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1// SPDX-License-Identifier: GPL-2.0-only2/******************************************************************************3 4 AudioScience HPI driver5 Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com>6 7 8HPI Operating System function implementation for Linux9 10(C) Copyright AudioScience Inc. 1997-200311******************************************************************************/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 18void 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_jiffies23 (num_micro_sec));24 } else if (num_micro_sec <= 2000)25 udelay(num_micro_sec);26 else27 mdelay(num_micro_sec / 1000);28 29}30 31/** Allocate an area of locked memory for bus master DMA operations.32 33If allocation fails, return 1, and *pMemArea.size = 034*/35u16 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 58u16 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