~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/frv/mb93090-mb00/pci-dma-nommu.c

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* pci-dma-nommu.c: Dynamic DMA mapping support for the FRV
  2  *
  3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Woodhouse (dwmw2@infradead.org)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/types.h>
 13 #include <linux/slab.h>
 14 #include <linux/export.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/list.h>
 17 #include <linux/pci.h>
 18 #include <asm/io.h>
 19 
 20 #if 1
 21 #define DMA_SRAM_START  dma_coherent_mem_start
 22 #define DMA_SRAM_END    dma_coherent_mem_end
 23 #else // Use video RAM on Matrox
 24 #define DMA_SRAM_START  0xe8900000
 25 #define DMA_SRAM_END    0xe8a00000
 26 #endif
 27 
 28 struct dma_alloc_record {
 29         struct list_head        list;
 30         unsigned long           ofs;
 31         unsigned long           len;
 32 };
 33 
 34 static DEFINE_SPINLOCK(dma_alloc_lock);
 35 static LIST_HEAD(dma_alloc_list);
 36 
 37 void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
 38 {
 39         struct dma_alloc_record *new;
 40         struct list_head *this = &dma_alloc_list;
 41         unsigned long flags;
 42         unsigned long start = DMA_SRAM_START;
 43         unsigned long end;
 44 
 45         if (!DMA_SRAM_START) {
 46                 printk("%s called without any DMA area reserved!\n", __func__);
 47                 return NULL;
 48         }
 49 
 50         new = kmalloc(sizeof (*new), GFP_ATOMIC);
 51         if (!new)
 52                 return NULL;
 53 
 54         /* Round up to a reasonable alignment */
 55         new->len = (size + 31) & ~31;
 56 
 57         spin_lock_irqsave(&dma_alloc_lock, flags);
 58 
 59         list_for_each (this, &dma_alloc_list) {
 60                 struct dma_alloc_record *this_r = list_entry(this, struct dma_alloc_record, list);
 61                 end = this_r->ofs;
 62 
 63                 if (end - start >= size)
 64                         goto gotone;
 65 
 66                 start = this_r->ofs + this_r->len;
 67         }
 68         /* Reached end of list. */
 69         end = DMA_SRAM_END;
 70         this = &dma_alloc_list;
 71 
 72         if (end - start >= size) {
 73         gotone:
 74                 new->ofs = start;
 75                 list_add_tail(&new->list, this);
 76                 spin_unlock_irqrestore(&dma_alloc_lock, flags);
 77 
 78                 *dma_handle = start;
 79                 return (void *)start;
 80         }
 81 
 82         kfree(new);
 83         spin_unlock_irqrestore(&dma_alloc_lock, flags);
 84         return NULL;
 85 }
 86 
 87 EXPORT_SYMBOL(dma_alloc_coherent);
 88 
 89 void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
 90 {
 91         struct dma_alloc_record *rec;
 92         unsigned long flags;
 93 
 94         spin_lock_irqsave(&dma_alloc_lock, flags);
 95 
 96         list_for_each_entry(rec, &dma_alloc_list, list) {
 97                 if (rec->ofs == dma_handle) {
 98                         list_del(&rec->list);
 99                         kfree(rec);
100                         spin_unlock_irqrestore(&dma_alloc_lock, flags);
101                         return;
102                 }
103         }
104         spin_unlock_irqrestore(&dma_alloc_lock, flags);
105         BUG();
106 }
107 
108 EXPORT_SYMBOL(dma_free_coherent);
109 
110 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
111                           enum dma_data_direction direction)
112 {
113         BUG_ON(direction == DMA_NONE);
114 
115         frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
116 
117         return virt_to_bus(ptr);
118 }
119 
120 EXPORT_SYMBOL(dma_map_single);
121 
122 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
123                enum dma_data_direction direction)
124 {
125         int i;
126 
127         for (i=0; i<nents; i++)
128                 frv_cache_wback_inv(sg_dma_address(&sg[i]),
129                                     sg_dma_address(&sg[i]) + sg_dma_len(&sg[i]));
130 
131         BUG_ON(direction == DMA_NONE);
132 
133         return nents;
134 }
135 
136 EXPORT_SYMBOL(dma_map_sg);
137 
138 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
139                         size_t size, enum dma_data_direction direction)
140 {
141         BUG_ON(direction == DMA_NONE);
142         flush_dcache_page(page);
143         return (dma_addr_t) page_to_phys(page) + offset;
144 }
145 
146 EXPORT_SYMBOL(dma_map_page);
147 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp