2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Copyright (C) 2011 Magnus Damm
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/spinlock.h>
21 #include <linux/delay.h>
23 #include <asm/cacheflush.h>
24 #include <asm/smp_plat.h>
25 #include <asm/smp_scu.h>
31 #define AVECR IOMEM(0xfe700040)
32 #define R8A7779_SCU_BASE 0xf0000000
34 static const struct rcar_sysc_ch r8a7779_ch_cpu1 = {
35 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
36 .chan_bit = 1, /* ARM1 */
37 .isr_bit = 1, /* ARM1 */
40 static const struct rcar_sysc_ch r8a7779_ch_cpu2 = {
41 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
42 .chan_bit = 2, /* ARM2 */
43 .isr_bit = 2, /* ARM2 */
46 static const struct rcar_sysc_ch r8a7779_ch_cpu3 = {
47 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
48 .chan_bit = 3, /* ARM3 */
49 .isr_bit = 3, /* ARM3 */
52 static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = {
53 [1] = &r8a7779_ch_cpu1,
54 [2] = &r8a7779_ch_cpu2,
55 [3] = &r8a7779_ch_cpu3,
58 static int r8a7779_platform_cpu_kill(unsigned int cpu)
60 const struct rcar_sysc_ch *ch = NULL;
63 cpu = cpu_logical_map(cpu);
65 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
66 ch = r8a7779_ch_cpu[cpu];
69 ret = rcar_sysc_power_down(ch);
74 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
76 const struct rcar_sysc_ch *ch = NULL;
77 unsigned int lcpu = cpu_logical_map(cpu);
80 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
81 ch = r8a7779_ch_cpu[lcpu];
84 ret = rcar_sysc_power_up(ch);
91 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
93 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
94 __raw_writel(__pa(shmobile_boot_vector), AVECR);
95 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
96 shmobile_boot_arg = (unsigned long)shmobile_scu_base;
98 /* setup r8a7779 specific SCU bits */
99 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
100 shmobile_smp_scu_prepare_cpus(max_cpus);
104 /* power off secondary CPUs */
105 r8a7779_platform_cpu_kill(1);
106 r8a7779_platform_cpu_kill(2);
107 r8a7779_platform_cpu_kill(3);
110 #ifdef CONFIG_HOTPLUG_CPU
111 static int r8a7779_cpu_kill(unsigned int cpu)
113 if (shmobile_smp_scu_cpu_kill(cpu))
114 return r8a7779_platform_cpu_kill(cpu);
118 #endif /* CONFIG_HOTPLUG_CPU */
120 const struct smp_operations r8a7779_smp_ops __initconst = {
121 .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
122 .smp_boot_secondary = r8a7779_boot_secondary,
123 #ifdef CONFIG_HOTPLUG_CPU
124 .cpu_die = shmobile_smp_scu_cpu_die,
125 .cpu_kill = r8a7779_cpu_kill,