| /* |
| * Copyright (c) Quantenna Communications, Inc. 2012 |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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 |
| * |
| */ |
| |
| #ifndef __QTN_DMA_UTIL_H |
| #define __QTN_DMA_UTIL_H |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <linux/types.h> |
| #include <linux/dma-mapping.h> |
| #include <asm/dma-mapping.h> |
| #include <asm/cacheflush.h> |
| |
| #define ALIGNED_DMA_DESC(typeq, type) \ |
| struct aligned_dma_##type { \ |
| uint32_t desc_count; \ |
| typeq type *descs; \ |
| unsigned long aligned_vdescs; \ |
| unsigned long unaligned_vdescs; \ |
| unsigned long descs_dma_addr; \ |
| } |
| |
| typedef ALIGNED_DMA_DESC(, void) aligned_dma_descs; |
| |
| #define ALIGNED_DMA_DESC_ALLOC(_ptr, _count, _align, _is_sram) \ |
| dmautil_aligned_dma_desc_alloc((aligned_dma_descs *)(_ptr), \ |
| sizeof((_ptr)->descs[0]), (_count), (_align), (_is_sram)) |
| int dmautil_aligned_dma_desc_alloc(aligned_dma_descs *d, |
| unsigned int desc_size, unsigned int desc_count, |
| unsigned int align, bool is_sram); |
| |
| #define ALIGNED_DMA_DESC_FREE(_ptr) dmautil_aligned_dma_desc_free((aligned_dma_descs *)(_ptr)) |
| void dmautil_aligned_dma_desc_free(aligned_dma_descs *d); |
| |
| /* |
| * Alignment helpers |
| */ |
| __always_inline static unsigned long align_val_up(unsigned long val, unsigned long step) |
| { |
| return ((val + step - 1) & (~(step - 1))); |
| } |
| __always_inline static unsigned long align_val_down(unsigned long val, unsigned long step) |
| { |
| return (val & (~(step - 1))); |
| } |
| __always_inline static void* align_buf_dma(void *addr) |
| { |
| return (void*)align_val_up((unsigned long)addr, dma_get_cache_alignment()); |
| } |
| __always_inline static unsigned long align_buf_dma_offset(void *addr) |
| { |
| return (align_buf_dma(addr) - addr); |
| } |
| __always_inline static void* align_buf_cache(void *addr) |
| { |
| return (void*)align_val_down((unsigned long)addr, dma_get_cache_alignment()); |
| } |
| __always_inline static unsigned long align_buf_cache_offset(void *addr) |
| { |
| return (addr - align_buf_cache(addr)); |
| } |
| __always_inline static unsigned long align_buf_cache_size(void *addr, unsigned long size) |
| { |
| return align_val_up(size + align_buf_cache_offset(addr), dma_get_cache_alignment()); |
| } |
| |
| __always_inline static void flush_dcache_sizerange_safe(void *p, size_t size) |
| { |
| uintptr_t op_start = (uintptr_t) align_buf_cache(p); |
| size_t op_size = align_buf_cache_size(p, size); |
| flush_dcache_range(op_start, op_start + op_size); |
| } |
| |
| __always_inline static void flush_and_inv_dcache_sizerange_safe(void *p, size_t size) |
| { |
| uintptr_t op_start = (uintptr_t) align_buf_cache(p); |
| size_t op_size = align_buf_cache_size(p, size); |
| flush_and_inv_dcache_range(op_start, op_start + op_size); |
| } |
| |
| __always_inline static void inv_dcache_sizerange_safe(void *p, size_t size) |
| { |
| uintptr_t op_start = (uintptr_t) align_buf_cache(p); |
| size_t op_size = align_buf_cache_size(p, size); |
| inv_dcache_range(op_start, op_start + op_size); |
| } |
| |
| #endif // __ASSEMBLY__ |
| #endif // __QTN_DMA_UTIL_H |
| |