xref: /openbmc/linux/drivers/gpu/drm/nouveau/nvkm/subdev/bus/nv04.c (revision d0034a7a4ac7fae708146ac0059b9c47a1543f0d)

/*
 * Copyright 2012 Nouveau Community
 *
 * 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: Martin Peres <martin.peres@labri.fr>
 *          Ben Skeggs
 */
#include "priv.h"

#include <subdev/gpio.h>

static void
nv04_bus_intr(struct nvkm_bus *bus)
{
	struct nvkm_subdev *subdev = &bus->subdev;
	struct nvkm_device *device = subdev->device;
	u32 stat = nvkm_rd32(device, 0x001100) & nvkm_rd32(device, 0x001140);

	if (stat & 0x00000001) {
		nvkm_error(subdev, "BUS ERROR\n");
		stat &= ~0x00000001;
		nvkm_wr32(device, 0x001100, 0x00000001);
	}

	if (stat & 0x00000110) {
		struct nvkm_gpio *gpio = device->gpio;
		if (gpio)
			nvkm_subdev_intr(&gpio->subdev);
		stat &= ~0x00000110;
		nvkm_wr32(device, 0x001100, 0x00000110);
	}

	if (stat) {
		nvkm_error(subdev, "intr %08x\n", stat);
		nvkm_mask(device, 0x001140, stat, 0x00000000);
	}
}

static void
nv04_bus_init(struct nvkm_bus *bus)
{
	struct nvkm_device *device = bus->subdev.device;
	nvkm_wr32(device, 0x001100, 0xffffffff);
	nvkm_wr32(device, 0x001140, 0x00000111);
}

static const struct nvkm_bus_func
nv04_bus = {
	.init = nv04_bus_init,
	.intr = nv04_bus_intr,
};

int
nv04_bus_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	     struct nvkm_bus **pbus)
{
	return nvkm_bus_new_(&nv04_bus, device, type, inst, pbus);
}