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 * 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
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/smp.h>
23 #include <linux/spinlock.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>
33 #define AVECR IOMEM(0xfe700040)
34 #define R8A7779_SCU_BASE 0xf0000000
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 */
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 */
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 */
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
,
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)
64 twd_local_timer_register(&twd_local_timer
);
68 static int r8a7779_platform_cpu_kill(unsigned int cpu
)
70 struct r8a7779_pm_ch
*ch
= NULL
;
73 cpu
= cpu_logical_map(cpu
);
75 if (cpu
< ARRAY_SIZE(r8a7779_ch_cpu
))
76 ch
= r8a7779_ch_cpu
[cpu
];
79 ret
= r8a7779_sysc_power_down(ch
);
84 static int __cpuinit
r8a7779_boot_secondary(unsigned int cpu
, struct task_struct
*idle
)
86 struct r8a7779_pm_ch
*ch
= NULL
;
89 cpu
= cpu_logical_map(cpu
);
91 if (cpu
< ARRAY_SIZE(r8a7779_ch_cpu
))
92 ch
= r8a7779_ch_cpu
[cpu
];
95 ret
= r8a7779_sysc_power_up(ch
);
100 static void __init
r8a7779_smp_prepare_cpus(unsigned int max_cpus
)
102 scu_enable(shmobile_scu_base
);
104 /* Map the reset vector (in headsmp-scu.S) */
105 __raw_writel(__pa(shmobile_secondary_vector_scu
), AVECR
);
107 /* enable cache coherency on booting CPU */
108 scu_power_mode(shmobile_scu_base
, SCU_PM_NORMAL
);
112 /* power off secondary CPUs */
113 r8a7779_platform_cpu_kill(1);
114 r8a7779_platform_cpu_kill(2);
115 r8a7779_platform_cpu_kill(3);
118 static void __init
r8a7779_smp_init_cpus(void)
120 /* setup r8a7779 specific SCU base */
121 shmobile_scu_base
= IOMEM(R8A7779_SCU_BASE
);
123 shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base
));
126 #ifdef CONFIG_HOTPLUG_CPU
127 static int r8a7779_scu_psr_core_disabled(int cpu
)
129 unsigned long mask
= 3 << (cpu
* 8);
131 if ((__raw_readl(shmobile_scu_base
+ 8) & mask
) == mask
)
137 static int r8a7779_cpu_kill(unsigned int cpu
)
141 /* this function is running on another CPU than the offline target,
142 * here we need wait for shutdown code in platform_cpu_die() to
143 * finish before asking SoC-specific code to power off the CPU core.
145 for (k
= 0; k
< 1000; k
++) {
146 if (r8a7779_scu_psr_core_disabled(cpu
))
147 return r8a7779_platform_cpu_kill(cpu
);
155 static void r8a7779_cpu_die(unsigned int cpu
)
160 /* disable cache coherency */
161 scu_power_mode(shmobile_scu_base
, SCU_PM_POWEROFF
);
163 /* Endless loop until power off from r8a7779_cpu_kill() */
168 static int r8a7779_cpu_disable(unsigned int cpu
)
170 /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
171 return cpu
== 0 ? -EPERM
: 0;
173 #endif /* CONFIG_HOTPLUG_CPU */
175 struct smp_operations r8a7779_smp_ops __initdata
= {
176 .smp_init_cpus
= r8a7779_smp_init_cpus
,
177 .smp_prepare_cpus
= r8a7779_smp_prepare_cpus
,
178 .smp_boot_secondary
= r8a7779_boot_secondary
,
179 #ifdef CONFIG_HOTPLUG_CPU
180 .cpu_kill
= r8a7779_cpu_kill
,
181 .cpu_die
= r8a7779_cpu_die
,
182 .cpu_disable
= r8a7779_cpu_disable
,