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hpios.c

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

    AudioScience HPI driver
    Copyright (C) 1997-2010  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.c"
#include "hpi_internal.h"
#include "hpidebug.h"
#include <linux/delay.h>
#include <linux/sched.h>

void hpios_delay_micro_seconds(u32 num_micro_sec)
{
      if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
            /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
            schedule_timeout_uninterruptible(usecs_to_jiffies
                  (num_micro_sec));
      } else if (num_micro_sec <= 2000)
            udelay(num_micro_sec);
      else
            mdelay(num_micro_sec / 1000);

}

void hpios_locked_mem_init(void)
{
}

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

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

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

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

void hpios_locked_mem_free_all(void)
{
}

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