1 /* 2 * Copyright 2010-2011 Calxeda, Inc. 3 * Copyright 2012 Pavel Machek <pavel@denx.de> 4 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd. 5 * Copyright (C) 2012 Altera Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #include <linux/delay.h> 20 #include <linux/init.h> 21 #include <linux/smp.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/of_address.h> 25 26 #include <asm/cacheflush.h> 27 #include <asm/smp_scu.h> 28 #include <asm/smp_plat.h> 29 30 #include "core.h" 31 32 static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) 33 { 34 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; 35 36 if (cpu1start_addr) { 37 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); 38 39 __raw_writel(virt_to_phys(socfpga_secondary_startup), 40 (sys_manager_base_addr + (cpu1start_addr & 0x000000ff))); 41 42 flush_cache_all(); 43 smp_wmb(); 44 outer_clean_range(0, trampoline_size); 45 46 /* This will release CPU #1 out of reset.*/ 47 __raw_writel(0, rst_manager_base_addr + 0x10); 48 } 49 50 return 0; 51 } 52 53 /* 54 * Initialise the CPU possible map early - this describes the CPUs 55 * which may be present or become present in the system. 56 */ 57 static void __init socfpga_smp_init_cpus(void) 58 { 59 unsigned int i, ncores; 60 61 ncores = scu_get_core_count(socfpga_scu_base_addr); 62 63 for (i = 0; i < ncores; i++) 64 set_cpu_possible(i, true); 65 66 /* sanity check */ 67 if (ncores > num_possible_cpus()) { 68 pr_warn("socfpga: no. of cores (%d) greater than configured" 69 "maximum of %d - clipping\n", ncores, num_possible_cpus()); 70 ncores = num_possible_cpus(); 71 } 72 73 for (i = 0; i < ncores; i++) 74 set_cpu_possible(i, true); 75 } 76 77 static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus) 78 { 79 scu_enable(socfpga_scu_base_addr); 80 } 81 82 /* 83 * platform-specific code to shutdown a CPU 84 * 85 * Called with IRQs disabled 86 */ 87 static void socfpga_cpu_die(unsigned int cpu) 88 { 89 cpu_do_idle(); 90 91 /* We should have never returned from idle */ 92 panic("cpu %d unexpectedly exit from shutdown\n", cpu); 93 } 94 95 struct smp_operations socfpga_smp_ops __initdata = { 96 .smp_init_cpus = socfpga_smp_init_cpus, 97 .smp_prepare_cpus = socfpga_smp_prepare_cpus, 98 .smp_boot_secondary = socfpga_boot_secondary, 99 #ifdef CONFIG_HOTPLUG_CPU 100 .cpu_die = socfpga_cpu_die, 101 #endif 102 }; 103