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https://github.com/brain-hackers/u-boot-brain
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![wdenk](/assets/img/avatar_default.png)
- remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
212 lines
4.1 KiB
C
212 lines
4.1 KiB
C
/*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/i8254.h>
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#include <asm/ibmpc.h>
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static volatile unsigned long system_ticks;
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static int timer_init_done =0;
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static void timer_isr(void *unused)
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{
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system_ticks++;
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}
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unsigned long get_system_ticks(void)
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{
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return system_ticks;
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}
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#define TIMER0_VALUE 0x04aa /* 1kHz 1.9318MHz / 1000 */
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#define TIMER2_VALUE 0x0a8e /* 440Hz */
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int timer_init(void)
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{
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system_ticks = 0;
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irq_install_handler(0, timer_isr, NULL);
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/* initialize timer 0 and 2
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*
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* Timer 0 is used to increment system_tick 1000 times/sec
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* Timer 1 was used for DRAM refresh in early PC's
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* Timer 2 is used to drive the speaker
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* (to stasrt a beep: write 3 to port 0x61,
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* to stop it again: write 0)
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*/
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outb(PIT_CMD_CTR0|PIT_CMD_BOTH|PIT_CMD_MODE2, PIT_BASE + PIT_COMMAND);
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outb(TIMER0_VALUE&0xff, PIT_BASE + PIT_T0);
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outb(TIMER0_VALUE>>8, PIT_BASE + PIT_T0);
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outb(PIT_CMD_CTR2|PIT_CMD_BOTH|PIT_CMD_MODE3, PIT_BASE + PIT_COMMAND);
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outb(TIMER2_VALUE&0xff, PIT_BASE + PIT_T2);
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outb(TIMER2_VALUE>>8, PIT_BASE + PIT_T2);
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timer_init_done = 1;
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return 0;
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}
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#ifdef CFG_TIMER_GENERIC
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/* the unit for these is CFG_HZ */
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/* FixMe: implement these */
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void reset_timer (void)
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{
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system_ticks = 0;
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}
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ulong get_timer (ulong base)
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{
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return (system_ticks - base);
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}
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void set_timer (ulong t)
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{
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system_ticks = t;
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}
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static u16 read_pit(void)
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{
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u8 low;
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outb(PIT_CMD_LATCH, PIT_BASE + PIT_COMMAND);
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low = inb(PIT_BASE + PIT_T0);
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return ((inb(PIT_BASE + PIT_T0) << 8) | low);
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}
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/* this is not very exact */
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void udelay (unsigned long usec)
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{
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int counter;
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int wraps;
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if (!timer_init_done) {
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return;
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}
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counter = read_pit();
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wraps = usec/1000;
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usec = usec%1000;
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usec*=1194;
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usec/=1000;
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usec+=counter;
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if (usec > 1194) {
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usec-=1194;
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wraps++;
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}
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while (1) {
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int new_count = read_pit();
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if (((new_count < usec) && !wraps) || wraps < 0) {
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break;
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}
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if (new_count > counter) {
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wraps--;
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}
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counter = new_count;
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}
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}
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#if 0
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/* this is a version with debug output */
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void _udelay (unsigned long usec)
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{
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int counter;
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int wraps;
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int usec1, usec2, usec3;
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int wraps1, wraps2, wraps3, wraps4;
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int ctr1, ctr2, ctr3, nct1, nct2;
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int i;
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usec1=usec;
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if (!timer_init_done) {
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return;
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}
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counter = read_pit();
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ctr1 = counter;
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wraps = usec/1000;
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usec = usec%1000;
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usec2 = usec;
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wraps1 = wraps;
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usec*=1194;
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usec/=1000;
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usec+=counter;
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if (usec > 1194) {
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usec-=1194;
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wraps++;
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}
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usec3 = usec;
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wraps2 = wraps;
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ctr2 = wraps3 = nct1 = 4711;
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ctr3 = wraps4 = nct2 = 4711;
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i=0;
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while (1) {
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int new_count = read_pit();
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i++;
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if ((new_count < usec && !wraps) || wraps < 0) {
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break;
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}
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if (new_count > counter) {
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wraps--;
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}
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if (ctr2==4711) {
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ctr2 = counter;
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wraps3 = wraps;
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nct1 = new_count;
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} else {
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ctr3 = counter;
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wraps4 = wraps;
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nct2 = new_count;
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}
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counter = new_count;
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}
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printf("udelay(%d)\n", usec1);
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printf("counter %d\n", ctr1);
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printf("1: wraps %d, usec %d\n", wraps1, usec2);
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printf("2: wraps %d, usec %d\n", wraps2, usec3);
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printf("new_count[0] %d counter %d wraps %d\n", nct1, ctr2, wraps3);
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printf("new_count[%d] %d counter %d wraps %d\n", i, nct2, ctr3, wraps4);
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printf("%d %d %d %d %d\n",
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read_pit(), read_pit(), read_pit(),
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read_pit(), read_pit());
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}
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#endif
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#endif
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