From: kettenis <kettenis@openbsd.org>
Date: Mon, 11 Jul 2016 14:49:41 +0000 (+0000)
Subject: Add a simple framework for handling gpio controllers and pins on FDT-enabled
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=d4ed4044b79d4cc695505ed34c26df74745edef5;p=openbsd

Add a simple framework for handling gpio controllers and pins on FDT-enabled
platforms.

ok visa@, jsg@
---

diff --git a/sys/dev/ofw/ofw_gpio.c b/sys/dev/ofw/ofw_gpio.c
new file mode 100644
index 00000000000..668210ae955
--- /dev/null
+++ b/sys/dev/ofw/ofw_gpio.c
@@ -0,0 +1,84 @@
+/*	$OpenBSD: ofw_gpio.c,v 1.1 2016/07/11 14:49:41 kettenis Exp $	*/
+/*
+ * Copyright (c) 2016 Mark Kettenis
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/systm.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_gpio.h>
+
+LIST_HEAD(, gpio_controller) gpio_controllers =
+	LIST_HEAD_INITIALIZER(gpio_controllers);
+
+void
+gpio_controller_register(struct gpio_controller *gc)
+{
+	gc->gc_cells = OF_getpropint(gc->gc_node, "#gpio-cells", 2);
+	gc->gc_phandle = OF_getpropint(gc->gc_node, "phandle", 0);
+	if (gc->gc_phandle == 0)
+		return;
+
+	LIST_INSERT_HEAD(&gpio_controllers, gc, gc_list);
+}
+
+void
+gpio_controller_config_pin(uint32_t *cells, int config)
+{
+	struct gpio_controller *gc;
+	uint32_t phandle = cells[0];
+
+	LIST_FOREACH(gc, &gpio_controllers, gc_list) {
+		if (gc->gc_phandle == phandle)
+			break;
+	}
+
+	if (gc && gc->gc_config_pin)
+		gc->gc_config_pin(gc->gc_cookie, &cells[1], config);
+}
+
+int
+gpio_controller_get_pin(uint32_t *cells)
+{
+	struct gpio_controller *gc;
+	uint32_t phandle = cells[0];
+	int val = 0;
+
+	LIST_FOREACH(gc, &gpio_controllers, gc_list) {
+		if (gc->gc_phandle == phandle)
+			break;
+	}
+
+	if (gc && gc->gc_get_pin)
+		val = gc->gc_get_pin(gc->gc_cookie, &cells[1]);
+
+	return val;
+}
+
+void
+gpio_controller_set_pin(uint32_t *cells, int val)
+{
+	struct gpio_controller *gc;
+	uint32_t phandle = cells[0];
+
+	LIST_FOREACH(gc, &gpio_controllers, gc_list) {
+		if (gc->gc_phandle == phandle)
+			break;
+	}
+
+	if (gc && gc->gc_set_pin)
+		gc->gc_set_pin(gc->gc_cookie, &cells[1], val);
+}
diff --git a/sys/dev/ofw/ofw_gpio.h b/sys/dev/ofw/ofw_gpio.h
new file mode 100644
index 00000000000..52f00b0f530
--- /dev/null
+++ b/sys/dev/ofw/ofw_gpio.h
@@ -0,0 +1,45 @@
+/*	$OpenBSD: ofw_gpio.h,v 1.1 2016/07/11 14:49:41 kettenis Exp $	*/
+/*
+ * Copyright (c) 2016 Mark Kettenis
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _DEV_OFW_GPIO_H_
+#define _DEV_OFW_GPIO_H_
+
+#define GPIO_ACTIVE_HIGH	0
+#define GPIO_ACTIVE_LOW		1
+
+struct gpio_controller {
+	int	gc_node;
+	void	*gc_cookie;
+	void	(*gc_config_pin)(void *, uint32_t *, int);
+	int	(*gc_get_pin)(void *, uint32_t *);
+	void	(*gc_set_pin)(void *, uint32_t *, int);
+
+	LIST_ENTRY(gpio_controller) gc_list;
+	uint32_t gc_phandle;
+	uint32_t gc_cells;
+};
+
+void	gpio_controller_register(struct gpio_controller *);
+
+#define GPIO_CONFIG_INPUT	0x0000
+#define GPIO_CONFIG_OUTPUT	0x0001
+void	gpio_controller_config_pin(uint32_t *, int);
+
+int	gpio_controller_get_pin(uint32_t *);
+void	gpio_controller_set_pin(uint32_t *, int);
+
+#endif /* _DEV_OFW_GPIO_H_ */