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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 | { | |
47 | unsigned long root = of_get_flat_dt_root(); | |
48 | ||
79290e4b SM |
49 | if (!of_flat_dt_is_compatible(root, "pika,warp")) |
50 | return 0; | |
51 | ||
52 | /* For __dma_alloc_coherent */ | |
53 | ISA_DMA_THRESHOLD = ~0L; | |
54 | ||
55 | return 1; | |
f9bdedb2 SM |
56 | } |
57 | ||
58 | define_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, | |
93173ce2 | 64 | .restart = ppc4xx_reset_system, |
f9bdedb2 SM |
65 | .calibrate_decr = generic_calibrate_decr, |
66 | }; | |
67 | ||
68 | ||
4ebef31f SM |
69 | static int __init warp_post_info(void) |
70 | { | |
71 | struct device_node *np; | |
72 | void __iomem *fpga; | |
73 | u32 post1, post2; | |
74 | ||
75 | /* Sighhhh... POST information is in the sd area. */ | |
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 | ||
ba703e1a | 90 | if (post1 || post2) |
4ebef31f | 91 | printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2); |
ba703e1a | 92 | else |
4ebef31f SM |
93 | printk(KERN_INFO "Warp POST OK\n"); |
94 | ||
95 | return 0; | |
96 | } | |
4ebef31f SM |
97 | |
98 | ||
99 | #ifdef CONFIG_SENSORS_AD7414 | |
100 | ||
101 | static LIST_HEAD(dtm_shutdown_list); | |
102 | static void __iomem *dtm_fpga; | |
805e324b | 103 | static unsigned green_led, red_led; |
4ebef31f SM |
104 | |
105 | ||
106 | struct dtm_shutdown { | |
107 | struct list_head list; | |
108 | void (*func)(void *arg); | |
109 | void *arg; | |
110 | }; | |
f9bdedb2 SM |
111 | |
112 | ||
4ebef31f | 113 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) |
f9bdedb2 | 114 | { |
4ebef31f SM |
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 | ||
129 | int 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 | ||
143 | static irqreturn_t temp_isr(int irq, void *context) | |
144 | { | |
145 | struct dtm_shutdown *shutdown; | |
805e324b | 146 | int value = 1; |
4ebef31f SM |
147 | |
148 | local_irq_disable(); | |
149 | ||
805e324b SM |
150 | gpio_set_value(green_led, 0); |
151 | ||
4ebef31f SM |
152 | /* Run through the shutdown list. */ |
153 | list_for_each_entry(shutdown, &dtm_shutdown_list, list) | |
154 | shutdown->func(shutdown->arg); | |
155 | ||
805e324b | 156 | printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n"); |
4ebef31f SM |
157 | |
158 | while (1) { | |
159 | if (dtm_fpga) { | |
160 | unsigned reset = in_be32(dtm_fpga + 0x14); | |
161 | out_be32(dtm_fpga + 0x14, reset); | |
f9bdedb2 SM |
162 | } |
163 | ||
805e324b SM |
164 | gpio_set_value(red_led, value); |
165 | value ^= 1; | |
4ebef31f SM |
166 | mdelay(500); |
167 | } | |
a22ebd06 JB |
168 | |
169 | /* Not reached */ | |
170 | return IRQ_HANDLED; | |
4ebef31f SM |
171 | } |
172 | ||
173 | static int pika_setup_leds(void) | |
174 | { | |
805e324b | 175 | struct device_node *np, *child; |
4ebef31f | 176 | |
805e324b | 177 | np = of_find_compatible_node(NULL, NULL, "gpio-leds"); |
4ebef31f | 178 | if (!np) { |
805e324b | 179 | printk(KERN_ERR __FILE__ ": Unable to find leds\n"); |
4ebef31f SM |
180 | return -ENOENT; |
181 | } | |
f9bdedb2 | 182 | |
805e324b | 183 | for_each_child_of_node(np, child) |
ba703e1a | 184 | if (strcmp(child->name, "green") == 0) |
805e324b | 185 | green_led = of_get_gpio(child, 0); |
ba703e1a | 186 | else if (strcmp(child->name, "red") == 0) |
805e324b | 187 | red_led = of_get_gpio(child, 0); |
4ebef31f | 188 | |
4ebef31f | 189 | of_node_put(np); |
f9bdedb2 | 190 | |
4ebef31f | 191 | return 0; |
f9bdedb2 | 192 | } |
f9bdedb2 | 193 | |
3984114f SM |
194 | static void pika_setup_critical_temp(struct device_node *np, |
195 | struct i2c_client *client) | |
4ebef31f | 196 | { |
4ebef31f SM |
197 | int irq, rc; |
198 | ||
199 | /* Do this before enabling critical temp interrupt since we | |
200 | * may immediately interrupt. | |
201 | */ | |
202 | pika_setup_leds(); | |
203 | ||
204 | /* These registers are in 1 degree increments. */ | |
205 | i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */ | |
048040a3 | 206 | i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */ |
4ebef31f | 207 | |
4ebef31f | 208 | irq = irq_of_parse_and_map(np, 0); |
4ebef31f SM |
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 | ||
222 | static 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 | } | |
f9bdedb2 | 234 | |
f9bdedb2 SM |
235 | static int pika_dtm_thread(void __iomem *fpga) |
236 | { | |
3984114f | 237 | struct device_node *np; |
4ebef31f SM |
238 | struct i2c_client *client; |
239 | ||
3984114f SM |
240 | np = of_find_compatible_node(NULL, NULL, "adi,ad7414"); |
241 | if (np == NULL) | |
242 | return -ENOENT; | |
4ebef31f | 243 | |
3984114f SM |
244 | client = of_find_i2c_device_by_node(np); |
245 | if (client == NULL) { | |
246 | of_node_put(np); | |
247 | return -ENOENT; | |
4ebef31f SM |
248 | } |
249 | ||
3984114f | 250 | pika_setup_critical_temp(np, client); |
4ebef31f | 251 | |
3984114f | 252 | of_node_put(np); |
805e324b | 253 | |
3984114f | 254 | printk(KERN_INFO "Warp DTM thread running.\n"); |
f9bdedb2 SM |
255 | |
256 | while (!kthread_should_stop()) { | |
048040a3 SM |
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 | } | |
f9bdedb2 | 266 | |
4ebef31f | 267 | pika_dtm_check_fan(fpga); |
f9bdedb2 SM |
268 | |
269 | set_current_state(TASK_INTERRUPTIBLE); | |
270 | schedule_timeout(HZ); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int __init pika_dtm_start(void) | |
277 | { | |
278 | struct task_struct *dtm_thread; | |
279 | struct device_node *np; | |
f9bdedb2 SM |
280 | |
281 | np = of_find_compatible_node(NULL, NULL, "pika,fpga"); | |
282 | if (np == NULL) | |
283 | return -ENOENT; | |
284 | ||
4ebef31f | 285 | dtm_fpga = of_iomap(np, 0); |
f9bdedb2 | 286 | of_node_put(np); |
4ebef31f | 287 | if (dtm_fpga == NULL) |
f9bdedb2 SM |
288 | return -ENOENT; |
289 | ||
805e324b SM |
290 | /* Must get post info before thread starts. */ |
291 | warp_post_info(); | |
292 | ||
4ebef31f | 293 | dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm"); |
f9bdedb2 | 294 | if (IS_ERR(dtm_thread)) { |
4ebef31f | 295 | iounmap(dtm_fpga); |
f9bdedb2 SM |
296 | return PTR_ERR(dtm_thread); |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
4ebef31f SM |
301 | machine_late_initcall(warp, pika_dtm_start); |
302 | ||
303 | #else /* !CONFIG_SENSORS_AD7414 */ | |
304 | ||
305 | int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg) | |
306 | { | |
307 | return 0; | |
308 | } | |
309 | ||
310 | int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg) | |
311 | { | |
312 | return 0; | |
313 | } | |
314 | ||
805e324b SM |
315 | machine_late_initcall(warp, warp_post_info); |
316 | ||
f9bdedb2 | 317 | #endif |
4ebef31f SM |
318 | |
319 | EXPORT_SYMBOL(pika_dtm_register_shutdown); | |
320 | EXPORT_SYMBOL(pika_dtm_unregister_shutdown); |