1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Hisilicon Hibmc SoC drm driver 3 * 4 * Based on the bochs drm driver. 5 * 6 * Copyright (c) 2016 Huawei Limited. 7 * 8 * Author: 9 * Rongrong Zou <zourongrong@huawei.com> 10 * Rongrong Zou <zourongrong@gmail.com> 11 * Jianhua Li <lijianhua@huawei.com> 12 */ 13 14 #include <linux/console.h> 15 #include <linux/module.h> 16 #include <linux/pci.h> 17 18 #include <drm/drm_atomic_helper.h> 19 #include <drm/drm_drv.h> 20 #include <drm/drm_gem_vram_helper.h> 21 #include <drm/drm_irq.h> 22 #include <drm/drm_print.h> 23 #include <drm/drm_probe_helper.h> 24 #include <drm/drm_vblank.h> 25 #include <drm/drm_vram_mm_helper.h> 26 27 #include "hibmc_drm_drv.h" 28 #include "hibmc_drm_regs.h" 29 30 static const struct file_operations hibmc_fops = { 31 .owner = THIS_MODULE, 32 DRM_VRAM_MM_FILE_OPERATIONS 33 }; 34 35 static irqreturn_t hibmc_drm_interrupt(int irq, void *arg) 36 { 37 struct drm_device *dev = (struct drm_device *)arg; 38 struct hibmc_drm_private *priv = 39 (struct hibmc_drm_private *)dev->dev_private; 40 u32 status; 41 42 status = readl(priv->mmio + HIBMC_RAW_INTERRUPT); 43 44 if (status & HIBMC_RAW_INTERRUPT_VBLANK(1)) { 45 writel(HIBMC_RAW_INTERRUPT_VBLANK(1), 46 priv->mmio + HIBMC_RAW_INTERRUPT); 47 drm_handle_vblank(dev, 0); 48 } 49 50 return IRQ_HANDLED; 51 } 52 53 static struct drm_driver hibmc_driver = { 54 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 55 .fops = &hibmc_fops, 56 .name = "hibmc", 57 .date = "20160828", 58 .desc = "hibmc drm driver", 59 .major = 1, 60 .minor = 0, 61 .dumb_create = hibmc_dumb_create, 62 .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, 63 .gem_prime_mmap = drm_gem_prime_mmap, 64 .irq_handler = hibmc_drm_interrupt, 65 }; 66 67 static int __maybe_unused hibmc_pm_suspend(struct device *dev) 68 { 69 struct pci_dev *pdev = to_pci_dev(dev); 70 struct drm_device *drm_dev = pci_get_drvdata(pdev); 71 72 return drm_mode_config_helper_suspend(drm_dev); 73 } 74 75 static int __maybe_unused hibmc_pm_resume(struct device *dev) 76 { 77 struct pci_dev *pdev = to_pci_dev(dev); 78 struct drm_device *drm_dev = pci_get_drvdata(pdev); 79 80 return drm_mode_config_helper_resume(drm_dev); 81 } 82 83 static const struct dev_pm_ops hibmc_pm_ops = { 84 SET_SYSTEM_SLEEP_PM_OPS(hibmc_pm_suspend, 85 hibmc_pm_resume) 86 }; 87 88 static int hibmc_kms_init(struct hibmc_drm_private *priv) 89 { 90 int ret; 91 92 drm_mode_config_init(priv->dev); 93 priv->mode_config_initialized = true; 94 95 priv->dev->mode_config.min_width = 0; 96 priv->dev->mode_config.min_height = 0; 97 priv->dev->mode_config.max_width = 1920; 98 priv->dev->mode_config.max_height = 1440; 99 100 priv->dev->mode_config.fb_base = priv->fb_base; 101 priv->dev->mode_config.preferred_depth = 24; 102 priv->dev->mode_config.prefer_shadow = 0; 103 104 priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs; 105 106 ret = hibmc_de_init(priv); 107 if (ret) { 108 DRM_ERROR("failed to init de: %d\n", ret); 109 return ret; 110 } 111 112 ret = hibmc_vdac_init(priv); 113 if (ret) { 114 DRM_ERROR("failed to init vdac: %d\n", ret); 115 return ret; 116 } 117 118 return 0; 119 } 120 121 static void hibmc_kms_fini(struct hibmc_drm_private *priv) 122 { 123 if (priv->mode_config_initialized) { 124 drm_mode_config_cleanup(priv->dev); 125 priv->mode_config_initialized = false; 126 } 127 } 128 129 /* 130 * It can operate in one of three modes: 0, 1 or Sleep. 131 */ 132 void hibmc_set_power_mode(struct hibmc_drm_private *priv, 133 unsigned int power_mode) 134 { 135 unsigned int control_value = 0; 136 void __iomem *mmio = priv->mmio; 137 unsigned int input = 1; 138 139 if (power_mode > HIBMC_PW_MODE_CTL_MODE_SLEEP) 140 return; 141 142 if (power_mode == HIBMC_PW_MODE_CTL_MODE_SLEEP) 143 input = 0; 144 145 control_value = readl(mmio + HIBMC_POWER_MODE_CTRL); 146 control_value &= ~(HIBMC_PW_MODE_CTL_MODE_MASK | 147 HIBMC_PW_MODE_CTL_OSC_INPUT_MASK); 148 control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_MODE, power_mode); 149 control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_OSC_INPUT, input); 150 writel(control_value, mmio + HIBMC_POWER_MODE_CTRL); 151 } 152 153 void hibmc_set_current_gate(struct hibmc_drm_private *priv, unsigned int gate) 154 { 155 unsigned int gate_reg; 156 unsigned int mode; 157 void __iomem *mmio = priv->mmio; 158 159 /* Get current power mode. */ 160 mode = (readl(mmio + HIBMC_POWER_MODE_CTRL) & 161 HIBMC_PW_MODE_CTL_MODE_MASK) >> HIBMC_PW_MODE_CTL_MODE_SHIFT; 162 163 switch (mode) { 164 case HIBMC_PW_MODE_CTL_MODE_MODE0: 165 gate_reg = HIBMC_MODE0_GATE; 166 break; 167 168 case HIBMC_PW_MODE_CTL_MODE_MODE1: 169 gate_reg = HIBMC_MODE1_GATE; 170 break; 171 172 default: 173 gate_reg = HIBMC_MODE0_GATE; 174 break; 175 } 176 writel(gate, mmio + gate_reg); 177 } 178 179 static void hibmc_hw_config(struct hibmc_drm_private *priv) 180 { 181 unsigned int reg; 182 183 /* On hardware reset, power mode 0 is default. */ 184 hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0); 185 186 /* Enable display power gate & LOCALMEM power gate*/ 187 reg = readl(priv->mmio + HIBMC_CURRENT_GATE); 188 reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK; 189 reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK; 190 reg |= HIBMC_CURR_GATE_DISPLAY(1); 191 reg |= HIBMC_CURR_GATE_LOCALMEM(1); 192 193 hibmc_set_current_gate(priv, reg); 194 195 /* 196 * Reset the memory controller. If the memory controller 197 * is not reset in chip,the system might hang when sw accesses 198 * the memory.The memory should be resetted after 199 * changing the MXCLK. 200 */ 201 reg = readl(priv->mmio + HIBMC_MISC_CTRL); 202 reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK; 203 reg |= HIBMC_MSCCTL_LOCALMEM_RESET(0); 204 writel(reg, priv->mmio + HIBMC_MISC_CTRL); 205 206 reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK; 207 reg |= HIBMC_MSCCTL_LOCALMEM_RESET(1); 208 209 writel(reg, priv->mmio + HIBMC_MISC_CTRL); 210 } 211 212 static int hibmc_hw_map(struct hibmc_drm_private *priv) 213 { 214 struct drm_device *dev = priv->dev; 215 struct pci_dev *pdev = dev->pdev; 216 resource_size_t addr, size, ioaddr, iosize; 217 218 ioaddr = pci_resource_start(pdev, 1); 219 iosize = pci_resource_len(pdev, 1); 220 priv->mmio = devm_ioremap_nocache(dev->dev, ioaddr, iosize); 221 if (!priv->mmio) { 222 DRM_ERROR("Cannot map mmio region\n"); 223 return -ENOMEM; 224 } 225 226 addr = pci_resource_start(pdev, 0); 227 size = pci_resource_len(pdev, 0); 228 priv->fb_map = devm_ioremap(dev->dev, addr, size); 229 if (!priv->fb_map) { 230 DRM_ERROR("Cannot map framebuffer\n"); 231 return -ENOMEM; 232 } 233 priv->fb_base = addr; 234 priv->fb_size = size; 235 236 return 0; 237 } 238 239 static int hibmc_hw_init(struct hibmc_drm_private *priv) 240 { 241 int ret; 242 243 ret = hibmc_hw_map(priv); 244 if (ret) 245 return ret; 246 247 hibmc_hw_config(priv); 248 249 return 0; 250 } 251 252 static int hibmc_unload(struct drm_device *dev) 253 { 254 struct hibmc_drm_private *priv = dev->dev_private; 255 256 hibmc_fbdev_fini(priv); 257 258 drm_atomic_helper_shutdown(dev); 259 260 if (dev->irq_enabled) 261 drm_irq_uninstall(dev); 262 if (priv->msi_enabled) 263 pci_disable_msi(dev->pdev); 264 265 hibmc_kms_fini(priv); 266 hibmc_mm_fini(priv); 267 dev->dev_private = NULL; 268 return 0; 269 } 270 271 static int hibmc_load(struct drm_device *dev) 272 { 273 struct hibmc_drm_private *priv; 274 int ret; 275 276 priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL); 277 if (!priv) { 278 DRM_ERROR("no memory to allocate for hibmc_drm_private\n"); 279 return -ENOMEM; 280 } 281 dev->dev_private = priv; 282 priv->dev = dev; 283 284 ret = hibmc_hw_init(priv); 285 if (ret) 286 goto err; 287 288 ret = hibmc_mm_init(priv); 289 if (ret) 290 goto err; 291 292 ret = hibmc_kms_init(priv); 293 if (ret) 294 goto err; 295 296 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 297 if (ret) { 298 DRM_ERROR("failed to initialize vblank: %d\n", ret); 299 goto err; 300 } 301 302 priv->msi_enabled = 0; 303 ret = pci_enable_msi(dev->pdev); 304 if (ret) { 305 DRM_WARN("enabling MSI failed: %d\n", ret); 306 } else { 307 priv->msi_enabled = 1; 308 ret = drm_irq_install(dev, dev->pdev->irq); 309 if (ret) 310 DRM_WARN("install irq failed: %d\n", ret); 311 } 312 313 /* reset all the states of crtc/plane/encoder/connector */ 314 drm_mode_config_reset(dev); 315 316 ret = hibmc_fbdev_init(priv); 317 if (ret) { 318 DRM_ERROR("failed to initialize fbdev: %d\n", ret); 319 goto err; 320 } 321 322 return 0; 323 324 err: 325 hibmc_unload(dev); 326 DRM_ERROR("failed to initialize drm driver: %d\n", ret); 327 return ret; 328 } 329 330 static int hibmc_pci_probe(struct pci_dev *pdev, 331 const struct pci_device_id *ent) 332 { 333 struct drm_device *dev; 334 int ret; 335 336 dev = drm_dev_alloc(&hibmc_driver, &pdev->dev); 337 if (IS_ERR(dev)) { 338 DRM_ERROR("failed to allocate drm_device\n"); 339 return PTR_ERR(dev); 340 } 341 342 dev->pdev = pdev; 343 pci_set_drvdata(pdev, dev); 344 345 ret = pci_enable_device(pdev); 346 if (ret) { 347 DRM_ERROR("failed to enable pci device: %d\n", ret); 348 goto err_free; 349 } 350 351 ret = hibmc_load(dev); 352 if (ret) { 353 DRM_ERROR("failed to load hibmc: %d\n", ret); 354 goto err_disable; 355 } 356 357 ret = drm_dev_register(dev, 0); 358 if (ret) { 359 DRM_ERROR("failed to register drv for userspace access: %d\n", 360 ret); 361 goto err_unload; 362 } 363 return 0; 364 365 err_unload: 366 hibmc_unload(dev); 367 err_disable: 368 pci_disable_device(pdev); 369 err_free: 370 drm_dev_put(dev); 371 372 return ret; 373 } 374 375 static void hibmc_pci_remove(struct pci_dev *pdev) 376 { 377 struct drm_device *dev = pci_get_drvdata(pdev); 378 379 drm_dev_unregister(dev); 380 hibmc_unload(dev); 381 drm_dev_put(dev); 382 } 383 384 static struct pci_device_id hibmc_pci_table[] = { 385 { PCI_VDEVICE(HUAWEI, 0x1711) }, 386 {0,} 387 }; 388 389 static struct pci_driver hibmc_pci_driver = { 390 .name = "hibmc-drm", 391 .id_table = hibmc_pci_table, 392 .probe = hibmc_pci_probe, 393 .remove = hibmc_pci_remove, 394 .driver.pm = &hibmc_pm_ops, 395 }; 396 397 static int __init hibmc_init(void) 398 { 399 return pci_register_driver(&hibmc_pci_driver); 400 } 401 402 static void __exit hibmc_exit(void) 403 { 404 return pci_unregister_driver(&hibmc_pci_driver); 405 } 406 407 module_init(hibmc_init); 408 module_exit(hibmc_exit); 409 410 MODULE_DEVICE_TABLE(pci, hibmc_pci_table); 411 MODULE_AUTHOR("RongrongZou <zourongrong@huawei.com>"); 412 MODULE_DESCRIPTION("DRM Driver for Hisilicon Hibmc"); 413 MODULE_LICENSE("GPL v2"); 414