This source file includes following definitions.
- warp_device_probe
- warp_probe
- define_machine
- warp_post_info
- pika_dtm_register_shutdown
- pika_dtm_unregister_shutdown
- temp_isr
- pika_setup_leds
- pika_setup_critical_temp
- pika_dtm_check_fan
- pika_dtm_thread
- pika_dtm_start
- pika_dtm_register_shutdown
- pika_dtm_unregister_shutdown
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8 #include <linux/init.h>
9 #include <linux/of_platform.h>
10 #include <linux/kthread.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/delay.h>
14 #include <linux/of_gpio.h>
15 #include <linux/slab.h>
16 #include <linux/export.h>
17
18 #include <asm/machdep.h>
19 #include <asm/prom.h>
20 #include <asm/udbg.h>
21 #include <asm/time.h>
22 #include <asm/uic.h>
23 #include <asm/ppc4xx.h>
24 #include <asm/dma.h>
25
26
27 static const struct of_device_id warp_of_bus[] __initconst = {
28 { .compatible = "ibm,plb4", },
29 { .compatible = "ibm,opb", },
30 { .compatible = "ibm,ebc", },
31 {},
32 };
33
34 static int __init warp_device_probe(void)
35 {
36 of_platform_bus_probe(NULL, warp_of_bus, NULL);
37 return 0;
38 }
39 machine_device_initcall(warp, warp_device_probe);
40
41 static int __init warp_probe(void)
42 {
43 if (!of_machine_is_compatible("pika,warp"))
44 return 0;
45
46
47 ISA_DMA_THRESHOLD = ~0L;
48
49 return 1;
50 }
51
52 define_machine(warp) {
53 .name = "Warp",
54 .probe = warp_probe,
55 .progress = udbg_progress,
56 .init_IRQ = uic_init_tree,
57 .get_irq = uic_get_irq,
58 .restart = ppc4xx_reset_system,
59 .calibrate_decr = generic_calibrate_decr,
60 };
61
62
63 static int __init warp_post_info(void)
64 {
65 struct device_node *np;
66 void __iomem *fpga;
67 u32 post1, post2;
68
69
70 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
71 if (np == NULL)
72 return -ENOENT;
73
74 fpga = of_iomap(np, 0);
75 of_node_put(np);
76 if (fpga == NULL)
77 return -ENOENT;
78
79 post1 = in_be32(fpga + 0x40);
80 post2 = in_be32(fpga + 0x44);
81
82 iounmap(fpga);
83
84 if (post1 || post2)
85 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
86 else
87 printk(KERN_INFO "Warp POST OK\n");
88
89 return 0;
90 }
91
92
93 #ifdef CONFIG_SENSORS_AD7414
94
95 static LIST_HEAD(dtm_shutdown_list);
96 static void __iomem *dtm_fpga;
97 static unsigned green_led, red_led;
98
99
100 struct dtm_shutdown {
101 struct list_head list;
102 void (*func)(void *arg);
103 void *arg;
104 };
105
106
107 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
108 {
109 struct dtm_shutdown *shutdown;
110
111 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
112 if (shutdown == NULL)
113 return -ENOMEM;
114
115 shutdown->func = func;
116 shutdown->arg = arg;
117
118 list_add(&shutdown->list, &dtm_shutdown_list);
119
120 return 0;
121 }
122
123 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
124 {
125 struct dtm_shutdown *shutdown;
126
127 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
128 if (shutdown->func == func && shutdown->arg == arg) {
129 list_del(&shutdown->list);
130 kfree(shutdown);
131 return 0;
132 }
133
134 return -EINVAL;
135 }
136
137 static irqreturn_t temp_isr(int irq, void *context)
138 {
139 struct dtm_shutdown *shutdown;
140 int value = 1;
141
142 local_irq_disable();
143
144 gpio_set_value(green_led, 0);
145
146
147 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
148 shutdown->func(shutdown->arg);
149
150 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
151
152 while (1) {
153 if (dtm_fpga) {
154 unsigned reset = in_be32(dtm_fpga + 0x14);
155 out_be32(dtm_fpga + 0x14, reset);
156 }
157
158 gpio_set_value(red_led, value);
159 value ^= 1;
160 mdelay(500);
161 }
162
163
164 return IRQ_HANDLED;
165 }
166
167 static int pika_setup_leds(void)
168 {
169 struct device_node *np, *child;
170
171 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
172 if (!np) {
173 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
174 return -ENOENT;
175 }
176
177 for_each_child_of_node(np, child)
178 if (of_node_name_eq(child, "green"))
179 green_led = of_get_gpio(child, 0);
180 else if (of_node_name_eq(child, "red"))
181 red_led = of_get_gpio(child, 0);
182
183 of_node_put(np);
184
185 return 0;
186 }
187
188 static void pika_setup_critical_temp(struct device_node *np,
189 struct i2c_client *client)
190 {
191 int irq, rc;
192
193
194
195
196 pika_setup_leds();
197
198
199 i2c_smbus_write_byte_data(client, 2, 65);
200 i2c_smbus_write_byte_data(client, 3, 0);
201
202 irq = irq_of_parse_and_map(np, 0);
203 if (!irq) {
204 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
205 return;
206 }
207
208 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
209 if (rc) {
210 printk(KERN_ERR __FILE__
211 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
212 return;
213 }
214 }
215
216 static inline void pika_dtm_check_fan(void __iomem *fpga)
217 {
218 static int fan_state;
219 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
220
221 if (fan_state != fan) {
222 fan_state = fan;
223 if (fan)
224 printk(KERN_WARNING "Fan rotation error detected."
225 " Please check hardware.\n");
226 }
227 }
228
229 static int pika_dtm_thread(void __iomem *fpga)
230 {
231 struct device_node *np;
232 struct i2c_client *client;
233
234 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
235 if (np == NULL)
236 return -ENOENT;
237
238 client = of_find_i2c_device_by_node(np);
239 if (client == NULL) {
240 of_node_put(np);
241 return -ENOENT;
242 }
243
244 pika_setup_critical_temp(np, client);
245
246 of_node_put(np);
247
248 printk(KERN_INFO "Warp DTM thread running.\n");
249
250 while (!kthread_should_stop()) {
251 int val;
252
253 val = i2c_smbus_read_word_data(client, 0);
254 if (val < 0)
255 dev_dbg(&client->dev, "DTM read temp failed.\n");
256 else {
257 s16 temp = swab16(val);
258 out_be32(fpga + 0x20, temp);
259 }
260
261 pika_dtm_check_fan(fpga);
262
263 set_current_state(TASK_INTERRUPTIBLE);
264 schedule_timeout(HZ);
265 }
266
267 return 0;
268 }
269
270 static int __init pika_dtm_start(void)
271 {
272 struct task_struct *dtm_thread;
273 struct device_node *np;
274
275 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
276 if (np == NULL)
277 return -ENOENT;
278
279 dtm_fpga = of_iomap(np, 0);
280 of_node_put(np);
281 if (dtm_fpga == NULL)
282 return -ENOENT;
283
284
285 warp_post_info();
286
287 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
288 if (IS_ERR(dtm_thread)) {
289 iounmap(dtm_fpga);
290 return PTR_ERR(dtm_thread);
291 }
292
293 return 0;
294 }
295 machine_late_initcall(warp, pika_dtm_start);
296
297 #else
298
299 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
300 {
301 return 0;
302 }
303
304 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
305 {
306 return 0;
307 }
308
309 machine_late_initcall(warp, warp_post_info);
310
311 #endif
312
313 EXPORT_SYMBOL(pika_dtm_register_shutdown);
314 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);