arch/arm/mach-shmobile/setup-r8a7740.c

   1 /*
   2  * R8A7740 processor support
   3  *
   4  * Copyright (C) 2011  Renesas Solutions Corp.
   5  * Copyright (C) 2011  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   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/io.h>
  19 #include <linux/irqchip.h>
  20 #include <linux/irqchip/arm-gic.h>
  21 #include <linux/of_platform.h>
  22
  23 #include <asm/mach/map.h>
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/time.h>
  26
  27 #include "common.h"
  28
  29 /*
  30  * r8a7740 chip has lasting errata on MERAM buffer.
  31  * this is work-around for it.
  32  * see
  33  *      "Media RAM (MERAM)" on r8a7740 documentation
  34  */
  35 #define MEBUFCNTR       0xFE950098
  36 static void __init r8a7740_meram_workaround(void)
  37 {
  38         void __iomem *reg;
  39
  40         reg = ioremap_nocache(MEBUFCNTR, 4);
  41         if (reg) {
  42                 iowrite32(0x01600164, reg);
  43                 iounmap(reg);
  44         }
  45 }
  46
  47 static void __init r8a7740_init_irq_of(void)
  48 {
  49         void __iomem *intc_prio_base = ioremap_nocache(0xe6900010, 0x10);
  50         void __iomem *intc_msk_base = ioremap_nocache(0xe6900040, 0x10);
  51         void __iomem *pfc_inta_ctrl = ioremap_nocache(0xe605807c, 0x4);
  52
  53         irqchip_init();
  54
  55         /* route signals to GIC */
  56         iowrite32(0x0, pfc_inta_ctrl);
  57
  58         /*
  59          * To mask the shared interrupt to SPI 149 we must ensure to set
  60          * PRIO *and* MASK. Else we run into IRQ floods when registering
  61          * the intc_irqpin devices
  62          */
  63         iowrite32(0x0, intc_prio_base + 0x0);
  64         iowrite32(0x0, intc_prio_base + 0x4);
  65         iowrite32(0x0, intc_prio_base + 0x8);
  66         iowrite32(0x0, intc_prio_base + 0xc);
  67         iowrite8(0xff, intc_msk_base + 0x0);
  68         iowrite8(0xff, intc_msk_base + 0x4);
  69         iowrite8(0xff, intc_msk_base + 0x8);
  70         iowrite8(0xff, intc_msk_base + 0xc);
  71
  72         iounmap(intc_prio_base);
  73         iounmap(intc_msk_base);
  74         iounmap(pfc_inta_ctrl);
  75 }
  76
  77 static void __init r8a7740_generic_init(void)
  78 {
  79         r8a7740_meram_workaround();
  80
  81         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  82 }
  83
  84 static const char *const r8a7740_boards_compat_dt[] __initconst = {
  85         "renesas,r8a7740",
  86         NULL,
  87 };
  88
  89 DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
  90         .l2c_aux_val    = 0,
  91         .l2c_aux_mask   = ~0,
  92         .init_early     = shmobile_init_delay,
  93         .init_irq       = r8a7740_init_irq_of,
  94         .init_machine   = r8a7740_generic_init,
  95         .init_late      = shmobile_init_late,
  96         .dt_compat      = r8a7740_boards_compat_dt,
  97 MACHINE_END