2 * Copyright (C) 2014 Marvell Technology Group Ltd.
4 * Antoine Ténart <antoine.tenart@free-electrons.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <linux/delay.h>
14 #include <linux/of_address.h>
16 #include <asm/cacheflush.h>
17 #include <asm/smp_plat.h>
18 #include <asm/smp_scu.h>
20 #define CPU_RESET 0x00
22 #define RESET_VECT 0x00
23 #define SW_RESET_ADDR 0x94
25 extern void berlin_secondary_startup(void);
28 static void __iomem *cpu_ctrl;
30 static inline void berlin_perform_reset_cpu(unsigned int cpu)
34 val = readl(cpu_ctrl + CPU_RESET);
35 val |= BIT(cpu_logical_map(cpu));
36 writel(val, cpu_ctrl + CPU_RESET);
39 static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle)
45 * Reset the CPU, making it to execute the instruction in the reset
48 berlin_perform_reset_cpu(cpu);
53 static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
55 struct device_node *np;
56 void __iomem *scu_base;
57 void __iomem *vectors_base;
59 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
60 scu_base = of_iomap(np, 0);
65 np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl");
66 cpu_ctrl = of_iomap(np, 0);
71 vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K);
79 * Write the first instruction the CPU will execute after being reset
80 * in the reset exception vector.
82 writel(boot_inst, vectors_base + RESET_VECT);
85 * Write the secondary startup address into the SW reset address
86 * vector. This is used by boot_inst.
88 writel(virt_to_phys(berlin_secondary_startup), vectors_base + SW_RESET_ADDR);
90 iounmap(vectors_base);
95 static struct smp_operations berlin_smp_ops __initdata = {
96 .smp_prepare_cpus = berlin_smp_prepare_cpus,
97 .smp_boot_secondary = berlin_boot_secondary,
99 CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);