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