1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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
32
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
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