drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c

   1 /*
   2  * Copyright 2015 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs <bskeggs@redhat.com>
  23  */
  24 #include <core/tegra.h>
  25 #ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER
  26 #include "priv.h"
  27
  28 static struct nvkm_device_tegra *
  29 nvkm_device_tegra(struct nvkm_device *device)
  30 {
  31         return container_of(device, struct nvkm_device_tegra, device);
  32 }
  33
  34 static struct resource *
  35 nvkm_device_tegra_resource(struct nvkm_device *device, unsigned bar)
  36 {
  37         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
  38         return platform_get_resource(tdev->pdev, IORESOURCE_MEM, bar);
  39 }
  40
  41 static resource_size_t
  42 nvkm_device_tegra_resource_addr(struct nvkm_device *device, unsigned bar)
  43 {
  44         struct resource *res = nvkm_device_tegra_resource(device, bar);
  45         return res ? res->start : 0;
  46 }
  47
  48 static resource_size_t
  49 nvkm_device_tegra_resource_size(struct nvkm_device *device, unsigned bar)
  50 {
  51         struct resource *res = nvkm_device_tegra_resource(device, bar);
  52         return res ? resource_size(res) : 0;
  53 }
  54
  55 static irqreturn_t
  56 nvkm_device_tegra_intr(int irq, void *arg)
  57 {
  58         struct nvkm_device_tegra *tdev = arg;
  59         struct nvkm_mc *mc = tdev->device.mc;
  60         bool handled = false;
  61         if (likely(mc)) {
  62                 nvkm_mc_intr_unarm(mc);
  63                 nvkm_mc_intr(mc, &handled);
  64                 nvkm_mc_intr_rearm(mc);
  65         }
  66         return handled ? IRQ_HANDLED : IRQ_NONE;
  67 }
  68
  69 static void
  70 nvkm_device_tegra_fini(struct nvkm_device *device, bool suspend)
  71 {
  72         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
  73         if (tdev->irq) {
  74                 free_irq(tdev->irq, tdev);
  75                 tdev->irq = 0;
  76         };
  77 }
  78
  79 static int
  80 nvkm_device_tegra_init(struct nvkm_device *device)
  81 {
  82         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
  83         int irq, ret;
  84
  85         irq = platform_get_irq_byname(tdev->pdev, "stall");
  86         if (irq < 0)
  87                 return irq;
  88
  89         ret = request_irq(irq, nvkm_device_tegra_intr,
  90                           IRQF_SHARED, "nvkm", tdev);
  91         if (ret)
  92                 return ret;
  93
  94         tdev->irq = irq;
  95         return 0;
  96 }
  97
  98 static const struct nvkm_device_func
  99 nvkm_device_tegra_func = {
 100         .tegra = nvkm_device_tegra,
 101         .init = nvkm_device_tegra_init,
 102         .fini = nvkm_device_tegra_fini,
 103         .resource_addr = nvkm_device_tegra_resource_addr,
 104         .resource_size = nvkm_device_tegra_resource_size,
 105         .cpu_coherent = false,
 106 };
 107
 108 int
 109 nvkm_device_tegra_new(struct platform_device *pdev,
 110                       const char *cfg, const char *dbg,
 111                       bool detect, bool mmio, u64 subdev_mask,
 112                       struct nvkm_device **pdevice)
 113 {
 114         struct nvkm_device_tegra *tdev;
 115
 116         if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
 117                 return -ENOMEM;
 118         *pdevice = &tdev->device;
 119         tdev->pdev = pdev;
 120         tdev->irq = -1;
 121
 122         return nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev,
 123                                 NVKM_DEVICE_TEGRA, pdev->id, NULL,
 124                                 cfg, dbg, detect, mmio, subdev_mask,
 125                                 &tdev->device);
 126 }
 127 #else
 128 int
 129 nvkm_device_tegra_new(struct platform_device *pdev,
 130                       const char *cfg, const char *dbg,
 131                       bool detect, bool mmio, u64 subdev_mask,
 132                       struct nvkm_device **pdevice)
 133 {
 134         return -ENOSYS;
 135 }
 136 #endif