1 /* 2 * Author: Xianghua Xiao <x.xiao@freescale.com> 3 * Zhang Wei <wei.zhang@freescale.com> 4 * 5 * Copyright 2006 Freescale Semiconductor Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/stddef.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/delay.h> 17 18 #include <asm/pgtable.h> 19 #include <asm/page.h> 20 #include <asm/pci-bridge.h> 21 #include <asm-powerpc/mpic.h> 22 #include <asm/mpc86xx.h> 23 #include <asm/cacheflush.h> 24 25 #include <sysdev/fsl_soc.h> 26 27 #include "mpc86xx.h" 28 29 extern void __secondary_start_mpc86xx(void); 30 extern unsigned long __secondary_hold_acknowledge; 31 32 33 static void __init 34 smp_86xx_release_core(int nr) 35 { 36 __be32 __iomem *mcm_vaddr; 37 unsigned long pcr; 38 39 if (nr < 0 || nr >= NR_CPUS) 40 return; 41 42 /* 43 * Startup Core #nr. 44 */ 45 mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET, 46 MPC86xx_MCM_SIZE); 47 pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2)); 48 pcr |= 1 << (nr + 24); 49 out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr); 50 } 51 52 53 static void __init 54 smp_86xx_kick_cpu(int nr) 55 { 56 unsigned int save_vector; 57 unsigned long target, flags; 58 int n = 0; 59 volatile unsigned int *vector 60 = (volatile unsigned int *)(KERNELBASE + 0x100); 61 62 if (nr < 0 || nr >= NR_CPUS) 63 return; 64 65 pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr); 66 67 local_irq_save(flags); 68 local_irq_disable(); 69 70 /* Save reset vector */ 71 save_vector = *vector; 72 73 /* Setup fake reset vector to call __secondary_start_mpc86xx. */ 74 target = (unsigned long) __secondary_start_mpc86xx; 75 create_branch((unsigned long)vector, target, BRANCH_SET_LINK); 76 77 /* Kick that CPU */ 78 smp_86xx_release_core(nr); 79 80 /* Wait a bit for the CPU to take the exception. */ 81 while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000)) 82 mdelay(1); 83 84 /* Restore the exception vector */ 85 *vector = save_vector; 86 flush_icache_range((unsigned long) vector, (unsigned long) vector + 4); 87 88 local_irq_restore(flags); 89 90 pr_debug("wait CPU #%d for %d msecs.\n", nr, n); 91 } 92 93 94 static void __init 95 smp_86xx_setup_cpu(int cpu_nr) 96 { 97 mpic_setup_this_cpu(); 98 } 99 100 101 struct smp_ops_t smp_86xx_ops = { 102 .message_pass = smp_mpic_message_pass, 103 .probe = smp_mpic_probe, 104 .kick_cpu = smp_86xx_kick_cpu, 105 .setup_cpu = smp_86xx_setup_cpu, 106 .take_timebase = smp_generic_take_timebase, 107 .give_timebase = smp_generic_give_timebase, 108 }; 109 110 111 void __init 112 mpc86xx_smp_init(void) 113 { 114 smp_ops = &smp_86xx_ops; 115 } 116