116 строки
3.0 KiB
C
116 строки
3.0 KiB
C
/*
|
|
* Support for IOMMU on Celleb platform.
|
|
*
|
|
* (C) Copyright 2006-2007 TOSHIBA CORPORATION
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
#include "beat_wrapper.h"
|
|
|
|
#define DMA_FLAGS 0xf800000000000000UL /* r/w permitted, coherency required,
|
|
strongest order */
|
|
|
|
static int __init find_dma_window(u64 *io_space_id, u64 *ioid,
|
|
u64 *base, u64 *size, u64 *io_page_size)
|
|
{
|
|
struct device_node *dn;
|
|
const unsigned long *dma_window;
|
|
|
|
for_each_node_by_type(dn, "ioif") {
|
|
dma_window = of_get_property(dn, "toshiba,dma-window", NULL);
|
|
if (dma_window) {
|
|
*io_space_id = (dma_window[0] >> 32) & 0xffffffffUL;
|
|
*ioid = dma_window[0] & 0x7ffUL;
|
|
*base = dma_window[1];
|
|
*size = dma_window[2];
|
|
*io_page_size = 1 << dma_window[3];
|
|
of_node_put(dn);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long celleb_dma_direct_offset;
|
|
|
|
static void __init celleb_init_direct_mapping(void)
|
|
{
|
|
u64 lpar_addr, io_addr;
|
|
u64 io_space_id, ioid, dma_base, dma_size, io_page_size;
|
|
|
|
if (!find_dma_window(&io_space_id, &ioid, &dma_base, &dma_size,
|
|
&io_page_size)) {
|
|
pr_info("No dma window found !\n");
|
|
return;
|
|
}
|
|
|
|
for (lpar_addr = 0; lpar_addr < dma_size; lpar_addr += io_page_size) {
|
|
io_addr = lpar_addr + dma_base;
|
|
(void)beat_put_iopte(io_space_id, io_addr, lpar_addr,
|
|
ioid, DMA_FLAGS);
|
|
}
|
|
|
|
celleb_dma_direct_offset = dma_base;
|
|
}
|
|
|
|
static void celleb_dma_dev_setup(struct device *dev)
|
|
{
|
|
set_dma_ops(dev, &dma_direct_ops);
|
|
set_dma_offset(dev, celleb_dma_direct_offset);
|
|
}
|
|
|
|
static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
|
|
{
|
|
celleb_dma_dev_setup(&pdev->dev);
|
|
}
|
|
|
|
static int celleb_of_bus_notify(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
|
|
/* We are only intereted in device addition */
|
|
if (action != BUS_NOTIFY_ADD_DEVICE)
|
|
return 0;
|
|
|
|
celleb_dma_dev_setup(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block celleb_of_bus_notifier = {
|
|
.notifier_call = celleb_of_bus_notify
|
|
};
|
|
|
|
static int __init celleb_init_iommu(void)
|
|
{
|
|
celleb_init_direct_mapping();
|
|
ppc_md.pci_dma_dev_setup = celleb_pci_dma_dev_setup;
|
|
bus_register_notifier(&platform_bus_type, &celleb_of_bus_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
machine_arch_initcall(celleb_beat, celleb_init_iommu);
|