projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/sh/boards/se/7300/led.c | |
| 3 | * | |
| 4 | * Derived from linux/arch/sh/boards/se/770x/led.c | |
| 5 | * | |
| 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 Solution Engine specific LED code. | |
| 12 | */ | |
| 13 | ||
| 1da177e4 LT |
14 | #include <linux/sched.h> |
| 15 | #include <asm/mach/se7300.h> | |
| 16 | ||
| 17 | static void | |
| 18 | mach_led(int position, int value) | |
| 19 | { | |
| 20 | volatile unsigned short *p = (volatile unsigned short *) PA_LED; | |
| 21 | ||
| 22 | if (value) { | |
| 23 | *p |= (1 << 8); | |
| 24 | } else { | |
| 25 | *p &= ~(1 << 8); | |
| 26 | } | |
| 27 | } | |
| 28 | ||
| 29 | ||
| 30 | /* Cycle the LED's in the clasic Knightrider/Sun pattern */ | |
| 31 | void | |
| 32 | heartbeat_7300se(void) | |
| 33 | { | |
| 34 | static unsigned int cnt = 0, period = 0; | |
| 35 | volatile unsigned short *p = (volatile unsigned short *) PA_LED; | |
| 36 | static unsigned bit = 0, up = 1; | |
| 37 | ||
| 38 | cnt += 1; | |
| 39 | if (cnt < period) { | |
| 40 | return; | |
| 41 | } | |
| 42 | ||
| 43 | cnt = 0; | |
| 44 | ||
| 45 | /* Go through the points (roughly!): | |
| 46 | * f(0)=10, f(1)=16, f(2)=20, f(5)=35,f(inf)->110 | |
| 47 | */ | |
| 48 | period = 110 - ((300 << FSHIFT) / ((avenrun[0] / 5) + (3 << FSHIFT))); | |
| 49 | ||
| 50 | if (up) { | |
| 51 | if (bit == 7) { | |
| 52 | bit--; | |
| 53 | up = 0; | |
| 54 | } else { | |
| 55 | bit++; | |
| 56 | } | |
| 57 | } else { | |
| 58 | if (bit == 0) { | |
| 59 | bit++; | |
| 60 | up = 1; | |
| 61 | } else { | |
| 62 | bit--; | |
| 63 | } | |
| 64 | } | |
| 65 | *p = 1 << (bit + 8); | |
| 66 | ||
| 67 | } | |
| 68 |