projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| bbd0abda PM |
1 | /* |
| 2 | * Smp support for CHRP machines. | |
| 3 | * | |
| 4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great | |
| 5 | * deal of code from the sparc and intel versions. | |
| 6 | * | |
| 7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| bbd0abda PM |
11 | #include <linux/kernel.h> |
| 12 | #include <linux/sched.h> | |
| 13 | #include <linux/smp.h> | |
| bbd0abda PM |
14 | #include <linux/interrupt.h> |
| 15 | #include <linux/kernel_stat.h> | |
| 16 | #include <linux/delay.h> | |
| 17 | #include <linux/init.h> | |
| 18 | #include <linux/spinlock.h> | |
| 19 | ||
| 20 | #include <asm/ptrace.h> | |
| 21 | #include <asm/atomic.h> | |
| 22 | #include <asm/irq.h> | |
| 23 | #include <asm/page.h> | |
| 24 | #include <asm/pgtable.h> | |
| 25 | #include <asm/sections.h> | |
| 26 | #include <asm/io.h> | |
| 27 | #include <asm/prom.h> | |
| 28 | #include <asm/smp.h> | |
| 29 | #include <asm/residual.h> | |
| 30 | #include <asm/time.h> | |
| bbd0abda | 31 | #include <asm/machdep.h> |
| 80579e1f | 32 | #include <asm/mpic.h> |
| 44aedfe7 | 33 | #include <asm/rtas.h> |
| bbd0abda | 34 | |
| bbd0abda PM |
35 | static void __devinit smp_chrp_kick_cpu(int nr) |
| 36 | { | |
| 37 | *(unsigned long *)KERNELBASE = nr; | |
| 38 | asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory"); | |
| 39 | } | |
| 40 | ||
| 41 | static void __devinit smp_chrp_setup_cpu(int cpu_nr) | |
| 42 | { | |
| 80579e1f | 43 | mpic_setup_this_cpu(); |
| bbd0abda PM |
44 | } |
| 45 | ||
| 46 | static DEFINE_SPINLOCK(timebase_lock); | |
| 47 | static unsigned int timebase_upper = 0, timebase_lower = 0; | |
| 48 | ||
| 49 | void __devinit smp_chrp_give_timebase(void) | |
| 50 | { | |
| 51 | spin_lock(&timebase_lock); | |
| 52 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); | |
| 53 | timebase_upper = get_tbu(); | |
| 54 | timebase_lower = get_tbl(); | |
| 55 | spin_unlock(&timebase_lock); | |
| 56 | ||
| 57 | while (timebase_upper || timebase_lower) | |
| 58 | barrier(); | |
| 59 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
| 60 | } | |
| 61 | ||
| 62 | void __devinit smp_chrp_take_timebase(void) | |
| 63 | { | |
| 64 | while (!(timebase_upper || timebase_lower)) | |
| 65 | barrier(); | |
| 66 | spin_lock(&timebase_lock); | |
| 67 | set_tb(timebase_upper, timebase_lower); | |
| 68 | timebase_upper = 0; | |
| 69 | timebase_lower = 0; | |
| 70 | spin_unlock(&timebase_lock); | |
| 71 | printk("CPU %i taken timebase\n", smp_processor_id()); | |
| 72 | } | |
| 73 | ||
| 74 | /* CHRP with openpic */ | |
| 75 | struct smp_ops_t chrp_smp_ops = { | |
| 80579e1f | 76 | .message_pass = smp_mpic_message_pass, |
| 5ad57078 | 77 | .probe = smp_mpic_probe, |
| bbd0abda PM |
78 | .kick_cpu = smp_chrp_kick_cpu, |
| 79 | .setup_cpu = smp_chrp_setup_cpu, | |
| 80 | .give_timebase = smp_chrp_give_timebase, | |
| 81 | .take_timebase = smp_chrp_take_timebase, | |
| 82 | }; |