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_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 } 84