summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/44x/warp.c
blob: 501333cf42cf194743528e0017477a095bbf3bfb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
 * PIKA Warp(tm) board specific routines
 *
 * Copyright (c) 2008-2009 PIKA Technologies
 *   Sean MacLennan <smaclennan@pikatech.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/kthread.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include <asm/uic.h>
#include <asm/ppc4xx.h>
#include <asm/dma.h>


static const struct of_device_id warp_of_bus[] __initconst = {
	{ .compatible = "ibm,plb4", },
	{ .compatible = "ibm,opb", },
	{ .compatible = "ibm,ebc", },
	{},
};

static int __init warp_device_probe(void)
{
	of_platform_bus_probe(NULL, warp_of_bus, NULL);
	return 0;
}
machine_device_initcall(warp, warp_device_probe);

static int __init warp_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (!of_flat_dt_is_compatible(root, "pika,warp"))
		return 0;

	/* For __dma_alloc_coherent */
	ISA_DMA_THRESHOLD = ~0L;

	return 1;
}

define_machine(warp) {
	.name		= "Warp",
	.probe 		= warp_probe,
	.progress 	= udbg_progress,
	.init_IRQ 	= uic_init_tree,
	.get_irq 	= uic_get_irq,
	.restart	= ppc4xx_reset_system,
	.calibrate_decr = generic_calibrate_decr,
};


static int __init warp_post_info(void)
{
	struct device_node *np;
	void __iomem *fpga;
	u32 post1, post2;

	/* Sighhhh... POST information is in the sd area. */
	np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
	if (np == NULL)
		return -ENOENT;

	fpga = of_iomap(np, 0);
	of_node_put(np);
	if (fpga == NULL)
		return -ENOENT;

	post1 = in_be32(fpga + 0x40);
	post2 = in_be32(fpga + 0x44);

	iounmap(fpga);

	if (post1 || post2)
		printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
	else
		printk(KERN_INFO "Warp POST OK\n");

	return 0;
}


#ifdef CONFIG_SENSORS_AD7414

static LIST_HEAD(dtm_shutdown_list);
static void __iomem *dtm_fpga;
static unsigned green_led, red_led;


struct dtm_shutdown {
	struct list_head list;
	void (*func)(void *arg);
	void *arg;
};


int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
{
	struct dtm_shutdown *shutdown;

	shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
	if (shutdown == NULL)
		return -ENOMEM;

	shutdown->func = func;
	shutdown->arg = arg;

	list_add(&shutdown->list, &dtm_shutdown_list);

	return 0;
}

int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
{
	struct dtm_shutdown *shutdown;

	list_for_each_entry(shutdown, &dtm_shutdown_list, list)
		if (shutdown->func == func && shutdown->arg == arg) {
			list_del(&shutdown->list);
			kfree(shutdown);
			return 0;
		}

	return -EINVAL;
}

static irqreturn_t temp_isr(int irq, void *context)
{
	struct dtm_shutdown *shutdown;
	int value = 1;

	local_irq_disable();

	gpio_set_value(green_led, 0);

	/* Run through the shutdown list. */
	list_for_each_entry(shutdown, &dtm_shutdown_list, list)
		shutdown->func(shutdown->arg);

	printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");

	while (1) {
		if (dtm_fpga) {
			unsigned reset = in_be32(dtm_fpga + 0x14);
			out_be32(dtm_fpga + 0x14, reset);
		}

		gpio_set_value(red_led, value);
		value ^= 1;
		mdelay(500);
	}

	/* Not reached */
	return IRQ_HANDLED;
}

static int pika_setup_leds(void)
{
	struct device_node *np, *child;

	np = of_find_compatible_node(NULL, NULL, "gpio-leds");
	if (!np) {
		printk(KERN_ERR __FILE__ ": Unable to find leds\n");
		return -ENOENT;
	}

	for_each_child_of_node(np, child)
		if (strcmp(child->name, "green") == 0)
			green_led = of_get_gpio(child, 0);
		else if (strcmp(child->name, "red") == 0)
			red_led = of_get_gpio(child, 0);

	of_node_put(np);

	return 0;
}

static void pika_setup_critical_temp(struct device_node *np,
				     struct i2c_client *client)
{
	int irq, rc;

	/* Do this before enabling critical temp interrupt since we
	 * may immediately interrupt.
	 */
	pika_setup_leds();

	/* These registers are in 1 degree increments. */
	i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
	i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */

	irq = irq_of_parse_and_map(np, 0);
	if (irq  == NO_IRQ) {
		printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
		return;
	}

	rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
	if (rc) {
		printk(KERN_ERR __FILE__
		       ": Unable to request ad7414 irq %d = %d\n", irq, rc);
		return;
	}
}

static inline void pika_dtm_check_fan(void __iomem *fpga)
{
	static int fan_state;
	u32 fan = in_be32(fpga + 0x34) & (1 << 14);

	if (fan_state != fan) {
		fan_state = fan;
		if (fan)
			printk(KERN_WARNING "Fan rotation error detected."
				   " Please check hardware.\n");
	}
}

static int pika_dtm_thread(void __iomem *fpga)
{
	struct device_node *np;
	struct i2c_client *client;

	np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
	if (np == NULL)
		return -ENOENT;

	client = of_find_i2c_device_by_node(np);
	if (client == NULL) {
		of_node_put(np);
		return -ENOENT;
	}

	pika_setup_critical_temp(np, client);

	of_node_put(np);

	printk(KERN_INFO "Warp DTM thread running.\n");

	while (!kthread_should_stop()) {
		int val;

		val = i2c_smbus_read_word_data(client, 0);
		if (val < 0)
			dev_dbg(&client->dev, "DTM read temp failed.\n");
		else {
			s16 temp = swab16(val);
			out_be32(fpga + 0x20, temp);
		}

		pika_dtm_check_fan(fpga);

		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(HZ);
	}

	return 0;
}

static int __init pika_dtm_start(void)
{
	struct task_struct *dtm_thread;
	struct device_node *np;

	np = of_find_compatible_node(NULL, NULL, "pika,fpga");
	if (np == NULL)
		return -ENOENT;

	dtm_fpga = of_iomap(np, 0);
	of_node_put(np);
	if (dtm_fpga == NULL)
		return -ENOENT;

	/* Must get post info before thread starts. */
	warp_post_info();

	dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
	if (IS_ERR(dtm_thread)) {
		iounmap(dtm_fpga);
		return PTR_ERR(dtm_thread);
	}

	return 0;
}
machine_late_initcall(warp, pika_dtm_start);

#else /* !CONFIG_SENSORS_AD7414 */

int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
{
	return 0;
}

int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
{
	return 0;
}

machine_late_initcall(warp, warp_post_info);

#endif

EXPORT_SYMBOL(pika_dtm_register_shutdown);
EXPORT_SYMBOL(pika_dtm_unregister_shutdown);