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f9bdedb2 SM |
1 | /* |
2 | * PIKA Warp(tm) board specific routines | |
3 | * | |
805e324b | 4 | * Copyright (c) 2008-2009 PIKA Technologies |
f9bdedb2 SM |
5 | * Sean MacLennan <smaclennan@pikatech.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | #include <linux/init.h> | |
13 | #include <linux/of_platform.h> | |
14 | #include <linux/kthread.h> | |
4ebef31f SM |
15 | #include <linux/i2c.h> |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/delay.h> | |
805e324b | 18 | #include <linux/of_gpio.h> |
3984114f | 19 | #include <linux/of_i2c.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f9bdedb2 SM |
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> | |
93173ce2 | 27 | #include <asm/ppc4xx.h> |
f9bdedb2 | 28 | |
805e324b | 29 | |
f9bdedb2 SM |
30 | static __initdata struct of_device_id warp_of_bus[] = { |
31 | { .compatible = "ibm,plb4", }, | |
32 | { .compatible = "ibm,opb", }, | |
33 | { .compatible = "ibm,ebc", }, | |
34 | {}, | |
35 | }; | |
36 | ||
37 | static int __init warp_device_probe(void) | |
38 | { | |
39 | of_platform_bus_probe(NULL, warp_of_bus, NULL); | |
40 | return 0; | |
41 | } | |
42 | machine_device_initcall(warp, warp_device_probe); | |
43 | ||
44 | static int __init warp_probe(void) | |
45 | { | |
46 | unsigned long root = of_get_flat_dt_root(); | |
47 | ||
79290e4b SM |
48 | if (!of_flat_dt_is_compatible(root, "pika,warp")) |
49 | return 0; | |
50 | ||
51 | /* For __dma_alloc_coherent */ | |
52 | ISA_DMA_THRESHOLD = ~0L; | |
53 | ||
54 | return 1; | |
f9bdedb2 SM |
55 | } |
56 | ||
57 | define_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, | |
93173ce2 | 63 | .restart = ppc4xx_reset_system, |
f9bdedb2 SM |
64 | .calibrate_decr = generic_calibrate_decr, |
65 | }; | |
66 | ||
67 | ||
4ebef31f SM |
68 | static int __init warp_post_info(void) |
69 | { | |
70 | struct device_node *np; | |
71 | void __iomem *fpga; | |
72 | u32 post1, post2; | |
73 | ||
74 | /* Sighhhh... POST information is in the sd area. */ | |
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 | ||
ba703e1a | 89 | if (post1 || post2) |
4ebef31f | 90 | printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2); |
ba703e1a | 91 | else |
4ebef31f SM |
92 | printk(KERN_INFO "Warp POST OK\n"); |
93 | ||
94 | return 0; | |
95 | } | |
4ebef31f SM |
96 | |
97 | ||
98 | #ifdef CONFIG_SENSORS_AD7414 | |
99 | ||
100 | static LIST_HEAD(dtm_shutdown_list); | |
101 | static void __iomem *dtm_fpga; | |
805e324b | 102 | static unsigned green_led, red_led; |
4ebef31f SM |
103 | |
104 | ||
105 | struct dtm_shutdown { | |
106 | struct list_head list; | |
107 | void (*func)(void *arg); | |
108 | void *arg; | |
109 | }; | |
f9bdedb2 SM |
110 | |
111 | ||
4ebef31f | 112 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) |
f9bdedb2 | 113 | { |
4ebef31f SM |
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 | ||
128 | int 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 | ||
142 | static irqreturn_t temp_isr(int irq, void *context) | |
143 | { | |
144 | struct dtm_shutdown *shutdown; | |
805e324b | 145 | int value = 1; |
4ebef31f SM |
146 | |
147 | local_irq_disable(); | |
148 | ||
805e324b SM |
149 | gpio_set_value(green_led, 0); |
150 | ||
4ebef31f SM |
151 | /* Run through the shutdown list. */ |
152 | list_for_each_entry(shutdown, &dtm_shutdown_list, list) | |
153 | shutdown->func(shutdown->arg); | |
154 | ||
805e324b | 155 | printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n"); |
4ebef31f SM |
156 | |
157 | while (1) { | |
158 | if (dtm_fpga) { | |
159 | unsigned reset = in_be32(dtm_fpga + 0x14); | |
160 | out_be32(dtm_fpga + 0x14, reset); | |
f9bdedb2 SM |
161 | } |
162 | ||
805e324b SM |
163 | gpio_set_value(red_led, value); |
164 | value ^= 1; | |
4ebef31f SM |
165 | mdelay(500); |
166 | } | |
a22ebd06 JB |
167 | |
168 | /* Not reached */ | |
169 | return IRQ_HANDLED; | |
4ebef31f SM |
170 | } |
171 | ||
172 | static int pika_setup_leds(void) | |
173 | { | |
805e324b | 174 | struct device_node *np, *child; |
4ebef31f | 175 | |
805e324b | 176 | np = of_find_compatible_node(NULL, NULL, "gpio-leds"); |
4ebef31f | 177 | if (!np) { |
805e324b | 178 | printk(KERN_ERR __FILE__ ": Unable to find leds\n"); |
4ebef31f SM |
179 | return -ENOENT; |
180 | } | |
f9bdedb2 | 181 | |
805e324b | 182 | for_each_child_of_node(np, child) |
ba703e1a | 183 | if (strcmp(child->name, "green") == 0) |
805e324b | 184 | green_led = of_get_gpio(child, 0); |
ba703e1a | 185 | else if (strcmp(child->name, "red") == 0) |
805e324b | 186 | red_led = of_get_gpio(child, 0); |
4ebef31f | 187 | |
4ebef31f | 188 | of_node_put(np); |
f9bdedb2 | 189 | |
4ebef31f | 190 | return 0; |
f9bdedb2 | 191 | } |
f9bdedb2 | 192 | |
3984114f SM |
193 | static void pika_setup_critical_temp(struct device_node *np, |
194 | struct i2c_client *client) | |
4ebef31f | 195 | { |
4ebef31f SM |
196 | int irq, rc; |
197 | ||
198 | /* Do this before enabling critical temp interrupt since we | |
199 | * may immediately interrupt. | |
200 | */ | |
201 | pika_setup_leds(); | |
202 | ||
203 | /* These registers are in 1 degree increments. */ | |
204 | i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */ | |
048040a3 | 205 | i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */ |
4ebef31f | 206 | |
4ebef31f | 207 | irq = irq_of_parse_and_map(np, 0); |
4ebef31f SM |
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 | ||
221 | static 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 | } | |
f9bdedb2 | 233 | |
f9bdedb2 SM |
234 | static int pika_dtm_thread(void __iomem *fpga) |
235 | { | |
3984114f | 236 | struct device_node *np; |
4ebef31f SM |
237 | struct i2c_client *client; |
238 | ||
3984114f SM |
239 | np = of_find_compatible_node(NULL, NULL, "adi,ad7414"); |
240 | if (np == NULL) | |
241 | return -ENOENT; | |
4ebef31f | 242 | |
3984114f SM |
243 | client = of_find_i2c_device_by_node(np); |
244 | if (client == NULL) { | |
245 | of_node_put(np); | |
246 | return -ENOENT; | |
4ebef31f SM |
247 | } |
248 | ||
3984114f | 249 | pika_setup_critical_temp(np, client); |
4ebef31f | 250 | |
3984114f | 251 | of_node_put(np); |
805e324b | 252 | |
3984114f | 253 | printk(KERN_INFO "Warp DTM thread running.\n"); |
f9bdedb2 SM |
254 | |
255 | while (!kthread_should_stop()) { | |
048040a3 SM |
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 | } | |
f9bdedb2 | 265 | |
4ebef31f | 266 | pika_dtm_check_fan(fpga); |
f9bdedb2 SM |
267 | |
268 | set_current_state(TASK_INTERRUPTIBLE); | |
269 | schedule_timeout(HZ); | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static int __init pika_dtm_start(void) | |
276 | { | |
277 | struct task_struct *dtm_thread; | |
278 | struct device_node *np; | |
f9bdedb2 SM |
279 | |
280 | np = of_find_compatible_node(NULL, NULL, "pika,fpga"); | |
281 | if (np == NULL) | |
282 | return -ENOENT; | |
283 | ||
4ebef31f | 284 | dtm_fpga = of_iomap(np, 0); |
f9bdedb2 | 285 | of_node_put(np); |
4ebef31f | 286 | if (dtm_fpga == NULL) |
f9bdedb2 SM |
287 | return -ENOENT; |
288 | ||
805e324b SM |
289 | /* Must get post info before thread starts. */ |
290 | warp_post_info(); | |
291 | ||
4ebef31f | 292 | dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm"); |
f9bdedb2 | 293 | if (IS_ERR(dtm_thread)) { |
4ebef31f | 294 | iounmap(dtm_fpga); |
f9bdedb2 SM |
295 | return PTR_ERR(dtm_thread); |
296 | } | |
297 | ||
298 | return 0; | |
299 | } | |
4ebef31f SM |
300 | machine_late_initcall(warp, pika_dtm_start); |
301 | ||
302 | #else /* !CONFIG_SENSORS_AD7414 */ | |
303 | ||
304 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) | |
305 | { | |
306 | return 0; | |
307 | } | |
308 | ||
309 | int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg) | |
310 | { | |
311 | return 0; | |
312 | } | |
313 | ||
805e324b SM |
314 | machine_late_initcall(warp, warp_post_info); |
315 | ||
f9bdedb2 | 316 | #endif |
4ebef31f SM |
317 | |
318 | EXPORT_SYMBOL(pika_dtm_register_shutdown); | |
319 | EXPORT_SYMBOL(pika_dtm_unregister_shutdown); |