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_debugfs.h> 19 #include <drm/drm_drv.h> 20 #include <drm/drm_fbdev_dma.h> 21 #include <drm/drm_gem_dma_helper.h> 22 #include <drm/drm_gem_framebuffer_helper.h> 23 #include <drm/drm_of.h> 24 #include <drm/drm_probe_helper.h> 25 26 #include "sti_drv.h" 27 #include "sti_plane.h" 28 29 #define DRIVER_NAME "sti" 30 #define DRIVER_DESC "STMicroelectronics SoC DRM" 31 #define DRIVER_DATE "20140601" 32 #define DRIVER_MAJOR 1 33 #define DRIVER_MINOR 0 34 35 #define STI_MAX_FB_HEIGHT 4096 36 #define STI_MAX_FB_WIDTH 4096 37 38 static int sti_drm_fps_get(void *data, u64 *val) 39 { 40 struct drm_device *drm_dev = data; 41 struct drm_plane *p; 42 unsigned int i = 0; 43 44 *val = 0; 45 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 46 struct sti_plane *plane = to_sti_plane(p); 47 48 *val |= plane->fps_info.output << i; 49 i++; 50 } 51 52 return 0; 53 } 54 55 static int sti_drm_fps_set(void *data, u64 val) 56 { 57 struct drm_device *drm_dev = data; 58 struct drm_plane *p; 59 unsigned int i = 0; 60 61 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 62 struct sti_plane *plane = to_sti_plane(p); 63 64 memset(&plane->fps_info, 0, sizeof(plane->fps_info)); 65 plane->fps_info.output = (val >> i) & 1; 66 67 i++; 68 } 69 70 return 0; 71 } 72 73 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops, 74 sti_drm_fps_get, sti_drm_fps_set, "%llu\n"); 75 76 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data) 77 { 78 struct drm_info_node *node = s->private; 79 struct drm_device *dev = node->minor->dev; 80 struct drm_plane *p; 81 82 list_for_each_entry(p, &dev->mode_config.plane_list, head) { 83 struct sti_plane *plane = to_sti_plane(p); 84 85 seq_printf(s, "%s%s\n", 86 plane->fps_info.fps_str, 87 plane->fps_info.fips_str); 88 } 89 90 return 0; 91 } 92 93 static struct drm_info_list sti_drm_dbg_list[] = { 94 {"fps_get", sti_drm_fps_dbg_show, 0}, 95 }; 96 97 static void sti_drm_dbg_init(struct drm_minor *minor) 98 { 99 drm_debugfs_create_files(sti_drm_dbg_list, 100 ARRAY_SIZE(sti_drm_dbg_list), 101 minor->debugfs_root, minor); 102 103 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root, 104 minor->dev, &sti_drm_fps_fops); 105 106 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME); 107 } 108 109 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 110 .fb_create = drm_gem_fb_create, 111 .atomic_check = drm_atomic_helper_check, 112 .atomic_commit = drm_atomic_helper_commit, 113 }; 114 115 static void sti_mode_config_init(struct drm_device *dev) 116 { 117 dev->mode_config.min_width = 0; 118 dev->mode_config.min_height = 0; 119 120 /* 121 * set max width and height as default value. 122 * this value would be used to check framebuffer size limitation 123 * at drm_mode_addfb(). 124 */ 125 dev->mode_config.max_width = STI_MAX_FB_WIDTH; 126 dev->mode_config.max_height = STI_MAX_FB_HEIGHT; 127 128 dev->mode_config.funcs = &sti_mode_config_funcs; 129 130 dev->mode_config.normalize_zpos = true; 131 } 132 133 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops); 134 135 static const struct drm_driver sti_driver = { 136 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 137 .fops = &sti_driver_fops, 138 DRM_GEM_DMA_DRIVER_OPS, 139 140 .debugfs_init = sti_drm_dbg_init, 141 142 .name = DRIVER_NAME, 143 .desc = DRIVER_DESC, 144 .date = DRIVER_DATE, 145 .major = DRIVER_MAJOR, 146 .minor = DRIVER_MINOR, 147 }; 148 149 static int sti_init(struct drm_device *ddev) 150 { 151 struct sti_private *private; 152 153 private = kzalloc(sizeof(*private), GFP_KERNEL); 154 if (!private) 155 return -ENOMEM; 156 157 ddev->dev_private = (void *)private; 158 dev_set_drvdata(ddev->dev, ddev); 159 private->drm_dev = ddev; 160 161 drm_mode_config_init(ddev); 162 163 sti_mode_config_init(ddev); 164 165 drm_kms_helper_poll_init(ddev); 166 167 return 0; 168 } 169 170 static void sti_cleanup(struct drm_device *ddev) 171 { 172 struct sti_private *private = ddev->dev_private; 173 174 drm_kms_helper_poll_fini(ddev); 175 drm_atomic_helper_shutdown(ddev); 176 drm_mode_config_cleanup(ddev); 177 component_unbind_all(ddev->dev, ddev); 178 dev_set_drvdata(ddev->dev, NULL); 179 kfree(private); 180 ddev->dev_private = NULL; 181 } 182 183 static int sti_bind(struct device *dev) 184 { 185 struct drm_device *ddev; 186 int ret; 187 188 ddev = drm_dev_alloc(&sti_driver, dev); 189 if (IS_ERR(ddev)) 190 return PTR_ERR(ddev); 191 192 ret = sti_init(ddev); 193 if (ret) 194 goto err_drm_dev_put; 195 196 ret = component_bind_all(ddev->dev, ddev); 197 if (ret) 198 goto err_cleanup; 199 200 ret = drm_dev_register(ddev, 0); 201 if (ret) 202 goto err_cleanup; 203 204 drm_mode_config_reset(ddev); 205 206 drm_fbdev_dma_setup(ddev, 32); 207 208 return 0; 209 210 err_cleanup: 211 sti_cleanup(ddev); 212 err_drm_dev_put: 213 drm_dev_put(ddev); 214 return ret; 215 } 216 217 static void sti_unbind(struct device *dev) 218 { 219 struct drm_device *ddev = dev_get_drvdata(dev); 220 221 drm_dev_unregister(ddev); 222 sti_cleanup(ddev); 223 drm_dev_put(ddev); 224 } 225 226 static const struct component_master_ops sti_ops = { 227 .bind = sti_bind, 228 .unbind = sti_unbind, 229 }; 230 231 static int sti_platform_probe(struct platform_device *pdev) 232 { 233 struct device *dev = &pdev->dev; 234 struct device_node *node = dev->of_node; 235 struct device_node *child_np; 236 struct component_match *match = NULL; 237 238 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 239 240 devm_of_platform_populate(dev); 241 242 child_np = of_get_next_available_child(node, NULL); 243 244 while (child_np) { 245 drm_of_component_match_add(dev, &match, component_compare_of, 246 child_np); 247 child_np = of_get_next_available_child(node, child_np); 248 } 249 250 return component_master_add_with_match(dev, &sti_ops, match); 251 } 252 253 static void sti_platform_remove(struct platform_device *pdev) 254 { 255 component_master_del(&pdev->dev, &sti_ops); 256 } 257 258 static void sti_platform_shutdown(struct platform_device *pdev) 259 { 260 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 261 } 262 263 static const struct of_device_id sti_dt_ids[] = { 264 { .compatible = "st,sti-display-subsystem", }, 265 { /* end node */ }, 266 }; 267 MODULE_DEVICE_TABLE(of, sti_dt_ids); 268 269 static struct platform_driver sti_platform_driver = { 270 .probe = sti_platform_probe, 271 .remove_new = sti_platform_remove, 272 .shutdown = sti_platform_shutdown, 273 .driver = { 274 .name = DRIVER_NAME, 275 .of_match_table = sti_dt_ids, 276 }, 277 }; 278 279 static struct platform_driver * const drivers[] = { 280 &sti_tvout_driver, 281 &sti_hqvdp_driver, 282 &sti_hdmi_driver, 283 &sti_hda_driver, 284 &sti_dvo_driver, 285 &sti_vtg_driver, 286 &sti_compositor_driver, 287 &sti_platform_driver, 288 }; 289 290 static int sti_drm_init(void) 291 { 292 if (drm_firmware_drivers_only()) 293 return -ENODEV; 294 295 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 296 } 297 module_init(sti_drm_init); 298 299 static void sti_drm_exit(void) 300 { 301 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 302 } 303 module_exit(sti_drm_exit); 304 305 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 306 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 307 MODULE_LICENSE("GPL"); 308