LXR linux/arch/powerpc/platforms/cell/beat

   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);
 116