drivers: of: Add snapshot of of_slimbus driver

Add snapshot of of_slimbus driver from msm-3.18 tree.
3.18 baseline
e70ad0cd5efdd9dc91a77dcdac31d6132e1315c1

Change-Id: I1bd2a767b238b4cf0184bc778940cd3a9eef2e9b
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>

drivers/of/Kconfig

@@ -102,6 +102,12 @@ config OF_RESERVED_MEM
 config OF_RESOLVE
 	bool
 
+config OF_SLIMBUS
+	def_tristate SLIMBUS
+	depends on SLIMBUS
+	help
+	  OpenFirmware SLIMBUS accessors
+
 config OF_OVERLAY
 	bool "Device Tree overlays"
 	select OF_DYNAMIC

drivers/of/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_OF_MTD)	+= of_mtd.o
 obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
+obj-$(CONFIG_OF_SLIMBUS)        += of_slimbus.o
 obj-$(CONFIG_OF_BATTERYDATA) += of_batterydata.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/

drivers/of/of_slimbus.c

@@ -0,0 +1,90 @@
+/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+/* OF helpers for SLIMbus */
+#include <linux/slimbus/slimbus.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_slimbus.h>
+
+int of_register_slim_devices(struct slim_controller *ctrl)
+{
+	struct device_node *node;
+	struct slim_boardinfo *binfo = NULL;
+	struct slim_boardinfo *temp;
+	int n = 0;
+	int ret = 0;
+
+	if (!ctrl->dev.of_node)
+		return -EINVAL;
+
+	for_each_child_of_node(ctrl->dev.of_node, node) {
+		struct property *prop;
+		struct slim_device *slim;
+		char *name;
+		prop = of_find_property(node, "elemental-addr", NULL);
+		if (!prop || prop->length != 6) {
+			dev_err(&ctrl->dev, "of_slim: invalid E-addr");
+			continue;
+		}
+		name = kzalloc(SLIMBUS_NAME_SIZE, GFP_KERNEL);
+		if (!name) {
+			dev_err(&ctrl->dev, "of_slim: out of memory");
+			ret = -ENOMEM;
+			goto of_slim_err;
+		}
+		if (of_modalias_node(node, name, SLIMBUS_NAME_SIZE) < 0) {
+			dev_err(&ctrl->dev, "of_slim: modalias failure on %s\n",
+				node->full_name);
+			kfree(name);
+			continue;
+		}
+		slim = kzalloc(sizeof(struct slim_device), GFP_KERNEL);
+		if (!slim) {
+			dev_err(&ctrl->dev, "of_slim: out of memory");
+			ret = -ENOMEM;
+			kfree(name);
+			goto of_slim_err;
+		}
+		memcpy(slim->e_addr, prop->value, 6);
+
+		temp = krealloc(binfo, (n + 1) * sizeof(struct slim_boardinfo),
+					GFP_KERNEL);
+		if (!temp) {
+			dev_err(&ctrl->dev, "out of memory");
+			kfree(name);
+			kfree(slim);
+			ret = -ENOMEM;
+			goto of_slim_err;
+		}
+		binfo = temp;
+
+		slim->dev.of_node = of_node_get(node);
+		slim->name = (const char *)name;
+		binfo[n].bus_num = ctrl->nr;
+		binfo[n].slim_slave = slim;
+		n++;
+	}
+	ret = slim_register_board_info(binfo, n);
+	if (!ret)
+		goto of_slim_ret;
+of_slim_err:
+	while (n-- > 0) {
+		kfree(binfo[n].slim_slave->name);
+		kfree(binfo[n].slim_slave);
+	}
+of_slim_ret:
+	kfree(binfo);
+	return ret;
+}