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[POWERPC] Celleb: support iommu

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This patch creates Celleb platform dependent file to support iommu.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Ishizaki Kou 2007-02-02 16:39:34 +09:00 committed by Paul Mackerras
parent 7163c7c9d2
commit 97a9b58409
1 changed files with 104 additions and 0 deletions
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104
arch/powerpc/platforms/celleb/iommu.c Normal file
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/*
* 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 <asm/of_platform.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 = 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 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);
}
dma_direct_offset = dma_base;
}
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;
dev->archdata.dma_ops = pci_dma_ops;
return 0;
}
static struct notifier_block celleb_of_bus_notifier = {
.notifier_call = celleb_of_bus_notify
};
static int __init celleb_init_iommu(void)
{
if (!machine_is(celleb))
return -ENODEV;
celleb_init_direct_mapping();
pci_dma_ops = &dma_direct_ops;
bus_register_notifier(&of_platform_bus_type, &celleb_of_bus_notifier);
return 0;
}
arch_initcall(celleb_init_iommu);