/*
* arch/sh/mm/consistent.c
*
- * Copyright (C) 2004 Paul Mundt
+ * Copyright (C) 2004 - 2007 Paul Mundt
+ *
+ * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
+#include <linux/io.h>
+#include <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/addrspace.h>
-#include <asm/io.h>
-void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle)
+#define PREALLOC_DMA_DEBUG_ENTRIES 4096
+
+struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static int __init dma_init(void)
{
- struct page *page, *end, *free;
- void *ret;
- int order;
+ dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+ return 0;
+}
+fs_initcall(dma_init);
- size = PAGE_ALIGN(size);
- order = get_order(size);
+void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ void *ret, *ret_nocache;
+ int order = get_order(size);
- page = alloc_pages(gfp, order);
- if (!page)
+ ret = (void *)__get_free_pages(gfp, order);
+ if (!ret)
return NULL;
- split_page(page, order);
- ret = page_address(page);
memset(ret, 0, size);
- *handle = virt_to_phys(ret);
-
/*
- * We must flush the cache before we pass it on to the device
+ * Pages from the page allocator may have data present in
+ * cache. So flush the cache before using uncached memory.
*/
- dma_cache_wback_inv(ret, size);
+ dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
- page = virt_to_page(ret);
- free = page + (size >> PAGE_SHIFT);
- end = page + (1 << order);
-
- while (++page < end) {
- /* Free any unused pages */
- if (page >= free) {
- __free_page(page);
- }
+ ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
+ if (!ret_nocache) {
+ free_pages((unsigned long)ret, order);
+ return NULL;
}
- return P2SEGADDR(ret);
+ split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
+
+ *dma_handle = virt_to_phys(ret);
+
+ return ret_nocache;
}
-void consistent_free(void *vaddr, size_t size)
+void dma_generic_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
{
- unsigned long addr = P1SEGADDR((unsigned long)vaddr);
- struct page *page=virt_to_page(addr);
- int num_pages=(size+PAGE_SIZE-1) >> PAGE_SHIFT;
- int i;
+ int order = get_order(size);
+ unsigned long pfn = dma_handle >> PAGE_SHIFT;
+ int k;
- for(i=0;i<num_pages;i++) {
- __free_page((page+i));
- }
+ for (k = 0; k < (1 << order); k++)
+ __free_pages(pfn_to_page(pfn + k), 0);
+
+ iounmap(vaddr);
}
-void consistent_sync(void *vaddr, size_t size, int direction)
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction)
{
- void * p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
+#if defined(CONFIG_CPU_SH5) || defined(CONFIG_PMB)
+ void *p1addr = vaddr;
+#else
+ void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
+#endif
switch (direction) {
case DMA_FROM_DEVICE: /* invalidate only */
- dma_cache_inv(p1addr, size);
+ __flush_invalidate_region(p1addr, size);
break;
case DMA_TO_DEVICE: /* writeback only */
- dma_cache_wback(p1addr, size);
+ __flush_wback_region(p1addr, size);
break;
case DMA_BIDIRECTIONAL: /* writeback and invalidate */
- dma_cache_wback_inv(p1addr, size);
+ __flush_purge_region(p1addr, size);
break;
default:
BUG();
}
}
+EXPORT_SYMBOL(dma_cache_sync);
+
+static int __init memchunk_setup(char *str)
+{
+ return 1; /* accept anything that begins with "memchunk." */
+}
+__setup("memchunk.", memchunk_setup);
+
+static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
+{
+ char *p = boot_command_line;
+ int k = strlen(name);
+
+ while ((p = strstr(p, "memchunk."))) {
+ p += 9; /* strlen("memchunk.") */
+ if (!strncmp(name, p, k) && p[k] == '=') {
+ p += k + 1;
+ *sizep = memparse(p, NULL);
+ pr_info("%s: forcing memory chunk size to 0x%08lx\n",
+ name, *sizep);
+ break;
+ }
+ }
+}
-EXPORT_SYMBOL(consistent_alloc);
-EXPORT_SYMBOL(consistent_free);
-EXPORT_SYMBOL(consistent_sync);
+int __init platform_resource_setup_memory(struct platform_device *pdev,
+ char *name, unsigned long memsize)
+{
+ struct resource *r;
+ dma_addr_t dma_handle;
+ void *buf;
+ r = pdev->resource + pdev->num_resources - 1;
+ if (r->flags) {
+ pr_warning("%s: unable to find empty space for resource\n",
+ name);
+ return -EINVAL;
+ }
+
+ memchunk_cmdline_override(name, &memsize);
+ if (!memsize)
+ return 0;
+
+ buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
+ if (!buf) {
+ pr_warning("%s: unable to allocate memory\n", name);
+ return -ENOMEM;
+ }
+
+ memset(buf, 0, memsize);
+
+ r->flags = IORESOURCE_MEM;
+ r->start = dma_handle;
+ r->end = r->start + memsize - 1;
+ r->name = name;
+ return 0;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff