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/clk-provider.h>
18 #include <linux/of_address.h>
19 #include <linux/of_platform.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"
33 #include "coherency.h"
34 #include "mvebu-soc-id.h"
37 * Enables the SCU when available. Obviously, this is only useful on
38 * Cortex-A based SOCs, not on PJ4B based ones.
40 static void __init mvebu_scu_enable(void)
42 void __iomem *scu_base;
44 struct device_node *np =
45 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
47 scu_base = of_iomap(np, 0);
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
61 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
64 static int ignore_first;
66 if (!ignore_first && fsr == 0x1406) {
74 static void __init mvebu_timer_and_clk_init(void)
77 clocksource_of_init();
80 BUG_ON(mvebu_mbus_dt_init(coherency_available()));
81 l2x0_of_init(0, ~0UL);
83 if (of_machine_is_compatible("marvell,armada375"))
84 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
85 "imprecise external abort");
88 static void __init i2c_quirk(void)
90 struct device_node *np;
94 * Only revisons more recent than A0 support the offload
95 * mechanism. We can exit only if we are sure that we can
96 * get the SoC revision and it is more recent than A0.
98 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
101 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
102 struct property *new_compat;
104 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
106 new_compat->name = kstrdup("compatible", GFP_KERNEL);
107 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
108 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
111 of_update_property(np, new_compat);
116 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc
118 static void __init thermal_quirk(void)
120 struct device_node *np;
123 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
126 for_each_compatible_node(np, NULL, "marvell,armada375-thermal") {
127 struct property *prop;
128 __be32 newval, *newprop, *oldprop;
132 * The register offset is at a wrong location. This quirk
133 * creates a new reg property as a clone of the previous
134 * one and corrects the offset.
136 oldprop = (__be32 *)of_get_property(np, "reg", &len);
140 /* Create a duplicate of the 'reg' property */
141 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
143 prop->name = kstrdup("reg", GFP_KERNEL);
144 prop->value = kzalloc(len, GFP_KERNEL);
145 memcpy(prop->value, oldprop, len);
147 /* Fixup the register offset of the second entry */
149 newprop = (__be32 *)prop->value + 2;
150 newval = cpu_to_be32(be32_to_cpu(*oldprop) -
151 A375_Z1_THERMAL_FIXUP_OFFSET);
153 of_update_property(np, prop);
156 * The thermal controller needs some quirk too, so let's change
157 * the compatible string to reflect this.
159 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
160 prop->name = kstrdup("compatible", GFP_KERNEL);
161 prop->length = sizeof("marvell,armada375-z1-thermal");
162 prop->value = kstrdup("marvell,armada375-z1-thermal",
164 of_update_property(np, prop);
169 static void __init mvebu_dt_init(void)
171 if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
173 if (of_machine_is_compatible("marvell,a375-db"))
176 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
179 static const char * const armada_370_xp_dt_compat[] = {
180 "marvell,armada-370-xp",
184 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
185 .smp = smp_ops(armada_xp_smp_ops),
186 .init_machine = mvebu_dt_init,
187 .init_time = mvebu_timer_and_clk_init,
188 .restart = mvebu_restart,
189 .dt_compat = armada_370_xp_dt_compat,
192 static const char * const armada_375_dt_compat[] = {
197 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
198 .init_time = mvebu_timer_and_clk_init,
199 .init_machine = mvebu_dt_init,
200 .restart = mvebu_restart,
201 .dt_compat = armada_375_dt_compat,
204 static const char * const armada_38x_dt_compat[] = {
210 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
211 .init_time = mvebu_timer_and_clk_init,
212 .restart = mvebu_restart,
213 .dt_compat = armada_38x_dt_compat,