projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 719f82d3 EB |
1 | /****************************************************************************** |
| 2 | ||
| 3 | AudioScience HPI driver | |
| 92fd918c | 4 | Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com> |
| 719f82d3 EB |
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 | ||
| 92fd918c | 42 | /** Allocate an area of locked memory for bus master DMA operations. |
| 719f82d3 | 43 | |
| 92fd918c | 44 | If allocation fails, return 1, and *pMemArea.size = 0 |
| 719f82d3 | 45 | */ |
| 92fd918c | 46 | u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size, |
| 719f82d3 EB |
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; | |
| 92fd918c | 65 | return 1; |
| 719f82d3 EB |
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 | } |