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>
18 #include <asm/smp_plat.h>
19 #include <asm/smp_scu.h>
22 * There are two reset registers, one with self-clearing (SC)
23 * reset and one with non-self-clearing reset (NON_SC).
25 #define CPU_RESET_SC 0x00
26 #define CPU_RESET_NON_SC 0x20
28 #define RESET_VECT 0x00
29 #define SW_RESET_ADDR 0x94
33 static void __iomem *cpu_ctrl;
35 static inline void berlin_perform_reset_cpu(unsigned int cpu)
39 val = readl(cpu_ctrl + CPU_RESET_NON_SC);
40 val &= ~BIT(cpu_logical_map(cpu));
41 writel(val, cpu_ctrl + CPU_RESET_NON_SC);
42 val |= BIT(cpu_logical_map(cpu));
43 writel(val, cpu_ctrl + CPU_RESET_NON_SC);
46 static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle)
52 * Reset the CPU, making it to execute the instruction in the reset
55 berlin_perform_reset_cpu(cpu);
60 static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
62 struct device_node *np;
63 void __iomem *scu_base;
64 void __iomem *vectors_base;
66 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
67 scu_base = of_iomap(np, 0);
72 np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl");
73 cpu_ctrl = of_iomap(np, 0);
78 vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K);
86 * Write the first instruction the CPU will execute after being reset
87 * in the reset exception vector.
89 writel(boot_inst, vectors_base + RESET_VECT);
92 * Write the secondary startup address into the SW reset address
93 * vector. This is used by boot_inst.
95 writel(virt_to_phys(secondary_startup), vectors_base + SW_RESET_ADDR);
97 iounmap(vectors_base);
102 #ifdef CONFIG_HOTPLUG_CPU
103 static void berlin_cpu_die(unsigned int cpu)
105 v7_exit_coherency_flush(louis);
110 static int berlin_cpu_kill(unsigned int cpu)
114 val = readl(cpu_ctrl + CPU_RESET_NON_SC);
115 val &= ~BIT(cpu_logical_map(cpu));
116 writel(val, cpu_ctrl + CPU_RESET_NON_SC);
122 static const struct smp_operations berlin_smp_ops __initconst = {
123 .smp_prepare_cpus = berlin_smp_prepare_cpus,
124 .smp_boot_secondary = berlin_boot_secondary,
125 #ifdef CONFIG_HOTPLUG_CPU
126 .cpu_die = berlin_cpu_die,
127 .cpu_kill = berlin_cpu_kill,
130 CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);