// SPDX-License-Identifier: MIT
#ifndef __NVKM_PMU_MEMX_H__
#define __NVKM_PMU_MEMX_H__
#include "priv.h"

struct nvkm_memx {
        struct nvkm_pmu *pmu;
        u32 base;
        u32 size;
        struct {
                u32 mthd;
                u32 size;
                u32 data[64];
        } c;
};

static void
memx_out(struct nvkm_memx *memx)
{
        struct nvkm_device *device = memx->pmu->subdev.device;
        int i;

        if (memx->c.mthd) {
                nvkm_wr32(device, 0x10a1c4, (memx->c.size << 16) | memx->c.mthd);
                for (i = 0; i < memx->c.size; i++)
                        nvkm_wr32(device, 0x10a1c4, memx->c.data[i]);
                memx->c.mthd = 0;
                memx->c.size = 0;
        }
}

static void
memx_cmd(struct nvkm_memx *memx, u32 mthd, u32 size, u32 data[])
{
        if ((memx->c.size + size >= ARRAY_SIZE(memx->c.data)) ||
            (memx->c.mthd && memx->c.mthd != mthd))
                memx_out(memx);
        memcpy(&memx->c.data[memx->c.size], data, size * sizeof(data[0]));
        memx->c.size += size;
        memx->c.mthd  = mthd;
}

int
nvkm_memx_init(struct nvkm_pmu *pmu, struct nvkm_memx **pmemx)
{
        struct nvkm_device *device = pmu->subdev.device;
        struct nvkm_memx *memx;
        u32 reply[2];
        int ret;

        ret = nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_INFO,
                            MEMX_INFO_DATA, 0);
        if (ret)
                return ret;

        memx = *pmemx = kzalloc(sizeof(*memx), GFP_KERNEL);
        if (!memx)
                return -ENOMEM;
        memx->pmu = pmu;
        memx->base = reply[0];
        memx->size = reply[1];

        /* acquire data segment access */
        do {
                nvkm_wr32(device, 0x10a580, 0x00000003);
        } while (nvkm_rd32(device, 0x10a580) != 0x00000003);
        nvkm_wr32(device, 0x10a1c0, 0x01000000 | memx->base);
        return 0;
}

int
nvkm_memx_fini(struct nvkm_memx **pmemx, bool exec)
{
        struct nvkm_memx *memx = *pmemx;
        struct nvkm_pmu *pmu = memx->pmu;
        struct nvkm_subdev *subdev = &pmu->subdev;
        struct nvkm_device *device = subdev->device;
        u32 finish, reply[2];

        /* flush the cache... */
        memx_out(memx);

        /* release data segment access */
        finish = nvkm_rd32(device, 0x10a1c0) & 0x00ffffff;
        nvkm_wr32(device, 0x10a580, 0x00000000);

        /* call MEMX process to execute the script, and wait for reply */
        if (exec) {
                nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_EXEC,
                              memx->base, finish);
                nvkm_debug(subdev, "Exec took %uns, PMU_IN %08x\n",
                           reply[0], reply[1]);
        }

        kfree(memx);
        return 0;
}

void
nvkm_memx_wr32(struct nvkm_memx *memx, u32 addr, u32 data)
{
        nvkm_debug(&memx->pmu->subdev, "R[%06x] = %08x\n", addr, data);
        memx_cmd(memx, MEMX_WR32, 2, (u32[]){ addr, data });
}

void
nvkm_memx_wait(struct nvkm_memx *memx,
                  u32 addr, u32 mask, u32 data, u32 nsec)
{
        nvkm_debug(&memx->pmu->subdev, "R[%06x] & %08x == %08x, %d us\n",
                   addr, mask, data, nsec);
        memx_cmd(memx, MEMX_WAIT, 4, (u32[]){ addr, mask, data, nsec });
        memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_nsec(struct nvkm_memx *memx, u32 nsec)
{
        nvkm_debug(&memx->pmu->subdev, "    DELAY = %d ns\n", nsec);
        memx_cmd(memx, MEMX_DELAY, 1, (u32[]){ nsec });
        memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_wait_vblank(struct nvkm_memx *memx)
{
        struct nvkm_subdev *subdev = &memx->pmu->subdev;
        struct nvkm_device *device = subdev->device;
        u32 heads, x, y, px = 0;
        int i, head_sync;

        if (device->chipset < 0xd0) {
                heads = nvkm_rd32(device, 0x610050);
                for (i = 0; i < 2; i++) {
                        /* Heuristic: sync to head with biggest resolution */
                        if (heads & (2 << (i << 3))) {
                                x = nvkm_rd32(device, 0x610b40 + (0x540 * i));
                                y = (x & 0xffff0000) >> 16;
                                x &= 0x0000ffff;
                                if ((x * y) > px) {
                                        px = (x * y);
                                        head_sync = i;
                                }
                        }
                }
        }

        if (px == 0) {
                nvkm_debug(subdev, "WAIT VBLANK !NO ACTIVE HEAD\n");
                return;
        }

        nvkm_debug(subdev, "WAIT VBLANK HEAD%d\n", head_sync);
        memx_cmd(memx, MEMX_VBLANK, 1, (u32[]){ head_sync });
        memx_out(memx); /* fuc can't handle multiple */
}

void
nvkm_memx_train(struct nvkm_memx *memx)
{
        nvkm_debug(&memx->pmu->subdev, "   MEM TRAIN\n");
        memx_cmd(memx, MEMX_TRAIN, 0, NULL);
}

int
nvkm_memx_train_result(struct nvkm_pmu *pmu, u32 *res, int rsize)
{
        struct nvkm_device *device = pmu->subdev.device;
        u32 reply[2], base, size, i;
        int ret;

        ret = nvkm_pmu_send(pmu, reply, PROC_MEMX, MEMX_MSG_INFO,
                            MEMX_INFO_TRAIN, 0);
        if (ret)
                return ret;

        base = reply[0];
        size = reply[1] >> 2;
        if (size > rsize)
                return -ENOMEM;

        /* read the packet */
        nvkm_wr32(device, 0x10a1c0, 0x02000000 | base);

        for (i = 0; i < size; i++)
                res[i] = nvkm_rd32(device, 0x10a1c4);

        return 0;
}

void
nvkm_memx_block(struct nvkm_memx *memx)
{
        nvkm_debug(&memx->pmu->subdev, "   HOST BLOCKED\n");
        memx_cmd(memx, MEMX_ENTER, 0, NULL);
}

void
nvkm_memx_unblock(struct nvkm_memx *memx)
{
        nvkm_debug(&memx->pmu->subdev, "   HOST UNBLOCKED\n");
        memx_cmd(memx, MEMX_LEAVE, 0, NULL);
}
#endif