/*
 * 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/memory.h>
#include <subdev/fb.h>
#include <subdev/timer.h>

void
gf100_ltc_cbc_clear(struct nvkm_ltc *ltc, u32 start, u32 limit)
{
        struct nvkm_device *device = ltc->subdev.device;
        nvkm_wr32(device, 0x17e8cc, start);
        nvkm_wr32(device, 0x17e8d0, limit);
        nvkm_wr32(device, 0x17e8c8, 0x00000004);
}

void
gf100_ltc_cbc_wait(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        int c, s;
        for (c = 0; c < ltc->ltc_nr; c++) {
                for (s = 0; s < ltc->lts_nr; s++) {
                        const u32 addr = 0x1410c8 + (c * 0x2000) + (s * 0x400);
                        nvkm_msec(device, 2000,
                                if (!nvkm_rd32(device, addr))
                                        break;
                        );
                }
        }
}

void
gf100_ltc_zbc_clear_color(struct nvkm_ltc *ltc, int i, const u32 color[4])
{
        struct nvkm_device *device = ltc->subdev.device;
        nvkm_mask(device, 0x17ea44, 0x0000000f, i);
        nvkm_wr32(device, 0x17ea48, color[0]);
        nvkm_wr32(device, 0x17ea4c, color[1]);
        nvkm_wr32(device, 0x17ea50, color[2]);
        nvkm_wr32(device, 0x17ea54, color[3]);
}

void
gf100_ltc_zbc_clear_depth(struct nvkm_ltc *ltc, int i, const u32 depth)
{
        struct nvkm_device *device = ltc->subdev.device;
        nvkm_mask(device, 0x17ea44, 0x0000000f, i);
        nvkm_wr32(device, 0x17ea58, depth);
}

const struct nvkm_bitfield
gf100_ltc_lts_intr_name[] = {
        { 0x00000001, "IDLE_ERROR_IQ" },
        { 0x00000002, "IDLE_ERROR_CBC" },
        { 0x00000004, "IDLE_ERROR_TSTG" },
        { 0x00000008, "IDLE_ERROR_DSTG" },
        { 0x00000010, "EVICTED_CB" },
        { 0x00000020, "ILLEGAL_COMPSTAT" },
        { 0x00000040, "BLOCKLINEAR_CB" },
        { 0x00000100, "ECC_SEC_ERROR" },
        { 0x00000200, "ECC_DED_ERROR" },
        { 0x00000400, "DEBUG" },
        { 0x00000800, "ATOMIC_TO_Z" },
        { 0x00001000, "ILLEGAL_ATOMIC" },
        { 0x00002000, "BLKACTIVITY_ERR" },
        {}
};

static void
gf100_ltc_lts_intr(struct nvkm_ltc *ltc, int c, int s)
{
        struct nvkm_subdev *subdev = &ltc->subdev;
        struct nvkm_device *device = subdev->device;
        u32 base = 0x141000 + (c * 0x2000) + (s * 0x400);
        u32 intr = nvkm_rd32(device, base + 0x020);
        u32 stat = intr & 0x0000ffff;
        char msg[128];

        if (stat) {
                nvkm_snprintbf(msg, sizeof(msg), gf100_ltc_lts_intr_name, stat);
                nvkm_error(subdev, "LTC%d_LTS%d: %08x [%s]\n", c, s, stat, msg);
        }

        nvkm_wr32(device, base + 0x020, intr);
}

void
gf100_ltc_intr(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        u32 mask;

        mask = nvkm_rd32(device, 0x00017c);
        while (mask) {
                u32 s, c = __ffs(mask);
                for (s = 0; s < ltc->lts_nr; s++)
                        gf100_ltc_lts_intr(ltc, c, s);
                mask &= ~(1 << c);
        }
}

void
gf100_ltc_invalidate(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        s64 taken;

        nvkm_wr32(device, 0x70004, 0x00000001);
        taken = nvkm_wait_msec(device, 2000, 0x70004, 0x00000003, 0x00000000);

        if (taken > 0)
                nvkm_debug(&ltc->subdev, "LTC invalidate took %lld ns\n", taken);
}

void
gf100_ltc_flush(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        s64 taken;

        nvkm_wr32(device, 0x70010, 0x00000001);
        taken = nvkm_wait_msec(device, 2000, 0x70010, 0x00000003, 0x00000000);

        if (taken > 0)
                nvkm_debug(&ltc->subdev, "LTC flush took %lld ns\n", taken);
}

/* TODO: Figure out tag memory details and drop the over-cautious allocation.
 */
int
gf100_ltc_oneinit_tag_ram(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        struct nvkm_fb *fb = device->fb;
        struct nvkm_ram *ram = fb->ram;
        u32 bits = (nvkm_rd32(device, 0x100c80) & 0x00001000) ? 16 : 17;
        u32 tag_size, tag_margin, tag_align;
        int ret;

        /* No VRAM, no tags for now. */
        if (!ram) {
                ltc->num_tags = 0;
                goto mm_init;
        }

        /* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
        ltc->num_tags = (ram->size >> 17) / 4;
        if (ltc->num_tags > (1 << bits))
                ltc->num_tags = 1 << bits; /* we have 16/17 bits in PTE */
        ltc->num_tags = (ltc->num_tags + 63) & ~63; /* round up to 64 */

        tag_align = ltc->ltc_nr * 0x800;
        tag_margin = (tag_align < 0x6000) ? 0x6000 : tag_align;

        /* 4 part 4 sub: 0x2000 bytes for 56 tags */
        /* 3 part 4 sub: 0x6000 bytes for 168 tags */
        /*
         * About 147 bytes per tag. Let's be safe and allocate x2, which makes
         * 0x4980 bytes for 64 tags, and round up to 0x6000 bytes for 64 tags.
         *
         * For 4 GiB of memory we'll have 8192 tags which makes 3 MiB, < 0.1 %.
         */
        tag_size  = (ltc->num_tags / 64) * 0x6000 + tag_margin;
        tag_size += tag_align;

        ret = nvkm_ram_get(device, NVKM_RAM_MM_NORMAL, 0x01, 12, tag_size,
                           true, true, &ltc->tag_ram);
        if (ret) {
                ltc->num_tags = 0;
        } else {
                u64 tag_base = nvkm_memory_addr(ltc->tag_ram) + tag_margin;

                tag_base += tag_align - 1;
                do_div(tag_base, tag_align);

                ltc->tag_base = tag_base;
        }

mm_init:
        nvkm_mm_fini(&fb->tags.mm);
        return nvkm_mm_init(&fb->tags.mm, 0, 0, ltc->num_tags, 1);
}

int
gf100_ltc_oneinit(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        const u32 parts = nvkm_rd32(device, 0x022438);
        const u32  mask = nvkm_rd32(device, 0x022554);
        const u32 slice = nvkm_rd32(device, 0x17e8dc) >> 28;
        int i;

        for (i = 0; i < parts; i++) {
                if (!(mask & (1 << i)))
                        ltc->ltc_nr++;
        }
        ltc->lts_nr = slice;

        return gf100_ltc_oneinit_tag_ram(ltc);
}

static void
gf100_ltc_init(struct nvkm_ltc *ltc)
{
        struct nvkm_device *device = ltc->subdev.device;
        u32 lpg128 = !(nvkm_rd32(device, 0x100c80) & 0x00000001);

        nvkm_mask(device, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
        nvkm_wr32(device, 0x17e8d8, ltc->ltc_nr);
        nvkm_wr32(device, 0x17e8d4, ltc->tag_base);
        nvkm_mask(device, 0x17e8c0, 0x00000002, lpg128 ? 0x00000002 : 0x00000000);
}

static const struct nvkm_ltc_func
gf100_ltc = {
        .oneinit = gf100_ltc_oneinit,
        .init = gf100_ltc_init,
        .intr = gf100_ltc_intr,
        .cbc_clear = gf100_ltc_cbc_clear,
        .cbc_wait = gf100_ltc_cbc_wait,
        .zbc_color = 16,
        .zbc_depth = 16,
        .zbc_clear_color = gf100_ltc_zbc_clear_color,
        .zbc_clear_depth = gf100_ltc_zbc_clear_depth,
        .invalidate = gf100_ltc_invalidate,
        .flush = gf100_ltc_flush,
};

int
gf100_ltc_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
              struct nvkm_ltc **pltc)
{
        return nvkm_ltc_new_(&gf100_ltc, device, type, inst, pltc);
}