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/cacheflush.h> 24 25 #include <sysdev/fsl_soc.h> 26 27 #include "mpc86xx.h" 28 29 extern void __secondary_start_mpc86xx(void); 30 31 #define MCM_PORT_CONFIG_OFFSET 0x10 32 33 /* Offset from CCSRBAR */ 34 #define MPC86xx_MCM_OFFSET (0x1000) 35 #define MPC86xx_MCM_SIZE (0x1000) 36 37 static void __init 38 smp_86xx_release_core(int nr) 39 { 40 __be32 __iomem *mcm_vaddr; 41 unsigned long pcr; 42 43 if (nr < 0 || nr >= NR_CPUS) 44 return; 45 46 /* 47 * Startup Core #nr. 48 */ 49 mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET, 50 MPC86xx_MCM_SIZE); 51 pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2)); 52 pcr |= 1 << (nr + 24); 53 out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr); 54 55 iounmap(mcm_vaddr); 56 } 57 58 59 static int __init 60 smp_86xx_kick_cpu(int nr) 61 { 62 unsigned int save_vector; 63 unsigned long target, flags; 64 int n = 0; 65 unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100); 66 67 if (nr < 0 || nr >= NR_CPUS) 68 return -ENOENT; 69 70 pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr); 71 72 local_irq_save(flags); 73 74 /* Save reset vector */ 75 save_vector = *vector; 76 77 /* Setup fake reset vector to call __secondary_start_mpc86xx. */ 78 target = (unsigned long) __secondary_start_mpc86xx; 79 patch_branch(vector, target, BRANCH_SET_LINK); 80 81 /* Kick that CPU */ 82 smp_86xx_release_core(nr); 83 84 /* Wait a bit for the CPU to take the exception. */ 85 while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000)) 86 mdelay(1); 87 88 /* Restore the exception vector */ 89 *vector = save_vector; 90 flush_icache_range((unsigned long) vector, (unsigned long) vector + 4); 91 92 local_irq_restore(flags); 93 94 pr_debug("wait CPU #%d for %d msecs.\n", nr, n); 95 96 return 0; 97 } 98 99 100 static void __init 101 smp_86xx_setup_cpu(int cpu_nr) 102 { 103 mpic_setup_this_cpu(); 104 } 105 106 107 struct smp_ops_t smp_86xx_ops = { 108 .message_pass = smp_mpic_message_pass, 109 .probe = smp_mpic_probe, 110 .kick_cpu = smp_86xx_kick_cpu, 111 .setup_cpu = smp_86xx_setup_cpu, 112 .take_timebase = smp_generic_take_timebase, 113 .give_timebase = smp_generic_give_timebase, 114 }; 115 116 117 void __init 118 mpc86xx_smp_init(void) 119 { 120 smp_ops = &smp_86xx_ops; 121 } 122