Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[~shefty/rdma-dev.git] / sound / pci / asihpi / hpios.c
1 /******************************************************************************
2
3     AudioScience HPI driver
4     Copyright (C) 1997-2011  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
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 /** Allocated an area of locked memory for bus master DMA operations.
43
44 On error, return -ENOMEM, and *pMemArea.size = 0
45 */
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 -ENOMEM;
66         }
67 }
68
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 }