1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.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_platform.h>
9 #include <linux/of_address.h>
10 #include <linux/of_device.h>
11 #include <linux/of_irq.h>
12 
13 #include "of_device_common.h"
14 
15 unsigned 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 }
24 EXPORT_SYMBOL(irq_of_parse_and_map);
25 
26 int 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 }
37 EXPORT_SYMBOL_GPL(of_address_to_resource);
38 
39 void __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 }
51 EXPORT_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  */
56 void 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 
70 		if (dp->child)
71 			of_propagate_archdata(op);
72 	}
73 }
74 
75 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
76 {
77 	if (addrc)
78 		*addrc = of_n_addr_cells(dp);
79 	if (sizec)
80 		*sizec = of_n_size_cells(dp);
81 }
82 
83 /*
84  * Default translator (generic bus)
85  */
86 
87 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
88 {
89 	get_cells(dev, addrc, sizec);
90 }
91 
92 /* Make sure the least significant 64-bits are in-range.  Even
93  * for 3 or 4 cell values it is a good enough approximation.
94  */
95 int of_out_of_range(const u32 *addr, const u32 *base,
96 		    const u32 *size, int na, int ns)
97 {
98 	u64 a = of_read_addr(addr, na);
99 	u64 b = of_read_addr(base, na);
100 
101 	if (a < b)
102 		return 1;
103 
104 	b += of_read_addr(size, ns);
105 	if (a >= b)
106 		return 1;
107 
108 	return 0;
109 }
110 
111 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
112 {
113 	u32 result[OF_MAX_ADDR_CELLS];
114 	int i;
115 
116 	if (ns > 2) {
117 		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
118 		return -EINVAL;
119 	}
120 
121 	if (of_out_of_range(addr, range, range + na + pna, na, ns))
122 		return -EINVAL;
123 
124 	/* Start with the parent range base.  */
125 	memcpy(result, range + na, pna * 4);
126 
127 	/* Add in the child address offset.  */
128 	for (i = 0; i < na; i++)
129 		result[pna - 1 - i] +=
130 			(addr[na - 1 - i] -
131 			 range[na - 1 - i]);
132 
133 	memcpy(addr, result, pna * 4);
134 
135 	return 0;
136 }
137 
138 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
139 {
140 	if (flags)
141 		return flags;
142 	return IORESOURCE_MEM;
143 }
144 
145 /*
146  * SBUS bus specific translator
147  */
148 
149 int of_bus_sbus_match(struct device_node *np)
150 {
151 	struct device_node *dp = np;
152 
153 	while (dp) {
154 		if (!strcmp(dp->name, "sbus") ||
155 		    !strcmp(dp->name, "sbi"))
156 			return 1;
157 
158 		/* Have a look at use_1to1_mapping().  We're trying
159 		 * to match SBUS if that's the top-level bus and we
160 		 * don't have some intervening real bus that provides
161 		 * ranges based translations.
162 		 */
163 		if (of_find_property(dp, "ranges", NULL) != NULL)
164 			break;
165 
166 		dp = dp->parent;
167 	}
168 
169 	return 0;
170 }
171 
172 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
173 {
174 	if (addrc)
175 		*addrc = 2;
176 	if (sizec)
177 		*sizec = 1;
178 }
179