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/code-patching.h> 19 #include <asm/page.h> 20 #include <asm/pgtable.h> 21 #include <asm/pci-bridge.h> 22 #include <asm/mpic.h> 23 #include <asm/mpc86xx.h> 24 #include <asm/cacheflush.h> 25 26 #include <sysdev/fsl_soc.h> 27 28 #include "mpc86xx.h" 29 30 extern void __secondary_start_mpc86xx(void); 31 extern unsigned long __secondary_hold_acknowledge; 32 33 34 static void __init 35 smp_86xx_release_core(int nr) 36 { 37 __be32 __iomem *mcm_vaddr; 38 unsigned long pcr; 39 40 if (nr < 0 || nr >= NR_CPUS) 41 return; 42 43 /* 44 * Startup Core #nr. 45 */ 46 mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET, 47 MPC86xx_MCM_SIZE); 48 pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2)); 49 pcr |= 1 << (nr + 24); 50 out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr); 51 } 52 53 54 static void __init 55 smp_86xx_kick_cpu(int nr) 56 { 57 unsigned int save_vector; 58 unsigned long target, flags; 59 int n = 0; 60 unsigned int *vector = (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 69 /* Save reset vector */ 70 save_vector = *vector; 71 72 /* Setup fake reset vector to call __secondary_start_mpc86xx. */ 73 target = (unsigned long) __secondary_start_mpc86xx; 74 patch_branch(vector, target, BRANCH_SET_LINK); 75 76 /* Kick that CPU */ 77 smp_86xx_release_core(nr); 78 79 /* Wait a bit for the CPU to take the exception. */ 80 while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000)) 81 mdelay(1); 82 83 /* Restore the exception vector */ 84 *vector = save_vector; 85 flush_icache_range((unsigned long) vector, (unsigned long) vector + 4); 86 87 local_irq_restore(flags); 88 89 pr_debug("wait CPU #%d for %d msecs.\n", nr, n); 90 } 91 92 93 static void __init 94 smp_86xx_setup_cpu(int cpu_nr) 95 { 96 mpic_setup_this_cpu(); 97 } 98 99 100 struct smp_ops_t smp_86xx_ops = { 101 .message_pass = smp_mpic_message_pass, 102 .probe = smp_mpic_probe, 103 .kick_cpu = smp_86xx_kick_cpu, 104 .setup_cpu = smp_86xx_setup_cpu, 105 .take_timebase = smp_generic_take_timebase, 106 .give_timebase = smp_generic_give_timebase, 107 }; 108 109 110 void __init 111 mpc86xx_smp_init(void) 112 { 113 smp_ops = &smp_86xx_ops; 114 } 115