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1/*
2 * Copyright (C) 2004 - 2007 Paul Mundt
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 */
8#include <linux/mm.h>
9#include <linux/init.h>
10#include <linux/platform_device.h>
11#include <linux/dma-mapping.h>
12#include <linux/io.h>
13
14static int __init memchunk_setup(char *str)
15{
16 return 1; /* accept anything that begins with "memchunk." */
17}
18__setup("memchunk.", memchunk_setup);
19
20static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
21{
22 char *p = boot_command_line;
23 int k = strlen(name);
24
25 while ((p = strstr(p, "memchunk."))) {
26 p += 9; /* strlen("memchunk.") */
27 if (!strncmp(name, p, k) && p[k] == '=') {
28 p += k + 1;
29 *sizep = memparse(p, NULL);
30 pr_info("%s: forcing memory chunk size to 0x%08lx\n",
31 name, *sizep);
32 break;
33 }
34 }
35}
36
37int __init platform_resource_setup_memory(struct platform_device *pdev,
38 char *name, unsigned long memsize)
39{
40 struct resource *r;
41 dma_addr_t dma_handle;
42 void *buf;
43
44 r = pdev->resource + pdev->num_resources - 1;
45 if (r->flags) {
46 pr_warning("%s: unable to find empty space for resource\n",
47 name);
48 return -EINVAL;
49 }
50
51 memchunk_cmdline_override(name, &memsize);
52 if (!memsize)
53 return 0;
54
55 buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL);
56 if (!buf) {
57 pr_warning("%s: unable to allocate memory\n", name);
58 return -ENOMEM;
59 }
60
61 memset(buf, 0, memsize);
62
63 r->flags = IORESOURCE_MEM;
64 r->start = dma_handle;
65 r->end = r->start + memsize - 1;
66 r->name = name;
67 return 0;
68}
1/*
2 * arch/sh/mm/consistent.c
3 *
4 * Copyright (C) 2004 - 2007 Paul Mundt
5 *
6 * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12#include <linux/mm.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/dma-mapping.h>
16#include <linux/dma-debug.h>
17#include <linux/io.h>
18#include <linux/module.h>
19#include <linux/gfp.h>
20#include <asm/cacheflush.h>
21#include <asm/addrspace.h>
22
23#define PREALLOC_DMA_DEBUG_ENTRIES 4096
24
25struct dma_map_ops *dma_ops;
26EXPORT_SYMBOL(dma_ops);
27
28static int __init dma_init(void)
29{
30 dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
31 return 0;
32}
33fs_initcall(dma_init);
34
35void *dma_generic_alloc_coherent(struct device *dev, size_t size,
36 dma_addr_t *dma_handle, gfp_t gfp)
37{
38 void *ret, *ret_nocache;
39 int order = get_order(size);
40
41 gfp |= __GFP_ZERO;
42
43 ret = (void *)__get_free_pages(gfp, order);
44 if (!ret)
45 return NULL;
46
47 /*
48 * Pages from the page allocator may have data present in
49 * cache. So flush the cache before using uncached memory.
50 */
51 dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
52
53 ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
54 if (!ret_nocache) {
55 free_pages((unsigned long)ret, order);
56 return NULL;
57 }
58
59 split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
60
61 *dma_handle = virt_to_phys(ret);
62
63 return ret_nocache;
64}
65
66void dma_generic_free_coherent(struct device *dev, size_t size,
67 void *vaddr, dma_addr_t dma_handle)
68{
69 int order = get_order(size);
70 unsigned long pfn = dma_handle >> PAGE_SHIFT;
71 int k;
72
73 for (k = 0; k < (1 << order); k++)
74 __free_pages(pfn_to_page(pfn + k), 0);
75
76 iounmap(vaddr);
77}
78
79void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
80 enum dma_data_direction direction)
81{
82 void *addr;
83
84 addr = __in_29bit_mode() ?
85 (void *)CAC_ADDR((unsigned long)vaddr) : vaddr;
86
87 switch (direction) {
88 case DMA_FROM_DEVICE: /* invalidate only */
89 __flush_invalidate_region(addr, size);
90 break;
91 case DMA_TO_DEVICE: /* writeback only */
92 __flush_wback_region(addr, size);
93 break;
94 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
95 __flush_purge_region(addr, size);
96 break;
97 default:
98 BUG();
99 }
100}
101EXPORT_SYMBOL(dma_cache_sync);
102
103static int __init memchunk_setup(char *str)
104{
105 return 1; /* accept anything that begins with "memchunk." */
106}
107__setup("memchunk.", memchunk_setup);
108
109static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
110{
111 char *p = boot_command_line;
112 int k = strlen(name);
113
114 while ((p = strstr(p, "memchunk."))) {
115 p += 9; /* strlen("memchunk.") */
116 if (!strncmp(name, p, k) && p[k] == '=') {
117 p += k + 1;
118 *sizep = memparse(p, NULL);
119 pr_info("%s: forcing memory chunk size to 0x%08lx\n",
120 name, *sizep);
121 break;
122 }
123 }
124}
125
126int __init platform_resource_setup_memory(struct platform_device *pdev,
127 char *name, unsigned long memsize)
128{
129 struct resource *r;
130 dma_addr_t dma_handle;
131 void *buf;
132
133 r = pdev->resource + pdev->num_resources - 1;
134 if (r->flags) {
135 pr_warning("%s: unable to find empty space for resource\n",
136 name);
137 return -EINVAL;
138 }
139
140 memchunk_cmdline_override(name, &memsize);
141 if (!memsize)
142 return 0;
143
144 buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
145 if (!buf) {
146 pr_warning("%s: unable to allocate memory\n", name);
147 return -ENOMEM;
148 }
149
150 memset(buf, 0, memsize);
151
152 r->flags = IORESOURCE_MEM;
153 r->start = dma_handle;
154 r->end = r->start + memsize - 1;
155 r->name = name;
156 return 0;
157}