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_aperture.h> 18 #include <drm/drm_atomic_helper.h> 19 #include <drm/drm_drv.h> 20 #include <drm/drm_fbdev_generic.h> 21 #include <drm/drm_gem_framebuffer_helper.h> 22 #include <drm/drm_gem_vram_helper.h> 23 #include <drm/drm_managed.h> 24 #include <drm/drm_module.h> 25 #include <drm/drm_vblank.h> 26 27 #include "hibmc_drm_drv.h" 28 #include "hibmc_drm_regs.h" 29 30 DEFINE_DRM_GEM_FOPS(hibmc_fops); 31 32 static irqreturn_t hibmc_interrupt(int irq, void *arg) 33 { 34 struct drm_device *dev = (struct drm_device *)arg; 35 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); 36 u32 status; 37 38 status = readl(priv->mmio + HIBMC_RAW_INTERRUPT); 39 40 if (status & HIBMC_RAW_INTERRUPT_VBLANK(1)) { 41 writel(HIBMC_RAW_INTERRUPT_VBLANK(1), 42 priv->mmio + HIBMC_RAW_INTERRUPT); 43 drm_handle_vblank(dev, 0); 44 } 45 46 return IRQ_HANDLED; 47 } 48 49 static int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev, 50 struct drm_mode_create_dumb *args) 51 { 52 return drm_gem_vram_fill_create_dumb(file, dev, 0, 128, args); 53 } 54 55 static const struct drm_driver hibmc_driver = { 56 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 57 .fops = &hibmc_fops, 58 .name = "hibmc", 59 .date = "20160828", 60 .desc = "hibmc drm driver", 61 .major = 1, 62 .minor = 0, 63 .debugfs_init = drm_vram_mm_debugfs_init, 64 .dumb_create = hibmc_dumb_create, 65 .dumb_map_offset = drm_gem_ttm_dumb_map_offset, 66 .gem_prime_mmap = drm_gem_prime_mmap, 67 }; 68 69 static int __maybe_unused hibmc_pm_suspend(struct device *dev) 70 { 71 struct drm_device *drm_dev = dev_get_drvdata(dev); 72 73 return drm_mode_config_helper_suspend(drm_dev); 74 } 75 76 static int __maybe_unused hibmc_pm_resume(struct device *dev) 77 { 78 struct drm_device *drm_dev = dev_get_drvdata(dev); 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 const struct drm_mode_config_funcs hibmc_mode_funcs = { 89 .mode_valid = drm_vram_helper_mode_valid, 90 .atomic_check = drm_atomic_helper_check, 91 .atomic_commit = drm_atomic_helper_commit, 92 .fb_create = drm_gem_fb_create, 93 }; 94 95 static int hibmc_kms_init(struct hibmc_drm_private *priv) 96 { 97 struct drm_device *dev = &priv->dev; 98 int ret; 99 100 ret = drmm_mode_config_init(dev); 101 if (ret) 102 return ret; 103 104 dev->mode_config.min_width = 0; 105 dev->mode_config.min_height = 0; 106 dev->mode_config.max_width = 1920; 107 dev->mode_config.max_height = 1200; 108 109 dev->mode_config.preferred_depth = 24; 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 = to_pci_dev(dev->dev); 215 resource_size_t 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 return 0; 226 } 227 228 static int hibmc_hw_init(struct hibmc_drm_private *priv) 229 { 230 int ret; 231 232 ret = hibmc_hw_map(priv); 233 if (ret) 234 return ret; 235 236 hibmc_hw_config(priv); 237 238 return 0; 239 } 240 241 static int hibmc_unload(struct drm_device *dev) 242 { 243 struct pci_dev *pdev = to_pci_dev(dev->dev); 244 245 drm_atomic_helper_shutdown(dev); 246 247 free_irq(pdev->irq, dev); 248 249 pci_disable_msi(to_pci_dev(dev->dev)); 250 251 return 0; 252 } 253 254 static int hibmc_load(struct drm_device *dev) 255 { 256 struct pci_dev *pdev = to_pci_dev(dev->dev); 257 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); 258 int ret; 259 260 ret = hibmc_hw_init(priv); 261 if (ret) 262 goto err; 263 264 ret = drmm_vram_helper_init(dev, pci_resource_start(pdev, 0), 265 pci_resource_len(pdev, 0)); 266 if (ret) { 267 drm_err(dev, "Error initializing VRAM MM; %d\n", ret); 268 goto err; 269 } 270 271 ret = hibmc_kms_init(priv); 272 if (ret) 273 goto err; 274 275 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 276 if (ret) { 277 drm_err(dev, "failed to initialize vblank: %d\n", ret); 278 goto err; 279 } 280 281 ret = pci_enable_msi(pdev); 282 if (ret) { 283 drm_warn(dev, "enabling MSI failed: %d\n", ret); 284 } else { 285 /* PCI devices require shared interrupts. */ 286 ret = request_irq(pdev->irq, hibmc_interrupt, IRQF_SHARED, 287 dev->driver->name, dev); 288 if (ret) 289 drm_warn(dev, "install irq failed: %d\n", ret); 290 } 291 292 /* reset all the states of crtc/plane/encoder/connector */ 293 drm_mode_config_reset(dev); 294 295 return 0; 296 297 err: 298 hibmc_unload(dev); 299 drm_err(dev, "failed to initialize drm driver: %d\n", ret); 300 return ret; 301 } 302 303 static int hibmc_pci_probe(struct pci_dev *pdev, 304 const struct pci_device_id *ent) 305 { 306 struct hibmc_drm_private *priv; 307 struct drm_device *dev; 308 int ret; 309 310 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &hibmc_driver); 311 if (ret) 312 return ret; 313 314 priv = devm_drm_dev_alloc(&pdev->dev, &hibmc_driver, 315 struct hibmc_drm_private, dev); 316 if (IS_ERR(priv)) { 317 DRM_ERROR("failed to allocate drm_device\n"); 318 return PTR_ERR(priv); 319 } 320 321 dev = &priv->dev; 322 pci_set_drvdata(pdev, dev); 323 324 ret = pcim_enable_device(pdev); 325 if (ret) { 326 drm_err(dev, "failed to enable pci device: %d\n", ret); 327 goto err_return; 328 } 329 330 ret = hibmc_load(dev); 331 if (ret) { 332 drm_err(dev, "failed to load hibmc: %d\n", ret); 333 goto err_return; 334 } 335 336 ret = drm_dev_register(dev, 0); 337 if (ret) { 338 drm_err(dev, "failed to register drv for userspace access: %d\n", 339 ret); 340 goto err_unload; 341 } 342 343 drm_fbdev_generic_setup(dev, 32); 344 345 return 0; 346 347 err_unload: 348 hibmc_unload(dev); 349 err_return: 350 return ret; 351 } 352 353 static void hibmc_pci_remove(struct pci_dev *pdev) 354 { 355 struct drm_device *dev = pci_get_drvdata(pdev); 356 357 drm_dev_unregister(dev); 358 hibmc_unload(dev); 359 } 360 361 static const struct pci_device_id hibmc_pci_table[] = { 362 { PCI_VDEVICE(HUAWEI, 0x1711) }, 363 {0,} 364 }; 365 366 static struct pci_driver hibmc_pci_driver = { 367 .name = "hibmc-drm", 368 .id_table = hibmc_pci_table, 369 .probe = hibmc_pci_probe, 370 .remove = hibmc_pci_remove, 371 .driver.pm = &hibmc_pm_ops, 372 }; 373 374 drm_module_pci_driver(hibmc_pci_driver); 375 376 MODULE_DEVICE_TABLE(pci, hibmc_pci_table); 377 MODULE_AUTHOR("RongrongZou <zourongrong@huawei.com>"); 378 MODULE_DESCRIPTION("DRM Driver for Hisilicon Hibmc"); 379 MODULE_LICENSE("GPL v2"); 380