| Greg Ungerer | 75003c4 | 2005-09-09 09:32:14 +1000 | [diff] [blame^] | 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 | |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <asm/setup.h> |
| 22 | #include <asm/system.h> |
| 23 | #include <asm/pgtable.h> |
| 24 | #include <asm/irq.h> |
| 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 | |
| 56 | void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *)) |
| 57 | { |
| 58 | /* disable timer 1 */ |
| 59 | TCTL = 0; |
| 60 | |
| 61 | /* set ISR */ |
| 62 | if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL)) |
| 63 | panic("Unable to attach timer interrupt\n"); |
| 64 | |
| 65 | /* Restart mode, Enable int, Set clock source */ |
| 66 | TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; |
| 67 | TPRER = CLOCK_PRE; |
| 68 | TCMP = TICKS_PER_JIFFY; |
| 69 | |
| 70 | /* Enable timer 1 */ |
| 71 | TCTL |= TCTL_TEN; |
| 72 | } |
| 73 | |
| 74 | /***************************************************************************/ |
| 75 | |
| 76 | void m68328_timer_tick(void) |
| 77 | { |
| 78 | /* Reset Timer1 */ |
| 79 | TSTAT &= 0; |
| 80 | } |
| 81 | /***************************************************************************/ |
| 82 | |
| 83 | unsigned long m68328_timer_gettimeoffset(void) |
| 84 | { |
| 85 | unsigned long ticks = TCN, offset = 0; |
| 86 | |
| 87 | /* check for pending interrupt */ |
| 88 | if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM))) |
| 89 | offset = 1000000 / HZ; |
| 90 | ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY; |
| 91 | return ticks + offset; |
| 92 | } |
| 93 | |
| 94 | /***************************************************************************/ |
| 95 | |
| 96 | void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec) |
| 97 | { |
| 98 | long now = RTCTIME; |
| 99 | |
| 100 | *year = *mon = *day = 1; |
| 101 | *hour = (now >> 24) % 24; |
| 102 | *min = (now >> 16) % 60; |
| 103 | *sec = now % 60; |
| 104 | } |
| 105 | |
| 106 | /***************************************************************************/ |