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12#include <linux/init.h>
13#include <linux/of_platform.h>
14#include <linux/kthread.h>
15#include <linux/i2c.h>
16#include <linux/interrupt.h>
17#include <linux/delay.h>
18#include <linux/of_gpio.h>
19#include <linux/of_i2c.h>
20#include <linux/slab.h>
21
22#include <asm/machdep.h>
23#include <asm/prom.h>
24#include <asm/udbg.h>
25#include <asm/time.h>
26#include <asm/uic.h>
27#include <asm/ppc4xx.h>
28
29
30static __initdata struct of_device_id warp_of_bus[] = {
31 { .compatible = "ibm,plb4", },
32 { .compatible = "ibm,opb", },
33 { .compatible = "ibm,ebc", },
34 {},
35};
36
37static int __init warp_device_probe(void)
38{
39 of_platform_bus_probe(NULL, warp_of_bus, NULL);
40 return 0;
41}
42machine_device_initcall(warp, warp_device_probe);
43
44static int __init warp_probe(void)
45{
46 unsigned long root = of_get_flat_dt_root();
47
48 if (!of_flat_dt_is_compatible(root, "pika,warp"))
49 return 0;
50
51
52 ISA_DMA_THRESHOLD = ~0L;
53
54 return 1;
55}
56
57define_machine(warp) {
58 .name = "Warp",
59 .probe = warp_probe,
60 .progress = udbg_progress,
61 .init_IRQ = uic_init_tree,
62 .get_irq = uic_get_irq,
63 .restart = ppc4xx_reset_system,
64 .calibrate_decr = generic_calibrate_decr,
65};
66
67
68static int __init warp_post_info(void)
69{
70 struct device_node *np;
71 void __iomem *fpga;
72 u32 post1, post2;
73
74
75 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
76 if (np == NULL)
77 return -ENOENT;
78
79 fpga = of_iomap(np, 0);
80 of_node_put(np);
81 if (fpga == NULL)
82 return -ENOENT;
83
84 post1 = in_be32(fpga + 0x40);
85 post2 = in_be32(fpga + 0x44);
86
87 iounmap(fpga);
88
89 if (post1 || post2)
90 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
91 else
92 printk(KERN_INFO "Warp POST OK\n");
93
94 return 0;
95}
96
97
98#ifdef CONFIG_SENSORS_AD7414
99
100static LIST_HEAD(dtm_shutdown_list);
101static void __iomem *dtm_fpga;
102static unsigned green_led, red_led;
103
104
105struct dtm_shutdown {
106 struct list_head list;
107 void (*func)(void *arg);
108 void *arg;
109};
110
111
112int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
113{
114 struct dtm_shutdown *shutdown;
115
116 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
117 if (shutdown == NULL)
118 return -ENOMEM;
119
120 shutdown->func = func;
121 shutdown->arg = arg;
122
123 list_add(&shutdown->list, &dtm_shutdown_list);
124
125 return 0;
126}
127
128int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
129{
130 struct dtm_shutdown *shutdown;
131
132 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
133 if (shutdown->func == func && shutdown->arg == arg) {
134 list_del(&shutdown->list);
135 kfree(shutdown);
136 return 0;
137 }
138
139 return -EINVAL;
140}
141
142static irqreturn_t temp_isr(int irq, void *context)
143{
144 struct dtm_shutdown *shutdown;
145 int value = 1;
146
147 local_irq_disable();
148
149 gpio_set_value(green_led, 0);
150
151
152 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
153 shutdown->func(shutdown->arg);
154
155 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
156
157 while (1) {
158 if (dtm_fpga) {
159 unsigned reset = in_be32(dtm_fpga + 0x14);
160 out_be32(dtm_fpga + 0x14, reset);
161 }
162
163 gpio_set_value(red_led, value);
164 value ^= 1;
165 mdelay(500);
166 }
167
168
169 return IRQ_HANDLED;
170}
171
172static int pika_setup_leds(void)
173{
174 struct device_node *np, *child;
175
176 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
177 if (!np) {
178 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
179 return -ENOENT;
180 }
181
182 for_each_child_of_node(np, child)
183 if (strcmp(child->name, "green") == 0)
184 green_led = of_get_gpio(child, 0);
185 else if (strcmp(child->name, "red") == 0)
186 red_led = of_get_gpio(child, 0);
187
188 of_node_put(np);
189
190 return 0;
191}
192
193static void pika_setup_critical_temp(struct device_node *np,
194 struct i2c_client *client)
195{
196 int irq, rc;
197
198
199
200
201 pika_setup_leds();
202
203
204 i2c_smbus_write_byte_data(client, 2, 65);
205 i2c_smbus_write_byte_data(client, 3, 0);
206
207 irq = irq_of_parse_and_map(np, 0);
208 if (irq == NO_IRQ) {
209 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
210 return;
211 }
212
213 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
214 if (rc) {
215 printk(KERN_ERR __FILE__
216 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
217 return;
218 }
219}
220
221static inline void pika_dtm_check_fan(void __iomem *fpga)
222{
223 static int fan_state;
224 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
225
226 if (fan_state != fan) {
227 fan_state = fan;
228 if (fan)
229 printk(KERN_WARNING "Fan rotation error detected."
230 " Please check hardware.\n");
231 }
232}
233
234static int pika_dtm_thread(void __iomem *fpga)
235{
236 struct device_node *np;
237 struct i2c_client *client;
238
239 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
240 if (np == NULL)
241 return -ENOENT;
242
243 client = of_find_i2c_device_by_node(np);
244 if (client == NULL) {
245 of_node_put(np);
246 return -ENOENT;
247 }
248
249 pika_setup_critical_temp(np, client);
250
251 of_node_put(np);
252
253 printk(KERN_INFO "Warp DTM thread running.\n");
254
255 while (!kthread_should_stop()) {
256 int val;
257
258 val = i2c_smbus_read_word_data(client, 0);
259 if (val < 0)
260 dev_dbg(&client->dev, "DTM read temp failed.\n");
261 else {
262 s16 temp = swab16(val);
263 out_be32(fpga + 0x20, temp);
264 }
265
266 pika_dtm_check_fan(fpga);
267
268 set_current_state(TASK_INTERRUPTIBLE);
269 schedule_timeout(HZ);
270 }
271
272 return 0;
273}
274
275static int __init pika_dtm_start(void)
276{
277 struct task_struct *dtm_thread;
278 struct device_node *np;
279
280 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
281 if (np == NULL)
282 return -ENOENT;
283
284 dtm_fpga = of_iomap(np, 0);
285 of_node_put(np);
286 if (dtm_fpga == NULL)
287 return -ENOENT;
288
289
290 warp_post_info();
291
292 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
293 if (IS_ERR(dtm_thread)) {
294 iounmap(dtm_fpga);
295 return PTR_ERR(dtm_thread);
296 }
297
298 return 0;
299}
300machine_late_initcall(warp, pika_dtm_start);
301
302#else
303
304int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
305{
306 return 0;
307}
308
309int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
310{
311 return 0;
312}
313
314machine_late_initcall(warp, warp_post_info);
315
316#endif
317
318EXPORT_SYMBOL(pika_dtm_register_shutdown);
319EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
320
