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