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
32 static 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
45 static 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
66 const 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
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