arch/arm/mach-shmobile/pm-r8a7790.c

   1 /*
   2  * r8a7790 Power management support
   3  *
   4  * Copyright (C) 2013  Renesas Electronics Corporation
   5  * Copyright (C) 2011  Renesas Solutions Corp.
   6  * Copyright (C) 2011  Magnus Damm
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/smp.h>
  15 #include <asm/io.h>
  16 #include "common.h"
  17 #include "pm-rcar.h"
  18 #include "r8a7790.h"
  19
  20 /* RST */
  21 #define RST             0xe6160000
  22 #define CA15BAR         0x0020
  23 #define CA7BAR          0x0030
  24 #define CA15RESCNT      0x0040
  25 #define CA7RESCNT       0x0044
  26
  27 /* On-chip RAM */
  28 #define MERAM          0xe8080000
  29
  30 /* SYSC */
  31 #define SYSCIER 0x0c
  32 #define SYSCIMR 0x10
  33
  34 #if defined(CONFIG_SMP)
  35
  36 static void __init r8a7790_sysc_init(void)
  37 {
  38         void __iomem *base = rcar_sysc_init(0xe6180000);
  39
  40         /* enable all interrupt sources, but do not use interrupt handler */
  41         iowrite32(0x0131000e, base + SYSCIER);
  42         iowrite32(0, base + SYSCIMR);
  43 }
  44
  45 #else /* CONFIG_SMP */
  46
  47 static inline void r8a7790_sysc_init(void) {}
  48
  49 #endif /* CONFIG_SMP */
  50
  51 void __init r8a7790_pm_init(void)
  52 {
  53         void __iomem *p;
  54         u32 bar;
  55         static int once;
  56
  57         if (once++)
  58                 return;
  59
  60         /* MERAM for jump stub, because BAR requires 256KB aligned address */
  61         p = ioremap_nocache(MERAM, shmobile_boot_size);
  62         memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
  63         iounmap(p);
  64
  65         /* setup reset vectors */
  66         p = ioremap_nocache(RST, 0x63);
  67         bar = (MERAM >> 8) & 0xfffffc00;
  68         writel_relaxed(bar, p + CA15BAR);
  69         writel_relaxed(bar, p + CA7BAR);
  70         writel_relaxed(bar | 0x10, p + CA15BAR);
  71         writel_relaxed(bar | 0x10, p + CA7BAR);
  72
  73         /* de-assert reset for all CPUs */
  74         writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000,
  75                        p + CA15RESCNT);
  76         writel_relaxed((readl_relaxed(p + CA7RESCNT) & ~0x0f) | 0x5a5a0000,
  77                        p + CA7RESCNT);
  78         iounmap(p);
  79
  80         r8a7790_sysc_init();
  81         shmobile_smp_apmu_suspend_init();
  82 }