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-rw-r--r--arch/arm/plat-omap/debug-leds.c293
1 files changed, 67 insertions, 226 deletions
diff --git a/arch/arm/plat-omap/debug-leds.c b/arch/arm/plat-omap/debug-leds.c
index 195aaae65872..ea29bbe8e5cf 100644
--- a/arch/arm/plat-omap/debug-leds.c
+++ b/arch/arm/plat-omap/debug-leds.c
@@ -1,280 +1,119 @@
1/* 1/*
2 * linux/arch/arm/plat-omap/debug-leds.c 2 * linux/arch/arm/plat-omap/debug-leds.c
3 * 3 *
4 * Copyright 2011 by Bryan Wu <bryan.wu@canonical.com>
4 * Copyright 2003 by Texas Instruments Incorporated 5 * Copyright 2003 by Texas Instruments Incorporated
5 * 6 *
6 * This program is free software; you can redistribute it and/or modify 7 * 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 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation. 9 * published by the Free Software Foundation.
9 */ 10 */
10#include <linux/gpio.h> 11
12#include <linux/kernel.h>
11#include <linux/init.h> 13#include <linux/init.h>
12#include <linux/platform_device.h> 14#include <linux/platform_device.h>
13#include <linux/leds.h> 15#include <linux/leds.h>
14#include <linux/io.h> 16#include <linux/io.h>
15#include <linux/platform_data/gpio-omap.h> 17#include <linux/platform_data/gpio-omap.h>
18#include <linux/slab.h>
16 19
17#include <mach/hardware.h> 20#include <mach/hardware.h>
18#include <asm/leds.h>
19#include <asm/mach-types.h> 21#include <asm/mach-types.h>
20 22
21#include <plat/fpga.h> 23#include <plat/fpga.h>
22 24
23
24/* Many OMAP development platforms reuse the same "debug board"; these 25/* 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 * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
26 * debug board (all green), accessed through FPGA registers. 27 * 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
36static spinlock_t lock;
37static struct h2p2_dbg_fpga __iomem *fpga;
38static 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 */ 28 */
54 29
55#define GPIO_LED_RED 3 30static struct h2p2_dbg_fpga __iomem *fpga;
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
65static 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 31
129 case led_idle_end: 32static u16 fpga_led_state;
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
179done:
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 33
190struct dbg_led { 34struct dbg_led {
191 struct led_classdev cdev; 35 struct led_classdev cdev;
192 u16 mask; 36 u16 mask;
193}; 37};
194 38
195static struct dbg_led dbg_leds[] = { 39static const struct {
196 /* REVISIT at least H2 uses different timer & cpu leds... */ 40 const char *name;
197#ifndef CONFIG_LEDS_TIMER 41 const char *trigger;
198 { .mask = 1 << 0, .cdev.name = "d4:green", 42} dbg_leds[] = {
199 .cdev.default_trigger = "heartbeat", }, 43 { "dbg:d4", "heartbeat", },
200#endif 44 { "dbg:d5", "cpu0", },
201#ifndef CONFIG_LEDS_CPU 45 { "dbg:d6", "default-on", },
202 { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */ 46 { "dbg:d7", },
203#endif 47 { "dbg:d8", },
204 { .mask = 1 << 2, .cdev.name = "d6:green", }, 48 { "dbg:d9", },
205 { .mask = 1 << 3, .cdev.name = "d7:green", }, 49 { "dbg:d10", },
206 50 { "dbg:d11", },
207 { .mask = 1 << 4, .cdev.name = "d8:green", }, 51 { "dbg:d12", },
208 { .mask = 1 << 5, .cdev.name = "d9:green", }, 52 { "dbg:d13", },
209 { .mask = 1 << 6, .cdev.name = "d10:green", }, 53 { "dbg:d14", },
210 { .mask = 1 << 7, .cdev.name = "d11:green", }, 54 { "dbg:d15", },
211 55 { "dbg:d16", },
212 { .mask = 1 << 8, .cdev.name = "d12:green", }, 56 { "dbg:d17", },
213 { .mask = 1 << 9, .cdev.name = "d13:green", }, 57 { "dbg:d18", },
214 { .mask = 1 << 10, .cdev.name = "d14:green", }, 58 { "dbg:d19", },
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}; 59};
224 60
225static void 61/*
226fpga_led_set(struct led_classdev *cdev, enum led_brightness value) 62 * The triggers lines up below will only be used if the
63 * LED triggers are compiled in.
64 */
65static void dbg_led_set(struct led_classdev *cdev,
66 enum led_brightness b)
227{ 67{
228 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); 68 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
229 unsigned long flags; 69 u16 reg;
230 70
231 spin_lock_irqsave(&lock, flags); 71 reg = __raw_readw(&fpga->leds);
232 if (value == LED_OFF) 72 if (b != LED_OFF)
233 hw_led_state &= ~led->mask; 73 reg |= led->mask;
234 else 74 else
235 hw_led_state |= led->mask; 75 reg &= ~led->mask;
236 __raw_writew(~hw_led_state, &fpga->leds); 76 __raw_writew(reg, &fpga->leds);
237 spin_unlock_irqrestore(&lock, flags);
238} 77}
239 78
240static void __init newled_init(struct device *dev) 79static enum led_brightness dbg_led_get(struct led_classdev *cdev)
241{ 80{
242 unsigned i; 81 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
243 struct dbg_led *led; 82 u16 reg;
244 int status;
245 83
246 for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) { 84 reg = __raw_readw(&fpga->leds);
247 led->cdev.brightness_set = fpga_led_set; 85 return (reg & led->mask) ? LED_FULL : LED_OFF;
248 status = led_classdev_register(dev, &led->cdev);
249 if (status < 0)
250 break;
251 }
252 return;
253} 86}
254 87
255 88static int fpga_probe(struct platform_device *pdev)
256/*-------------------------------------------------------------------------*/
257
258static int /* __init */ fpga_probe(struct platform_device *pdev)
259{ 89{
260 struct resource *iomem; 90 struct resource *iomem;
261 91 int i;
262 spin_lock_init(&lock);
263 92
264 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 93 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
265 if (!iomem) 94 if (!iomem)
266 return -ENODEV; 95 return -ENODEV;
267 96
268 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE); 97 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
269 __raw_writew(~0, &fpga->leds); 98 __raw_writew(0xff, &fpga->leds);
99
100 for (i = 0; i < ARRAY_SIZE(dbg_leds); i++) {
101 struct dbg_led *led;
102
103 led = kzalloc(sizeof(*led), GFP_KERNEL);
104 if (!led)
105 break;
270 106
271#ifdef CONFIG_LEDS 107 led->cdev.name = dbg_leds[i].name;
272 leds_event = h2p2_dbg_leds_event; 108 led->cdev.brightness_set = dbg_led_set;
273 leds_event(led_start); 109 led->cdev.brightness_get = dbg_led_get;
274#endif 110 led->cdev.default_trigger = dbg_leds[i].trigger;
111 led->mask = BIT(i);
275 112
276 if (new_led_api()) { 113 if (led_classdev_register(NULL, &led->cdev) < 0) {
277 newled_init(&pdev->dev); 114 kfree(led);
115 break;
116 }
278 } 117 }
279 118
280 return 0; 119 return 0;
@@ -282,13 +121,15 @@ static int /* __init */ fpga_probe(struct platform_device *pdev)
282 121
283static int fpga_suspend_noirq(struct device *dev) 122static int fpga_suspend_noirq(struct device *dev)
284{ 123{
285 __raw_writew(~0, &fpga->leds); 124 fpga_led_state = __raw_readw(&fpga->leds);
125 __raw_writew(0xff, &fpga->leds);
126
286 return 0; 127 return 0;
287} 128}
288 129
289static int fpga_resume_noirq(struct device *dev) 130static int fpga_resume_noirq(struct device *dev)
290{ 131{
291 __raw_writew(~hw_led_state, &fpga->leds); 132 __raw_writew(~fpga_led_state, &fpga->leds);
292 return 0; 133 return 0;
293} 134}
294 135
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-27 05:32:53 -0400