1 /*
2  * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
3  *
4  * Copyright (C) 2010  Magnus Damm
5  * Copyright (C) 2010  Takashi Yoshii
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; version 2 of the License.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  */
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/io.h>
20 #include <linux/delay.h>
21 
22 #include <asm/smp_plat.h>
23 #include <asm/smp_twd.h>
24 
25 #include "common.h"
26 #include "sh73a0.h"
27 
28 #define WUPCR		IOMEM(0xe6151010)
29 #define SRESCR		IOMEM(0xe6151018)
30 #define PSTR		IOMEM(0xe6151040)
31 #define SBAR		IOMEM(0xe6180020)
32 #define APARMBAREA	IOMEM(0xe6f10020)
33 
34 #define SH73A0_SCU_BASE 0xf0000000
35 
36 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
37 {
38 	unsigned int lcpu = cpu_logical_map(cpu);
39 
40 	if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
41 		__raw_writel(1 << lcpu, WUPCR);	/* wake up */
42 	else
43 		__raw_writel(1 << lcpu, SRESCR);	/* reset */
44 
45 	return 0;
46 }
47 
48 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
49 {
50 	/* Map the reset vector (in headsmp.S) */
51 	__raw_writel(0, APARMBAREA);      /* 4k */
52 	__raw_writel(__pa(shmobile_boot_vector), SBAR);
53 
54 	/* setup sh73a0 specific SCU bits */
55 	shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
56 	shmobile_smp_scu_prepare_cpus(max_cpus);
57 }
58 
59 struct smp_operations sh73a0_smp_ops __initdata = {
60 	.smp_prepare_cpus	= sh73a0_smp_prepare_cpus,
61 	.smp_boot_secondary	= sh73a0_boot_secondary,
62 #ifdef CONFIG_HOTPLUG_CPU
63 	.cpu_can_disable	= shmobile_smp_cpu_can_disable,
64 	.cpu_die		= shmobile_smp_scu_cpu_die,
65 	.cpu_kill		= shmobile_smp_scu_cpu_kill,
66 #endif
67 };
68