1 /* 2 * Copyright (c) 2013 Linaro Ltd. 3 * Copyright (c) 2013 Hisilicon Limited. 4 * Based on arch/arm/mach-vexpress/platsmp.c, Copyright (C) 2002 ARM Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 */ 10 #include <linux/smp.h> 11 #include <linux/io.h> 12 #include <linux/of_address.h> 13 14 #include <asm/cacheflush.h> 15 #include <asm/smp_plat.h> 16 #include <asm/smp_scu.h> 17 18 #include "core.h" 19 20 static void __iomem *ctrl_base; 21 22 void hi3xxx_set_cpu_jump(int cpu, void *jump_addr) 23 { 24 cpu = cpu_logical_map(cpu); 25 if (!cpu || !ctrl_base) 26 return; 27 writel_relaxed(virt_to_phys(jump_addr), ctrl_base + ((cpu - 1) << 2)); 28 } 29 30 int hi3xxx_get_cpu_jump(int cpu) 31 { 32 cpu = cpu_logical_map(cpu); 33 if (!cpu || !ctrl_base) 34 return 0; 35 return readl_relaxed(ctrl_base + ((cpu - 1) << 2)); 36 } 37 38 static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus) 39 { 40 struct device_node *np = NULL; 41 unsigned long base = 0; 42 u32 offset = 0; 43 void __iomem *scu_base = NULL; 44 45 if (scu_a9_has_base()) { 46 base = scu_a9_get_base(); 47 scu_base = ioremap(base, SZ_4K); 48 if (!scu_base) { 49 pr_err("ioremap(scu_base) failed\n"); 50 return; 51 } 52 scu_enable(scu_base); 53 iounmap(scu_base); 54 } 55 if (!ctrl_base) { 56 np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl"); 57 if (!np) { 58 pr_err("failed to find hisilicon,sysctrl node\n"); 59 return; 60 } 61 ctrl_base = of_iomap(np, 0); 62 if (!ctrl_base) { 63 pr_err("failed to map address\n"); 64 return; 65 } 66 if (of_property_read_u32(np, "smp-offset", &offset) < 0) { 67 pr_err("failed to find smp-offset property\n"); 68 return; 69 } 70 ctrl_base += offset; 71 } 72 } 73 74 static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle) 75 { 76 hi3xxx_set_cpu(cpu, true); 77 hi3xxx_set_cpu_jump(cpu, secondary_startup); 78 arch_send_wakeup_ipi_mask(cpumask_of(cpu)); 79 return 0; 80 } 81 82 struct smp_operations hi3xxx_smp_ops __initdata = { 83 .smp_prepare_cpus = hi3xxx_smp_prepare_cpus, 84 .smp_boot_secondary = hi3xxx_boot_secondary, 85 #ifdef CONFIG_HOTPLUG_CPU 86 .cpu_die = hi3xxx_cpu_die, 87 .cpu_kill = hi3xxx_cpu_kill, 88 #endif 89 }; 90