ARC: [TB10x] Add support for TB10x platform

Infrastructure required to make the Linux kernel compile and boot on the
Abilis Systems TB10x series of SOCs based on ARC700 CPUs:
  - Kmake related files (Kconfig, Makefile, tb10x_defconfig)
  - TB10x platform initialisation

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

3 files changed, 128 insertions, 0 deletions

diff --git a/arch/arc/plat-tb10x/Kconfig b/arch/arc/plat-tb10x/Kconfig
new file mode 100644
index 00000000000..4e121272c4e
--- /dev/null
+++ b/arch/arc/plat-tb10x/Kconfig
@@ -0,0 +1,36 @@
+# Abilis Systems TB10x platform kernel configuration file
+#
+# Author: Christian Ruppert <christian.ruppert@abilis.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+
+menuconfig ARC_PLAT_TB10X
+	bool "Abilis TB10x"
+	select COMMON_CLK
+	select PINCTRL
+	select PINMUX
+	select ARCH_REQUIRE_GPIOLIB
+	help
+	  Support for platforms based on the TB10x home media gateway SOC by
+	  Abilis Systems. TB10x is based on the ARC700 CPU architecture.
+	  Say Y if you are building a kernel for one of the SOCs in this
+	  series (e.g. TB100 or TB101). If in doubt say N.
+
+if ARC_PLAT_TB10X
+
+config GENERIC_GPIO
+	def_bool y
+
+endif
diff --git a/arch/arc/plat-tb10x/Makefile b/arch/arc/plat-tb10x/Makefile
new file mode 100644
index 00000000000..89611d25ef3
--- /dev/null
+++ b/arch/arc/plat-tb10x/Makefile
@@ -0,0 +1,21 @@
+# Abilis Systems TB10x platform Makefile
+#
+# Author: Christian Ruppert <christian.ruppert@abilis.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+
+KBUILD_CFLAGS   += -Iarch/arc/plat-tb10x/include
+
+obj-y += tb10x.o
diff --git a/arch/arc/plat-tb10x/tb10x.c b/arch/arc/plat-tb10x/tb10x.c
new file mode 100644
index 00000000000..d3567691c7e
--- /dev/null
+++ b/arch/arc/plat-tb10x/tb10x.c
@@ -0,0 +1,71 @@
+/*
+ * Abilis Systems TB10x platform initialisation
+ *
+ * Copyright (C) Abilis Systems 2012
+ *
+ * Author: Christian Ruppert <christian.ruppert@abilis.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/clk-provider.h>
+#include <linux/pinctrl/consumer.h>
+
+#include <asm/mach_desc.h>
+
+
+static void __init tb10x_platform_init(void)
+{
+	of_clk_init(NULL);
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static void __init tb10x_platform_late_init(void)
+{
+	struct device_node *dn;
+
+	/*
+	 * Pinctrl documentation recommends setting up the iomux here for
+	 * all modules which don't require control over the pins themselves.
+	 * Modules which need this kind of assistance are compatible with
+	 * "abilis,simple-pinctrl", i.e. we can easily iterate over them.
+	 * TODO: Does this recommended method work cleanly with pins required
+	 * by modules?
+	 */
+	for_each_compatible_node(dn, NULL, "abilis,simple-pinctrl") {
+		struct platform_device *pd = of_find_device_by_node(dn);
+		struct pinctrl *pctl;
+
+		pctl = pinctrl_get_select(&pd->dev, "abilis,simple-default");
+		if (IS_ERR(pctl)) {
+			int ret = PTR_ERR(pctl);
+			dev_err(&pd->dev, "Could not set up pinctrl: %d\n",
+				ret);
+		}
+	}
+}
+
+static const char *tb10x_compat[] __initdata = {
+	"abilis,arc-tb10x",
+	NULL,
+};
+
+MACHINE_START(TB10x, "tb10x")
+	.dt_compat	= tb10x_compat,
+	.init_machine	= tb10x_platform_init,
+	.init_late	= tb10x_platform_late_init,
+MACHINE_END