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/of_address.h>
  18 #include <linux/of_fdt.h>
  19 #include <linux/io.h>
  20 #include <linux/clocksource.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/memblock.h>
  23 #include <linux/mbus.h>
  24 #include <linux/slab.h>
  25 #include <linux/irqchip.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 static void __iomem *scu_base;
  37
  38 /*
  39  * Enables the SCU when available. Obviously, this is only useful on
  40  * Cortex-A based SOCs, not on PJ4B based ones.
  41  */
  42 static void __init mvebu_scu_enable(void)
  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 void __iomem *mvebu_get_scu_base(void)
  54 {
  55         return scu_base;
  56 }
  57
  58 /*
  59  * When returning from suspend, the platform goes through the
  60  * bootloader, which executes its DDR3 training code. This code has
  61  * the unfortunate idea of using the first 10 KB of each DRAM bank to
  62  * exercise the RAM and calculate the optimal timings. Therefore, this
  63  * area of RAM is overwritten, and shouldn't be used by the kernel if
  64  * suspend/resume is supported.
  65  */
  66
  67 #ifdef CONFIG_SUSPEND
  68 #define MVEBU_DDR_TRAINING_AREA_SZ (10 * SZ_1K)
  69 static int __init mvebu_scan_mem(unsigned long node, const char *uname,
  70                                  int depth, void *data)
  71 {
  72         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
  73         const __be32 *reg, *endp;
  74         int l;
  75
  76         if (type == NULL || strcmp(type, "memory"))
  77                 return 0;
  78
  79         reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
  80         if (reg == NULL)
  81                 reg = of_get_flat_dt_prop(node, "reg", &l);
  82         if (reg == NULL)
  83                 return 0;
  84
  85         endp = reg + (l / sizeof(__be32));
  86         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
  87                 u64 base, size;
  88
  89                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
  90                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
  91
  92                 memblock_reserve(base, MVEBU_DDR_TRAINING_AREA_SZ);
  93         }
  94
  95         return 0;
  96 }
  97
  98 static void __init mvebu_memblock_reserve(void)
  99 {
 100         of_scan_flat_dt(mvebu_scan_mem, NULL);
 101 }
 102 #else
 103 static void __init mvebu_memblock_reserve(void) {}
 104 #endif
 105
 106 static void __init mvebu_init_irq(void)
 107 {
 108         irqchip_init();
 109         mvebu_scu_enable();
 110         coherency_init();
 111         BUG_ON(mvebu_mbus_dt_init(coherency_available()));
 112 }
 113
 114 static void __init i2c_quirk(void)
 115 {
 116         struct device_node *np;
 117         u32 dev, rev;
 118
 119         /*
 120          * Only revisons more recent than A0 support the offload
 121          * mechanism. We can exit only if we are sure that we can
 122          * get the SoC revision and it is more recent than A0.
 123          */
 124         if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
 125                 return;
 126
 127         for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
 128                 struct property *new_compat;
 129
 130                 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
 131
 132                 new_compat->name = kstrdup("compatible", GFP_KERNEL);
 133                 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
 134                 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
 135                                                 GFP_KERNEL);
 136
 137                 of_update_property(np, new_compat);
 138         }
 139         return;
 140 }
 141
 142 static void __init mvebu_dt_init(void)
 143 {
 144         if (of_machine_is_compatible("marvell,armadaxp"))
 145                 i2c_quirk();
 146 }
 147
 148 static const char * const armada_370_xp_dt_compat[] __initconst = {
 149         "marvell,armada-370-xp",
 150         NULL,
 151 };
 152
 153 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 154         .l2c_aux_val    = 0,
 155         .l2c_aux_mask   = ~0,
 156 /*
 157  * The following field (.smp) is still needed to ensure backward
 158  * compatibility with old Device Trees that were not specifying the
 159  * cpus enable-method property.
 160  */
 161         .smp            = smp_ops(armada_xp_smp_ops),
 162         .init_machine   = mvebu_dt_init,
 163         .init_irq       = mvebu_init_irq,
 164         .restart        = mvebu_restart,
 165         .reserve        = mvebu_memblock_reserve,
 166         .dt_compat      = armada_370_xp_dt_compat,
 167 MACHINE_END
 168
 169 static const char * const armada_375_dt_compat[] __initconst = {
 170         "marvell,armada375",
 171         NULL,
 172 };
 173
 174 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
 175         .l2c_aux_val    = 0,
 176         .l2c_aux_mask   = ~0,
 177         .init_irq       = mvebu_init_irq,
 178         .init_machine   = mvebu_dt_init,
 179         .restart        = mvebu_restart,
 180         .dt_compat      = armada_375_dt_compat,
 181 MACHINE_END
 182
 183 static const char * const armada_38x_dt_compat[] __initconst = {
 184         "marvell,armada380",
 185         "marvell,armada385",
 186         NULL,
 187 };
 188
 189 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
 190         .l2c_aux_val    = 0,
 191         .l2c_aux_mask   = ~0,
 192         .init_irq       = mvebu_init_irq,
 193         .restart        = mvebu_restart,
 194         .dt_compat      = armada_38x_dt_compat,
 195 MACHINE_END
 196
 197 static const char * const armada_39x_dt_compat[] __initconst = {
 198         "marvell,armada390",
 199         "marvell,armada398",
 200         NULL,
 201 };
 202
 203 DT_MACHINE_START(ARMADA_39X_DT, "Marvell Armada 39x (Device Tree)")
 204         .l2c_aux_val    = 0,
 205         .l2c_aux_mask   = ~0,
 206         .init_irq       = mvebu_init_irq,
 207         .restart        = mvebu_restart,
 208         .dt_compat      = armada_39x_dt_compat,
 209 MACHINE_END