2 * Device Tree support for Armada 370 and XP platforms.
4 * Copyright (C) 2012 Marvell
6 * Lior Amsalem <alior@marvell.com>
7 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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.
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/of_platform.h>
21 #include <linux/clocksource.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/memblock.h>
24 #include <linux/mbus.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"
34 #include "coherency.h"
35 #include "mvebu-soc-id.h"
37 static void __iomem *scu_base;
40 * Enables the SCU when available. Obviously, this is only useful on
41 * Cortex-A based SOCs, not on PJ4B based ones.
43 static void __init mvebu_scu_enable(void)
45 struct device_node *np =
46 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
48 scu_base = of_iomap(np, 0);
54 void __iomem *mvebu_get_scu_base(void)
60 * When returning from suspend, the platform goes through the
61 * bootloader, which executes its DDR3 training code. This code has
62 * the unfortunate idea of using the first 10 KB of each DRAM bank to
63 * exercise the RAM and calculate the optimal timings. Therefore, this
64 * area of RAM is overwritten, and shouldn't be used by the kernel if
65 * suspend/resume is supported.
69 #define MVEBU_DDR_TRAINING_AREA_SZ (10 * SZ_1K)
70 static int __init mvebu_scan_mem(unsigned long node, const char *uname,
71 int depth, void *data)
73 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
74 const __be32 *reg, *endp;
77 if (type == NULL || strcmp(type, "memory"))
80 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
82 reg = of_get_flat_dt_prop(node, "reg", &l);
86 endp = reg + (l / sizeof(__be32));
87 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
90 base = dt_mem_next_cell(dt_root_addr_cells, ®);
91 size = dt_mem_next_cell(dt_root_size_cells, ®);
93 memblock_reserve(base, MVEBU_DDR_TRAINING_AREA_SZ);
99 static void __init mvebu_memblock_reserve(void)
101 of_scan_flat_dt(mvebu_scan_mem, NULL);
104 static void __init mvebu_memblock_reserve(void) {}
107 static void __init mvebu_init_irq(void)
112 BUG_ON(mvebu_mbus_dt_init(coherency_available()));
115 static void __init i2c_quirk(void)
117 struct device_node *np;
121 * Only revisons more recent than A0 support the offload
122 * mechanism. We can exit only if we are sure that we can
123 * get the SoC revision and it is more recent than A0.
125 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
128 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
129 struct property *new_compat;
131 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
133 new_compat->name = kstrdup("compatible", GFP_KERNEL);
134 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
135 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
138 of_update_property(np, new_compat);
143 static void __init mvebu_dt_init(void)
145 if (of_machine_is_compatible("marvell,armadaxp"))
148 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
151 static const char * const armada_370_xp_dt_compat[] __initconst = {
152 "marvell,armada-370-xp",
156 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
160 * The following field (.smp) is still needed to ensure backward
161 * compatibility with old Device Trees that were not specifying the
162 * cpus enable-method property.
164 .smp = smp_ops(armada_xp_smp_ops),
165 .init_machine = mvebu_dt_init,
166 .init_irq = mvebu_init_irq,
167 .restart = mvebu_restart,
168 .reserve = mvebu_memblock_reserve,
169 .dt_compat = armada_370_xp_dt_compat,
172 static const char * const armada_375_dt_compat[] __initconst = {
177 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
180 .init_irq = mvebu_init_irq,
181 .init_machine = mvebu_dt_init,
182 .restart = mvebu_restart,
183 .dt_compat = armada_375_dt_compat,
186 static const char * const armada_38x_dt_compat[] __initconst = {
192 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
195 .init_irq = mvebu_init_irq,
196 .restart = mvebu_restart,
197 .dt_compat = armada_38x_dt_compat,
200 static const char * const armada_39x_dt_compat[] __initconst = {
206 DT_MACHINE_START(ARMADA_39X_DT, "Marvell Armada 39x (Device Tree)")
209 .init_irq = mvebu_init_irq,
210 .restart = mvebu_restart,
211 .dt_compat = armada_39x_dt_compat,