Merge tag 'v3.15-rc1' into perf/urgent
[sfrench/cifs-2.6.git] / arch / arm / mach-footbridge / ebsa285.c
1 /*
2  * linux/arch/arm/mach-footbridge/ebsa285.c
3  *
4  * EBSA285 machine fixup
5  */
6 #include <linux/init.h>
7 #include <linux/io.h>
8 #include <linux/spinlock.h>
9 #include <linux/slab.h>
10 #include <linux/leds.h>
11
12 #include <asm/hardware/dec21285.h>
13 #include <asm/mach-types.h>
14
15 #include <asm/mach/arch.h>
16
17 #include "common.h"
18
19 /* LEDs */
20 #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
21 #define XBUS_AMBER_L    BIT(0)
22 #define XBUS_GREEN_L    BIT(1)
23 #define XBUS_RED_L      BIT(2)
24 #define XBUS_TOGGLE     BIT(7)
25
26 struct ebsa285_led {
27         struct led_classdev     cdev;
28         u8                      mask;
29 };
30
31 /*
32  * The triggers lines up below will only be used if the
33  * LED triggers are compiled in.
34  */
35 static const struct {
36         const char *name;
37         const char *trigger;
38 } ebsa285_leds[] = {
39         { "ebsa285:amber", "cpu0", },
40         { "ebsa285:green", "heartbeat", },
41         { "ebsa285:red",},
42 };
43
44 static unsigned char hw_led_state;
45 static void __iomem *xbus;
46
47 static void ebsa285_led_set(struct led_classdev *cdev,
48                 enum led_brightness b)
49 {
50         struct ebsa285_led *led = container_of(cdev,
51                         struct ebsa285_led, cdev);
52
53         if (b == LED_OFF)
54                 hw_led_state |= led->mask;
55         else
56                 hw_led_state &= ~led->mask;
57         writeb(hw_led_state, xbus);
58 }
59
60 static enum led_brightness ebsa285_led_get(struct led_classdev *cdev)
61 {
62         struct ebsa285_led *led = container_of(cdev,
63                         struct ebsa285_led, cdev);
64
65         return hw_led_state & led->mask ? LED_OFF : LED_FULL;
66 }
67
68 static int __init ebsa285_leds_init(void)
69 {
70         int i;
71
72         if (!machine_is_ebsa285())
73                 return -ENODEV;
74
75         xbus = ioremap(XBUS_CS2, SZ_4K);
76         if (!xbus)
77                 return -ENOMEM;
78
79         /* 3 LEDS all off */
80         hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L;
81         writeb(hw_led_state, xbus);
82
83         for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
84                 struct ebsa285_led *led;
85
86                 led = kzalloc(sizeof(*led), GFP_KERNEL);
87                 if (!led)
88                         break;
89
90                 led->cdev.name = ebsa285_leds[i].name;
91                 led->cdev.brightness_set = ebsa285_led_set;
92                 led->cdev.brightness_get = ebsa285_led_get;
93                 led->cdev.default_trigger = ebsa285_leds[i].trigger;
94                 led->mask = BIT(i);
95
96                 if (led_classdev_register(NULL, &led->cdev) < 0) {
97                         kfree(led);
98                         break;
99                 }
100         }
101
102         return 0;
103 }
104
105 /*
106  * Since we may have triggers on any subsystem, defer registration
107  * until after subsystem_init.
108  */
109 fs_initcall(ebsa285_leds_init);
110 #endif
111
112 MACHINE_START(EBSA285, "EBSA285")
113         /* Maintainer: Russell King */
114         .atag_offset    = 0x100,
115         .video_start    = 0x000a0000,
116         .video_end      = 0x000bffff,
117         .map_io         = footbridge_map_io,
118         .init_early     = footbridge_sched_clock,
119         .init_irq       = footbridge_init_irq,
120         .init_time      = footbridge_timer_init,
121         .restart        = footbridge_restart,
122 MACHINE_END
123