1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Author: Xianghua Xiao <x.xiao@freescale.com> 4 * Zhang Wei <wei.zhang@freescale.com> 5 * 6 * Copyright 2006 Freescale Semiconductor Inc. 7 */ 8 9 #include <linux/stddef.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/delay.h> 13 14 #include <asm/code-patching.h> 15 #include <asm/page.h> 16 #include <asm/pgtable.h> 17 #include <asm/pci-bridge.h> 18 #include <asm/mpic.h> 19 #include <asm/cacheflush.h> 20 21 #include <sysdev/fsl_soc.h> 22 23 #include "mpc86xx.h" 24 25 extern void __secondary_start_mpc86xx(void); 26 27 #define MCM_PORT_CONFIG_OFFSET 0x10 28 29 /* Offset from CCSRBAR */ 30 #define MPC86xx_MCM_OFFSET (0x1000) 31 #define MPC86xx_MCM_SIZE (0x1000) 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 iounmap(mcm_vaddr); 52 } 53 54 55 static int __init 56 smp_86xx_kick_cpu(int nr) 57 { 58 unsigned int save_vector; 59 unsigned long target, flags; 60 int n = 0; 61 unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100); 62 63 if (nr < 0 || nr >= NR_CPUS) 64 return -ENOENT; 65 66 pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr); 67 68 local_irq_save(flags); 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 patch_branch(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 patch_instruction(vector, save_vector); 86 87 local_irq_restore(flags); 88 89 pr_debug("wait CPU #%d for %d msecs.\n", nr, n); 90 91 return 0; 92 } 93 94 95 static void __init 96 smp_86xx_setup_cpu(int cpu_nr) 97 { 98 mpic_setup_this_cpu(); 99 } 100 101 102 struct smp_ops_t smp_86xx_ops = { 103 .cause_nmi_ipi = NULL, 104 .message_pass = smp_mpic_message_pass, 105 .probe = smp_mpic_probe, 106 .kick_cpu = smp_86xx_kick_cpu, 107 .setup_cpu = smp_86xx_setup_cpu, 108 .take_timebase = smp_generic_take_timebase, 109 .give_timebase = smp_generic_give_timebase, 110 }; 111 112 113 void __init 114 mpc86xx_smp_init(void) 115 { 116 smp_ops = &smp_86xx_ops; 117 } 118