| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * BRIEF MODULE DESCRIPTION |
| 3 | * Galileo EV96100 rtc routines. |
| 4 | * |
| 5 | * Copyright 2000 MontaVista Software Inc. |
| 6 | * Author: MontaVista Software, Inc. |
| 7 | * ppopov@mvista.com or source@mvista.com |
| 8 | * |
| 9 | * This file was derived from Carsten Langgaard's |
| 10 | * arch/mips/mips-boards/atlas/atlas_rtc.c. |
| 11 | * |
| 12 | * Carsten Langgaard, carstenl@mips.com |
| 13 | * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify it |
| 16 | * under the terms of the GNU General Public License as published by the |
| 17 | * Free Software Foundation; either version 2 of the License, or (at your |
| 18 | * option) any later version. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
| 23 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 24 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 26 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 27 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 29 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | * |
| 31 | * You should have received a copy of the GNU General Public License along |
| 32 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 33 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 34 | */ |
| 35 | #include <linux/config.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/kernel_stat.h> |
| 38 | #include <linux/module.h> |
| 39 | #include <linux/sched.h> |
| 40 | #include <linux/spinlock.h> |
| 41 | #include <linux/timex.h> |
| 42 | |
| 43 | #include <asm/mipsregs.h> |
| 44 | #include <asm/ptrace.h> |
| 45 | #include <asm/time.h> |
| 46 | |
| 47 | |
| 48 | #define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5) |
| 49 | |
| 50 | extern volatile unsigned long wall_jiffies; |
| 51 | unsigned long missed_heart_beats = 0; |
| 52 | |
| 53 | static unsigned long r4k_offset; /* Amount to increment compare reg each time */ |
| 54 | static unsigned long r4k_cur; /* What counter should be at next timer irq */ |
| 55 | |
| 56 | static inline void ack_r4ktimer(unsigned long newval) |
| 57 | { |
| 58 | write_c0_compare(newval); |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * There are a lot of conceptually broken versions of the MIPS timer interrupt |
| 63 | * handler floating around. This one is rather different, but the algorithm |
| 64 | * is probably more robust. |
| 65 | */ |
| 66 | void mips_timer_interrupt(struct pt_regs *regs) |
| 67 | { |
| 68 | int irq = 7; /* FIX ME */ |
| 69 | |
| 70 | if (r4k_offset == 0) { |
| 71 | goto null; |
| 72 | } |
| 73 | |
| 74 | do { |
| 75 | kstat_this_cpu.irqs[irq]++; |
| 76 | do_timer(regs); |
| 77 | #ifndef CONFIG_SMP |
| 78 | update_process_times(user_mode(regs)); |
| 79 | #endif |
| 80 | r4k_cur += r4k_offset; |
| 81 | ack_r4ktimer(r4k_cur); |
| 82 | |
| 83 | } while (((unsigned long)read_c0_count() |
| 84 | - r4k_cur) < 0x7fffffff); |
| 85 | return; |
| 86 | |
| 87 | null: |
| 88 | ack_r4ktimer(0); |
| 89 | } |