hpios.c 2.0 KB

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