/******************************************************************************
|
|
AudioScience HPI driver
|
Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com>
|
|
This program is free software; you can redistribute it and/or modify
|
it under the terms of version 2 of the GNU General Public License as
|
published by the Free Software Foundation;
|
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
|
You should have received a copy of the GNU General Public License
|
along with this program; if not, write to the Free Software
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
HPI Operating System function implementation for Linux
|
|
(C) Copyright AudioScience Inc. 1997-2003
|
******************************************************************************/
|
#define SOURCEFILE_NAME "hpios.c"
|
#include "hpi_internal.h"
|
#include "hpidebug.h"
|
#include <linux/delay.h>
|
#include <linux/sched.h>
|
|
void hpios_delay_micro_seconds(u32 num_micro_sec)
|
{
|
if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
|
/* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
|
schedule_timeout_uninterruptible(usecs_to_jiffies
|
(num_micro_sec));
|
} else if (num_micro_sec <= 2000)
|
udelay(num_micro_sec);
|
else
|
mdelay(num_micro_sec / 1000);
|
|
}
|
|
/** Allocate an area of locked memory for bus master DMA operations.
|
|
If allocation fails, return 1, and *pMemArea.size = 0
|
*/
|
u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
|
struct pci_dev *pdev)
|
{
|
/*?? any benefit in using managed dmam_alloc_coherent? */
|
p_mem_area->vaddr =
|
dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
|
GFP_DMA32 | GFP_KERNEL);
|
|
if (p_mem_area->vaddr) {
|
HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
|
size, (unsigned int)p_mem_area->dma_handle,
|
p_mem_area->vaddr);
|
p_mem_area->pdev = &pdev->dev;
|
p_mem_area->size = size;
|
return 0;
|
} else {
|
HPI_DEBUG_LOG(WARNING,
|
"failed to allocate %d bytes locked memory\n", size);
|
p_mem_area->size = 0;
|
return 1;
|
}
|
}
|
|
u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
|
{
|
if (p_mem_area->size) {
|
dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
|
p_mem_area->vaddr, p_mem_area->dma_handle);
|
HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
|
(unsigned long)p_mem_area->size,
|
(unsigned int)p_mem_area->dma_handle,
|
p_mem_area->vaddr);
|
p_mem_area->size = 0;
|
return 0;
|
} else {
|
return 1;
|
}
|
}
|
