Atheros AR600x driver + build glue

chromeos/drivers/ath6kl/hif/sdio/linux_sdio/src/hif.c

+//------------------------------------------------------------------------------
+// <copyright file="hif.c" company="Atheros">
+//    Copyright (c) 2004-2008 Atheros Corporation.  All rights reserved.
+// 
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation;
+//
+// Software distributed under the License is distributed on an "AS
+// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// rights and limitations under the License.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// HIF layer reference implementation for Linux Native MMC stack
+//
+// Author(s): ="Atheros"
+//==============================================================================
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+#include <linux/mmc/sdio.h>
+#include <linux/kthread.h>
+
+/* by default setup a bounce buffer for the data packets, if the underlying host controller driver
+   does not use DMA you may be able to skip this step and save the memory allocation and transfer time */
+#define HIF_USE_DMA_BOUNCE_BUFFER 1
+#include "hif_internal.h"
+#define ATH_MODULE_NAME hif
+#include "a_debug.h"
+
+
+#if HIF_USE_DMA_BOUNCE_BUFFER
+/* 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.  
+ */
+#define BUFFER_NEEDS_BOUNCE(buffer)  (((A_UINT32)(buffer) & 0x3) || !virt_addr_valid((buffer)))
+#else
+#define BUFFER_NEEDS_BOUNCE(buffer)   (FALSE)
+#endif
+                
+static int hifDeviceInserted(struct sdio_func *func, const struct sdio_device_id *id);
+static void hifDeviceRemoved(struct sdio_func *func);
+static HIF_DEVICE *addHifDevice(struct sdio_func *func);
+static HIF_DEVICE *getHifDevice(struct sdio_func *func);
+static void delHifDevice(HIF_DEVICE * device);
+static int Func0_CMD52WriteByte(struct mmc_card *card, unsigned int address, unsigned char byte);
+
+int reset_sdio_on_unload = 0;
+module_param(reset_sdio_on_unload, int, 0644);
+
+/* ------ Static Variables ------ */
+static const struct sdio_device_id ar6k_id_table[] = {
+    {  SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6002_BASE | 0x0))  },
+    {  SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6002_BASE | 0x1))  },
+    {  SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x0))  },
+    { /* null */                                         },
+};
+MODULE_DEVICE_TABLE(sdio, ar6k_id_table);
+
+static struct sdio_driver ar6k_driver = {
+        .name = "ar6k_wlan",
+        .id_table = ar6k_id_table,
+        .probe = hifDeviceInserted,
+        .remove = hifDeviceRemoved,
+};
+/* make sure we only unregister when registered. */
+static int registered = 0;
+
+OSDRV_CALLBACKS osdrvCallbacks;
+extern A_UINT32 onebitmode;
+extern A_UINT32 busspeedlow;
+extern A_UINT32 debughif;
+
+static BUS_REQUEST *hifAllocateBusRequest(HIF_DEVICE *device);
+static void hifFreeBusRequest(HIF_DEVICE *device, BUS_REQUEST *busrequest);
+static void ResetAllCards(void);
+
+#ifdef DEBUG
+
+ATH_DEBUG_INSTANTIATE_MODULE_VAR(hif,
+                                 "hif",
+                                 "(Linux MMC) Host Interconnect Framework",
+                                 ATH_DEBUG_MASK_DEFAULTS,
+                                 0,
+                                 NULL);
+                                 
+#endif
+
+
+/* ------ Functions ------ */
+A_STATUS HIFInit(OSDRV_CALLBACKS *callbacks)
+{
+    int status;
+    AR_DEBUG_ASSERT(callbacks != NULL);
+
+    A_REGISTER_MODULE_DEBUG_INFO(hif);
+
+    /* store the callback handlers */
+    osdrvCallbacks = *callbacks;
+
+    /* Register with bus driver core */
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFInit registering\n"));
+    registered = 1;
+    status = sdio_register_driver(&ar6k_driver);
+    AR_DEBUG_ASSERT(status==0);
+
+    if (status != 0) {
+        return A_ERROR;
+    }
+
+    return A_OK;
+
+}
+
+static A_STATUS
+__HIFReadWrite(HIF_DEVICE *device,
+             A_UINT32 address,
+             A_UCHAR *buffer,
+             A_UINT32 length,
+             A_UINT32 request,
+             void *context)
+{
+    A_UINT8 opcode;
+    A_STATUS    status = A_OK;
+    int     ret;
+    A_UINT8 *tbuffer;
+    A_BOOL   bounced = FALSE;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device: 0x%p, buffer:0x%p (addr:0x%X)\n", 
+                    device, buffer, address));
+
+    do {
+        if (request & HIF_EXTENDED_IO) {
+            //AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Command type: CMD53\n"));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid command type: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_BLOCK_BASIS) {
+            /* round to whole block length size */
+            length = (length / HIF_MBOX_BLOCK_SIZE) * HIF_MBOX_BLOCK_SIZE;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Block mode (BlockLen: %d)\n",
+                            length));
+        } else if (request & HIF_BYTE_BASIS) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Byte mode (BlockLen: %d)\n",
+                            length));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid data mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+#if 0
+        /* useful for checking register accesses */
+        if (length & 0x3) {
+            A_PRINTF(KERN_ALERT"AR6000: HIF (%s) is not a multiple of 4 bytes, addr:0x%X, len:%d\n",
+                                request & HIF_WRITE ? "write":"read", address, length);
+        }
+#endif
+
+        if (request & HIF_WRITE) {
+            if ((address >= HIF_MBOX_START_ADDR(0)) &&
+                (address <= HIF_MBOX_END_ADDR(3)))
+            {
+    
+                AR_DEBUG_ASSERT(length <= HIF_MBOX_WIDTH);
+    
+                /*
+                 * Mailbox write. Adjust the address so that the last byte
+                 * falls on the EOM address.
+                 */
+                address += (HIF_MBOX_WIDTH - length);
+            }
+        }
+
+        if (request & HIF_FIXED_ADDRESS) {
+            opcode = CMD53_FIXED_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Address mode: Fixed 0x%X\n", address));
+        } else if (request & HIF_INCREMENTAL_ADDRESS) {
+            opcode = CMD53_INCR_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Address mode: Incremental 0x%X\n", address));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid address mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_WRITE) {
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (BUFFER_NEEDS_BOUNCE(buffer)) {
+                AR_DEBUG_ASSERT(device->dma_buffer != NULL);
+                tbuffer = device->dma_buffer;
+                    /* copy the write data to the dma buffer */
+                AR_DEBUG_ASSERT(length <= HIF_DMA_BUFFER_SIZE);
+                memcpy(tbuffer, buffer, length);
+                bounced = TRUE;
+            } else {
+                tbuffer = buffer;    
+            }
+#else
+                tbuffer = buffer;
+#endif
+            if (opcode == CMD53_FIXED_ADDRESS) {
+                ret = sdio_writesb(device->func, address, tbuffer, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: writesb ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            } else {
+                ret = sdio_memcpy_toio(device->func, address, tbuffer, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: writeio ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            }
+        } else if (request & HIF_READ) {
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (BUFFER_NEEDS_BOUNCE(buffer)) {
+                AR_DEBUG_ASSERT(device->dma_buffer != NULL);
+                AR_DEBUG_ASSERT(length <= HIF_DMA_BUFFER_SIZE);
+                tbuffer = device->dma_buffer;
+                bounced = TRUE;
+            } else {
+                tbuffer = buffer;    
+            }
+#else
+            tbuffer = buffer;
+#endif
+            if (opcode == CMD53_FIXED_ADDRESS) {
+                ret = sdio_readsb(device->func, tbuffer, address, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: readsb ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            } else {
+                ret = sdio_memcpy_fromio(device->func, tbuffer, address, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: readio ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            }
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (bounced) {
+                   /* copy the read data from the dma buffer */
+                memcpy(buffer, tbuffer, length);
+            }
+#endif
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid direction: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (ret) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: SDIO bus operation failed! MMC stack returned : %d \n", ret));
+            status = A_ERROR;
+        }
+    } while (FALSE);
+
+    return status;
+}
+
+/* queue a read/write request */
+A_STATUS
+HIFReadWrite(HIF_DEVICE *device,
+             A_UINT32 address,
+             A_UCHAR *buffer,
+             A_UINT32 length,
+             A_UINT32 request,
+             void *context)
+{
+    A_STATUS    status = A_OK;
+    unsigned long flags;
+    BUS_REQUEST *busrequest;
+    BUS_REQUEST *async;
+    BUS_REQUEST *active;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device: %p addr:0x%X\n", device,address));
+
+    do {            
+        if ((request & HIF_ASYNCHRONOUS) || (request & HIF_SYNCHRONOUS)){
+            /* serialize all requests through the async thread */
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Execution mode: %s\n", 
+                        (request & HIF_ASYNCHRONOUS)?"Async":"Synch"));
+            busrequest = hifAllocateBusRequest(device);
+            if (busrequest == NULL) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, 
+                    ("AR6000: no async bus requests available (%s, addr:0x%X, len:%d) \n", 
+                        request & HIF_READ ? "READ":"WRITE", address, length));
+                return A_ERROR;
+            }
+            spin_lock_irqsave(&device->asynclock, flags);
+            busrequest->address = address;
+            busrequest->buffer = buffer;
+            busrequest->length = length;
+            busrequest->request = request;
+            busrequest->context = context;
+            /* add to async list */
+            active = device->asyncreq;
+            if (active == NULL) {
+                device->asyncreq = busrequest;
+                device->asyncreq->inusenext = NULL;
+            } else {
+                for (async = device->asyncreq;
+                     async != NULL;
+                     async = async->inusenext) {
+                     active =  async;
+                }
+                active->inusenext = busrequest;
+                busrequest->inusenext = NULL;
+            }
+            spin_unlock_irqrestore(&device->asynclock, flags);
+            if (request & HIF_SYNCHRONOUS) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: queued sync req: 0x%X\n", (unsigned int)busrequest));
+
+                /* wait for completion */
+                up(&device->sem_async);
+                if (down_interruptible(&busrequest->sem_req) != 0) {
+                    /* interrupted, exit */
+                    return A_ERROR;
+                } else {
+                    A_STATUS status = busrequest->status;
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: sync return freeing 0x%X: 0x%X\n", 
+                                                      (unsigned int)busrequest, busrequest->status));
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: freeing req: 0x%X\n", (unsigned int)request));
+                    hifFreeBusRequest(device, busrequest);
+                    return status;
+                }
+            } else {
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: queued async req: 0x%X\n", (unsigned int)busrequest));
+                up(&device->sem_async);
+                return A_PENDING;
+            }
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid execution mode: 0x%08x\n", (unsigned int)request));
+            status = A_EINVAL;
+            break;
+        }
+    } while(0);
+
+    return status;
+}
+/* thread to serialize all requests, both sync and async */
+static int async_task(void *param)
+ {
+    HIF_DEVICE *device;
+    BUS_REQUEST *request;
+    A_STATUS status;
+    unsigned long flags;
+
+    device = (HIF_DEVICE *)param;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task\n"));
+    set_current_state(TASK_INTERRUPTIBLE);
+    while(!device->async_shutdown) {
+        /* wait for work */
+        if (down_interruptible(&device->sem_async) != 0) {
+            /* interrupted, exit */
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task interrupted\n"));
+            break;
+        }
+        if (device->async_shutdown) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task stopping\n"));
+            break;
+        }
+        /* we want to hold the host over multiple cmds if possible, but holding the host blocks card interrupts */
+        sdio_claim_host(device->func);
+        spin_lock_irqsave(&device->asynclock, flags);
+        /* pull the request to work on */
+        while (device->asyncreq != NULL) {
+            request = device->asyncreq;
+            if (request->inusenext != NULL) {
+                device->asyncreq = request->inusenext;
+            } else {
+                device->asyncreq = NULL;
+            }
+            spin_unlock_irqrestore(&device->asynclock, flags);
+            /* call HIFReadWrite in sync mode to do the work */
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task processing req: 0x%X\n", (unsigned int)request));
+            status = __HIFReadWrite(device, request->address, request->buffer,
+                                  request->length, request->request & ~HIF_SYNCHRONOUS, NULL);
+            if (request->request & HIF_ASYNCHRONOUS) {
+                void *context = request->context;
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task freeing req: 0x%X\n", (unsigned int)request));
+                hifFreeBusRequest(device, request);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task completion routine req: 0x%X\n", (unsigned int)request));
+                device->htcCallbacks.rwCompletionHandler(context, status);
+            } else {
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task upping req: 0x%X\n", (unsigned int)request));
+                request->status = status;
+                up(&request->sem_req);
+            }
+            spin_lock_irqsave(&device->asynclock, flags);
+        }
+        spin_unlock_irqrestore(&device->asynclock, flags);
+        sdio_release_host(device->func);
+    }
+
+    complete_and_exit(&device->async_completion, 0);
+    return 0;
+ }
+
+A_STATUS
+HIFConfigureDevice(HIF_DEVICE *device, HIF_DEVICE_CONFIG_OPCODE opcode,
+                   void *config, A_UINT32 configLen)
+{
+    A_UINT32 count;
+
+    switch(opcode) {
+        case HIF_DEVICE_GET_MBOX_BLOCK_SIZE:
+            ((A_UINT32 *)config)[0] = HIF_MBOX0_BLOCK_SIZE;
+            ((A_UINT32 *)config)[1] = HIF_MBOX1_BLOCK_SIZE;
+            ((A_UINT32 *)config)[2] = HIF_MBOX2_BLOCK_SIZE;
+            ((A_UINT32 *)config)[3] = HIF_MBOX3_BLOCK_SIZE;
+            break;
+
+        case HIF_DEVICE_GET_MBOX_ADDR:
+            for (count = 0; count < 4; count ++) {
+                ((A_UINT32 *)config)[count] = HIF_MBOX_START_ADDR(count);
+            }
+            
+            if (configLen >= sizeof(HIF_DEVICE_MBOX_INFO)) {    
+                SetExtendedMboxWindowInfo((A_UINT16)device->func->device,
+                                          (HIF_DEVICE_MBOX_INFO *)config);
+            }
+                        
+            break;
+        case HIF_DEVICE_GET_IRQ_PROC_MODE:
+            *((HIF_DEVICE_IRQ_PROCESSING_MODE *)config) = HIF_DEVICE_IRQ_SYNC_ONLY;
+            break;
+        case HIF_DEVICE_GET_OS_DEVICE:
+                /* pass back a pointer to the SDIO function's "dev" struct */
+            ((HIF_DEVICE_OS_DEVICE_INFO *)config)->pOSDevice = &device->func->dev;
+            break; 
+        default:
+            AR_DEBUG_PRINTF(ATH_DEBUG_WARN,
+                            ("AR6000: Unsupported configuration opcode: %d\n", opcode));
+            return A_ERROR;
+    }
+
+    return A_OK;
+}
+
+void
+HIFShutDownDevice(HIF_DEVICE *device)
+{
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +HIFShutDownDevice\n"));
+    if (device != NULL) {
+        AR_DEBUG_ASSERT(device->func != NULL);
+    } else {
+            /* since we are unloading the driver anyways, reset all cards in case the SDIO card
+             * is externally powered and we are unloading the SDIO stack.  This avoids the problem when
+             * the SDIO stack is reloaded and attempts are made to re-enumerate a card that is already
+             * enumerated */
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFShutDownDevice, resetting\n"));
+        ResetAllCards();
+
+        /* Unregister with bus driver core */
+        if (registered) {
+            registered = 0;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Unregistering with the bus driver\n"));
+            sdio_unregister_driver(&ar6k_driver);
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Unregistered\n"));
+        }
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -HIFShutDownDevice\n"));
+}
+
+static void
+hifIRQHandler(struct sdio_func *func)
+{
+    A_STATUS status;
+    HIF_DEVICE *device;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +hifIRQHandler\n"));
+
+    device = getHifDevice(func);
+    /* release the host during ints so we can pick it back up when we process cmds */
+    sdio_release_host(device->func);
+    status = device->htcCallbacks.dsrHandler(device->htcCallbacks.context);
+    sdio_claim_host(device->func);
+    AR_DEBUG_ASSERT(status == A_OK);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -hifIRQHandler\n"));
+}
+
+/* handle HTC startup via thread*/
+static int startup_task(void *param)
+{
+    HIF_DEVICE *device;
+
+    device = (HIF_DEVICE *)param;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: call HTC from startup_task\n"));
+        /* start  up inform DRV layer */
+    if ((osdrvCallbacks.deviceInsertedHandler(osdrvCallbacks.context,device)) != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device rejected\n"));
+    }
+    return 0;
+}
+
+static int hifDeviceInserted(struct sdio_func *func, const struct sdio_device_id *id)
+{
+    int ret;
+    HIF_DEVICE * device;
+    int count;
+    struct task_struct* startup_task_struct;
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                    ("AR6000: hifDeviceInserted, Function: 0x%X, Vendor ID: 0x%X, Device ID: 0x%X, block size: 0x%X/0x%X\n",
+                     func->num, func->vendor, func->device, func->max_blksize, func->cur_blksize));
+
+    addHifDevice(func);
+    device = getHifDevice(func);
+
+    spin_lock_init(&device->lock);
+
+    spin_lock_init(&device->asynclock);
+    
+        /* enable the SDIO function */
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: claim\n"));
+    sdio_claim_host(func);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: enable\n"));
+    /* give us some time to enable, in ms */
+    func->enable_timeout = 100;
+    ret = sdio_enable_func(func);
+    if (ret) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), Unable to enable AR6K: 0x%X, timeout: %d\n",
+                                          __FUNCTION__, ret, func->enable_timeout)); 
+        sdio_release_host(func);
+        return ret;
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: set block size 0x%X\n", HIF_MBOX_BLOCK_SIZE));
+    ret = sdio_set_block_size(func, HIF_MBOX_BLOCK_SIZE);
+    sdio_release_host(func);
+    if (ret) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), Unable to set block size 0x%x  AR6K: 0x%X\n",
+                                          __FUNCTION__, HIF_MBOX_BLOCK_SIZE, ret));
+        sdio_release_host(func);
+        return ret;
+    }
+    /* Initialize the bus requests to be used later */
+    A_MEMZERO(device->busRequest, sizeof(device->busRequest));
+    for (count = 0; count < BUS_REQUEST_MAX_NUM; count ++) {
+        sema_init(&device->busRequest[count].sem_req, 0);
+        hifFreeBusRequest(device, &device->busRequest[count]);
+    }
+
+    /* create async I/O thread */
+    device->async_shutdown = 0;
+    device->async_task = kthread_create(async_task,
+                                       (void *)device,
+                                       "AR6K Async");
+    if (device->async_task == NULL) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), to create async task\n", __FUNCTION__));
+        sdio_release_host(func);
+        return A_ERROR;
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: start async task\n"));
+    sema_init(&device->sem_async, 0);
+    wake_up_process(device->async_task );
+
+    /* create startup thread */
+    startup_task_struct = kthread_create(startup_task,
+                                  (void *)device,
+                                  "AR6K startup");
+    if (startup_task_struct == NULL) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), to create startup task\n", __FUNCTION__));
+        sdio_release_host(func);
+        return A_ERROR;
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: start startup task\n"));
+    wake_up_process(startup_task_struct);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: return %d\n", ret));
+    return ret;
+}
+
+
+void
+HIFAckInterrupt(HIF_DEVICE *device)
+{
+    AR_DEBUG_ASSERT(device != NULL);
+
+    /* Acknowledge our function IRQ */
+}
+
+void
+HIFUnMaskInterrupt(HIF_DEVICE *device)
+{
+    int ret;;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFUnMaskInterrupt\n"));
+
+    /* Register the IRQ Handler */
+    sdio_claim_host(device->func);
+    ret = sdio_claim_irq(device->func, hifIRQHandler);
+    sdio_release_host(device->func);
+    AR_DEBUG_ASSERT(ret == 0);
+}
+
+void HIFMaskInterrupt(HIF_DEVICE *device)
+{
+    int ret;;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFMaskInterrupt\n"));
+
+    /* Mask our function IRQ */
+    sdio_claim_host(device->func);
+    ret = sdio_release_irq(device->func);
+    sdio_release_host(device->func);
+    AR_DEBUG_ASSERT(ret == 0);
+}
+
+static BUS_REQUEST *hifAllocateBusRequest(HIF_DEVICE *device)
+{
+    BUS_REQUEST *busrequest;
+    unsigned long flag;
+
+    /* Acquire lock */
+    spin_lock_irqsave(&device->lock, flag);
+
+    /* Remove first in list */
+    if((busrequest = device->s_busRequestFreeQueue) != NULL)
+    {
+        device->s_busRequestFreeQueue = busrequest->next;
+    }
+
+    /* Release lock */
+    spin_unlock_irqrestore(&device->lock, flag);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: hifAllocateBusRequest: 0x%p\n", busrequest));
+    return busrequest;
+}
+
+static void
+hifFreeBusRequest(HIF_DEVICE *device, BUS_REQUEST *busrequest)
+{
+    unsigned long flag;
+
+    AR_DEBUG_ASSERT(busrequest != NULL);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: hifFreeBusRequest: 0x%p\n", busrequest));
+    /* Acquire lock */
+    spin_lock_irqsave(&device->lock, flag);
+
+
+    /* Insert first in list */
+    busrequest->next = device->s_busRequestFreeQueue;
+    busrequest->inusenext = NULL;
+    device->s_busRequestFreeQueue = busrequest;
+
+    /* Release lock */
+    spin_unlock_irqrestore(&device->lock, flag);
+}
+
+static void hifDeviceRemoved(struct sdio_func *func)
+{
+    A_STATUS status = A_OK;
+    HIF_DEVICE *device;
+    int ret;
+    AR_DEBUG_ASSERT(func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +hifDeviceRemoved\n"));
+    device = getHifDevice(func);
+    if (device->claimedContext != NULL) {
+        status = osdrvCallbacks.deviceRemovedHandler(device->claimedContext, device);
+    }
+
+    if (device->async_task != NULL) {
+        init_completion(&device->async_completion);
+        device->async_shutdown = 1;
+        up(&device->sem_async);
+        wait_for_completion(&device->async_completion);
+        device->async_task = NULL;
+    }
+    /* Disable the card */
+    sdio_claim_host(device->func);
+    ret = sdio_disable_func(device->func);
+
+    if (reset_sdio_on_unload) {
+        int ret;
+        /* reset the SDIO interface.  This is useful in automated testing where the card
+         * does not need to be removed at the end of the test.  It is expected that the user will 
+         * also unload/reload the host controller driver to force the bus driver to re-enumerate the slot */
+        AR_DEBUG_PRINTF(ATH_DEBUG_WARN, ("AR6000: reseting SDIO card back to uninitialized state \n"));
+        
+        /* NOTE : sdio_f0_writeb() cannot be used here, that API only allows access
+         *        to undefined registers in the range of: 0xF0-0xFF */
+         
+        ret = Func0_CMD52WriteByte(device->func->card, SDIO_CCCR_ABORT, (1 << 3)); 
+        if (ret) {
+             AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("AR6000: reset failed : %d \n",ret));    
+        }
+    }
+
+    sdio_release_host(device->func);
+    delHifDevice(device);
+    AR_DEBUG_ASSERT(status == A_OK);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -hifDeviceRemoved\n"));
+}
+
+
+static HIF_DEVICE *
+addHifDevice(struct sdio_func *func)
+{
+    HIF_DEVICE *hifdevice;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: addHifDevice\n"));
+    AR_DEBUG_ASSERT(func != NULL);
+    hifdevice = (HIF_DEVICE *)kzalloc(sizeof(HIF_DEVICE), GFP_KERNEL);
+    AR_DEBUG_ASSERT(hifdevice != NULL);
+#if HIF_USE_DMA_BOUNCE_BUFFER
+    hifdevice->dma_buffer = kmalloc(HIF_DMA_BUFFER_SIZE, GFP_KERNEL);
+    AR_DEBUG_ASSERT(hifdevice->dma_buffer != NULL);
+#endif
+    hifdevice->func = func;
+    sdio_set_drvdata(func, hifdevice);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: addHifDevice; 0x%p\n", hifdevice));
+    return hifdevice;
+}
+
+static HIF_DEVICE *
+getHifDevice(struct sdio_func *func)
+{
+    AR_DEBUG_ASSERT(func != NULL);
+    return (HIF_DEVICE *)sdio_get_drvdata(func);
+}
+
+static void
+delHifDevice(HIF_DEVICE * device)
+{
+    AR_DEBUG_ASSERT(device!= NULL);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: delHifDevice; 0x%p\n", device));
+    if (device->dma_buffer != NULL) {
+        kfree(device->dma_buffer);
+    }
+    kfree(device);
+}
+
+static void ResetAllCards(void)
+{
+}
+
+void HIFClaimDevice(HIF_DEVICE  *device, void *context)
+{
+    device->claimedContext = context;
+}
+
+void HIFReleaseDevice(HIF_DEVICE  *device)
+{
+    device->claimedContext = NULL;
+}
+
+A_STATUS HIFAttachHTC(HIF_DEVICE *device, HTC_CALLBACKS *callbacks)
+{
+    if (device->htcCallbacks.context != NULL) {
+            /* already in use! */
+        return A_ERROR;
+    }
+    device->htcCallbacks = *callbacks;
+    return A_OK;
+}
+
+void HIFDetachHTC(HIF_DEVICE *device)
+{
+    A_MEMZERO(&device->htcCallbacks,sizeof(device->htcCallbacks));
+}
+
+#define SDIO_SET_CMD52_ARG(arg,rw,func,raw,address,writedata) \
+    (arg) = (((rw) & 1) << 31)           | \
+            (((func) & 0x7) << 28)       | \
+            (((raw) & 1) << 27)          | \
+            (1 << 26)                    | \
+            (((address) & 0x1FFFF) << 9) | \
+            (1 << 8)                     | \
+            ((writedata) & 0xFF)
+            
+#define SDIO_SET_CMD52_READ_ARG(arg,func,address) \
+    SDIO_SET_CMD52_ARG(arg,0,(func),0,address,0x00)
+#define SDIO_SET_CMD52_WRITE_ARG(arg,func,address,value) \
+    SDIO_SET_CMD52_ARG(arg,1,(func),0,address,value)
+    
+static int Func0_CMD52WriteByte(struct mmc_card *card, unsigned int address, unsigned char byte)
+{
+    struct mmc_command ioCmd;
+    unsigned long      arg;
+    
+    memset(&ioCmd,0,sizeof(ioCmd));
+    SDIO_SET_CMD52_WRITE_ARG(arg,0,address,byte);
+    ioCmd.opcode = SD_IO_RW_DIRECT;
+    ioCmd.arg = arg;
+    ioCmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
+    
+    return mmc_wait_for_cmd(card->host, &ioCmd, 0);
+}
+
+
+
+