/*
 * Copyright 2010 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 "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_hw.h"
#include "nouveau_gpio.h"

#include "nv50_display.h"

static int
nv50_gpio_location(int line, u32 *reg, u32 *shift)
{
	const uint32_t nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };

	if (line >= 32)
		return -EINVAL;

	*reg = nv50_gpio_reg[line >> 3];
	*shift = (line & 7) << 2;
	return 0;
}

int
nv50_gpio_drive(struct drm_device *dev, int line, int dir, int out)
{
	u32 reg, shift;

	if (nv50_gpio_location(line, &reg, &shift))
		return -EINVAL;

	nv_mask(dev, reg, 7 << shift, (((dir ^ 1) << 1) | out) << shift);
	return 0;
}

int
nv50_gpio_sense(struct drm_device *dev, int line)
{
	u32 reg, shift;

	if (nv50_gpio_location(line, &reg, &shift))
		return -EINVAL;

	return !!(nv_rd32(dev, reg) & (4 << shift));
}

void
nv50_gpio_irq_enable(struct drm_device *dev, int line, bool on)
{
	u32 reg  = line < 16 ? 0xe050 : 0xe070;
	u32 mask = 0x00010001 << (line & 0xf);

	nv_wr32(dev, reg + 4, mask);
	nv_mask(dev, reg + 0, mask, on ? mask : 0);
}

int
nvd0_gpio_drive(struct drm_device *dev, int line, int dir, int out)
{
	u32 data = ((dir ^ 1) << 13) | (out << 12);
	nv_mask(dev, 0x00d610 + (line * 4), 0x00003000, data);
	nv_mask(dev, 0x00d604, 0x00000001, 0x00000001); /* update? */
	return 0;
}

int
nvd0_gpio_sense(struct drm_device *dev, int line)
{
	return !!(nv_rd32(dev, 0x00d610 + (line * 4)) & 0x00004000);
}

static void
nv50_gpio_isr(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	u32 intr0, intr1 = 0;
	u32 hi, lo;

	intr0 = nv_rd32(dev, 0xe054) & nv_rd32(dev, 0xe050);
	if (dev_priv->chipset >= 0x90)
		intr1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070);

	hi = (intr0 & 0x0000ffff) | (intr1 << 16);
	lo = (intr0 >> 16) | (intr1 & 0xffff0000);
	nouveau_gpio_isr(dev, 0, hi | lo);

	nv_wr32(dev, 0xe054, intr0);
	if (dev_priv->chipset >= 0x90)
		nv_wr32(dev, 0xe074, intr1);
}

int
nv50_gpio_init(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	/* initialise gpios and routing to vbios defaults */
	nouveau_gpio_reset(dev);

	/* disable, and ack any pending gpio interrupts */
	nv_wr32(dev, 0xe050, 0x00000000);
	nv_wr32(dev, 0xe054, 0xffffffff);
	if (dev_priv->chipset >= 0x90) {
		nv_wr32(dev, 0xe070, 0x00000000);
		nv_wr32(dev, 0xe074, 0xffffffff);
	}

	nouveau_irq_register(dev, 21, nv50_gpio_isr);
	return 0;
}

void
nv50_gpio_fini(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	nv_wr32(dev, 0xe050, 0x00000000);
	if (dev_priv->chipset >= 0x90)
		nv_wr32(dev, 0xe070, 0x00000000);
	nouveau_irq_unregister(dev, 21);
}