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_fdt.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/io.h>
  22 #include <linux/clocksource.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/memblock.h>
  25 #include <linux/mbus.h>
  26 #include <linux/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/irqchip.h>
  29 #include <asm/hardware/cache-l2x0.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/map.h>
  32 #include <asm/mach/time.h>
  33 #include <asm/smp_scu.h>
  34 #include "armada-370-xp.h"
  35 #include "common.h"
  36 #include "coherency.h"
  37 #include "mvebu-soc-id.h"
  38
  39 static void __iomem *scu_base;
  40
  41 /*
  42  * Enables the SCU when available. Obviously, this is only useful on
  43  * Cortex-A based SOCs, not on PJ4B based ones.
  44  */
  45 static void __init mvebu_scu_enable(void)
  46 {
  47         struct device_node *np =
  48                 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
  49         if (np) {
  50                 scu_base = of_iomap(np, 0);
  51                 scu_enable(scu_base);
  52                 of_node_put(np);
  53         }
  54 }
  55
  56 void __iomem *mvebu_get_scu_base(void)
  57 {
  58         return scu_base;
  59 }
  60
  61 /*
  62  * When returning from suspend, the platform goes through the
  63  * bootloader, which executes its DDR3 training code. This code has
  64  * the unfortunate idea of using the first 10 KB of each DRAM bank to
  65  * exercise the RAM and calculate the optimal timings. Therefore, this
  66  * area of RAM is overwritten, and shouldn't be used by the kernel if
  67  * suspend/resume is supported.
  68  */
  69
  70 #ifdef CONFIG_SUSPEND
  71 #define MVEBU_DDR_TRAINING_AREA_SZ (10 * SZ_1K)
  72 static int __init mvebu_scan_mem(unsigned long node, const char *uname,
  73                                  int depth, void *data)
  74 {
  75         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
  76         const __be32 *reg, *endp;
  77         int l;
  78
  79         if (type == NULL || strcmp(type, "memory"))
  80                 return 0;
  81
  82         reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
  83         if (reg == NULL)
  84                 reg = of_get_flat_dt_prop(node, "reg", &l);
  85         if (reg == NULL)
  86                 return 0;
  87
  88         endp = reg + (l / sizeof(__be32));
  89         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
  90                 u64 base, size;
  91
  92                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
  93                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
  94
  95                 memblock_reserve(base, MVEBU_DDR_TRAINING_AREA_SZ);
  96         }
  97
  98         return 0;
  99 }
 100
 101 static void __init mvebu_memblock_reserve(void)
 102 {
 103         of_scan_flat_dt(mvebu_scan_mem, NULL);
 104 }
 105 #else
 106 static void __init mvebu_memblock_reserve(void) {}
 107 #endif
 108
 109 /*
 110  * Early versions of Armada 375 SoC have a bug where the BootROM
 111  * leaves an external data abort pending. The kernel is hit by this
 112  * data abort as soon as it enters userspace, because it unmasks the
 113  * data aborts at this moment. We register a custom abort handler
 114  * below to ignore the first data abort to work around this
 115  * problem.
 116  */
 117 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
 118                                         struct pt_regs *regs)
 119 {
 120         static int ignore_first;
 121
 122         if (!ignore_first && fsr == 0x1406) {
 123                 ignore_first = 1;
 124                 return 0;
 125         }
 126
 127         return 1;
 128 }
 129
 130 static void __init mvebu_init_irq(void)
 131 {
 132         irqchip_init();
 133         mvebu_scu_enable();
 134         coherency_init();
 135         BUG_ON(mvebu_mbus_dt_init(coherency_available()));
 136 }
 137
 138 static void __init external_abort_quirk(void)
 139 {
 140         u32 dev, rev;
 141
 142         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
 143                 return;
 144
 145         hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
 146                         "imprecise external abort");
 147 }
 148
 149 static void __init i2c_quirk(void)
 150 {
 151         struct device_node *np;
 152         u32 dev, rev;
 153
 154         /*
 155          * Only revisons more recent than A0 support the offload
 156          * mechanism. We can exit only if we are sure that we can
 157          * get the SoC revision and it is more recent than A0.
 158          */
 159         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
 160                 return;
 161
 162         for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
 163                 struct property *new_compat;
 164
 165                 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
 166
 167                 new_compat->name = kstrdup("compatible", GFP_KERNEL);
 168                 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
 169                 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
 170                                                 GFP_KERNEL);
 171
 172                 of_update_property(np, new_compat);
 173         }
 174         return;
 175 }
 176
 177 static void __init mvebu_dt_init(void)
 178 {
 179         if (of_machine_is_compatible("marvell,armadaxp"))
 180                 i2c_quirk();
 181         if (of_machine_is_compatible("marvell,a375-db"))
 182                 external_abort_quirk();
 183
 184         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 185 }
 186
 187 static const char * const armada_370_xp_dt_compat[] __initconst = {
 188         "marvell,armada-370-xp",
 189         NULL,
 190 };
 191
 192 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 193         .l2c_aux_val    = 0,
 194         .l2c_aux_mask   = ~0,
 195 /*
 196  * The following field (.smp) is still needed to ensure backward
 197  * compatibility with old Device Trees that were not specifying the
 198  * cpus enable-method property.
 199  */
 200         .smp            = smp_ops(armada_xp_smp_ops),
 201         .init_machine   = mvebu_dt_init,
 202         .init_irq       = mvebu_init_irq,
 203         .restart        = mvebu_restart,
 204         .reserve        = mvebu_memblock_reserve,
 205         .dt_compat      = armada_370_xp_dt_compat,
 206 MACHINE_END
 207
 208 static const char * const armada_375_dt_compat[] __initconst = {
 209         "marvell,armada375",
 210         NULL,
 211 };
 212
 213 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
 214         .l2c_aux_val    = 0,
 215         .l2c_aux_mask   = ~0,
 216         .init_irq       = mvebu_init_irq,
 217         .init_machine   = mvebu_dt_init,
 218         .restart        = mvebu_restart,
 219         .dt_compat      = armada_375_dt_compat,
 220 MACHINE_END
 221
 222 static const char * const armada_38x_dt_compat[] __initconst = {
 223         "marvell,armada380",
 224         "marvell,armada385",
 225         NULL,
 226 };
 227
 228 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
 229         .l2c_aux_val    = 0,
 230         .l2c_aux_mask   = ~0,
 231         .init_irq       = mvebu_init_irq,
 232         .restart        = mvebu_restart,
 233         .dt_compat      = armada_38x_dt_compat,
 234 MACHINE_END
 235
 236 static const char * const armada_39x_dt_compat[] __initconst = {
 237         "marvell,armada390",
 238         "marvell,armada398",
 239         NULL,
 240 };
 241
 242 DT_MACHINE_START(ARMADA_39X_DT, "Marvell Armada 39x (Device Tree)")
 243         .l2c_aux_val    = 0,
 244         .l2c_aux_mask   = ~0,
 245         .init_irq       = mvebu_init_irq,
 246         .restart        = mvebu_restart,
 247         .dt_compat      = armada_39x_dt_compat,
 248 MACHINE_END