/*
 * Copyright 2013 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 "nv50.h"

#include <subdev/bios.h>
#include <subdev/bios/dcb.h>
#include <subdev/bios/disp.h>
#include <subdev/bios/init.h>
#include <subdev/bios/pll.h>
#include <subdev/clk/pll.h>
#include <subdev/vga.h>

int
nv50_devinit_pll_set(struct nvkm_devinit *init, u32 type, u32 freq)
{
        struct nvkm_subdev *subdev = &init->subdev;
        struct nvkm_device *device = subdev->device;
        struct nvkm_bios *bios = device->bios;
        struct nvbios_pll info;
        int N1, M1, N2, M2, P;
        int ret;

        ret = nvbios_pll_parse(bios, type, &info);
        if (ret) {
                nvkm_error(subdev, "failed to retrieve pll data, %d\n", ret);
                return ret;
        }

        ret = nv04_pll_calc(subdev, &info, freq, &N1, &M1, &N2, &M2, &P);
        if (!ret) {
                nvkm_error(subdev, "failed pll calculation\n");
                return -EINVAL;
        }

        switch (info.type) {
        case PLL_VPLL0:
        case PLL_VPLL1:
                nvkm_wr32(device, info.reg + 0, 0x10000611);
                nvkm_mask(device, info.reg + 4, 0x00ff00ff, (M1 << 16) | N1);
                nvkm_mask(device, info.reg + 8, 0x7fff00ff, (P  << 28) |
                                                            (M2 << 16) | N2);
                break;
        case PLL_MEMORY:
                nvkm_mask(device, info.reg + 0, 0x01ff0000,
                                                (P << 22) |
                                                (info.bias_p << 19) |
                                                (P << 16));
                nvkm_wr32(device, info.reg + 4, (N1 << 8) | M1);
                break;
        default:
                nvkm_mask(device, info.reg + 0, 0x00070000, (P << 16));
                nvkm_wr32(device, info.reg + 4, (N1 << 8) | M1);
                break;
        }

        return 0;
}

static u64
nv50_devinit_disable(struct nvkm_devinit *init)
{
        struct nvkm_device *device = init->subdev.device;
        u32 r001540 = nvkm_rd32(device, 0x001540);
        u64 disable = 0ULL;

        if (!(r001540 & 0x40000000))
                disable |= (1ULL << NVKM_ENGINE_MPEG);

        return disable;
}

void
nv50_devinit_preinit(struct nvkm_devinit *base)
{
        struct nvkm_subdev *subdev = &base->subdev;
        struct nvkm_device *device = subdev->device;

        /* our heuristics can't detect whether the board has had its
         * devinit scripts executed or not if the display engine is
         * missing, assume it's a secondary gpu which requires post
         */
        if (!base->post) {
                u64 disable = nvkm_devinit_disable(base);
                if (disable & (1ULL << NVKM_ENGINE_DISP))
                        base->post = true;
        }

        /* magic to detect whether or not x86 vbios code has executed
         * the devinit scripts to initialise the board
         */
        if (!base->post) {
                if (!nvkm_rdvgac(device, 0, 0x00) &&
                    !nvkm_rdvgac(device, 0, 0x1a)) {
                        nvkm_debug(subdev, "adaptor not initialised\n");
                        base->post = true;
                }
        }
}

void
nv50_devinit_init(struct nvkm_devinit *base)
{
        struct nv50_devinit *init = nv50_devinit(base);
        struct nvkm_subdev *subdev = &init->base.subdev;
        struct nvkm_device *device = subdev->device;
        struct nvkm_bios *bios = device->bios;
        struct nvbios_outp info;
        struct dcb_output outp;
        u8  ver = 0xff, hdr, cnt, len;
        int i = 0;

        /* if we ran the init tables, we have to execute the first script
         * pointer of each dcb entry's display encoder table in order
         * to properly initialise each encoder.
         */
        while (init->base.post && dcb_outp_parse(bios, i, &ver, &hdr, &outp)) {
                if (nvbios_outp_match(bios, outp.hasht, outp.hashm,
                                      &ver, &hdr, &cnt, &len, &info)) {
                        nvbios_init(subdev, info.script[0],
                                init.outp = &outp;
                                init.or   = ffs(outp.or) - 1;
                                init.link = outp.sorconf.link == 2;
                        );
                }
                i++;
        }
}

int
nv50_devinit_new_(const struct nvkm_devinit_func *func,
                  struct nvkm_device *device, int index,
                  struct nvkm_devinit **pinit)
{
        struct nv50_devinit *init;

        if (!(init = kzalloc(sizeof(*init), GFP_KERNEL)))
                return -ENOMEM;
        *pinit = &init->base;

        nvkm_devinit_ctor(func, device, index, &init->base);
        return 0;
}

static const struct nvkm_devinit_func
nv50_devinit = {
        .preinit = nv50_devinit_preinit,
        .init = nv50_devinit_init,
        .post = nv04_devinit_post,
        .pll_set = nv50_devinit_pll_set,
        .disable = nv50_devinit_disable,
};

int
nv50_devinit_new(struct nvkm_device *device, int index,
                 struct nvkm_devinit **pinit)
{
        return nv50_devinit_new_(&nv50_devinit, device, index, pinit);
}