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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> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
93087948 | 20 | #include <linux/export.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> |
308c09f1 | 28 | #include <asm/dma.h> |
f9bdedb2 | 29 | |
805e324b | 30 | |
ce6d73c9 | 31 | static const struct of_device_id warp_of_bus[] __initconst = { |
f9bdedb2 SM |
32 | { .compatible = "ibm,plb4", }, |
33 | { .compatible = "ibm,opb", }, | |
34 | { .compatible = "ibm,ebc", }, | |
35 | {}, | |
36 | }; | |
37 | ||
38 | static int __init warp_device_probe(void) | |
39 | { | |
40 | of_platform_bus_probe(NULL, warp_of_bus, NULL); | |
41 | return 0; | |
42 | } | |
43 | machine_device_initcall(warp, warp_device_probe); | |
44 | ||
45 | static int __init warp_probe(void) | |
46 | { | |
56571384 | 47 | if (!of_machine_is_compatible("pika,warp")) |
79290e4b SM |
48 | return 0; |
49 | ||
50 | /* For __dma_alloc_coherent */ | |
51 | ISA_DMA_THRESHOLD = ~0L; | |
52 | ||
53 | return 1; | |
f9bdedb2 SM |
54 | } |
55 | ||
56 | define_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, | |
93173ce2 | 62 | .restart = ppc4xx_reset_system, |
f9bdedb2 SM |
63 | .calibrate_decr = generic_calibrate_decr, |
64 | }; | |
65 | ||
66 | ||
4ebef31f SM |
67 | static int __init warp_post_info(void) |
68 | { | |
69 | struct device_node *np; | |
70 | void __iomem *fpga; | |
71 | u32 post1, post2; | |
72 | ||
73 | /* Sighhhh... POST information is in the sd area. */ | |
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 | ||
ba703e1a | 88 | if (post1 || post2) |
4ebef31f | 89 | printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2); |
ba703e1a | 90 | else |
4ebef31f SM |
91 | printk(KERN_INFO "Warp POST OK\n"); |
92 | ||
93 | return 0; | |
94 | } | |
4ebef31f SM |
95 | |
96 | ||
97 | #ifdef CONFIG_SENSORS_AD7414 | |
98 | ||
99 | static LIST_HEAD(dtm_shutdown_list); | |
100 | static void __iomem *dtm_fpga; | |
805e324b | 101 | static unsigned green_led, red_led; |
4ebef31f SM |
102 | |
103 | ||
104 | struct dtm_shutdown { | |
105 | struct list_head list; | |
106 | void (*func)(void *arg); | |
107 | void *arg; | |
108 | }; | |
f9bdedb2 SM |
109 | |
110 | ||
4ebef31f | 111 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) |
f9bdedb2 | 112 | { |
4ebef31f SM |
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 | ||
127 | int 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 | ||
141 | static irqreturn_t temp_isr(int irq, void *context) | |
142 | { | |
143 | struct dtm_shutdown *shutdown; | |
805e324b | 144 | int value = 1; |
4ebef31f SM |
145 | |
146 | local_irq_disable(); | |
147 | ||
805e324b SM |
148 | gpio_set_value(green_led, 0); |
149 | ||
4ebef31f SM |
150 | /* Run through the shutdown list. */ |
151 | list_for_each_entry(shutdown, &dtm_shutdown_list, list) | |
152 | shutdown->func(shutdown->arg); | |
153 | ||
805e324b | 154 | printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n"); |
4ebef31f SM |
155 | |
156 | while (1) { | |
157 | if (dtm_fpga) { | |
158 | unsigned reset = in_be32(dtm_fpga + 0x14); | |
159 | out_be32(dtm_fpga + 0x14, reset); | |
f9bdedb2 SM |
160 | } |
161 | ||
805e324b SM |
162 | gpio_set_value(red_led, value); |
163 | value ^= 1; | |
4ebef31f SM |
164 | mdelay(500); |
165 | } | |
a22ebd06 JB |
166 | |
167 | /* Not reached */ | |
168 | return IRQ_HANDLED; | |
4ebef31f SM |
169 | } |
170 | ||
171 | static int pika_setup_leds(void) | |
172 | { | |
805e324b | 173 | struct device_node *np, *child; |
4ebef31f | 174 | |
805e324b | 175 | np = of_find_compatible_node(NULL, NULL, "gpio-leds"); |
4ebef31f | 176 | if (!np) { |
805e324b | 177 | printk(KERN_ERR __FILE__ ": Unable to find leds\n"); |
4ebef31f SM |
178 | return -ENOENT; |
179 | } | |
f9bdedb2 | 180 | |
805e324b | 181 | for_each_child_of_node(np, child) |
ba703e1a | 182 | if (strcmp(child->name, "green") == 0) |
805e324b | 183 | green_led = of_get_gpio(child, 0); |
ba703e1a | 184 | else if (strcmp(child->name, "red") == 0) |
805e324b | 185 | red_led = of_get_gpio(child, 0); |
4ebef31f | 186 | |
4ebef31f | 187 | of_node_put(np); |
f9bdedb2 | 188 | |
4ebef31f | 189 | return 0; |
f9bdedb2 | 190 | } |
f9bdedb2 | 191 | |
3984114f SM |
192 | static void pika_setup_critical_temp(struct device_node *np, |
193 | struct i2c_client *client) | |
4ebef31f | 194 | { |
4ebef31f SM |
195 | int irq, rc; |
196 | ||
197 | /* Do this before enabling critical temp interrupt since we | |
198 | * may immediately interrupt. | |
199 | */ | |
200 | pika_setup_leds(); | |
201 | ||
202 | /* These registers are in 1 degree increments. */ | |
203 | i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */ | |
048040a3 | 204 | i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */ |
4ebef31f | 205 | |
4ebef31f | 206 | irq = irq_of_parse_and_map(np, 0); |
ef24ba70 | 207 | if (!irq) { |
4ebef31f SM |
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 | ||
220 | static 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 | } | |
f9bdedb2 | 232 | |
f9bdedb2 SM |
233 | static int pika_dtm_thread(void __iomem *fpga) |
234 | { | |
3984114f | 235 | struct device_node *np; |
4ebef31f SM |
236 | struct i2c_client *client; |
237 | ||
3984114f SM |
238 | np = of_find_compatible_node(NULL, NULL, "adi,ad7414"); |
239 | if (np == NULL) | |
240 | return -ENOENT; | |
4ebef31f | 241 | |
3984114f SM |
242 | client = of_find_i2c_device_by_node(np); |
243 | if (client == NULL) { | |
244 | of_node_put(np); | |
245 | return -ENOENT; | |
4ebef31f SM |
246 | } |
247 | ||
3984114f | 248 | pika_setup_critical_temp(np, client); |
4ebef31f | 249 | |
3984114f | 250 | of_node_put(np); |
805e324b | 251 | |
3984114f | 252 | printk(KERN_INFO "Warp DTM thread running.\n"); |
f9bdedb2 SM |
253 | |
254 | while (!kthread_should_stop()) { | |
048040a3 SM |
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 | } | |
f9bdedb2 | 264 | |
4ebef31f | 265 | pika_dtm_check_fan(fpga); |
f9bdedb2 SM |
266 | |
267 | set_current_state(TASK_INTERRUPTIBLE); | |
268 | schedule_timeout(HZ); | |
269 | } | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int __init pika_dtm_start(void) | |
275 | { | |
276 | struct task_struct *dtm_thread; | |
277 | struct device_node *np; | |
f9bdedb2 SM |
278 | |
279 | np = of_find_compatible_node(NULL, NULL, "pika,fpga"); | |
280 | if (np == NULL) | |
281 | return -ENOENT; | |
282 | ||
4ebef31f | 283 | dtm_fpga = of_iomap(np, 0); |
f9bdedb2 | 284 | of_node_put(np); |
4ebef31f | 285 | if (dtm_fpga == NULL) |
f9bdedb2 SM |
286 | return -ENOENT; |
287 | ||
805e324b SM |
288 | /* Must get post info before thread starts. */ |
289 | warp_post_info(); | |
290 | ||
4ebef31f | 291 | dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm"); |
f9bdedb2 | 292 | if (IS_ERR(dtm_thread)) { |
4ebef31f | 293 | iounmap(dtm_fpga); |
f9bdedb2 SM |
294 | return PTR_ERR(dtm_thread); |
295 | } | |
296 | ||
297 | return 0; | |
298 | } | |
4ebef31f SM |
299 | machine_late_initcall(warp, pika_dtm_start); |
300 | ||
301 | #else /* !CONFIG_SENSORS_AD7414 */ | |
302 | ||
303 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) | |
304 | { | |
305 | return 0; | |
306 | } | |
307 | ||
308 | int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg) | |
309 | { | |
310 | return 0; | |
311 | } | |
312 | ||
805e324b SM |
313 | machine_late_initcall(warp, warp_post_info); |
314 | ||
f9bdedb2 | 315 | #endif |
4ebef31f SM |
316 | |
317 | EXPORT_SYMBOL(pika_dtm_register_shutdown); | |
318 | EXPORT_SYMBOL(pika_dtm_unregister_shutdown); |