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-rw-r--r--drivers/amba/bus.c113
1 files changed, 65 insertions, 48 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 9e3e2a69c03a..fd5475071acc 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -80,12 +80,38 @@ static int amba_resume(struct device *dev)
80 return ret; 80 return ret;
81} 81}
82 82
83#define amba_attr_func(name,fmt,arg...) \
84static ssize_t name##_show(struct device *_dev, \
85 struct device_attribute *attr, char *buf) \
86{ \
87 struct amba_device *dev = to_amba_device(_dev); \
88 return sprintf(buf, fmt, arg); \
89}
90
91#define amba_attr(name,fmt,arg...) \
92amba_attr_func(name,fmt,arg) \
93static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
94
95amba_attr_func(id, "%08x\n", dev->periphid);
96amba_attr(irq0, "%u\n", dev->irq[0]);
97amba_attr(irq1, "%u\n", dev->irq[1]);
98amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
99 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
100 dev->res.flags);
101
102static struct device_attribute amba_dev_attrs[] = {
103 __ATTR_RO(id),
104 __ATTR_RO(resource),
105 __ATTR_NULL,
106};
107
83/* 108/*
84 * Primecells are part of the Advanced Microcontroller Bus Architecture, 109 * Primecells are part of the Advanced Microcontroller Bus Architecture,
85 * so we call the bus "amba". 110 * so we call the bus "amba".
86 */ 111 */
87static struct bus_type amba_bustype = { 112static struct bus_type amba_bustype = {
88 .name = "amba", 113 .name = "amba",
114 .dev_attrs = amba_dev_attrs,
89 .match = amba_match, 115 .match = amba_match,
90 .uevent = amba_uevent, 116 .uevent = amba_uevent,
91 .suspend = amba_suspend, 117 .suspend = amba_suspend,
@@ -169,21 +195,6 @@ static void amba_device_release(struct device *dev)
169 kfree(d); 195 kfree(d);
170} 196}
171 197
172#define amba_attr(name,fmt,arg...) \
173static ssize_t show_##name(struct device *_dev, struct device_attribute *attr, char *buf) \
174{ \
175 struct amba_device *dev = to_amba_device(_dev); \
176 return sprintf(buf, fmt, arg); \
177} \
178static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
179
180amba_attr(id, "%08x\n", dev->periphid);
181amba_attr(irq0, "%u\n", dev->irq[0]);
182amba_attr(irq1, "%u\n", dev->irq[1]);
183amba_attr(resource, "\t%016llx\t%016llx\t%016lx\n",
184 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
185 dev->res.flags);
186
187/** 198/**
188 * amba_device_register - register an AMBA device 199 * amba_device_register - register an AMBA device
189 * @dev: AMBA device to register 200 * @dev: AMBA device to register
@@ -208,40 +219,46 @@ int amba_device_register(struct amba_device *dev, struct resource *parent)
208 dev_warn(&dev->dev, "coherent dma mask is unset\n"); 219 dev_warn(&dev->dev, "coherent dma mask is unset\n");
209 220
210 ret = request_resource(parent, &dev->res); 221 ret = request_resource(parent, &dev->res);
211 if (ret == 0) { 222 if (ret)
212 tmp = ioremap(dev->res.start, SZ_4K); 223 goto err_out;
213 if (!tmp) { 224
214 ret = -ENOMEM; 225 tmp = ioremap(dev->res.start, SZ_4K);
215 goto out; 226 if (!tmp) {
216 } 227 ret = -ENOMEM;
217 228 goto err_release;
218 for (pid = 0, i = 0; i < 4; i++)
219 pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8);
220 for (cid = 0, i = 0; i < 4; i++)
221 cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8);
222
223 iounmap(tmp);
224
225 if (cid == 0xb105f00d)
226 dev->periphid = pid;
227
228 if (dev->periphid)
229 ret = device_register(&dev->dev);
230 else
231 ret = -ENODEV;
232
233 if (ret == 0) {
234 device_create_file(&dev->dev, &dev_attr_id);
235 if (dev->irq[0] != NO_IRQ)
236 device_create_file(&dev->dev, &dev_attr_irq0);
237 if (dev->irq[1] != NO_IRQ)
238 device_create_file(&dev->dev, &dev_attr_irq1);
239 device_create_file(&dev->dev, &dev_attr_resource);
240 } else {
241 out:
242 release_resource(&dev->res);
243 }
244 } 229 }
230
231 for (pid = 0, i = 0; i < 4; i++)
232 pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8);
233 for (cid = 0, i = 0; i < 4; i++)
234 cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8);
235
236 iounmap(tmp);
237
238 if (cid == 0xb105f00d)
239 dev->periphid = pid;
240
241 if (!dev->periphid) {
242 ret = -ENODEV;
243 goto err_release;
244 }
245
246 ret = device_register(&dev->dev);
247 if (ret)
248 goto err_release;
249
250 if (dev->irq[0] != NO_IRQ)
251 ret = device_create_file(&dev->dev, &dev_attr_irq0);
252 if (ret == 0 && dev->irq[1] != NO_IRQ)
253 ret = device_create_file(&dev->dev, &dev_attr_irq1);
254 if (ret == 0)
255 return ret;
256
257 device_unregister(&dev->dev);
258
259 err_release:
260 release_resource(&dev->res);
261 err_out:
245 return ret; 262 return ret;
246} 263}
247 264