1*07d7fe7bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2719f82d3SEliot Blennerhassett /****************************************************************************** 3719f82d3SEliot Blennerhassett 4719f82d3SEliot Blennerhassett AudioScience HPI driver 592fd918cSEliot Blennerhassett Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com> 6719f82d3SEliot Blennerhassett 7719f82d3SEliot Blennerhassett 8719f82d3SEliot Blennerhassett HPI Operating System function implementation for Linux 9719f82d3SEliot Blennerhassett 10719f82d3SEliot Blennerhassett (C) Copyright AudioScience Inc. 1997-2003 11719f82d3SEliot Blennerhassett ******************************************************************************/ 12719f82d3SEliot Blennerhassett #define SOURCEFILE_NAME "hpios.c" 13719f82d3SEliot Blennerhassett #include "hpi_internal.h" 14719f82d3SEliot Blennerhassett #include "hpidebug.h" 15719f82d3SEliot Blennerhassett #include <linux/delay.h> 16719f82d3SEliot Blennerhassett #include <linux/sched.h> 17719f82d3SEliot Blennerhassett 18719f82d3SEliot Blennerhassett void hpios_delay_micro_seconds(u32 num_micro_sec) 19719f82d3SEliot Blennerhassett { 20719f82d3SEliot Blennerhassett if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) { 21719f82d3SEliot Blennerhassett /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */ 22719f82d3SEliot Blennerhassett schedule_timeout_uninterruptible(usecs_to_jiffies 23719f82d3SEliot Blennerhassett (num_micro_sec)); 24719f82d3SEliot Blennerhassett } else if (num_micro_sec <= 2000) 25719f82d3SEliot Blennerhassett udelay(num_micro_sec); 26719f82d3SEliot Blennerhassett else 27719f82d3SEliot Blennerhassett mdelay(num_micro_sec / 1000); 28719f82d3SEliot Blennerhassett 29719f82d3SEliot Blennerhassett } 30719f82d3SEliot Blennerhassett 3192fd918cSEliot Blennerhassett /** Allocate an area of locked memory for bus master DMA operations. 32719f82d3SEliot Blennerhassett 3392fd918cSEliot Blennerhassett If allocation fails, return 1, and *pMemArea.size = 0 34719f82d3SEliot Blennerhassett */ 3592fd918cSEliot Blennerhassett u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size, 36719f82d3SEliot Blennerhassett struct pci_dev *pdev) 37719f82d3SEliot Blennerhassett { 38719f82d3SEliot Blennerhassett /*?? any benefit in using managed dmam_alloc_coherent? */ 39719f82d3SEliot Blennerhassett p_mem_area->vaddr = 40719f82d3SEliot Blennerhassett dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle, 4123fdf223SChristoph Hellwig GFP_KERNEL); 42719f82d3SEliot Blennerhassett 43719f82d3SEliot Blennerhassett if (p_mem_area->vaddr) { 44719f82d3SEliot Blennerhassett HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n", 45719f82d3SEliot Blennerhassett size, (unsigned int)p_mem_area->dma_handle, 46719f82d3SEliot Blennerhassett p_mem_area->vaddr); 47719f82d3SEliot Blennerhassett p_mem_area->pdev = &pdev->dev; 48719f82d3SEliot Blennerhassett p_mem_area->size = size; 49719f82d3SEliot Blennerhassett return 0; 50719f82d3SEliot Blennerhassett } else { 51719f82d3SEliot Blennerhassett HPI_DEBUG_LOG(WARNING, 52719f82d3SEliot Blennerhassett "failed to allocate %d bytes locked memory\n", size); 53719f82d3SEliot Blennerhassett p_mem_area->size = 0; 5492fd918cSEliot Blennerhassett return 1; 55719f82d3SEliot Blennerhassett } 56719f82d3SEliot Blennerhassett } 57719f82d3SEliot Blennerhassett 58719f82d3SEliot Blennerhassett u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area) 59719f82d3SEliot Blennerhassett { 60719f82d3SEliot Blennerhassett if (p_mem_area->size) { 61719f82d3SEliot Blennerhassett dma_free_coherent(p_mem_area->pdev, p_mem_area->size, 62719f82d3SEliot Blennerhassett p_mem_area->vaddr, p_mem_area->dma_handle); 63719f82d3SEliot Blennerhassett HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n", 64719f82d3SEliot Blennerhassett (unsigned long)p_mem_area->size, 65719f82d3SEliot Blennerhassett (unsigned int)p_mem_area->dma_handle, 66719f82d3SEliot Blennerhassett p_mem_area->vaddr); 67719f82d3SEliot Blennerhassett p_mem_area->size = 0; 68719f82d3SEliot Blennerhassett return 0; 69719f82d3SEliot Blennerhassett } else { 70719f82d3SEliot Blennerhassett return 1; 71719f82d3SEliot Blennerhassett } 72719f82d3SEliot Blennerhassett } 73