153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
|
|
* arch/sh/mm/consistent.c
|
|
*
|
|
* 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/platform_device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/io.h>
|
|
|
|
struct dma_coherent_mem {
|
|
void *virt_base;
|
|
u32 device_base;
|
|
int size;
|
|
int flags;
|
|
unsigned long *bitmap;
|
|
};
|
|
|
|
void *dma_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);
|
|
|
|
if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
|
|
return ret;
|
|
|
|
ret = (void *)__get_free_pages(gfp, order);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
memset(ret, 0, size);
|
|
/*
|
|
* Pages from the page allocator may have data present in
|
|
* cache. So flush the cache before using uncached memory.
|
|
*/
|
|
dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
|
|
|
|
ret_nocache = ioremap_nocache(virt_to_phys(ret), size);
|
|
if (!ret_nocache) {
|
|
free_pages((unsigned long)ret, order);
|
|
return NULL;
|
|
}
|
|
|
|
*dma_handle = virt_to_phys(ret);
|
|
return ret_nocache;
|
|
}
|
|
EXPORT_SYMBOL(dma_alloc_coherent);
|
|
|
|
void dma_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle)
|
|
{
|
|
struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
|
|
int order = get_order(size);
|
|
|
|
if (!dma_release_from_coherent(dev, order, vaddr)) {
|
|
WARN_ON(irqs_disabled()); /* for portability */
|
|
BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
|
|
free_pages((unsigned long)phys_to_virt(dma_handle), order);
|
|
iounmap(vaddr);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dma_free_coherent);
|
|
|
|
void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
#ifdef CONFIG_CPU_SH5
|
|
void *p1addr = vaddr;
|
|
#else
|
|
void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
|
|
#endif
|
|
|
|
switch (direction) {
|
|
case DMA_FROM_DEVICE: /* invalidate only */
|
|
__flush_invalidate_region(p1addr, size);
|
|
break;
|
|
case DMA_TO_DEVICE: /* writeback only */
|
|
__flush_wback_region(p1addr, size);
|
|
break;
|
|
case DMA_BIDIRECTIONAL: /* writeback and invalidate */
|
|
__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 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
int 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;
|
|
}
|