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-rw-r--r--arch/sh/mm/consistent.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index b2ce014401b5..895bb3f335c7 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -95,6 +95,29 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
95} 95}
96EXPORT_SYMBOL(dma_cache_sync); 96EXPORT_SYMBOL(dma_cache_sync);
97 97
98static int __init memchunk_setup(char *str)
99{
100 return 1; /* accept anything that begins with "memchunk." */
101}
102__setup("memchunk.", memchunk_setup);
103
104static void memchunk_cmdline_override(char *name, unsigned long *sizep)
105{
106 char *p = boot_command_line;
107 int k = strlen(name);
108
109 while ((p = strstr(p, "memchunk."))) {
110 p += 9; /* strlen("memchunk.") */
111 if (!strncmp(name, p, k) && p[k] == '=') {
112 p += k + 1;
113 *sizep = memparse(p, NULL);
114 pr_info("%s: forcing memory chunk size to 0x%08lx\n",
115 name, *sizep);
116 break;
117 }
118 }
119}
120
98int platform_resource_setup_memory(struct platform_device *pdev, 121int platform_resource_setup_memory(struct platform_device *pdev,
99 char *name, unsigned long memsize) 122 char *name, unsigned long memsize)
100{ 123{
@@ -109,6 +132,10 @@ int platform_resource_setup_memory(struct platform_device *pdev,
109 return -EINVAL; 132 return -EINVAL;
110 } 133 }
111 134
135 memchunk_cmdline_override(name, &memsize);
136 if (!memsize)
137 return 0;
138
112 buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL); 139 buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
113 if (!buf) { 140 if (!buf) {
114 pr_warning("%s: unable to allocate memory\n", name); 141 pr_warning("%s: unable to allocate memory\n", name);