| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /****************************************************************************** |
| 3 | |
| 4 | AudioScience HPI driver |
| 5 | Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com> |
| 6 | |
| 7 | |
| 8 | HPI Operating System function implementation for Linux |
| 9 | |
| 10 | (C) Copyright AudioScience Inc. 1997-2003 |
| 11 | ******************************************************************************/ |
| 12 | #define SOURCEFILE_NAME "hpios.c" |
| 13 | #include "hpi_internal.h" |
| 14 | #include "hpidebug.h" |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/sched.h> |
| 17 | |
| 18 | void hpios_delay_micro_seconds(u32 num_micro_sec) |
| 19 | { |
| 20 | if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) { |
| 21 | /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */ |
| 22 | schedule_timeout_uninterruptible(usecs_to_jiffies |
| 23 | (num_micro_sec)); |
| 24 | } else if (num_micro_sec <= 2000) |
| 25 | udelay(num_micro_sec); |
| 26 | else |
| 27 | mdelay(num_micro_sec / 1000); |
| 28 | |
| 29 | } |
| 30 | |
| 31 | /** Allocate an area of locked memory for bus master DMA operations. |
| 32 | |
| 33 | If allocation fails, return 1, and *pMemArea.size = 0 |
| 34 | */ |
| 35 | u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size, |
| 36 | struct pci_dev *pdev) |
| 37 | { |
| 38 | /*?? any benefit in using managed dmam_alloc_coherent? */ |
| 39 | p_mem_area->vaddr = |
| 40 | dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle, |
| 41 | GFP_KERNEL); |
| 42 | |
| 43 | if (p_mem_area->vaddr) { |
| 44 | HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n", |
| 45 | size, (unsigned int)p_mem_area->dma_handle, |
| 46 | p_mem_area->vaddr); |
| 47 | p_mem_area->pdev = &pdev->dev; |
| 48 | p_mem_area->size = size; |
| 49 | return 0; |
| 50 | } else { |
| 51 | HPI_DEBUG_LOG(WARNING, |
| 52 | "failed to allocate %d bytes locked memory\n", size); |
| 53 | p_mem_area->size = 0; |
| 54 | return 1; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area) |
| 59 | { |
| 60 | if (p_mem_area->size) { |
| 61 | dma_free_coherent(p_mem_area->pdev, p_mem_area->size, |
| 62 | p_mem_area->vaddr, p_mem_area->dma_handle); |
| 63 | HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n", |
| 64 | (unsigned long)p_mem_area->size, |
| 65 | (unsigned int)p_mem_area->dma_handle, |
| 66 | p_mem_area->vaddr); |
| 67 | p_mem_area->size = 0; |
| 68 | return 0; |
| 69 | } else { |
| 70 | return 1; |
| 71 | } |
| 72 | } |