/*
 * 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 "nv04.h"
#include "channv04.h"
#include "regsnv04.h"

#include <core/client.h>
#include <core/ramht.h>
#include <subdev/instmem.h>
#include <subdev/timer.h>
#include <engine/sw.h>

static const struct nv04_fifo_ramfc
nv04_fifo_ramfc[] = {
        { 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
        { 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
        { 16,  0, 0x08,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
        { 16, 16, 0x08,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
        { 32,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_STATE },
        { 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
        { 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_ENGINE },
        { 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_PULL1 },
        {}
};

void
nv04_fifo_pause(struct nvkm_fifo *base, unsigned long *pflags)
__acquires(fifo->base.lock)
{
        struct nv04_fifo *fifo = nv04_fifo(base);
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        unsigned long flags;

        spin_lock_irqsave(&fifo->base.lock, flags);
        *pflags = flags;

        nvkm_wr32(device, NV03_PFIFO_CACHES, 0x00000000);
        nvkm_mask(device, NV04_PFIFO_CACHE1_PULL0, 0x00000001, 0x00000000);

        /* in some cases the puller may be left in an inconsistent state
         * if you try to stop it while it's busy translating handles.
         * sometimes you get a CACHE_ERROR, sometimes it just fails
         * silently; sending incorrect instance offsets to PGRAPH after
         * it's started up again.
         *
         * to avoid this, we invalidate the most recently calculated
         * instance.
         */
        nvkm_msec(device, 2000,
                u32 tmp = nvkm_rd32(device, NV04_PFIFO_CACHE1_PULL0);
                if (!(tmp & NV04_PFIFO_CACHE1_PULL0_HASH_BUSY))
                        break;
        );

        if (nvkm_rd32(device, NV04_PFIFO_CACHE1_PULL0) &
                          NV04_PFIFO_CACHE1_PULL0_HASH_FAILED)
                nvkm_wr32(device, NV03_PFIFO_INTR_0, NV_PFIFO_INTR_CACHE_ERROR);

        nvkm_wr32(device, NV04_PFIFO_CACHE1_HASH, 0x00000000);
}

void
nv04_fifo_start(struct nvkm_fifo *base, unsigned long *pflags)
__releases(fifo->base.lock)
{
        struct nv04_fifo *fifo = nv04_fifo(base);
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        unsigned long flags = *pflags;

        nvkm_mask(device, NV04_PFIFO_CACHE1_PULL0, 0x00000001, 0x00000001);
        nvkm_wr32(device, NV03_PFIFO_CACHES, 0x00000001);

        spin_unlock_irqrestore(&fifo->base.lock, flags);
}

static const char *
nv_dma_state_err(u32 state)
{
        static const char * const desc[] = {
                "NONE", "CALL_SUBR_ACTIVE", "INVALID_MTHD", "RET_SUBR_INACTIVE",
                "INVALID_CMD", "IB_EMPTY"/* NV50+ */, "MEM_FAULT", "UNK"
        };
        return desc[(state >> 29) & 0x7];
}

static bool
nv04_fifo_swmthd(struct nvkm_device *device, u32 chid, u32 addr, u32 data)
{
        struct nvkm_sw *sw = device->sw;
        const int subc = (addr & 0x0000e000) >> 13;
        const int mthd = (addr & 0x00001ffc);
        const u32 mask = 0x0000000f << (subc * 4);
        u32 engine = nvkm_rd32(device, 0x003280);
        bool handled = false;

        switch (mthd) {
        case 0x0000 ... 0x0000: /* subchannel's engine -> software */
                nvkm_wr32(device, 0x003280, (engine &= ~mask));
                fallthrough;
        case 0x0180 ... 0x01fc: /* handle -> instance */
                data = nvkm_rd32(device, 0x003258) & 0x0000ffff;
                fallthrough;
        case 0x0100 ... 0x017c:
        case 0x0200 ... 0x1ffc: /* pass method down to sw */
                if (!(engine & mask) && sw)
                        handled = nvkm_sw_mthd(sw, chid, subc, mthd, data);
                break;
        default:
                break;
        }

        return handled;
}

static void
nv04_fifo_cache_error(struct nv04_fifo *fifo, u32 chid, u32 get)
{
        struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
        struct nvkm_device *device = subdev->device;
        struct nvkm_fifo_chan *chan;
        unsigned long flags;
        u32 pull0 = nvkm_rd32(device, 0x003250);
        u32 mthd, data;
        int ptr;

        /* NV_PFIFO_CACHE1_GET actually goes to 0xffc before wrapping on my
         * G80 chips, but CACHE1 isn't big enough for this much data.. Tests
         * show that it wraps around to the start at GET=0x800.. No clue as to
         * why..
         */
        ptr = (get & 0x7ff) >> 2;

        if (device->card_type < NV_40) {
                mthd = nvkm_rd32(device, NV04_PFIFO_CACHE1_METHOD(ptr));
                data = nvkm_rd32(device, NV04_PFIFO_CACHE1_DATA(ptr));
        } else {
                mthd = nvkm_rd32(device, NV40_PFIFO_CACHE1_METHOD(ptr));
                data = nvkm_rd32(device, NV40_PFIFO_CACHE1_DATA(ptr));
        }

        if (!(pull0 & 0x00000100) ||
            !nv04_fifo_swmthd(device, chid, mthd, data)) {
                chan = nvkm_fifo_chan_chid(&fifo->base, chid, &flags);
                nvkm_error(subdev, "CACHE_ERROR - "
                           "ch %d [%s] subc %d mthd %04x data %08x\n",
                           chid, chan ? chan->object.client->name : "unknown",
                           (mthd >> 13) & 7, mthd & 0x1ffc, data);
                nvkm_fifo_chan_put(&fifo->base, flags, &chan);
        }

        nvkm_wr32(device, NV04_PFIFO_CACHE1_DMA_PUSH, 0);
        nvkm_wr32(device, NV03_PFIFO_INTR_0, NV_PFIFO_INTR_CACHE_ERROR);

        nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH0,
                nvkm_rd32(device, NV03_PFIFO_CACHE1_PUSH0) & ~1);
        nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, get + 4);
        nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH0,
                nvkm_rd32(device, NV03_PFIFO_CACHE1_PUSH0) | 1);
        nvkm_wr32(device, NV04_PFIFO_CACHE1_HASH, 0);

        nvkm_wr32(device, NV04_PFIFO_CACHE1_DMA_PUSH,
                nvkm_rd32(device, NV04_PFIFO_CACHE1_DMA_PUSH) | 1);
        nvkm_wr32(device, NV04_PFIFO_CACHE1_PULL0, 1);
}

static void
nv04_fifo_dma_pusher(struct nv04_fifo *fifo, u32 chid)
{
        struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
        struct nvkm_device *device = subdev->device;
        u32 dma_get = nvkm_rd32(device, 0x003244);
        u32 dma_put = nvkm_rd32(device, 0x003240);
        u32 push = nvkm_rd32(device, 0x003220);
        u32 state = nvkm_rd32(device, 0x003228);
        struct nvkm_fifo_chan *chan;
        unsigned long flags;
        const char *name;

        chan = nvkm_fifo_chan_chid(&fifo->base, chid, &flags);
        name = chan ? chan->object.client->name : "unknown";
        if (device->card_type == NV_50) {
                u32 ho_get = nvkm_rd32(device, 0x003328);
                u32 ho_put = nvkm_rd32(device, 0x003320);
                u32 ib_get = nvkm_rd32(device, 0x003334);
                u32 ib_put = nvkm_rd32(device, 0x003330);

                nvkm_error(subdev, "DMA_PUSHER - "
                           "ch %d [%s] get %02x%08x put %02x%08x ib_get %08x "
                           "ib_put %08x state %08x (err: %s) push %08x\n",
                           chid, name, ho_get, dma_get, ho_put, dma_put,
                           ib_get, ib_put, state, nv_dma_state_err(state),
                           push);

                /* METHOD_COUNT, in DMA_STATE on earlier chipsets */
                nvkm_wr32(device, 0x003364, 0x00000000);
                if (dma_get != dma_put || ho_get != ho_put) {
                        nvkm_wr32(device, 0x003244, dma_put);
                        nvkm_wr32(device, 0x003328, ho_put);
                } else
                if (ib_get != ib_put)
                        nvkm_wr32(device, 0x003334, ib_put);
        } else {
                nvkm_error(subdev, "DMA_PUSHER - ch %d [%s] get %08x put %08x "
                                   "state %08x (err: %s) push %08x\n",
                           chid, name, dma_get, dma_put, state,
                           nv_dma_state_err(state), push);

                if (dma_get != dma_put)
                        nvkm_wr32(device, 0x003244, dma_put);
        }
        nvkm_fifo_chan_put(&fifo->base, flags, &chan);

        nvkm_wr32(device, 0x003228, 0x00000000);
        nvkm_wr32(device, 0x003220, 0x00000001);
        nvkm_wr32(device, 0x002100, NV_PFIFO_INTR_DMA_PUSHER);
}

void
nv04_fifo_intr(struct nvkm_fifo *base)
{
        struct nv04_fifo *fifo = nv04_fifo(base);
        struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
        struct nvkm_device *device = subdev->device;
        u32 mask = nvkm_rd32(device, NV03_PFIFO_INTR_EN_0);
        u32 stat = nvkm_rd32(device, NV03_PFIFO_INTR_0) & mask;
        u32 reassign, chid, get, sem;

        reassign = nvkm_rd32(device, NV03_PFIFO_CACHES) & 1;
        nvkm_wr32(device, NV03_PFIFO_CACHES, 0);

        chid = nvkm_rd32(device, NV03_PFIFO_CACHE1_PUSH1) & (fifo->base.nr - 1);
        get  = nvkm_rd32(device, NV03_PFIFO_CACHE1_GET);

        if (stat & NV_PFIFO_INTR_CACHE_ERROR) {
                nv04_fifo_cache_error(fifo, chid, get);
                stat &= ~NV_PFIFO_INTR_CACHE_ERROR;
        }

        if (stat & NV_PFIFO_INTR_DMA_PUSHER) {
                nv04_fifo_dma_pusher(fifo, chid);
                stat &= ~NV_PFIFO_INTR_DMA_PUSHER;
        }

        if (stat & NV_PFIFO_INTR_SEMAPHORE) {
                stat &= ~NV_PFIFO_INTR_SEMAPHORE;
                nvkm_wr32(device, NV03_PFIFO_INTR_0, NV_PFIFO_INTR_SEMAPHORE);

                sem = nvkm_rd32(device, NV10_PFIFO_CACHE1_SEMAPHORE);
                nvkm_wr32(device, NV10_PFIFO_CACHE1_SEMAPHORE, sem | 0x1);

                nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, get + 4);
                nvkm_wr32(device, NV04_PFIFO_CACHE1_PULL0, 1);
        }

        if (device->card_type == NV_50) {
                if (stat & 0x00000010) {
                        stat &= ~0x00000010;
                        nvkm_wr32(device, 0x002100, 0x00000010);
                }

                if (stat & 0x40000000) {
                        nvkm_wr32(device, 0x002100, 0x40000000);
                        nvkm_fifo_uevent(&fifo->base);
                        stat &= ~0x40000000;
                }
        }

        if (stat) {
                nvkm_warn(subdev, "intr %08x\n", stat);
                nvkm_mask(device, NV03_PFIFO_INTR_EN_0, stat, 0x00000000);
                nvkm_wr32(device, NV03_PFIFO_INTR_0, stat);
        }

        nvkm_wr32(device, NV03_PFIFO_CACHES, reassign);
}

void
nv04_fifo_init(struct nvkm_fifo *base)
{
        struct nv04_fifo *fifo = nv04_fifo(base);
        struct nvkm_device *device = fifo->base.engine.subdev.device;
        struct nvkm_instmem *imem = device->imem;
        struct nvkm_ramht *ramht = imem->ramht;
        struct nvkm_memory *ramro = imem->ramro;
        struct nvkm_memory *ramfc = imem->ramfc;

        nvkm_wr32(device, NV04_PFIFO_DELAY_0, 0x000000ff);
        nvkm_wr32(device, NV04_PFIFO_DMA_TIMESLICE, 0x0101ffff);

        nvkm_wr32(device, NV03_PFIFO_RAMHT, (0x03 << 24) /* search 128 */ |
                                            ((ramht->bits - 9) << 16) |
                                            (ramht->gpuobj->addr >> 8));
        nvkm_wr32(device, NV03_PFIFO_RAMRO, nvkm_memory_addr(ramro) >> 8);
        nvkm_wr32(device, NV03_PFIFO_RAMFC, nvkm_memory_addr(ramfc) >> 8);

        nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH1, fifo->base.nr - 1);

        nvkm_wr32(device, NV03_PFIFO_INTR_0, 0xffffffff);
        nvkm_wr32(device, NV03_PFIFO_INTR_EN_0, 0xffffffff);

        nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH0, 1);
        nvkm_wr32(device, NV04_PFIFO_CACHE1_PULL0, 1);
        nvkm_wr32(device, NV03_PFIFO_CACHES, 1);
}

int
nv04_fifo_new_(const struct nvkm_fifo_func *func, struct nvkm_device *device,
               int index, int nr, const struct nv04_fifo_ramfc *ramfc,
               struct nvkm_fifo **pfifo)
{
        struct nv04_fifo *fifo;
        int ret;

        if (!(fifo = kzalloc(sizeof(*fifo), GFP_KERNEL)))
                return -ENOMEM;
        fifo->ramfc = ramfc;
        *pfifo = &fifo->base;

        ret = nvkm_fifo_ctor(func, device, index, nr, &fifo->base);
        if (ret)
                return ret;

        set_bit(nr - 1, fifo->base.mask); /* inactive channel */
        return 0;
}

static const struct nvkm_fifo_func
nv04_fifo = {
        .init = nv04_fifo_init,
        .intr = nv04_fifo_intr,
        .pause = nv04_fifo_pause,
        .start = nv04_fifo_start,
        .chan = {
                &nv04_fifo_dma_oclass,
                NULL
        },
};

int
nv04_fifo_new(struct nvkm_device *device, int index, struct nvkm_fifo **pfifo)
{
        return nv04_fifo_new_(&nv04_fifo, device, index, 16,
                              nv04_fifo_ramfc, pfifo);
}