/*
 * Copyright 2015 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 <bskeggs@redhat.com>
 */
#include "priv.h"
#include "agp.h"

#include <core/option.h>
#include <core/pci.h>
#include <subdev/mc.h>

u32
nvkm_pci_rd32(struct nvkm_pci *pci, u16 addr)
{
        return pci->func->rd32(pci, addr);
}

void
nvkm_pci_wr08(struct nvkm_pci *pci, u16 addr, u8 data)
{
        pci->func->wr08(pci, addr, data);
}

void
nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data)
{
        pci->func->wr32(pci, addr, data);
}

u32
nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32 value)
{
        u32 data = pci->func->rd32(pci, addr);
        pci->func->wr32(pci, addr, (data & ~mask) | value);
        return data;
}

void
nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
{
        u32 data = nvkm_pci_rd32(pci, 0x0050);
        if (shadow)
                data |=  0x00000001;
        else
                data &= ~0x00000001;
        nvkm_pci_wr32(pci, 0x0050, data);
}

static irqreturn_t
nvkm_pci_intr(int irq, void *arg)
{
        struct nvkm_pci *pci = arg;
        struct nvkm_device *device = pci->subdev.device;
        bool handled = false;

        if (pci->irq < 0)
                return IRQ_HANDLED;

        nvkm_mc_intr_unarm(device);
        if (pci->msi)
                pci->func->msi_rearm(pci);
        nvkm_mc_intr(device, &handled);
        nvkm_mc_intr_rearm(device);
        return handled ? IRQ_HANDLED : IRQ_NONE;
}

static int
nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
{
        struct nvkm_pci *pci = nvkm_pci(subdev);

        if (pci->agp.bridge)
                nvkm_agp_fini(pci);

        return 0;
}

static int
nvkm_pci_preinit(struct nvkm_subdev *subdev)
{
        struct nvkm_pci *pci = nvkm_pci(subdev);
        if (pci->agp.bridge)
                nvkm_agp_preinit(pci);
        return 0;
}

static int
nvkm_pci_oneinit(struct nvkm_subdev *subdev)
{
        struct nvkm_pci *pci = nvkm_pci(subdev);
        struct pci_dev *pdev = pci->pdev;
        int ret;

        if (pci_is_pcie(pci->pdev)) {
                ret = nvkm_pcie_oneinit(pci);
                if (ret)
                        return ret;
        }

        ret = request_irq(pdev->irq, nvkm_pci_intr, IRQF_SHARED, "nvkm", pci);
        if (ret)
                return ret;

        pci->irq = pdev->irq;
        return 0;
}

static int
nvkm_pci_init(struct nvkm_subdev *subdev)
{
        struct nvkm_pci *pci = nvkm_pci(subdev);
        int ret;

        if (pci->agp.bridge) {
                ret = nvkm_agp_init(pci);
                if (ret)
                        return ret;
        } else if (pci_is_pcie(pci->pdev)) {
                nvkm_pcie_init(pci);
        }

        if (pci->func->init)
                pci->func->init(pci);

        /* Ensure MSI interrupts are armed, for the case where there are
         * already interrupts pending (for whatever reason) at load time.
         */
        if (pci->msi)
                pci->func->msi_rearm(pci);

        return 0;
}

static void *
nvkm_pci_dtor(struct nvkm_subdev *subdev)
{
        struct nvkm_pci *pci = nvkm_pci(subdev);

        nvkm_agp_dtor(pci);

        if (pci->irq >= 0) {
                /* freq_irq() will call the handler, we use pci->irq == -1
                 * to signal that it's been torn down and should be a noop.
                 */
                int irq = pci->irq;
                pci->irq = -1;
                free_irq(irq, pci);
        }

        if (pci->msi)
                pci_disable_msi(pci->pdev);

        return nvkm_pci(subdev);
}

static const struct nvkm_subdev_func
nvkm_pci_func = {
        .dtor = nvkm_pci_dtor,
        .oneinit = nvkm_pci_oneinit,
        .preinit = nvkm_pci_preinit,
        .init = nvkm_pci_init,
        .fini = nvkm_pci_fini,
};

int
nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
              int index, struct nvkm_pci **ppci)
{
        struct nvkm_pci *pci;

        if (!(pci = *ppci = kzalloc(sizeof(**ppci), GFP_KERNEL)))
                return -ENOMEM;
        nvkm_subdev_ctor(&nvkm_pci_func, device, index, &pci->subdev);
        pci->func = func;
        pci->pdev = device->func->pci(device)->pdev;
        pci->irq = -1;
        pci->pcie.speed = -1;
        pci->pcie.width = -1;

        if (device->type == NVKM_DEVICE_AGP)
                nvkm_agp_ctor(pci);

        switch (pci->pdev->device & 0x0ff0) {
        case 0x00f0:
        case 0x02e0:
                /* BR02? NFI how these would be handled yet exactly */
                break;
        default:
                switch (device->chipset) {
                case 0xaa:
                        /* reported broken, nv also disable it */
                        break;
                default:
                        pci->msi = true;
                        break;
                }
        }

#ifdef __BIG_ENDIAN
        pci->msi = false;
#endif

        pci->msi = nvkm_boolopt(device->cfgopt, "NvMSI", pci->msi);
        if (pci->msi && func->msi_rearm) {
                pci->msi = pci_enable_msi(pci->pdev) == 0;
                if (pci->msi)
                        nvkm_debug(&pci->subdev, "MSI enabled\n");
        } else {
                pci->msi = false;
        }

        return 0;
}