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 <linux/irqchip.h>
  27 #include <asm/hardware/cache-l2x0.h>
  28 #include <asm/mach/arch.h>
  29 #include <asm/mach/map.h>
  30 #include <asm/mach/time.h>
  31 #include <asm/smp_scu.h>
  32 #include "armada-370-xp.h"
  33 #include "common.h"
  34 #include "coherency.h"
  35 #include "mvebu-soc-id.h"
  36
  37 static void __iomem *scu_base;
  38
  39 /*
  40  * Enables the SCU when available. Obviously, this is only useful on
  41  * Cortex-A based SOCs, not on PJ4B based ones.
  42  */
  43 static void __init mvebu_scu_enable(void)
  44 {
  45         struct device_node *np =
  46                 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
  47         if (np) {
  48                 scu_base = of_iomap(np, 0);
  49                 scu_enable(scu_base);
  50                 of_node_put(np);
  51         }
  52 }
  53
  54 void __iomem *mvebu_get_scu_base(void)
  55 {
  56         return scu_base;
  57 }
  58
  59 /*
  60  * Early versions of Armada 375 SoC have a bug where the BootROM
  61  * leaves an external data abort pending. The kernel is hit by this
  62  * data abort as soon as it enters userspace, because it unmasks the
  63  * data aborts at this moment. We register a custom abort handler
  64  * below to ignore the first data abort to work around this
  65  * problem.
  66  */
  67 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
  68                                         struct pt_regs *regs)
  69 {
  70         static int ignore_first;
  71
  72         if (!ignore_first && fsr == 0x1406) {
  73                 ignore_first = 1;
  74                 return 0;
  75         }
  76
  77         return 1;
  78 }
  79
  80 static void __init mvebu_init_irq(void)
  81 {
  82         irqchip_init();
  83         mvebu_scu_enable();
  84         coherency_init();
  85         BUG_ON(mvebu_mbus_dt_init(coherency_available()));
  86 }
  87
  88 static void __init external_abort_quirk(void)
  89 {
  90         u32 dev, rev;
  91
  92         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
  93                 return;
  94
  95         hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
  96                         "imprecise external abort");
  97 }
  98
  99 static void __init i2c_quirk(void)
 100 {
 101         struct device_node *np;
 102         u32 dev, rev;
 103
 104         /*
 105          * Only revisons more recent than A0 support the offload
 106          * mechanism. We can exit only if we are sure that we can
 107          * get the SoC revision and it is more recent than A0.
 108          */
 109         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
 110                 return;
 111
 112         for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
 113                 struct property *new_compat;
 114
 115                 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
 116
 117                 new_compat->name = kstrdup("compatible", GFP_KERNEL);
 118                 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
 119                 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
 120                                                 GFP_KERNEL);
 121
 122                 of_update_property(np, new_compat);
 123         }
 124         return;
 125 }
 126
 127 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc
 128
 129 static void __init thermal_quirk(void)
 130 {
 131         struct device_node *np;
 132         u32 dev, rev;
 133         int res;
 134
 135         /*
 136          * The early SoC Z1 revision needs a quirk to be applied in order
 137          * for the thermal controller to work properly. This quirk breaks
 138          * the thermal support if applied on a SoC that doesn't need it,
 139          * so we enforce the SoC revision to be known.
 140          */
 141         res = mvebu_get_soc_id(&dev, &rev);
 142         if (res < 0 || (res == 0 && rev > ARMADA_375_Z1_REV))
 143                 return;
 144
 145         for_each_compatible_node(np, NULL, "marvell,armada375-thermal") {
 146                 struct property *prop;
 147                 __be32 newval, *newprop, *oldprop;
 148                 int len;
 149
 150                 /*
 151                  * The register offset is at a wrong location. This quirk
 152                  * creates a new reg property as a clone of the previous
 153                  * one and corrects the offset.
 154                  */
 155                 oldprop = (__be32 *)of_get_property(np, "reg", &len);
 156                 if (!oldprop)
 157                         continue;
 158
 159                 /* Create a duplicate of the 'reg' property */
 160                 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
 161                 prop->length = len;
 162                 prop->name = kstrdup("reg", GFP_KERNEL);
 163                 prop->value = kzalloc(len, GFP_KERNEL);
 164                 memcpy(prop->value, oldprop, len);
 165
 166                 /* Fixup the register offset of the second entry */
 167                 oldprop += 2;
 168                 newprop = (__be32 *)prop->value + 2;
 169                 newval = cpu_to_be32(be32_to_cpu(*oldprop) -
 170                                      A375_Z1_THERMAL_FIXUP_OFFSET);
 171                 *newprop = newval;
 172                 of_update_property(np, prop);
 173
 174                 /*
 175                  * The thermal controller needs some quirk too, so let's change
 176                  * the compatible string to reflect this and allow the driver
 177                  * the take the necessary action.
 178                  */
 179                 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
 180                 prop->name = kstrdup("compatible", GFP_KERNEL);
 181                 prop->length = sizeof("marvell,armada375-z1-thermal");
 182                 prop->value = kstrdup("marvell,armada375-z1-thermal",
 183                                                 GFP_KERNEL);
 184                 of_update_property(np, prop);
 185         }
 186         return;
 187 }
 188
 189 static void __init mvebu_dt_init(void)
 190 {
 191         if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
 192                 i2c_quirk();
 193         if (of_machine_is_compatible("marvell,a375-db")) {
 194                 external_abort_quirk();
 195                 thermal_quirk();
 196         }
 197
 198         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 199 }
 200
 201 static const char * const armada_370_xp_dt_compat[] = {
 202         "marvell,armada-370-xp",
 203         NULL,
 204 };
 205
 206 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 207         .l2c_aux_val    = 0,
 208         .l2c_aux_mask   = ~0,
 209         .smp            = smp_ops(armada_xp_smp_ops),
 210         .init_machine   = mvebu_dt_init,
 211         .init_irq       = mvebu_init_irq,
 212         .restart        = mvebu_restart,
 213         .dt_compat      = armada_370_xp_dt_compat,
 214 MACHINE_END
 215
 216 static const char * const armada_375_dt_compat[] = {
 217         "marvell,armada375",
 218         NULL,
 219 };
 220
 221 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
 222         .l2c_aux_val    = 0,
 223         .l2c_aux_mask   = ~0,
 224         .init_irq       = mvebu_init_irq,
 225         .init_machine   = mvebu_dt_init,
 226         .restart        = mvebu_restart,
 227         .dt_compat      = armada_375_dt_compat,
 228 MACHINE_END
 229
 230 static const char * const armada_38x_dt_compat[] = {
 231         "marvell,armada380",
 232         "marvell,armada385",
 233         NULL,
 234 };
 235
 236 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
 237         .l2c_aux_val    = 0,
 238         .l2c_aux_mask   = ~0,
 239         .init_irq       = mvebu_init_irq,
 240         .restart        = mvebu_restart,
 241         .dt_compat      = armada_38x_dt_compat,
 242 MACHINE_END