diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/m68k/kernel/dma.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/m68k/kernel/dma.c')
-rw-r--r-- | arch/m68k/kernel/dma.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c new file mode 100644 index 000000000..1c1b875fa --- /dev/null +++ b/arch/m68k/kernel/dma.c @@ -0,0 +1,80 @@ +/* + * 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. + */ + +#undef DEBUG + +#include <linux/dma-map-ops.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/export.h> + +#include <asm/cacheflush.h> + +#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) +void arch_dma_prep_coherent(struct page *page, size_t size) +{ + cache_push(page_to_phys(page), size); +} + +pgprot_t pgprot_dmacoherent(pgprot_t prot) +{ + if (CPU_IS_040_OR_060) { + pgprot_val(prot) &= ~_PAGE_CACHE040; + pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S; + } else { + pgprot_val(prot) |= _PAGE_NOCACHE030; + } + return prot; +} +#else + +#include <asm/cacheflush.h> + +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t gfp, unsigned long attrs) +{ + void *ret; + + if (dev == NULL || (*dev->dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *)__get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + return ret; +} + +void arch_dma_free(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, unsigned long attrs) +{ + free_pages((unsigned long)vaddr, get_order(size)); +} + +#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */ + +void arch_sync_dma_for_device(phys_addr_t handle, size_t size, + enum dma_data_direction dir) +{ + switch (dir) { + case DMA_BIDIRECTIONAL: + case DMA_TO_DEVICE: + cache_push(handle, size); + break; + case DMA_FROM_DEVICE: + cache_clear(handle, size); + break; + default: + pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n", + dir); + break; + } +} |