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 void hpios_locked_mem_init(void)
46 /** Allocated an area of locked memory for bus master DMA operations.
48 On error, return -ENOMEM, and *pMemArea.size = 0
50 u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
53 /*?? any benefit in using managed dmam_alloc_coherent? */
55 dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
56 GFP_DMA32 | GFP_KERNEL);
58 if (p_mem_area->vaddr) {
59 HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
60 size, (unsigned int)p_mem_area->dma_handle,
62 p_mem_area->pdev = &pdev->dev;
63 p_mem_area->size = size;
66 HPI_DEBUG_LOG(WARNING,
67 "failed to allocate %d bytes locked memory\n", size);
73 u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
75 if (p_mem_area->size) {
76 dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
77 p_mem_area->vaddr, p_mem_area->dma_handle);
78 HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
79 (unsigned long)p_mem_area->size,
80 (unsigned int)p_mem_area->dma_handle,
89 void hpios_locked_mem_free_all(void)
93 void __iomem *hpios_map_io(struct pci_dev *pci_dev, int idx,
96 HPI_DEBUG_LOG(DEBUG, "mapping %d %s %08llx-%08llx %04llx len 0x%x\n",
97 idx, pci_dev->resource[idx].name,
98 (unsigned long long)pci_resource_start(pci_dev, idx),
99 (unsigned long long)pci_resource_end(pci_dev, idx),
100 (unsigned long long)pci_resource_flags(pci_dev, idx), length);
102 if (!(pci_resource_flags(pci_dev, idx) & IORESOURCE_MEM)) {
103 HPI_DEBUG_LOG(ERROR, "not an io memory resource\n");
107 if (length > pci_resource_len(pci_dev, idx)) {
108 HPI_DEBUG_LOG(ERROR, "resource too small for requested %d \n",
113 return ioremap(pci_resource_start(pci_dev, idx), length);