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/module.h> 15 #include <linux/pci.h> 16 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_drv.h> 19 #include <drm/drm_gem_framebuffer_helper.h> 20 #include <drm/drm_gem_vram_helper.h> 21 #include <drm/drm_irq.h> 22 #include <drm/drm_managed.h> 23 #include <drm/drm_vblank.h> 24 25 #include "hibmc_drm_drv.h" 26 #include "hibmc_drm_regs.h" 27 28 DEFINE_DRM_GEM_FOPS(hibmc_fops); 29 30 static irqreturn_t hibmc_drm_interrupt(int irq, void *arg) 31 { 32 struct drm_device *dev = (struct drm_device *)arg; 33 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); 34 u32 status; 35 36 status = readl(priv->mmio + HIBMC_RAW_INTERRUPT); 37 38 if (status & HIBMC_RAW_INTERRUPT_VBLANK(1)) { 39 writel(HIBMC_RAW_INTERRUPT_VBLANK(1), 40 priv->mmio + HIBMC_RAW_INTERRUPT); 41 drm_handle_vblank(dev, 0); 42 } 43 44 return IRQ_HANDLED; 45 } 46 47 static int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev, 48 struct drm_mode_create_dumb *args) 49 { 50 return drm_gem_vram_fill_create_dumb(file, dev, 0, 128, args); 51 } 52 53 static const 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 .debugfs_init = drm_vram_mm_debugfs_init, 62 .dumb_create = hibmc_dumb_create, 63 .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, 64 .gem_prime_mmap = drm_gem_prime_mmap, 65 .irq_handler = hibmc_drm_interrupt, 66 }; 67 68 static int __maybe_unused hibmc_pm_suspend(struct device *dev) 69 { 70 struct drm_device *drm_dev = dev_get_drvdata(dev); 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 drm_device *drm_dev = dev_get_drvdata(dev); 78 79 return drm_mode_config_helper_resume(drm_dev); 80 } 81 82 static const struct dev_pm_ops hibmc_pm_ops = { 83 SET_SYSTEM_SLEEP_PM_OPS(hibmc_pm_suspend, 84 hibmc_pm_resume) 85 }; 86 87 static const struct drm_mode_config_funcs hibmc_mode_funcs = { 88 .mode_valid = drm_vram_helper_mode_valid, 89 .atomic_check = drm_atomic_helper_check, 90 .atomic_commit = drm_atomic_helper_commit, 91 .fb_create = drm_gem_fb_create, 92 }; 93 94 static int hibmc_kms_init(struct hibmc_drm_private *priv) 95 { 96 struct drm_device *dev = &priv->dev; 97 int ret; 98 99 ret = drmm_mode_config_init(dev); 100 if (ret) 101 return ret; 102 103 dev->mode_config.min_width = 0; 104 dev->mode_config.min_height = 0; 105 dev->mode_config.max_width = 1920; 106 dev->mode_config.max_height = 1200; 107 108 dev->mode_config.fb_base = priv->fb_base; 109 dev->mode_config.preferred_depth = 32; 110 dev->mode_config.prefer_shadow = 1; 111 112 dev->mode_config.funcs = (void *)&hibmc_mode_funcs; 113 114 ret = hibmc_de_init(priv); 115 if (ret) { 116 drm_err(dev, "failed to init de: %d\n", ret); 117 return ret; 118 } 119 120 ret = hibmc_vdac_init(priv); 121 if (ret) { 122 drm_err(dev, "failed to init vdac: %d\n", ret); 123 return ret; 124 } 125 126 return 0; 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, u32 power_mode) 133 { 134 u32 control_value = 0; 135 void __iomem *mmio = priv->mmio; 136 u32 input = 1; 137 138 if (power_mode > HIBMC_PW_MODE_CTL_MODE_SLEEP) 139 return; 140 141 if (power_mode == HIBMC_PW_MODE_CTL_MODE_SLEEP) 142 input = 0; 143 144 control_value = readl(mmio + HIBMC_POWER_MODE_CTRL); 145 control_value &= ~(HIBMC_PW_MODE_CTL_MODE_MASK | 146 HIBMC_PW_MODE_CTL_OSC_INPUT_MASK); 147 control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_MODE, power_mode); 148 control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_OSC_INPUT, input); 149 writel(control_value, mmio + HIBMC_POWER_MODE_CTRL); 150 } 151 152 void hibmc_set_current_gate(struct hibmc_drm_private *priv, unsigned int gate) 153 { 154 u32 gate_reg; 155 u32 mode; 156 void __iomem *mmio = priv->mmio; 157 158 /* Get current power mode. */ 159 mode = (readl(mmio + HIBMC_POWER_MODE_CTRL) & 160 HIBMC_PW_MODE_CTL_MODE_MASK) >> HIBMC_PW_MODE_CTL_MODE_SHIFT; 161 162 switch (mode) { 163 case HIBMC_PW_MODE_CTL_MODE_MODE0: 164 gate_reg = HIBMC_MODE0_GATE; 165 break; 166 167 case HIBMC_PW_MODE_CTL_MODE_MODE1: 168 gate_reg = HIBMC_MODE1_GATE; 169 break; 170 171 default: 172 gate_reg = HIBMC_MODE0_GATE; 173 break; 174 } 175 writel(gate, mmio + gate_reg); 176 } 177 178 static void hibmc_hw_config(struct hibmc_drm_private *priv) 179 { 180 u32 reg; 181 182 /* On hardware reset, power mode 0 is default. */ 183 hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0); 184 185 /* Enable display power gate & LOCALMEM power gate*/ 186 reg = readl(priv->mmio + HIBMC_CURRENT_GATE); 187 reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK; 188 reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK; 189 reg |= HIBMC_CURR_GATE_DISPLAY(1); 190 reg |= HIBMC_CURR_GATE_LOCALMEM(1); 191 192 hibmc_set_current_gate(priv, reg); 193 194 /* 195 * Reset the memory controller. If the memory controller 196 * is not reset in chip,the system might hang when sw accesses 197 * the memory.The memory should be resetted after 198 * changing the MXCLK. 199 */ 200 reg = readl(priv->mmio + HIBMC_MISC_CTRL); 201 reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK; 202 reg |= HIBMC_MSCCTL_LOCALMEM_RESET(0); 203 writel(reg, priv->mmio + HIBMC_MISC_CTRL); 204 205 reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK; 206 reg |= HIBMC_MSCCTL_LOCALMEM_RESET(1); 207 208 writel(reg, priv->mmio + HIBMC_MISC_CTRL); 209 } 210 211 static int hibmc_hw_map(struct hibmc_drm_private *priv) 212 { 213 struct drm_device *dev = &priv->dev; 214 struct pci_dev *pdev = dev->pdev; 215 resource_size_t addr, size, ioaddr, iosize; 216 217 ioaddr = pci_resource_start(pdev, 1); 218 iosize = pci_resource_len(pdev, 1); 219 priv->mmio = devm_ioremap(dev->dev, ioaddr, iosize); 220 if (!priv->mmio) { 221 drm_err(dev, "Cannot map mmio region\n"); 222 return -ENOMEM; 223 } 224 225 addr = pci_resource_start(pdev, 0); 226 size = pci_resource_len(pdev, 0); 227 priv->fb_map = devm_ioremap(dev->dev, addr, size); 228 if (!priv->fb_map) { 229 drm_err(dev, "Cannot map framebuffer\n"); 230 return -ENOMEM; 231 } 232 priv->fb_base = addr; 233 priv->fb_size = size; 234 235 return 0; 236 } 237 238 static int hibmc_hw_init(struct hibmc_drm_private *priv) 239 { 240 int ret; 241 242 ret = hibmc_hw_map(priv); 243 if (ret) 244 return ret; 245 246 hibmc_hw_config(priv); 247 248 return 0; 249 } 250 251 static int hibmc_unload(struct drm_device *dev) 252 { 253 drm_atomic_helper_shutdown(dev); 254 255 if (dev->irq_enabled) 256 drm_irq_uninstall(dev); 257 258 pci_disable_msi(dev->pdev); 259 260 return 0; 261 } 262 263 static int hibmc_load(struct drm_device *dev) 264 { 265 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); 266 int ret; 267 268 ret = hibmc_hw_init(priv); 269 if (ret) 270 goto err; 271 272 ret = drmm_vram_helper_init(dev, pci_resource_start(dev->pdev, 0), 273 priv->fb_size); 274 if (ret) { 275 drm_err(dev, "Error initializing VRAM MM; %d\n", ret); 276 goto err; 277 } 278 279 ret = hibmc_kms_init(priv); 280 if (ret) 281 goto err; 282 283 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 284 if (ret) { 285 drm_err(dev, "failed to initialize vblank: %d\n", ret); 286 goto err; 287 } 288 289 ret = pci_enable_msi(dev->pdev); 290 if (ret) { 291 drm_warn(dev, "enabling MSI failed: %d\n", ret); 292 } else { 293 ret = drm_irq_install(dev, dev->pdev->irq); 294 if (ret) 295 drm_warn(dev, "install irq failed: %d\n", ret); 296 } 297 298 /* reset all the states of crtc/plane/encoder/connector */ 299 drm_mode_config_reset(dev); 300 301 return 0; 302 303 err: 304 hibmc_unload(dev); 305 drm_err(dev, "failed to initialize drm driver: %d\n", ret); 306 return ret; 307 } 308 309 static int hibmc_pci_probe(struct pci_dev *pdev, 310 const struct pci_device_id *ent) 311 { 312 struct hibmc_drm_private *priv; 313 struct drm_device *dev; 314 int ret; 315 316 ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 317 "hibmcdrmfb"); 318 if (ret) 319 return ret; 320 321 priv = devm_drm_dev_alloc(&pdev->dev, &hibmc_driver, 322 struct hibmc_drm_private, dev); 323 if (IS_ERR(priv)) { 324 DRM_ERROR("failed to allocate drm_device\n"); 325 return PTR_ERR(priv); 326 } 327 328 dev = &priv->dev; 329 dev->pdev = pdev; 330 pci_set_drvdata(pdev, dev); 331 332 ret = pcim_enable_device(pdev); 333 if (ret) { 334 drm_err(dev, "failed to enable pci device: %d\n", ret); 335 goto err_free; 336 } 337 338 ret = hibmc_load(dev); 339 if (ret) { 340 drm_err(dev, "failed to load hibmc: %d\n", ret); 341 goto err_free; 342 } 343 344 ret = drm_dev_register(dev, 0); 345 if (ret) { 346 drm_err(dev, "failed to register drv for userspace access: %d\n", 347 ret); 348 goto err_unload; 349 } 350 351 drm_fbdev_generic_setup(dev, dev->mode_config.preferred_depth); 352 353 return 0; 354 355 err_unload: 356 hibmc_unload(dev); 357 err_free: 358 drm_dev_put(dev); 359 360 return ret; 361 } 362 363 static void hibmc_pci_remove(struct pci_dev *pdev) 364 { 365 struct drm_device *dev = pci_get_drvdata(pdev); 366 367 drm_dev_unregister(dev); 368 hibmc_unload(dev); 369 } 370 371 static const struct pci_device_id hibmc_pci_table[] = { 372 { PCI_VDEVICE(HUAWEI, 0x1711) }, 373 {0,} 374 }; 375 376 static struct pci_driver hibmc_pci_driver = { 377 .name = "hibmc-drm", 378 .id_table = hibmc_pci_table, 379 .probe = hibmc_pci_probe, 380 .remove = hibmc_pci_remove, 381 .driver.pm = &hibmc_pm_ops, 382 }; 383 384 module_pci_driver(hibmc_pci_driver); 385 386 MODULE_DEVICE_TABLE(pci, hibmc_pci_table); 387 MODULE_AUTHOR("RongrongZou <zourongrong@huawei.com>"); 388 MODULE_DESCRIPTION("DRM Driver for Hisilicon Hibmc"); 389 MODULE_LICENSE("GPL v2"); 390