blob: fa983a59c4ce1084d939da4ea6fce17d91036f2a [file] [log] [blame]
Paul Mackerras2e686bc2005-10-06 13:22:17 +10001#include <linux/string.h>
2#include <linux/kernel.h>
Stephen Rothwellf85ff302007-05-01 16:40:36 +10003#include <linux/of.h>
Paul Mackerras2e686bc2005-10-06 13:22:17 +10004#include <linux/init.h>
5#include <linux/module.h>
6#include <linux/mod_devicetable.h>
Paul Mackerras734d6522005-10-31 13:57:01 +11007#include <linux/slab.h>
Jon Loeliger0173d422008-01-08 05:07:15 +11008#include <linux/of_device.h>
Paul Mackerras734d6522005-10-31 13:57:01 +11009
Paul Mackerras2e686bc2005-10-06 13:22:17 +100010#include <asm/errno.h>
Joachim Fenkesfec738d2007-09-26 19:44:12 +100011#include <asm/dcr.h>
Paul Mackerras2e686bc2005-10-06 13:22:17 +100012
Joachim Fenkesfec738d2007-09-26 19:44:12 +100013static void of_device_make_bus_id(struct of_device *dev)
14{
15 static atomic_t bus_no_reg_magic;
16 struct device_node *node = dev->node;
Joachim Fenkesfec738d2007-09-26 19:44:12 +100017 const u32 *reg;
18 u64 addr;
19 int magic;
20
21 /*
22 * If it's a DCR based device, use 'd' for native DCRs
23 * and 'D' for MMIO DCRs.
24 */
25#ifdef CONFIG_PPC_DCR
26 reg = of_get_property(node, "dcr-reg", NULL);
27 if (reg) {
28#ifdef CONFIG_PPC_DCR_NATIVE
Kay Sieversaab0d372008-12-04 10:02:56 -080029 dev_set_name(&dev->dev, "d%x.%s", *reg, node->name);
Joachim Fenkesfec738d2007-09-26 19:44:12 +100030#else /* CONFIG_PPC_DCR_NATIVE */
31 addr = of_translate_dcr_address(node, *reg, NULL);
32 if (addr != OF_BAD_ADDR) {
Kay Sieversaab0d372008-12-04 10:02:56 -080033 dev_set_name(&dev->dev, "D%llx.%s",
34 (unsigned long long)addr, node->name);
Joachim Fenkesfec738d2007-09-26 19:44:12 +100035 return;
36 }
37#endif /* !CONFIG_PPC_DCR_NATIVE */
38 }
39#endif /* CONFIG_PPC_DCR */
40
41 /*
42 * For MMIO, get the physical address
43 */
44 reg = of_get_property(node, "reg", NULL);
45 if (reg) {
46 addr = of_translate_address(node, reg);
47 if (addr != OF_BAD_ADDR) {
Kay Sieversaab0d372008-12-04 10:02:56 -080048 dev_set_name(&dev->dev, "%llx.%s",
49 (unsigned long long)addr, node->name);
Joachim Fenkesfec738d2007-09-26 19:44:12 +100050 return;
51 }
52 }
53
54 /*
55 * No BusID, use the node name and add a globally incremented
56 * counter (and pray...)
57 */
58 magic = atomic_add_return(1, &bus_no_reg_magic);
Kay Sieversaab0d372008-12-04 10:02:56 -080059 dev_set_name(&dev->dev, "%s.%d", node->name, magic - 1);
Joachim Fenkesfec738d2007-09-26 19:44:12 +100060}
61
62struct of_device *of_device_alloc(struct device_node *np,
63 const char *bus_id,
64 struct device *parent)
65{
66 struct of_device *dev;
67
68 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
69 if (!dev)
70 return NULL;
71
72 dev->node = of_node_get(np);
73 dev->dev.dma_mask = &dev->dma_mask;
74 dev->dev.parent = parent;
75 dev->dev.release = of_release_dev;
76 dev->dev.archdata.of_node = np;
Joachim Fenkesfec738d2007-09-26 19:44:12 +100077
78 if (bus_id)
Kay Sieversaab0d372008-12-04 10:02:56 -080079 dev_set_name(&dev->dev, bus_id);
Joachim Fenkesfec738d2007-09-26 19:44:12 +100080 else
81 of_device_make_bus_id(dev);
82
83 return dev;
84}
85EXPORT_SYMBOL(of_device_alloc);
86
Kay Sievers7eff2e72007-08-14 15:15:12 +020087int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +010088{
89 struct of_device *ofdev;
90 const char *compat;
Kay Sievers7eff2e72007-08-14 15:15:12 +020091 int seen = 0, cplen, sl;
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +010092
93 if (!dev)
94 return -ENODEV;
95
96 ofdev = to_of_device(dev);
97
Kay Sievers7eff2e72007-08-14 15:15:12 +020098 if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +010099 return -ENOMEM;
100
Kay Sievers7eff2e72007-08-14 15:15:12 +0200101 if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100102 return -ENOMEM;
103
104 /* Since the compatible field can contain pretty much anything
105 * it's not really legal to split it out with commas. We split it
106 * up using a number of environment variables instead. */
107
Stephen Rothwellb3a6d2a2007-04-13 17:14:22 +1000108 compat = of_get_property(ofdev->node, "compatible", &cplen);
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100109 while (compat && *compat && cplen > 0) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200110 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100111 return -ENOMEM;
112
113 sl = strlen (compat) + 1;
114 compat += sl;
115 cplen -= sl;
116 seen++;
117 }
118
Kay Sievers7eff2e72007-08-14 15:15:12 +0200119 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100120 return -ENOMEM;
121
122 /* modalias is trickier, we add it in 2 steps */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200123 if (add_uevent_var(env, "MODALIAS="))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100124 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200125 sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
126 sizeof(env->buf) - env->buflen);
127 if (sl >= (sizeof(env->buf) - env->buflen))
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100128 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200129 env->buflen += sl;
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100130
131 return 0;
132}
Sylvain Munauteb0cb8a2007-02-12 23:13:25 +0100133EXPORT_SYMBOL(of_device_uevent);
Sylvain Munautde411892007-05-07 01:38:46 +1000134EXPORT_SYMBOL(of_device_get_modalias);