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Commit 79f8511c authored by Ganesan Ramalingam's avatar Ganesan Ramalingam Committed by Ralf Baechle
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MIPS: Netlogic: SWIOTLB dma ops for 32-bit DMA 



Add SWIOTLB config option and related files to Netlogic platform.

Some XLP SoC components like the SD/MMC interface cannot do DMA beyond
32-bit physical address. The SD/MMC driver can use memory outside this
range for IO, to support this we have to add bounce buffers implemented
by SWIOTLB.

Signed-off-by: default avatarJayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: Ganesan Ramalingam <ganesanr@broadcom.com>
Patchwork: https://patchwork.linux-mips.org/patch/5410/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 4954a9a2

arch/mips/include/asm/netlogic/common.h

+3 −0
Original line number Diff line number Diff line
@@ -76,6 +76,9 @@ void nlm_node_init(int node); 
extern struct plat_smp_ops nlm_smp_ops;

extern char nlm_reset_entry[], nlm_reset_entry_end[];



/* SWIOTLB */

extern struct dma_map_ops nlm_swiotlb_dma_ops;



extern unsigned int nlm_threads_per_core;

extern cpumask_t nlm_cpumask;

arch/mips/netlogic/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -51,4 +51,15 @@ endif 
config NLM_COMMON

	bool



config IOMMU_HELPER

	bool



config NEED_SG_DMA_LENGTH

	bool



config SWIOTLB

	def_bool y

	select NEED_SG_DMA_LENGTH

	select IOMMU_HELPER



endif

arch/mips/netlogic/common/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-y				+= irq.o time.o

obj-y				+= nlm-dma.o

obj-$(CONFIG_SMP)		+= smp.o smpboot.o

obj-$(CONFIG_EARLY_PRINTK)	+= earlycons.o

arch/mips/netlogic/common/nlm-dma.c

0 → 100644
+107 −0
Original line number Diff line number Diff line 
/*

*  Copyright (C) 2003-2013 Broadcom Corporation

*  All Rights Reserved

 *

 * This software is available to you under a choice of one of two

 * licenses.  You may choose to be licensed under the terms of the GNU

 * General Public License (GPL) Version 2, available from the file

 * COPYING in the main directory of this source tree, or the Broadcom

 * license below:

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN

 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <linux/dma-mapping.h>

#include <linux/scatterlist.h>

#include <linux/bootmem.h>

#include <linux/export.h>

#include <linux/swiotlb.h>

#include <linux/types.h>

#include <linux/init.h>

#include <linux/mm.h>



#include <asm/bootinfo.h>



static char *nlm_swiotlb;



static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,

	dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)

{

	void *ret;



	if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))

		return ret;



	/* ignore region specifiers */

	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);



#ifdef CONFIG_ZONE_DMA32

	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))

		gfp |= __GFP_DMA32;

#endif



	/* Don't invoke OOM killer */

	gfp |= __GFP_NORETRY;



	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);

}



static void nlm_dma_free_coherent(struct device *dev, size_t size,

	void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)

{

	int order = get_order(size);



	if (dma_release_from_coherent(dev, order, vaddr))

		return;



	swiotlb_free_coherent(dev, size, vaddr, dma_handle);

}



struct dma_map_ops nlm_swiotlb_dma_ops = {

	.alloc = nlm_dma_alloc_coherent,

	.free = nlm_dma_free_coherent,

	.map_page = swiotlb_map_page,

	.unmap_page = swiotlb_unmap_page,

	.map_sg = swiotlb_map_sg_attrs,

	.unmap_sg = swiotlb_unmap_sg_attrs,

	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,

	.sync_single_for_device = swiotlb_sync_single_for_device,

	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,

	.sync_sg_for_device = swiotlb_sync_sg_for_device,

	.mapping_error = swiotlb_dma_mapping_error,

	.dma_supported = swiotlb_dma_supported

};



void __init plat_swiotlb_setup(void)

{

	size_t swiotlbsize;

	unsigned long swiotlb_nslabs;



	swiotlbsize = 1 << 20; /* 1 MB for now */

	swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;

	swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);

	swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;



	nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);

	swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);

}