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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/csky/mm/dma-mapping.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/csky/mm/dma-mapping.c')
-rw-r--r--arch/csky/mm/dma-mapping.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c
new file mode 100644
index 000000000..82447029f
--- /dev/null
+++ b/arch/csky/mm/dma-mapping.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/cache.h>
+#include <linux/dma-map-ops.h>
+#include <linux/genalloc.h>
+#include <linux/highmem.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/types.h>
+#include <asm/cache.h>
+
+static inline void cache_op(phys_addr_t paddr, size_t size,
+ void (*fn)(unsigned long start, unsigned long end))
+{
+ struct page *page = phys_to_page(paddr);
+ void *start = __va(page_to_phys(page));
+ unsigned long offset = offset_in_page(paddr);
+ size_t left = size;
+
+ do {
+ size_t len = left;
+
+ if (offset + len > PAGE_SIZE)
+ len = PAGE_SIZE - offset;
+
+ if (PageHighMem(page)) {
+ start = kmap_atomic(page);
+
+ fn((unsigned long)start + offset,
+ (unsigned long)start + offset + len);
+
+ kunmap_atomic(start);
+ } else {
+ fn((unsigned long)start + offset,
+ (unsigned long)start + offset + len);
+ }
+ offset = 0;
+
+ page++;
+ start += PAGE_SIZE;
+ left -= len;
+ } while (left);
+}
+
+static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
+{
+ memset((void *)start, 0, end - start);
+ dma_wbinv_range(start, end);
+}
+
+void arch_dma_prep_coherent(struct page *page, size_t size)
+{
+ cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
+}
+
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ cache_op(paddr, size, dma_wb_range);
+ break;
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(paddr, size, dma_wbinv_range);
+ break;
+ default:
+ BUG();
+ }
+}
+
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ return;
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ cache_op(paddr, size, dma_inv_range);
+ break;
+ default:
+ BUG();
+ }
+}