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1 | /* |
2 | * linux/arch/m68k/hp300/time.c | |
3 | * | |
4 | * Copyright (C) 1998 Philip Blundell <philb@gnu.org> | |
5 | * | |
6 | * This file contains the HP300-specific time handling code. | |
7 | */ | |
8 | ||
9 | #include <asm/ptrace.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <asm/machdep.h> | |
16 | #include <asm/irq.h> | |
17 | #include <asm/io.h> | |
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18 | #include <asm/traps.h> |
19 | #include <asm/blinken.h> | |
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20 | |
21 | /* Clock hardware definitions */ | |
22 | ||
23 | #define CLOCKBASE 0xf05f8000 | |
24 | ||
25 | #define CLKCR1 0x1 | |
26 | #define CLKCR2 0x3 | |
27 | #define CLKCR3 CLKCR1 | |
28 | #define CLKSR CLKCR2 | |
29 | #define CLKMSB1 0x5 | |
30 | #define CLKMSB2 0x9 | |
31 | #define CLKMSB3 0xD | |
32 | ||
33 | /* This is for machines which generate the exact clock. */ | |
34 | #define USECS_PER_JIFFY (1000000/HZ) | |
35 | ||
36 | #define INTVAL ((10000 / 4) - 1) | |
37 | ||
2850bc27 | 38 | static irqreturn_t hp300_tick(int irq, void *dev_id) |
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39 | { |
40 | unsigned long tmp; | |
40220c1a | 41 | irq_handler_t vector = dev_id; |
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42 | in_8(CLOCKBASE + CLKSR); |
43 | asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE)); | |
44 | /* Turn off the network and SCSI leds */ | |
45 | blinken_leds(0, 0xe0); | |
2850bc27 | 46 | return vector(irq, NULL); |
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47 | } |
48 | ||
49 | unsigned long hp300_gettimeoffset(void) | |
50 | { | |
51 | /* Read current timer 1 value */ | |
52 | unsigned char lsb, msb1, msb2; | |
53 | unsigned short ticks; | |
54 | ||
55 | msb1 = in_8(CLOCKBASE + 5); | |
56 | lsb = in_8(CLOCKBASE + 7); | |
57 | msb2 = in_8(CLOCKBASE + 5); | |
58 | if (msb1 != msb2) | |
59 | /* A carry happened while we were reading. Read it again */ | |
60 | lsb = in_8(CLOCKBASE + 7); | |
61 | ticks = INTVAL - ((msb2 << 8) | lsb); | |
62 | return (USECS_PER_JIFFY * ticks) / INTVAL; | |
63 | } | |
64 | ||
40220c1a | 65 | void __init hp300_sched_init(irq_handler_t vector) |
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66 | { |
67 | out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */ | |
68 | out_8(CLOCKBASE + CLKCR1, 0x1); /* reset */ | |
69 | ||
70 | asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE)); | |
71 | ||
5a239453 | 72 | if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector)) |
8bd3968b | 73 | pr_err("Couldn't register timer interrupt\n"); |
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74 | |
75 | out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */ | |
76 | out_8(CLOCKBASE + CLKCR1, 0x40); /* enable irq */ | |
77 | } |