & 1) << 31) |
                ((func & 0x7) << 28) |
                ((mode & 1) << 27) |
                ((opcode & 1) << 26) |
                ((addr & 0x1FFFF) << 9) |
                (blksz & 0x1FF));
}

static inline void ath6kl_sdio_set_cmd52_arg(u32 *arg, u8 write, u8 raw,
                                             unsigned int address,
                                             unsigned char val)
{
        const u8 func = 0;

        *arg = ((write & 1) << 31) |
               ((func & 0x7) << 28) |
               ((raw & 1) << 27) |
               (1 << 26) |
               ((address & 0x1FFFF) << 9) |
               (1 << 8) |
               (val & 0xFF);
}

static int ath6kl_sdio_func0_cmd52_wr_byte(struct mmc_card *card,
                                           unsigned int address,
                                           unsigned char byte)
{
        struct mmc_command io_cmd;

        memset(&io_cmd, 0, sizeof(io_cmd));
        ath6kl_sdio_set_cmd52_arg(&io_cmd.arg, 1, 0, address, byte);
        io_cmd.opcode = SD_IO_RW_DIRECT;
        io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

        return mmc_wait_for_cmd(card->host, &io_cmd, 0);
}

static int ath6kl_sdio_io(struct sdio_func *func, u32 request, u32 addr,
                          u8 *buf, u32 len)
{
        int ret = 0;

        sdio_claim_host(func);

        if (request & HIF_WRITE) {
                /* FIXME: looks like ugly workaround for something */
                if (addr >= HIF_MBOX_BASE_ADDR &&
                    addr <= HIF_MBOX_END_ADDR)
                        addr += (HIF_MBOX_WIDTH - len);

                /* FIXME: this also looks like ugly workaround */
                if (addr == HIF_MBOX0_EXT_BASE_ADDR)
                        addr += HIF_MBOX0_EXT_WIDTH - len;

                if (request & HIF_FIXED_ADDRESS)
                        ret = sdio_writesb(func, addr, buf, len);
                else
                        ret = sdio_memcpy_toio(func, addr, buf, len);
        } else {
                if (request & HIF_FIXED_ADDRESS)
                        ret = sdio_readsb(func, buf, addr, len);
                else
                        ret = sdio_memcpy_fromio(func, buf, addr, len);
        }

        sdio_release_host(func);

        ath6kl_dbg(ATH6KL_DBG_SDIO, "%s addr 0x%x%s buf 0x%p len %d\n",
                   request & HIF_WRITE ? "wr" : "rd", addr,
                   request & HIF_FIXED_ADDRESS ? " (fixed)" : "", buf, len);
        ath6kl_dbg_dump(ATH6KL_DBG_SDIO_DUMP, NULL, "sdio ", buf, len);

        return ret;
}

static struct bus_request *ath6kl_sdio_alloc_busreq(struct ath6kl_sdio *ar_sdio)
{
        struct bus_request *bus_req;

        spin_lock_bh(&ar_sdio->lock);

        if (list_empty(&ar_sdio->bus_req_freeq)) {
                spin_unlock_bh(&ar_sdio->lock);
                return NULL;
        }

        bus_req = list_first_entry(&ar_sdio->bus_req_freeq,
                                   struct bus_request, list);
        list_del(&bus_req->list);

        spin_unlock_bh(&ar_sdio->lock);
        ath6kl_dbg(ATH6KL_DBG_SCATTER, "%s: bus request 0x%p\n",
                   __func__, bus_req);

        return bus_req;
}

static void ath6kl_sdio_free_bus_req(struct ath6kl_sdio *ar_sdio,
                                     struct bus_request *bus_req)
{
        ath6kl_dbg(ATH6KL_DBG_SCATTER, "%s: bus request 0x%p\n",
                   __func__, bus_req);

        spin_lock_bh(&ar_sdio->lock);
        list_add_tail(&bus_req->list, &ar_sdio->bus_req_freeq);
        spin_unlock_bh(&ar_sdio->lock);
}

static void ath6kl_sdio_setup_scat_data(struct hif_scatter_req *scat_req,
                                        struct mmc_data *data)
{
        struct scatterlist *sg;
        int i;

        data->blksz = HIF_MBOX_BLOCK_SIZE;
        data->blocks = scat_req->len / HIF_MBOX_BLOCK_SIZE;

        ath6kl_dbg(ATH6KL_DBG_SCATTER,
                   "hif-scatter: (%s) addr: 0x%X, (block len: %d, block count: %d) , (tot:%d,sg:%d)\n",
                   (scat_req->req & HIF_WRITE) ? "WR" : "RD", scat_req->addr,
                   data->blksz, data->blocks, scat_req->len,
                   scat_req->scat_entries);

        data->flags = (scat_req->req & HIF_WRITE) ? MMC_DATA_WRITE :
                                                    MMC_DATA_READ;

        /* fill SG entries */
        sg = scat_req->sgentries;
        sg_init_table(sg, scat_req->scat_entries);

        /* assemble SG list */
        for (i = 0; i < scat_req->scat_entries; i++, sg++) {
                ath6kl_dbg(ATH6KL_DBG_SCATTER, "%d: addr:0x%p, len:%d\n",
                           i, scat_req->scat_list[i].buf,
                           scat_req->scat_list[i].len);

                sg_set_buf(sg, scat_req->scat_list[i].buf,
                           scat_req->scat_list[i].len);
        }

        /* set scatter-gather table for request */
        data->sg = scat_req->sgentries;
        data->sg_len = scat_req->scat_entries;
}

static int ath6kl_sdio_scat_rw(struct ath6kl_sdio *ar_sdio,
                               struct bus_request *req)
{
        struct mmc_request mmc_req;
        struct mmc_command cmd;
        struct mmc_data data;
        struct hif_scatter_req *scat_req;
        u8 opcode, rw;
        int status, len;

        scat_req = req->scat_req;

        if (scat_req->virt_scat) {
                len = scat_req->len;
                if (scat_req->req & HIF_BLOCK_BASIS)
                        len = round_down(len, HIF_MBOX_BLOCK_SIZE);

                status = ath6kl_sdio_io(ar_sdio->func, scat_req->req,
                                        scat_req->addr, scat_req->virt_dma_buf,
                                        len);
                goto scat_complete;
        }

        memset(&mmc_req, 0, sizeof(struct mmc_request));
        memset(&cmd, 0, sizeof(struct mmc_command));
        memset(&data, 0, sizeof(struct mmc_data));

        ath6kl_sdio_setup_scat_data(scat_req, &data);

        opcode = (scat_req->req & HIF_FIXED_ADDRESS) ?
                  CMD53_ARG_FIXED_ADDRESS : CMD53_ARG_INCR_ADDRESS;

        rw = (scat_req->req & HIF_WRITE) ? CMD53_ARG_WRITE : CMD53_ARG_READ;

        /* Fixup the address so that the last byte will fall on MBOX EOM */
        if (scat_req->req & HIF_WRITE) {
                if (scat_req->addr == HIF_MBOX_BASE_ADDR)
                        scat_req->addr += HIF_MBOX_WIDTH - scat_req->len;
                else
                        /* Uses extended address range */
                        scat_req->addr += HIF_MBOX0_EXT_WIDTH - scat_req->len;
        }

        /* set command argument */
        ath6kl_sdio_set_cmd53_arg(&cmd.arg, rw, ar_sdio->func->num,
                                  CMD53_ARG_BLOCK_BASIS, opcode, scat_req->addr,
                                  data.blocks);

        cmd.opcode = SD_IO_RW_EXTENDED;
        cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;

        mmc_req.cmd = &cmd;
        mmc_req.data = &data;

        sdio_claim_host(ar_sdio->func);

        mmc_set_data_timeout(&data, ar_sdio->func->card);
        /* synchronous call to process request */
        mmc_wait_for_req(ar_sdio->func->card->host, &mmc_req);

        sdio_release_host(ar_sdio->func);

        status = cmd.error ? cmd.error : data.error;

scat_complete:
        scat_req->status = status;

        if (scat_req->status)
                ath6kl_err("Scatter write request failed:%d\n",
                           scat_req->status);

        if (scat_req->req & HIF_ASYNCHRONOUS)
                scat_req->complete(ar_sdio->ar->htc_target, scat_req);

        return status;
}

static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
                                           int n_scat_entry, int n_scat_req,
                                           bool virt_scat)
{
        struct hif_scatter_req *s_req;
        struct bus_request *bus_req;
        int i, scat_req_sz, scat_list_sz, sg_sz, buf_sz;
        u8 *virt_buf;

        scat_list_sz = (n_scat_entry - 1) * sizeof(struct hif_scatter_item);
        scat_req_sz = sizeof(*s_req) + scat_list_sz;

        if (!virt_scat)
                sg_sz = sizeof(struct scatterlist) * n_scat_entry;
        else
                buf_sz =  2 * L1_CACHE_BYTES +
                          ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;

        for (i = 0; i < n_scat_req; i++) {
                /* allocate the scatter request */
                s_req = kzalloc(scat_req_sz, GFP_KERNEL);
                if (!s_req)
                        return -ENOMEM;

                if (virt_scat) {
                        virt_buf = kzalloc(buf_sz, GFP_KERNEL);
                        if (!virt_buf) {
                                kfree(s_req);
                                return -ENOMEM;
                        }

                        s_req->virt_dma_buf =
                                (u8 *)L1_CACHE_ALIGN((unsigned long)virt_buf);
                } else {
                        /* allocate sglist */
                        s_req->sgentries = kzalloc(sg_sz, GFP_KERNEL);

                        if (!s_req->sgentries) {
                                kfree(s_req);
                                return -ENOMEM;
                        }
                }

                /* allocate a bus request for this scatter request */
                bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);
                if (!bus_req) {
                        kfree(s_req->sgentries);
                        kfree(s_req->virt_dma_buf);
                        kfree(s_req);
                        return -ENOMEM;
                }

                /* assign the scatter request to this bus request */
                bus_req->scat_req = s_req;
                s_req->busrequest = bus_req;

                s_req->virt_scat = virt_scat;

                /* add it to the scatter pool */
                hif_scatter_req_add(ar_sdio->ar, s_req);
        }

        return 0;
}

static int ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
                                       u32 len, u32 request)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        u8  *tbuf = NULL;
        int ret;
        bool bounced = false;

        if (request & HIF_BLOCK_BASIS)
                len = round_down(len, HIF_MBOX_BLOCK_SIZE);

        if (buf_needs_bounce(buf)) {
                if (!ar_sdio->dma_buffer)
                        return -ENOMEM;
                mutex_lock(&ar_sdio->dma_buffer_mutex);
                tbuf = ar_sdio->dma_buffer;

                if (request & HIF_WRITE)
                        memcpy(tbuf, buf, len);

                bounced = true;
        } else
                tbuf = buf;

        ret = ath6kl_sdio_io(ar_sdio->func, request, addr, tbuf, len);
        if ((request & HIF_READ) && bounced)
                memcpy(buf, tbuf, len);

        if (bounced)
                mutex_unlock(&ar_sdio->dma_buffer_mutex);

        return ret;
}

static void __ath6kl_sdio_write_async(struct ath6kl_sdio *ar_sdio,
                                      struct bus_request *req)
{
        if (req->scat_req)
                ath6kl_sdio_scat_rw(ar_sdio, req);
        else {
                void *context;
                int status;

                status = ath6kl_sdio_read_write_sync(ar_sdio->ar, req->address,
                                                     req->buffer, req->length,
                                                     req->request);
                context = req->packet;
                ath6kl_sdio_free_bus_req(ar_sdio, req);
                ath6kl_hif_rw_comp_handler(context, status);
        }
}

static void ath6kl_sdio_write_async_work(struct work_struct *work)
{
        struct ath6kl_sdio *ar_sdio;
        struct bus_request *req, *tmp_req;

        ar_sdio = container_of(work, struct ath6kl_sdio, wr_async_work);

        spin_lock_bh(&ar_sdio->wr_async_lock);
        list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) {
                list_del(&req->list);
                spin_unlock_bh(&ar_sdio->wr_async_lock);
                __ath6kl_sdio_write_async(ar_sdio, req);
                spin_lock_bh(&ar_sdio->wr_async_lock);
        }
        spin_unlock_bh(&ar_sdio->wr_async_lock);
}

static void ath6kl_sdio_irq_handler(struct sdio_func *func)
{
        int status;
        struct ath6kl_sdio *ar_sdio;

        ath6kl_dbg(ATH6KL_DBG_SDIO, "irq\n");

        ar_sdio = sdio_get_drvdata(func);
        atomic_set(&ar_sdio->irq_handling, 1);
        /*
         * Release the host during interrups so we can pick it back up when
         * we process commands.
         */
        sdio_release_host(ar_sdio->func);

        status = ath6kl_hif_intr_bh_handler(ar_sdio->ar);
        sdio_claim_host(ar_sdio->func);

        atomic_set(&ar_sdio->irq_handling, 0);
        wake_up(&ar_sdio->irq_wq);

        WARN_ON(status && status != -ECANCELED);
}

static int ath6kl_sdio_power_on(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct sdio_func *func = ar_sdio->func;
        int ret = 0;

        if (!ar_sdio->is_disabled)
                return 0;

        ath6kl_dbg(ATH6KL_DBG_BOOT, "sdio power on\n");

        sdio_claim_host(func);

        ret = sdio_enable_func(func);
        if (ret) {
                ath6kl_err("Unable to enable sdio func: %d)\n", ret);
                sdio_release_host(func);
                return ret;
        }

        sdio_release_host(func);

        /*
         * Wait for hardware to initialise. It should take a lot less than
         * 10 ms but let's be conservative here.
         */
        msleep(10);

        ar_sdio->is_disabled = false;

        return ret;
}

static int ath6kl_sdio_power_off(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        int ret;

        if (ar_sdio->is_disabled)
                return 0;

        ath6kl_dbg(ATH6KL_DBG_BOOT, "sdio power off\n");

        /* Disable the card */
        sdio_claim_host(ar_sdio->func);
        ret = sdio_disable_func(ar_sdio->func);
        sdio_release_host(ar_sdio->func);

        if (ret)
                return ret;

        ar_sdio->is_disabled = true;

        return ret;
}

static int ath6kl_sdio_write_async(struct ath6kl *ar, u32 address, u8 *buffer,
                                   u32 length, u32 request,
                                   struct htc_packet *packet)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct bus_request *bus_req;

        bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);

        if (!bus_req)
                return -ENOMEM;

        bus_req->address = address;
        bus_req->buffer = buffer;
        bus_req->length = length;
        bus_req->request = request;
        bus_req->packet = packet;

        spin_lock_bh(&ar_sdio->wr_async_lock);
        list_add_tail(&bus_req->list, &ar_sdio->wr_asyncq);
        spin_unlock_bh(&ar_sdio->wr_async_lock);
        queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);

        return 0;
}

static void ath6kl_sdio_irq_enable(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        int ret;

        sdio_claim_host(ar_sdio->func);

        /* Register the isr */
        ret =  sdio_claim_irq(ar_sdio->func, ath6kl_sdio_irq_handler);
        if (ret)
                ath6kl_err("Failed to claim sdio irq: %d\n", ret);

        sdio_release_host(ar_sdio->func);
}

static bool ath6kl_sdio_is_on_irq(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);

        return !atomic_read(&ar_sdio->irq_handling);
}

static void ath6kl_sdio_irq_disable(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        int ret;

        sdio_claim_host(ar_sdio->func);

        if (atomic_read(&ar_sdio->irq_handling)) {
                sdio_release_host(ar_sdio->func);

                ret = wait_event_interruptible(ar_sdio->irq_wq,
                                               ath6kl_sdio_is_on_irq(ar));
                if (ret)
                        return;

                sdio_claim_host(ar_sdio->func);
        }

        ret = sdio_release_irq(ar_sdio->func);
        if (ret)
                ath6kl_err("Failed to release sdio irq: %d\n", ret);

        sdio_release_host(ar_sdio->func);
}

static struct hif_scatter_req *ath6kl_sdio_scatter_req_get(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct hif_scatter_req *node = NULL;

        spin_lock_bh(&ar_sdio->scat_lock);

        if (!list_empty(&ar_sdio->scat_req)) {
                node = list_first_entry(&ar_sdio->scat_req,
                                        struct hif_scatter_req, list);
                list_del(&node->list);

                node->scat_q_depth = get_queue_depth(&ar_sdio->scat_req);
        }

        spin_unlock_bh(&ar_sdio->scat_lock);

        return node;
}

static void ath6kl_sdio_scatter_req_add(struct ath6kl *ar,
                                        struct hif_scatter_req *s_req)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);

        spin_lock_bh(&ar_sdio->scat_lock);

        list_add_tail(&s_req->list, &ar_sdio->scat_req);

        spin_unlock_bh(&ar_sdio->scat_lock);

}

/* scatter gather read write request */
static int ath6kl_sdio_async_rw_scatter(struct ath6kl *ar,
                                        struct hif_scatter_req *scat_req)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        u32 request = scat_req->req;
        int status = 0;

        if (!scat_req->len)
                return -EINVAL;

        ath6kl_dbg(ATH6KL_DBG_SCATTER,
                   "hif-scatter: total len: %d scatter entries: %d\n",
                   scat_req->len, scat_req->scat_entries);

        if (request & HIF_SYNCHRONOUS)
                status = ath6kl_sdio_scat_rw(ar_sdio, scat_req->busrequest);
        else {
                spin_lock_bh(&ar_sdio->wr_async_lock);
                list_add_tail(&scat_req->busrequest->list, &ar_sdio->wr_asyncq);
                spin_unlock_bh(&ar_sdio->wr_async_lock);
                queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);
        }

        return status;
}

/* clean up scatter support */
static void ath6kl_sdio_cleanup_scatter(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct hif_scatter_req *s_req, *tmp_req;

        /* empty the free list */
        spin_lock_bh(&ar_sdio->scat_lock);
        list_for_each_entry_safe(s_req, tmp_req, &ar_sdio->scat_req, list) {
                list_del(&s_req->list);
                spin_unlock_bh(&ar_sdio->scat_lock);

                /*
                 * FIXME: should we also call completion handler with
                 * ath6kl_hif_rw_comp_handler() with status -ECANCELED so
                 * that the packet is properly freed?
                 */
                if (s_req->busrequest)
                        ath6kl_sdio_free_bus_req(ar_sdio, s_req->busrequest);
                kfree(s_req->virt_dma_buf);
                kfree(s_req->sgentries);
                kfree(s_req);

                spin_lock_bh(&ar_sdio->scat_lock);
        }
        spin_unlock_bh(&ar_sdio->scat_lock);
}

/* setup of HIF scatter resources */
static int ath6kl_sdio_enable_scatter(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct htc_target *target = ar->htc_target;
        int ret;
        bool virt_scat = false;

        if (ar_sdio->scatter_enabled)
                return 0;

        ar_sdio->scatter_enabled = true;

        /* check if host supports scatter and it meets our requirements */
        if (ar_sdio->func->card->host->max_segs < MAX_SCATTER_ENTRIES_PER_REQ) {
                ath6kl_err("host only supports scatter of :%d entries, need: %d\n",
                           ar_sdio->func->card->host->max_segs,
                           MAX_SCATTER_ENTRIES_PER_REQ);
                virt_scat = true;
        }

        if (!virt_scat) {
                ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
                                MAX_SCATTER_ENTRIES_PER_REQ,
                                MAX_SCATTER_REQUESTS, virt_scat);

                if (!ret) {
                        ath6kl_dbg(ATH6KL_DBG_BOOT,
                                   "hif-scatter enabled requests %d entries %d\n",
                                   MAX_SCATTER_REQUESTS,
                                   MAX_SCATTER_ENTRIES_PER_REQ);

                        target->max_scat_entries = MAX_SCATTER_ENTRIES_PER_REQ;
                        target->max_xfer_szper_scatreq =
                                                MAX_SCATTER_REQ_TRANSFER_SIZE;
                } else {
                        ath6kl_sdio_cleanup_scatter(ar);
                        ath6kl_warn("hif scatter resource setup failed, trying virtual scatter method\n");
                }
        }

        if (virt_scat || ret) {
                ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
                                ATH6KL_SCATTER_ENTRIES_PER_REQ,
                                ATH6KL_SCATTER_REQS, virt_scat);

                if (ret) {
                        ath6kl_err("failed to alloc virtual scatter resources !\n");
                        ath6kl_sdio_cleanup_scatter(ar);
                        return ret;
                }

                ath6kl_dbg(ATH6KL_DBG_BOOT,
                           "virtual scatter enabled requests %d entries %d\n",
                           ATH6KL_SCATTER_REQS, ATH6KL_SCATTER_ENTRIES_PER_REQ);

                target->max_scat_entries = ATH6KL_SCATTER_ENTRIES_PER_REQ;
                target->max_xfer_szper_scatreq =
                                        ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
        }

        return 0;
}

static int ath6kl_sdio_config(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct sdio_func *func = ar_sdio->func;
        int ret;

        sdio_claim_host(func);

        if ((ar_sdio->id->device & MANUFACTURER_ID_ATH6KL_BASE_MASK) >=
            MANUFACTURER_ID_AR6003_BASE) {
                /* enable 4-bit ASYNC interrupt on AR6003 or later */
                ret = ath6kl_sdio_func0_cmd52_wr_byte(func->card,
                                                CCCR_SDIO_IRQ_MODE_REG,
                                                SDIO_IRQ_MODE_ASYNC_4BIT_IRQ);
                if (ret) {
                        ath6kl_err("Failed to enable 4-bit async irq mode %d\n",
                                   ret);
                        goto out;
                }

                ath6kl_dbg(ATH6KL_DBG_BOOT, "4-bit async irq mode enabled\n");
        }

        /* give us some time to enable, in ms */
        func->enable_timeout = 100;

        ret = sdio_set_block_size(func, HIF_MBOX_BLOCK_SIZE);
        if (ret) {
                ath6kl_err("Set sdio block size %d failed: %d)\n",
                           HIF_MBOX_BLOCK_SIZE, ret);
                goto out;
        }

out:
        sdio_release_host(func);

        return ret;
}

static int ath6kl_set_sdio_pm_caps(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct sdio_func *func = ar_sdio->func;
        mmc_pm_flag_t flags;
        int ret;

        flags = sdio_get_host_pm_caps(func);

        ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sdio suspend pm_caps 0x%x\n", flags);

        if (!(flags & MMC_PM_WAKE_SDIO_IRQ) ||
            !(flags & MMC_PM_KEEP_POWER))
                return -EINVAL;

        ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
        if (ret) {
                ath6kl_err("set sdio keep pwr flag failed: %d\n", ret);
                return ret;
        }

        /* sdio irq wakes up host */
        ret = sdio_set_host_pm_flags(func, MMC_PM_WAKE_SDIO_IRQ);
        if (ret)
                ath6kl_err("set sdio wake irq flag failed: %d\n", ret);

        return ret;
}

static int ath6kl_sdio_suspend(struct ath6kl *ar, struct cfg80211_wowlan *wow)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct sdio_func *func = ar_sdio->func;
        mmc_pm_flag_t flags;
        bool try_deepsleep = false;
        int ret;

        if (ar->state == ATH6KL_STATE_SCHED_SCAN) {
                ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sched scan is in progress\n");

                ret = ath6kl_set_sdio_pm_caps(ar);
                if (ret)
                        goto cut_pwr;

                ret =  ath6kl_cfg80211_suspend(ar,
                                               ATH6KL_CFG_SUSPEND_SCHED_SCAN,
                                               NULL);
                if (ret)
                        goto cut_pwr;

                return 0;
        }

        if (ar->suspend_mode == WLAN_POWER_STATE_WOW ||
            (!ar->suspend_mode && wow)) {

                ret = ath6kl_set_sdio_pm_caps(ar);
                if (ret)
                        goto cut_pwr;

                ret = ath6kl_cfg80211_suspend(ar, ATH6KL_CFG_SUSPEND_WOW, wow);
                if (ret && ret != -ENOTCONN)
                        ath6kl_err("wow suspend failed: %d\n", ret);

                if (ret &&
                    (!ar->wow_suspend_mode ||
                     ar->wow_suspend_mode == WLAN_POWER_STATE_DEEP_SLEEP))
                        try_deepsleep = true;
                else if (ret &&
                         ar->wow_suspend_mode == WLAN_POWER_STATE_CUT_PWR)
                        goto cut_pwr;
                if (!ret)
                        return 0;
        }

        if (ar->suspend_mode == WLAN_POWER_STATE_DEEP_SLEEP ||
            !ar->suspend_mode || try_deepsleep) {

                flags = sdio_get_host_pm_caps(func);
                if (!(flags & MMC_PM_KEEP_POWER))
                        goto cut_pwr;

                ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
                if (ret)
                        goto cut_pwr;

                /*
                 * Workaround to support Deep Sleep with MSM, set the host pm
                 * flag as MMC_PM_WAKE_SDIO_IRQ to allow SDCC deiver to disable
                 * the sdc2_clock and internally allows MSM to enter
                 * TCXO shutdown properly.
                 */
                if ((flags & MMC_PM_WAKE_SDIO_IRQ)) {
                        ret = sdio_set_host_pm_flags(func,
                                                MMC_PM_WAKE_SDIO_IRQ);
                        if (ret)
                                goto cut_pwr;
                }

                ret = ath6kl_cfg80211_suspend(ar, ATH6KL_CFG_SUSPEND_DEEPSLEEP,
                                              NULL);
                if (ret)
                        goto cut_pwr;

                return 0;
        }

cut_pwr:
        return ath6kl_cfg80211_suspend(ar, ATH6KL_CFG_SUSPEND_CUTPOWER, NULL);
}

static int ath6kl_sdio_resume(struct ath6kl *ar)
{
        switch (ar->state) {
        case ATH6KL_STATE_OFF:
        case ATH6KL_STATE_CUTPOWER:
                ath6kl_dbg(ATH6KL_DBG_SUSPEND,
                           "sdio resume configuring sdio\n");

                /* need to set sdio settings after power is cut from sdio */
                ath6kl_sdio_config(ar);
                break;

        case ATH6KL_STATE_ON:
                break;

        case ATH6KL_STATE_DEEPSLEEP:
                break;

        case ATH6KL_STATE_WOW:
                break;

        case ATH6KL_STATE_SCHED_SCAN:
                break;

        case ATH6KL_STATE_SUSPENDING:
                break;

        case ATH6KL_STATE_RESUMING:
                break;
        }

        ath6kl_cfg80211_resume(ar);

        return 0;
}

/* set the window address register (using 4-byte register access ). */
static int ath6kl_set_addrwin_reg(struct ath6kl *ar, u32 reg_addr, u32 addr)
{
        int status;
        u8 addr_val[4];
        s32 i;

        /*
         * Write bytes 1,2,3 of the register to set the upper address bytes,
         * the LSB is written last to initiate the access cycle
         */

        for (i = 1; i <= 3; i++) {
                /*
                 * Fill the buffer with the address byte value we want to
                 * hit 4 times.
                 */
                memset(addr_val, ((u8 *)&addr)[i], 4);

                /*
                 * Hit each byte of the register address with a 4-byte
                 * write operation to the same address, this is a harmless
                 * operation.
                 */
                status = ath6kl_sdio_read_write_sync(ar, reg_addr + i, addr_val,
                                             4, HIF_WR_SYNC_BYTE_FIX);
                if (status)
                        break;
        }

        if (status) {
                ath6kl_err("%s: failed to write initial bytes of 0x%x "
                           "to window reg: 0x%X\n", __func__,
                           addr, reg_addr);
                return status;
        }

        /*
         * Write the address register again, this time write the whole
         * 4-byte value. The effect here is that the LSB write causes the
         * cycle to start, the extra 3 byte write to bytes 1,2,3 has no
         * effect since we are writing the same values again
         */
        status = ath6kl_sdio_read_write_sync(ar, reg_addr, (u8 *)(&addr),

                                     4, HIF_WR_SYNC_BYTE_INC);

        if (status) {
                ath6kl_err("%s: failed to write 0x%x to window reg: 0x%X\n",
                           __func__, addr, reg_addr);
                return status;
        }

        return 0;
}

static int ath6kl_sdio_diag_read32(struct ath6kl *ar, u32 address, u32 *data)
{
        int status;

        /* set window register to start read cycle */
        status = ath6kl_set_addrwin_reg(ar, WINDOW_READ_ADDR_ADDRESS,
                                        address);

        if (status)
                return status;

        /* read the data */
        status = ath6kl_sdio_read_write_sync(ar, WINDOW_DATA_ADDRESS,
                                (u8 *)data, sizeof(u32), HIF_RD_SYNC_BYTE_INC);
        if (status) {
                ath6kl_err("%s: failed to read from window data addr\n",
                           __func__);
                return status;
        }

        return status;
}

static int ath6kl_sdio_diag_write32(struct ath6kl *ar, u32 address,
                                    __le32 data)
{
        int status;
        u32 val = (__force u32) data;

        /* set write data */
        status = ath6kl_sdio_read_write_sync(ar, WINDOW_DATA_ADDRESS,
                                (u8 *) &val, sizeof(u32), HIF_WR_SYNC_BYTE_INC);
        if (status) {
                ath6kl_err("%s: failed to write 0x%x to window data addr\n",
                           __func__, data);
                return status;
        }

        /* set window register, which starts the write cycle */
        return ath6kl_set_addrwin_reg(ar, WINDOW_WRITE_ADDR_ADDRESS,
                                      address);
}

static int ath6kl_sdio_bmi_credits(struct ath6kl *ar)
{
        u32 addr;
        unsigned long timeout;
        int ret;

        ar->bmi.cmd_credits = 0;

        /* Read the counter register to get the command credits */
        addr = COUNT_DEC_ADDRESS + (HTC_MAILBOX_NUM_MAX + ENDPOINT1) * 4;

        timeout = jiffies + msecs_to_jiffies(BMI_COMMUNICATION_TIMEOUT);
        while (time_before(jiffies, timeout) && !ar->bmi.cmd_credits) {

                /*
                 * Hit the credit counter with a 4-byte access, the first byte
                 * read will hit the counter and cause a decrement, while the
                 * remaining 3 bytes has no effect. The rationale behind this
                 * is to make all HIF accesses 4-byte aligned.
                 */
                ret = ath6kl_sdio_read_write_sync(ar, addr,
                                         (u8 *)&ar->bmi.cmd_credits, 4,
                                         HIF_RD_SYNC_BYTE_INC);
                if (ret) {
                        ath6kl_err("Unable to decrement the command credit "
                                                "count register: %d\n", ret);
                        return ret;
                }

                /* The counter is only 8 bits.
                 * Ignore anything in the upper 3 bytes
                 */
                ar->bmi.cmd_credits &= 0xFF;
        }

        if (!ar->bmi.cmd_credits) {
                ath6kl_err("bmi communication timeout\n");
                return -ETIMEDOUT;
        }

        return 0;
}

static int ath6kl_bmi_get_rx_lkahd(struct ath6kl *ar)
{
        unsigned long timeout;
        u32 rx_word = 0;
        int ret = 0;

        timeout = jiffies + msecs_to_jiffies(BMI_COMMUNICATION_TIMEOUT);
        while ((time_before(jiffies, timeout)) && !rx_word) {
                ret = ath6kl_sdio_read_write_sync(ar,
                                        RX_LOOKAHEAD_VALID_ADDRESS,
                                        (u8 *)&rx_word, sizeof(rx_word),
                                        HIF_RD_SYNC_BYTE_INC);
                if (ret) {
                        ath6kl_err("unable to read RX_LOOKAHEAD_VALID\n");
                        return ret;
                }

                 /* all we really want is one bit */
                rx_word &= (1 << ENDPOINT1);
        }

        if (!rx_word) {
                ath6kl_err("bmi_recv_buf FIFO empty\n");
                return -EINVAL;
        }

        return ret;
}

static int ath6kl_sdio_bmi_write(struct ath6kl *ar, u8 *buf, u32 len)
{
        int ret;
        u32 addr;

        ret = ath6kl_sdio_bmi_credits(ar);
        if (ret)
                return ret;

        addr = ar->mbox_info.htc_addr;

        ret = ath6kl_sdio_read_write_sync(ar, addr, buf, len,
                                          HIF_WR_SYNC_BYTE_INC);
        if (ret)
                ath6kl_err("unable to send the bmi data to the device\n");

        return ret;
}

static int ath6kl_sdio_bmi_read(struct ath6kl *ar, u8 *buf, u32 len)
{
        int ret;
        u32 addr;

        /*
         * During normal bootup, small reads may be required.
         * Rather than issue an HIF Read and then wait as the Target
         * adds successive bytes to the FIFO, we wait here until
         * we know that response data is available.
         *
         * This allows us to cleanly timeout on an unexpected
         * Target failure rather than risk problems at the HIF level.
         * In particular, this avoids SDIO timeouts and possibly garbage
         * data on some host controllers.  And on an interconnect
         * such as Compact Flash (as well as some SDIO masters) which
         * does not provide any indication on data timeout, it avoids
         * a potential hang or garbage response.
         *
         * Synchronization is more difficult for reads larger than the
         * size of the MBOX FIFO (128B), because the Target is unable
         * to push the 129th byte of data until AFTER the Host posts an
         * HIF Read and removes some FIFO data.  So for large reads the
         * Host proceeds to post an HIF Read BEFORE all the data is
         * actually available to read.  Fortunately, large BMI reads do
         * not occur in practice -- they're supported for debug/development.
         *
         * So Host/Target BMI synchronization is divided into these cases:
         *  CASE 1: length < 4
         *        Should not happen
         *
         *  CASE 2: 4 <= length <= 128
         *        Wait for first 4 bytes to be in FIFO
         *        If CONSERVATIVE_BMI_READ is enabled, also wait for
         *        a BMI command credit, which indicates that the ENTIRE
         *        response is available in the the FIFO
         *
         *  CASE 3: length > 128
         *        Wait for the first 4 bytes to be in FIFO
         *
         * For most uses, a small timeout should be sufficient and we will
         * usually see a response quickly; but there may be some unusual
         * (debug) cases of BMI_EXECUTE where we want an larger timeout.
         * For now, we use an unbounded busy loop while waiting for
         * BMI_EXECUTE.
         *
         * If BMI_EXECUTE ever needs to support longer-latency execution,
         * especially in production, this code needs to be enhanced to sleep
         * and yield.  Also note that BMI_COMMUNICATION_TIMEOUT is currently
         * a function of Host processor speed.
         */
        if (len >= 4) { /* NB: Currently, always true */
                ret = ath6kl_bmi_get_rx_lkahd(ar);
                if (ret)
                        return ret;
        }

        addr = ar->mbox_info.htc_addr;
        ret = ath6kl_sdio_read_write_sync(ar, addr, buf, len,
                                  HIF_RD_SYNC_BYTE_INC);
        if (ret) {
                ath6kl_err("Unable to read the bmi data from the device: %d\n",
                           ret);
                return ret;
        }

        return 0;
}

static void ath6kl_sdio_stop(struct ath6kl *ar)
{
        struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
        struct bus_request *req, *tmp_req;
        void *context;

        /* FIXME: make sure that wq is not queued again */

        cancel_work_sync(&ar_sdio->wr_async_work);

        spin_lock_bh(&ar_sdio->wr_async_lock);

        list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) {
                list_del(&req->list);

                if (req->scat_req) {
                        /* this is a scatter gather request */
                        req->scat_req->status = -ECANCELED;
                        req->scat_req->complete(ar_sdio->ar->htc_target,
                                                req->scat_req);
                } else {
                        context = req->packet;
                        ath6kl_sdio_free_bus_req(ar_sdio, req);
                        ath6kl_hif_rw_comp_handler(context, -ECANCELED);
                }
        }

        spin_unlock_bh(&ar_sdio->wr_async_lock);

        WARN_ON(get_queue_depth(&ar_sdio->scat_req) != 4);
}

static const struct ath6kl_hif_ops ath6kl_sdio_ops = {
        .read_write_sync = ath6kl_sdio_read_write_sync,
        .write_async = ath6kl_sdio_write_async,
        .irq_enable = ath6kl_sdio_irq_enable,
        .irq_disable = ath6kl_sdio_irq_disable,
        .scatter_req_get = ath6kl_sdio_scatter_req_get,
        .scatter_req_add = ath6kl_sdio_scatter_req_add,
        .enable_scatter = ath6kl_sdio_enable_scatter,
        .scat_req_rw = ath6kl_sdio_async_rw_scatter,
        .cleanup_scatter = ath6kl_sdio_cleanup_scatter,
        .suspend = ath6kl_sdio_suspend,
        .resume = ath6kl_sdio_resume,
        .diag_read32 = ath6kl_sdio_diag_read32,
        .diag_write32 = ath6kl_sdio_diag_write32,
        .bmi_read = ath6kl_sdio_bmi_read,
        .bmi_write = ath6kl_sdio_bmi_write,
        .power_on = ath6kl_sdio_power_on,
        .power_off = ath6kl_sdio_power_off,
        .stop = ath6kl_sdio_stop,
};

#ifdef CONFIG_PM_SLEEP

/*
 * Empty handlers so that mmc subsystem doesn't remove us entirely during
 * suspend. We instead follow cfg80211 suspend/resume handlers.
 */
static int ath6kl_sdio_pm_suspend(struct device *device)
{
        ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sdio pm suspend\n");

        return 0;
}

static int ath6kl_sdio_pm_resume(struct device *device)
{
        ath6kl_dbg(ATH6KL_DBG_SUSPEND, "sdio pm resume\n");

        return 0;
}

static SIMPLE_DEV_PM_OPS(ath6kl_sdio_pm_ops, ath6kl_sdio_pm_suspend,
                         ath6kl_sdio_pm_resume);

#define ATH6KL_SDIO_PM_OPS (&ath6kl_sdio_pm_ops)

#else

#define ATH6KL_SDIO_PM_OPS NULL

#endif /* CONFIG_PM_SLEEP */

static int ath6kl_sdio_probe(struct sdio_func *func,
                             const struct sdio_device_id *id)
{
        int ret;
        struct ath6kl_sdio *ar_sdio;
        struct ath6kl *ar;
        int count;

        ath6kl_dbg(ATH6KL_DBG_BOOT,
                   "sdio new func %d vendor 0x%x device 0x%x block 0x%x/0x%x\n",
                   func->num, func->vendor, func->device,
                   func->max_blksize, func->cur_blksize);

        ar_sdio = kzalloc(sizeof(struct ath6kl_sdio), GFP_KERNEL);
        if (!ar_sdio)
                return -ENOMEM;

        ar_sdio->dma_buffer = kzalloc(HIF_DMA_BUFFER_SIZE, GFP_KERNEL);
        if (!ar_sdio->dma_buffer) {
                ret = -ENOMEM;
                goto err_hif;
        }

        ar_sdio->func = func;
        sdio_set_drvdata(func, ar_sdio);

        ar_sdio->id = id;
        ar_sdio->is_disabled = true;

        spin_lock_init(&ar_sdio->lock);
        spin_lock_init(&ar_sdio->scat_lock);
        spin_lock_init(&ar_sdio->wr_async_lock);
        mutex_init(&ar_sdio->dma_buffer_mutex);

        INIT_LIST_HEAD(&ar_sdio->scat_req);
        INIT_LIST_HEAD(&ar_sdio->bus_req_freeq);
        INIT_LIST_HEAD(&ar_sdio->wr_asyncq);

        INIT_WORK(&ar_sdio->wr_async_work, ath6kl_sdio_write_async_work);

        init_waitqueue_head(&ar_sdio->irq_wq);

        for (count = 0; count < BUS_REQUEST_MAX_NUM; count++)
                ath6kl_sdio_free_bus_req(ar_sdio, &ar_sdio->bus_req[count]);

        ar = ath6kl_core_create(&ar_sdio->func->dev);
        if (!ar) {
                ath6kl_err("Failed to alloc ath6kl core\n");
                ret = -ENOMEM;
                goto err_dma;
        }

        ar_sdio->ar = ar;
        ar->hif_type = ATH6KL_HIF_TYPE_SDIO;
        ar->hif_priv = ar_sdio;
        ar->hif_ops = &ath6kl_sdio_ops;
        ar->bmi.max_data_size = 256;

        ath6kl_sdio_set_mbox_info(ar);

        ret = ath6kl_sdio_config(ar);
        if (ret) {
                ath6kl_err("Failed to config sdio: %d\n", ret);
                goto err_core_alloc;
        }

        ret = ath6kl_core_init(ar);
        if (ret) {
                ath6kl_err("Failed to init ath6kl core\n");
                goto err_core_alloc;
        }

        return ret;

err_core_alloc:
        ath6kl_core_destroy(ar_sdio->ar);
err_dma:
        kfree(ar_sdio->dma_buffer);
err_hif:
        kfree(ar_sdio);

        return ret;
}

static void ath6kl_sdio_remove(struct sdio_func *func)
{
        struct ath6kl_sdio *ar_sdio;

        ath6kl_dbg(ATH6KL_DBG_BOOT,
                   "sdio removed func %d vendor 0x%x device 0x%x\n",
                   func->num, func->vendor, func->device);

        ar_sdio = sdio_get_drvdata(func);

        ath6kl_stop_txrx(ar_sdio->ar);
        cancel_work_sync(&ar_sdio->wr_async_work);

        ath6kl_core_cleanup(ar_sdio->ar);
        ath6kl_core_destroy(ar_sdio->ar);

        kfree(ar_sdio->dma_buffer);
        kfree(ar_sdio);
}

static const struct sdio_device_id ath6kl_sdio_devices[] = {
        {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x0))},
        {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x1))},
        {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6004_BASE | 0x0))},
        {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6004_BASE | 0x1))},
        {},
};

MODULE_DEVICE_TABLE(sdio, ath6kl_sdio_devices);

static struct sdio_driver ath6kl_sdio_driver = {
        .name = "ath6kl_sdio",
        .id_table = ath6kl_sdio_devices,
        .probe = ath6kl_sdio_probe,
        .remove = ath6kl_sdio_remove,
        .drv.pm = ATH6KL_SDIO_PM_OPS,
};

static int __init ath6kl_sdio_init(void)
{
        int ret;

        ret = sdio_register_driver(&ath6kl_sdio_driver);
        if (ret)
                ath6kl_err("sdio driver registration failed: %d\n", ret);

        return ret;
}

static void __exit ath6kl_sdio_exit(void)
{
        sdio_unregister_driver(&ath6kl_sdio_driver);
}

module_init(ath6kl_sdio_init);
module_exit(ath6kl_sdio_exit);

MODULE_AUTHOR("Atheros Communications, Inc.");
MODULE_DESCRIPTION("Driver support for Atheros AR600x SDIO devices");
MODULE_LICENSE("Dual BSD/GPL");

MODULE_FIRMWARE(AR6003_HW_2_0_FW_DIR "/" AR6003_HW_2_0_OTP_FILE);
MODULE_FIRMWARE(AR6003_HW_2_0_FW_DIR "/" AR6003_HW_2_0_FIRMWARE_FILE);
MODULE_FIRMWARE(AR6003_HW_2_0_FW_DIR "/" AR6003_HW_2_0_PATCH_FILE);
MODULE_FIRMWARE(AR6003_HW_2_0_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6003_HW_2_0_DEFAULT_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6003_HW_2_1_1_FW_DIR "/" AR6003_HW_2_1_1_OTP_FILE);
MODULE_FIRMWARE(AR6003_HW_2_1_1_FW_DIR "/" AR6003_HW_2_1_1_FIRMWARE_FILE);
MODULE_FIRMWARE(AR6003_HW_2_1_1_FW_DIR "/" AR6003_HW_2_1_1_PATCH_FILE);
MODULE_FIRMWARE(AR6003_HW_2_1_1_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6003_HW_2_1_1_DEFAULT_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6004_HW_1_0_FW_DIR "/" AR6004_HW_1_0_FIRMWARE_FILE);
MODULE_FIRMWARE(AR6004_HW_1_0_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6004_HW_1_0_DEFAULT_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6004_HW_1_1_FW_DIR "/" AR6004_HW_1_1_FIRMWARE_FILE);
MODULE_FIRMWARE(AR6004_HW_1_1_BOARD_DATA_FILE);
MODULE_FIRMWARE(AR6004_HW_1_1_DEFAULT_BOARD_DATA_FILE);