projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/mach-clps711x/time.c | |
| 3 | * | |
| 4 | * Copyright (C) 2001 Deep Blue Solutions Ltd. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | */ | |
| 19 | #include <linux/timex.h> | |
| 20 | #include <linux/init.h> | |
| 21 | #include <linux/interrupt.h> | |
| 6f77dde8 | 22 | #include <linux/irq.h> |
| 1da177e4 LT |
23 | #include <linux/sched.h> |
| 24 | ||
| 25 | #include <asm/hardware.h> | |
| 26 | #include <asm/irq.h> | |
| 27 | #include <asm/leds.h> | |
| 28 | #include <asm/io.h> | |
| 29 | #include <asm/hardware/clps7111.h> | |
| 30 | ||
| 31 | #include <asm/mach/time.h> | |
| 32 | ||
| 33 | ||
| 34 | /* | |
| 35 | * gettimeoffset() returns time since last timer tick, in usecs. | |
| 36 | * | |
| 37 | * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy. | |
| 38 | * 'tick' is usecs per jiffy. | |
| 39 | */ | |
| 40 | static unsigned long clps711x_gettimeoffset(void) | |
| 41 | { | |
| 42 | unsigned long hwticks; | |
| 43 | hwticks = LATCH - (clps_readl(TC2D) & 0xffff); /* since last underflow */ | |
| 44 | return (hwticks * (tick_nsec / 1000)) / LATCH; | |
| 45 | } | |
| 46 | ||
| 47 | /* | |
| 48 | * IRQ handler for the timer | |
| 49 | */ | |
| 50 | static irqreturn_t | |
| 0cd61b68 | 51 | p720t_timer_interrupt(int irq, void *dev_id) |
| 1da177e4 LT |
52 | { |
| 53 | write_seqlock(&xtime_lock); | |
| 0cd61b68 | 54 | timer_tick(); |
| 1da177e4 LT |
55 | write_sequnlock(&xtime_lock); |
| 56 | return IRQ_HANDLED; | |
| 57 | } | |
| 58 | ||
| 59 | static struct irqaction clps711x_timer_irq = { | |
| 60 | .name = "CLPS711x Timer Tick", | |
| 52e405ea | 61 | .flags = IRQF_DISABLED | IRQF_TIMER, |
| 09b8b5f8 | 62 | .handler = p720t_timer_interrupt, |
| 1da177e4 LT |
63 | }; |
| 64 | ||
| 65 | static void __init clps711x_timer_init(void) | |
| 66 | { | |
| 67 | struct timespec tv; | |
| 68 | unsigned int syscon; | |
| 69 | ||
| 70 | syscon = clps_readl(SYSCON1); | |
| 71 | syscon |= SYSCON1_TC2S | SYSCON1_TC2M; | |
| 72 | clps_writel(syscon, SYSCON1); | |
| 73 | ||
| 74 | clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */ | |
| 75 | ||
| 76 | setup_irq(IRQ_TC2OI, &clps711x_timer_irq); | |
| 77 | ||
| 78 | tv.tv_nsec = 0; | |
| 79 | tv.tv_sec = clps_readl(RTCDR); | |
| 80 | do_settimeofday(&tv); | |
| 81 | } | |
| 82 | ||
| 83 | struct sys_timer clps711x_timer = { | |
| 84 | .init = clps711x_timer_init, | |
| 85 | .offset = clps711x_gettimeoffset, | |
| 86 | }; |