diff options
Diffstat (limited to 'drivers/net/wireless/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c')
| -rw-r--r-- | drivers/net/wireless/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c b/drivers/net/wireless/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c new file mode 100644 index 000000000000..de236d269f0d --- /dev/null +++ b/drivers/net/wireless/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c @@ -0,0 +1,390 @@ +//------------------------------------------------------------------------------ +// <copyright file="hif_scatter.c" company="Atheros"> +// Copyright (c) 2009 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 scatter implementation +// +// Author(s): ="Atheros" +//============================================================================== + +#include <linux/mmc/card.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/kthread.h> +#include "hif_internal.h" +#define ATH_MODULE_NAME hif +#include "a_debug.h" + +#ifdef HIF_LINUX_MMC_SCATTER_SUPPORT + +#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 + +#define SDIO_SET_CMD53_ARG(arg,rw,func,mode,opcode,address,bytes_blocks) \ + (arg) = (((rw) & 1) << 31) | \ + (((func) & 0x7) << 28) | \ + (((mode) & 1) << 27) | \ + (((opcode) & 1) << 26) | \ + (((address) & 0x1FFFF) << 9) | \ + ((bytes_blocks) & 0x1FF) + +static void FreeScatterReq(HIF_DEVICE *device, HIF_SCATTER_REQ *pReq) +{ + unsigned long flag; + + spin_lock_irqsave(&device->lock, flag); + + DL_ListInsertTail(&device->ScatterReqHead, &pReq->ListLink); + + spin_unlock_irqrestore(&device->lock, flag); + +} + +static HIF_SCATTER_REQ *AllocScatterReq(HIF_DEVICE *device) +{ + DL_LIST *pItem; + unsigned long flag; + + spin_lock_irqsave(&device->lock, flag); + + pItem = DL_ListRemoveItemFromHead(&device->ScatterReqHead); + + spin_unlock_irqrestore(&device->lock, flag); + + if (pItem != NULL) { + return A_CONTAINING_STRUCT(pItem, HIF_SCATTER_REQ, ListLink); + } + + return NULL; +} + + /* called by async task to perform the operation synchronously using direct MMC APIs */ +A_STATUS DoHifReadWriteScatter(HIF_DEVICE *device, BUS_REQUEST *busrequest) +{ + int i; + A_UINT8 rw; + A_UINT8 opcode; + struct mmc_request mmcreq; + struct mmc_command cmd; + struct mmc_data data; + HIF_SCATTER_REQ_PRIV *pReqPriv; + HIF_SCATTER_REQ *pReq; + A_STATUS status = A_OK; + struct scatterlist *pSg; + + pReqPriv = busrequest->pScatterReq; + + A_ASSERT(pReqPriv != NULL); + + pReq = pReqPriv->pHifScatterReq; + + memset(&mmcreq, 0, sizeof(struct mmc_request)); + memset(&cmd, 0, sizeof(struct mmc_command)); + memset(&data, 0, sizeof(struct mmc_data)); + + data.blksz = HIF_MBOX_BLOCK_SIZE; + data.blocks = pReq->TotalLength / HIF_MBOX_BLOCK_SIZE; + + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: (%s) Address: 0x%X, (BlockLen: %d, BlockCount: %d) , (tot:%d,sg:%d)\n", + (pReq->Request & HIF_WRITE) ? "WRITE":"READ", pReq->Address, data.blksz, data.blocks, + pReq->TotalLength,pReq->ValidScatterEntries)); + + if (pReq->Request & HIF_WRITE) { + rw = _CMD53_ARG_WRITE; + data.flags = MMC_DATA_WRITE; + } else { + rw = _CMD53_ARG_READ; + data.flags = MMC_DATA_READ; + } + + if (pReq->Request & HIF_FIXED_ADDRESS) { + opcode = _CMD53_ARG_FIXED_ADDRESS; + } else { + opcode = _CMD53_ARG_INCR_ADDRESS; + } + + /* fill SG entries */ + pSg = pReqPriv->sgentries; + sg_init_table(pSg, pReq->ValidScatterEntries); + + /* assemble SG list */ + for (i = 0 ; i < pReq->ValidScatterEntries ; i++, pSg++) { + /* setup each sg entry */ + if ((A_UINT32)pReq->ScatterList[i].pBuffer & 0x3) { + /* note some scatter engines can handle unaligned buffers, print this + * as informational only */ + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, + ("HIF: (%s) Scatter Buffer is unaligned 0x%08x\n", + pReq->Request & HIF_WRITE ? "WRITE":"READ", + (A_UINT32)pReq->ScatterList[i].pBuffer)); + } + + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, (" %d: Addr:0x%X, Len:%d \n", + i,(A_UINT32)pReq->ScatterList[i].pBuffer,pReq->ScatterList[i].Length)); + + sg_set_buf(pSg, pReq->ScatterList[i].pBuffer, pReq->ScatterList[i].Length); + } + /* set scatter-gather table for request */ + data.sg = pReqPriv->sgentries; + data.sg_len = pReq->ValidScatterEntries; + /* set command argument */ + SDIO_SET_CMD53_ARG(cmd.arg, + rw, + device->func->num, + _CMD53_ARG_BLOCK_BASIS, + opcode, + pReq->Address, + data.blocks); + + cmd.opcode = SD_IO_RW_EXTENDED; + cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC; + + mmcreq.cmd = &cmd; + mmcreq.data = &data; + + mmc_set_data_timeout(&data, device->func->card); + /* synchronous call to process request */ + mmc_wait_for_req(device->func->card->host, &mmcreq); + + if (cmd.error) { + status = A_ERROR; + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: cmd error: %d \n",cmd.error)); + } + + if (data.error) { + status = A_ERROR; + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: data error: %d \n",data.error)); + } + + if (A_FAILED(status)) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: FAILED!!! (%s) Address: 0x%X, Block mode (BlockLen: %d, BlockCount: %d)\n", + (pReq->Request & HIF_WRITE) ? "WRITE":"READ",pReq->Address, data.blksz, data.blocks)); + } + + /* set completion status, fail or success */ + pReq->CompletionStatus = status; + + if (pReq->Request & HIF_ASYNCHRONOUS) { + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: async_task completion routine req: 0x%X (%d)\n",(unsigned int)busrequest, status)); + /* complete the request */ + A_ASSERT(pReq->CompletionRoutine != NULL); + pReq->CompletionRoutine(pReq); + } else { + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER async_task upping busrequest : 0x%X (%d)\n", (unsigned int)busrequest,status)); + /* signal wait */ + up(&busrequest->sem_req); + } + + return status; +} + + /* callback to issue a read-write scatter request */ +static A_STATUS HifReadWriteScatter(HIF_DEVICE *device, HIF_SCATTER_REQ *pReq) +{ + A_STATUS status = A_EINVAL; + A_UINT32 request = pReq->Request; + HIF_SCATTER_REQ_PRIV *pReqPriv = (HIF_SCATTER_REQ_PRIV *)pReq->HIFPrivate[0]; + + do { + + A_ASSERT(pReqPriv != NULL); + + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: total len: %d Scatter Entries: %d\n", + pReq->TotalLength, pReq->ValidScatterEntries)); + + if (!(request & HIF_EXTENDED_IO)) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, + ("HIF-SCATTER: Invalid command type: 0x%08x\n", request)); + break; + } + + if (!(request & (HIF_SYNCHRONOUS | HIF_ASYNCHRONOUS))) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, + ("HIF-SCATTER: Invalid execution mode: 0x%08x\n", request)); + break; + } + + if (!(request & HIF_BLOCK_BASIS)) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, + ("HIF-SCATTER: Invalid data mode: 0x%08x\n", request)); + break; + } + + if (pReq->TotalLength > MAX_SCATTER_REQ_TRANSFER_SIZE) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, + ("HIF-SCATTER: Invalid length: %d \n", pReq->TotalLength)); + break; + } + + if (pReq->TotalLength == 0) { + A_ASSERT(FALSE); + break; + } + + /* add bus request to the async list for the async I/O thread to process */ + AddToAsyncList(device, pReqPriv->busrequest); + + if (request & HIF_SYNCHRONOUS) { + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued sync req: 0x%X\n", (unsigned int)pReqPriv->busrequest)); + /* signal thread and wait */ + up(&device->sem_async); + if (down_interruptible(&pReqPriv->busrequest->sem_req) != 0) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,("HIF-SCATTER: interrupted! \n")); + /* interrupted, exit */ + status = A_ERROR; + break; + } else { + status = pReq->CompletionStatus; + } + } else { + AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued async req: 0x%X\n", (unsigned int)pReqPriv->busrequest)); + /* wake thread, it will process and then take care of the async callback */ + up(&device->sem_async); + status = A_OK; + } + + } while (FALSE); + + if (A_FAILED(status) && (request & HIF_ASYNCHRONOUS)) { + pReq->CompletionStatus = status; + pReq->CompletionRoutine(pReq); + status = A_OK; + } + + return status; +} + + /* setup of HIF scatter resources */ +A_STATUS SetupHIFScatterSupport(HIF_DEVICE *device, HIF_DEVICE_SCATTER_SUPPORT_INFO *pInfo) +{ + A_STATUS status = A_ERROR; + int i; + HIF_SCATTER_REQ_PRIV *pReqPriv; + BUS_REQUEST *busrequest; + + do { + + /* check if host supports scatter requests and it meets our requirements */ + if (device->func->card->host->max_hw_segs < MAX_SCATTER_ENTRIES_PER_REQ) { + AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : host only supports scatter of : %d entries, need: %d \n", + device->func->card->host->max_hw_segs, MAX_SCATTER_ENTRIES_PER_REQ)); + status = A_ENOTSUP; + break; + } + + AR_DEBUG_PRINTF(ATH_DEBUG_ANY,("HIF-SCATTER Enabled: max scatter req : %d entries: %d \n", + MAX_SCATTER_REQUESTS, MAX_SCATTER_ENTRIES_PER_REQ)); + + for (i = 0; i < MAX_SCATTER_REQUESTS; i++) { + /* allocate the private request blob */ + pReqPriv = (HIF_SCATTER_REQ_PRIV *)A_MALLOC(sizeof(HIF_SCATTER_REQ_PRIV)); + if (NULL == pReqPriv) { + break; + } + A_MEMZERO(pReqPriv, sizeof(HIF_SCATTER_REQ_PRIV)); + /* save the device instance*/ + pReqPriv->device = device; + /* allocate the scatter request */ + pReqPriv->pHifScatterReq = (HIF_SCATTER_REQ *)A_MALLOC(sizeof(HIF_SCATTER_REQ) + + (MAX_SCATTER_ENTRIES_PER_REQ - 1) * (sizeof(HIF_SCATTER_ITEM))); + + if (NULL == pReqPriv->pHifScatterReq) { + A_FREE(pReqPriv); + break; + } + /* just zero the main part of the scatter request */ + A_MEMZERO(pReqPriv->pHifScatterReq, sizeof(HIF_SCATTER_REQ)); + /* back pointer to the private struct */ + pReqPriv->pHifScatterReq->HIFPrivate[0] = pReqPriv; + /* allocate a bus request for this scatter request */ + busrequest = hifAllocateBusRequest(device); + if (NULL == busrequest) { + A_FREE(pReqPriv->pHifScatterReq); + A_FREE(pReqPriv); + break; + } + /* assign the scatter request to this bus request */ + busrequest->pScatterReq = pReqPriv; + /* point back to the request */ + pReqPriv->busrequest = busrequest; + /* add it to the scatter pool */ + FreeScatterReq(device,pReqPriv->pHifScatterReq); + } + + if (i != MAX_SCATTER_REQUESTS) { + status = A_NO_MEMORY; + AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : failed to alloc scatter resources !\n")); + break; + } + + /* set scatter function pointers */ + pInfo->pAllocateReqFunc = AllocScatterReq; + pInfo->pFreeReqFunc = FreeScatterReq; + pInfo->pReadWriteScatterFunc = HifReadWriteScatter; + pInfo->MaxScatterEntries = MAX_SCATTER_ENTRIES_PER_REQ; + pInfo->MaxTransferSizePerScatterReq = MAX_SCATTER_REQ_TRANSFER_SIZE; + + status = A_OK; + + } while (FALSE); + + if (A_FAILED(status)) { + CleanupHIFScatterResources(device); + } + + return status; +} + + /* clean up scatter support */ +void CleanupHIFScatterResources(HIF_DEVICE *device) +{ + HIF_SCATTER_REQ_PRIV *pReqPriv; + HIF_SCATTER_REQ *pReq; + + /* empty the free list */ + + while (1) { + + pReq = AllocScatterReq(device); + + if (NULL == pReq) { + break; + } + + pReqPriv = (HIF_SCATTER_REQ_PRIV *)pReq->HIFPrivate[0]; + A_ASSERT(pReqPriv != NULL); + + if (pReqPriv->busrequest != NULL) { + pReqPriv->busrequest->pScatterReq = NULL; + /* free bus request */ + hifFreeBusRequest(device, pReqPriv->busrequest); + pReqPriv->busrequest = NULL; + } + + if (pReqPriv->pHifScatterReq != NULL) { + A_FREE(pReqPriv->pHifScatterReq); + pReqPriv->pHifScatterReq = NULL; + } + + A_FREE(pReqPriv); + } +} + +#endif // HIF_LINUX_MMC_SCATTER_SUPPORT |