| /* |
| * Copyright (c) 2013 Luis R. Rodriguez <mcgrof@do-not-panic.com> |
| * |
| * Backport compatibility file for Linux for some DMA helpers |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/scatterlist.h> |
| #include <linux/dma-attrs.h> |
| #include <linux/device.h> |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) |
| #if LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0) |
| #include <linux/dma-direction.h> |
| #include <linux/dma-mapping.h> |
| #include <asm/dma-mapping.h> |
| #endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(3,6,0) */ |
| #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) */ |
| |
| #if RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7,0) |
| /* |
| * Create scatter-list for the already allocated DMA buffer. |
| */ |
| int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, |
| void *cpu_addr, dma_addr_t handle, size_t size) |
| { |
| struct page *page = virt_to_page(cpu_addr); |
| int ret; |
| |
| ret = sg_alloc_table(sgt, 1, GFP_KERNEL); |
| if (unlikely(ret)) |
| return ret; |
| |
| sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(dma_common_get_sgtable); |
| #endif /* RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7,0) */ |
