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/signal.h>
  25 #include <linux/slab.h>
  26 #include <asm/hardware/cache-l2x0.h>
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/map.h>
  29 #include <asm/mach/time.h>
  30 #include <asm/smp_scu.h>
  31 #include "armada-370-xp.h"
  32 #include "common.h"
  33 #include "coherency.h"
  34 #include "mvebu-soc-id.h"
  35
  36 /*
  37  * Enables the SCU when available. Obviously, this is only useful on
  38  * Cortex-A based SOCs, not on PJ4B based ones.
  39  */
  40 static void __init mvebu_scu_enable(void)
  41 {
  42         void __iomem *scu_base;
  43
  44         struct device_node *np =
  45                 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
  46         if (np) {
  47                 scu_base = of_iomap(np, 0);
  48                 scu_enable(scu_base);
  49                 of_node_put(np);
  50         }
  51 }
  52
  53 /*
  54  * Early versions of Armada 375 SoC have a bug where the BootROM
  55  * leaves an external data abort pending. The kernel is hit by this
  56  * data abort as soon as it enters userspace, because it unmasks the
  57  * data aborts at this moment. We register a custom abort handler
  58  * below to ignore the first data abort to work around this
  59  * problem.
  60  */
  61 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
  62                                         struct pt_regs *regs)
  63 {
  64         static int ignore_first;
  65
  66         if (!ignore_first && fsr == 0x1406) {
  67                 ignore_first = 1;
  68                 return 0;
  69         }
  70
  71         return 1;
  72 }
  73
  74 static void __init mvebu_timer_and_clk_init(void)
  75 {
  76         of_clk_init(NULL);
  77         clocksource_of_init();
  78         mvebu_scu_enable();
  79         coherency_init();
  80         BUG_ON(mvebu_mbus_dt_init(coherency_available()));
  81
  82         if (of_machine_is_compatible("marvell,armada375"))
  83                 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
  84                                 "imprecise external abort");
  85 }
  86
  87 static void __init i2c_quirk(void)
  88 {
  89         struct device_node *np;
  90         u32 dev, rev;
  91
  92         /*
  93          * Only revisons more recent than A0 support the offload
  94          * mechanism. We can exit only if we are sure that we can
  95          * get the SoC revision and it is more recent than A0.
  96          */
  97         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
  98                 return;
  99
 100         for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
 101                 struct property *new_compat;
 102
 103                 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
 104
 105                 new_compat->name = kstrdup("compatible", GFP_KERNEL);
 106                 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
 107                 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
 108                                                 GFP_KERNEL);
 109
 110                 of_update_property(np, new_compat);
 111         }
 112         return;
 113 }
 114
 115 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc
 116
 117 static void __init thermal_quirk(void)
 118 {
 119         struct device_node *np;
 120         u32 dev, rev;
 121
 122         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
 123                 return;
 124
 125         for_each_compatible_node(np, NULL, "marvell,armada375-thermal") {
 126                 struct property *prop;
 127                 __be32 newval, *newprop, *oldprop;
 128                 int len;
 129
 130                 /*
 131                  * The register offset is at a wrong location. This quirk
 132                  * creates a new reg property as a clone of the previous
 133                  * one and corrects the offset.
 134                  */
 135                 oldprop = (__be32 *)of_get_property(np, "reg", &len);
 136                 if (!oldprop)
 137                         continue;
 138
 139                 /* Create a duplicate of the 'reg' property */
 140                 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
 141                 prop->length = len;
 142                 prop->name = kstrdup("reg", GFP_KERNEL);
 143                 prop->value = kzalloc(len, GFP_KERNEL);
 144                 memcpy(prop->value, oldprop, len);
 145
 146                 /* Fixup the register offset of the second entry */
 147                 oldprop += 2;
 148                 newprop = (__be32 *)prop->value + 2;
 149                 newval = cpu_to_be32(be32_to_cpu(*oldprop) -
 150                                      A375_Z1_THERMAL_FIXUP_OFFSET);
 151                 *newprop = newval;
 152                 of_update_property(np, prop);
 153
 154                 /*
 155                  * The thermal controller needs some quirk too, so let's change
 156                  * the compatible string to reflect this.
 157                  */
 158                 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
 159                 prop->name = kstrdup("compatible", GFP_KERNEL);
 160                 prop->length = sizeof("marvell,armada375-z1-thermal");
 161                 prop->value = kstrdup("marvell,armada375-z1-thermal",
 162                                                 GFP_KERNEL);
 163                 of_update_property(np, prop);
 164         }
 165         return;
 166 }
 167
 168 static void __init mvebu_dt_init(void)
 169 {
 170         if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
 171                 i2c_quirk();
 172         if (of_machine_is_compatible("marvell,a375-db"))
 173                 thermal_quirk();
 174
 175         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 176 }
 177
 178 static const char * const armada_370_xp_dt_compat[] = {
 179         "marvell,armada-370-xp",
 180         NULL,
 181 };
 182
 183 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 184         .l2c_aux_val    = 0,
 185         .l2c_aux_mask   = ~0,
 186         .smp            = smp_ops(armada_xp_smp_ops),
 187         .init_machine   = mvebu_dt_init,
 188         .init_time      = mvebu_timer_and_clk_init,
 189         .restart        = mvebu_restart,
 190         .dt_compat      = armada_370_xp_dt_compat,
 191 MACHINE_END
 192
 193 static const char * const armada_375_dt_compat[] = {
 194         "marvell,armada375",
 195         NULL,
 196 };
 197
 198 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
 199         .l2c_aux_val    = 0,
 200         .l2c_aux_mask   = ~0,
 201         .init_time      = mvebu_timer_and_clk_init,
 202         .init_machine   = mvebu_dt_init,
 203         .restart        = mvebu_restart,
 204         .dt_compat      = armada_375_dt_compat,
 205 MACHINE_END
 206
 207 static const char * const armada_38x_dt_compat[] = {
 208         "marvell,armada380",
 209         "marvell,armada385",
 210         NULL,
 211 };
 212
 213 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
 214         .l2c_aux_val    = 0,
 215         .l2c_aux_mask   = ~0,
 216         .init_time      = mvebu_timer_and_clk_init,
 217         .restart        = mvebu_restart,
 218         .dt_compat      = armada_38x_dt_compat,
 219 MACHINE_END