arch/arm/mach-mvebu/board-v7.c

   1 /*
   2  * Device Tree support for Armada 370 and XP platforms.
   3  *
   4  * Copyright (C) 2012 Marvell
   5  *
   6  * Lior Amsalem <alior@marvell.com>
   7  * Gregory CLEMENT <gregory.clement@free-electrons.com>
   8  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   9  *
  10  * This file is licensed under the terms of the GNU General Public
  11  * License version 2.  This program is licensed "as is" without any
  12  * warranty of any kind, whether express or implied.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/clk-provider.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/io.h>
  21 #include <linux/clocksource.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/mbus.h>
  24 #include <linux/slab.h>
  25 #include <asm/hardware/cache-l2x0.h>
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/time.h>
  29 #include "armada-370-xp.h"
  30 #include "common.h"
  31 #include "coherency.h"
  32 #include "mvebu-soc-id.h"
  33
  34 /*
  35  * Early versions of Armada 375 SoC have a bug where the BootROM
  36  * leaves an external data abort pending. The kernel is hit by this
  37  * data abort as soon as it enters userspace, because it unmasks the
  38  * data aborts at this moment. We register a custom abort handler
  39  * below to ignore the first data abort to work around this
  40  * problem.
  41  */
  42 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
  43                                         struct pt_regs *regs)
  44 {
  45         static int ignore_first;
  46
  47         if (!ignore_first && fsr == 0x1406) {
  48                 ignore_first = 1;
  49                 return 0;
  50         }
  51
  52         return 1;
  53 }
  54
  55 static void __init mvebu_timer_and_clk_init(void)
  56 {
  57         of_clk_init(NULL);
  58         clocksource_of_init();
  59         coherency_init();
  60         BUG_ON(mvebu_mbus_dt_init());
  61 #ifdef CONFIG_CACHE_L2X0
  62         l2x0_of_init(0, ~0UL);
  63 #endif
  64
  65         if (of_machine_is_compatible("marvell,armada375"))
  66                 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
  67                                 "imprecise external abort");
  68 }
  69
  70 static void __init i2c_quirk(void)
  71 {
  72         struct device_node *np;
  73         u32 dev, rev;
  74
  75         /*
  76          * Only revisons more recent than A0 support the offload
  77          * mechanism. We can exit only if we are sure that we can
  78          * get the SoC revision and it is more recent than A0.
  79          */
  80         if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV)
  81                 return;
  82
  83         for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
  84                 struct property *new_compat;
  85
  86                 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
  87
  88                 new_compat->name = kstrdup("compatible", GFP_KERNEL);
  89                 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
  90                 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
  91                                                 GFP_KERNEL);
  92
  93                 of_update_property(np, new_compat);
  94         }
  95         return;
  96 }
  97
  98 static void __init mvebu_dt_init(void)
  99 {
 100         if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
 101                 i2c_quirk();
 102         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 103 }
 104
 105 static const char * const armada_370_xp_dt_compat[] = {
 106         "marvell,armada-370-xp",
 107         NULL,
 108 };
 109
 110 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 111         .smp            = smp_ops(armada_xp_smp_ops),
 112         .init_machine   = mvebu_dt_init,
 113         .init_time      = mvebu_timer_and_clk_init,
 114         .restart        = mvebu_restart,
 115         .dt_compat      = armada_370_xp_dt_compat,
 116 MACHINE_END
 117
 118 static const char * const armada_375_dt_compat[] = {
 119         "marvell,armada375",
 120         NULL,
 121 };
 122
 123 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
 124         .init_time      = mvebu_timer_and_clk_init,
 125         .restart        = mvebu_restart,
 126         .dt_compat      = armada_375_dt_compat,
 127 MACHINE_END