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"
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 * Early versions of Armada 375 SoC have a bug where the BootROM
61 * leaves an external data abort pending. The kernel is hit by this
62 * data abort as soon as it enters userspace, because it unmasks the
63 * data aborts at this moment. We register a custom abort handler
64 * below to ignore the first data abort to work around this
67 static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
70 static int ignore_first;
72 if (!ignore_first && fsr == 0x1406) {
80 static void __init mvebu_init_irq(void)
85 BUG_ON(mvebu_mbus_dt_init(coherency_available()));
88 static void __init external_abort_quirk(void)
92 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > ARMADA_375_Z1_REV)
95 hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
96 "imprecise external abort");
99 static void __init i2c_quirk(void)
101 struct device_node *np;
105 * Only revisons more recent than A0 support the offload
106 * mechanism. We can exit only if we are sure that we can
107 * get the SoC revision and it is more recent than A0.
109 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
112 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
113 struct property *new_compat;
115 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
117 new_compat->name = kstrdup("compatible", GFP_KERNEL);
118 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
119 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
122 of_update_property(np, new_compat);
127 #define A375_Z1_THERMAL_FIXUP_OFFSET 0xc
129 static void __init thermal_quirk(void)
131 struct device_node *np;
136 * The early SoC Z1 revision needs a quirk to be applied in order
137 * for the thermal controller to work properly. This quirk breaks
138 * the thermal support if applied on a SoC that doesn't need it,
139 * so we enforce the SoC revision to be known.
141 res = mvebu_get_soc_id(&dev, &rev);
142 if (res < 0 || (res == 0 && rev > ARMADA_375_Z1_REV))
145 for_each_compatible_node(np, NULL, "marvell,armada375-thermal") {
146 struct property *prop;
147 __be32 newval, *newprop, *oldprop;
151 * The register offset is at a wrong location. This quirk
152 * creates a new reg property as a clone of the previous
153 * one and corrects the offset.
155 oldprop = (__be32 *)of_get_property(np, "reg", &len);
159 /* Create a duplicate of the 'reg' property */
160 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
162 prop->name = kstrdup("reg", GFP_KERNEL);
163 prop->value = kzalloc(len, GFP_KERNEL);
164 memcpy(prop->value, oldprop, len);
166 /* Fixup the register offset of the second entry */
168 newprop = (__be32 *)prop->value + 2;
169 newval = cpu_to_be32(be32_to_cpu(*oldprop) -
170 A375_Z1_THERMAL_FIXUP_OFFSET);
172 of_update_property(np, prop);
175 * The thermal controller needs some quirk too, so let's change
176 * the compatible string to reflect this and allow the driver
177 * the take the necessary action.
179 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
180 prop->name = kstrdup("compatible", GFP_KERNEL);
181 prop->length = sizeof("marvell,armada375-z1-thermal");
182 prop->value = kstrdup("marvell,armada375-z1-thermal",
184 of_update_property(np, prop);
189 static void __init mvebu_dt_init(void)
191 if (of_machine_is_compatible("marvell,armadaxp"))
193 if (of_machine_is_compatible("marvell,a375-db")) {
194 external_abort_quirk();
198 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
201 static const char * const armada_370_xp_dt_compat[] = {
202 "marvell,armada-370-xp",
206 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
209 .smp = smp_ops(armada_xp_smp_ops),
210 .init_machine = mvebu_dt_init,
211 .init_irq = mvebu_init_irq,
212 .restart = mvebu_restart,
213 .dt_compat = armada_370_xp_dt_compat,
216 static const char * const armada_375_dt_compat[] = {
221 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
224 .init_irq = mvebu_init_irq,
225 .init_machine = mvebu_dt_init,
226 .restart = mvebu_restart,
227 .dt_compat = armada_375_dt_compat,
230 static const char * const armada_38x_dt_compat[] = {
236 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
239 .init_irq = mvebu_init_irq,
240 .restart = mvebu_restart,
241 .dt_compat = armada_38x_dt_compat,