projects/linux·blob master · refs

179 lines · 3.9 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/string.h>
3#include <linux/kernel.h>
4#include <linux/export.h>
5#include <linux/errno.h>
6#include <linux/irq.h>
7#include <linux/of.h>
8#include <linux/of_platform.h>
9#include <linux/of_address.h>
10#include <linux/of_irq.h>
11#include <linux/platform_device.h>
12
13#include "of_device_common.h"
14
15unsigned int irq_of_parse_and_map(struct device_node *node, int index)
16{
17 struct platform_device *op = of_find_device_by_node(node);
18
19 if (!op || index >= op->archdata.num_irqs)
20 return 0;
21
22 return op->archdata.irqs[index];
23}
24EXPORT_SYMBOL(irq_of_parse_and_map);
25
26int of_address_to_resource(struct device_node *node, int index,
27 struct resource *r)
28{
29 struct platform_device *op = of_find_device_by_node(node);
30
31 if (!op || index >= op->num_resources)
32 return -EINVAL;
33
34 memcpy(r, &op->archdata.resource[index], sizeof(*r));
35 return 0;
36}
37EXPORT_SYMBOL_GPL(of_address_to_resource);
38
39void __iomem *of_iomap(struct device_node *node, int index)
40{
41 struct platform_device *op = of_find_device_by_node(node);
42 struct resource *r;
43
44 if (!op || index >= op->num_resources)
45 return NULL;
46
47 r = &op->archdata.resource[index];
48
49 return of_ioremap(r, 0, resource_size(r), (char *) r->name);
50}
51EXPORT_SYMBOL(of_iomap);
52
53/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
54 * BUS and propagate to all child platform_device objects.
55 */
56void of_propagate_archdata(struct platform_device *bus)
57{
58 struct dev_archdata *bus_sd = &bus->dev.archdata;
59 struct device_node *bus_dp = bus->dev.of_node;
60 struct device_node *dp;
61
62 for (dp = bus_dp->child; dp; dp = dp->sibling) {
63 struct platform_device *op = of_find_device_by_node(dp);
64
65 op->dev.archdata.iommu = bus_sd->iommu;
66 op->dev.archdata.stc = bus_sd->stc;
67 op->dev.archdata.host_controller = bus_sd->host_controller;
68 op->dev.archdata.numa_node = bus_sd->numa_node;
69 op->dev.dma_ops = bus->dev.dma_ops;
70
71 if (dp->child)
72 of_propagate_archdata(op);
73 }
74}
75
76static void get_cells(struct device_node *dp, int *addrc, int *sizec)
77{
78 if (addrc)
79 *addrc = of_n_addr_cells(dp);
80 if (sizec)
81 *sizec = of_n_size_cells(dp);
82}
83
84/*
85 * Default translator (generic bus)
86 */
87
88void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
89{
90 get_cells(dev, addrc, sizec);
91}
92
93/* Make sure the least significant 64-bits are in-range. Even
94 * for 3 or 4 cell values it is a good enough approximation.
95 */
96int of_out_of_range(const u32 *addr, const u32 *base,
97 const u32 *size, int na, int ns)
98{
99 u64 a = of_read_addr(addr, na);
100 u64 b = of_read_addr(base, na);
101
102 if (a < b)
103 return 1;
104
105 b += of_read_addr(size, ns);
106 if (a >= b)
107 return 1;
108
109 return 0;
110}
111
112int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
113{
114 u32 result[OF_MAX_ADDR_CELLS];
115 int i;
116
117 if (ns > 2) {
118 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
119 return -EINVAL;
120 }
121
122 if (of_out_of_range(addr, range, range + na + pna, na, ns))
123 return -EINVAL;
124
125 /* Start with the parent range base. */
126 memcpy(result, range + na, pna * 4);
127
128 /* Add in the child address offset. */
129 for (i = 0; i < na; i++)
130 result[pna - 1 - i] +=
131 (addr[na - 1 - i] -
132 range[na - 1 - i]);
133
134 memcpy(addr, result, pna * 4);
135
136 return 0;
137}
138
139unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
140{
141 if (flags)
142 return flags;
143 return IORESOURCE_MEM;
144}
145
146/*
147 * SBUS bus specific translator
148 */
149
150int of_bus_sbus_match(struct device_node *np)
151{
152 struct device_node *dp = np;
153
154 while (dp) {
155 if (of_node_name_eq(dp, "sbus") ||
156 of_node_name_eq(dp, "sbi"))
157 return 1;
158
159 /* Have a look at use_1to1_mapping(). We're trying
160 * to match SBUS if that's the top-level bus and we
161 * don't have some intervening real bus that provides
162 * ranges based translations.
163 */
164 if (of_property_present(dp, "ranges"))
165 break;
166
167 dp = dp->parent;
168 }
169
170 return 0;
171}
172
173void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
174{
175 if (addrc)
176 *addrc = 2;
177 if (sizec)
178 *sizec = 1;
179}