1 /*
2 * linux/arch/arm/mach-omap1/leds-h2p2-debug.c
3 *
4 * Copyright 2003 by Texas Instruments Incorporated
5 *
6 * There are 16 LEDs on the debug board (all green); four may be used
7 * for logical 'green', 'amber', 'red', and 'blue' (after "claiming").
8 *
9 * The "surfer" expansion board and H2 sample board also have two-color
10 * green+red LEDs (in parallel), used here for timer and idle indicators.
11 */
12 #include <linux/gpio.h>
13 #include <linux/init.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/sched.h>
16 #include <linux/io.h>
17
18 #include <mach/hardware.h>
19 #include <asm/leds.h>
20 #include <asm/system.h>
21 #include <asm/mach-types.h>
22
23 #include <plat/fpga.h>
24
25 #include "leds.h"
26
27
28 #define GPIO_LED_RED 3
29 #define GPIO_LED_GREEN OMAP_MPUIO(4)
30
31
32 #define LED_STATE_ENABLED 0x01
33 #define LED_STATE_CLAIMED 0x02
34 #define LED_TIMER_ON 0x04
35
36 #define GPIO_IDLE GPIO_LED_GREEN
37 #define GPIO_TIMER GPIO_LED_RED
38
39
h2p2_dbg_leds_event(led_event_t evt)40 void h2p2_dbg_leds_event(led_event_t evt)
41 {
42 unsigned long flags;
43
44 static struct h2p2_dbg_fpga __iomem *fpga;
45 static u16 led_state, hw_led_state;
46
47 local_irq_save(flags);
48
49 if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
50 goto done;
51
52 switch (evt) {
53 case led_start:
54 if (!fpga)
55 fpga = ioremap(H2P2_DBG_FPGA_START,
56 H2P2_DBG_FPGA_SIZE);
57 if (fpga) {
58 led_state |= LED_STATE_ENABLED;
59 __raw_writew(~0, &fpga->leds);
60 }
61 break;
62
63 case led_stop:
64 case led_halted:
65 /* all leds off during suspend or shutdown */
66
67 if (! machine_is_omap_perseus2()) {
68 gpio_set_value(GPIO_TIMER, 0);
69 gpio_set_value(GPIO_IDLE, 0);
70 }
71
72 __raw_writew(~0, &fpga->leds);
73 led_state &= ~LED_STATE_ENABLED;
74 if (evt == led_halted) {
75 iounmap(fpga);
76 fpga = NULL;
77 }
78
79 goto done;
80
81 case led_claim:
82 led_state |= LED_STATE_CLAIMED;
83 hw_led_state = 0;
84 break;
85
86 case led_release:
87 led_state &= ~LED_STATE_CLAIMED;
88 break;
89
90 #ifdef CONFIG_LEDS_TIMER
91 case led_timer:
92 led_state ^= LED_TIMER_ON;
93
94 if (machine_is_omap_perseus2())
95 hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
96 else {
97 gpio_set_value(GPIO_TIMER, led_state & LED_TIMER_ON);
98 goto done;
99 }
100
101 break;
102 #endif
103
104 #ifdef CONFIG_LEDS_CPU
105 case led_idle_start:
106 if (machine_is_omap_perseus2())
107 hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
108 else {
109 gpio_set_value(GPIO_IDLE, 1);
110 goto done;
111 }
112
113 break;
114
115 case led_idle_end:
116 if (machine_is_omap_perseus2())
117 hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
118 else {
119 gpio_set_value(GPIO_IDLE, 0);
120 goto done;
121 }
122
123 break;
124 #endif
125
126 case led_green_on:
127 hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
128 break;
129 case led_green_off:
130 hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
131 break;
132
133 case led_amber_on:
134 hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
135 break;
136 case led_amber_off:
137 hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
138 break;
139
140 case led_red_on:
141 hw_led_state |= H2P2_DBG_FPGA_LED_RED;
142 break;
143 case led_red_off:
144 hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
145 break;
146
147 case led_blue_on:
148 hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
149 break;
150 case led_blue_off:
151 hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
152 break;
153
154 default:
155 break;
156 }
157
158
159 /*
160 * Actually burn the LEDs
161 */
162 if (led_state & LED_STATE_ENABLED)
163 __raw_writew(~hw_led_state, &fpga->leds);
164
165 done:
166 local_irq_restore(flags);
167 }
168