GNU Linux-libre 4.19.264-gnu1
[releases.git] / arch / arm / mach-footbridge / ebsa285.c
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(hw_led_state, 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(XBUS_CS2, 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(hw_led_state, xbus);
83
84         for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
85                 struct ebsa285_led *led;
86
87                 led = kzalloc(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) < 0) {
98                         kfree(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