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 #include <asm/hardware/cache-l2x0.h>
  27
  28 #include "common.h"
  29
  30 static struct map_desc r8a7740_io_desc[] __initdata = {
  31          /*
  32           * for CPGA/INTC/PFC
  33           * 0xe6000000-0xefffffff -> 0xe6000000-0xefffffff
  34           */
  35         {
  36                 .virtual        = 0xe6000000,
  37                 .pfn            = __phys_to_pfn(0xe6000000),
  38                 .length         = 160 << 20,
  39                 .type           = MT_DEVICE_NONSHARED
  40         },
  41 #ifdef CONFIG_CACHE_L2X0
  42         /*
  43          * for l2x0_init()
  44          * 0xf0100000-0xf0101000 -> 0xf0002000-0xf0003000
  45          */
  46         {
  47                 .virtual        = 0xf0002000,
  48                 .pfn            = __phys_to_pfn(0xf0100000),
  49                 .length         = PAGE_SIZE,
  50                 .type           = MT_DEVICE_NONSHARED
  51         },
  52 #endif
  53 };
  54
  55 static void __init r8a7740_map_io(void)
  56 {
  57         debug_ll_io_init();
  58         iotable_init(r8a7740_io_desc, ARRAY_SIZE(r8a7740_io_desc));
  59 }
  60
  61 /*
  62  * r8a7740 chip has lasting errata on MERAM buffer.
  63  * this is work-around for it.
  64  * see
  65  *      "Media RAM (MERAM)" on r8a7740 documentation
  66  */
  67 #define MEBUFCNTR       0xFE950098
  68 static void __init r8a7740_meram_workaround(void)
  69 {
  70         void __iomem *reg;
  71
  72         reg = ioremap_nocache(MEBUFCNTR, 4);
  73         if (reg) {
  74                 iowrite32(0x01600164, reg);
  75                 iounmap(reg);
  76         }
  77 }
  78
  79 static void __init r8a7740_init_irq_of(void)
  80 {
  81         void __iomem *intc_prio_base = ioremap_nocache(0xe6900010, 0x10);
  82         void __iomem *intc_msk_base = ioremap_nocache(0xe6900040, 0x10);
  83         void __iomem *pfc_inta_ctrl = ioremap_nocache(0xe605807c, 0x4);
  84
  85         irqchip_init();
  86
  87         /* route signals to GIC */
  88         iowrite32(0x0, pfc_inta_ctrl);
  89
  90         /*
  91          * To mask the shared interrupt to SPI 149 we must ensure to set
  92          * PRIO *and* MASK. Else we run into IRQ floods when registering
  93          * the intc_irqpin devices
  94          */
  95         iowrite32(0x0, intc_prio_base + 0x0);
  96         iowrite32(0x0, intc_prio_base + 0x4);
  97         iowrite32(0x0, intc_prio_base + 0x8);
  98         iowrite32(0x0, intc_prio_base + 0xc);
  99         iowrite8(0xff, intc_msk_base + 0x0);
 100         iowrite8(0xff, intc_msk_base + 0x4);
 101         iowrite8(0xff, intc_msk_base + 0x8);
 102         iowrite8(0xff, intc_msk_base + 0xc);
 103
 104         iounmap(intc_prio_base);
 105         iounmap(intc_msk_base);
 106         iounmap(pfc_inta_ctrl);
 107 }
 108
 109 static void __init r8a7740_generic_init(void)
 110 {
 111         r8a7740_meram_workaround();
 112
 113 #ifdef CONFIG_CACHE_L2X0
 114         /* Shared attribute override enable, 32K*8way */
 115         l2x0_init(IOMEM(0xf0002000), 0x00400000, 0xc20f0fff);
 116 #endif
 117         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 118 }
 119
 120 static const char *const r8a7740_boards_compat_dt[] __initconst = {
 121         "renesas,r8a7740",
 122         NULL,
 123 };
 124
 125 DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
 126         .map_io         = r8a7740_map_io,
 127         .init_early     = shmobile_init_delay,
 128         .init_irq       = r8a7740_init_irq_of,
 129         .init_machine   = r8a7740_generic_init,
 130         .init_late      = shmobile_init_late,
 131         .dt_compat      = r8a7740_boards_compat_dt,
 132 MACHINE_END