Rev 1 | Rev 125 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 1 | Rev 15 | ||
---|---|---|---|
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.h> |
39 | #include <arch.h> |
40 | 40 | ||
41 | /* |
41 | /* |
42 | * i8254 chip driver. |
42 | * i8254 chip driver. |
43 | * Low level time functions. |
43 | * Low level time functions. |
44 | */ |
44 | */ |
45 | 45 | ||
46 | #define CLK_PORT1 0x40 |
46 | #define CLK_PORT1 0x40 |
47 | #define CLK_PORT4 0x43 |
47 | #define CLK_PORT4 0x43 |
48 | 48 | ||
49 | 49 | ||
50 | #define CLK_CONST 1193180 |
50 | #define CLK_CONST 1193180 |
51 | #define MAGIC_NUMBER 1194 |
51 | #define MAGIC_NUMBER 1194 |
52 | 52 | ||
53 | void i8254_init(void) |
53 | void i8254_init(void) |
54 | { |
54 | { |
55 | i8254_normal_operation(); |
55 | i8254_normal_operation(); |
56 | } |
56 | } |
57 | 57 | ||
58 | void i8254_normal_operation(void) |
58 | void i8254_normal_operation(void) |
59 | { |
59 | { |
60 | outb(CLK_PORT4, 0x36); |
60 | outb(CLK_PORT4, 0x36); |
61 | trap_virtual_disable_irqs(1<<IRQ_CLK); |
61 | trap_virtual_disable_irqs(1<<IRQ_CLK); |
62 | outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf); |
62 | outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf); |
63 | outb(CLK_PORT1, (CLK_CONST/HZ) >> 8); |
63 | outb(CLK_PORT1, (CLK_CONST/HZ) >> 8); |
64 | trap_virtual_enable_irqs(1<<IRQ_CLK); |
64 | trap_virtual_enable_irqs(1<<IRQ_CLK); |
65 | trap_register(VECTOR_CLK, i8254_interrupt); |
65 | trap_register(VECTOR_CLK, i8254_interrupt); |
66 | } |
66 | } |
67 | 67 | ||
68 | #define LOOPS 150000 |
68 | #define LOOPS 150000 |
69 | #define SHIFT 11 |
69 | #define SHIFT 11 |
70 | void i8254_calibrate_delay_loop(void) |
70 | void i8254_calibrate_delay_loop(void) |
71 | { |
71 | { |
72 | __u64 clk1, clk2; |
72 | __u64 clk1, clk2; |
73 | __u32 t1, t2, o1, o2; |
73 | __u32 t1, t2, o1, o2; |
74 | __u8 not_ok; |
74 | __u8 not_ok; |
75 | 75 | ||
76 | 76 | ||
77 | /* |
77 | /* |
78 | * One-shot timer. Count-down from 0xffff at 1193180Hz |
78 | * One-shot timer. Count-down from 0xffff at 1193180Hz |
79 | * MAGIC_NUMBER is the magic value for 1ms. |
79 | * MAGIC_NUMBER is the magic value for 1ms. |
80 | */ |
80 | */ |
81 | outb(CLK_PORT4, 0x30); |
81 | outb(CLK_PORT4, 0x30); |
82 | outb(CLK_PORT1, 0xff); |
82 | outb(CLK_PORT1, 0xff); |
83 | outb(CLK_PORT1, 0xff); |
83 | outb(CLK_PORT1, 0xff); |
84 | 84 | ||
85 | do { |
85 | do { |
86 | /* will read both status and count */ |
86 | /* will read both status and count */ |
87 | outb(CLK_PORT4, 0xc2); |
87 | outb(CLK_PORT4, 0xc2); |
88 | not_ok = (inb(CLK_PORT1)>>6)&1; |
88 | not_ok = (inb(CLK_PORT1)>>6)&1; |
89 | t1 = inb(CLK_PORT1); |
89 | t1 = inb(CLK_PORT1); |
90 | t1 |= inb(CLK_PORT1) << 8; |
90 | t1 |= inb(CLK_PORT1) << 8; |
91 | } while (not_ok); |
91 | } while (not_ok); |
92 | 92 | ||
93 | asm_delay_loop(LOOPS); |
93 | asm_delay_loop(LOOPS); |
94 | 94 | ||
95 | outb(CLK_PORT4, 0xd2); |
95 | outb(CLK_PORT4, 0xd2); |
96 | t2 = inb(CLK_PORT1); |
96 | t2 = inb(CLK_PORT1); |
97 | t2 |= inb(CLK_PORT1) << 8; |
97 | t2 |= inb(CLK_PORT1) << 8; |
98 | 98 | ||
99 | /* |
99 | /* |
100 | * We want to determine the overhead of the calibrating mechanism. |
100 | * We want to determine the overhead of the calibrating mechanism. |
101 | */ |
101 | */ |
102 | outb(CLK_PORT4, 0xd2); |
102 | outb(CLK_PORT4, 0xd2); |
103 | o1 = inb(CLK_PORT1); |
103 | o1 = inb(CLK_PORT1); |
104 | o1 |= inb(CLK_PORT1) << 8; |
104 | o1 |= inb(CLK_PORT1) << 8; |
105 | 105 | ||
106 | asm_fake_loop(LOOPS); |
106 | asm_fake_loop(LOOPS); |
107 | 107 | ||
108 | outb(CLK_PORT4, 0xd2); |
108 | outb(CLK_PORT4, 0xd2); |
109 | o2 = inb(CLK_PORT1); |
109 | o2 = inb(CLK_PORT1); |
110 | o2 |= inb(CLK_PORT1) << 8; |
110 | o2 |= inb(CLK_PORT1) << 8; |
111 | 111 | ||
112 | 112 | ||
113 | the->cpu->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + |
113 | CPU->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + |
114 | (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0); |
114 | (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0); |
115 | 115 | ||
116 | 116 | ||
117 | clk1 = rdtsc(); |
117 | clk1 = rdtsc(); |
118 | delay(1<<SHIFT); |
118 | delay(1<<SHIFT); |
119 | clk2 = rdtsc(); |
119 | clk2 = rdtsc(); |
120 | 120 | ||
121 | the->cpu->frequency_mhz = (clk2-clk1)>>SHIFT; |
121 | CPU->frequency_mhz = (clk2-clk1)>>SHIFT; |
122 | 122 | ||
123 | return; |
123 | return; |
124 | } |
124 | } |
125 | 125 | ||
126 | void i8254_interrupt(__u8 n, __u32 stack[]) |
126 | void i8254_interrupt(__u8 n, __u32 stack[]) |
127 | { |
127 | { |
128 | trap_virtual_eoi(); |
128 | trap_virtual_eoi(); |
129 | clock(); |
129 | clock(); |
130 | } |
130 | } |
131 | 131 |