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
hpios_delay_micro_seconds(u32 num_micro_sec)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 */
hpios_locked_mem_alloc(struct consistent_dma_area * p_mem_area,u32 size,struct pci_dev * pdev)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
hpios_locked_mem_free(struct consistent_dma_area * p_mem_area)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