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
19HPI 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
29void 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
44If allocation fails, return 1, and *pMemArea.size = 0
45*/
46u16 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
69u16 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