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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/arch/hexagon/kernel/dma.c
....@@ -1,49 +1,23 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * DMA implementation for Hexagon
34  *
45  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
5
- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 and
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- * only version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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- * 02110-1301, USA.
196  */
207 
21
-#include <linux/dma-mapping.h>
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-#include <linux/dma-direct.h>
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-#include <linux/bootmem.h>
8
+#include <linux/dma-map-ops.h>
9
+#include <linux/memblock.h>
2410 #include <linux/genalloc.h>
25
-#include <asm/dma-mapping.h>
2611 #include <linux/module.h>
2712 #include <asm/page.h>
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-
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-#define HEXAGON_MAPPING_ERROR	0
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-
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-const struct dma_map_ops *dma_ops;
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-EXPORT_SYMBOL(dma_ops);
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-
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-static inline void *dma_addr_to_virt(dma_addr_t dma_addr)
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-{
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-	return phys_to_virt((unsigned long) dma_addr);
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-}
3813 
3914 static struct gen_pool *coherent_pool;
4015 
4116 
4217 /* Allocates from a pool of uncached memory that was reserved at boot time */
4318 
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-static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
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-				 dma_addr_t *dma_addr, gfp_t flag,
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-				 unsigned long attrs)
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+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_addr,
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+		gfp_t flag, unsigned long attrs)
4721 {
4822 	void *ret;
4923 
....@@ -75,58 +49,17 @@
7549 	return ret;
7650 }
7751 
78
-static void hexagon_free_coherent(struct device *dev, size_t size, void *vaddr,
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-				  dma_addr_t dma_addr, unsigned long attrs)
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+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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+		dma_addr_t dma_addr, unsigned long attrs)
8054 {
8155 	gen_pool_free(coherent_pool, (unsigned long) vaddr, size);
8256 }
8357 
84
-static int check_addr(const char *name, struct device *hwdev,
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-		      dma_addr_t bus, size_t size)
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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)
8660 {
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-	if (hwdev && hwdev->dma_mask && !dma_capable(hwdev, bus, size)) {
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-		if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
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-			printk(KERN_ERR
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-				"%s: overflow %Lx+%zu of device mask %Lx\n",
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-				name, (long long)bus, size,
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-				(long long)*hwdev->dma_mask);
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-		return 0;
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-	}
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-	return 1;
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-}
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+	void *addr = phys_to_virt(paddr);
9762 
98
-static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg,
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-			  int nents, enum dma_data_direction dir,
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-			  unsigned long attrs)
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-{
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-	struct scatterlist *s;
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-	int i;
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-
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-	WARN_ON(nents == 0 || sg[0].length == 0);
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-
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-	for_each_sg(sg, s, nents, i) {
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-		s->dma_address = sg_phys(s);
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-		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
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-			return 0;
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-
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-		s->dma_length = s->length;
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-
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-		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
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-			continue;
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-
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-		flush_dcache_range(dma_addr_to_virt(s->dma_address),
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-				   dma_addr_to_virt(s->dma_address + s->length));
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-	}
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-
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-	return nents;
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-}
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-
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-/*
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- * address is virtual
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- */
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-static inline void dma_sync(void *addr, size_t size,
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-			    enum dma_data_direction dir)
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-{
13063 	switch (dir) {
13164 	case DMA_TO_DEVICE:
13265 		hexagon_clean_dcache_range((unsigned long) addr,
....@@ -143,77 +76,4 @@
14376 	default:
14477 		BUG();
14578 	}
146
-}
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-
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-/**
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- * hexagon_map_page() - maps an address for device DMA
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- * @dev:	pointer to DMA device
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- * @page:	pointer to page struct of DMA memory
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- * @offset:	offset within page
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- * @size:	size of memory to map
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- * @dir:	transfer direction
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- * @attrs:	pointer to DMA attrs (not used)
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- *
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- * Called to map a memory address to a DMA address prior
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- * to accesses to/from device.
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- *
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- * We don't particularly have many hoops to jump through
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- * so far.  Straight translation between phys and virtual.
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- *
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- * DMA is not cache coherent so sync is necessary; this
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- * seems to be a convenient place to do it.
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- *
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- */
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-static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
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-				   unsigned long offset, size_t size,
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-				   enum dma_data_direction dir,
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-				   unsigned long attrs)
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-{
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-	dma_addr_t bus = page_to_phys(page) + offset;
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-	WARN_ON(size == 0);
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-
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-	if (!check_addr("map_single", dev, bus, size))
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-		return HEXAGON_MAPPING_ERROR;
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-
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-	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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-		dma_sync(dma_addr_to_virt(bus), size, dir);
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-
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-	return bus;
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-}
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-
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-static void hexagon_sync_single_for_cpu(struct device *dev,
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-					dma_addr_t dma_handle, size_t size,
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-					enum dma_data_direction dir)
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-{
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-	dma_sync(dma_addr_to_virt(dma_handle), size, dir);
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-}
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-
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-static void hexagon_sync_single_for_device(struct device *dev,
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-					dma_addr_t dma_handle, size_t size,
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-					enum dma_data_direction dir)
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-{
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-	dma_sync(dma_addr_to_virt(dma_handle), size, dir);
196
-}
197
-
198
-static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)
199
-{
200
-	return dma_addr == HEXAGON_MAPPING_ERROR;
201
-}
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-
203
-const struct dma_map_ops hexagon_dma_ops = {
204
-	.alloc		= hexagon_dma_alloc_coherent,
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-	.free		= hexagon_free_coherent,
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-	.map_sg		= hexagon_map_sg,
207
-	.map_page	= hexagon_map_page,
208
-	.sync_single_for_cpu = hexagon_sync_single_for_cpu,
209
-	.sync_single_for_device = hexagon_sync_single_for_device,
210
-	.mapping_error	= hexagon_mapping_error,
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-};
212
-
213
-void __init hexagon_dma_init(void)
214
-{
215
-	if (dma_ops)
216
-		return;
217
-
218
-	dma_ops = &hexagon_dma_ops;
21979 }