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

   1 /*
   2  * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
   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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22 #include <core/tegra.h>
  23 #ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER
  24 #include "priv.h"
  25
  26 static int
  27 nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev)
  28 {
  29         int ret;
  30
  31         ret = regulator_enable(tdev->vdd);
  32         if (ret)
  33                 goto err_power;
  34
  35         ret = clk_prepare_enable(tdev->clk);
  36         if (ret)
  37                 goto err_clk;
  38         ret = clk_prepare_enable(tdev->clk_pwr);
  39         if (ret)
  40                 goto err_clk_pwr;
  41         clk_set_rate(tdev->clk_pwr, 204000000);
  42         udelay(10);
  43
  44         reset_control_assert(tdev->rst);
  45         udelay(10);
  46
  47         ret = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
  48         if (ret)
  49                 goto err_clamp;
  50         udelay(10);
  51
  52         reset_control_deassert(tdev->rst);
  53         udelay(10);
  54
  55         return 0;
  56
  57 err_clamp:
  58         clk_disable_unprepare(tdev->clk_pwr);
  59 err_clk_pwr:
  60         clk_disable_unprepare(tdev->clk);
  61 err_clk:
  62         regulator_disable(tdev->vdd);
  63 err_power:
  64         return ret;
  65 }
  66
  67 static int
  68 nvkm_device_tegra_power_down(struct nvkm_device_tegra *tdev)
  69 {
  70         reset_control_assert(tdev->rst);
  71         udelay(10);
  72
  73         clk_disable_unprepare(tdev->clk_pwr);
  74         clk_disable_unprepare(tdev->clk);
  75         udelay(10);
  76
  77         return regulator_disable(tdev->vdd);
  78 }
  79
  80 static void
  81 nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
  82 {
  83 #if IS_ENABLED(CONFIG_IOMMU_API)
  84         struct device *dev = &tdev->pdev->dev;
  85         unsigned long pgsize_bitmap;
  86         int ret;
  87
  88         if (!tdev->func->iommu_bit)
  89                 return;
  90
  91         mutex_init(&tdev->iommu.mutex);
  92
  93         if (iommu_present(&platform_bus_type)) {
  94                 tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
  95                 if (IS_ERR(tdev->iommu.domain))
  96                         goto error;
  97
  98                 /*
  99                  * A IOMMU is only usable if it supports page sizes smaller
 100                  * or equal to the system's PAGE_SIZE, with a preference if
 101                  * both are equal.
 102                  */
 103                 pgsize_bitmap = tdev->iommu.domain->ops->pgsize_bitmap;
 104                 if (pgsize_bitmap & PAGE_SIZE) {
 105                         tdev->iommu.pgshift = PAGE_SHIFT;
 106                 } else {
 107                         tdev->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
 108                         if (tdev->iommu.pgshift == 0) {
 109                                 dev_warn(dev, "unsupported IOMMU page size\n");
 110                                 goto free_domain;
 111                         }
 112                         tdev->iommu.pgshift -= 1;
 113                 }
 114
 115                 ret = iommu_attach_device(tdev->iommu.domain, dev);
 116                 if (ret)
 117                         goto free_domain;
 118
 119                 ret = nvkm_mm_init(&tdev->iommu.mm, 0,
 120                                    (1ULL << tdev->func->iommu_bit) >>
 121                                    tdev->iommu.pgshift, 1);
 122                 if (ret)
 123                         goto detach_device;
 124         }
 125
 126         return;
 127
 128 detach_device:
 129         iommu_detach_device(tdev->iommu.domain, dev);
 130
 131 free_domain:
 132         iommu_domain_free(tdev->iommu.domain);
 133
 134 error:
 135         tdev->iommu.domain = NULL;
 136         tdev->iommu.pgshift = 0;
 137         dev_err(dev, "cannot initialize IOMMU MM\n");
 138 #endif
 139 }
 140
 141 static void
 142 nvkm_device_tegra_remove_iommu(struct nvkm_device_tegra *tdev)
 143 {
 144 #if IS_ENABLED(CONFIG_IOMMU_API)
 145         if (tdev->iommu.domain) {
 146                 nvkm_mm_fini(&tdev->iommu.mm);
 147                 iommu_detach_device(tdev->iommu.domain, tdev->device.dev);
 148                 iommu_domain_free(tdev->iommu.domain);
 149         }
 150 #endif
 151 }
 152
 153 static struct nvkm_device_tegra *
 154 nvkm_device_tegra(struct nvkm_device *device)
 155 {
 156         return container_of(device, struct nvkm_device_tegra, device);
 157 }
 158
 159 static struct resource *
 160 nvkm_device_tegra_resource(struct nvkm_device *device, unsigned bar)
 161 {
 162         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 163         return platform_get_resource(tdev->pdev, IORESOURCE_MEM, bar);
 164 }
 165
 166 static resource_size_t
 167 nvkm_device_tegra_resource_addr(struct nvkm_device *device, unsigned bar)
 168 {
 169         struct resource *res = nvkm_device_tegra_resource(device, bar);
 170         return res ? res->start : 0;
 171 }
 172
 173 static resource_size_t
 174 nvkm_device_tegra_resource_size(struct nvkm_device *device, unsigned bar)
 175 {
 176         struct resource *res = nvkm_device_tegra_resource(device, bar);
 177         return res ? resource_size(res) : 0;
 178 }
 179
 180 static irqreturn_t
 181 nvkm_device_tegra_intr(int irq, void *arg)
 182 {
 183         struct nvkm_device_tegra *tdev = arg;
 184         struct nvkm_mc *mc = tdev->device.mc;
 185         bool handled = false;
 186         if (likely(mc)) {
 187                 nvkm_mc_intr_unarm(mc);
 188                 nvkm_mc_intr(mc, &handled);
 189                 nvkm_mc_intr_rearm(mc);
 190         }
 191         return handled ? IRQ_HANDLED : IRQ_NONE;
 192 }
 193
 194 static void
 195 nvkm_device_tegra_fini(struct nvkm_device *device, bool suspend)
 196 {
 197         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 198         if (tdev->irq) {
 199                 free_irq(tdev->irq, tdev);
 200                 tdev->irq = 0;
 201         };
 202 }
 203
 204 static int
 205 nvkm_device_tegra_init(struct nvkm_device *device)
 206 {
 207         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 208         int irq, ret;
 209
 210         irq = platform_get_irq_byname(tdev->pdev, "stall");
 211         if (irq < 0)
 212                 return irq;
 213
 214         ret = request_irq(irq, nvkm_device_tegra_intr,
 215                           IRQF_SHARED, "nvkm", tdev);
 216         if (ret)
 217                 return ret;
 218
 219         tdev->irq = irq;
 220         return 0;
 221 }
 222
 223 static void *
 224 nvkm_device_tegra_dtor(struct nvkm_device *device)
 225 {
 226         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 227         nvkm_device_tegra_power_down(tdev);
 228         nvkm_device_tegra_remove_iommu(tdev);
 229         return tdev;
 230 }
 231
 232 static const struct nvkm_device_func
 233 nvkm_device_tegra_func = {
 234         .tegra = nvkm_device_tegra,
 235         .dtor = nvkm_device_tegra_dtor,
 236         .init = nvkm_device_tegra_init,
 237         .fini = nvkm_device_tegra_fini,
 238         .resource_addr = nvkm_device_tegra_resource_addr,
 239         .resource_size = nvkm_device_tegra_resource_size,
 240         .cpu_coherent = false,
 241 };
 242
 243 int
 244 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
 245                       struct platform_device *pdev,
 246                       const char *cfg, const char *dbg,
 247                       bool detect, bool mmio, u64 subdev_mask,
 248                       struct nvkm_device **pdevice)
 249 {
 250         struct nvkm_device_tegra *tdev;
 251         int ret;
 252
 253         if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
 254                 return -ENOMEM;
 255
 256         tdev->func = func;
 257         tdev->pdev = pdev;
 258         tdev->irq = -1;
 259
 260         tdev->vdd = devm_regulator_get(&pdev->dev, "vdd");
 261         if (IS_ERR(tdev->vdd)) {
 262                 ret = PTR_ERR(tdev->vdd);
 263                 goto free;
 264         }
 265
 266         tdev->rst = devm_reset_control_get(&pdev->dev, "gpu");
 267         if (IS_ERR(tdev->rst)) {
 268                 ret = PTR_ERR(tdev->rst);
 269                 goto free;
 270         }
 271
 272         tdev->clk = devm_clk_get(&pdev->dev, "gpu");
 273         if (IS_ERR(tdev->clk)) {
 274                 ret = PTR_ERR(tdev->clk);
 275                 goto free;
 276         }
 277
 278         tdev->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
 279         if (IS_ERR(tdev->clk_pwr)) {
 280                 ret = PTR_ERR(tdev->clk_pwr);
 281                 goto free;
 282         }
 283
 284         nvkm_device_tegra_probe_iommu(tdev);
 285
 286         ret = nvkm_device_tegra_power_up(tdev);
 287         if (ret)
 288                 goto remove;
 289
 290         tdev->gpu_speedo = tegra_sku_info.gpu_speedo_value;
 291         ret = nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev,
 292                                NVKM_DEVICE_TEGRA, pdev->id, NULL,
 293                                cfg, dbg, detect, mmio, subdev_mask,
 294                                &tdev->device);
 295         if (ret)
 296                 goto powerdown;
 297
 298         *pdevice = &tdev->device;
 299
 300         return 0;
 301
 302 powerdown:
 303         nvkm_device_tegra_power_down(tdev);
 304 remove:
 305         nvkm_device_tegra_remove_iommu(tdev);
 306 free:
 307         kfree(tdev);
 308         return ret;
 309 }
 310 #else
 311 int
 312 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
 313                       struct platform_device *pdev,
 314                       const char *cfg, const char *dbg,
 315                       bool detect, bool mmio, u64 subdev_mask,
 316                       struct nvkm_device **pdevice)
 317 {
 318         return -ENOSYS;
 319 }
 320 #endif