Merge Btrfs into fs/btrfs
[linux-2.6] / arch / powerpc / platforms / cell / beat_iommu.c
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
34 static 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
55 static unsigned long celleb_dma_direct_offset;
56
57 static 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
77 static void celleb_dma_dev_setup(struct device *dev)
78 {
79         dev->archdata.dma_ops = get_pci_dma_ops();
80         dev->archdata.dma_data = (void *)celleb_dma_direct_offset;
81 }
82
83 static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
84 {
85         celleb_dma_dev_setup(&pdev->dev);
86 }
87
88 static 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
102 static struct notifier_block celleb_of_bus_notifier = {
103         .notifier_call = celleb_of_bus_notify
104 };
105
106 static int __init celleb_init_iommu(void)
107 {
108         celleb_init_direct_mapping();
109         set_pci_dma_ops(&dma_direct_ops);
110         ppc_md.pci_dma_dev_setup = celleb_pci_dma_dev_setup;
111         bus_register_notifier(&of_platform_bus_type, &celleb_of_bus_notifier);
112
113         return 0;
114 }
115
116 machine_arch_initcall(celleb_beat, celleb_init_iommu);