383 lines
15 KiB
C
383 lines
15 KiB
C
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//------------------------------------------------------------------------------
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// ISC License (ISC)
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//
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// Copyright (c) 2010, The Linux Foundation
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// All rights reserved.
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// Software was previously licensed under ISC license by Qualcomm Atheros, Inc.
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//
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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//
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//------------------------------------------------------------------------------
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//==============================================================================
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// common BMI access handling for register-based HIFs
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// This module implements BMI message exchanges on behalf of the BMI module for
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// HIFs that are based on a register access model
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//
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// Author(s): ="Atheros"
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//==============================================================================
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#include "a_config.h"
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#include "athdefs.h"
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#include "a_types.h"
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#include "a_osapi.h"
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#define ATH_MODULE_NAME bmi
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#include "a_debug.h"
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#define ATH_DEBUG_BMI ATH_DEBUG_MAKE_MODULE_MASK(0)
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#include "hif.h"
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#include "bmi.h"
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#include "htc_api.h"
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#include "target_reg_table.h"
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#include "host_reg_table.h"
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#define BMI_COMMUNICATION_TIMEOUT 100000
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static A_BOOL pendingEventsFuncCheck = FALSE;
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static A_UINT32 commandCredits = 0;
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static A_UINT32 *pBMICmdCredits = &commandCredits;
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/* BMI Access routines */
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static A_STATUS
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bmiBufferSend(HIF_DEVICE *device,
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A_UCHAR *buffer,
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A_UINT32 length)
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{
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A_STATUS status;
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A_UINT32 timeout;
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A_UINT32 address;
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A_UINT32 mboxAddress[HTC_MAILBOX_NUM_MAX];
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HIFConfigureDevice(device, HIF_DEVICE_GET_MBOX_ADDR,
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&mboxAddress[0], sizeof(mboxAddress));
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*pBMICmdCredits = 0;
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timeout = BMI_COMMUNICATION_TIMEOUT;
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while(timeout-- && !(*pBMICmdCredits)) {
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/* Read the counter register to get the command credits */
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address = COUNT_DEC_ADDRESS + (HTC_MAILBOX_NUM_MAX + ENDPOINT1) * 4;
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/* hit the credit counter with a 4-byte access, the first byte read will hit the counter and cause
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* a decrement, while the remaining 3 bytes has no effect. The rationale behind this is to
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* make all HIF accesses 4-byte aligned */
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status = HIFReadWrite(device, address, (A_UINT8 *)pBMICmdCredits, 4,
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HIF_RD_SYNC_BYTE_INC, NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to decrement the command credit count register\n"));
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return A_ERROR;
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}
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/* the counter is only 8=bits, ignore anything in the upper 3 bytes */
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(*pBMICmdCredits) &= 0xFF;
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}
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if (*pBMICmdCredits) {
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address = mboxAddress[ENDPOINT1];
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status = HIFReadWrite(device, address, buffer, length,
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HIF_WR_SYNC_BYTE_INC, NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to send the BMI data to the device\n"));
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return A_ERROR;
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}
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} else {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI Communication timeout - bmiBufferSend\n"));
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return A_ERROR;
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}
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return status;
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}
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static A_STATUS
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bmiBufferReceive(HIF_DEVICE *device,
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A_UCHAR *buffer,
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A_UINT32 length,
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A_BOOL want_timeout)
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{
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A_STATUS status;
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A_UINT32 address;
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A_UINT32 mboxAddress[HTC_MAILBOX_NUM_MAX];
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HIF_PENDING_EVENTS_INFO hifPendingEvents;
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static HIF_PENDING_EVENTS_FUNC getPendingEventsFunc = NULL;
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if (!pendingEventsFuncCheck) {
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/* see if the HIF layer implements an alternative function to get pending events
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* do this only once! */
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HIFConfigureDevice(device,
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HIF_DEVICE_GET_PENDING_EVENTS_FUNC,
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&getPendingEventsFunc,
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sizeof(HIF_PENDING_EVENTS_FUNC));
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pendingEventsFuncCheck = TRUE;
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}
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HIFConfigureDevice(device, HIF_DEVICE_GET_MBOX_ADDR,
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&mboxAddress[0], sizeof(mboxAddress));
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/*
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* During normal bootup, small reads may be required.
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* Rather than issue an HIF Read and then wait as the Target
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* adds successive bytes to the FIFO, we wait here until
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* we know that response data is available.
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*
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* This allows us to cleanly timeout on an unexpected
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* Target failure rather than risk problems at the HIF level. In
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* particular, this avoids SDIO timeouts and possibly garbage
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* data on some host controllers. And on an interconnect
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* such as Compact Flash (as well as some SDIO masters) which
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* does not provide any indication on data timeout, it avoids
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* a potential hang or garbage response.
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*
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* Synchronization is more difficult for reads larger than the
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* size of the MBOX FIFO (128B), because the Target is unable
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* to push the 129th byte of data until AFTER the Host posts an
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* HIF Read and removes some FIFO data. So for large reads the
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* Host proceeds to post an HIF Read BEFORE all the data is
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* actually available to read. Fortunately, large BMI reads do
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* not occur in practice -- they're supported for debug/development.
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*
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* So Host/Target BMI synchronization is divided into these cases:
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* CASE 1: length < 4
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* Should not happen
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*
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* CASE 2: 4 <= length <= 128
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* Wait for first 4 bytes to be in FIFO
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* If CONSERVATIVE_BMI_READ is enabled, also wait for
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* a BMI command credit, which indicates that the ENTIRE
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* response is available in the the FIFO
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*
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* CASE 3: length > 128
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* Wait for the first 4 bytes to be in FIFO
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*
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* For most uses, a small timeout should be sufficient and we will
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* usually see a response quickly; but there may be some unusual
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* (debug) cases of BMI_EXECUTE where we want an larger timeout.
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* For now, we use an unbounded busy loop while waiting for
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* BMI_EXECUTE.
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*
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* If BMI_EXECUTE ever needs to support longer-latency execution,
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* especially in production, this code needs to be enhanced to sleep
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* and yield. Also note that BMI_COMMUNICATION_TIMEOUT is currently
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* a function of Host processor speed.
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*/
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if (length >= 4) { /* NB: Currently, always true */
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/*
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* NB: word_available is declared static for esoteric reasons
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* having to do with protection on some OSes.
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*/
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static A_UINT32 word_available;
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A_UINT32 timeout;
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word_available = 0;
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timeout = BMI_COMMUNICATION_TIMEOUT;
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while((!want_timeout || timeout--) && !word_available) {
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if (getPendingEventsFunc != NULL) {
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status = getPendingEventsFunc(device,
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&hifPendingEvents,
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NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("BMI: Failed to get pending events \n"));
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break;
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}
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if (hifPendingEvents.AvailableRecvBytes >= sizeof(A_UINT32)) {
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word_available = 1;
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}
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continue;
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}
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status = HIFReadWrite(device, RX_LOOKAHEAD_VALID_ADDRESS, (A_UINT8 *)&word_available,
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sizeof(word_available), HIF_RD_SYNC_BYTE_INC, NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read RX_LOOKAHEAD_VALID register\n"));
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return A_ERROR;
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}
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/* We did a 4-byte read to the same register; all we really want is one bit */
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word_available &= (1 << ENDPOINT1);
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}
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if (!word_available) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI Communication timeout - bmiBufferReceive FIFO empty\n"));
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return A_ERROR;
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}
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}
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#define CONSERVATIVE_BMI_READ 0
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#if CONSERVATIVE_BMI_READ
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/*
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* This is an extra-conservative CREDIT check. It guarantees
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* that ALL data is available in the FIFO before we start to
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* read from the interconnect.
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*
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* This credit check is useless when firmware chooses to
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* allow multiple outstanding BMI Command Credits, since the next
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* credit will already be present. To restrict the Target to one
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* BMI Command Credit, see HI_OPTION_BMI_CRED_LIMIT.
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*
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* And for large reads (when HI_OPTION_BMI_CRED_LIMIT is set)
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* we cannot wait for the next credit because the Target's FIFO
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* will not hold the entire response. So we need the Host to
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* start to empty the FIFO sooner. (And again, large reads are
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* not used in practice; they are for debug/development only.)
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*
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* For a more conservative Host implementation (which would be
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* safer for a Compact Flash interconnect):
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* Set CONSERVATIVE_BMI_READ (above) to 1
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* Set HI_OPTION_BMI_CRED_LIMIT and
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* reduce BMI_DATASZ_MAX to 32 or 64
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*/
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if ((length > 4) && (length < 128)) { /* check against MBOX FIFO size */
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A_UINT32 timeout;
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*pBMICmdCredits = 0;
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timeout = BMI_COMMUNICATION_TIMEOUT;
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while((!want_timeout || timeout--) && !(*pBMICmdCredits)) {
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/* Read the counter register to get the command credits */
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address = COUNT_ADDRESS + (HTC_MAILBOX_NUM_MAX + ENDPOINT1) * 1;
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/* read the counter using a 4-byte read. Since the counter is NOT auto-decrementing,
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* we can read this counter multiple times using a non-incrementing address mode.
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* The rationale here is to make all HIF accesses a multiple of 4 bytes */
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status = HIFReadWrite(device, address, (A_UINT8 *)pBMICmdCredits, sizeof(*pBMICmdCredits),
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HIF_RD_SYNC_BYTE_FIX, NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read the command credit count register\n"));
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return A_ERROR;
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}
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/* we did a 4-byte read to the same count register so mask off upper bytes */
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(*pBMICmdCredits) &= 0xFF;
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}
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if (!(*pBMICmdCredits)) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI Communication timeout- bmiBufferReceive no credit\n"));
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return A_ERROR;
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}
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}
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#endif
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address = mboxAddress[ENDPOINT1];
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status = HIFReadWrite(device, address, buffer, length, HIF_RD_SYNC_BYTE_INC, NULL);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read the BMI data from the device\n"));
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return A_ERROR;
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}
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return A_OK;
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}
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A_STATUS HIFRegBasedGetTargetInfo(HIF_DEVICE *device, struct bmi_target_info *targ_info)
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{
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A_STATUS status;
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A_UINT32 cid;
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AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Get Target Info: Enter (device: 0x%p)\n", device));
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cid = BMI_GET_TARGET_INFO;
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status = bmiBufferSend(device, (A_UCHAR *)&cid, sizeof(cid));
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to write to the device\n"));
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return A_ERROR;
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}
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status = bmiBufferReceive(device, (A_UCHAR *)&targ_info->target_ver,
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sizeof(targ_info->target_ver), TRUE);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Version from the device\n"));
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return A_ERROR;
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}
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if (targ_info->target_ver == TARGET_VERSION_SENTINAL) {
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/* Determine how many bytes are in the Target's targ_info */
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status = bmiBufferReceive(device, (A_UCHAR *)&targ_info->target_info_byte_count,
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sizeof(targ_info->target_info_byte_count), TRUE);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Info Byte Count from the device\n"));
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return A_ERROR;
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}
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/*
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* The Target's targ_info doesn't match the Host's targ_info.
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* We need to do some backwards compatibility work to make this OK.
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*/
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A_ASSERT(targ_info->target_info_byte_count == sizeof(*targ_info));
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/* Read the remainder of the targ_info */
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status = bmiBufferReceive(device,
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((A_UCHAR *)targ_info)+sizeof(targ_info->target_info_byte_count),
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sizeof(*targ_info)-sizeof(targ_info->target_info_byte_count), TRUE);
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if (status != A_OK) {
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AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Unable to read Target Info (%d bytes) from the device\n",
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targ_info->target_info_byte_count));
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return A_ERROR;
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}
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} else {
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/*
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* Target must be an AR6001 whose firmware does not
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* support BMI_GET_TARGET_INFO. Construct the data
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* that it would have sent.
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*/
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targ_info->target_info_byte_count=sizeof(*targ_info);
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targ_info->target_type=TARGET_TYPE_AR6001;
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}
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AR_DEBUG_PRINTF(ATH_DEBUG_BMI, ("BMI Get Target Info: Exit (ver: 0x%x type: 0x%x)\n",
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targ_info->target_ver, targ_info->target_type));
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return A_OK;
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}
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A_STATUS HIFExchangeBMIMsg(HIF_DEVICE *device,
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A_UINT8 *pSendMessage,
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A_UINT32 Length,
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A_UINT8 *pResponseMessage,
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A_UINT32 *pResponseLength,
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A_UINT32 TimeoutMS)
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{
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A_STATUS status = A_OK;
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do {
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status = bmiBufferSend(device, pSendMessage, Length);
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if (A_FAILED(status)) {
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||
|
|
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI : Unable to Send Message to device \n"));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pResponseMessage != NULL) {
|
||
|
|
status = bmiBufferReceive(device, pResponseMessage, *pResponseLength, TimeoutMS ? TRUE : FALSE);
|
||
|
|
if (A_FAILED(status)) {
|
||
|
|
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("BMI : Unable to read response from device \n"));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
} while (FALSE);
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* TODO .. the following APIs are a relic of the old register based interface */
|
||
|
|
|
||
|
|
A_STATUS
|
||
|
|
BMIRawWrite(HIF_DEVICE *device, A_UCHAR *buffer, A_UINT32 length)
|
||
|
|
{
|
||
|
|
return bmiBufferSend(device, buffer, length);
|
||
|
|
}
|
||
|
|
|
||
|
|
A_STATUS
|
||
|
|
BMIRawRead(HIF_DEVICE *device, A_UCHAR *buffer, A_UINT32 length, A_BOOL want_timeout)
|
||
|
|
{
|
||
|
|
return bmiBufferReceive(device, buffer, length, want_timeout);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|