1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/of.h>
5 #include <linux/export.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/errno.h>
8 #include <linux/irq.h>
9 #include <linux/of_platform.h>
10 #include <linux/of_address.h>
11 #include <linux/of_device.h>
12 #include <linux/of_irq.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 
71 		if (dp->child)
72 			of_propagate_archdata(op);
73 	}
74 }
75 
76 static 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 
88 void 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  */
96 int 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 
112 int 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 
139 unsigned 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 
150 int 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_find_property(dp, "ranges", NULL) != NULL)
165 			break;
166 
167 		dp = dp->parent;
168 	}
169 
170 	return 0;
171 }
172 
173 void 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 }
180