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>
27 #include <asm/cacheflush.h>
28 #include <asm/smp_plat.h>
29 #include <asm/smp_scu.h>
30 #include <asm/smp_twd.h>
36 #define AVECR IOMEM(0xfe700040)
37 #define R8A7779_SCU_BASE 0xf0000000
39 static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
40 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
41 .chan_bit = 1, /* ARM1 */
42 .isr_bit = 1, /* ARM1 */
45 static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
46 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
47 .chan_bit = 2, /* ARM2 */
48 .isr_bit = 2, /* ARM2 */
51 static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
52 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
53 .chan_bit = 3, /* ARM3 */
54 .isr_bit = 3, /* ARM3 */
57 static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
58 [1] = &r8a7779_ch_cpu1,
59 [2] = &r8a7779_ch_cpu2,
60 [3] = &r8a7779_ch_cpu3,
63 #ifdef CONFIG_HAVE_ARM_TWD
64 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
65 void __init r8a7779_register_twd(void)
67 twd_local_timer_register(&twd_local_timer);
71 static int r8a7779_platform_cpu_kill(unsigned int cpu)
73 struct rcar_sysc_ch *ch = NULL;
76 cpu = cpu_logical_map(cpu);
78 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
79 ch = r8a7779_ch_cpu[cpu];
82 ret = rcar_sysc_power_down(ch);
87 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
89 struct rcar_sysc_ch *ch = NULL;
90 unsigned int lcpu = cpu_logical_map(cpu);
93 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
94 ch = r8a7779_ch_cpu[lcpu];
97 ret = rcar_sysc_power_up(ch);
104 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
106 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
107 __raw_writel(__pa(shmobile_boot_vector), AVECR);
108 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
109 shmobile_boot_arg = (unsigned long)shmobile_scu_base;
111 /* setup r8a7779 specific SCU bits */
112 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
113 shmobile_smp_scu_prepare_cpus(max_cpus);
117 /* power off secondary CPUs */
118 r8a7779_platform_cpu_kill(1);
119 r8a7779_platform_cpu_kill(2);
120 r8a7779_platform_cpu_kill(3);
123 #ifdef CONFIG_HOTPLUG_CPU
124 static int r8a7779_cpu_kill(unsigned int cpu)
126 if (shmobile_smp_scu_cpu_kill(cpu))
127 return r8a7779_platform_cpu_kill(cpu);
132 static int r8a7779_cpu_disable(unsigned int cpu)
134 /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
135 return cpu == 0 ? -EPERM : 0;
137 #endif /* CONFIG_HOTPLUG_CPU */
139 struct smp_operations r8a7779_smp_ops __initdata = {
140 .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
141 .smp_boot_secondary = r8a7779_boot_secondary,
142 #ifdef CONFIG_HOTPLUG_CPU
143 .cpu_disable = r8a7779_cpu_disable,
144 .cpu_die = shmobile_smp_scu_cpu_die,
145 .cpu_kill = r8a7779_cpu_kill,