arch/arm/mach-shmobile/pm-r8a7791.c

   1 /*
   2  * r8a7791 Power management support
   3  *
   4  * Copyright (C) 2014  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 "r8a7791.h"
  19
  20 #define RST             0xe6160000
  21 #define CA15BAR         0x0020
  22 #define CA15RESCNT      0x0040
  23 #define RAM             0xe6300000
  24
  25 /* SYSC */
  26 #define SYSCIER 0x0c
  27 #define SYSCIMR 0x10
  28
  29 #if defined(CONFIG_SMP)
  30
  31 static void __init r8a7791_sysc_init(void)
  32 {
  33         void __iomem *base = rcar_sysc_init(0xe6180000);
  34
  35         /* enable all interrupt sources, but do not use interrupt handler */
  36         iowrite32(0x0131000e, base + SYSCIER);
  37         iowrite32(0, base + SYSCIMR);
  38 }
  39
  40 #else /* CONFIG_SMP */
  41
  42 static inline void r8a7791_sysc_init(void) {}
  43
  44 #endif /* CONFIG_SMP */
  45
  46 void __init r8a7791_pm_init(void)
  47 {
  48         void __iomem *p;
  49         u32 bar;
  50         static int once;
  51
  52         if (once++)
  53                 return;
  54
  55         /* RAM for jump stub, because BAR requires 256KB aligned address */
  56         p = ioremap_nocache(RAM, shmobile_boot_size);
  57         memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
  58         iounmap(p);
  59
  60         /* setup reset vectors */
  61         p = ioremap_nocache(RST, 0x63);
  62         bar = (RAM >> 8) & 0xfffffc00;
  63         writel_relaxed(bar, p + CA15BAR);
  64         writel_relaxed(bar | 0x10, p + CA15BAR);
  65
  66         /* enable clocks to all CPUs */
  67         writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000,
  68                        p + CA15RESCNT);
  69         iounmap(p);
  70
  71         r8a7791_sysc_init();
  72         shmobile_smp_apmu_suspend_init();
  73 }