1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// SPDX-License-Identifier: GPL-2.0
/*
* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
*
* Copyright (C) 2010 Magnus Damm
* Copyright (C) 2010 Takashi Yoshii
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/smp_plat.h>
#include "common.h"
#include "sh73a0.h"
#define CPG_BASE2 0xe6151000
#define WUPCR 0x10 /* System-CPU Wake Up Control Register */
#define SRESCR 0x18 /* System-CPU Software Reset Control Register */
#define PSTR 0x40 /* System-CPU Power Status Register */
#define SYSC_BASE 0xe6180000
#define SBAR 0x20 /* SYS Boot Address Register */
#define AP_BASE 0xe6f10000
#define APARMBAREA 0x20 /* Address Translation Area Register */
#define SH73A0_SCU_BASE 0xf0000000
static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
unsigned int lcpu = cpu_logical_map(cpu);
void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);
if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
writel(1 << lcpu, cpg2 + WUPCR); /* wake up */
else
writel(1 << lcpu, cpg2 + SRESCR); /* reset */
iounmap(cpg2);
return 0;
}
static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
{
void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE);
void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE);
/* Map the reset vector (in headsmp.S) */
writel(0, ap + APARMBAREA); /* 4k */
writel(__pa(shmobile_boot_vector), sysc + SBAR);
iounmap(sysc);
iounmap(ap);
/* setup sh73a0 specific SCU bits */
shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
}
const struct smp_operations sh73a0_smp_ops __initconst = {
.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
.smp_boot_secondary = sh73a0_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_can_disable = shmobile_smp_cpu_can_disable,
.cpu_die = shmobile_smp_scu_cpu_die,
.cpu_kill = shmobile_smp_scu_cpu_kill,
#endif
};
|
