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/mod_devicetable.h>
6 #include <linux/errno.h>
7 #include <linux/irq.h>
8 #include <linux/of.h>
9 #include <linux/of_platform.h>
10 #include <linux/of_address.h>
11 #include <linux/of_irq.h>
12 #include <linux/platform_device.h>
13
14 #include "of_device_common.h"
15
16 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
17 {
18 struct platform_device *op = of_find_device_by_node(node);
19
20 if (!op || index >= op->archdata.num_irqs)
21 return 0;
22
23 return op->archdata.irqs[index];
24 }
25 EXPORT_SYMBOL(irq_of_parse_and_map);
26
27 int of_address_to_resource(struct device_node *node, int index,
28 struct resource *r)
29 {
30 struct platform_device *op = of_find_device_by_node(node);
31
32 if (!op || index >= op->num_resources)
33 return -EINVAL;
34
35 memcpy(r, &op->archdata.resource[index], sizeof(*r));
36 return 0;
37 }
38 EXPORT_SYMBOL_GPL(of_address_to_resource);
39
40 void __iomem *of_iomap(struct device_node *node, int index)
41 {
42 struct platform_device *op = of_find_device_by_node(node);
43 struct resource *r;
44
45 if (!op || index >= op->num_resources)
46 return NULL;
47
48 r = &op->archdata.resource[index];
49
50 return of_ioremap(r, 0, resource_size(r), (char *) r->name);
51 }
52 EXPORT_SYMBOL(of_iomap);
53
54 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
55 * BUS and propagate to all child platform_device objects.
56 */
57 void of_propagate_archdata(struct platform_device *bus)
58 {
59 struct dev_archdata *bus_sd = &bus->dev.archdata;
60 struct device_node *bus_dp = bus->dev.of_node;
61 struct device_node *dp;
62
63 for (dp = bus_dp->child; dp; dp = dp->sibling) {
64 struct platform_device *op = of_find_device_by_node(dp);
65
66 op->dev.archdata.iommu = bus_sd->iommu;
67 op->dev.archdata.stc = bus_sd->stc;
68 op->dev.archdata.host_controller = bus_sd->host_controller;
69 op->dev.archdata.numa_node = bus_sd->numa_node;
70 op->dev.dma_ops = bus->dev.dma_ops;
71
72 if (dp->child)
73 of_propagate_archdata(op);
74 }
75 }
76
77 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
78 {
79 if (addrc)
80 *addrc = of_n_addr_cells(dp);
81 if (sizec)
82 *sizec = of_n_size_cells(dp);
83 }
84
85 /*
86 * Default translator (generic bus)
87 */
88
89 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
90 {
91 get_cells(dev, addrc, sizec);
92 }
93
94 /* Make sure the least significant 64-bits are in-range. Even
95 * for 3 or 4 cell values it is a good enough approximation.
96 */
97 int of_out_of_range(const u32 *addr, const u32 *base,
98 const u32 *size, int na, int ns)
99 {
100 u64 a = of_read_addr(addr, na);
101 u64 b = of_read_addr(base, na);
102
103 if (a < b)
104 return 1;
105
106 b += of_read_addr(size, ns);
107 if (a >= b)
108 return 1;
109
110 return 0;
111 }
112
113 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
114 {
115 u32 result[OF_MAX_ADDR_CELLS];
116 int i;
117
118 if (ns > 2) {
119 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
120 return -EINVAL;
121 }
122
123 if (of_out_of_range(addr, range, range + na + pna, na, ns))
124 return -EINVAL;
125
126 /* Start with the parent range base. */
127 memcpy(result, range + na, pna * 4);
128
129 /* Add in the child address offset. */
130 for (i = 0; i < na; i++)
131 result[pna - 1 - i] +=
132 (addr[na - 1 - i] -
133 range[na - 1 - i]);
134
135 memcpy(addr, result, pna * 4);
136
137 return 0;
138 }
139
140 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
141 {
142 if (flags)
143 return flags;
144 return IORESOURCE_MEM;
145 }
146
147 /*
148 * SBUS bus specific translator
149 */
150
151 int of_bus_sbus_match(struct device_node *np)
152 {
153 struct device_node *dp = np;
154
155 while (dp) {
156 if (of_node_name_eq(dp, "sbus") ||
157 of_node_name_eq(dp, "sbi"))
158 return 1;
159
160 /* Have a look at use_1to1_mapping(). We're trying
161 * to match SBUS if that's the top-level bus and we
162 * don't have some intervening real bus that provides
163 * ranges based translations.
164 */
165 if (of_property_present(dp, "ranges"))
166 break;
167
168 dp = dp->parent;
169 }
170
171 return 0;
172 }
173
174 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
175 {
176 if (addrc)
177 *addrc = 2;
178 if (sizec)
179 *sizec = 1;
180 }
181
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.