Add ar6000 wireless driver.

2 files changed, 702 insertions, 0 deletions

diff --git a/drivers/ar6000/bmi/bmi.c b/drivers/ar6000/bmi/bmi.c
new file mode 100644
index 00000000000..d7b610c153e
--- /dev/null
+++ b/drivers/ar6000/bmi/bmi.c
@@ -0,0 +1,657 @@
+/*
+ * Copyright (c) 2004-2007 Atheros Communications Inc.
+ * 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.
+ *
+ *
+ *
+ */
+
+#include "hif.h"
+#include "bmi.h"
+#include "htc_api.h"
+#include "bmi_internal.h"
+
+/*
+Although we had envisioned BMI to run on top of HTC, this is not what the
+final implementation boiled down to on dragon. Its a part of BSP and does
+not use the HTC protocol either. On the host side, however, we were still
+living with the original idea. I think the time has come to accept the truth
+and separate it from HTC which has been carrying BMI's burden all this while.
+It shall make HTC state machine relatively simpler
+*/
+
+/* APIs visible to the driver */
+void
+BMIInit(void)
+{
+    bmiDone = FALSE;
+}
+
+A_STATUS
+BMIDone(HIF_DEVICE *device)
+{
+    A_STATUS status;
+    A_UINT32 cid;
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF (ATH_DEBUG_BMI, ("BMIDone skipped\n"));
+        return A_OK;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Done: Enter (device: 0x%p)\n", device));
+    bmiDone = TRUE;
+    cid = BMI_DONE;
+
+    status = bmiBufferSend(device, (A_UCHAR *)&cid, sizeof(cid));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Done: Exit\n"));
+
+    return A_OK;
+}
+
+A_STATUS
+BMIGetTargetInfo(HIF_DEVICE *device, struct bmi_target_info *targ_info)
+{
+    A_STATUS status;
+    A_UINT32 cid;
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Get Target Info: Enter (device: 0x%p)\n", device));
+    cid = BMI_GET_TARGET_INFO;
+
+    status = bmiBufferSend(device, (A_UCHAR *)&cid, sizeof(cid));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    status = bmiBufferReceive(device, (A_UCHAR *)&targ_info->target_ver,
+                                                sizeof(targ_info->target_ver));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Version from the device\n"));
+        return A_ERROR;
+    }
+
+    if (targ_info->target_ver == TARGET_VERSION_SENTINAL) {
+        /* Determine how many bytes are in the Target's targ_info */
+        status = bmiBufferReceive(device, (A_UCHAR *)&targ_info->target_info_byte_count,
+                                            sizeof(targ_info->target_info_byte_count));
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Info Byte Count from the device\n"));
+            return A_ERROR;
+        }
+
+        /*
+         * The Target's targ_info doesn't match the Host's targ_info.
+         * We need to do some backwards compatibility work to make this OK.
+         */
+        A_ASSERT(targ_info->target_info_byte_count == sizeof(*targ_info));
+
+        /* Read the remainder of the targ_info */
+        status = bmiBufferReceive(device,
+                        ((A_UCHAR *)targ_info)+sizeof(targ_info->target_info_byte_count),
+                        sizeof(*targ_info)-sizeof(targ_info->target_info_byte_count));
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Info (%d bytes) from the device\n",
+                        					targ_info->target_info_byte_count));
+            return A_ERROR;
+        }
+    } else {
+        /*
+         * Target must be an AR6001 whose firmware does not
+         * support BMI_GET_TARGET_INFO.  Construct the data
+         * that it would have sent.
+         */
+        targ_info->target_info_byte_count = sizeof(targ_info);
+        targ_info->target_type = TARGET_TYPE_AR6001;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Get Target Info: Exit (ver: 0x%x type: 0x%x)\n",
+        							targ_info->target_ver, targ_info->target_type));
+    printk("BMI Get Target Info: Exit (ver: 0x%x type: 0x%x)\n",
+	   targ_info->target_ver, targ_info->target_type);
+
+    return A_OK;
+}
+
+A_STATUS
+BMIReadMemory(HIF_DEVICE *device,
+              A_UINT32 address,
+              A_UCHAR *buffer,
+              A_UINT32 length)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    A_UINT32 remaining, rxlen;
+    static A_UCHAR data[BMI_DATASZ_MAX + sizeof(cid) + sizeof(address) + sizeof(length)];
+    memset (&data, 0, BMI_DATASZ_MAX + sizeof(cid) + sizeof(address) + sizeof(length));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+       			("BMI Read Memory: Enter (device: 0x%p, address: 0x%x, length: %d)\n",
+        			device, address, length));
+
+    cid = BMI_READ_MEMORY;
+
+    remaining = length;
+
+    while (remaining)
+    {
+        rxlen = (remaining < BMI_DATASZ_MAX) ? remaining : BMI_DATASZ_MAX;
+        offset = 0;
+        A_MEMCPY(&data[offset], &cid, sizeof(cid));
+        offset += sizeof(cid);
+        A_MEMCPY(&data[offset], &address, sizeof(address));
+        offset += sizeof(address);
+        A_MEMCPY(&data[offset], &rxlen, sizeof(rxlen));
+        offset += sizeof(length);
+
+        status = bmiBufferSend(device, data, offset);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+            return A_ERROR;
+        }
+        status = bmiBufferReceive(device, data, rxlen);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read from the device\n"));
+            return A_ERROR;
+        }
+        A_MEMCPY(&buffer[length - remaining], data, rxlen);
+        remaining -= rxlen; address += rxlen;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Read Memory: Exit\n"));
+    return A_OK;
+}
+
+A_STATUS
+BMIWriteMemory(HIF_DEVICE *device,
+               A_UINT32 address,
+               A_UCHAR *buffer,
+               A_UINT32 length)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    A_UINT32 remaining, txlen;
+    const A_UINT32 header = sizeof(cid) + sizeof(address) + sizeof(length);
+    static A_UCHAR data[BMI_DATASZ_MAX + sizeof(cid) + sizeof(address) + sizeof(length)];
+	memset (&data, 0, header);
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+         ("BMI Write Memory: Enter (device: 0x%p, address: 0x%x, length: %d)\n",
+         device, address, length));
+
+    cid = BMI_WRITE_MEMORY;
+
+    remaining = length;
+    while (remaining)
+    {
+        txlen = (remaining < (BMI_DATASZ_MAX - header)) ?
+                                       remaining : (BMI_DATASZ_MAX - header);
+        offset = 0;
+        A_MEMCPY(&data[offset], &cid, sizeof(cid));
+        offset += sizeof(cid);
+        A_MEMCPY(&data[offset], &address, sizeof(address));
+        offset += sizeof(address);
+        A_MEMCPY(&data[offset], &txlen, sizeof(txlen));
+        offset += sizeof(txlen);
+        A_MEMCPY(&data[offset], &buffer[length - remaining], txlen);
+        offset += txlen;
+        status = bmiBufferSend(device, data, offset);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+            return A_ERROR;
+        }
+        remaining -= txlen; address += txlen;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Write Memory: Exit\n"));
+
+    return A_OK;
+}
+
+A_STATUS
+BMIExecute(HIF_DEVICE *device,
+           A_UINT32 address,
+           A_UINT32 *param)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(address) + sizeof(*param)];
+    memset (&data, 0, sizeof(cid) + sizeof(address) + sizeof(*param));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+       ("BMI Execute: Enter (device: 0x%p, address: 0x%x, param: %d)\n",
+        device, address, *param));
+
+    cid = BMI_EXECUTE;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &address, sizeof(address));
+    offset += sizeof(address);
+    A_MEMCPY(&data[offset], param, sizeof(*param));
+    offset += sizeof(*param);
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    status = bmiBufferReceive(device, data, sizeof(*param));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read from the device\n"));
+        return A_ERROR;
+    }
+
+    A_MEMCPY(param, data, sizeof(*param));
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Execute: Exit (param: %d)\n", *param));
+    return A_OK;
+}
+
+A_STATUS
+BMISetAppStart(HIF_DEVICE *device,
+               A_UINT32 address)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(address)];
+    memset (&data, 0, sizeof(cid) + sizeof(address));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+       ("BMI Set App Start: Enter (device: 0x%p, address: 0x%x)\n",
+        device, address));
+
+    cid = BMI_SET_APP_START;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &address, sizeof(address));
+    offset += sizeof(address);
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Set App Start: Exit\n"));
+    return A_OK;
+}
+
+A_STATUS
+BMIReadSOCRegister(HIF_DEVICE *device,
+                   A_UINT32 address,
+                   A_UINT32 *param)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(address)];
+    memset (&data, 0, sizeof(cid) + sizeof(address));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+       ("BMI Read SOC Register: Enter (device: 0x%p, address: 0x%x)\n",
+       device, address));
+
+    cid = BMI_READ_SOC_REGISTER;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &address, sizeof(address));
+    offset += sizeof(address);
+
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    status = bmiBufferReceive(device, data, sizeof(*param));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read from the device\n"));
+        return A_ERROR;
+    }
+    A_MEMCPY(param, data, sizeof(*param));
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Read SOC Register: Exit (value: %d)\n", *param));
+    return A_OK;
+}
+
+A_STATUS
+BMIWriteSOCRegister(HIF_DEVICE *device,
+                    A_UINT32 address,
+                    A_UINT32 param)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(address) + sizeof(param)];
+
+    memset (&data, 0, sizeof(cid) + sizeof(address) + sizeof(param));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+     ("BMI Write SOC Register: Enter (device: 0x%p, address: 0x%x, param: %d)\n",
+     device, address, param));
+
+    cid = BMI_WRITE_SOC_REGISTER;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &address, sizeof(address));
+    offset += sizeof(address);
+    A_MEMCPY(&data[offset], &param, sizeof(param));
+    offset += sizeof(param);
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Read SOC Register: Exit\n"));
+    return A_OK;
+}
+
+A_STATUS
+BMIrompatchInstall(HIF_DEVICE *device,
+                   A_UINT32 ROM_addr,
+                   A_UINT32 RAM_addr,
+                   A_UINT32 nbytes,
+                   A_UINT32 do_activate,
+                   A_UINT32 *rompatch_id)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(ROM_addr) + sizeof(RAM_addr) +
+                                sizeof(nbytes) + sizeof(do_activate)];
+
+	memset (&data, 0, sizeof(cid) + sizeof(ROM_addr) + sizeof(RAM_addr) +
+                      sizeof(nbytes) + sizeof(do_activate));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+         ("BMI rompatch Install: Enter (device: 0x%p, ROMaddr: 0x%x, RAMaddr: 0x%x length: %d activate: %d)\n",
+         device, ROM_addr, RAM_addr, nbytes, do_activate));
+
+    cid = BMI_ROMPATCH_INSTALL;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &ROM_addr, sizeof(ROM_addr));
+    offset += sizeof(ROM_addr);
+    A_MEMCPY(&data[offset], &RAM_addr, sizeof(RAM_addr));
+    offset += sizeof(RAM_addr);
+    A_MEMCPY(&data[offset], &nbytes, sizeof(nbytes));
+    offset += sizeof(nbytes);
+    A_MEMCPY(&data[offset], &do_activate, sizeof(do_activate));
+    offset += sizeof(do_activate);
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    status = bmiBufferReceive(device, (A_UCHAR *)rompatch_id, sizeof(*rompatch_id));
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read from the device\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI rompatch Install: (rompatch_id=%d)\n", *rompatch_id));
+    return A_OK;
+}
+
+A_STATUS
+BMIrompatchUninstall(HIF_DEVICE *device,
+                     A_UINT32 rompatch_id)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[sizeof(cid) + sizeof(rompatch_id)];
+    memset (&data, 0, sizeof(cid) + sizeof(rompatch_id));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+         ("BMI rompatch Uninstall: Enter (device: 0x%p, rompatch_id: %d)\n",
+         								 device, rompatch_id));
+
+    cid = BMI_ROMPATCH_UNINSTALL;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &rompatch_id, sizeof(rompatch_id));
+    offset += sizeof(rompatch_id);
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI rompatch UNinstall: (rompatch_id=0x%x)\n", rompatch_id));
+    return A_OK;
+}
+
+static A_STATUS
+_BMIrompatchChangeActivation(HIF_DEVICE *device,
+                             A_UINT32 rompatch_count,
+                             A_UINT32 *rompatch_list,
+                             A_UINT32 do_activate)
+{
+    A_UINT32 cid;
+    A_STATUS status;
+    A_UINT32 offset;
+    static A_UCHAR data[BMI_DATASZ_MAX + sizeof(cid) + sizeof(rompatch_count)];
+    A_UINT32 length;
+
+	memset (&data, 0, BMI_DATASZ_MAX + sizeof(cid) + sizeof(rompatch_count));
+
+    if (bmiDone) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Command disallowed\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI,
+         ("BMI Change rompatch Activation: Enter (device: 0x%p, count: %d)\n",
+           device, rompatch_count));
+
+    cid = do_activate ? BMI_ROMPATCH_ACTIVATE : BMI_ROMPATCH_DEACTIVATE;
+
+    offset = 0;
+    A_MEMCPY(&data[offset], &cid, sizeof(cid));
+    offset += sizeof(cid);
+    A_MEMCPY(&data[offset], &rompatch_count, sizeof(rompatch_count));
+    offset += sizeof(rompatch_count);
+    length = rompatch_count * sizeof(*rompatch_list);
+    A_MEMCPY(&data[offset], rompatch_list, length);
+    offset += length;
+    status = bmiBufferSend(device, data, offset);
+    if (status != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
+        return A_ERROR;
+    }
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Change rompatch Activation: Exit\n"));
+
+    return A_OK;
+}
+
+A_STATUS
+BMIrompatchActivate(HIF_DEVICE *device,
+                    A_UINT32 rompatch_count,
+                    A_UINT32 *rompatch_list)
+{
+    return _BMIrompatchChangeActivation(device, rompatch_count, rompatch_list, 1);
+}
+
+A_STATUS
+BMIrompatchDeactivate(HIF_DEVICE *device,
+                      A_UINT32 rompatch_count,
+                      A_UINT32 *rompatch_list)
+{
+    return _BMIrompatchChangeActivation(device, rompatch_count, rompatch_list, 0);
+}
+
+/* BMI Access routines */
+A_STATUS
+bmiBufferSend(HIF_DEVICE *device,
+              A_UCHAR *buffer,
+              A_UINT32 length)
+{
+    A_STATUS status;
+    A_UINT32 timeout;
+    A_UINT32 address;
+    static A_UINT32 cmdCredits;
+    A_UINT32 mboxAddress[HTC_MAILBOX_NUM_MAX];
+
+    HIFConfigureDevice(device, HIF_DEVICE_GET_MBOX_ADDR,
+                       &mboxAddress, sizeof(mboxAddress));
+
+    cmdCredits = 0;
+    timeout = BMI_COMMUNICATION_TIMEOUT;
+
+    while(timeout-- && !cmdCredits) {
+        /* Read the counter register to get the command credits */
+        address = COUNT_DEC_ADDRESS + (HTC_MAILBOX_NUM_MAX + ENDPOINT1) * 4;
+        /* 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 */
+        status = HIFReadWrite(device, address, (A_UINT8 *)&cmdCredits, 4,
+            HIF_RD_SYNC_BYTE_INC, NULL);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to decrement the command credit count register\n"));
+            return A_ERROR;
+        }
+        /* the counter is only 8=bits, ignore anything in the upper 3 bytes */
+        cmdCredits &= 0xFF;
+    }
+
+    if (cmdCredits) {
+        address = mboxAddress[ENDPOINT1];
+        status = HIFReadWrite(device, address, buffer, length,
+            HIF_WR_SYNC_BYTE_INC, NULL);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to send the BMI data to the device\n"));
+            return A_ERROR;
+        }
+    } else {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI Communication timeout\n"));
+        return A_ERROR;
+    }
+
+    return status;
+}
+
+A_STATUS
+bmiBufferReceive(HIF_DEVICE *device,
+                 A_UCHAR *buffer,
+                 A_UINT32 length)
+{
+    A_STATUS status;
+    A_UINT32 address;
+    A_UINT32 timeout;
+    static A_UINT32 cmdCredits;
+    A_UINT32 mboxAddress[HTC_MAILBOX_NUM_MAX];
+
+    HIFConfigureDevice(device, HIF_DEVICE_GET_MBOX_ADDR,
+                       &mboxAddress, sizeof(mboxAddress));
+
+    cmdCredits = 0;
+    timeout = BMI_COMMUNICATION_TIMEOUT;
+    while(timeout-- && !cmdCredits) {
+        /* Read the counter register to get the command credits */
+        address = COUNT_ADDRESS + (HTC_MAILBOX_NUM_MAX + ENDPOINT1) * 1;
+        /* read the counter using a 4-byte read.  Since the counter is NOT auto-decrementing,
+         * we can read this counter multiple times using a non-incrementing address mode.
+         * The rationale here is to make all HIF accesses a multiple of 4 bytes */
+        status = HIFReadWrite(device, address, (A_UINT8 *)&cmdCredits, sizeof(cmdCredits),
+            HIF_RD_SYNC_BYTE_FIX, NULL);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read the command credit count register\n"));
+            return A_ERROR;
+        }
+            /* we did a 4-byte read to the same count register so mask off upper bytes */
+        cmdCredits &= 0xFF;
+        status = A_ERROR;
+    }
+
+    if (cmdCredits) {
+        address = mboxAddress[ENDPOINT1];
+        status = HIFReadWrite(device, address, buffer, length,
+            HIF_RD_SYNC_BYTE_INC, NULL);
+        if (status != A_OK) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read the BMI data from the device\n"));
+            return A_ERROR;
+        }
+    } else {
+        AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Communication timeout\n"));
+        return A_ERROR;
+    }
+
+    return status;
+}
diff --git a/drivers/ar6000/bmi/bmi_internal.h b/drivers/ar6000/bmi/bmi_internal.h
new file mode 100644
index 00000000000..1e213540c76
--- /dev/null
+++ b/drivers/ar6000/bmi/bmi_internal.h
@@ -0,0 +1,45 @@
+#ifndef BMI_INTERNAL_H
+#define BMI_INTERNAL_H
+/*
+ *
+ * Copyright (c) 2004-2007 Atheros Communications Inc.
+ * 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.
+ *
+ *
+ *
+ */
+
+#include "a_config.h"
+#include "athdefs.h"
+#include "a_types.h"
+#include "a_osapi.h"
+#include "a_debug.h"
+#include "AR6Khwreg.h"
+#include "bmi_msg.h"
+
+#define BMI_COMMUNICATION_TIMEOUT       100000
+
+/* ------ Global Variable Declarations ------- */
+A_BOOL bmiDone;
+
+A_STATUS
+bmiBufferSend(HIF_DEVICE *device,
+              A_UCHAR *buffer,
+              A_UINT32 length);
+
+A_STATUS
+bmiBufferReceive(HIF_DEVICE *device,
+                 A_UCHAR *buffer,
+                 A_UINT32 length);
+
+#endif