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 #include <linux/pgtable.h> 14 15 #include <asm/code-patching.h> 16 #include <asm/page.h> 17 #include <asm/pci-bridge.h> 18 #include <asm/mpic.h> 19 #include <asm/cacheflush.h> 20 #include <asm/inst.h> 21 22 #include <sysdev/fsl_soc.h> 23 24 #include "mpc86xx.h" 25 26 extern void __secondary_start_mpc86xx(void); 27 28 #define MCM_PORT_CONFIG_OFFSET 0x10 29 30 /* Offset from CCSRBAR */ 31 #define MPC86xx_MCM_OFFSET (0x1000) 32 #define MPC86xx_MCM_SIZE (0x1000) 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 iounmap(mcm_vaddr); 53 } 54 55 56 static int __init 57 smp_86xx_kick_cpu(int nr) 58 { 59 unsigned int save_vector; 60 unsigned long target, flags; 61 int n = 0; 62 unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100); 63 64 if (nr < 0 || nr >= NR_CPUS) 65 return -ENOENT; 66 67 pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr); 68 69 local_irq_save(flags); 70 71 /* Save reset vector */ 72 save_vector = *vector; 73 74 /* Setup fake reset vector to call __secondary_start_mpc86xx. */ 75 target = (unsigned long) __secondary_start_mpc86xx; 76 patch_branch(vector, target, BRANCH_SET_LINK); 77 78 /* Kick that CPU */ 79 smp_86xx_release_core(nr); 80 81 /* Wait a bit for the CPU to take the exception. */ 82 while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000)) 83 mdelay(1); 84 85 /* Restore the exception vector */ 86 patch_instruction(vector, ppc_inst(save_vector)); 87 88 local_irq_restore(flags); 89 90 pr_debug("wait CPU #%d for %d msecs.\n", nr, n); 91 92 return 0; 93 } 94 95 96 static void __init 97 smp_86xx_setup_cpu(int cpu_nr) 98 { 99 mpic_setup_this_cpu(); 100 } 101 102 103 struct smp_ops_t smp_86xx_ops = { 104 .cause_nmi_ipi = NULL, 105 .message_pass = smp_mpic_message_pass, 106 .probe = smp_mpic_probe, 107 .kick_cpu = smp_86xx_kick_cpu, 108 .setup_cpu = smp_86xx_setup_cpu, 109 .take_timebase = smp_generic_take_timebase, 110 .give_timebase = smp_generic_give_timebase, 111 }; 112 113 114 void __init 115 mpc86xx_smp_init(void) 116 { 117 smp_ops = &smp_86xx_ops; 118 } 119