| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2003-2013 Broadcom Corporation |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This software is available to you under a choice of one of two |
| 6 | * licenses. You may choose to be licensed under the terms of the GNU |
| 7 | * General Public License (GPL) Version 2, available from the file |
| 8 | * COPYING in the main directory of this source tree, or the Broadcom |
| 9 | * license below: |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in |
| 19 | * the documentation and/or other materials provided with the |
| 20 | * distribution. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR |
| 23 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 24 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 31 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| 32 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | */ |
| 34 | #include <linux/dma-mapping.h> |
| 35 | #include <linux/scatterlist.h> |
| 36 | #include <linux/bootmem.h> |
| 37 | #include <linux/export.h> |
| 38 | #include <linux/swiotlb.h> |
| 39 | #include <linux/types.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/mm.h> |
| 42 | |
| 43 | #include <asm/bootinfo.h> |
| 44 | |
| 45 | static char *nlm_swiotlb; |
| 46 | |
| 47 | static void *nlm_dma_alloc_coherent(struct device *dev, size_t size, |
| 48 | dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs) |
| 49 | { |
| 50 | /* ignore region specifiers */ |
| 51 | gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); |
| 52 | |
| 53 | #ifdef CONFIG_ZONE_DMA32 |
| 54 | if (dev->coherent_dma_mask <= DMA_BIT_MASK(32)) |
| 55 | gfp |= __GFP_DMA32; |
| 56 | #endif |
| 57 | |
| 58 | /* Don't invoke OOM killer */ |
| 59 | gfp |= __GFP_NORETRY; |
| 60 | |
| 61 | return swiotlb_alloc_coherent(dev, size, dma_handle, gfp); |
| 62 | } |
| 63 | |
| 64 | static void nlm_dma_free_coherent(struct device *dev, size_t size, |
| 65 | void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs) |
| 66 | { |
| 67 | swiotlb_free_coherent(dev, size, vaddr, dma_handle); |
| 68 | } |
| 69 | |
| 70 | struct dma_map_ops nlm_swiotlb_dma_ops = { |
| 71 | .alloc = nlm_dma_alloc_coherent, |
| 72 | .free = nlm_dma_free_coherent, |
| 73 | .map_page = swiotlb_map_page, |
| 74 | .unmap_page = swiotlb_unmap_page, |
| 75 | .map_sg = swiotlb_map_sg_attrs, |
| 76 | .unmap_sg = swiotlb_unmap_sg_attrs, |
| 77 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
| 78 | .sync_single_for_device = swiotlb_sync_single_for_device, |
| 79 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, |
| 80 | .sync_sg_for_device = swiotlb_sync_sg_for_device, |
| 81 | .mapping_error = swiotlb_dma_mapping_error, |
| 82 | .dma_supported = swiotlb_dma_supported |
| 83 | }; |
| 84 | |
| 85 | void __init plat_swiotlb_setup(void) |
| 86 | { |
| 87 | size_t swiotlbsize; |
| 88 | unsigned long swiotlb_nslabs; |
| 89 | |
| 90 | swiotlbsize = 1 << 20; /* 1 MB for now */ |
| 91 | swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT; |
| 92 | swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE); |
| 93 | swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT; |
| 94 | |
| 95 | nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize); |
| 96 | swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1); |
| 97 | } |