1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c b/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c
new file mode 100644
index 000000000000..acf818c58bf0
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright 2011 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include <subdev/gpio.h>
+#include <subdev/bios.h>
+#include <subdev/bios/gpio.h>
+
+static int
+nouveau_gpio_drive(struct nouveau_gpio *gpio,
+		   int idx, int line, int dir, int out)
+{
+	return gpio->drive ? gpio->drive(gpio, line, dir, out) : -ENODEV;
+}
+
+static int
+nouveau_gpio_sense(struct nouveau_gpio *gpio, int idx, int line)
+{
+	return gpio->sense ? gpio->sense(gpio, line) : -ENODEV;
+}
+
+static int
+nouveau_gpio_find(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
+		  struct dcb_gpio_func *func)
+{
+	if (line == 0xff && tag == 0xff)
+		return -EINVAL;
+
+	if (!dcb_gpio_parse(nouveau_bios(gpio), idx, tag, line, func))
+		return 0;
+
+	/* Apple iMac G4 NV18 */
+	if (nv_device_match(nv_object(gpio), 0x0189, 0x10de, 0x0010)) {
+		if (tag == DCB_GPIO_TVDAC0) {
+			*func = (struct dcb_gpio_func) {
+				.func = DCB_GPIO_TVDAC0,
+				.line = 4,
+				.log[0] = 0,
+				.log[1] = 1,
+			};
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int
+nouveau_gpio_set(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, int state)
+{
+	struct dcb_gpio_func func;
+	int ret;
+
+	ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
+	if (ret == 0) {
+		int dir = !!(func.log[state] & 0x02);
+		int out = !!(func.log[state] & 0x01);
+		ret = nouveau_gpio_drive(gpio, idx, func.line, dir, out);
+	}
+
+	return ret;
+}
+
+static int
+nouveau_gpio_get(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line)
+{
+	struct dcb_gpio_func func;
+	int ret;
+
+	ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
+	if (ret == 0) {
+		ret = nouveau_gpio_sense(gpio, idx, func.line);
+		if (ret >= 0)
+			ret = (ret == (func.log[1] & 1));
+	}
+
+	return ret;
+}
+
+static int
+nouveau_gpio_irq(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, bool on)
+{
+	struct dcb_gpio_func func;
+	int ret;
+
+	ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
+	if (ret == 0) {
+		if (idx == 0 && gpio->irq_enable)
+			gpio->irq_enable(gpio, func.line, on);
+		else
+			ret = -ENODEV;
+	}
+
+	return ret;
+}
+
+struct gpio_isr {
+	struct nouveau_gpio *gpio;
+	struct list_head head;
+	struct work_struct work;
+	int idx;
+	struct dcb_gpio_func func;
+	void (*handler)(void *, int);
+	void *data;
+	bool inhibit;
+};
+
+static void
+nouveau_gpio_isr_bh(struct work_struct *work)
+{
+	struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
+	struct nouveau_gpio *gpio = isr->gpio;
+	unsigned long flags;
+	int state;
+
+	state = nouveau_gpio_get(gpio, isr->idx, isr->func.func,
+						 isr->func.line);
+	if (state >= 0)
+		isr->handler(isr->data, state);
+
+	spin_lock_irqsave(&gpio->lock, flags);
+	isr->inhibit = false;
+	spin_unlock_irqrestore(&gpio->lock, flags);
+}
+
+static void
+nouveau_gpio_isr_run(struct nouveau_gpio *gpio, int idx, u32 line_mask)
+{
+	struct gpio_isr *isr;
+
+	if (idx != 0)
+		return;
+
+	spin_lock(&gpio->lock);
+	list_for_each_entry(isr, &gpio->isr, head) {
+		if (line_mask & (1 << isr->func.line)) {
+			if (isr->inhibit)
+				continue;
+			isr->inhibit = true;
+			schedule_work(&isr->work);
+		}
+	}
+	spin_unlock(&gpio->lock);
+}
+
+static int
+nouveau_gpio_isr_add(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
+		     void (*handler)(void *, int), void *data)
+{
+	struct gpio_isr *isr;
+	unsigned long flags;
+	int ret;
+
+	isr = kzalloc(sizeof(*isr), GFP_KERNEL);
+	if (!isr)
+		return -ENOMEM;
+
+	ret = nouveau_gpio_find(gpio, idx, tag, line, &isr->func);
+	if (ret) {
+		kfree(isr);
+		return ret;
+	}
+
+	INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
+	isr->gpio = gpio;
+	isr->handler = handler;
+	isr->data = data;
+	isr->idx = idx;
+
+	spin_lock_irqsave(&gpio->lock, flags);
+	list_add(&isr->head, &gpio->isr);
+	spin_unlock_irqrestore(&gpio->lock, flags);
+	return 0;
+}
+
+static void
+nouveau_gpio_isr_del(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
+		     void (*handler)(void *, int), void *data)
+{
+	struct gpio_isr *isr, *tmp;
+	struct dcb_gpio_func func;
+	unsigned long flags;
+	LIST_HEAD(tofree);
+	int ret;
+
+	ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
+	if (ret == 0) {
+		spin_lock_irqsave(&gpio->lock, flags);
+		list_for_each_entry_safe(isr, tmp, &gpio->isr, head) {
+			if (memcmp(&isr->func, &func, sizeof(func)) ||
+			    isr->idx != idx ||
+			    isr->handler != handler || isr->data != data)
+				continue;
+			list_move_tail(&isr->head, &tofree);
+		}
+		spin_unlock_irqrestore(&gpio->lock, flags);
+
+		list_for_each_entry_safe(isr, tmp, &tofree, head) {
+			flush_work(&isr->work);
+			kfree(isr);
+		}
+	}
+}
+
+int
+nouveau_gpio_create_(struct nouveau_object *parent,
+		     struct nouveau_object *engine,
+		     struct nouveau_oclass *oclass, int length, void **pobject)
+{
+	struct nouveau_gpio *gpio;
+	int ret;
+
+	ret = nouveau_subdev_create_(parent, engine, oclass, 0, "GPIO", "gpio",
+				     length, pobject);
+	gpio = *pobject;
+	if (ret)
+		return ret;
+
+	gpio->find = nouveau_gpio_find;
+	gpio->set  = nouveau_gpio_set;
+	gpio->get  = nouveau_gpio_get;
+	gpio->irq  = nouveau_gpio_irq;
+	gpio->isr_run = nouveau_gpio_isr_run;
+	gpio->isr_add = nouveau_gpio_isr_add;
+	gpio->isr_del = nouveau_gpio_isr_del;
+	INIT_LIST_HEAD(&gpio->isr);
+	spin_lock_init(&gpio->lock);
+	return 0;
+}
+
+static struct dmi_system_id gpio_reset_ids[] = {
+	{
+		.ident = "Apple Macbook 10,1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"),
+		}
+	},
+	{ }
+};
+
+int
+nouveau_gpio_init(struct nouveau_gpio *gpio)
+{
+	int ret = nouveau_subdev_init(&gpio->base);
+	if (ret == 0 && gpio->reset) {
+		if (dmi_check_system(gpio_reset_ids))
+			gpio->reset(gpio);
+	}
+	return ret;
+}