projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 75003c48 GU |
1 | /***************************************************************************/ |
| 2 | ||
| 3 | /* | |
| 4 | * linux/arch/m68knommu/platform/68328/timers.c | |
| 5 | * | |
| 6 | * Copyright (C) 1993 Hamish Macdonald | |
| 7 | * Copyright (C) 1999 D. Jeff Dionne | |
| 8 | * Copyright (C) 2001 Georges Menie, Ken Desmet | |
| 9 | * | |
| 10 | * This file is subject to the terms and conditions of the GNU General Public | |
| 11 | * License. See the file COPYING in the main directory of this archive | |
| 12 | * for more details. | |
| 13 | */ | |
| 14 | ||
| 15 | /***************************************************************************/ | |
| 16 | ||
| 75003c48 GU |
17 | #include <linux/types.h> |
| 18 | #include <linux/kernel.h> | |
| 19 | #include <linux/mm.h> | |
| 1ea9acc7 | 20 | #include <linux/interrupt.h> |
| be03e56b | 21 | #include <linux/irq.h> |
| 75003c48 GU |
22 | #include <asm/setup.h> |
| 23 | #include <asm/system.h> | |
| 24 | #include <asm/pgtable.h> | |
| 75003c48 GU |
25 | #include <asm/machdep.h> |
| 26 | #include <asm/MC68VZ328.h> | |
| 27 | ||
| 28 | /***************************************************************************/ | |
| 29 | ||
| 30 | #if defined(CONFIG_DRAGEN2) | |
| 31 | /* with a 33.16 MHz clock, this will give usec resolution to the time functions */ | |
| 32 | #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK | |
| 33 | #define CLOCK_PRE 7 | |
| 34 | #define TICKS_PER_JIFFY 41450 | |
| 35 | ||
| 36 | #elif defined(CONFIG_XCOPILOT_BUGS) | |
| 37 | /* | |
| 38 | * The only thing I know is that CLK32 is not available on Xcopilot | |
| 39 | * I have little idea about what frequency SYSCLK has on Xcopilot. | |
| 40 | * The values for prescaler and compare registers were simply | |
| 41 | * taken from the original source | |
| 42 | */ | |
| 43 | #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK | |
| 44 | #define CLOCK_PRE 2 | |
| 45 | #define TICKS_PER_JIFFY 0xd7e4 | |
| 46 | ||
| 47 | #else | |
| 48 | /* default to using the 32Khz clock */ | |
| 49 | #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ | |
| 50 | #define CLOCK_PRE 31 | |
| 51 | #define TICKS_PER_JIFFY 10 | |
| 52 | #endif | |
| 53 | ||
| 54 | /***************************************************************************/ | |
| 55 | ||
| 84675716 GU |
56 | static irqreturn_t hw_tick(int irq, void *dummy) |
| 57 | { | |
| 58 | /* Reset Timer1 */ | |
| 59 | TSTAT &= 0; | |
| 60 | ||
| 61 | return arch_timer_interrupt(irq, dummy); | |
| 62 | } | |
| 63 | ||
| 64 | /***************************************************************************/ | |
| 65 | ||
| be03e56b | 66 | static struct irqaction m68328_timer_irq = { |
| 84675716 GU |
67 | .name = "timer", |
| 68 | .flags = IRQF_DISABLED | IRQF_TIMER, | |
| 69 | .handler = hw_tick, | |
| be03e56b GU |
70 | }; |
| 71 | ||
| 84675716 | 72 | void hw_timer_init(void) |
| 75003c48 GU |
73 | { |
| 74 | /* disable timer 1 */ | |
| 75 | TCTL = 0; | |
| 76 | ||
| 77 | /* set ISR */ | |
| be03e56b | 78 | setup_irq(TMR_IRQ_NUM, &m68328_timer_irq); |
| 75003c48 GU |
79 | |
| 80 | /* Restart mode, Enable int, Set clock source */ | |
| 81 | TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; | |
| 82 | TPRER = CLOCK_PRE; | |
| 83 | TCMP = TICKS_PER_JIFFY; | |
| 84 | ||
| 85 | /* Enable timer 1 */ | |
| 86 | TCTL |= TCTL_TEN; | |
| 87 | } | |
| 88 | ||
| 89 | /***************************************************************************/ | |
| 90 | ||
| 84675716 | 91 | unsigned long hw_timer_offset(void) |
| 75003c48 GU |
92 | { |
| 93 | unsigned long ticks = TCN, offset = 0; | |
| 94 | ||
| 95 | /* check for pending interrupt */ | |
| 96 | if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM))) | |
| 97 | offset = 1000000 / HZ; | |
| 98 | ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY; | |
| 99 | return ticks + offset; | |
| 100 | } | |
| 101 | ||
| 102 | /***************************************************************************/ | |
| 103 | ||
| 104 | void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec) | |
| 105 | { | |
| 106 | long now = RTCTIME; | |
| 107 | ||
| 108 | *year = *mon = *day = 1; | |
| 109 | *hour = (now >> 24) % 24; | |
| 110 | *min = (now >> 16) % 60; | |
| 111 | *sec = now % 60; | |
| 112 | } | |
| 113 | ||
| 114 | /***************************************************************************/ |