1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /******************************************************************************
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun AudioScience HPI driver
5*4882a593Smuzhiyun Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun HPI Operating System function implementation for Linux
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun (C) Copyright AudioScience Inc. 1997-2003
11*4882a593Smuzhiyun ******************************************************************************/
12*4882a593Smuzhiyun #define SOURCEFILE_NAME "hpios.c"
13*4882a593Smuzhiyun #include "hpi_internal.h"
14*4882a593Smuzhiyun #include "hpidebug.h"
15*4882a593Smuzhiyun #include <linux/delay.h>
16*4882a593Smuzhiyun #include <linux/sched.h>
17*4882a593Smuzhiyun
hpios_delay_micro_seconds(u32 num_micro_sec)18*4882a593Smuzhiyun void hpios_delay_micro_seconds(u32 num_micro_sec)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
21*4882a593Smuzhiyun /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
22*4882a593Smuzhiyun schedule_timeout_uninterruptible(usecs_to_jiffies
23*4882a593Smuzhiyun (num_micro_sec));
24*4882a593Smuzhiyun } else if (num_micro_sec <= 2000)
25*4882a593Smuzhiyun udelay(num_micro_sec);
26*4882a593Smuzhiyun else
27*4882a593Smuzhiyun mdelay(num_micro_sec / 1000);
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun /** Allocate an area of locked memory for bus master DMA operations.
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun If allocation fails, return 1, and *pMemArea.size = 0
34*4882a593Smuzhiyun */
hpios_locked_mem_alloc(struct consistent_dma_area * p_mem_area,u32 size,struct pci_dev * pdev)35*4882a593Smuzhiyun u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
36*4882a593Smuzhiyun struct pci_dev *pdev)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun /*?? any benefit in using managed dmam_alloc_coherent? */
39*4882a593Smuzhiyun p_mem_area->vaddr =
40*4882a593Smuzhiyun dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
41*4882a593Smuzhiyun GFP_KERNEL);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun if (p_mem_area->vaddr) {
44*4882a593Smuzhiyun HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
45*4882a593Smuzhiyun size, (unsigned int)p_mem_area->dma_handle,
46*4882a593Smuzhiyun p_mem_area->vaddr);
47*4882a593Smuzhiyun p_mem_area->pdev = &pdev->dev;
48*4882a593Smuzhiyun p_mem_area->size = size;
49*4882a593Smuzhiyun return 0;
50*4882a593Smuzhiyun } else {
51*4882a593Smuzhiyun HPI_DEBUG_LOG(WARNING,
52*4882a593Smuzhiyun "failed to allocate %d bytes locked memory\n", size);
53*4882a593Smuzhiyun p_mem_area->size = 0;
54*4882a593Smuzhiyun return 1;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
hpios_locked_mem_free(struct consistent_dma_area * p_mem_area)58*4882a593Smuzhiyun u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun if (p_mem_area->size) {
61*4882a593Smuzhiyun dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
62*4882a593Smuzhiyun p_mem_area->vaddr, p_mem_area->dma_handle);
63*4882a593Smuzhiyun HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
64*4882a593Smuzhiyun (unsigned long)p_mem_area->size,
65*4882a593Smuzhiyun (unsigned int)p_mem_area->dma_handle,
66*4882a593Smuzhiyun p_mem_area->vaddr);
67*4882a593Smuzhiyun p_mem_area->size = 0;
68*4882a593Smuzhiyun return 0;
69*4882a593Smuzhiyun } else {
70*4882a593Smuzhiyun return 1;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun }
73