hpios.c
2.62 KB
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/******************************************************************************
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;
}
}