1 /*
2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Copyright (C) 2011 Magnus Damm
6 *
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.
10 *
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.
15 */
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/spinlock.h>
20 #include <linux/io.h>
21 #include <linux/delay.h>
22
23 #include <asm/cacheflush.h>
24 #include <asm/smp_plat.h>
25 #include <asm/smp_scu.h>
26
27 #include "common.h"
28 #include "pm-rcar.h"
29 #include "r8a7779.h"
30
31 #define AVECR IOMEM(0xfe700040)
32 #define R8A7779_SCU_BASE 0xf0000000
33
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 */
38 };
39
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 */
44 };
45
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 */
50 };
51
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,
56 };
57
r8a7779_platform_cpu_kill(unsigned int cpu)58 static int r8a7779_platform_cpu_kill(unsigned int cpu)
59 {
60 const struct rcar_sysc_ch *ch = NULL;
61 int ret = -EIO;
62
63 cpu = cpu_logical_map(cpu);
64
65 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
66 ch = r8a7779_ch_cpu[cpu];
67
68 if (ch)
69 ret = rcar_sysc_power_down(ch);
70
71 return ret ? ret : 1;
72 }
73
r8a7779_boot_secondary(unsigned int cpu,struct task_struct * idle)74 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
75 {
76 const struct rcar_sysc_ch *ch = NULL;
77 unsigned int lcpu = cpu_logical_map(cpu);
78 int ret;
79
80 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
81 ch = r8a7779_ch_cpu[lcpu];
82
83 if (ch)
84 ret = rcar_sysc_power_up(ch);
85 else
86 ret = -EIO;
87
88 return ret;
89 }
90
r8a7779_smp_prepare_cpus(unsigned int max_cpus)91 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
92 {
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;
97
98 /* setup r8a7779 specific SCU bits */
99 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
100 shmobile_smp_scu_prepare_cpus(max_cpus);
101
102 r8a7779_pm_init();
103
104 /* power off secondary CPUs */
105 r8a7779_platform_cpu_kill(1);
106 r8a7779_platform_cpu_kill(2);
107 r8a7779_platform_cpu_kill(3);
108 }
109
110 #ifdef CONFIG_HOTPLUG_CPU
r8a7779_cpu_kill(unsigned int cpu)111 static int r8a7779_cpu_kill(unsigned int cpu)
112 {
113 if (shmobile_smp_scu_cpu_kill(cpu))
114 return r8a7779_platform_cpu_kill(cpu);
115
116 return 0;
117 }
118 #endif /* CONFIG_HOTPLUG_CPU */
119
120 struct smp_operations r8a7779_smp_ops __initdata = {
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,
126 #endif
127 };
128