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 (socfpga_cpu1start_addr) { 37 /* This will put CPU #1 into reset. */ 38 writel(RSTMGR_MPUMODRST_CPU1, 39 rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); 40 41 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); 42 43 writel(virt_to_phys(socfpga_secondary_startup), 44 sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff)); 45 46 flush_cache_all(); 47 smp_wmb(); 48 outer_clean_range(0, trampoline_size); 49 50 /* This will release CPU #1 out of reset. */ 51 writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); 52 } 53 54 return 0; 55 } 56 57 static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus) 58 { 59 struct device_node *np; 60 void __iomem *socfpga_scu_base_addr; 61 62 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); 63 if (!np) { 64 pr_err("%s: missing scu\n", __func__); 65 return; 66 } 67 68 socfpga_scu_base_addr = of_iomap(np, 0); 69 if (!socfpga_scu_base_addr) 70 return; 71 scu_enable(socfpga_scu_base_addr); 72 } 73 74 /* 75 * platform-specific code to shutdown a CPU 76 * 77 * Called with IRQs disabled 78 */ 79 static void socfpga_cpu_die(unsigned int cpu) 80 { 81 /* Do WFI. If we wake up early, go back into WFI */ 82 while (1) 83 cpu_do_idle(); 84 } 85 86 struct smp_operations socfpga_smp_ops __initdata = { 87 .smp_prepare_cpus = socfpga_smp_prepare_cpus, 88 .smp_boot_secondary = socfpga_boot_secondary, 89 #ifdef CONFIG_HOTPLUG_CPU 90 .cpu_die = socfpga_cpu_die, 91 #endif 92 }; 93