[PATCH] linux: arch: define aspeed SOC IO mapping

* [PATCH] linux: arch: define aspeed SOC IO mapping
@ 2018-11-12 14:25 Christian Svensson
  2019-01-11 12:30 ` Christian Svensson
  0 siblings, 1 reply; 2+ messages in thread
From: Christian Svensson @ 2018-11-12 14:25 UTC (permalink / raw)
  To: openbmc; +Cc: blue, joel, andrew, clg, Christian Svensson

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>
---
 arch/arm/Makefile                 |  1 +
 arch/arm/mach-aspeed/Makefile     |  1 +
 arch/arm/mach-aspeed/aspeed_soc.c | 47 +++++++++++++++++++++++++++++++
 arch/arm/mach-aspeed/iomap.h      | 17 +++++++++++
 4 files changed, 66 insertions(+)
 create mode 100644 arch/arm/mach-aspeed/Makefile
 create mode 100644 arch/arm/mach-aspeed/aspeed_soc.c
 create 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-$(CONFIG_ARCH_AXXIA) := 0x00308000
 machine-$(CONFIG_ARCH_ACTIONS)		+= actions
 machine-$(CONFIG_ARCH_ALPINE)		+= alpine
 machine-$(CONFIG_ARCH_ARTPEC)		+= artpec
+machine-$(CONFIG_ARCH_ASPEED)		+= aspeed
 machine-$(CONFIG_ARCH_AT91)		+= at91
 machine-$(CONFIG_ARCH_AXXIA)		+= axxia
 machine-$(CONFIG_ARCH_BCM)		+= bcm
diff --git a/arch/arm/mach-aspeed/Makefile b/arch/arm/mach-aspeed/Makefile
new file mode 100644
index 000000000000..426952d47cc3
--- /dev/null
+++ b/arch/arm/mach-aspeed/Makefile
@@ -0,0 +1 @@
+obj-y := aspeed_soc.o
diff --git a/arch/arm/mach-aspeed/aspeed_soc.c b/arch/arm/mach-aspeed/aspeed_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.  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 = {
+	{
+		.virtual = AST_IO_VIRT,
+		.pfn = __phys_to_pfn(AST_IO_PHYS),
+		.length = AST_IO_SIZE,
+		.type = MT_DEVICE
+	}
+};
+
+static void __init aspeed_map_io(void)
+{
+	iotable_init(io_desc, ARRAY_SIZE(io_desc));
+}
+
+static const char * const aspeed_compat[] = {
+	"aspeed,ast2400",
+	"aspeed,ast2500",
+	NULL
+};
+
+DT_MACHINE_START(ASPEED_DT, "Aspeed SoC")
+	.map_io = aspeed_map_io,
+	.dt_compat = 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.  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

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