1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
4 *
5 * Copyright (C) 2010  Magnus Damm
6 * Copyright (C) 2010  Takashi Yoshii
7 */
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/smp.h>
11#include <linux/io.h>
12#include <linux/delay.h>
13
14#include <asm/smp_plat.h>
15
16#include "common.h"
17#include "sh73a0.h"
18
19#define CPG_BASE2	0xe6151000
20#define WUPCR		0x10	/* System-CPU Wake Up Control Register */
21#define SRESCR		0x18	/* System-CPU Software Reset Control Register */
22#define PSTR		0x40	/* System-CPU Power Status Register */
23
24#define SYSC_BASE	0xe6180000
25#define SBAR		0x20	/* SYS Boot Address Register */
26
27#define AP_BASE		0xe6f10000
28#define APARMBAREA	0x20	/* Address Translation Area Register */
29
30#define SH73A0_SCU_BASE 0xf0000000
31
32static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
33{
34	unsigned int lcpu = cpu_logical_map(cpu);
35	void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);
36
37	if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
38		writel(1 << lcpu, cpg2 + WUPCR);	/* wake up */
39	else
40		writel(1 << lcpu, cpg2 + SRESCR);	/* reset */
41	iounmap(cpg2);
42	return 0;
43}
44
45static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
46{
47	void __iomem *ap, *sysc;
48
49	if (!request_mem_region(0, SZ_4K, "Boot Area")) {
50		pr_err("Failed to request boot area\n");
51		return;
52	}
53
54	/* Map the reset vector (in headsmp.S) */
55	ap = ioremap(AP_BASE, PAGE_SIZE);
56	sysc = ioremap(SYSC_BASE, PAGE_SIZE);
57	writel(0, ap + APARMBAREA);      /* 4k */
58	writel(__pa(shmobile_boot_vector), sysc + SBAR);
59	iounmap(sysc);
60	iounmap(ap);
61
62	/* setup sh73a0 specific SCU bits */
63	shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
64}
65
66const struct smp_operations sh73a0_smp_ops __initconst = {
67	.smp_prepare_cpus	= sh73a0_smp_prepare_cpus,
68	.smp_boot_secondary	= sh73a0_boot_secondary,
69#ifdef CONFIG_HOTPLUG_CPU
70	.cpu_can_disable	= shmobile_smp_cpu_can_disable,
71	.cpu_die		= shmobile_smp_scu_cpu_die,
72	.cpu_kill		= shmobile_smp_scu_cpu_kill,
73#endif
74};
75