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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /arch/m68k/kernel/dma.c
parentInitial commit. (diff)
downloadlinux-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.c80
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;
+ }
+}