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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 | |
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 | #include <mach/gpio.h> |
23 | |
24 | |
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. |
28 | * |
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. |
32 | * |
33 | * This driver exports either the original ARM LED API, the new generic |
34 | * one, or both. |
35 | */ |
36 | |
37 | static spinlock_t lock; |
38 | static struct h2p2_dbg_fpga __iomem *fpga; |
39 | static u16 led_state, hw_led_state; |
40 | |
41 | |
42 | #ifdef CONFIG_OMAP_DEBUG_LEDS |
43 | #define new_led_api() 1 |
44 | #else |
45 | #define new_led_api() 0 |
46 | #endif |
47 | |
48 | |
49 | /*-------------------------------------------------------------------------*/ |
50 | |
51 | /* original ARM debug LED API: |
52 | * - timer and idle leds (some boards use non-FPGA leds here); |
53 | * - up to 4 generic leds, easily accessed in-kernel (any context) |
54 | */ |
55 | |
56 | #define GPIO_LED_RED 3 |
57 | #define GPIO_LED_GREEN OMAP_MPUIO(4) |
58 | |
59 | #define LED_STATE_ENABLED 0x01 |
60 | #define LED_STATE_CLAIMED 0x02 |
61 | #define LED_TIMER_ON 0x04 |
62 | |
63 | #define GPIO_IDLE GPIO_LED_GREEN |
64 | #define GPIO_TIMER GPIO_LED_RED |
65 | |
66 | static void h2p2_dbg_leds_event(led_event_t evt) |
67 | { |
68 | unsigned long flags; |
69 | |
70 | spin_lock_irqsave(&lock, flags); |
71 | |
72 | if (!(led_state & LED_STATE_ENABLED) && evt != led_start) |
73 | goto done; |
74 | |
75 | switch (evt) { |
76 | case led_start: |
77 | if (fpga) |
78 | led_state |= LED_STATE_ENABLED; |
79 | break; |
80 | |
81 | case led_stop: |
82 | case led_halted: |
83 | /* all leds off during suspend or shutdown */ |
84 | |
85 | if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) { |
86 | gpio_set_value(GPIO_TIMER, 0); |
87 | gpio_set_value(GPIO_IDLE, 0); |
88 | } |
89 | |
90 | __raw_writew(~0, &fpga->leds); |
91 | led_state &= ~LED_STATE_ENABLED; |
92 | goto done; |
93 | |
94 | case led_claim: |
95 | led_state |= LED_STATE_CLAIMED; |
96 | hw_led_state = 0; |
97 | break; |
98 | |
99 | case led_release: |
100 | led_state &= ~LED_STATE_CLAIMED; |
101 | break; |
102 | |
103 | #ifdef CONFIG_LEDS_TIMER |
104 | case led_timer: |
105 | led_state ^= LED_TIMER_ON; |
106 | |
107 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
108 | hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER; |
109 | else { |
110 | gpio_set_value(GPIO_TIMER, |
111 | led_state & LED_TIMER_ON); |
112 | goto done; |
113 | } |
114 | |
115 | break; |
116 | #endif |
117 | |
118 | #ifdef CONFIG_LEDS_CPU |
119 | /* LED lit iff busy */ |
120 | case led_idle_start: |
121 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
122 | hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE; |
123 | else { |
124 | gpio_set_value(GPIO_IDLE, 1); |
125 | goto done; |
126 | } |
127 | |
128 | break; |
129 | |
130 | case led_idle_end: |
131 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
132 | hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE; |
133 | else { |
134 | gpio_set_value(GPIO_IDLE, 0); |
135 | goto done; |
136 | } |
137 | |
138 | break; |
139 | #endif |
140 | |
141 | case led_green_on: |
142 | hw_led_state |= H2P2_DBG_FPGA_LED_GREEN; |
143 | break; |
144 | case led_green_off: |
145 | hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN; |
146 | break; |
147 | |
148 | case led_amber_on: |
149 | hw_led_state |= H2P2_DBG_FPGA_LED_AMBER; |
150 | break; |
151 | case led_amber_off: |
152 | hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER; |
153 | break; |
154 | |
155 | case led_red_on: |
156 | hw_led_state |= H2P2_DBG_FPGA_LED_RED; |
157 | break; |
158 | case led_red_off: |
159 | hw_led_state &= ~H2P2_DBG_FPGA_LED_RED; |
160 | break; |
161 | |
162 | case led_blue_on: |
163 | hw_led_state |= H2P2_DBG_FPGA_LED_BLUE; |
164 | break; |
165 | case led_blue_off: |
166 | hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE; |
167 | break; |
168 | |
169 | default: |
170 | break; |
171 | } |
172 | |
173 | |
174 | /* |
175 | * Actually burn the LEDs |
176 | */ |
177 | if (led_state & LED_STATE_ENABLED) |
178 | __raw_writew(~hw_led_state, &fpga->leds); |
179 | |
180 | done: |
181 | spin_unlock_irqrestore(&lock, flags); |
182 | } |
183 | |
184 | /*-------------------------------------------------------------------------*/ |
185 | |
186 | /* "new" LED API |
187 | * - with syfs access and generic triggering |
188 | * - not readily accessible to in-kernel drivers |
189 | */ |
190 | |
191 | struct dbg_led { |
192 | struct led_classdev cdev; |
193 | u16 mask; |
194 | }; |
195 | |
196 | static struct dbg_led dbg_leds[] = { |
197 | /* REVISIT at least H2 uses different timer & cpu leds... */ |
198 | #ifndef CONFIG_LEDS_TIMER |
199 | { .mask = 1 << 0, .cdev.name = "d4:green", |
200 | .cdev.default_trigger = "heartbeat", }, |
201 | #endif |
202 | #ifndef CONFIG_LEDS_CPU |
203 | { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */ |
204 | #endif |
205 | { .mask = 1 << 2, .cdev.name = "d6:green", }, |
206 | { .mask = 1 << 3, .cdev.name = "d7:green", }, |
207 | |
208 | { .mask = 1 << 4, .cdev.name = "d8:green", }, |
209 | { .mask = 1 << 5, .cdev.name = "d9:green", }, |
210 | { .mask = 1 << 6, .cdev.name = "d10:green", }, |
211 | { .mask = 1 << 7, .cdev.name = "d11:green", }, |
212 | |
213 | { .mask = 1 << 8, .cdev.name = "d12:green", }, |
214 | { .mask = 1 << 9, .cdev.name = "d13:green", }, |
215 | { .mask = 1 << 10, .cdev.name = "d14:green", }, |
216 | { .mask = 1 << 11, .cdev.name = "d15:green", }, |
217 | |
218 | #ifndef CONFIG_LEDS |
219 | { .mask = 1 << 12, .cdev.name = "d16:green", }, |
220 | { .mask = 1 << 13, .cdev.name = "d17:green", }, |
221 | { .mask = 1 << 14, .cdev.name = "d18:green", }, |
222 | { .mask = 1 << 15, .cdev.name = "d19:green", }, |
223 | #endif |
224 | }; |
225 | |
226 | static void |
227 | fpga_led_set(struct led_classdev *cdev, enum led_brightness value) |
228 | { |
229 | struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); |
230 | unsigned long flags; |
231 | |
232 | spin_lock_irqsave(&lock, flags); |
233 | if (value == LED_OFF) |
234 | hw_led_state &= ~led->mask; |
235 | else |
236 | hw_led_state |= led->mask; |
237 | __raw_writew(~hw_led_state, &fpga->leds); |
238 | spin_unlock_irqrestore(&lock, flags); |
239 | } |
240 | |
241 | static void __init newled_init(struct device *dev) |
242 | { |
243 | unsigned i; |
244 | struct dbg_led *led; |
245 | int status; |
246 | |
247 | for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) { |
248 | led->cdev.brightness_set = fpga_led_set; |
249 | status = led_classdev_register(dev, &led->cdev); |
250 | if (status < 0) |
251 | break; |
252 | } |
253 | return; |
254 | } |
255 | |
256 | |
257 | /*-------------------------------------------------------------------------*/ |
258 | |
259 | static int /* __init */ fpga_probe(struct platform_device *pdev) |
260 | { |
261 | struct resource *iomem; |
262 | |
263 | spin_lock_init(&lock); |
264 | |
265 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
266 | if (!iomem) |
267 | return -ENODEV; |
268 | |
269 | fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE); |
270 | __raw_writew(~0, &fpga->leds); |
271 | |
272 | #ifdef CONFIG_LEDS |
273 | leds_event = h2p2_dbg_leds_event; |
274 | leds_event(led_start); |
275 | #endif |
276 | |
277 | if (new_led_api()) { |
278 | newled_init(&pdev->dev); |
279 | } |
280 | |
281 | return 0; |
282 | } |
283 | |
284 | static int fpga_suspend_noirq(struct device *dev) |
285 | { |
286 | __raw_writew(~0, &fpga->leds); |
287 | return 0; |
288 | } |
289 | |
290 | static int fpga_resume_noirq(struct device *dev) |
291 | { |
292 | __raw_writew(~hw_led_state, &fpga->leds); |
293 | return 0; |
294 | } |
295 | |
296 | static const struct dev_pm_ops fpga_dev_pm_ops = { |
297 | .suspend_noirq = fpga_suspend_noirq, |
298 | .resume_noirq = fpga_resume_noirq, |
299 | }; |
300 | |
301 | static struct platform_driver led_driver = { |
302 | .driver.name = "omap_dbg_led", |
303 | .driver.pm = &fpga_dev_pm_ops, |
304 | .probe = fpga_probe, |
305 | }; |
306 | |
307 | static int __init fpga_init(void) |
308 | { |
309 | if (machine_is_omap_h4() |
310 | || machine_is_omap_h3() |
311 | || machine_is_omap_h2() |
312 | || machine_is_omap_perseus2() |
313 | ) |
314 | return platform_driver_register(&led_driver); |
315 | return 0; |
316 | } |
317 | fs_initcall(fpga_init); |
318 |
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