forked from Minki/linux
cf5621032f
A DMA zone is still needed with swiotlb, for coherent allocations. This doesn't affect platforms that don't use swiotlb or that don't call swiotlb_detect_4g(). Signed-off-by: Scott Wood <scottwood@freescale.com> Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
|
|
* Contains routines needed to support swiotlb for ppc.
|
|
*
|
|
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
|
|
* Author: Becky Bruce
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pci.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/swiotlb.h>
|
|
#include <asm/dma.h>
|
|
|
|
unsigned int ppc_swiotlb_enable;
|
|
|
|
static u64 swiotlb_powerpc_get_required(struct device *dev)
|
|
{
|
|
u64 end, mask, max_direct_dma_addr = dev->archdata.max_direct_dma_addr;
|
|
|
|
end = memblock_end_of_DRAM();
|
|
if (max_direct_dma_addr && end > max_direct_dma_addr)
|
|
end = max_direct_dma_addr;
|
|
end += get_dma_offset(dev);
|
|
|
|
mask = 1ULL << (fls64(end) - 1);
|
|
mask += mask - 1;
|
|
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* At the moment, all platforms that use this code only require
|
|
* swiotlb to be used if we're operating on HIGHMEM. Since
|
|
* we don't ever call anything other than map_sg, unmap_sg,
|
|
* map_page, and unmap_page on highmem, use normal dma_ops
|
|
* for everything else.
|
|
*/
|
|
struct dma_map_ops swiotlb_dma_ops = {
|
|
.alloc = dma_direct_alloc_coherent,
|
|
.free = dma_direct_free_coherent,
|
|
.mmap = dma_direct_mmap_coherent,
|
|
.map_sg = swiotlb_map_sg_attrs,
|
|
.unmap_sg = swiotlb_unmap_sg_attrs,
|
|
.dma_supported = swiotlb_dma_supported,
|
|
.map_page = swiotlb_map_page,
|
|
.unmap_page = swiotlb_unmap_page,
|
|
.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,
|
|
.get_required_mask = swiotlb_powerpc_get_required,
|
|
};
|
|
|
|
void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
|
|
{
|
|
struct pci_controller *hose;
|
|
struct dev_archdata *sd;
|
|
|
|
hose = pci_bus_to_host(pdev->bus);
|
|
sd = &pdev->dev.archdata;
|
|
sd->max_direct_dma_addr =
|
|
hose->dma_window_base_cur + hose->dma_window_size;
|
|
}
|
|
|
|
static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
struct dev_archdata *sd;
|
|
|
|
/* We are only intereted in device addition */
|
|
if (action != BUS_NOTIFY_ADD_DEVICE)
|
|
return 0;
|
|
|
|
sd = &dev->archdata;
|
|
sd->max_direct_dma_addr = 0;
|
|
|
|
/* May need to bounce if the device can't address all of DRAM */
|
|
if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
|
|
set_dma_ops(dev, &swiotlb_dma_ops);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
|
|
.notifier_call = ppc_swiotlb_bus_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
int __init swiotlb_setup_bus_notifier(void)
|
|
{
|
|
bus_register_notifier(&platform_bus_type,
|
|
&ppc_swiotlb_plat_bus_notifier);
|
|
return 0;
|
|
}
|
|
|
|
void __init swiotlb_detect_4g(void)
|
|
{
|
|
if ((memblock_end_of_DRAM() - 1) > 0xffffffff) {
|
|
ppc_swiotlb_enable = 1;
|
|
#ifdef CONFIG_ZONE_DMA32
|
|
limit_zone_pfn(ZONE_DMA32, (1ULL << 32) >> PAGE_SHIFT);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static int __init swiotlb_late_init(void)
|
|
{
|
|
if (ppc_swiotlb_enable) {
|
|
swiotlb_print_info();
|
|
set_pci_dma_ops(&swiotlb_dma_ops);
|
|
ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
|
|
} else {
|
|
swiotlb_free();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(swiotlb_late_init);
|