2 * linux/arch/arm/plat-omap/debug-leds.c
4 * Copyright 2003 by Texas Instruments Incorporated
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.
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/leds.h>
16 #include <asm/hardware.h>
18 #include <asm/system.h>
19 #include <asm/mach-types.h>
21 #include <asm/arch/fpga.h>
22 #include <asm/arch/gpio.h>
25 /* Many OMAP development platforms reuse the same "debug board"; these
26 * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
27 * debug board (all green), accessed through FPGA registers.
29 * The "surfer" expansion board and H2 sample board also have two-color
30 * green+red LEDs (in parallel), used here for timer and idle indicators
31 * in preference to the ones on the debug board, for a "Disco LED" effect.
33 * This driver exports either the original ARM LED API, the new generic
37 static spinlock_t lock;
38 static struct h2p2_dbg_fpga __iomem *fpga;
39 static u16 led_state, hw_led_state;
43 #define old_led_api() 1
45 #define old_led_api() 0
48 #ifdef CONFIG_LEDS_OMAP_DEBUG
49 #define new_led_api() 1
51 #define new_led_api() 0
55 /*-------------------------------------------------------------------------*/
57 /* original ARM debug LED API:
58 * - timer and idle leds (some boards use non-FPGA leds here);
59 * - up to 4 generic leds, easily accessed in-kernel (any context)
62 #define GPIO_LED_RED 3
63 #define GPIO_LED_GREEN OMAP_MPUIO(4)
65 #define LED_STATE_ENABLED 0x01
66 #define LED_STATE_CLAIMED 0x02
67 #define LED_TIMER_ON 0x04
69 #define GPIO_IDLE GPIO_LED_GREEN
70 #define GPIO_TIMER GPIO_LED_RED
72 static void h2p2_dbg_leds_event(led_event_t evt)
76 spin_lock_irqsave(&lock, flags);
78 if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
84 led_state |= LED_STATE_ENABLED;
89 /* all leds off during suspend or shutdown */
91 if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
92 omap_set_gpio_dataout(GPIO_TIMER, 0);
93 omap_set_gpio_dataout(GPIO_IDLE, 0);
96 __raw_writew(~0, &fpga->leds);
97 led_state &= ~LED_STATE_ENABLED;
101 led_state |= LED_STATE_CLAIMED;
106 led_state &= ~LED_STATE_CLAIMED;
109 #ifdef CONFIG_LEDS_TIMER
111 led_state ^= LED_TIMER_ON;
113 if (machine_is_omap_perseus2() || machine_is_omap_h4())
114 hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
116 omap_set_gpio_dataout(GPIO_TIMER,
117 led_state & LED_TIMER_ON);
124 #ifdef CONFIG_LEDS_CPU
125 /* LED lit iff busy */
127 if (machine_is_omap_perseus2() || machine_is_omap_h4())
128 hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
130 omap_set_gpio_dataout(GPIO_IDLE, 1);
137 if (machine_is_omap_perseus2() || machine_is_omap_h4())
138 hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
140 omap_set_gpio_dataout(GPIO_IDLE, 0);
148 hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
151 hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
155 hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
158 hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
162 hw_led_state |= H2P2_DBG_FPGA_LED_RED;
165 hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
169 hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
172 hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
181 * Actually burn the LEDs
183 if (led_state & LED_STATE_ENABLED)
184 __raw_writew(~hw_led_state, &fpga->leds);
187 spin_unlock_irqrestore(&lock, flags);
190 /*-------------------------------------------------------------------------*/
193 * - with syfs access and generic triggering
194 * - not readily accessible to in-kernel drivers
198 struct led_classdev cdev;
202 static struct dbg_led dbg_leds[] = {
203 /* REVISIT at least H2 uses different timer & cpu leds... */
204 #ifndef CONFIG_LEDS_TIMER
205 { .mask = 1 << 0, .cdev.name = "d4:green", }, /* timer */
207 #ifndef CONFIG_LEDS_CPU
208 { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */
210 { .mask = 1 << 2, .cdev.name = "d6:green", },
211 { .mask = 1 << 3, .cdev.name = "d7:green", },
213 { .mask = 1 << 4, .cdev.name = "d8:green", },
214 { .mask = 1 << 5, .cdev.name = "d9:green", },
215 { .mask = 1 << 6, .cdev.name = "d10:green", },
216 { .mask = 1 << 7, .cdev.name = "d11:green", },
218 { .mask = 1 << 8, .cdev.name = "d12:green", },
219 { .mask = 1 << 9, .cdev.name = "d13:green", },
220 { .mask = 1 << 10, .cdev.name = "d14:green", },
221 { .mask = 1 << 11, .cdev.name = "d15:green", },
224 { .mask = 1 << 12, .cdev.name = "d16:green", },
225 { .mask = 1 << 13, .cdev.name = "d17:green", },
226 { .mask = 1 << 14, .cdev.name = "d18:green", },
227 { .mask = 1 << 15, .cdev.name = "d19:green", },
232 fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
234 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
237 spin_lock_irqsave(&lock, flags);
238 if (value == LED_OFF)
239 hw_led_state &= ~led->mask;
241 hw_led_state |= led->mask;
242 __raw_writew(~hw_led_state, &fpga->leds);
243 spin_unlock_irqrestore(&lock, flags);
246 static void __init newled_init(struct device *dev)
252 for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
253 led->cdev.brightness_set = fpga_led_set;
254 status = led_classdev_register(dev, &led->cdev);
262 /*-------------------------------------------------------------------------*/
264 static int /* __init */ fpga_probe(struct platform_device *pdev)
266 struct resource *iomem;
268 spin_lock_init(&lock);
270 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
274 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
275 __raw_writew(~0, &fpga->leds);
278 leds_event = h2p2_dbg_leds_event;
279 leds_event(led_start);
283 newled_init(&pdev->dev);
289 static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg)
291 __raw_writew(~0, &fpga->leds);
295 static int fpga_resume_early(struct platform_device *pdev)
297 __raw_writew(~hw_led_state, &fpga->leds);
302 static struct platform_driver led_driver = {
303 .driver.name = "omap_dbg_led",
305 .suspend_late = fpga_suspend_late,
306 .resume_early = fpga_resume_early,
309 static int __init fpga_init(void)
311 if (machine_is_omap_h4()
312 || machine_is_omap_h3()
313 || machine_is_omap_h2()
314 || machine_is_omap_perseus2()
316 return platform_driver_register(&led_driver);
319 fs_initcall(fpga_init);