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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/slab.h>
20#include <linux/export.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#include <asm/dma.h>
29
30
31static const struct of_device_id warp_of_bus[] __initconst = {
32 { .compatible = "ibm,plb4", },
33 { .compatible = "ibm,opb", },
34 { .compatible = "ibm,ebc", },
35 {},
36};
37
38static int __init warp_device_probe(void)
39{
40 of_platform_bus_probe(NULL, warp_of_bus, NULL);
41 return 0;
42}
43machine_device_initcall(warp, warp_device_probe);
44
45static int __init warp_probe(void)
46{
47 unsigned long root = of_get_flat_dt_root();
48
49 if (!of_flat_dt_is_compatible(root, "pika,warp"))
50 return 0;
51
52
53 ISA_DMA_THRESHOLD = ~0L;
54
55 return 1;
56}
57
58define_machine(warp) {
59 .name = "Warp",
60 .probe = warp_probe,
61 .progress = udbg_progress,
62 .init_IRQ = uic_init_tree,
63 .get_irq = uic_get_irq,
64 .restart = ppc4xx_reset_system,
65 .calibrate_decr = generic_calibrate_decr,
66};
67
68
69static int __init warp_post_info(void)
70{
71 struct device_node *np;
72 void __iomem *fpga;
73 u32 post1, post2;
74
75
76 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
77 if (np == NULL)
78 return -ENOENT;
79
80 fpga = of_iomap(np, 0);
81 of_node_put(np);
82 if (fpga == NULL)
83 return -ENOENT;
84
85 post1 = in_be32(fpga + 0x40);
86 post2 = in_be32(fpga + 0x44);
87
88 iounmap(fpga);
89
90 if (post1 || post2)
91 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
92 else
93 printk(KERN_INFO "Warp POST OK\n");
94
95 return 0;
96}
97
98
99#ifdef CONFIG_SENSORS_AD7414
100
101static LIST_HEAD(dtm_shutdown_list);
102static void __iomem *dtm_fpga;
103static unsigned green_led, red_led;
104
105
106struct dtm_shutdown {
107 struct list_head list;
108 void (*func)(void *arg);
109 void *arg;
110};
111
112
113int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
114{
115 struct dtm_shutdown *shutdown;
116
117 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
118 if (shutdown == NULL)
119 return -ENOMEM;
120
121 shutdown->func = func;
122 shutdown->arg = arg;
123
124 list_add(&shutdown->list, &dtm_shutdown_list);
125
126 return 0;
127}
128
129int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
130{
131 struct dtm_shutdown *shutdown;
132
133 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
134 if (shutdown->func == func && shutdown->arg == arg) {
135 list_del(&shutdown->list);
136 kfree(shutdown);
137 return 0;
138 }
139
140 return -EINVAL;
141}
142
143static irqreturn_t temp_isr(int irq, void *context)
144{
145 struct dtm_shutdown *shutdown;
146 int value = 1;
147
148 local_irq_disable();
149
150 gpio_set_value(green_led, 0);
151
152
153 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
154 shutdown->func(shutdown->arg);
155
156 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
157
158 while (1) {
159 if (dtm_fpga) {
160 unsigned reset = in_be32(dtm_fpga + 0x14);
161 out_be32(dtm_fpga + 0x14, reset);
162 }
163
164 gpio_set_value(red_led, value);
165 value ^= 1;
166 mdelay(500);
167 }
168
169
170 return IRQ_HANDLED;
171}
172
173static int pika_setup_leds(void)
174{
175 struct device_node *np, *child;
176
177 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
178 if (!np) {
179 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
180 return -ENOENT;
181 }
182
183 for_each_child_of_node(np, child)
184 if (strcmp(child->name, "green") == 0)
185 green_led = of_get_gpio(child, 0);
186 else if (strcmp(child->name, "red") == 0)
187 red_led = of_get_gpio(child, 0);
188
189 of_node_put(np);
190
191 return 0;
192}
193
194static void pika_setup_critical_temp(struct device_node *np,
195 struct i2c_client *client)
196{
197 int irq, rc;
198
199
200
201
202 pika_setup_leds();
203
204
205 i2c_smbus_write_byte_data(client, 2, 65);
206 i2c_smbus_write_byte_data(client, 3, 0);
207
208 irq = irq_of_parse_and_map(np, 0);
209 if (irq == NO_IRQ) {
210 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
211 return;
212 }
213
214 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
215 if (rc) {
216 printk(KERN_ERR __FILE__
217 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
218 return;
219 }
220}
221
222static inline void pika_dtm_check_fan(void __iomem *fpga)
223{
224 static int fan_state;
225 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
226
227 if (fan_state != fan) {
228 fan_state = fan;
229 if (fan)
230 printk(KERN_WARNING "Fan rotation error detected."
231 " Please check hardware.\n");
232 }
233}
234
235static int pika_dtm_thread(void __iomem *fpga)
236{
237 struct device_node *np;
238 struct i2c_client *client;
239
240 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
241 if (np == NULL)
242 return -ENOENT;
243
244 client = of_find_i2c_device_by_node(np);
245 if (client == NULL) {
246 of_node_put(np);
247 return -ENOENT;
248 }
249
250 pika_setup_critical_temp(np, client);
251
252 of_node_put(np);
253
254 printk(KERN_INFO "Warp DTM thread running.\n");
255
256 while (!kthread_should_stop()) {
257 int val;
258
259 val = i2c_smbus_read_word_data(client, 0);
260 if (val < 0)
261 dev_dbg(&client->dev, "DTM read temp failed.\n");
262 else {
263 s16 temp = swab16(val);
264 out_be32(fpga + 0x20, temp);
265 }
266
267 pika_dtm_check_fan(fpga);
268
269 set_current_state(TASK_INTERRUPTIBLE);
270 schedule_timeout(HZ);
271 }
272
273 return 0;
274}
275
276static int __init pika_dtm_start(void)
277{
278 struct task_struct *dtm_thread;
279 struct device_node *np;
280
281 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
282 if (np == NULL)
283 return -ENOENT;
284
285 dtm_fpga = of_iomap(np, 0);
286 of_node_put(np);
287 if (dtm_fpga == NULL)
288 return -ENOENT;
289
290
291 warp_post_info();
292
293 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
294 if (IS_ERR(dtm_thread)) {
295 iounmap(dtm_fpga);
296 return PTR_ERR(dtm_thread);
297 }
298
299 return 0;
300}
301machine_late_initcall(warp, pika_dtm_start);
302
303#else
304
305int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
306{
307 return 0;
308}
309
310int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
311{
312 return 0;
313}
314
315machine_late_initcall(warp, warp_post_info);
316
317#endif
318
319EXPORT_SYMBOL(pika_dtm_register_shutdown);
320EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
321
