1 /******************************************************************************
3 AudioScience HPI driver
4 Copyright (C) 1997-2010 AudioScience Inc. <support@audioscience.com>
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;
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.
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
19 HPI Operating System function implementation for Linux
21 (C) Copyright AudioScience Inc. 1997-2003
22 ******************************************************************************/
23 #define SOURCEFILE_NAME "hpios.c"
24 #include "hpi_internal.h"
26 #include <linux/delay.h>
27 #include <linux/sched.h>
29 void hpios_delay_micro_seconds(u32 num_micro_sec
)
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
35 } else if (num_micro_sec
<= 2000)
36 udelay(num_micro_sec
);
38 mdelay(num_micro_sec
/ 1000);
42 /** Allocated an area of locked memory for bus master DMA operations.
44 On error, return -ENOMEM, and *pMemArea.size = 0
46 u16
hpios_locked_mem_alloc(struct consistent_dma_area
*p_mem_area
, u32 size
,
49 /*?? any benefit in using managed dmam_alloc_coherent? */
51 dma_alloc_coherent(&pdev
->dev
, size
, &p_mem_area
->dma_handle
,
52 GFP_DMA32
| GFP_KERNEL
);
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
,
58 p_mem_area
->pdev
= &pdev
->dev
;
59 p_mem_area
->size
= size
;
62 HPI_DEBUG_LOG(WARNING
,
63 "failed to allocate %d bytes locked memory\n", size
);
69 u16
hpios_locked_mem_free(struct consistent_dma_area
*p_mem_area
)
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
,