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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/arch/xtensa/kernel/pci-dma.c
....@@ -1,10 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * DMA coherent memory allocation.
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- *
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- * This program is free software; you can redistribute  it and/or modify it
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- * under  the terms of  the GNU General  Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
84  *
95  * Copyright (C) 2002 - 2005 Tensilica Inc.
106  * Copyright (C) 2015 Cadence Design Systems Inc.
....@@ -15,8 +11,7 @@
1511  * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
1612  */
1713 
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-#include <linux/dma-contiguous.h>
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-#include <linux/dma-noncoherent.h>
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+#include <linux/dma-map-ops.h>
2015 #include <linux/dma-direct.h>
2116 #include <linux/gfp.h>
2217 #include <linux/highmem.h>
....@@ -48,8 +43,8 @@
4843 		}
4944 }
5045 
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-void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
5348 {
5449 	switch (dir) {
5550 	case DMA_BIDIRECTIONAL:
....@@ -66,8 +61,8 @@
6661 	}
6762 }
6863 
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-void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
7166 {
7267 	switch (dir) {
7368 	case DMA_BIDIRECTIONAL:
....@@ -85,128 +80,19 @@
8580 	}
8681 }
8782 
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+void arch_dma_prep_coherent(struct page *page, size_t size)
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+{
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+	__invalidate_dcache_range((unsigned long)page_address(page), size);
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+}
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+
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+/*
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+ * Memory caching is platform-dependent in noMMU xtensa configurations.
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+ * This function should be implemented in platform code in order to enable
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+ * coherent DMA memory operations when CONFIG_MMU is not enabled.
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+ */
8893 #ifdef CONFIG_MMU
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-bool platform_vaddr_cached(const void *p)
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-{
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-	unsigned long addr = (unsigned long)p;
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-
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-	return addr >= XCHAL_KSEG_CACHED_VADDR &&
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-	       addr - XCHAL_KSEG_CACHED_VADDR < XCHAL_KSEG_SIZE;
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-}
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-
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-bool platform_vaddr_uncached(const void *p)
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-{
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-	unsigned long addr = (unsigned long)p;
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-
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-	return addr >= XCHAL_KSEG_BYPASS_VADDR &&
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-	       addr - XCHAL_KSEG_BYPASS_VADDR < XCHAL_KSEG_SIZE;
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-}
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-
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-void *platform_vaddr_to_uncached(void *p)
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+void *arch_dma_set_uncached(void *p, size_t size)
10695 {
10796 	return p + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR;
10897 }
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-
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-void *platform_vaddr_to_cached(void *p)
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-{
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-	return p + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
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-}
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-#else
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-bool __attribute__((weak)) platform_vaddr_cached(const void *p)
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-{
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-	WARN_ONCE(1, "Default %s implementation is used\n", __func__);
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-	return true;
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-}
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-
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-bool __attribute__((weak)) platform_vaddr_uncached(const void *p)
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-{
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-	WARN_ONCE(1, "Default %s implementation is used\n", __func__);
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-	return false;
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-}
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-
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-void __attribute__((weak)) *platform_vaddr_to_uncached(void *p)
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-{
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-	WARN_ONCE(1, "Default %s implementation is used\n", __func__);
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-	return p;
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-}
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-
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-void __attribute__((weak)) *platform_vaddr_to_cached(void *p)
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-{
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-	WARN_ONCE(1, "Default %s implementation is used\n", __func__);
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-	return p;
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-}
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-#endif
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-
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-/*
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- * Note: We assume that the full memory space is always mapped to 'kseg'
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- *	 Otherwise we have to use page attributes (not implemented).
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- */
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-
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-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
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-		gfp_t flag, unsigned long attrs)
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-{
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-	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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-	struct page *page = NULL;
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-
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-	/* ignore region speicifiers */
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-
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-	flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
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-
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-	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
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-		flag |= GFP_DMA;
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-
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-	if (gfpflags_allow_blocking(flag))
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-		page = dma_alloc_from_contiguous(dev, count, get_order(size),
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-						 flag & __GFP_NOWARN);
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-
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-	if (!page)
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-		page = alloc_pages(flag, get_order(size));
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-
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-	if (!page)
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-		return NULL;
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-
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-	*handle = phys_to_dma(dev, page_to_phys(page));
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-
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-	if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
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-		return page;
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-	}
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-
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-#ifdef CONFIG_MMU
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-	if (PageHighMem(page)) {
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-		void *p;
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-
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-		p = dma_common_contiguous_remap(page, size, VM_MAP,
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-						pgprot_noncached(PAGE_KERNEL),
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-						__builtin_return_address(0));
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-		if (!p) {
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-			if (!dma_release_from_contiguous(dev, page, count))
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-				__free_pages(page, get_order(size));
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-		}
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-		return p;
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-	}
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-#endif
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-	BUG_ON(!platform_vaddr_cached(page_address(page)));
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-	__invalidate_dcache_range((unsigned long)page_address(page), size);
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-	return platform_vaddr_to_uncached(page_address(page));
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-}
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-
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-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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-		dma_addr_t dma_handle, unsigned long attrs)
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-{
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-	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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-	struct page *page;
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-
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-	if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) {
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-		page = vaddr;
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-	} else if (platform_vaddr_uncached(vaddr)) {
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-		page = virt_to_page(platform_vaddr_to_cached(vaddr));
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-	} else {
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-#ifdef CONFIG_MMU
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-		dma_common_free_remap(vaddr, size, VM_MAP);
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-#endif
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-		page = pfn_to_page(PHYS_PFN(dma_to_phys(dev, dma_handle)));
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-	}
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-
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-	if (!dma_release_from_contiguous(dev, page, count))
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-		__free_pages(page, get_order(size));
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-}
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+#endif /* CONFIG_MMU */