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 WUPCR		IOMEM(0xe6151010)
20#define SRESCR		IOMEM(0xe6151018)
21#define PSTR		IOMEM(0xe6151040)
22#define SBAR		IOMEM(0xe6180020)
23#define APARMBAREA	IOMEM(0xe6f10020)
24
25#define SH73A0_SCU_BASE 0xf0000000
26
27static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
28{
29	unsigned int lcpu = cpu_logical_map(cpu);
30
31	if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
32		__raw_writel(1 << lcpu, WUPCR);	/* wake up */
33	else
34		__raw_writel(1 << lcpu, SRESCR);	/* reset */
35
36	return 0;
37}
38
39static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
40{
41	/* Map the reset vector (in headsmp.S) */
42	__raw_writel(0, APARMBAREA);      /* 4k */
43	__raw_writel(__pa(shmobile_boot_vector), SBAR);
44
45	/* setup sh73a0 specific SCU bits */
46	shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
47}
48
49const struct smp_operations sh73a0_smp_ops __initconst = {
50	.smp_prepare_cpus	= sh73a0_smp_prepare_cpus,
51	.smp_boot_secondary	= sh73a0_boot_secondary,
52#ifdef CONFIG_HOTPLUG_CPU
53	.cpu_can_disable	= shmobile_smp_cpu_can_disable,
54	.cpu_die		= shmobile_smp_scu_cpu_die,
55	.cpu_kill		= shmobile_smp_scu_cpu_kill,
56#endif
57};
58