projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| f30c2269 | 2 | * linux/arch/sh/boards/bigsur/led.c |
| 1da177e4 LT |
3 | * |
| 4 | * By Dustin McIntire (dustin@sensoria.com) (c)2001 | |
| 5 | * Derived from led_se.c and led.c, which bore the message: | |
| 6 | * Copyright (C) 2000 Stuart Menefy <stuart.menefy@st.com> | |
| 7 | * | |
| 8 | * May be copied or modified under the terms of the GNU General Public | |
| 9 | * License. See linux/COPYING for more information. | |
| 10 | * | |
| 11 | * This file contains Big Sur specific LED code. | |
| 12 | */ | |
| 13 | ||
| 1da177e4 LT |
14 | #include <asm/io.h> |
| 15 | #include <asm/bigsur/bigsur.h> | |
| 16 | ||
| 17 | static void mach_led(int position, int value) | |
| 18 | { | |
| 19 | int word; | |
| 20 | ||
| 21 | word = bigsur_inl(BIGSUR_CSLR); | |
| 22 | if (value) { | |
| 23 | bigsur_outl(word & ~BIGSUR_LED, BIGSUR_CSLR); | |
| 24 | } else { | |
| 25 | bigsur_outl(word | BIGSUR_LED, BIGSUR_CSLR); | |
| 26 | } | |
| 27 | } | |
| 28 | ||
| 29 | #ifdef CONFIG_HEARTBEAT | |
| 30 | ||
| 31 | #include <linux/sched.h> | |
| 32 | ||
| 33 | /* Cycle the LED on/off */ | |
| 34 | void heartbeat_bigsur(void) | |
| 35 | { | |
| 36 | static unsigned cnt = 0, period = 0, dist = 0; | |
| 37 | ||
| 38 | if (cnt == 0 || cnt == dist) | |
| 39 | mach_led( -1, 1); | |
| 40 | else if (cnt == 7 || cnt == dist+7) | |
| 41 | mach_led( -1, 0); | |
| 42 | ||
| 43 | if (++cnt > period) { | |
| 44 | cnt = 0; | |
| 45 | /* The hyperbolic function below modifies the heartbeat period | |
| 46 | * length in dependency of the current (5min) load. It goes | |
| 47 | * through the points f(0)=126, f(1)=86, f(5)=51, | |
| 48 | * f(inf)->30. */ | |
| 49 | period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; | |
| 50 | dist = period / 4; | |
| 51 | } | |
| 52 | } | |
| 53 | #endif /* CONFIG_HEARTBEAT */ | |
| 54 |