sound/pci/asihpi/hpios.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3
   4     AudioScience HPI driver
   5     Copyright (C) 1997-2012  AudioScience Inc. <support@audioscience.com>
   6
   7
   8 HPI Operating System function implementation for Linux
   9
  10 (C) Copyright AudioScience Inc. 1997-2003
  11 ******************************************************************************/
  12 #define SOURCEFILE_NAME "hpios.c"
  13 #include "hpi_internal.h"
  14 #include "hpidebug.h"
  15 #include <linux/delay.h>
  16 #include <linux/sched.h>
  17
  18 void hpios_delay_micro_seconds(u32 num_micro_sec)
  19 {
  20         if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
  21                 /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
  22                 schedule_timeout_uninterruptible(usecs_to_jiffies
  23                         (num_micro_sec));
  24         } else if (num_micro_sec <= 2000)
  25                 udelay(num_micro_sec);
  26         else
  27                 mdelay(num_micro_sec / 1000);
  28
  29 }
  30
  31 /** Allocate an area of locked memory for bus master DMA operations.
  32
  33 If allocation fails, return 1, and *pMemArea.size = 0
  34 */
  35 u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
  36         struct pci_dev *pdev)
  37 {
  38         /*?? any benefit in using managed dmam_alloc_coherent? */
  39         p_mem_area->vaddr =
  40                 dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
  41                 GFP_KERNEL);
  42
  43         if (p_mem_area->vaddr) {
  44                 HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
  45                         size, (unsigned int)p_mem_area->dma_handle,
  46                         p_mem_area->vaddr);
  47                 p_mem_area->pdev = &pdev->dev;
  48                 p_mem_area->size = size;
  49                 return 0;
  50         } else {
  51                 HPI_DEBUG_LOG(WARNING,
  52                         "failed to allocate %d bytes locked memory\n", size);
  53                 p_mem_area->size = 0;
  54                 return 1;
  55         }
  56 }
  57
  58 u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
  59 {
  60         if (p_mem_area->size) {
  61                 dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
  62                         p_mem_area->vaddr, p_mem_area->dma_handle);
  63                 HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
  64                         (unsigned long)p_mem_area->size,
  65                         (unsigned int)p_mem_area->dma_handle,
  66                         p_mem_area->vaddr);
  67                 p_mem_area->size = 0;
  68                 return 0;
  69         } else {
  70                 return 1;
  71         }
  72 }