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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 | /** @addtogroup ia32 |
29 | /** @addtogroup ia32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** |
32 | /** |
33 | * @file |
33 | * @file |
34 | * @brief i8254 chip driver. |
34 | * @brief i8254 chip driver. |
35 | * |
35 | * |
36 | * Low level time functions. |
36 | * Low level time functions. |
37 | */ |
37 | */ |
38 | 38 | ||
39 | #include <arch/types.h> |
39 | #include <arch/types.h> |
40 | #include <time/clock.h> |
40 | #include <time/clock.h> |
41 | #include <time/delay.h> |
41 | #include <time/delay.h> |
- | 42 | #include <arch/cycle.h> |
|
42 | #include <arch/interrupt.h> |
43 | #include <arch/interrupt.h> |
43 | #include <arch/drivers/i8259.h> |
44 | #include <arch/drivers/i8259.h> |
44 | #include <arch/drivers/i8254.h> |
45 | #include <arch/drivers/i8254.h> |
45 | #include <cpu.h> |
46 | #include <cpu.h> |
46 | #include <config.h> |
47 | #include <config.h> |
47 | #include <arch/pm.h> |
48 | #include <arch/pm.h> |
48 | #include <arch/asm.h> |
49 | #include <arch/asm.h> |
49 | #include <arch/cpuid.h> |
50 | #include <arch/cpuid.h> |
50 | #include <arch.h> |
51 | #include <arch.h> |
51 | #include <time/delay.h> |
52 | #include <time/delay.h> |
52 | #include <ddi/irq.h> |
53 | #include <ddi/irq.h> |
53 | #include <ddi/device.h> |
54 | #include <ddi/device.h> |
54 | 55 | ||
55 | #define CLK_PORT1 0x40 |
56 | #define CLK_PORT1 0x40 |
56 | #define CLK_PORT4 0x43 |
57 | #define CLK_PORT4 0x43 |
57 | 58 | ||
58 | #define CLK_CONST 1193180 |
59 | #define CLK_CONST 1193180 |
59 | #define MAGIC_NUMBER 1194 |
60 | #define MAGIC_NUMBER 1194 |
60 | 61 | ||
61 | static irq_t i8254_irq; |
62 | static irq_t i8254_irq; |
62 | 63 | ||
63 | static irq_ownership_t i8254_claim(void) |
64 | static irq_ownership_t i8254_claim(void) |
64 | { |
65 | { |
65 | return IRQ_ACCEPT; |
66 | return IRQ_ACCEPT; |
66 | } |
67 | } |
67 | 68 | ||
68 | static void i8254_irq_handler(irq_t *irq, void *arg, ...) |
69 | static void i8254_irq_handler(irq_t *irq, void *arg, ...) |
69 | { |
70 | { |
70 | clock(); |
71 | clock(); |
71 | } |
72 | } |
72 | 73 | ||
73 | void i8254_init(void) |
74 | void i8254_init(void) |
74 | { |
75 | { |
75 | irq_initialize(&i8254_irq); |
76 | irq_initialize(&i8254_irq); |
76 | i8254_irq.devno = device_assign_devno(); |
77 | i8254_irq.devno = device_assign_devno(); |
77 | i8254_irq.inr = IRQ_CLK; |
78 | i8254_irq.inr = IRQ_CLK; |
78 | i8254_irq.claim = i8254_claim; |
79 | i8254_irq.claim = i8254_claim; |
79 | i8254_irq.handler = i8254_irq_handler; |
80 | i8254_irq.handler = i8254_irq_handler; |
80 | irq_register(&i8254_irq); |
81 | irq_register(&i8254_irq); |
81 | 82 | ||
82 | i8254_normal_operation(); |
83 | i8254_normal_operation(); |
83 | } |
84 | } |
84 | 85 | ||
85 | void i8254_normal_operation(void) |
86 | void i8254_normal_operation(void) |
86 | { |
87 | { |
87 | outb(CLK_PORT4, 0x36); |
88 | outb(CLK_PORT4, 0x36); |
88 | pic_disable_irqs(1 << IRQ_CLK); |
89 | pic_disable_irqs(1 << IRQ_CLK); |
89 | outb(CLK_PORT1, (CLK_CONST / HZ) & 0xf); |
90 | outb(CLK_PORT1, (CLK_CONST / HZ) & 0xf); |
90 | outb(CLK_PORT1, (CLK_CONST / HZ) >> 8); |
91 | outb(CLK_PORT1, (CLK_CONST / HZ) >> 8); |
91 | pic_enable_irqs(1 << IRQ_CLK); |
92 | pic_enable_irqs(1 << IRQ_CLK); |
92 | } |
93 | } |
93 | 94 | ||
94 | #define LOOPS 150000 |
95 | #define LOOPS 150000 |
95 | #define SHIFT 11 |
96 | #define SHIFT 11 |
96 | void i8254_calibrate_delay_loop(void) |
97 | void i8254_calibrate_delay_loop(void) |
97 | { |
98 | { |
98 | uint64_t clk1, clk2; |
99 | uint64_t clk1, clk2; |
99 | uint32_t t1, t2, o1, o2; |
100 | uint32_t t1, t2, o1, o2; |
100 | uint8_t not_ok; |
101 | uint8_t not_ok; |
101 | 102 | ||
102 | 103 | ||
103 | /* |
104 | /* |
104 | * One-shot timer. Count-down from 0xffff at 1193180Hz |
105 | * One-shot timer. Count-down from 0xffff at 1193180Hz |
105 | * MAGIC_NUMBER is the magic value for 1ms. |
106 | * MAGIC_NUMBER is the magic value for 1ms. |
106 | */ |
107 | */ |
107 | outb(CLK_PORT4, 0x30); |
108 | outb(CLK_PORT4, 0x30); |
108 | outb(CLK_PORT1, 0xff); |
109 | outb(CLK_PORT1, 0xff); |
109 | outb(CLK_PORT1, 0xff); |
110 | outb(CLK_PORT1, 0xff); |
110 | 111 | ||
111 | do { |
112 | do { |
112 | /* will read both status and count */ |
113 | /* will read both status and count */ |
113 | outb(CLK_PORT4, 0xc2); |
114 | outb(CLK_PORT4, 0xc2); |
114 | not_ok = (inb(CLK_PORT1)>>6)&1; |
115 | not_ok = (inb(CLK_PORT1)>>6)&1; |
115 | t1 = inb(CLK_PORT1); |
116 | t1 = inb(CLK_PORT1); |
116 | t1 |= inb(CLK_PORT1) << 8; |
117 | t1 |= inb(CLK_PORT1) << 8; |
117 | } while (not_ok); |
118 | } while (not_ok); |
118 | 119 | ||
119 | asm_delay_loop(LOOPS); |
120 | asm_delay_loop(LOOPS); |
120 | 121 | ||
121 | outb(CLK_PORT4, 0xd2); |
122 | outb(CLK_PORT4, 0xd2); |
122 | t2 = inb(CLK_PORT1); |
123 | t2 = inb(CLK_PORT1); |
123 | t2 |= inb(CLK_PORT1) << 8; |
124 | t2 |= inb(CLK_PORT1) << 8; |
124 | 125 | ||
125 | /* |
126 | /* |
126 | * We want to determine the overhead of the calibrating mechanism. |
127 | * We want to determine the overhead of the calibrating mechanism. |
127 | */ |
128 | */ |
128 | outb(CLK_PORT4, 0xd2); |
129 | outb(CLK_PORT4, 0xd2); |
129 | o1 = inb(CLK_PORT1); |
130 | o1 = inb(CLK_PORT1); |
130 | o1 |= inb(CLK_PORT1) << 8; |
131 | o1 |= inb(CLK_PORT1) << 8; |
131 | 132 | ||
132 | asm_fake_loop(LOOPS); |
133 | asm_fake_loop(LOOPS); |
133 | 134 | ||
134 | outb(CLK_PORT4, 0xd2); |
135 | outb(CLK_PORT4, 0xd2); |
135 | o2 = inb(CLK_PORT1); |
136 | o2 = inb(CLK_PORT1); |
136 | o2 |= inb(CLK_PORT1) << 8; |
137 | o2 |= inb(CLK_PORT1) << 8; |
137 | 138 | ||
138 | CPU->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0); |
139 | CPU->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0); |
139 | 140 | ||
140 | clk1 = rdtsc(); |
141 | clk1 = get_cycle(); |
141 | delay(1<<SHIFT); |
142 | delay(1 << SHIFT); |
142 | clk2 = rdtsc(); |
143 | clk2 = get_cycle(); |
143 | 144 | ||
144 | CPU->frequency_mhz = (clk2-clk1)>>SHIFT; |
145 | CPU->frequency_mhz = (clk2 - clk1) >> SHIFT; |
145 | 146 | ||
146 | return; |
147 | return; |
147 | } |
148 | } |
148 | 149 | ||
149 | /** @} |
150 | /** @} |
150 | */ |
151 | */ |
151 | 152 |