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/dma-mapping.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/of_platform.h> 12 13 #include <drm/drm_atomic.h> 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_debugfs.h> 16 #include <drm/drm_drv.h> 17 #include <drm/drm_fb_cma_helper.h> 18 #include <drm/drm_fb_helper.h> 19 #include <drm/drm_gem_cma_helper.h> 20 #include <drm/drm_gem_framebuffer_helper.h> 21 #include <drm/drm_of.h> 22 #include <drm/drm_probe_helper.h> 23 24 #include "sti_drv.h" 25 #include "sti_plane.h" 26 27 #define DRIVER_NAME "sti" 28 #define DRIVER_DESC "STMicroelectronics SoC DRM" 29 #define DRIVER_DATE "20140601" 30 #define DRIVER_MAJOR 1 31 #define DRIVER_MINOR 0 32 33 #define STI_MAX_FB_HEIGHT 4096 34 #define STI_MAX_FB_WIDTH 4096 35 36 static int sti_drm_fps_get(void *data, u64 *val) 37 { 38 struct drm_device *drm_dev = data; 39 struct drm_plane *p; 40 unsigned int i = 0; 41 42 *val = 0; 43 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 44 struct sti_plane *plane = to_sti_plane(p); 45 46 *val |= plane->fps_info.output << i; 47 i++; 48 } 49 50 return 0; 51 } 52 53 static int sti_drm_fps_set(void *data, u64 val) 54 { 55 struct drm_device *drm_dev = data; 56 struct drm_plane *p; 57 unsigned int i = 0; 58 59 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 60 struct sti_plane *plane = to_sti_plane(p); 61 62 memset(&plane->fps_info, 0, sizeof(plane->fps_info)); 63 plane->fps_info.output = (val >> i) & 1; 64 65 i++; 66 } 67 68 return 0; 69 } 70 71 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops, 72 sti_drm_fps_get, sti_drm_fps_set, "%llu\n"); 73 74 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data) 75 { 76 struct drm_info_node *node = s->private; 77 struct drm_device *dev = node->minor->dev; 78 struct drm_plane *p; 79 80 list_for_each_entry(p, &dev->mode_config.plane_list, head) { 81 struct sti_plane *plane = to_sti_plane(p); 82 83 seq_printf(s, "%s%s\n", 84 plane->fps_info.fps_str, 85 plane->fps_info.fips_str); 86 } 87 88 return 0; 89 } 90 91 static struct drm_info_list sti_drm_dbg_list[] = { 92 {"fps_get", sti_drm_fps_dbg_show, 0}, 93 }; 94 95 static void sti_drm_dbg_init(struct drm_minor *minor) 96 { 97 drm_debugfs_create_files(sti_drm_dbg_list, 98 ARRAY_SIZE(sti_drm_dbg_list), 99 minor->debugfs_root, minor); 100 101 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root, 102 minor->dev, &sti_drm_fps_fops); 103 104 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME); 105 } 106 107 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 108 .fb_create = drm_gem_fb_create, 109 .atomic_check = drm_atomic_helper_check, 110 .atomic_commit = drm_atomic_helper_commit, 111 }; 112 113 static void sti_mode_config_init(struct drm_device *dev) 114 { 115 dev->mode_config.min_width = 0; 116 dev->mode_config.min_height = 0; 117 118 /* 119 * set max width and height as default value. 120 * this value would be used to check framebuffer size limitation 121 * at drm_mode_addfb(). 122 */ 123 dev->mode_config.max_width = STI_MAX_FB_WIDTH; 124 dev->mode_config.max_height = STI_MAX_FB_HEIGHT; 125 126 dev->mode_config.funcs = &sti_mode_config_funcs; 127 128 dev->mode_config.normalize_zpos = true; 129 } 130 131 DEFINE_DRM_GEM_CMA_FOPS(sti_driver_fops); 132 133 static struct drm_driver sti_driver = { 134 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 135 .fops = &sti_driver_fops, 136 DRM_GEM_CMA_DRIVER_OPS, 137 138 .debugfs_init = sti_drm_dbg_init, 139 140 .name = DRIVER_NAME, 141 .desc = DRIVER_DESC, 142 .date = DRIVER_DATE, 143 .major = DRIVER_MAJOR, 144 .minor = DRIVER_MINOR, 145 }; 146 147 static int compare_of(struct device *dev, void *data) 148 { 149 return dev->of_node == data; 150 } 151 152 static int sti_init(struct drm_device *ddev) 153 { 154 struct sti_private *private; 155 156 private = kzalloc(sizeof(*private), GFP_KERNEL); 157 if (!private) 158 return -ENOMEM; 159 160 ddev->dev_private = (void *)private; 161 dev_set_drvdata(ddev->dev, ddev); 162 private->drm_dev = ddev; 163 164 drm_mode_config_init(ddev); 165 166 sti_mode_config_init(ddev); 167 168 drm_kms_helper_poll_init(ddev); 169 170 return 0; 171 } 172 173 static void sti_cleanup(struct drm_device *ddev) 174 { 175 struct sti_private *private = ddev->dev_private; 176 177 drm_kms_helper_poll_fini(ddev); 178 drm_atomic_helper_shutdown(ddev); 179 drm_mode_config_cleanup(ddev); 180 component_unbind_all(ddev->dev, ddev); 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_fbdev_generic_setup(ddev, 32); 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, 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 int sti_platform_remove(struct platform_device *pdev) 256 { 257 component_master_del(&pdev->dev, &sti_ops); 258 259 return 0; 260 } 261 262 static const struct of_device_id sti_dt_ids[] = { 263 { .compatible = "st,sti-display-subsystem", }, 264 { /* end node */ }, 265 }; 266 MODULE_DEVICE_TABLE(of, sti_dt_ids); 267 268 static struct platform_driver sti_platform_driver = { 269 .probe = sti_platform_probe, 270 .remove = sti_platform_remove, 271 .driver = { 272 .name = DRIVER_NAME, 273 .of_match_table = sti_dt_ids, 274 }, 275 }; 276 277 static struct platform_driver * const drivers[] = { 278 &sti_tvout_driver, 279 &sti_hqvdp_driver, 280 &sti_hdmi_driver, 281 &sti_hda_driver, 282 &sti_dvo_driver, 283 &sti_vtg_driver, 284 &sti_compositor_driver, 285 &sti_platform_driver, 286 }; 287 288 static int sti_drm_init(void) 289 { 290 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 291 } 292 module_init(sti_drm_init); 293 294 static void sti_drm_exit(void) 295 { 296 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 297 } 298 module_exit(sti_drm_exit); 299 300 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 301 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 302 MODULE_LICENSE("GPL"); 303