Commit 79f8511c authored by Ganesan Ramalingam's avatar Ganesan Ramalingam Committed by Ralf Baechle

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
......@@ -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;
......
......@@ -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
obj-y += irq.o time.o
obj-y += nlm-dma.o
obj-$(CONFIG_SMP) += smp.o smpboot.o
obj-$(CONFIG_EARLY_PRINTK) += earlycons.o
/*
* 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);
}
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