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leds.c
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1 /* ASB2305 Peripheral 7-segment LEDs x4 support
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 #include <linux/kernel.h>
12 #include <linux/param.h>
13 #include <linux/init.h>
14 #include <asm/io.h>
15 #include <asm/processor.h>
16 #include <asm/intctl-regs.h>
17 #include <asm/rtc-regs.h>
18 #include <unit/leds.h>
19 
20 static const u8 asb2305_led_hex_tbl[16] = {
21  0x80, 0xf2, 0x48, 0x60, 0x32, 0x24, 0x04, 0xf0,
22  0x00, 0x20, 0x10, 0x06, 0x8c, 0x42, 0x0c, 0x1c
23 };
24 
25 static const u32 asb2305_led_chase_tbl[6] = {
26  ~0x02020202, /* top - segA */
27  ~0x04040404, /* right top - segB */
28  ~0x08080808, /* right bottom - segC */
29  ~0x10101010, /* bottom - segD */
30  ~0x20202020, /* left bottom - segE */
31  ~0x40404040, /* left top - segF */
32 };
33 
34 static unsigned asb2305_led_chase;
35 
36 void peripheral_leds7x4_display_dec(unsigned int val, unsigned int points)
37 {
38  u32 leds;
39 
40  leds = asb2305_led_hex_tbl[(val/1000) % 10];
41  leds <<= 8;
42  leds |= asb2305_led_hex_tbl[(val/100) % 10];
43  leds <<= 8;
44  leds |= asb2305_led_hex_tbl[(val/10) % 10];
45  leds <<= 8;
46  leds |= asb2305_led_hex_tbl[val % 10];
47  leds |= points^0x01010101;
48 
49  ASB2305_7SEGLEDS = leds;
50 }
51 
52 void peripheral_leds7x4_display_hex(unsigned int val, unsigned int points)
53 {
54  u32 leds;
55 
56  leds = asb2305_led_hex_tbl[(val/1000) % 10];
57  leds <<= 8;
58  leds |= asb2305_led_hex_tbl[(val/100) % 10];
59  leds <<= 8;
60  leds |= asb2305_led_hex_tbl[(val/10) % 10];
61  leds <<= 8;
62  leds |= asb2305_led_hex_tbl[val % 10];
63  leds |= points^0x01010101;
64 
65  ASB2305_7SEGLEDS = leds;
66 }
67 
68 void peripheral_leds_display_exception(enum exception_code code)
69 {
70  u32 leds;
71 
72  leds = asb2305_led_hex_tbl[(code/0x100) % 0x10];
73  leds <<= 8;
74  leds |= asb2305_led_hex_tbl[(code/0x10) % 0x10];
75  leds <<= 8;
76  leds |= asb2305_led_hex_tbl[code % 0x10];
77  leds |= 0x6d010101;
78 
79  ASB2305_7SEGLEDS = leds;
80 }
81 
82 void peripheral_leds7x4_display_minssecs(unsigned int time, unsigned int points)
83 {
84  u32 leds;
85 
86  leds = asb2305_led_hex_tbl[(time/600) % 6];
87  leds <<= 8;
88  leds |= asb2305_led_hex_tbl[(time/60) % 10];
89  leds <<= 8;
90  leds |= asb2305_led_hex_tbl[(time/10) % 6];
91  leds <<= 8;
92  leds |= asb2305_led_hex_tbl[time % 10];
93  leds |= points^0x01010101;
94 
95  ASB2305_7SEGLEDS = leds;
96 }
97 
98 void peripheral_leds7x4_display_rtc(void)
99 {
100  unsigned int clock;
101  u8 mins, secs;
102 
103  mins = RTMCR;
104  secs = RTSCR;
105 
106  clock = ((mins & 0xf0) >> 4);
107  clock *= 10;
108  clock += (mins & 0x0f);
109  clock *= 6;
110 
111  clock += ((secs & 0xf0) >> 4);
112  clock *= 10;
113  clock += (secs & 0x0f);
114 
115  peripheral_leds7x4_display_minssecs(clock, 0);
116 }
117 
118 void peripheral_leds_led_chase(void)
119 {
120  ASB2305_7SEGLEDS = asb2305_led_chase_tbl[asb2305_led_chase];
121  asb2305_led_chase++;
122  if (asb2305_led_chase >= 6)
123  asb2305_led_chase = 0;
124 }
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