Merge remote-tracking branch 'spi/fix/core' into spi-linus
[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / arm / mach-shmobile / smp-r8a7779.c
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  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
19  */
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/smp.h>
23 #include <linux/spinlock.h>
24 #include <linux/io.h>
25 #include <linux/delay.h>
26 #include <mach/common.h>
27 #include <mach/r8a7779.h>
28 #include <asm/cacheflush.h>
29 #include <asm/smp_plat.h>
30 #include <asm/smp_scu.h>
31 #include <asm/smp_twd.h>
32
33 #define AVECR IOMEM(0xfe700040)
34 #define R8A7779_SCU_BASE 0xf0000000
35
36 static struct r8a7779_pm_ch r8a7779_ch_cpu1 = {
37         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
38         .chan_bit = 1, /* ARM1 */
39         .isr_bit = 1, /* ARM1 */
40 };
41
42 static struct r8a7779_pm_ch r8a7779_ch_cpu2 = {
43         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
44         .chan_bit = 2, /* ARM2 */
45         .isr_bit = 2, /* ARM2 */
46 };
47
48 static struct r8a7779_pm_ch r8a7779_ch_cpu3 = {
49         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
50         .chan_bit = 3, /* ARM3 */
51         .isr_bit = 3, /* ARM3 */
52 };
53
54 static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = {
55         [1] = &r8a7779_ch_cpu1,
56         [2] = &r8a7779_ch_cpu2,
57         [3] = &r8a7779_ch_cpu3,
58 };
59
60 #ifdef CONFIG_HAVE_ARM_TWD
61 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
62 void __init r8a7779_register_twd(void)
63 {
64         twd_local_timer_register(&twd_local_timer);
65 }
66 #endif
67
68 static int r8a7779_platform_cpu_kill(unsigned int cpu)
69 {
70         struct r8a7779_pm_ch *ch = NULL;
71         int ret = -EIO;
72
73         cpu = cpu_logical_map(cpu);
74
75         if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
76                 ch = r8a7779_ch_cpu[cpu];
77
78         if (ch)
79                 ret = r8a7779_sysc_power_down(ch);
80
81         return ret ? ret : 1;
82 }
83
84 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
85 {
86         struct r8a7779_pm_ch *ch = NULL;
87         unsigned int lcpu = cpu_logical_map(cpu);
88         int ret;
89
90         if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
91                 ch = r8a7779_ch_cpu[lcpu];
92
93         if (ch)
94                 ret = r8a7779_sysc_power_up(ch);
95         else
96                 ret = -EIO;
97
98         return ret;
99 }
100
101 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
102 {
103         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
104         __raw_writel(__pa(shmobile_boot_vector), AVECR);
105         shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
106         shmobile_boot_arg = (unsigned long)shmobile_scu_base;
107
108         /* setup r8a7779 specific SCU bits */
109         shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
110         shmobile_smp_scu_prepare_cpus(max_cpus);
111
112         r8a7779_pm_init();
113
114         /* power off secondary CPUs */
115         r8a7779_platform_cpu_kill(1);
116         r8a7779_platform_cpu_kill(2);
117         r8a7779_platform_cpu_kill(3);
118 }
119
120 #ifdef CONFIG_HOTPLUG_CPU
121 static int r8a7779_cpu_kill(unsigned int cpu)
122 {
123         if (shmobile_smp_scu_cpu_kill(cpu))
124                 return r8a7779_platform_cpu_kill(cpu);
125
126         return 0;
127 }
128
129 static int r8a7779_cpu_disable(unsigned int cpu)
130 {
131         /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
132         return cpu == 0 ? -EPERM : 0;
133 }
134 #endif /* CONFIG_HOTPLUG_CPU */
135
136 struct smp_operations r8a7779_smp_ops  __initdata = {
137         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
138         .smp_boot_secondary     = r8a7779_boot_secondary,
139 #ifdef CONFIG_HOTPLUG_CPU
140         .cpu_disable            = r8a7779_cpu_disable,
141         .cpu_die                = shmobile_smp_scu_cpu_die,
142         .cpu_kill               = r8a7779_cpu_kill,
143 #endif
144 };