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>

1 files changed, 71 insertions, 0 deletions

diff --git a/arch/arc/plat-tb10x/tb10x.c b/arch/arc/plat-tb10x/tb10x.c
new file mode 100644
index 000000000000..d3567691c7e1
--- /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