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 } 73