1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/arch/arm/mach-footbridge/ebsa285.c |
4 | * |
5 | * EBSA285 machine fixup |
6 | */ |
7 | #include <linux/init.h> |
8 | #include <linux/io.h> |
9 | #include <linux/spinlock.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/leds.h> |
12 | |
13 | #include <asm/hardware/dec21285.h> |
14 | #include <asm/mach-types.h> |
15 | |
16 | #include <asm/mach/arch.h> |
17 | |
18 | #include "common.h" |
19 | |
20 | /* LEDs */ |
21 | #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS) |
22 | #define XBUS_AMBER_L BIT(0) |
23 | #define XBUS_GREEN_L BIT(1) |
24 | #define XBUS_RED_L BIT(2) |
25 | #define XBUS_TOGGLE BIT(7) |
26 | |
27 | struct ebsa285_led { |
28 | struct led_classdev cdev; |
29 | u8 mask; |
30 | }; |
31 | |
32 | /* |
33 | * The triggers lines up below will only be used if the |
34 | * LED triggers are compiled in. |
35 | */ |
36 | static const struct { |
37 | const char *name; |
38 | const char *trigger; |
39 | } ebsa285_leds[] = { |
40 | { "ebsa285:amber" , "cpu0" , }, |
41 | { "ebsa285:green" , "heartbeat" , }, |
42 | { "ebsa285:red" ,}, |
43 | }; |
44 | |
45 | static unsigned char hw_led_state; |
46 | static void __iomem *xbus; |
47 | |
48 | static void ebsa285_led_set(struct led_classdev *cdev, |
49 | enum led_brightness b) |
50 | { |
51 | struct ebsa285_led *led = container_of(cdev, |
52 | struct ebsa285_led, cdev); |
53 | |
54 | if (b == LED_OFF) |
55 | hw_led_state |= led->mask; |
56 | else |
57 | hw_led_state &= ~led->mask; |
58 | writeb(val: hw_led_state, addr: xbus); |
59 | } |
60 | |
61 | static enum led_brightness ebsa285_led_get(struct led_classdev *cdev) |
62 | { |
63 | struct ebsa285_led *led = container_of(cdev, |
64 | struct ebsa285_led, cdev); |
65 | |
66 | return hw_led_state & led->mask ? LED_OFF : LED_FULL; |
67 | } |
68 | |
69 | static int __init ebsa285_leds_init(void) |
70 | { |
71 | int i; |
72 | |
73 | if (!machine_is_ebsa285()) |
74 | return -ENODEV; |
75 | |
76 | xbus = ioremap(offset: XBUS_CS2, size: SZ_4K); |
77 | if (!xbus) |
78 | return -ENOMEM; |
79 | |
80 | /* 3 LEDS all off */ |
81 | hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L; |
82 | writeb(val: hw_led_state, addr: xbus); |
83 | |
84 | for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) { |
85 | struct ebsa285_led *led; |
86 | |
87 | led = kzalloc(size: sizeof(*led), GFP_KERNEL); |
88 | if (!led) |
89 | break; |
90 | |
91 | led->cdev.name = ebsa285_leds[i].name; |
92 | led->cdev.brightness_set = ebsa285_led_set; |
93 | led->cdev.brightness_get = ebsa285_led_get; |
94 | led->cdev.default_trigger = ebsa285_leds[i].trigger; |
95 | led->mask = BIT(i); |
96 | |
97 | if (led_classdev_register(NULL, led_cdev: &led->cdev) < 0) { |
98 | kfree(objp: led); |
99 | break; |
100 | } |
101 | } |
102 | |
103 | return 0; |
104 | } |
105 | |
106 | /* |
107 | * Since we may have triggers on any subsystem, defer registration |
108 | * until after subsystem_init. |
109 | */ |
110 | fs_initcall(ebsa285_leds_init); |
111 | #endif |
112 | |
113 | MACHINE_START(EBSA285, "EBSA285" ) |
114 | /* Maintainer: Russell King */ |
115 | .atag_offset = 0x100, |
116 | .video_start = 0x000a0000, |
117 | .video_end = 0x000bffff, |
118 | .map_io = footbridge_map_io, |
119 | .init_early = footbridge_sched_clock, |
120 | .init_irq = footbridge_init_irq, |
121 | .init_time = footbridge_timer_init, |
122 | .restart = footbridge_restart, |
123 | MACHINE_END |
124 | |
125 | |