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/arch/powerpc/platforms/cell/beat_iommu.c

http://github.com/mirrors/linux
C | 115 lines | 73 code | 21 blank | 21 comment | 5 complexity | 00a3876bf9eb04482c0dcc44e788b212 MD5 | raw file
  1/*
  2 * Support for IOMMU on Celleb platform.
  3 *
  4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License along
 17 * with this program; if not, write to the Free Software Foundation, Inc.,
 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 19 */
 20
 21#include <linux/kernel.h>
 22#include <linux/init.h>
 23#include <linux/dma-mapping.h>
 24#include <linux/pci.h>
 25#include <linux/of_platform.h>
 26
 27#include <asm/machdep.h>
 28
 29#include "beat_wrapper.h"
 30
 31#define DMA_FLAGS 0xf800000000000000UL	/* r/w permitted, coherency required,
 32					   strongest order */
 33
 34static int __init find_dma_window(u64 *io_space_id, u64 *ioid,
 35				  u64 *base, u64 *size, u64 *io_page_size)
 36{
 37	struct device_node *dn;
 38	const unsigned long *dma_window;
 39
 40	for_each_node_by_type(dn, "ioif") {
 41		dma_window = of_get_property(dn, "toshiba,dma-window", NULL);
 42		if (dma_window) {
 43			*io_space_id = (dma_window[0] >> 32) & 0xffffffffUL;
 44			*ioid = dma_window[0] & 0x7ffUL;
 45			*base = dma_window[1];
 46			*size = dma_window[2];
 47			*io_page_size = 1 << dma_window[3];
 48			of_node_put(dn);
 49			return 1;
 50		}
 51	}
 52	return 0;
 53}
 54
 55static unsigned long celleb_dma_direct_offset;
 56
 57static void __init celleb_init_direct_mapping(void)
 58{
 59	u64 lpar_addr, io_addr;
 60	u64 io_space_id, ioid, dma_base, dma_size, io_page_size;
 61
 62	if (!find_dma_window(&io_space_id, &ioid, &dma_base, &dma_size,
 63			     &io_page_size)) {
 64		pr_info("No dma window found !\n");
 65		return;
 66	}
 67
 68	for (lpar_addr = 0; lpar_addr < dma_size; lpar_addr += io_page_size) {
 69		io_addr = lpar_addr + dma_base;
 70		(void)beat_put_iopte(io_space_id, io_addr, lpar_addr,
 71				     ioid, DMA_FLAGS);
 72	}
 73
 74	celleb_dma_direct_offset = dma_base;
 75}
 76
 77static void celleb_dma_dev_setup(struct device *dev)
 78{
 79	set_dma_ops(dev, &dma_direct_ops);
 80	set_dma_offset(dev, celleb_dma_direct_offset);
 81}
 82
 83static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
 84{
 85	celleb_dma_dev_setup(&pdev->dev);
 86}
 87
 88static int celleb_of_bus_notify(struct notifier_block *nb,
 89				unsigned long action, void *data)
 90{
 91	struct device *dev = data;
 92
 93	/* We are only intereted in device addition */
 94	if (action != BUS_NOTIFY_ADD_DEVICE)
 95		return 0;
 96
 97	celleb_dma_dev_setup(dev);
 98
 99	return 0;
100}
101
102static struct notifier_block celleb_of_bus_notifier = {
103	.notifier_call = celleb_of_bus_notify
104};
105
106static int __init celleb_init_iommu(void)
107{
108	celleb_init_direct_mapping();
109	ppc_md.pci_dma_dev_setup = celleb_pci_dma_dev_setup;
110	bus_register_notifier(&platform_bus_type, &celleb_of_bus_notifier);
111
112	return 0;
113}
114
115machine_arch_initcall(celleb_beat, celleb_init_iommu);