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         if (tdev->clk_ref) {
  39                 ret = clk_prepare_enable(tdev->clk_ref);
  40                 if (ret)
  41                         goto err_clk_ref;
  42         }
  43         ret = clk_prepare_enable(tdev->clk_pwr);
  44         if (ret)
  45                 goto err_clk_pwr;
  46         clk_set_rate(tdev->clk_pwr, 204000000);
  47         udelay(10);
  48
  49         reset_control_assert(tdev->rst);
  50         udelay(10);
  51
  52         ret = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
  53         if (ret)
  54                 goto err_clamp;
  55         udelay(10);
  56
  57         reset_control_deassert(tdev->rst);
  58         udelay(10);
  59
  60         return 0;
  61
  62 err_clamp:
  63         clk_disable_unprepare(tdev->clk_pwr);
  64 err_clk_pwr:
  65         if (tdev->clk_ref)
  66                 clk_disable_unprepare(tdev->clk_ref);
  67 err_clk_ref:
  68         clk_disable_unprepare(tdev->clk);
  69 err_clk:
  70         regulator_disable(tdev->vdd);
  71 err_power:
  72         return ret;
  73 }
  74
  75 static int
  76 nvkm_device_tegra_power_down(struct nvkm_device_tegra *tdev)
  77 {
  78         reset_control_assert(tdev->rst);
  79         udelay(10);
  80
  81         clk_disable_unprepare(tdev->clk_pwr);
  82         if (tdev->clk_ref)
  83                 clk_disable_unprepare(tdev->clk_ref);
  84         clk_disable_unprepare(tdev->clk);
  85         udelay(10);
  86
  87         return regulator_disable(tdev->vdd);
  88 }
  89
  90 static void
  91 nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
  92 {
  93 #if IS_ENABLED(CONFIG_IOMMU_API)
  94         struct device *dev = &tdev->pdev->dev;
  95         unsigned long pgsize_bitmap;
  96         int ret;
  97
  98         if (!tdev->func->iommu_bit)
  99                 return;
 100
 101         mutex_init(&tdev->iommu.mutex);
 102
 103         if (iommu_present(&platform_bus_type)) {
 104                 tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
 105                 if (IS_ERR(tdev->iommu.domain))
 106                         goto error;
 107
 108                 /*
 109                  * A IOMMU is only usable if it supports page sizes smaller
 110                  * or equal to the system's PAGE_SIZE, with a preference if
 111                  * both are equal.
 112                  */
 113                 pgsize_bitmap = tdev->iommu.domain->ops->pgsize_bitmap;
 114                 if (pgsize_bitmap & PAGE_SIZE) {
 115                         tdev->iommu.pgshift = PAGE_SHIFT;
 116                 } else {
 117                         tdev->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
 118                         if (tdev->iommu.pgshift == 0) {
 119                                 dev_warn(dev, "unsupported IOMMU page size\n");
 120                                 goto free_domain;
 121                         }
 122                         tdev->iommu.pgshift -= 1;
 123                 }
 124
 125                 ret = iommu_attach_device(tdev->iommu.domain, dev);
 126                 if (ret)
 127                         goto free_domain;
 128
 129                 ret = nvkm_mm_init(&tdev->iommu.mm, 0,
 130                                    (1ULL << tdev->func->iommu_bit) >>
 131                                    tdev->iommu.pgshift, 1);
 132                 if (ret)
 133                         goto detach_device;
 134         }
 135
 136         return;
 137
 138 detach_device:
 139         iommu_detach_device(tdev->iommu.domain, dev);
 140
 141 free_domain:
 142         iommu_domain_free(tdev->iommu.domain);
 143
 144 error:
 145         tdev->iommu.domain = NULL;
 146         tdev->iommu.pgshift = 0;
 147         dev_err(dev, "cannot initialize IOMMU MM\n");
 148 #endif
 149 }
 150
 151 static void
 152 nvkm_device_tegra_remove_iommu(struct nvkm_device_tegra *tdev)
 153 {
 154 #if IS_ENABLED(CONFIG_IOMMU_API)
 155         if (tdev->iommu.domain) {
 156                 nvkm_mm_fini(&tdev->iommu.mm);
 157                 iommu_detach_device(tdev->iommu.domain, tdev->device.dev);
 158                 iommu_domain_free(tdev->iommu.domain);
 159         }
 160 #endif
 161 }
 162
 163 static struct nvkm_device_tegra *
 164 nvkm_device_tegra(struct nvkm_device *device)
 165 {
 166         return container_of(device, struct nvkm_device_tegra, device);
 167 }
 168
 169 static struct resource *
 170 nvkm_device_tegra_resource(struct nvkm_device *device, unsigned bar)
 171 {
 172         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 173         return platform_get_resource(tdev->pdev, IORESOURCE_MEM, bar);
 174 }
 175
 176 static resource_size_t
 177 nvkm_device_tegra_resource_addr(struct nvkm_device *device, unsigned bar)
 178 {
 179         struct resource *res = nvkm_device_tegra_resource(device, bar);
 180         return res ? res->start : 0;
 181 }
 182
 183 static resource_size_t
 184 nvkm_device_tegra_resource_size(struct nvkm_device *device, unsigned bar)
 185 {
 186         struct resource *res = nvkm_device_tegra_resource(device, bar);
 187         return res ? resource_size(res) : 0;
 188 }
 189
 190 static irqreturn_t
 191 nvkm_device_tegra_intr(int irq, void *arg)
 192 {
 193         struct nvkm_device_tegra *tdev = arg;
 194         struct nvkm_device *device = &tdev->device;
 195         bool handled = false;
 196         nvkm_mc_intr_unarm(device);
 197         nvkm_mc_intr(device, &handled);
 198         nvkm_mc_intr_rearm(device);
 199         return handled ? IRQ_HANDLED : IRQ_NONE;
 200 }
 201
 202 static void
 203 nvkm_device_tegra_fini(struct nvkm_device *device, bool suspend)
 204 {
 205         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 206         if (tdev->irq) {
 207                 free_irq(tdev->irq, tdev);
 208                 tdev->irq = 0;
 209         };
 210 }
 211
 212 static int
 213 nvkm_device_tegra_init(struct nvkm_device *device)
 214 {
 215         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 216         int irq, ret;
 217
 218         irq = platform_get_irq_byname(tdev->pdev, "stall");
 219         if (irq < 0)
 220                 return irq;
 221
 222         ret = request_irq(irq, nvkm_device_tegra_intr,
 223                           IRQF_SHARED, "nvkm", tdev);
 224         if (ret)
 225                 return ret;
 226
 227         tdev->irq = irq;
 228         return 0;
 229 }
 230
 231 static void *
 232 nvkm_device_tegra_dtor(struct nvkm_device *device)
 233 {
 234         struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
 235         nvkm_device_tegra_power_down(tdev);
 236         nvkm_device_tegra_remove_iommu(tdev);
 237         return tdev;
 238 }
 239
 240 static const struct nvkm_device_func
 241 nvkm_device_tegra_func = {
 242         .tegra = nvkm_device_tegra,
 243         .dtor = nvkm_device_tegra_dtor,
 244         .init = nvkm_device_tegra_init,
 245         .fini = nvkm_device_tegra_fini,
 246         .resource_addr = nvkm_device_tegra_resource_addr,
 247         .resource_size = nvkm_device_tegra_resource_size,
 248         .cpu_coherent = false,
 249 };
 250
 251 int
 252 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
 253                       struct platform_device *pdev,
 254                       const char *cfg, const char *dbg,
 255                       bool detect, bool mmio, u64 subdev_mask,
 256                       struct nvkm_device **pdevice)
 257 {
 258         struct nvkm_device_tegra *tdev;
 259         int ret;
 260
 261         if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
 262                 return -ENOMEM;
 263
 264         tdev->func = func;
 265         tdev->pdev = pdev;
 266
 267         tdev->vdd = devm_regulator_get(&pdev->dev, "vdd");
 268         if (IS_ERR(tdev->vdd)) {
 269                 ret = PTR_ERR(tdev->vdd);
 270                 goto free;
 271         }
 272
 273         tdev->rst = devm_reset_control_get(&pdev->dev, "gpu");
 274         if (IS_ERR(tdev->rst)) {
 275                 ret = PTR_ERR(tdev->rst);
 276                 goto free;
 277         }
 278
 279         tdev->clk = devm_clk_get(&pdev->dev, "gpu");
 280         if (IS_ERR(tdev->clk)) {
 281                 ret = PTR_ERR(tdev->clk);
 282                 goto free;
 283         }
 284
 285         if (func->require_ref_clk)
 286                 tdev->clk_ref = devm_clk_get(&pdev->dev, "ref");
 287         if (IS_ERR(tdev->clk_ref)) {
 288                 ret = PTR_ERR(tdev->clk_ref);
 289                 goto free;
 290         }
 291
 292         tdev->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
 293         if (IS_ERR(tdev->clk_pwr)) {
 294                 ret = PTR_ERR(tdev->clk_pwr);
 295                 goto free;
 296         }
 297
 298         /**
 299          * The IOMMU bit defines the upper limit of the GPU-addressable space.
 300          * This will be refined in nouveau_ttm_init but we need to do it early
 301          * for instmem to behave properly
 302          */
 303         ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(tdev->func->iommu_bit));
 304         if (ret)
 305                 goto free;
 306
 307         nvkm_device_tegra_probe_iommu(tdev);
 308
 309         ret = nvkm_device_tegra_power_up(tdev);
 310         if (ret)
 311                 goto remove;
 312
 313         tdev->gpu_speedo = tegra_sku_info.gpu_speedo_value;
 314         tdev->gpu_speedo_id = tegra_sku_info.gpu_speedo_id;
 315         ret = nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev,
 316                                NVKM_DEVICE_TEGRA, pdev->id, NULL,
 317                                cfg, dbg, detect, mmio, subdev_mask,
 318                                &tdev->device);
 319         if (ret)
 320                 goto powerdown;
 321
 322         *pdevice = &tdev->device;
 323
 324         return 0;
 325
 326 powerdown:
 327         nvkm_device_tegra_power_down(tdev);
 328 remove:
 329         nvkm_device_tegra_remove_iommu(tdev);
 330 free:
 331         kfree(tdev);
 332         return ret;
 333 }
 334 #else
 335 int
 336 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
 337                       struct platform_device *pdev,
 338                       const char *cfg, const char *dbg,
 339                       bool detect, bool mmio, u64 subdev_mask,
 340                       struct nvkm_device **pdevice)
 341 {
 342         return -ENOSYS;
 343 }
 344 #endif