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-rw-r--r--arch/arm/plat-omap/debug-leds.c294
1 files changed, 68 insertions, 226 deletions
diff --git a/arch/arm/plat-omap/debug-leds.c b/arch/arm/plat-omap/debug-leds.c
index 39407cbe34c..ea29bbe8e5c 100644
--- a/arch/arm/plat-omap/debug-leds.c
+++ b/arch/arm/plat-omap/debug-leds.c
@@ -1,279 +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>
17#include <linux/platform_data/gpio-omap.h>
18#include <linux/slab.h>
15 19
16#include <mach/hardware.h> 20#include <mach/hardware.h>
17#include <asm/leds.h>
18#include <asm/mach-types.h> 21#include <asm/mach-types.h>
19 22
20#include <plat/fpga.h> 23#include <plat/fpga.h>
21 24
22
23/* Many OMAP development platforms reuse the same "debug board"; these 25/* Many OMAP development platforms reuse the same "debug board"; these
24 * 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
25 * debug board (all green), accessed through FPGA registers. 27 * debug board (all green), accessed through FPGA registers.
26 *
27 * The "surfer" expansion board and H2 sample board also have two-color
28 * green+red LEDs (in parallel), used here for timer and idle indicators
29 * in preference to the ones on the debug board, for a "Disco LED" effect.
30 *
31 * This driver exports either the original ARM LED API, the new generic
32 * one, or both.
33 */
34
35static spinlock_t lock;
36static struct h2p2_dbg_fpga __iomem *fpga;
37static u16 led_state, hw_led_state;
38
39
40#ifdef CONFIG_OMAP_DEBUG_LEDS
41#define new_led_api() 1
42#else
43#define new_led_api() 0
44#endif
45
46
47/*-------------------------------------------------------------------------*/
48
49/* original ARM debug LED API:
50 * - timer and idle leds (some boards use non-FPGA leds here);
51 * - up to 4 generic leds, easily accessed in-kernel (any context)
52 */ 28 */
53 29
54#define GPIO_LED_RED 3 30static struct h2p2_dbg_fpga __iomem *fpga;
55#define GPIO_LED_GREEN OMAP_MPUIO(4)
56
57#define LED_STATE_ENABLED 0x01
58#define LED_STATE_CLAIMED 0x02
59#define LED_TIMER_ON 0x04
60
61#define GPIO_IDLE GPIO_LED_GREEN
62#define GPIO_TIMER GPIO_LED_RED
63
64static void h2p2_dbg_leds_event(led_event_t evt)
65{
66 unsigned long flags;
67
68 spin_lock_irqsave(&lock, flags);
69
70 if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
71 goto done;
72
73 switch (evt) {
74 case led_start:
75 if (fpga)
76 led_state |= LED_STATE_ENABLED;
77 break;
78
79 case led_stop:
80 case led_halted:
81 /* all leds off during suspend or shutdown */
82
83 if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
84 gpio_set_value(GPIO_TIMER, 0);
85 gpio_set_value(GPIO_IDLE, 0);
86 }
87
88 __raw_writew(~0, &fpga->leds);
89 led_state &= ~LED_STATE_ENABLED;
90 goto done;
91
92 case led_claim:
93 led_state |= LED_STATE_CLAIMED;
94 hw_led_state = 0;
95 break;
96
97 case led_release:
98 led_state &= ~LED_STATE_CLAIMED;
99 break;
100
101#ifdef CONFIG_LEDS_TIMER
102 case led_timer:
103 led_state ^= LED_TIMER_ON;
104
105 if (machine_is_omap_perseus2() || machine_is_omap_h4())
106 hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
107 else {
108 gpio_set_value(GPIO_TIMER,
109 led_state & LED_TIMER_ON);
110 goto done;
111 }
112
113 break;
114#endif
115
116#ifdef CONFIG_LEDS_CPU
117 /* LED lit iff busy */
118 case led_idle_start:
119 if (machine_is_omap_perseus2() || machine_is_omap_h4())
120 hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
121 else {
122 gpio_set_value(GPIO_IDLE, 1);
123 goto done;
124 }
125
126 break;
127 31
128 case led_idle_end: 32static u16 fpga_led_state;
129 if (machine_is_omap_perseus2() || machine_is_omap_h4())
130 hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
131 else {
132 gpio_set_value(GPIO_IDLE, 0);
133 goto done;
134 }
135
136 break;
137#endif
138
139 case led_green_on:
140 hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
141 break;
142 case led_green_off:
143 hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
144 break;
145
146 case led_amber_on:
147 hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
148 break;
149 case led_amber_off:
150 hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
151 break;
152
153 case led_red_on:
154 hw_led_state |= H2P2_DBG_FPGA_LED_RED;
155 break;
156 case led_red_off:
157 hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
158 break;
159
160 case led_blue_on:
161 hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
162 break;
163 case led_blue_off:
164 hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
165 break;
166
167 default:
168 break;
169 }
170
171
172 /*
173 * Actually burn the LEDs
174 */
175 if (led_state & LED_STATE_ENABLED)
176 __raw_writew(~hw_led_state, &fpga->leds);
177
178done:
179 spin_unlock_irqrestore(&lock, flags);
180}
181
182/*-------------------------------------------------------------------------*/
183
184/* "new" LED API
185 * - with syfs access and generic triggering
186 * - not readily accessible to in-kernel drivers
187 */
188 33
189struct dbg_led { 34struct dbg_led {
190 struct led_classdev cdev; 35 struct led_classdev cdev;
191 u16 mask; 36 u16 mask;
192}; 37};
193 38
194static struct dbg_led dbg_leds[] = { 39static const struct {
195 /* REVISIT at least H2 uses different timer & cpu leds... */ 40 const char *name;
196#ifndef CONFIG_LEDS_TIMER 41 const char *trigger;
197 { .mask = 1 << 0, .cdev.name = "d4:green", 42} dbg_leds[] = {
198 .cdev.default_trigger = "heartbeat", }, 43 { "dbg:d4", "heartbeat", },
199#endif 44 { "dbg:d5", "cpu0", },
200#ifndef CONFIG_LEDS_CPU 45 { "dbg:d6", "default-on", },
201 { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */ 46 { "dbg:d7", },
202#endif 47 { "dbg:d8", },
203 { .mask = 1 << 2, .cdev.name = "d6:green", }, 48 { "dbg:d9", },
204 { .mask = 1 << 3, .cdev.name = "d7:green", }, 49 { "dbg:d10", },
205 50 { "dbg:d11", },
206 { .mask = 1 << 4, .cdev.name = "d8:green", }, 51 { "dbg:d12", },
207 { .mask = 1 << 5, .cdev.name = "d9:green", }, 52 { "dbg:d13", },
208 { .mask = 1 << 6, .cdev.name = "d10:green", }, 53 { "dbg:d14", },
209 { .mask = 1 << 7, .cdev.name = "d11:green", }, 54 { "dbg:d15", },
210 55 { "dbg:d16", },
211 { .mask = 1 << 8, .cdev.name = "d12:green", }, 56 { "dbg:d17", },
212 { .mask = 1 << 9, .cdev.name = "d13:green", }, 57 { "dbg:d18", },
213 { .mask = 1 << 10, .cdev.name = "d14:green", }, 58 { "dbg:d19", },
214 { .mask = 1 << 11, .cdev.name = "d15:green", },
215
216#ifndef CONFIG_LEDS
217 { .mask = 1 << 12, .cdev.name = "d16:green", },
218 { .mask = 1 << 13, .cdev.name = "d17:green", },
219 { .mask = 1 << 14, .cdev.name = "d18:green", },
220 { .mask = 1 << 15, .cdev.name = "d19:green", },
221#endif
222}; 59};
223 60
224static void 61/*
225fpga_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)
226{ 67{
227 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); 68 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
228 unsigned long flags; 69 u16 reg;
229 70
230 spin_lock_irqsave(&lock, flags); 71 reg = __raw_readw(&fpga->leds);
231 if (value == LED_OFF) 72 if (b != LED_OFF)
232 hw_led_state &= ~led->mask; 73 reg |= led->mask;
233 else 74 else
234 hw_led_state |= led->mask; 75 reg &= ~led->mask;
235 __raw_writew(~hw_led_state, &fpga->leds); 76 __raw_writew(reg, &fpga->leds);
236 spin_unlock_irqrestore(&lock, flags);
237} 77}
238 78
239static void __init newled_init(struct device *dev) 79static enum led_brightness dbg_led_get(struct led_classdev *cdev)
240{ 80{
241 unsigned i; 81 struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
242 struct dbg_led *led; 82 u16 reg;
243 int status;
244 83
245 for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) { 84 reg = __raw_readw(&fpga->leds);
246 led->cdev.brightness_set = fpga_led_set; 85 return (reg & led->mask) ? LED_FULL : LED_OFF;
247 status = led_classdev_register(dev, &led->cdev);
248 if (status < 0)
249 break;
250 }
251 return;
252} 86}
253 87
254 88static int fpga_probe(struct platform_device *pdev)
255/*-------------------------------------------------------------------------*/
256
257static int /* __init */ fpga_probe(struct platform_device *pdev)
258{ 89{
259 struct resource *iomem; 90 struct resource *iomem;
260 91 int i;
261 spin_lock_init(&lock);
262 92
263 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 93 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
264 if (!iomem) 94 if (!iomem)
265 return -ENODEV; 95 return -ENODEV;
266 96
267 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE); 97 fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
268 __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;
269 106
270#ifdef CONFIG_LEDS 107 led->cdev.name = dbg_leds[i].name;
271 leds_event = h2p2_dbg_leds_event; 108 led->cdev.brightness_set = dbg_led_set;
272 leds_event(led_start); 109 led->cdev.brightness_get = dbg_led_get;
273#endif 110 led->cdev.default_trigger = dbg_leds[i].trigger;
111 led->mask = BIT(i);
274 112
275 if (new_led_api()) { 113 if (led_classdev_register(NULL, &led->cdev) < 0) {
276 newled_init(&pdev->dev); 114 kfree(led);
115 break;
116 }
277 } 117 }
278 118
279 return 0; 119 return 0;
@@ -281,13 +121,15 @@ static int /* __init */ fpga_probe(struct platform_device *pdev)
281 121
282static int fpga_suspend_noirq(struct device *dev) 122static int fpga_suspend_noirq(struct device *dev)
283{ 123{
284 __raw_writew(~0, &fpga->leds); 124 fpga_led_state = __raw_readw(&fpga->leds);
125 __raw_writew(0xff, &fpga->leds);
126
285 return 0; 127 return 0;
286} 128}
287 129
288static int fpga_resume_noirq(struct device *dev) 130static int fpga_resume_noirq(struct device *dev)
289{ 131{
290 __raw_writew(~hw_led_state, &fpga->leds); 132 __raw_writew(~fpga_led_state, &fpga->leds);
291 return 0; 133 return 0;
292} 134}
293 135
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-21 07:42:45 -0400