diff options
Diffstat (limited to 'sound/pci/asihpi/hpios.c')
| -rw-r--r-- | sound/pci/asihpi/hpios.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/sound/pci/asihpi/hpios.c b/sound/pci/asihpi/hpios.c new file mode 100644 index 000000000000..de615cfdb950 --- /dev/null +++ b/sound/pci/asihpi/hpios.c @@ -0,0 +1,114 @@ +/****************************************************************************** + + AudioScience HPI driver + Copyright (C) 1997-2010 AudioScience Inc. <support@audioscience.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of version 2 of the GNU General Public License as + published by the Free Software Foundation; + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +HPI Operating System function implementation for Linux + +(C) Copyright AudioScience Inc. 1997-2003 +******************************************************************************/ +#define SOURCEFILE_NAME "hpios.c" +#include "hpi_internal.h" +#include "hpidebug.h" +#include <linux/delay.h> +#include <linux/sched.h> + +void hpios_delay_micro_seconds(u32 num_micro_sec) +{ + if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) { + /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */ + schedule_timeout_uninterruptible(usecs_to_jiffies + (num_micro_sec)); + } else if (num_micro_sec <= 2000) + udelay(num_micro_sec); + else + mdelay(num_micro_sec / 1000); + +} + +void hpios_locked_mem_init(void) +{ +} + +/** Allocated an area of locked memory for bus master DMA operations. + +On error, return -ENOMEM, and *pMemArea.size = 0 +*/ +u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size, + struct pci_dev *pdev) +{ + /*?? any benefit in using managed dmam_alloc_coherent? */ + p_mem_area->vaddr = + dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle, + GFP_DMA32 | GFP_KERNEL); + + if (p_mem_area->vaddr) { + HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n", + size, (unsigned int)p_mem_area->dma_handle, + p_mem_area->vaddr); + p_mem_area->pdev = &pdev->dev; + p_mem_area->size = size; + return 0; + } else { + HPI_DEBUG_LOG(WARNING, + "failed to allocate %d bytes locked memory\n", size); + p_mem_area->size = 0; + return -ENOMEM; + } +} + +u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area) +{ + if (p_mem_area->size) { + dma_free_coherent(p_mem_area->pdev, p_mem_area->size, + p_mem_area->vaddr, p_mem_area->dma_handle); + HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n", + (unsigned long)p_mem_area->size, + (unsigned int)p_mem_area->dma_handle, + p_mem_area->vaddr); + p_mem_area->size = 0; + return 0; + } else { + return 1; + } +} + +void hpios_locked_mem_free_all(void) +{ +} + +void __iomem *hpios_map_io(struct pci_dev *pci_dev, int idx, + unsigned int length) +{ + HPI_DEBUG_LOG(DEBUG, "mapping %d %s %08llx-%08llx %04llx len 0x%x\n", + idx, pci_dev->resource[idx].name, + (unsigned long long)pci_resource_start(pci_dev, idx), + (unsigned long long)pci_resource_end(pci_dev, idx), + (unsigned long long)pci_resource_flags(pci_dev, idx), length); + + if (!(pci_resource_flags(pci_dev, idx) & IORESOURCE_MEM)) { + HPI_DEBUG_LOG(ERROR, "not an io memory resource\n"); + return NULL; + } + + if (length > pci_resource_len(pci_dev, idx)) { + HPI_DEBUG_LOG(ERROR, "resource too small for requested %d \n", + length); + return NULL; + } + + return ioremap(pci_resource_start(pci_dev, idx), length); +} |