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Linux/sound/pci/asihpi/hpios.c

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  1 /******************************************************************************
  2 
  3     AudioScience HPI driver
  4     Copyright (C) 1997-2012  AudioScience Inc. <support@audioscience.com>
  5 
  6     This program is free software; you can redistribute it and/or modify
  7     it under the terms of version 2 of the GNU General Public License as
  8     published by the Free Software Foundation;
  9 
 10     This program is distributed in the hope that it will be useful,
 11     but WITHOUT ANY WARRANTY; without even the implied warranty of
 12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13     GNU General Public License for more details.
 14 
 15     You should have received a copy of the GNU General Public License
 16     along with this program; if not, write to the Free Software
 17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 18 
 19 HPI Operating System function implementation for Linux
 20 
 21 (C) Copyright AudioScience Inc. 1997-2003
 22 ******************************************************************************/
 23 #define SOURCEFILE_NAME "hpios.c"
 24 #include "hpi_internal.h"
 25 #include "hpidebug.h"
 26 #include <linux/delay.h>
 27 #include <linux/sched.h>
 28 
 29 void hpios_delay_micro_seconds(u32 num_micro_sec)
 30 {
 31         if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
 32                 /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
 33                 schedule_timeout_uninterruptible(usecs_to_jiffies
 34                         (num_micro_sec));
 35         } else if (num_micro_sec <= 2000)
 36                 udelay(num_micro_sec);
 37         else
 38                 mdelay(num_micro_sec / 1000);
 39 
 40 }
 41 
 42 /** Allocate an area of locked memory for bus master DMA operations.
 43 
 44 If allocation fails, return 1, and *pMemArea.size = 0
 45 */
 46 u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
 47         struct pci_dev *pdev)
 48 {
 49         /*?? any benefit in using managed dmam_alloc_coherent? */
 50         p_mem_area->vaddr =
 51                 dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
 52                 GFP_DMA32 | GFP_KERNEL);
 53 
 54         if (p_mem_area->vaddr) {
 55                 HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
 56                         size, (unsigned int)p_mem_area->dma_handle,
 57                         p_mem_area->vaddr);
 58                 p_mem_area->pdev = &pdev->dev;
 59                 p_mem_area->size = size;
 60                 return 0;
 61         } else {
 62                 HPI_DEBUG_LOG(WARNING,
 63                         "failed to allocate %d bytes locked memory\n", size);
 64                 p_mem_area->size = 0;
 65                 return 1;
 66         }
 67 }
 68 
 69 u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
 70 {
 71         if (p_mem_area->size) {
 72                 dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
 73                         p_mem_area->vaddr, p_mem_area->dma_handle);
 74                 HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
 75                         (unsigned long)p_mem_area->size,
 76                         (unsigned int)p_mem_area->dma_handle,
 77                         p_mem_area->vaddr);
 78                 p_mem_area->size = 0;
 79                 return 0;
 80         } else {
 81                 return 1;
 82         }
 83 }
 84 

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