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
sh73a0_boot_secondary(unsigned int cpu,struct task_struct * idle)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
sh73a0_smp_prepare_cpus(unsigned int max_cpus)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