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>
21 * There are two reset registers, one with self-clearing (SC)
22 * reset and one with non-self-clearing reset (NON_SC).
24 #define CPU_RESET_SC 0x00
25 #define CPU_RESET_NON_SC 0x20
27 #define RESET_VECT 0x00
28 #define SW_RESET_ADDR 0x94
32 static void __iomem *cpu_ctrl;
34 static inline void berlin_perform_reset_cpu(unsigned int cpu)
38 val = readl(cpu_ctrl + CPU_RESET_NON_SC);
39 val &= ~BIT(cpu_logical_map(cpu));
40 writel(val, cpu_ctrl + CPU_RESET_NON_SC);
41 val |= BIT(cpu_logical_map(cpu));
42 writel(val, cpu_ctrl + CPU_RESET_NON_SC);
45 static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle)
51 * Reset the CPU, making it to execute the instruction in the reset
54 berlin_perform_reset_cpu(cpu);
59 static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
61 struct device_node *np;
62 void __iomem *scu_base;
63 void __iomem *vectors_base;
65 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
66 scu_base = of_iomap(np, 0);
71 np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl");
72 cpu_ctrl = of_iomap(np, 0);
77 vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K);
85 * Write the first instruction the CPU will execute after being reset
86 * in the reset exception vector.
88 writel(boot_inst, vectors_base + RESET_VECT);
91 * Write the secondary startup address into the SW reset address
92 * vector. This is used by boot_inst.
94 writel(virt_to_phys(secondary_startup), vectors_base + SW_RESET_ADDR);
96 iounmap(vectors_base);
101 static struct smp_operations berlin_smp_ops __initdata = {
102 .smp_prepare_cpus = berlin_smp_prepare_cpus,
103 .smp_boot_secondary = berlin_boot_secondary,
105 CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);