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