1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics SA 2014 4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics. 5 */ 6 7 #include <linux/component.h> 8 #include <linux/debugfs.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/of_platform.h> 14 #include <linux/platform_device.h> 15 16 #include <drm/drm_atomic.h> 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_client_setup.h> 19 #include <drm/drm_debugfs.h> 20 #include <drm/drm_drv.h> 21 #include <drm/drm_fbdev_dma.h> 22 #include <drm/drm_gem_dma_helper.h> 23 #include <drm/drm_gem_framebuffer_helper.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_probe_helper.h> 26 27 #include "sti_drv.h" 28 #include "sti_plane.h" 29 30 #define DRIVER_NAME "sti" 31 #define DRIVER_DESC "STMicroelectronics SoC DRM" 32 #define DRIVER_DATE "20140601" 33 #define DRIVER_MAJOR 1 34 #define DRIVER_MINOR 0 35 36 #define STI_MAX_FB_HEIGHT 4096 37 #define STI_MAX_FB_WIDTH 4096 38 39 static int sti_drm_fps_get(void *data, u64 *val) 40 { 41 struct drm_device *drm_dev = data; 42 struct drm_plane *p; 43 unsigned int i = 0; 44 45 *val = 0; 46 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 47 struct sti_plane *plane = to_sti_plane(p); 48 49 *val |= plane->fps_info.output << i; 50 i++; 51 } 52 53 return 0; 54 } 55 56 static int sti_drm_fps_set(void *data, u64 val) 57 { 58 struct drm_device *drm_dev = data; 59 struct drm_plane *p; 60 unsigned int i = 0; 61 62 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 63 struct sti_plane *plane = to_sti_plane(p); 64 65 memset(&plane->fps_info, 0, sizeof(plane->fps_info)); 66 plane->fps_info.output = (val >> i) & 1; 67 68 i++; 69 } 70 71 return 0; 72 } 73 74 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops, 75 sti_drm_fps_get, sti_drm_fps_set, "%llu\n"); 76 77 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data) 78 { 79 struct drm_info_node *node = s->private; 80 struct drm_device *dev = node->minor->dev; 81 struct drm_plane *p; 82 83 list_for_each_entry(p, &dev->mode_config.plane_list, head) { 84 struct sti_plane *plane = to_sti_plane(p); 85 86 seq_printf(s, "%s%s\n", 87 plane->fps_info.fps_str, 88 plane->fps_info.fips_str); 89 } 90 91 return 0; 92 } 93 94 static struct drm_info_list sti_drm_dbg_list[] = { 95 {"fps_get", sti_drm_fps_dbg_show, 0}, 96 }; 97 98 static void sti_drm_dbg_init(struct drm_minor *minor) 99 { 100 drm_debugfs_create_files(sti_drm_dbg_list, 101 ARRAY_SIZE(sti_drm_dbg_list), 102 minor->debugfs_root, minor); 103 104 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root, 105 minor->dev, &sti_drm_fps_fops); 106 107 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME); 108 } 109 110 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 111 .fb_create = drm_gem_fb_create, 112 .atomic_check = drm_atomic_helper_check, 113 .atomic_commit = drm_atomic_helper_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 dev->mode_config.normalize_zpos = true; 132 } 133 134 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops); 135 136 static const struct drm_driver sti_driver = { 137 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 138 .fops = &sti_driver_fops, 139 DRM_GEM_DMA_DRIVER_OPS, 140 DRM_FBDEV_DMA_DRIVER_OPS, 141 142 .debugfs_init = sti_drm_dbg_init, 143 144 .name = DRIVER_NAME, 145 .desc = DRIVER_DESC, 146 .date = DRIVER_DATE, 147 .major = DRIVER_MAJOR, 148 .minor = DRIVER_MINOR, 149 }; 150 151 static int sti_init(struct drm_device *ddev) 152 { 153 struct sti_private *private; 154 155 private = kzalloc(sizeof(*private), GFP_KERNEL); 156 if (!private) 157 return -ENOMEM; 158 159 ddev->dev_private = (void *)private; 160 dev_set_drvdata(ddev->dev, ddev); 161 private->drm_dev = ddev; 162 163 drm_mode_config_init(ddev); 164 165 sti_mode_config_init(ddev); 166 167 drm_kms_helper_poll_init(ddev); 168 169 return 0; 170 } 171 172 static void sti_cleanup(struct drm_device *ddev) 173 { 174 struct sti_private *private = ddev->dev_private; 175 176 drm_kms_helper_poll_fini(ddev); 177 drm_atomic_helper_shutdown(ddev); 178 drm_mode_config_cleanup(ddev); 179 component_unbind_all(ddev->dev, ddev); 180 dev_set_drvdata(ddev->dev, NULL); 181 kfree(private); 182 ddev->dev_private = NULL; 183 } 184 185 static int sti_bind(struct device *dev) 186 { 187 struct drm_device *ddev; 188 int ret; 189 190 ddev = drm_dev_alloc(&sti_driver, dev); 191 if (IS_ERR(ddev)) 192 return PTR_ERR(ddev); 193 194 ret = sti_init(ddev); 195 if (ret) 196 goto err_drm_dev_put; 197 198 ret = component_bind_all(ddev->dev, ddev); 199 if (ret) 200 goto err_cleanup; 201 202 ret = drm_dev_register(ddev, 0); 203 if (ret) 204 goto err_cleanup; 205 206 drm_mode_config_reset(ddev); 207 208 drm_client_setup(ddev, NULL); 209 210 return 0; 211 212 err_cleanup: 213 sti_cleanup(ddev); 214 err_drm_dev_put: 215 drm_dev_put(ddev); 216 return ret; 217 } 218 219 static void sti_unbind(struct device *dev) 220 { 221 struct drm_device *ddev = dev_get_drvdata(dev); 222 223 drm_dev_unregister(ddev); 224 sti_cleanup(ddev); 225 drm_dev_put(ddev); 226 } 227 228 static const struct component_master_ops sti_ops = { 229 .bind = sti_bind, 230 .unbind = sti_unbind, 231 }; 232 233 static int sti_platform_probe(struct platform_device *pdev) 234 { 235 struct device *dev = &pdev->dev; 236 struct device_node *node = dev->of_node; 237 struct device_node *child_np; 238 struct component_match *match = NULL; 239 240 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 241 242 devm_of_platform_populate(dev); 243 244 child_np = of_get_next_available_child(node, NULL); 245 246 while (child_np) { 247 drm_of_component_match_add(dev, &match, component_compare_of, 248 child_np); 249 child_np = of_get_next_available_child(node, child_np); 250 } 251 252 return component_master_add_with_match(dev, &sti_ops, match); 253 } 254 255 static void sti_platform_remove(struct platform_device *pdev) 256 { 257 component_master_del(&pdev->dev, &sti_ops); 258 } 259 260 static void sti_platform_shutdown(struct platform_device *pdev) 261 { 262 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 263 } 264 265 static const struct of_device_id sti_dt_ids[] = { 266 { .compatible = "st,sti-display-subsystem", }, 267 { /* end node */ }, 268 }; 269 MODULE_DEVICE_TABLE(of, sti_dt_ids); 270 271 static struct platform_driver sti_platform_driver = { 272 .probe = sti_platform_probe, 273 .remove = sti_platform_remove, 274 .shutdown = sti_platform_shutdown, 275 .driver = { 276 .name = DRIVER_NAME, 277 .of_match_table = sti_dt_ids, 278 }, 279 }; 280 281 static struct platform_driver * const drivers[] = { 282 &sti_tvout_driver, 283 &sti_hqvdp_driver, 284 &sti_hdmi_driver, 285 &sti_hda_driver, 286 &sti_dvo_driver, 287 &sti_vtg_driver, 288 &sti_compositor_driver, 289 &sti_platform_driver, 290 }; 291 292 static int sti_drm_init(void) 293 { 294 if (drm_firmware_drivers_only()) 295 return -ENODEV; 296 297 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 298 } 299 module_init(sti_drm_init); 300 301 static void sti_drm_exit(void) 302 { 303 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 304 } 305 module_exit(sti_drm_exit); 306 307 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 308 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 309 MODULE_LICENSE("GPL"); 310