1 /*
2 * linux/arch/arm/plat-omap/debug-leds.c
3 *
4 * Copyright 2003 by Texas Instruments Incorporated
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/gpio.h>
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/leds.h>
14 #include <linux/io.h>
15
16 #include <mach/hardware.h>
17 #include <asm/leds.h>
18 #include <asm/system.h>
19 #include <asm/mach-types.h>
20
21 #include <plat/fpga.h>
22
23
24 /* Many OMAP development platforms reuse the same "debug board"; these
25 * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
26 * debug board (all green), accessed through FPGA registers.
27 *
28 * The "surfer" expansion board and H2 sample board also have two-color
29 * green+red LEDs (in parallel), used here for timer and idle indicators
30 * in preference to the ones on the debug board, for a "Disco LED" effect.
31 *
32 * This driver exports either the original ARM LED API, the new generic
33 * one, or both.
34 */
35
36 static spinlock_t lock;
37 static struct h2p2_dbg_fpga __iomem *fpga;
38 static u16 led_state, hw_led_state;
39
40
41 #ifdef CONFIG_OMAP_DEBUG_LEDS
42 #define new_led_api() 1
43 #else
44 #define new_led_api() 0
45 #endif
46
47
48 /*-------------------------------------------------------------------------*/
49
50 /* original ARM debug LED API:
51 * - timer and idle leds (some boards use non-FPGA leds here);
52 * - up to 4 generic leds, easily accessed in-kernel (any context)
53 */
54
55 #define GPIO_LED_RED 3
56 #define GPIO_LED_GREEN OMAP_MPUIO(4)
57
58 #define LED_STATE_ENABLED 0x01
59 #define LED_STATE_CLAIMED 0x02
60 #define LED_TIMER_ON 0x04
61
62 #define GPIO_IDLE GPIO_LED_GREEN
63 #define GPIO_TIMER GPIO_LED_RED
64
h2p2_dbg_leds_event(led_event_t evt)65 static void h2p2_dbg_leds_event(led_event_t evt)
66 {
67 unsigned long flags;
68
69 spin_lock_irqsave(&lock, flags);
70
71 if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
72 goto done;
73
74 switch (evt) {
75 case led_start:
76 if (fpga)
77 led_state |= LED_STATE_ENABLED;
78 break;
79
80 case led_stop:
81 case led_halted:
82 /* all leds off during suspend or shutdown */
83
84 if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
85 gpio_set_value(GPIO_TIMER, 0);
86 gpio_set_value(GPIO_IDLE, 0);
87 }
88
89 __raw_writew(~0, &fpga->leds);
90 led_state &= ~LED_STATE_ENABLED;
91 goto done;
92
93 case led_claim:
94 led_state |= LED_STATE_CLAIMED;
95 hw_led_state = 0;
96 break;
97
98 case led_release:
99 led_state &= ~LED_STATE_CLAIMED;
100 break;
101
102 #ifdef CONFIG_LEDS_TIMER
103 case led_timer:
104 led_state ^= LED_TIMER_ON;
105
106 if (machine_is_omap_perseus2() || machine_is_omap_h4())
107 hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
108 else {
109 gpio_set_value(GPIO_TIMER,
110 led_state & LED_TIMER_ON);
111 goto done;
112 }
113
114 break;
115 #endif
116
117 #ifdef CONFIG_LEDS_CPU
118 /* LED lit iff busy */
119 case led_idle_start:
120 if (machine_is_omap_perseus2() || machine_is_omap_h4())
121 hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
122 else {
123 gpio_set_value(GPIO_IDLE, 1);
124 goto done;
125 }
126
127 break;
128
129 case led_idle_end:
130 if (machine_is_omap_perseus2() || machine_is_omap_h4())
131 hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
132 else {
133 gpio_set_value(GPIO_IDLE, 0);
134 goto done;
135 }
136
137 break;
138 #endif
139
140 case led_green_on:
141 hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
142 break;
143 case led_green_off:
144 hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
145 break;
146
147 case led_amber_on:
148 hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
149 break;
150 case led_amber_off:
151 hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
152 break;
153
154 case led_red_on:
155 hw_led_state |= H2P2_DBG_FPGA_LED_RED;
156 break;
157 case led_red_off:
158 hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
159 break;
160
161 case led_blue_on:
162 hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
163 break;
164 case led_blue_off:
165 hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
166 break;
167
168 default:
169 break;
170 }
171
172
173 /*
174 * Actually burn the LEDs
175 */
176 if (led_state & LED_STATE_ENABLED)
177 __raw_writew(~hw_led_state, &fpga->leds);
178
179 done:
180 spin_unlock_irqrestore(&lock, flags);
181 }
182
183 /*-------------------------------------------------------------------------*/
184
185 /* "new" LED API
186 * - with syfs access and generic triggering
187 * - not readily accessible to in-kernel drivers
188 */
189
190 struct dbg_led {
191 struct led_classdev cdev;
192 u16 mask;
193 };
194
195 static struct dbg_led dbg_leds[] = {
196 /* REVISIT at least H2 uses different timer & cpu leds... */
197 #ifndef CONFIG_LEDS_TIMER
198 { .mask = 1 << 0, .cdev.name = "d4:green",
199 .cdev.default_trigger = "heartbeat", },
200 #endif
201 #ifndef CONFIG_LEDS_CPU
202 { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */
203 #endif
204 { .mask = 1 << 2, .cdev.name = "d6:green", },
205 { .mask = 1 << 3, .cdev.name = "d7:green", },
206
207 { .mask = 1 << 4, .cdev.name = "d8:green", },
208 { .mask = 1 << 5, .cdev.name = "d9:green", },
209 { .mask = 1 << 6, .cdev.name = "d10:green", },
210 { .mask = 1 << 7, .cdev.name = "d11:green", },
211
212 { .mask = 1 << 8, .cdev.name = "d12:green", },
213 { .mask = 1 << 9, .cdev.name = "d13:green", },
214 { .mask = 1 << 10, .cdev.name = "d14:green", },
215 { .mask = 1 << 11, .cdev.name = "d15:green", },
216
217 #ifndef CONFIG_LEDS
218 { .mask = 1 << 12, .cdev.name = "d16:green", },
219 { .mask = 1 << 13, .cdev.name = "d17:green", },
220 { .mask = 1 << 14, .cdev.name = "d18:green", },
221 { .mask = 1 << 15, .cdev.name = "d19:green", },
222 #endif
223 };
224
225 static void
fpga_led_set(struct led_classdev * cdev,enum led_brightness value)226 fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
227 {
228 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
229 unsigned long flags;
230
231 spin_lock_irqsave(&lock, flags);
232 if (value == LED_OFF)
233 hw_led_state &= ~led->mask;
234 else
235 hw_led_state |= led->mask;
236 __raw_writew(~hw_led_state, &fpga->leds);
237 spin_unlock_irqrestore(&lock, flags);
238 }
239
newled_init(struct device * dev)240 static void __init newled_init(struct device *dev)
241 {
242 unsigned i;
243 struct dbg_led *led;
244 int status;
245
246 for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
247 led->cdev.brightness_set = fpga_led_set;
248 status = led_classdev_register(dev, &led->cdev);
249 if (status < 0)
250 break;
251 }
252 return;
253 }
254
255
256 /*-------------------------------------------------------------------------*/
257
fpga_probe(struct platform_device * pdev)258 static int /* __init */ fpga_probe(struct platform_device *pdev)
259 {
260 struct resource *iomem;
261
262 spin_lock_init(&lock);
263
264 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
265 if (!iomem)
266 return -ENODEV;
267
268 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
269 __raw_writew(~0, &fpga->leds);
270
271 #ifdef CONFIG_LEDS
272 leds_event = h2p2_dbg_leds_event;
273 leds_event(led_start);
274 #endif
275
276 if (new_led_api()) {
277 newled_init(&pdev->dev);
278 }
279
280 return 0;
281 }
282
fpga_suspend_noirq(struct device * dev)283 static int fpga_suspend_noirq(struct device *dev)
284 {
285 __raw_writew(~0, &fpga->leds);
286 return 0;
287 }
288
fpga_resume_noirq(struct device * dev)289 static int fpga_resume_noirq(struct device *dev)
290 {
291 __raw_writew(~hw_led_state, &fpga->leds);
292 return 0;
293 }
294
295 static const struct dev_pm_ops fpga_dev_pm_ops = {
296 .suspend_noirq = fpga_suspend_noirq,
297 .resume_noirq = fpga_resume_noirq,
298 };
299
300 static struct platform_driver led_driver = {
301 .driver.name = "omap_dbg_led",
302 .driver.pm = &fpga_dev_pm_ops,
303 .probe = fpga_probe,
304 };
305
fpga_init(void)306 static int __init fpga_init(void)
307 {
308 if (machine_is_omap_h4()
309 || machine_is_omap_h3()
310 || machine_is_omap_h2()
311 || machine_is_omap_perseus2()
312 )
313 return platform_driver_register(&led_driver);
314 return 0;
315 }
316 fs_initcall(fpga_init);
317