arm/mach-footbridge/ebsa285.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * linux/arch/arm/mach-footbridge/ebsa285.c
0004  *
0005  * EBSA285 machine fixup
0006  */
0007 #include <linux/init.h>
0008 #include <linux/io.h>
0009 #include <linux/spinlock.h>
0010 #include <linux/slab.h>
0011 #include <linux/leds.h>
0012
0013 #include <asm/hardware/dec21285.h>
0014 #include <asm/mach-types.h>
0015
0016 #include <asm/mach/arch.h>
0017
0018 #include "common.h"
0019
0020 /* LEDs */
0021 #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
0022 #define XBUS_AMBER_L    BIT(0)
0023 #define XBUS_GREEN_L    BIT(1)
0024 #define XBUS_RED_L  BIT(2)
0025 #define XBUS_TOGGLE BIT(7)
0026
0027 struct ebsa285_led {
0028     struct led_classdev     cdev;
0029     u8                      mask;
0030 };
0031
0032 /*
0033  * The triggers lines up below will only be used if the
0034  * LED triggers are compiled in.
0035  */
0036 static const struct {
0037     const char *name;
0038     const char *trigger;
0039 } ebsa285_leds[] = {
0040     { "ebsa285:amber", "cpu0", },
0041     { "ebsa285:green", "heartbeat", },
0042     { "ebsa285:red",},
0043 };
0044
0045 static unsigned char hw_led_state;
0046 static void __iomem *xbus;
0047
0048 static void ebsa285_led_set(struct led_classdev *cdev,
0049         enum led_brightness b)
0050 {
0051     struct ebsa285_led *led = container_of(cdev,
0052             struct ebsa285_led, cdev);
0053
0054     if (b == LED_OFF)
0055         hw_led_state |= led->mask;
0056     else
0057         hw_led_state &= ~led->mask;
0058     writeb(hw_led_state, xbus);
0059 }
0060
0061 static enum led_brightness ebsa285_led_get(struct led_classdev *cdev)
0062 {
0063     struct ebsa285_led *led = container_of(cdev,
0064             struct ebsa285_led, cdev);
0065
0066     return hw_led_state & led->mask ? LED_OFF : LED_FULL;
0067 }
0068
0069 static int __init ebsa285_leds_init(void)
0070 {
0071     int i;
0072
0073     if (!machine_is_ebsa285())
0074         return -ENODEV;
0075
0076     xbus = ioremap(XBUS_CS2, SZ_4K);
0077     if (!xbus)
0078         return -ENOMEM;
0079
0080     /* 3 LEDS all off */
0081     hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L;
0082     writeb(hw_led_state, xbus);
0083
0084     for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
0085         struct ebsa285_led *led;
0086
0087         led = kzalloc(sizeof(*led), GFP_KERNEL);
0088         if (!led)
0089             break;
0090
0091         led->cdev.name = ebsa285_leds[i].name;
0092         led->cdev.brightness_set = ebsa285_led_set;
0093         led->cdev.brightness_get = ebsa285_led_get;
0094         led->cdev.default_trigger = ebsa285_leds[i].trigger;
0095         led->mask = BIT(i);
0096
0097         if (led_classdev_register(NULL, &led->cdev) < 0) {
0098             kfree(led);
0099             break;
0100         }
0101     }
0102
0103     return 0;
0104 }
0105
0106 /*
0107  * Since we may have triggers on any subsystem, defer registration
0108  * until after subsystem_init.
0109  */
0110 fs_initcall(ebsa285_leds_init);
0111 #endif
0112
0113 MACHINE_START(EBSA285, "EBSA285")
0114     /* Maintainer: Russell King */
0115     .atag_offset    = 0x100,
0116     .video_start    = 0x000a0000,
0117     .video_end  = 0x000bffff,
0118     .map_io     = footbridge_map_io,
0119     .init_early = footbridge_sched_clock,
0120     .init_irq   = footbridge_init_irq,
0121     .init_time  = footbridge_timer_init,
0122     .restart    = footbridge_restart,
0123 MACHINE_END
0124