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994c84ea DB |
1 | /* |
2 | * linux/arch/arm/plat-omap/debug-leds.c | |
3 | * | |
dafbeadf | 4 | * Copyright 2011 by Bryan Wu <bryan.wu@canonical.com> |
994c84ea DB |
5 | * Copyright 2003 by Texas Instruments Incorporated |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
dafbeadf BW |
11 | |
12 | #include <linux/kernel.h> | |
994c84ea DB |
13 | #include <linux/init.h> |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/leds.h> | |
fced80c7 | 16 | #include <linux/io.h> |
4b25408f | 17 | #include <linux/platform_data/gpio-omap.h> |
dafbeadf | 18 | #include <linux/slab.h> |
994c84ea | 19 | |
994c84ea DB |
20 | #include <asm/mach-types.h> |
21 | ||
994c84ea DB |
22 | /* Many OMAP development platforms reuse the same "debug board"; these |
23 | * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the | |
24 | * debug board (all green), accessed through FPGA registers. | |
994c84ea DB |
25 | */ |
26 | ||
21d182bd TL |
27 | /* NOTE: most boards don't have a static mapping for the FPGA ... */ |
28 | struct h2p2_dbg_fpga { | |
29 | /* offset 0x00 */ | |
30 | u16 smc91x[8]; | |
31 | /* offset 0x10 */ | |
32 | u16 fpga_rev; | |
33 | u16 board_rev; | |
34 | u16 gpio_outputs; | |
35 | u16 leds; | |
36 | /* offset 0x18 */ | |
37 | u16 misc_inputs; | |
38 | u16 lan_status; | |
39 | u16 lan_reset; | |
40 | u16 reserved0; | |
41 | /* offset 0x20 */ | |
42 | u16 ps2_data; | |
43 | u16 ps2_ctrl; | |
44 | /* plus also 4 rs232 ports ... */ | |
45 | }; | |
46 | ||
dafbeadf | 47 | static struct h2p2_dbg_fpga __iomem *fpga; |
994c84ea | 48 | |
dafbeadf | 49 | static u16 fpga_led_state; |
994c84ea DB |
50 | |
51 | struct dbg_led { | |
52 | struct led_classdev cdev; | |
53 | u16 mask; | |
54 | }; | |
55 | ||
dafbeadf BW |
56 | static const struct { |
57 | const char *name; | |
58 | const char *trigger; | |
59 | } dbg_leds[] = { | |
60 | { "dbg:d4", "heartbeat", }, | |
61 | { "dbg:d5", "cpu0", }, | |
62 | { "dbg:d6", "default-on", }, | |
63 | { "dbg:d7", }, | |
64 | { "dbg:d8", }, | |
65 | { "dbg:d9", }, | |
66 | { "dbg:d10", }, | |
67 | { "dbg:d11", }, | |
68 | { "dbg:d12", }, | |
69 | { "dbg:d13", }, | |
70 | { "dbg:d14", }, | |
71 | { "dbg:d15", }, | |
72 | { "dbg:d16", }, | |
73 | { "dbg:d17", }, | |
74 | { "dbg:d18", }, | |
75 | { "dbg:d19", }, | |
994c84ea DB |
76 | }; |
77 | ||
dafbeadf BW |
78 | /* |
79 | * The triggers lines up below will only be used if the | |
80 | * LED triggers are compiled in. | |
81 | */ | |
82 | static void dbg_led_set(struct led_classdev *cdev, | |
83 | enum led_brightness b) | |
994c84ea | 84 | { |
dafbeadf BW |
85 | struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); |
86 | u16 reg; | |
994c84ea | 87 | |
dafbeadf BW |
88 | reg = __raw_readw(&fpga->leds); |
89 | if (b != LED_OFF) | |
90 | reg |= led->mask; | |
994c84ea | 91 | else |
dafbeadf BW |
92 | reg &= ~led->mask; |
93 | __raw_writew(reg, &fpga->leds); | |
994c84ea DB |
94 | } |
95 | ||
dafbeadf | 96 | static enum led_brightness dbg_led_get(struct led_classdev *cdev) |
994c84ea | 97 | { |
dafbeadf BW |
98 | struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); |
99 | u16 reg; | |
994c84ea | 100 | |
dafbeadf BW |
101 | reg = __raw_readw(&fpga->leds); |
102 | return (reg & led->mask) ? LED_FULL : LED_OFF; | |
994c84ea DB |
103 | } |
104 | ||
dafbeadf | 105 | static int fpga_probe(struct platform_device *pdev) |
994c84ea DB |
106 | { |
107 | struct resource *iomem; | |
dafbeadf | 108 | int i; |
994c84ea DB |
109 | |
110 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
111 | if (!iomem) | |
112 | return -ENODEV; | |
113 | ||
8de7e37e | 114 | fpga = ioremap(iomem->start, resource_size(iomem)); |
dafbeadf BW |
115 | __raw_writew(0xff, &fpga->leds); |
116 | ||
117 | for (i = 0; i < ARRAY_SIZE(dbg_leds); i++) { | |
118 | struct dbg_led *led; | |
119 | ||
120 | led = kzalloc(sizeof(*led), GFP_KERNEL); | |
121 | if (!led) | |
122 | break; | |
994c84ea | 123 | |
dafbeadf BW |
124 | led->cdev.name = dbg_leds[i].name; |
125 | led->cdev.brightness_set = dbg_led_set; | |
126 | led->cdev.brightness_get = dbg_led_get; | |
127 | led->cdev.default_trigger = dbg_leds[i].trigger; | |
128 | led->mask = BIT(i); | |
994c84ea | 129 | |
dafbeadf BW |
130 | if (led_classdev_register(NULL, &led->cdev) < 0) { |
131 | kfree(led); | |
132 | break; | |
133 | } | |
994c84ea DB |
134 | } |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
79ee031f | 139 | static int fpga_suspend_noirq(struct device *dev) |
994c84ea | 140 | { |
dafbeadf BW |
141 | fpga_led_state = __raw_readw(&fpga->leds); |
142 | __raw_writew(0xff, &fpga->leds); | |
143 | ||
994c84ea DB |
144 | return 0; |
145 | } | |
146 | ||
79ee031f | 147 | static int fpga_resume_noirq(struct device *dev) |
994c84ea | 148 | { |
dafbeadf | 149 | __raw_writew(~fpga_led_state, &fpga->leds); |
994c84ea DB |
150 | return 0; |
151 | } | |
152 | ||
47145210 | 153 | static const struct dev_pm_ops fpga_dev_pm_ops = { |
79ee031f MD |
154 | .suspend_noirq = fpga_suspend_noirq, |
155 | .resume_noirq = fpga_resume_noirq, | |
156 | }; | |
994c84ea DB |
157 | |
158 | static struct platform_driver led_driver = { | |
159 | .driver.name = "omap_dbg_led", | |
79ee031f | 160 | .driver.pm = &fpga_dev_pm_ops, |
994c84ea | 161 | .probe = fpga_probe, |
994c84ea DB |
162 | }; |
163 | ||
164 | static int __init fpga_init(void) | |
165 | { | |
166 | if (machine_is_omap_h4() | |
167 | || machine_is_omap_h3() | |
168 | || machine_is_omap_h2() | |
169 | || machine_is_omap_perseus2() | |
170 | ) | |
171 | return platform_driver_register(&led_driver); | |
172 | return 0; | |
173 | } | |
174 | fs_initcall(fpga_init); |