/*
 * Copyright 2012 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 "priv.h"

#include <core/option.h>
#include <subdev/top.h>

void
nvkm_mc_unk260(struct nvkm_device *device, u32 data)
{
        struct nvkm_mc *mc = device->mc;
        if (likely(mc) && mc->func->unk260)
                mc->func->unk260(mc, data);
}

void
nvkm_mc_intr_mask(struct nvkm_device *device, enum nvkm_devidx devidx, bool en)
{
        struct nvkm_mc *mc = device->mc;
        const struct nvkm_mc_map *map;
        if (likely(mc) && mc->func->intr_mask) {
                u32 mask = nvkm_top_intr_mask(device, devidx);
                for (map = mc->func->intr; !mask && map->stat; map++) {
                        if (map->unit == devidx)
                                mask = map->stat;
                }
                mc->func->intr_mask(mc, mask, en ? mask : 0);
        }
}

void
nvkm_mc_intr_unarm(struct nvkm_device *device)
{
        struct nvkm_mc *mc = device->mc;
        if (likely(mc))
                mc->func->intr_unarm(mc);
}

void
nvkm_mc_intr_rearm(struct nvkm_device *device)
{
        struct nvkm_mc *mc = device->mc;
        if (likely(mc))
                mc->func->intr_rearm(mc);
}

static u32
nvkm_mc_intr_stat(struct nvkm_mc *mc)
{
        u32 intr = mc->func->intr_stat(mc);
        if (WARN_ON_ONCE(intr == 0xffffffff))
                intr = 0; /* likely fallen off the bus */
        return intr;
}

void
nvkm_mc_intr(struct nvkm_device *device, bool *handled)
{
        struct nvkm_mc *mc = device->mc;
        struct nvkm_subdev *subdev;
        const struct nvkm_mc_map *map;
        u32 stat, intr;
        u64 subdevs;

        if (unlikely(!mc))
                return;

        intr = nvkm_mc_intr_stat(mc);
        stat = nvkm_top_intr(device, intr, &subdevs);
        while (subdevs) {
                enum nvkm_devidx subidx = __ffs64(subdevs);
                subdev = nvkm_device_subdev(device, subidx);
                if (subdev)
                        nvkm_subdev_intr(subdev);
                subdevs &= ~BIT_ULL(subidx);
        }

        for (map = mc->func->intr; map->stat; map++) {
                if (intr & map->stat) {
                        subdev = nvkm_device_subdev(device, map->unit);
                        if (subdev)
                                nvkm_subdev_intr(subdev);
                        stat &= ~map->stat;
                }
        }

        if (stat)
                nvkm_error(&mc->subdev, "intr %08x\n", stat);
        *handled = intr != 0;

        if (mc->func->intr_hack)
                mc->func->intr_hack(mc, handled);
}

static u32
nvkm_mc_reset_mask(struct nvkm_device *device, bool isauto,
                   enum nvkm_devidx devidx)
{
        struct nvkm_mc *mc = device->mc;
        const struct nvkm_mc_map *map;
        u64 pmc_enable = 0;
        if (likely(mc)) {
                if (!(pmc_enable = nvkm_top_reset(device, devidx))) {
                        for (map = mc->func->reset; map && map->stat; map++) {
                                if (!isauto || !map->noauto) {
                                        if (map->unit == devidx) {
                                                pmc_enable = map->stat;
                                                break;
                                        }
                                }
                        }
                }
        }
        return pmc_enable;
}

void
nvkm_mc_reset(struct nvkm_device *device, enum nvkm_devidx devidx)
{
        u64 pmc_enable = nvkm_mc_reset_mask(device, true, devidx);
        if (pmc_enable) {
                nvkm_mask(device, 0x000200, pmc_enable, 0x00000000);
                nvkm_mask(device, 0x000200, pmc_enable, pmc_enable);
                nvkm_rd32(device, 0x000200);
        }
}

void
nvkm_mc_disable(struct nvkm_device *device, enum nvkm_devidx devidx)
{
        u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
        if (pmc_enable)
                nvkm_mask(device, 0x000200, pmc_enable, 0x00000000);
}

void
nvkm_mc_enable(struct nvkm_device *device, enum nvkm_devidx devidx)
{
        u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
        if (pmc_enable) {
                nvkm_mask(device, 0x000200, pmc_enable, pmc_enable);
                nvkm_rd32(device, 0x000200);
        }
}

bool
nvkm_mc_enabled(struct nvkm_device *device, enum nvkm_devidx devidx)
{
        u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);

        return (pmc_enable != 0) &&
               ((nvkm_rd32(device, 0x000200) & pmc_enable) == pmc_enable);
}


static int
nvkm_mc_fini(struct nvkm_subdev *subdev, bool suspend)
{
        nvkm_mc_intr_unarm(subdev->device);
        return 0;
}

static int
nvkm_mc_init(struct nvkm_subdev *subdev)
{
        struct nvkm_mc *mc = nvkm_mc(subdev);
        if (mc->func->init)
                mc->func->init(mc);
        nvkm_mc_intr_rearm(subdev->device);
        return 0;
}

static void *
nvkm_mc_dtor(struct nvkm_subdev *subdev)
{
        return nvkm_mc(subdev);
}

static const struct nvkm_subdev_func
nvkm_mc = {
        .dtor = nvkm_mc_dtor,
        .init = nvkm_mc_init,
        .fini = nvkm_mc_fini,
};

void
nvkm_mc_ctor(const struct nvkm_mc_func *func, struct nvkm_device *device,
             int index, struct nvkm_mc *mc)
{
        nvkm_subdev_ctor(&nvkm_mc, device, index, &mc->subdev);
        mc->func = func;
}

int
nvkm_mc_new_(const struct nvkm_mc_func *func, struct nvkm_device *device,
             int index, struct nvkm_mc **pmc)
{
        struct nvkm_mc *mc;
        if (!(mc = *pmc = kzalloc(sizeof(*mc), GFP_KERNEL)))
                return -ENOMEM;
        nvkm_mc_ctor(func, device, index, *pmc);
        return 0;
}