1 /* 2 * Copyright (C) STMicroelectronics SA 2014 3 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics. 4 * License terms: GNU General Public License (GPL), version 2 5 */ 6 7 #include <drm/drmP.h> 8 9 #include <linux/component.h> 10 #include <linux/debugfs.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of_platform.h> 14 15 #include <drm/drm_atomic.h> 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_gem_cma_helper.h> 19 #include <drm/drm_fb_cma_helper.h> 20 21 #include "sti_crtc.h" 22 #include "sti_drv.h" 23 24 #define DRIVER_NAME "sti" 25 #define DRIVER_DESC "STMicroelectronics SoC DRM" 26 #define DRIVER_DATE "20140601" 27 #define DRIVER_MAJOR 1 28 #define DRIVER_MINOR 0 29 30 #define STI_MAX_FB_HEIGHT 4096 31 #define STI_MAX_FB_WIDTH 4096 32 33 static void sti_atomic_schedule(struct sti_private *private, 34 struct drm_atomic_state *state) 35 { 36 private->commit.state = state; 37 schedule_work(&private->commit.work); 38 } 39 40 static void sti_atomic_complete(struct sti_private *private, 41 struct drm_atomic_state *state) 42 { 43 struct drm_device *drm = private->drm_dev; 44 45 /* 46 * Everything below can be run asynchronously without the need to grab 47 * any modeset locks at all under one condition: It must be guaranteed 48 * that the asynchronous work has either been cancelled (if the driver 49 * supports it, which at least requires that the framebuffers get 50 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed 51 * before the new state gets committed on the software side with 52 * drm_atomic_helper_swap_state(). 53 * 54 * This scheme allows new atomic state updates to be prepared and 55 * checked in parallel to the asynchronous completion of the previous 56 * update. Which is important since compositors need to figure out the 57 * composition of the next frame right after having submitted the 58 * current layout. 59 */ 60 61 drm_atomic_helper_commit_modeset_disables(drm, state); 62 drm_atomic_helper_commit_planes(drm, state, false); 63 drm_atomic_helper_commit_modeset_enables(drm, state); 64 65 drm_atomic_helper_wait_for_vblanks(drm, state); 66 67 drm_atomic_helper_cleanup_planes(drm, state); 68 drm_atomic_state_free(state); 69 } 70 71 static void sti_atomic_work(struct work_struct *work) 72 { 73 struct sti_private *private = container_of(work, 74 struct sti_private, commit.work); 75 76 sti_atomic_complete(private, private->commit.state); 77 } 78 79 static int sti_atomic_commit(struct drm_device *drm, 80 struct drm_atomic_state *state, bool async) 81 { 82 struct sti_private *private = drm->dev_private; 83 int err; 84 85 err = drm_atomic_helper_prepare_planes(drm, state); 86 if (err) 87 return err; 88 89 /* serialize outstanding asynchronous commits */ 90 mutex_lock(&private->commit.lock); 91 flush_work(&private->commit.work); 92 93 /* 94 * This is the point of no return - everything below never fails except 95 * when the hw goes bonghits. Which means we can commit the new state on 96 * the software side now. 97 */ 98 99 drm_atomic_helper_swap_state(drm, state); 100 101 if (async) 102 sti_atomic_schedule(private, state); 103 else 104 sti_atomic_complete(private, state); 105 106 mutex_unlock(&private->commit.lock); 107 return 0; 108 } 109 110 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 111 .fb_create = drm_fb_cma_create, 112 .atomic_check = drm_atomic_helper_check, 113 .atomic_commit = sti_atomic_commit, 114 }; 115 116 static void sti_mode_config_init(struct drm_device *dev) 117 { 118 dev->mode_config.min_width = 0; 119 dev->mode_config.min_height = 0; 120 121 /* 122 * set max width and height as default value. 123 * this value would be used to check framebuffer size limitation 124 * at drm_mode_addfb(). 125 */ 126 dev->mode_config.max_width = STI_MAX_FB_WIDTH; 127 dev->mode_config.max_height = STI_MAX_FB_HEIGHT; 128 129 dev->mode_config.funcs = &sti_mode_config_funcs; 130 } 131 132 static int sti_load(struct drm_device *dev, unsigned long flags) 133 { 134 struct sti_private *private; 135 int ret; 136 137 private = kzalloc(sizeof(*private), GFP_KERNEL); 138 if (!private) { 139 DRM_ERROR("Failed to allocate private\n"); 140 return -ENOMEM; 141 } 142 dev->dev_private = (void *)private; 143 private->drm_dev = dev; 144 145 mutex_init(&private->commit.lock); 146 INIT_WORK(&private->commit.work, sti_atomic_work); 147 148 drm_mode_config_init(dev); 149 drm_kms_helper_poll_init(dev); 150 151 sti_mode_config_init(dev); 152 153 ret = component_bind_all(dev->dev, dev); 154 if (ret) { 155 drm_kms_helper_poll_fini(dev); 156 drm_mode_config_cleanup(dev); 157 kfree(private); 158 return ret; 159 } 160 161 drm_mode_config_reset(dev); 162 163 drm_fbdev_cma_init(dev, 32, 164 dev->mode_config.num_crtc, 165 dev->mode_config.num_connector); 166 167 return 0; 168 } 169 170 static const struct file_operations sti_driver_fops = { 171 .owner = THIS_MODULE, 172 .open = drm_open, 173 .mmap = drm_gem_cma_mmap, 174 .poll = drm_poll, 175 .read = drm_read, 176 .unlocked_ioctl = drm_ioctl, 177 #ifdef CONFIG_COMPAT 178 .compat_ioctl = drm_compat_ioctl, 179 #endif 180 .release = drm_release, 181 }; 182 183 static struct dma_buf *sti_gem_prime_export(struct drm_device *dev, 184 struct drm_gem_object *obj, 185 int flags) 186 { 187 /* we want to be able to write in mmapped buffer */ 188 flags |= O_RDWR; 189 return drm_gem_prime_export(dev, obj, flags); 190 } 191 192 static struct drm_driver sti_driver = { 193 .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET | 194 DRIVER_GEM | DRIVER_PRIME, 195 .load = sti_load, 196 .gem_free_object = drm_gem_cma_free_object, 197 .gem_vm_ops = &drm_gem_cma_vm_ops, 198 .dumb_create = drm_gem_cma_dumb_create, 199 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 200 .dumb_destroy = drm_gem_dumb_destroy, 201 .fops = &sti_driver_fops, 202 203 .get_vblank_counter = drm_vblank_no_hw_counter, 204 .enable_vblank = sti_crtc_enable_vblank, 205 .disable_vblank = sti_crtc_disable_vblank, 206 207 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 208 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 209 .gem_prime_export = sti_gem_prime_export, 210 .gem_prime_import = drm_gem_prime_import, 211 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 212 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 213 .gem_prime_vmap = drm_gem_cma_prime_vmap, 214 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 215 .gem_prime_mmap = drm_gem_cma_prime_mmap, 216 217 .name = DRIVER_NAME, 218 .desc = DRIVER_DESC, 219 .date = DRIVER_DATE, 220 .major = DRIVER_MAJOR, 221 .minor = DRIVER_MINOR, 222 }; 223 224 static int compare_of(struct device *dev, void *data) 225 { 226 return dev->of_node == data; 227 } 228 229 static int sti_bind(struct device *dev) 230 { 231 return drm_platform_init(&sti_driver, to_platform_device(dev)); 232 } 233 234 static void sti_unbind(struct device *dev) 235 { 236 drm_put_dev(dev_get_drvdata(dev)); 237 } 238 239 static const struct component_master_ops sti_ops = { 240 .bind = sti_bind, 241 .unbind = sti_unbind, 242 }; 243 244 static int sti_platform_probe(struct platform_device *pdev) 245 { 246 struct device *dev = &pdev->dev; 247 struct device_node *node = dev->of_node; 248 struct device_node *child_np; 249 struct component_match *match = NULL; 250 251 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 252 253 of_platform_populate(node, NULL, NULL, dev); 254 255 child_np = of_get_next_available_child(node, NULL); 256 257 while (child_np) { 258 component_match_add(dev, &match, compare_of, child_np); 259 of_node_put(child_np); 260 child_np = of_get_next_available_child(node, child_np); 261 } 262 263 return component_master_add_with_match(dev, &sti_ops, match); 264 } 265 266 static int sti_platform_remove(struct platform_device *pdev) 267 { 268 component_master_del(&pdev->dev, &sti_ops); 269 of_platform_depopulate(&pdev->dev); 270 271 return 0; 272 } 273 274 static const struct of_device_id sti_dt_ids[] = { 275 { .compatible = "st,sti-display-subsystem", }, 276 { /* end node */ }, 277 }; 278 MODULE_DEVICE_TABLE(of, sti_dt_ids); 279 280 static struct platform_driver sti_platform_driver = { 281 .probe = sti_platform_probe, 282 .remove = sti_platform_remove, 283 .driver = { 284 .name = DRIVER_NAME, 285 .of_match_table = sti_dt_ids, 286 }, 287 }; 288 289 static struct platform_driver * const drivers[] = { 290 &sti_tvout_driver, 291 &sti_vtac_driver, 292 &sti_hqvdp_driver, 293 &sti_hdmi_driver, 294 &sti_hda_driver, 295 &sti_dvo_driver, 296 &sti_vtg_driver, 297 &sti_compositor_driver, 298 &sti_platform_driver, 299 }; 300 301 static int sti_drm_init(void) 302 { 303 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 304 } 305 module_init(sti_drm_init); 306 307 static void sti_drm_exit(void) 308 { 309 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 310 } 311 module_exit(sti_drm_exit); 312 313 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 314 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 315 MODULE_LICENSE("GPL"); 316