Rev 534 | Rev 1477 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <arch/types.h> |
||
| 30 | #include <time/clock.h> |
||
| 31 | #include <time/delay.h> |
||
| 32 | #include <arch/interrupt.h> |
||
| 33 | #include <arch/i8259.h> |
||
| 34 | #include <arch/i8254.h> |
||
| 35 | #include <cpu.h> |
||
| 36 | #include <config.h> |
||
| 37 | #include <arch/pm.h> |
||
| 38 | #include <arch/asm.h> |
||
| 195 | vana | 39 | #include <arch/cpuid.h> |
| 1 | jermar | 40 | #include <arch.h> |
| 195 | vana | 41 | #include <time/delay.h> |
| 576 | palkovsky | 42 | #include <interrupt.h> |
| 1 | jermar | 43 | |
| 44 | /* |
||
| 45 | * i8254 chip driver. |
||
| 46 | * Low level time functions. |
||
| 47 | */ |
||
| 48 | |||
| 49 | #define CLK_PORT1 0x40 |
||
| 50 | #define CLK_PORT4 0x43 |
||
| 51 | |||
| 52 | |||
| 53 | #define CLK_CONST 1193180 |
||
| 54 | #define MAGIC_NUMBER 1194 |
||
| 55 | |||
| 576 | palkovsky | 56 | static void i8254_interrupt(int n, void *stack); |
| 57 | |||
| 1 | jermar | 58 | void i8254_init(void) |
| 59 | { |
||
| 60 | i8254_normal_operation(); |
||
| 61 | } |
||
| 62 | |||
| 63 | void i8254_normal_operation(void) |
||
| 64 | { |
||
| 65 | outb(CLK_PORT4, 0x36); |
||
| 514 | jermar | 66 | pic_disable_irqs(1<<IRQ_CLK); |
| 1 | jermar | 67 | outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf); |
| 68 | outb(CLK_PORT1, (CLK_CONST/HZ) >> 8); |
||
| 514 | jermar | 69 | pic_enable_irqs(1<<IRQ_CLK); |
| 576 | palkovsky | 70 | exc_register(VECTOR_CLK, "i8254_clock", i8254_interrupt); |
| 1 | jermar | 71 | } |
| 72 | |||
| 73 | #define LOOPS 150000 |
||
| 74 | #define SHIFT 11 |
||
| 75 | void i8254_calibrate_delay_loop(void) |
||
| 76 | { |
||
| 77 | __u64 clk1, clk2; |
||
| 78 | __u32 t1, t2, o1, o2; |
||
| 79 | __u8 not_ok; |
||
| 80 | |||
| 81 | |||
| 82 | /* |
||
| 83 | * One-shot timer. Count-down from 0xffff at 1193180Hz |
||
| 84 | * MAGIC_NUMBER is the magic value for 1ms. |
||
| 85 | */ |
||
| 86 | outb(CLK_PORT4, 0x30); |
||
| 87 | outb(CLK_PORT1, 0xff); |
||
| 88 | outb(CLK_PORT1, 0xff); |
||
| 89 | |||
| 90 | do { |
||
| 125 | jermar | 91 | /* will read both status and count */ |
| 1 | jermar | 92 | outb(CLK_PORT4, 0xc2); |
| 93 | not_ok = (inb(CLK_PORT1)>>6)&1; |
||
| 94 | t1 = inb(CLK_PORT1); |
||
| 95 | t1 |= inb(CLK_PORT1) << 8; |
||
| 96 | } while (not_ok); |
||
| 97 | |||
| 98 | asm_delay_loop(LOOPS); |
||
| 99 | |||
| 100 | outb(CLK_PORT4, 0xd2); |
||
| 101 | t2 = inb(CLK_PORT1); |
||
| 102 | t2 |= inb(CLK_PORT1) << 8; |
||
| 103 | |||
| 104 | /* |
||
| 105 | * We want to determine the overhead of the calibrating mechanism. |
||
| 106 | */ |
||
| 107 | outb(CLK_PORT4, 0xd2); |
||
| 108 | o1 = inb(CLK_PORT1); |
||
| 109 | o1 |= inb(CLK_PORT1) << 8; |
||
| 110 | |||
| 111 | asm_fake_loop(LOOPS); |
||
| 112 | |||
| 113 | outb(CLK_PORT4, 0xd2); |
||
| 114 | o2 = inb(CLK_PORT1); |
||
| 115 | o2 |= inb(CLK_PORT1) << 8; |
||
| 116 | |||
| 125 | jermar | 117 | CPU->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0); |
| 1 | jermar | 118 | |
| 119 | clk1 = rdtsc(); |
||
| 120 | delay(1<<SHIFT); |
||
| 121 | clk2 = rdtsc(); |
||
| 122 | |||
| 15 | jermar | 123 | CPU->frequency_mhz = (clk2-clk1)>>SHIFT; |
| 1 | jermar | 124 | |
| 125 | return; |
||
| 126 | } |
||
| 127 | |||
| 576 | palkovsky | 128 | void i8254_interrupt(int n, void *stack) |
| 1 | jermar | 129 | { |
| 130 | trap_virtual_eoi(); |
||
| 131 | clock(); |
||
| 132 | } |