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 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) 27 #include <asm/dma-iommu.h> 28 #endif 29 30 static int 31 nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev) 32 { 33 int ret; 34 35 if (tdev->vdd) { 36 ret = regulator_enable(tdev->vdd); 37 if (ret) 38 goto err_power; 39 } 40 41 ret = clk_prepare_enable(tdev->clk); 42 if (ret) 43 goto err_clk; 44 ret = clk_prepare_enable(tdev->clk_ref); 45 if (ret) 46 goto err_clk_ref; 47 ret = clk_prepare_enable(tdev->clk_pwr); 48 if (ret) 49 goto err_clk_pwr; 50 clk_set_rate(tdev->clk_pwr, 204000000); 51 udelay(10); 52 53 if (!tdev->pdev->dev.pm_domain) { 54 reset_control_assert(tdev->rst); 55 udelay(10); 56 57 ret = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D); 58 if (ret) 59 goto err_clamp; 60 udelay(10); 61 62 reset_control_deassert(tdev->rst); 63 udelay(10); 64 } 65 66 return 0; 67 68 err_clamp: 69 clk_disable_unprepare(tdev->clk_pwr); 70 err_clk_pwr: 71 clk_disable_unprepare(tdev->clk_ref); 72 err_clk_ref: 73 clk_disable_unprepare(tdev->clk); 74 err_clk: 75 if (tdev->vdd) 76 regulator_disable(tdev->vdd); 77 err_power: 78 return ret; 79 } 80 81 static int 82 nvkm_device_tegra_power_down(struct nvkm_device_tegra *tdev) 83 { 84 int ret; 85 86 clk_disable_unprepare(tdev->clk_pwr); 87 clk_disable_unprepare(tdev->clk_ref); 88 clk_disable_unprepare(tdev->clk); 89 udelay(10); 90 91 if (tdev->vdd) { 92 ret = regulator_disable(tdev->vdd); 93 if (ret) 94 return ret; 95 } 96 97 return 0; 98 } 99 100 static void 101 nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev) 102 { 103 #if IS_ENABLED(CONFIG_IOMMU_API) 104 struct device *dev = &tdev->pdev->dev; 105 unsigned long pgsize_bitmap; 106 int ret; 107 108 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) 109 if (dev->archdata.mapping) { 110 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev); 111 112 arm_iommu_detach_device(dev); 113 arm_iommu_release_mapping(mapping); 114 } 115 #endif 116 117 if (!tdev->func->iommu_bit) 118 return; 119 120 mutex_init(&tdev->iommu.mutex); 121 122 if (device_iommu_mapped(dev)) { 123 tdev->iommu.domain = iommu_paging_domain_alloc(dev); 124 if (IS_ERR(tdev->iommu.domain)) 125 goto error; 126 127 /* 128 * A IOMMU is only usable if it supports page sizes smaller 129 * or equal to the system's PAGE_SIZE, with a preference if 130 * both are equal. 131 */ 132 pgsize_bitmap = tdev->iommu.domain->pgsize_bitmap; 133 if (pgsize_bitmap & PAGE_SIZE) { 134 tdev->iommu.pgshift = PAGE_SHIFT; 135 } else { 136 tdev->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK); 137 if (tdev->iommu.pgshift == 0) { 138 dev_warn(dev, "unsupported IOMMU page size\n"); 139 goto free_domain; 140 } 141 tdev->iommu.pgshift -= 1; 142 } 143 144 ret = iommu_attach_device(tdev->iommu.domain, dev); 145 if (ret) 146 goto free_domain; 147 148 ret = nvkm_mm_init(&tdev->iommu.mm, 0, 0, 149 (1ULL << tdev->func->iommu_bit) >> 150 tdev->iommu.pgshift, 1); 151 if (ret) 152 goto detach_device; 153 } 154 155 return; 156 157 detach_device: 158 iommu_detach_device(tdev->iommu.domain, dev); 159 160 free_domain: 161 iommu_domain_free(tdev->iommu.domain); 162 163 error: 164 tdev->iommu.domain = NULL; 165 tdev->iommu.pgshift = 0; 166 dev_err(dev, "cannot initialize IOMMU MM\n"); 167 #endif 168 } 169 170 static void 171 nvkm_device_tegra_remove_iommu(struct nvkm_device_tegra *tdev) 172 { 173 #if IS_ENABLED(CONFIG_IOMMU_API) 174 if (tdev->iommu.domain) { 175 nvkm_mm_fini(&tdev->iommu.mm); 176 iommu_detach_device(tdev->iommu.domain, tdev->device.dev); 177 iommu_domain_free(tdev->iommu.domain); 178 } 179 #endif 180 } 181 182 static struct nvkm_device_tegra * 183 nvkm_device_tegra(struct nvkm_device *device) 184 { 185 return container_of(device, struct nvkm_device_tegra, device); 186 } 187 188 static struct resource * 189 nvkm_device_tegra_resource(struct nvkm_device *device, unsigned bar) 190 { 191 struct nvkm_device_tegra *tdev = nvkm_device_tegra(device); 192 return platform_get_resource(tdev->pdev, IORESOURCE_MEM, bar); 193 } 194 195 static resource_size_t 196 nvkm_device_tegra_resource_addr(struct nvkm_device *device, unsigned bar) 197 { 198 struct resource *res = nvkm_device_tegra_resource(device, bar); 199 return res ? res->start : 0; 200 } 201 202 static resource_size_t 203 nvkm_device_tegra_resource_size(struct nvkm_device *device, unsigned bar) 204 { 205 struct resource *res = nvkm_device_tegra_resource(device, bar); 206 return res ? resource_size(res) : 0; 207 } 208 209 static int 210 nvkm_device_tegra_irq(struct nvkm_device *device) 211 { 212 struct nvkm_device_tegra *tdev = nvkm_device_tegra(device); 213 214 return platform_get_irq_byname(tdev->pdev, "stall"); 215 } 216 217 static void * 218 nvkm_device_tegra_dtor(struct nvkm_device *device) 219 { 220 struct nvkm_device_tegra *tdev = nvkm_device_tegra(device); 221 nvkm_device_tegra_power_down(tdev); 222 nvkm_device_tegra_remove_iommu(tdev); 223 return tdev; 224 } 225 226 static const struct nvkm_device_func 227 nvkm_device_tegra_func = { 228 .tegra = nvkm_device_tegra, 229 .dtor = nvkm_device_tegra_dtor, 230 .irq = nvkm_device_tegra_irq, 231 .resource_addr = nvkm_device_tegra_resource_addr, 232 .resource_size = nvkm_device_tegra_resource_size, 233 .cpu_coherent = false, 234 }; 235 236 int 237 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func, 238 struct platform_device *pdev, 239 const char *cfg, const char *dbg, 240 struct nvkm_device **pdevice) 241 { 242 struct nvkm_device_tegra *tdev; 243 unsigned long rate; 244 int ret; 245 246 if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL))) 247 return -ENOMEM; 248 249 tdev->func = func; 250 tdev->pdev = pdev; 251 252 if (func->require_vdd) { 253 tdev->vdd = devm_regulator_get(&pdev->dev, "vdd"); 254 if (IS_ERR(tdev->vdd)) { 255 ret = PTR_ERR(tdev->vdd); 256 goto free; 257 } 258 } 259 260 tdev->rst = devm_reset_control_get(&pdev->dev, "gpu"); 261 if (IS_ERR(tdev->rst)) { 262 ret = PTR_ERR(tdev->rst); 263 goto free; 264 } 265 266 tdev->clk = devm_clk_get(&pdev->dev, "gpu"); 267 if (IS_ERR(tdev->clk)) { 268 ret = PTR_ERR(tdev->clk); 269 goto free; 270 } 271 272 rate = clk_get_rate(tdev->clk); 273 if (rate == 0) { 274 ret = clk_set_rate(tdev->clk, ULONG_MAX); 275 if (ret < 0) 276 goto free; 277 278 rate = clk_get_rate(tdev->clk); 279 280 dev_dbg(&pdev->dev, "GPU clock set to %lu\n", rate); 281 } 282 283 if (func->require_ref_clk) 284 tdev->clk_ref = devm_clk_get(&pdev->dev, "ref"); 285 if (IS_ERR(tdev->clk_ref)) { 286 ret = PTR_ERR(tdev->clk_ref); 287 goto free; 288 } 289 290 tdev->clk_pwr = devm_clk_get(&pdev->dev, "pwr"); 291 if (IS_ERR(tdev->clk_pwr)) { 292 ret = PTR_ERR(tdev->clk_pwr); 293 goto free; 294 } 295 296 /** 297 * The IOMMU bit defines the upper limit of the GPU-addressable space. 298 */ 299 ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(tdev->func->iommu_bit)); 300 if (ret) 301 goto free; 302 303 nvkm_device_tegra_probe_iommu(tdev); 304 305 ret = nvkm_device_tegra_power_up(tdev); 306 if (ret) 307 goto remove; 308 309 tdev->gpu_speedo = tegra_sku_info.gpu_speedo_value; 310 tdev->gpu_speedo_id = tegra_sku_info.gpu_speedo_id; 311 ret = nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev, 312 NVKM_DEVICE_TEGRA, pdev->id, NULL, 313 cfg, dbg, &tdev->device); 314 if (ret) 315 goto powerdown; 316 317 *pdevice = &tdev->device; 318 319 return 0; 320 321 powerdown: 322 nvkm_device_tegra_power_down(tdev); 323 remove: 324 nvkm_device_tegra_remove_iommu(tdev); 325 free: 326 kfree(tdev); 327 return ret; 328 } 329 #else 330 int 331 nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func, 332 struct platform_device *pdev, 333 const char *cfg, const char *dbg, 334 struct nvkm_device **pdevice) 335 { 336 return -ENOSYS; 337 } 338 #endif 339