| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | |
| 3 | AudioScience HPI driver |
| 4 | Copyright (C) 1997-2012 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 | /** Allocate an area of locked memory for bus master DMA operations. |
| 43 | |
| 44 | If allocation fails, return 1, 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 1; |
| 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 | } |