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hpios_linux_kernel.c

/******************************************************************************

    AudioScience HPI driver
    Copyright (C) 1997-2003  AudioScience Inc. <support@audioscience.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of version 2 of the GNU General Public License as
    published by the Free Software Foundation;

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

HPI Operating System function implementation for Linux

(C) Copyright AudioScience Inc. 1997-2003
******************************************************************************/
#define SOURCEFILE_NAME "hpios_linux_kernel.c"
#include "hpidebug.h"
#include <linux/delay.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2 , 6 , 14)
void HpiOs_DelayMicroSeconds(
      u32 dwNumMicroSec
)
{
      if ((usecs_to_jiffies(dwNumMicroSec) > 1) && !in_interrupt()) {
            /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
            schedule_timeout_uninterruptible(usecs_to_jiffies
                  (dwNumMicroSec));
      } else if (dwNumMicroSec <= 2000)
            udelay(dwNumMicroSec);
      else
            mdelay(dwNumMicroSec / 1000);

}
#else
void HpiOs_DelayMicroSeconds(
      u32 dwNumMicroSec
)
{
      if ((dwNumMicroSec / 1000 >= 1000000 / HZ) && !in_interrupt()) {
            set_current_state(TASK_UNINTERRUPTIBLE);
            schedule_timeout((HZ * dwNumMicroSec + (HZ - 1)) / 1000000);
      } else if (dwNumMicroSec <= 2000)
            udelay(dwNumMicroSec);
      else
            mdelay(dwNumMicroSec / 1000);

}
#endif

void HpiOs_LockedMem_Init(
      void
)
{
}

/** Allocated an area of locked memory for bus master DMA operations.

On error, return -ENOMEM, and *pMemArea.size = 0
*/
u16 HpiOs_LockedMem_Alloc(
      struct consistent_dma_area *pMemArea,
      u32 size,
      struct pci_dev *pdev
)
{
      /*?? any benefit in using managed dmam_alloc_coherent? */
      pMemArea->vaddr =
            dma_alloc_coherent(&pdev->dev, size,
            &pMemArea->dma_handle, GFP_DMA32 | GFP_KERNEL);

      if (pMemArea->vaddr) {
            HPI_DEBUG_LOG(DEBUG, "Allocated %d bytes, dma 0x%x vma %p\n",
                  size,
                  (unsigned int)pMemArea->dma_handle, pMemArea->vaddr);
            pMemArea->pdev = &pdev->dev;
            pMemArea->size = size;
            return 0;
      } else {
            HPI_DEBUG_LOG(WARNING,
                  "Failed to allocate %d bytes locked memory\n", size);
            pMemArea->size = 0;
            return -ENOMEM;
      }
}

u16 HpiOs_LockedMem_Free(
      struct consistent_dma_area *pMemArea
)
{
      if (pMemArea->size) {
            dma_free_coherent(pMemArea->pdev, pMemArea->size,
                  pMemArea->vaddr, pMemArea->dma_handle);
            HPI_DEBUG_LOG(DEBUG, "Freed %lu bytes, dma 0x%x vma %p\n",
                  (unsigned long)pMemArea->size,
                  (unsigned int)pMemArea->dma_handle, pMemArea->vaddr);
            pMemArea->size = 0;
            return 0;
      } else {
            return 1;
      }
}

void HpiOs_LockedMem_FreeAll(
      void
)
{
}

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