hexagon: use generic dma_noncoherent_ops
Switch to the generic noncoherent direct mapping implementation. Signed-off-by: Christoph Hellwig <hch@lst.de>hifive-unleashed-5.1
Christoph Hellwig
parent
f406f222d4
commit
e0a9317d90
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@ -4,6 +4,7 @@ comment "Linux Kernel Configuration for Hexagon"
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config HEXAGON
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def_bool y
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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select ARCH_NO_PREEMPT
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select HAVE_OPROFILE
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# Other pending projects/to-do items.
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@ -29,6 +30,7 @@ config HEXAGON
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select GENERIC_CLOCKEVENTS_BROADCAST
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select MODULES_USE_ELF_RELA
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select GENERIC_CPU_DEVICES
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select DMA_NONCOHERENT_OPS
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---help---
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Qualcomm Hexagon is a processor architecture designed for high
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performance and low power across a wide variety of applications.
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@ -6,6 +6,7 @@ generic-y += compat.h
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generic-y += current.h
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generic-y += device.h
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generic-y += div64.h
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generic-y += dma-mapping.h
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generic-y += emergency-restart.h
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generic-y += extable.h
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generic-y += fb.h
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@ -1,40 +0,0 @@
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/*
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* DMA operations for the Hexagon architecture
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*
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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.
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*/
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#ifndef _ASM_DMA_MAPPING_H
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#define _ASM_DMA_MAPPING_H
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <asm/io.h>
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struct device;
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extern const struct dma_map_ops *dma_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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return dma_ops;
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}
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#endif
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@ -18,32 +18,19 @@
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* 02110-1301, USA.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/bootmem.h>
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#include <linux/genalloc.h>
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#include <asm/dma-mapping.h>
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#include <linux/module.h>
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#include <asm/page.h>
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#define HEXAGON_MAPPING_ERROR 0
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const struct dma_map_ops *dma_ops;
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EXPORT_SYMBOL(dma_ops);
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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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}
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static struct gen_pool *coherent_pool;
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/* Allocates from a pool of uncached memory that was reserved at boot time */
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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)
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{
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void *ret;
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@ -75,58 +62,17 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
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return ret;
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}
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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)
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{
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gen_pool_free(coherent_pool, (unsigned long) vaddr, size);
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}
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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(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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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);
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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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WARN_ON(nents == 0 || sg[0].length == 0);
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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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s->dma_length = s->length;
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if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
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continue;
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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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return nents;
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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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{
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switch (dir) {
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case DMA_TO_DEVICE:
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hexagon_clean_dcache_range((unsigned long) addr,
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@ -144,81 +90,3 @@ static inline void dma_sync(void *addr, size_t size,
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BUG();
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}
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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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if (!check_addr("map_single", dev, bus, size))
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return HEXAGON_MAPPING_ERROR;
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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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return bus;
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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);
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}
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static void hexagon_sync_sg_for_device(struct device *dev,
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struct scatterlist *sgl, int nents, enum dma_data_direction dir)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sgl, sg, nents, i)
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hexagon_sync_single_for_device(dev, sg_dma_address(sg),
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sg->length, dir);
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}
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static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return dma_addr == HEXAGON_MAPPING_ERROR;
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}
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const struct dma_map_ops hexagon_dma_ops = {
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.alloc = hexagon_dma_alloc_coherent,
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.free = hexagon_free_coherent,
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.map_sg = hexagon_map_sg,
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.map_page = hexagon_map_page,
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.sync_single_for_device = hexagon_sync_single_for_device,
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.sync_sg_for_device = hexagon_sync_sg_for_device,
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.mapping_error = hexagon_mapping_error,
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};
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void __init hexagon_dma_init(void)
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{
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if (dma_ops)
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return;
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dma_ops = &hexagon_dma_ops;
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}
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