| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/sh/kernel/led_microdev.c |
| 3 | * |
| 4 | * Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com> |
| 5 | * Copyright (C) 2003 Richard Curnow (Richard.Curnow@superh.com) |
| 6 | * |
| 7 | * May be copied or modified under the terms of the GNU General Public |
| 8 | * License. See linux/COPYING for more information. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <asm/io.h> |
| 14 | |
| 15 | #define LED_REGISTER 0xa6104d20 |
| 16 | |
| 17 | static void mach_led_d9(int value) |
| 18 | { |
| 19 | unsigned long reg; |
| 20 | reg = ctrl_inl(LED_REGISTER); |
| 21 | reg &= ~1; |
| 22 | reg |= (value & 1); |
| 23 | ctrl_outl(reg, LED_REGISTER); |
| 24 | return; |
| 25 | } |
| 26 | |
| 27 | static void mach_led_d10(int value) |
| 28 | { |
| 29 | unsigned long reg; |
| 30 | reg = ctrl_inl(LED_REGISTER); |
| 31 | reg &= ~2; |
| 32 | reg |= ((value & 1) << 1); |
| 33 | ctrl_outl(reg, LED_REGISTER); |
| 34 | return; |
| 35 | } |
| 36 | |
| 37 | |
| 38 | #ifdef CONFIG_HEARTBEAT |
| 39 | #include <linux/sched.h> |
| 40 | |
| 41 | static unsigned char banner_table[] = { |
| 42 | 0x11, 0x01, 0x11, 0x01, 0x11, 0x03, |
| 43 | 0x11, 0x01, 0x11, 0x01, 0x13, 0x03, |
| 44 | 0x11, 0x01, 0x13, 0x01, 0x13, 0x01, 0x11, 0x03, |
| 45 | 0x11, 0x03, |
| 46 | 0x11, 0x01, 0x13, 0x01, 0x11, 0x03, |
| 47 | 0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x11, 0x07, |
| 48 | 0x13, 0x01, 0x13, 0x03, |
| 49 | 0x11, 0x01, 0x11, 0x03, |
| 50 | 0x13, 0x01, 0x11, 0x01, 0x13, 0x01, 0x11, 0x03, |
| 51 | 0x11, 0x01, 0x13, 0x01, 0x11, 0x03, |
| 52 | 0x13, 0x01, 0x13, 0x01, 0x13, 0x03, |
| 53 | 0x13, 0x01, 0x11, 0x01, 0x11, 0x03, |
| 54 | 0x11, 0x03, |
| 55 | 0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x13, 0x07, |
| 56 | 0xff |
| 57 | }; |
| 58 | |
| 59 | static void banner(void) |
| 60 | { |
| 61 | static int pos = 0; |
| 62 | static int count = 0; |
| 63 | |
| 64 | if (count) { |
| 65 | count--; |
| 66 | } else { |
| 67 | int val = banner_table[pos]; |
| 68 | if (val == 0xff) { |
| 69 | pos = 0; |
| 70 | val = banner_table[pos]; |
| 71 | } |
| 72 | pos++; |
| 73 | mach_led_d10((val >> 4) & 1); |
| 74 | count = 10 * (val & 0xf); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* From heartbeat_harp in the stboards directory */ |
| 79 | /* acts like an actual heart beat -- ie thump-thump-pause... */ |
| 80 | void microdev_heartbeat(void) |
| 81 | { |
| 82 | static unsigned cnt = 0, period = 0, dist = 0; |
| 83 | |
| 84 | if (cnt == 0 || cnt == dist) |
| 85 | mach_led_d9(1); |
| 86 | else if (cnt == 7 || cnt == dist+7) |
| 87 | mach_led_d9(0); |
| 88 | |
| 89 | if (++cnt > period) { |
| 90 | cnt = 0; |
| 91 | /* The hyperbolic function below modifies the heartbeat period |
| 92 | * length in dependency of the current (5min) load. It goes |
| 93 | * through the points f(0)=126, f(1)=86, f(5)=51, |
| 94 | * f(inf)->30. */ |
| 95 | period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; |
| 96 | dist = period / 4; |
| 97 | } |
| 98 | |
| 99 | banner(); |
| 100 | } |
| 101 | |
| 102 | #endif |