Blame view

kernel/linux-rt-4.4.41/arch/arm/mach-shmobile/smp-sh73a0.c 1.9 KB
5113f6f70   김현기   kernel add
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
  /*
   * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
   *
   * Copyright (C) 2010  Magnus Damm
   * Copyright (C) 2010  Takashi Yoshii
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; version 2 of the License.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/smp.h>
  #include <linux/io.h>
  #include <linux/delay.h>
  
  #include <asm/smp_plat.h>
  #include <asm/smp_twd.h>
  
  #include "common.h"
  #include "sh73a0.h"
  
  #define WUPCR		IOMEM(0xe6151010)
  #define SRESCR		IOMEM(0xe6151018)
  #define PSTR		IOMEM(0xe6151040)
  #define SBAR		IOMEM(0xe6180020)
  #define APARMBAREA	IOMEM(0xe6f10020)
  
  #define SH73A0_SCU_BASE 0xf0000000
  
  static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
  {
  	unsigned int lcpu = cpu_logical_map(cpu);
  
  	if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
  		__raw_writel(1 << lcpu, WUPCR);	/* wake up */
  	else
  		__raw_writel(1 << lcpu, SRESCR);	/* reset */
  
  	return 0;
  }
  
  static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
  {
  	/* Map the reset vector (in headsmp.S) */
  	__raw_writel(0, APARMBAREA);      /* 4k */
  	__raw_writel(__pa(shmobile_boot_vector), SBAR);
  
  	/* setup sh73a0 specific SCU bits */
  	shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
  	shmobile_smp_scu_prepare_cpus(max_cpus);
  }
  
  struct smp_operations sh73a0_smp_ops __initdata = {
  	.smp_prepare_cpus	= sh73a0_smp_prepare_cpus,
  	.smp_boot_secondary	= sh73a0_boot_secondary,
  #ifdef CONFIG_HOTPLUG_CPU
  	.cpu_can_disable	= shmobile_smp_cpu_can_disable,
  	.cpu_die		= shmobile_smp_scu_cpu_die,
  	.cpu_kill		= shmobile_smp_scu_cpu_kill,
  #endif
  };