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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/sh/mm/consistent.c
3 *
Paul Mundt8a7bcf02007-11-11 17:07:06 +09004 * Copyright (C) 2004 - 2007 Paul Mundt
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
Magnus Dammf93e97e2008-01-24 18:35:10 +09006 * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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>
Paul Mundt7b41f562009-04-14 15:22:15 +090013#include <linux/init.h>
Magnus Damm1eca5c92008-07-16 19:02:54 +090014#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/dma-mapping.h>
Paul Mundtf802d962009-04-09 10:36:54 -070016#include <linux/dma-debug.h>
Paul Mundt7b41f562009-04-14 15:22:15 +090017#include <linux/io.h>
Paul Mundt73c926b2009-10-20 12:55:56 +090018#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/gfp.h>
Paul Mundt26ff6c12006-09-27 15:13:36 +090020#include <asm/cacheflush.h>
21#include <asm/addrspace.h>
Paul Mundt7b41f562009-04-14 15:22:15 +090022
23#define PREALLOC_DMA_DEBUG_ENTRIES 4096
24
Paul Mundt73c926b2009-10-20 12:55:56 +090025struct dma_map_ops *dma_ops;
26EXPORT_SYMBOL(dma_ops);
27
Paul Mundt7b41f562009-04-14 15:22:15 +090028static int __init dma_init(void)
29{
30 dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
31 return 0;
32}
33fs_initcall(dma_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Paul Mundtf32154c92009-10-26 09:50:51 +090035void *dma_generic_alloc_coherent(struct device *dev, size_t size,
36 dma_addr_t *dma_handle, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
Magnus Damm2a3eeba2008-01-25 12:42:48 +090038 void *ret, *ret_nocache;
Magnus Dammf93e97e2008-01-24 18:35:10 +090039 int order = get_order(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Andrew Murray57682822010-08-04 16:38:35 +090041 gfp |= __GFP_ZERO;
42
Magnus Dammf93e97e2008-01-24 18:35:10 +090043 ret = (void *)__get_free_pages(gfp, order);
Magnus Damm2a3eeba2008-01-25 12:42:48 +090044 if (!ret)
45 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Magnus Damm2a3eeba2008-01-25 12:42:48 +090047 /*
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
Paul Mundtfa439722008-09-04 18:53:58 +090053 ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
Magnus Damm2a3eeba2008-01-25 12:42:48 +090054 if (!ret_nocache) {
55 free_pages((unsigned long)ret, order);
56 return NULL;
Magnus Dammf93e97e2008-01-24 18:35:10 +090057 }
Magnus Damm2a3eeba2008-01-25 12:42:48 +090058
Magnus Dammda9fdc82008-12-17 17:18:45 +090059 split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
60
Magnus Damm2a3eeba2008-01-25 12:42:48 +090061 *dma_handle = virt_to_phys(ret);
Paul Mundtf802d962009-04-09 10:36:54 -070062
Magnus Damm2a3eeba2008-01-25 12:42:48 +090063 return ret_nocache;
Magnus Dammf93e97e2008-01-24 18:35:10 +090064}
Magnus Dammf93e97e2008-01-24 18:35:10 +090065
Paul Mundtf32154c92009-10-26 09:50:51 +090066void dma_generic_free_coherent(struct device *dev, size_t size,
67 void *vaddr, dma_addr_t dma_handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
Magnus Dammf93e97e2008-01-24 18:35:10 +090069 int order = get_order(size);
Magnus Dammda9fdc82008-12-17 17:18:45 +090070 unsigned long pfn = dma_handle >> PAGE_SHIFT;
71 int k;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Paul Mundtf802d962009-04-09 10:36:54 -070073 for (k = 0; k < (1 << order); k++)
74 __free_pages(pfn_to_page(pfn + k), 0);
Paul Mundtf32154c92009-10-26 09:50:51 +090075
Paul Mundtf802d962009-04-09 10:36:54 -070076 iounmap(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
Magnus Dammf93e97e2008-01-24 18:35:10 +090079void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
80 enum dma_data_direction direction)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Paul Mundte2fcf742010-11-04 12:32:24 +090082 void *addr;
83
84 addr = __in_29bit_mode() ?
Paul Mundt3f9b85202011-05-31 14:38:29 +090085 (void *)CAC_ADDR((unsigned long)vaddr) : vaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 switch (direction) {
88 case DMA_FROM_DEVICE: /* invalidate only */
Paul Mundte2fcf742010-11-04 12:32:24 +090089 __flush_invalidate_region(addr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 break;
91 case DMA_TO_DEVICE: /* writeback only */
Paul Mundte2fcf742010-11-04 12:32:24 +090092 __flush_wback_region(addr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 break;
94 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
Paul Mundte2fcf742010-11-04 12:32:24 +090095 __flush_purge_region(addr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 break;
97 default:
98 BUG();
99 }
100}
Magnus Dammf93e97e2008-01-24 18:35:10 +0900101EXPORT_SYMBOL(dma_cache_sync);
Magnus Damm1eca5c92008-07-16 19:02:54 +0900102
Magnus Damm0c13bf12008-08-11 15:13:24 +0900103static int __init memchunk_setup(char *str)
104{
105 return 1; /* accept anything that begins with "memchunk." */
106}
107__setup("memchunk.", memchunk_setup);
108
Magnus Dammc773d8a2008-08-27 18:21:29 +0900109static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
Magnus Damm0c13bf12008-08-11 15:13:24 +0900110{
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
Magnus Dammc773d8a2008-08-27 18:21:29 +0900126int __init platform_resource_setup_memory(struct platform_device *pdev,
127 char *name, unsigned long memsize)
Magnus Damm1eca5c92008-07-16 19:02:54 +0900128{
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
Magnus Damm0c13bf12008-08-11 15:13:24 +0900140 memchunk_cmdline_override(name, &memsize);
141 if (!memsize)
142 return 0;
143
Magnus Damm1eca5c92008-07-16 19:02:54 +0900144 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}