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