aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-omap/debug-leds.c
blob: 9395898dd49a38b5d0e517108580bf3cc0365f0b (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
/*
 * linux/arch/arm/plat-omap/debug-leds.c
 *
 * Copyright 2003 by Texas Instruments Incorporated
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <asm/mach-types.h>

#include <mach/fpga.h>
#include <mach/gpio.h>


/* Many OMAP development platforms reuse the same "debug board"; these
 * platforms include H2, H3, H4, and Perseus2.  There are 16 LEDs on the
 * debug board (all green), accessed through FPGA registers.
 *
 * The "surfer" expansion board and H2 sample board also have two-color
 * green+red LEDs (in parallel), used here for timer and idle indicators
 * in preference to the ones on the debug board, for a "Disco LED" effect.
 *
 * This driver exports either the original ARM LED API, the new generic
 * one, or both.
 */

static spinlock_t			lock;
static struct h2p2_dbg_fpga __iomem	*fpga;
static u16				led_state, hw_led_state;


#ifdef	CONFIG_LEDS_OMAP_DEBUG
#define new_led_api()	1
#else
#define new_led_api()	0
#endif


/*-------------------------------------------------------------------------*/

/* original ARM debug LED API:
 *  - timer and idle leds (some boards use non-FPGA leds here);
 *  - up to 4 generic leds, easily accessed in-kernel (any context)
 */

#define GPIO_LED_RED		3
#define GPIO_LED_GREEN		OMAP_MPUIO(4)

#define LED_STATE_ENABLED	0x01
#define LED_STATE_CLAIMED	0x02
#define LED_TIMER_ON		0x04

#define GPIO_IDLE		GPIO_LED_GREEN
#define GPIO_TIMER		GPIO_LED_RED

static void h2p2_dbg_leds_event(led_event_t evt)
{
	unsigned long flags;

	spin_lock_irqsave(&lock, flags);

	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
		goto done;

	switch (evt) {
	case led_start:
		if (fpga)
			led_state |= LED_STATE_ENABLED;
		break;

	case led_stop:
	case led_halted:
		/* all leds off during suspend or shutdown */

		if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
			gpio_set_value(GPIO_TIMER, 0);
			gpio_set_value(GPIO_IDLE, 0);
		}

		__raw_writew(~0, &fpga->leds);
		led_state &= ~LED_STATE_ENABLED;
		goto done;

	case led_claim:
		led_state |= LED_STATE_CLAIMED;
		hw_led_state = 0;
		break;

	case led_release:
		led_state &= ~LED_STATE_CLAIMED;
		break;

#ifdef CONFIG_LEDS_TIMER
	case led_timer:
		led_state ^= LED_TIMER_ON;

		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
		else {
			gpio_set_value(GPIO_TIMER,
					led_state & LED_TIMER_ON);
			goto done;
		}

		break;
#endif

#ifdef CONFIG_LEDS_CPU
	/* LED lit iff busy */
	case led_idle_start:
		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
		else {
			gpio_set_value(GPIO_IDLE, 1);
			goto done;
		}

		break;

	case led_idle_end:
		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
		else {
			gpio_set_value(GPIO_IDLE, 0);
			goto done;
		}

		break;
#endif

	case led_green_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
		break;
	case led_green_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
		break;

	case led_amber_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
		break;
	case led_amber_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
		break;

	case led_red_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_RED;
		break;
	case led_red_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
		break;

	case led_blue_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
		break;
	case led_blue_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
		break;

	default:
		break;
	}


	/*
	 *  Actually burn the LEDs
	 */
	if (led_state & LED_STATE_ENABLED)
		__raw_writew(~hw_led_state, &fpga->leds);

done:
	spin_unlock_irqrestore(&lock, flags);
}

/*-------------------------------------------------------------------------*/

/* "new" LED API
 *  - with syfs access and generic triggering
 *  - not readily accessible to in-kernel drivers
 */

struct dbg_led {
	struct led_classdev	cdev;
	u16			mask;
};

static struct dbg_led dbg_leds[] = {
	/* REVISIT at least H2 uses different timer & cpu leds... */
#ifndef CONFIG_LEDS_TIMER
	{ .mask = 1 << 0,  .cdev.name =  "d4:green",
		.cdev.default_trigger = "heartbeat", },
#endif
#ifndef CONFIG_LEDS_CPU
	{ .mask = 1 << 1,  .cdev.name =  "d5:green", },		/* !idle */
#endif
	{ .mask = 1 << 2,  .cdev.name =  "d6:green", },
	{ .mask = 1 << 3,  .cdev.name =  "d7:green", },

	{ .mask = 1 << 4,  .cdev.name =  "d8:green", },
	{ .mask = 1 << 5,  .cdev.name =  "d9:green", },
	{ .mask = 1 << 6,  .cdev.name = "d10:green", },
	{ .mask = 1 << 7,  .cdev.name = "d11:green", },

	{ .mask = 1 << 8,  .cdev.name = "d12:green", },
	{ .mask = 1 << 9,  .cdev.name = "d13:green", },
	{ .mask = 1 << 10, .cdev.name = "d14:green", },
	{ .mask = 1 << 11, .cdev.name = "d15:green", },

#ifndef	CONFIG_LEDS
	{ .mask = 1 << 12, .cdev.name = "d16:green", },
	{ .mask = 1 << 13, .cdev.name = "d17:green", },
	{ .mask = 1 << 14, .cdev.name = "d18:green", },
	{ .mask = 1 << 15, .cdev.name = "d19:green", },
#endif
};

static void
fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
{
	struct dbg_led	*led = container_of(cdev, struct dbg_led, cdev);
	unsigned long	flags;

	spin_lock_irqsave(&lock, flags);
	if (value == LED_OFF)
		hw_led_state &= ~led->mask;
	else
		hw_led_state |= led->mask;
	__raw_writew(~hw_led_state, &fpga->leds);
	spin_unlock_irqrestore(&lock, flags);
}

static void __init newled_init(struct device *dev)
{
	unsigned	i;
	struct dbg_led	*led;
	int		status;

	for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
		led->cdev.brightness_set = fpga_led_set;
		status = led_classdev_register(dev, &led->cdev);
		if (status < 0)
			break;
	}
	return;
}


/*-------------------------------------------------------------------------*/

static int /* __init */ fpga_probe(struct platform_device *pdev)
{
	struct resource	*iomem;

	spin_lock_init(&lock);

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem)
		return -ENODEV;

	fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
	__raw_writew(~0, &fpga->leds);

#ifdef	CONFIG_LEDS
	leds_event = h2p2_dbg_leds_event;
	leds_event(led_start);
#endif

	if (new_led_api()) {
		newled_init(&pdev->dev);
	}

	return 0;
}

static int fpga_suspend_noirq(struct device *dev)
{
	__raw_writew(~0, &fpga->leds);
	return 0;
}

static int fpga_resume_noirq(struct device *dev)
{
	__raw_writew(~hw_led_state, &fpga->leds);
	return 0;
}

static struct dev_pm_ops fpga_dev_pm_ops = {
	.suspend_noirq = fpga_suspend_noirq,
	.resume_noirq = fpga_resume_noirq,
};

static struct platform_driver led_driver = {
	.driver.name	= "omap_dbg_led",
	.driver.pm	= &fpga_dev_pm_ops,
	.probe		= fpga_probe,
};

static int __init fpga_init(void)
{
	if (machine_is_omap_h4()
			|| machine_is_omap_h3()
			|| machine_is_omap_h2()
			|| machine_is_omap_perseus2()
			)
		return platform_driver_register(&led_driver);
	return 0;
}
fs_initcall(fpga_init);