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 
27 static 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 
39 static 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 
49 const 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