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 <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"
38 * Enables the SCU when available. Obviously, this is only useful on
39 * Cortex-A based SOCs, not on PJ4B based ones.
41 static void __init mvebu_scu_enable(void)
43 void __iomem *scu_base;
45 struct device_node *np =
46 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
48 scu_base = of_iomap(np, 0);
55 * Early versions of Armada 375 SoC have a bug where the BootROM
56 * leaves an external data abort pending. The kernel is hit by this
57 * data abort as soon as it enters userspace, because it unmasks the
58 * data aborts at this moment. We register a custom abort handler
59 * below to ignore the first data abort to work around this
62 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
65 static int ignore_first;
67 if (!ignore_first && fsr == 0x1406) {
75 static void __init mvebu_init_irq(void)
80 BUG_ON(mvebu_mbus_dt_init(coherency_available()));
83 static void __init external_abort_quirk(void)
87 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
90 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
91 "imprecise external abort");
94 static void __init i2c_quirk(void)
96 struct device_node *np;
100 * Only revisons more recent than A0 support the offload
101 * mechanism. We can exit only if we are sure that we can
102 * get the SoC revision and it is more recent than A0.
104 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
107 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
108 struct property *new_compat;
110 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
112 new_compat->name = kstrdup("compatible", GFP_KERNEL);
113 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
114 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
117 of_update_property(np, new_compat);
122 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc
124 static void __init thermal_quirk(void)
126 struct device_node *np;
131 * The early SoC Z1 revision needs a quirk to be applied in order
132 * for the thermal controller to work properly. This quirk breaks
133 * the thermal support if applied on a SoC that doesn't need it,
134 * so we enforce the SoC revision to be known.
136 res = mvebu_get_soc_id(&dev, &rev);
137 if (res < 0 || (res == 0 && rev > ARMADA_375_Z1_REV))
140 for_each_compatible_node(np, NULL, "marvell,armada375-thermal") {
141 struct property *prop;
142 __be32 newval, *newprop, *oldprop;
146 * The register offset is at a wrong location. This quirk
147 * creates a new reg property as a clone of the previous
148 * one and corrects the offset.
150 oldprop = (__be32 *)of_get_property(np, "reg", &len);
154 /* Create a duplicate of the 'reg' property */
155 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
157 prop->name = kstrdup("reg", GFP_KERNEL);
158 prop->value = kzalloc(len, GFP_KERNEL);
159 memcpy(prop->value, oldprop, len);
161 /* Fixup the register offset of the second entry */
163 newprop = (__be32 *)prop->value + 2;
164 newval = cpu_to_be32(be32_to_cpu(*oldprop) -
165 A375_Z1_THERMAL_FIXUP_OFFSET);
167 of_update_property(np, prop);
170 * The thermal controller needs some quirk too, so let's change
171 * the compatible string to reflect this and allow the driver
172 * the take the necessary action.
174 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
175 prop->name = kstrdup("compatible", GFP_KERNEL);
176 prop->length = sizeof("marvell,armada375-z1-thermal");
177 prop->value = kstrdup("marvell,armada375-z1-thermal",
179 of_update_property(np, prop);
184 static void __init mvebu_dt_init(void)
186 if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
188 if (of_machine_is_compatible("marvell,a375-db")) {
189 external_abort_quirk();
193 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
196 static const char * const armada_370_xp_dt_compat[] = {
197 "marvell,armada-370-xp",
201 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
204 .smp = smp_ops(armada_xp_smp_ops),
205 .init_machine = mvebu_dt_init,
206 .init_irq = mvebu_init_irq,
207 .restart = mvebu_restart,
208 .dt_compat = armada_370_xp_dt_compat,
211 static const char * const armada_375_dt_compat[] = {
216 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
219 .init_irq = mvebu_init_irq,
220 .init_machine = mvebu_dt_init,
221 .restart = mvebu_restart,
222 .dt_compat = armada_375_dt_compat,
225 static const char * const armada_38x_dt_compat[] = {
231 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
234 .init_irq = mvebu_init_irq,
235 .restart = mvebu_restart,
236 .dt_compat = armada_38x_dt_compat,