<= div dir=3D"ltr">On Mon, Nov 12, 2018 at 3:26 PM Christian Svensson <bluecmd@google.com> wrote:

Without this IO mapping= early printk will simply not work after the
paging and MMU has been setup.

This patch maps all the whole 0x1e600000 IO space to 0xfe600000.

Signed-off-by: Christian Svensson <bluecmd@google.com>
---
=C2=A0arch/arm/Makefile=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0|=C2=A0 1 +
=C2=A0arch/arm/mach-aspeed/Makefile=C2=A0 =C2=A0 =C2=A0|=C2=A0 1 +
=C2=A0arch/arm/mach-aspeed/aspeed_soc.c | 47 ++++++++++++++++++++++++++++++= +
=C2=A0arch/arm/mach-aspeed/iomap.h=C2=A0 =C2=A0 =C2=A0 | 17 +++++++++++
=C2=A04 files changed, 66 insertions(+)
=C2=A0create mode 100644 arch/arm/mach-aspeed/Makefile
=C2=A0create mode 100644 arch/arm/mach-aspeed/aspeed_soc.c
=C2=A0create mode 100644 arch/arm/mach-aspeed/iomap.h

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index fc26c3d7b9b6..f0e3ca392f8c 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -159,6 +159,7 @@ textofs-$(CONFIG_ARCH_AXXIA) :=3D 0x00308000
=C2=A0machine-$(CONFIG_ARCH_ACTIONS)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+=3D = actions
=C2=A0machine-$(CONFIG_ARCH_ALPINE)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +=3D = alpine
=C2=A0machine-$(CONFIG_ARCH_ARTPEC)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +=3D = artpec
+machine-$(CONFIG_ARCH_ASPEED)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +=3D aspee= d
=C2=A0machine-$(CONFIG_ARCH_AT91)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = +=3D at91
=C2=A0machine-$(CONFIG_ARCH_AXXIA)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= +=3D axxia
=C2=A0machine-$(CONFIG_ARCH_BCM)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0+=3D bcm
diff --git a/arch/arm/mach-aspeed/Makefile b/arch/arm/mach-aspeed/Makefile<= br> new file mode 100644
index 000000000000..426952d47cc3
--- /dev/null
+++ b/arch/arm/mach-aspeed/Makefile
@@ -0,0 +1 @@
+obj-y :=3D aspeed_soc.o
diff --git a/arch/arm/mach-aspeed/aspeed_soc.c b/arch/arm/mach-aspeed/aspee= d_soc.c
new file mode 100644
index 000000000000..187276c2813d
--- /dev/null
+++ b/arch/arm/mach-aspeed/aspeed_soc.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=C2=A0 See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include "iomap.h"
+
+// This is needed for e.g. earlyprintk
+static struct map_desc io_desc[] __initdata =3D {
+=C2=A0 =C2=A0 =C2=A0 =C2=A0{
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0.virtual =3D AST_IO= _VIRT,
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0.pfn =3D __phys_to_= pfn(AST_IO_PHYS),
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0.length =3D AST_IO_= SIZE,
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0.type =3D MT_DEVICE=
+=C2=A0 =C2=A0 =C2=A0 =C2=A0}
+};
+
+static void __init aspeed_map_io(void)
+{
+=C2=A0 =C2=A0 =C2=A0 =C2=A0iotable_init(io_desc, ARRAY_SIZE(io_desc));
+}
+
+static const char * const aspeed_compat[] =3D {
+=C2=A0 =C2=A0 =C2=A0 =C2=A0"aspeed,ast2400",
+=C2=A0 =C2=A0 =C2=A0 =C2=A0"aspeed,ast2500",
+=C2=A0 =C2=A0 =C2=A0 =C2=A0NULL
+};
+
+DT_MACHINE_START(ASPEED_DT, "Aspeed SoC")
+=C2=A0 =C2=A0 =C2=A0 =C2=A0.map_io =3D aspeed_map_io,
+=C2=A0 =C2=A0 =C2=A0 =C2=A0.dt_compat =3D aspeed_compat,
+MACHINE_END
diff --git a/arch/arm/mach-aspeed/iomap.h b/arch/arm/mach-aspeed/iomap.h new file mode 100644
index 000000000000..7ea5276f3892
--- /dev/null
+++ b/arch/arm/mach-aspeed/iomap.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2018 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=C2=A0 See the
+ * GNU General Public License for more details.
+ */
+
+#define AST_IO_PHYS 0x1e600000
+#define AST_IO_VIRT 0xfe600000
+#define AST_IO_SIZE 0x00200000
--
2.19.1.930.g4563a0d9d0-goog