text: /*
   * 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);
  }
  
  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_mc *mc = pci->subdev.device->mc;
  	bool handled = false;
  	if (likely(mc)) {
  		nvkm_mc_intr_unarm(mc);
  		if (pci->msi)
  			pci->func->msi_rearm(pci);
  		nvkm_mc_intr(mc, &handled);
  		nvkm_mc_intr_rearm(mc);
  	}
  	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->irq >= 0) {
  		free_irq(pci->irq, pci);
  		pci->irq = -1;
  	};
  
  	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_init(struct nvkm_subdev *subdev)
  {
  	struct nvkm_pci *pci = nvkm_pci(subdev);
  	struct pci_dev *pdev = pci->pdev;
  	int ret;
  
  	if (pci->agp.bridge) {
  		ret = nvkm_agp_init(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 ret;
  }
  
  static void *
  nvkm_pci_dtor(struct nvkm_subdev *subdev)
  {
  	struct nvkm_pci *pci = nvkm_pci(subdev);
  	nvkm_agp_dtor(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,
  	.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, 0, &pci->subdev);
  	pci->func = func;
  	pci->pdev = device->func->pci(device)->pdev;
  	pci->irq = -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;
  		}
  	}
  
  	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;
  }
  