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Sean MacLennanf9bdedb2008-01-22 04:55:29 +11001/*
2 * PIKA Warp(tm) board specific routines
3 *
Sean MacLennan805e3242009-04-06 11:58:25 +00004 * Copyright (c) 2008-2009 PIKA Technologies
Sean MacLennanf9bdedb2008-01-22 04:55:29 +11005 * 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>
Sean MacLennan4ebef312008-05-20 08:28:52 -050015#include <linux/i2c.h>
16#include <linux/interrupt.h>
17#include <linux/delay.h>
Sean MacLennan805e3242009-04-06 11:58:25 +000018#include <linux/of_gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Paul Gortmaker93087942011-07-29 16:19:31 +100020#include <linux/export.h>
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110021
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>
Stefan Roese93173ce2008-03-28 01:43:31 +110027#include <asm/ppc4xx.h>
Laura Abbott308c09f2014-08-08 14:23:25 -070028#include <asm/dma.h>
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110029
Sean MacLennan805e3242009-04-06 11:58:25 +000030
Uwe Kleine-Königce6d73c2014-09-10 21:56:38 +020031static const struct of_device_id warp_of_bus[] __initconst = {
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110032 { .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
Sean MacLennan79290e42009-06-10 15:09:23 +000049 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;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110056}
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,
Stefan Roese93173ce2008-03-28 01:43:31 +110064 .restart = ppc4xx_reset_system,
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110065 .calibrate_decr = generic_calibrate_decr,
66};
67
68
Sean MacLennan4ebef312008-05-20 08:28:52 -050069static int __init warp_post_info(void)
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110070{
Sean MacLennan4ebef312008-05-20 08:28:52 -050071 struct device_node *np;
72 void __iomem *fpga;
73 u32 post1, post2;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110074
Sean MacLennan4ebef312008-05-20 08:28:52 -050075 /* 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;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110079
Sean MacLennan4ebef312008-05-20 08:28:52 -050080 fpga = of_iomap(np, 0);
81 of_node_put(np);
82 if (fpga == NULL)
83 return -ENOENT;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110084
Sean MacLennan4ebef312008-05-20 08:28:52 -050085 post1 = in_be32(fpga + 0x40);
86 post2 = in_be32(fpga + 0x44);
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110087
Sean MacLennan4ebef312008-05-20 08:28:52 -050088 iounmap(fpga);
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110089
Sean MacLennanba703e12009-06-28 11:22:51 +000090 if (post1 || post2)
Sean MacLennan4ebef312008-05-20 08:28:52 -050091 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
Sean MacLennanba703e12009-06-28 11:22:51 +000092 else
Sean MacLennan4ebef312008-05-20 08:28:52 -050093 printk(KERN_INFO "Warp POST OK\n");
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110094
Sean MacLennan4ebef312008-05-20 08:28:52 -050095 return 0;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110096}
Sean MacLennanf9bdedb2008-01-22 04:55:29 +110097
98
99#ifdef CONFIG_SENSORS_AD7414
Sean MacLennan4ebef312008-05-20 08:28:52 -0500100
101static LIST_HEAD(dtm_shutdown_list);
102static void __iomem *dtm_fpga;
Sean MacLennan805e3242009-04-06 11:58:25 +0000103static unsigned green_led, red_led;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500104
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;
Sean MacLennan805e3242009-04-06 11:58:25 +0000146 int value = 1;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500147
148 local_irq_disable();
149
Sean MacLennan805e3242009-04-06 11:58:25 +0000150 gpio_set_value(green_led, 0);
151
Sean MacLennan4ebef312008-05-20 08:28:52 -0500152 /* Run through the shutdown list. */
153 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
154 shutdown->func(shutdown->arg);
155
Sean MacLennan805e3242009-04-06 11:58:25 +0000156 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
Sean MacLennan4ebef312008-05-20 08:28:52 -0500157
158 while (1) {
159 if (dtm_fpga) {
160 unsigned reset = in_be32(dtm_fpga + 0x14);
161 out_be32(dtm_fpga + 0x14, reset);
162 }
163
Sean MacLennan805e3242009-04-06 11:58:25 +0000164 gpio_set_value(red_led, value);
165 value ^= 1;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500166 mdelay(500);
167 }
Josh Boyera22ebd02009-07-05 10:02:15 -0400168
169 /* Not reached */
170 return IRQ_HANDLED;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500171}
172
173static int pika_setup_leds(void)
174{
Sean MacLennan805e3242009-04-06 11:58:25 +0000175 struct device_node *np, *child;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500176
Sean MacLennan805e3242009-04-06 11:58:25 +0000177 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
Sean MacLennan4ebef312008-05-20 08:28:52 -0500178 if (!np) {
Sean MacLennan805e3242009-04-06 11:58:25 +0000179 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
Sean MacLennan4ebef312008-05-20 08:28:52 -0500180 return -ENOENT;
181 }
182
Sean MacLennan805e3242009-04-06 11:58:25 +0000183 for_each_child_of_node(np, child)
Sean MacLennanba703e12009-06-28 11:22:51 +0000184 if (strcmp(child->name, "green") == 0)
Sean MacLennan805e3242009-04-06 11:58:25 +0000185 green_led = of_get_gpio(child, 0);
Sean MacLennanba703e12009-06-28 11:22:51 +0000186 else if (strcmp(child->name, "red") == 0)
Sean MacLennan805e3242009-04-06 11:58:25 +0000187 red_led = of_get_gpio(child, 0);
Sean MacLennan805e3242009-04-06 11:58:25 +0000188
Sean MacLennan4ebef312008-05-20 08:28:52 -0500189 of_node_put(np);
Sean MacLennan4ebef312008-05-20 08:28:52 -0500190
191 return 0;
192}
193
Sean MacLennan39841142009-06-19 19:43:59 +0000194static void pika_setup_critical_temp(struct device_node *np,
195 struct i2c_client *client)
Sean MacLennan4ebef312008-05-20 08:28:52 -0500196{
Sean MacLennan4ebef312008-05-20 08:28:52 -0500197 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 */
Sean MacLennan048040a2008-07-26 11:45:10 +1000206 i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
Sean MacLennan4ebef312008-05-20 08:28:52 -0500207
Sean MacLennan4ebef312008-05-20 08:28:52 -0500208 irq = irq_of_parse_and_map(np, 0);
Sean MacLennan4ebef312008-05-20 08:28:52 -0500209 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
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100235static int pika_dtm_thread(void __iomem *fpga)
236{
Sean MacLennan39841142009-06-19 19:43:59 +0000237 struct device_node *np;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500238 struct i2c_client *client;
239
Sean MacLennan39841142009-06-19 19:43:59 +0000240 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;
Sean MacLennan4ebef312008-05-20 08:28:52 -0500248 }
249
Sean MacLennan39841142009-06-19 19:43:59 +0000250 pika_setup_critical_temp(np, client);
Sean MacLennan4ebef312008-05-20 08:28:52 -0500251
Sean MacLennan39841142009-06-19 19:43:59 +0000252 of_node_put(np);
Sean MacLennan4ebef312008-05-20 08:28:52 -0500253
Sean MacLennan39841142009-06-19 19:43:59 +0000254 printk(KERN_INFO "Warp DTM thread running.\n");
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100255
256 while (!kthread_should_stop()) {
Sean MacLennan048040a2008-07-26 11:45:10 +1000257 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 }
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100266
Sean MacLennan4ebef312008-05-20 08:28:52 -0500267 pika_dtm_check_fan(fpga);
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100268
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;
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100280
281 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
282 if (np == NULL)
283 return -ENOENT;
284
Sean MacLennan4ebef312008-05-20 08:28:52 -0500285 dtm_fpga = of_iomap(np, 0);
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100286 of_node_put(np);
Sean MacLennan4ebef312008-05-20 08:28:52 -0500287 if (dtm_fpga == NULL)
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100288 return -ENOENT;
289
Sean MacLennan805e3242009-04-06 11:58:25 +0000290 /* Must get post info before thread starts. */
291 warp_post_info();
292
Sean MacLennan4ebef312008-05-20 08:28:52 -0500293 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100294 if (IS_ERR(dtm_thread)) {
Sean MacLennan4ebef312008-05-20 08:28:52 -0500295 iounmap(dtm_fpga);
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100296 return PTR_ERR(dtm_thread);
297 }
298
299 return 0;
300}
Sean MacLennan4ebef312008-05-20 08:28:52 -0500301machine_late_initcall(warp, pika_dtm_start);
302
303#else /* !CONFIG_SENSORS_AD7414 */
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
Sean MacLennan805e3242009-04-06 11:58:25 +0000315machine_late_initcall(warp, warp_post_info);
316
Sean MacLennanf9bdedb2008-01-22 04:55:29 +1100317#endif
Sean MacLennan4ebef312008-05-20 08:28:52 -0500318
319EXPORT_SYMBOL(pika_dtm_register_shutdown);
320EXPORT_SYMBOL(pika_dtm_unregister_shutdown);