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 const 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 sti_init(struct drm_device *ddev) 148 { 149 struct sti_private *private; 150 151 private = kzalloc(sizeof(*private), GFP_KERNEL); 152 if (!private) 153 return -ENOMEM; 154 155 ddev->dev_private = (void *)private; 156 dev_set_drvdata(ddev->dev, ddev); 157 private->drm_dev = ddev; 158 159 drm_mode_config_init(ddev); 160 161 sti_mode_config_init(ddev); 162 163 drm_kms_helper_poll_init(ddev); 164 165 return 0; 166 } 167 168 static void sti_cleanup(struct drm_device *ddev) 169 { 170 struct sti_private *private = ddev->dev_private; 171 172 drm_kms_helper_poll_fini(ddev); 173 drm_atomic_helper_shutdown(ddev); 174 drm_mode_config_cleanup(ddev); 175 component_unbind_all(ddev->dev, ddev); 176 kfree(private); 177 ddev->dev_private = NULL; 178 } 179 180 static int sti_bind(struct device *dev) 181 { 182 struct drm_device *ddev; 183 int ret; 184 185 ddev = drm_dev_alloc(&sti_driver, dev); 186 if (IS_ERR(ddev)) 187 return PTR_ERR(ddev); 188 189 ret = sti_init(ddev); 190 if (ret) 191 goto err_drm_dev_put; 192 193 ret = component_bind_all(ddev->dev, ddev); 194 if (ret) 195 goto err_cleanup; 196 197 ret = drm_dev_register(ddev, 0); 198 if (ret) 199 goto err_cleanup; 200 201 drm_mode_config_reset(ddev); 202 203 drm_fbdev_generic_setup(ddev, 32); 204 205 return 0; 206 207 err_cleanup: 208 sti_cleanup(ddev); 209 err_drm_dev_put: 210 drm_dev_put(ddev); 211 return ret; 212 } 213 214 static void sti_unbind(struct device *dev) 215 { 216 struct drm_device *ddev = dev_get_drvdata(dev); 217 218 drm_dev_unregister(ddev); 219 sti_cleanup(ddev); 220 drm_dev_put(ddev); 221 } 222 223 static const struct component_master_ops sti_ops = { 224 .bind = sti_bind, 225 .unbind = sti_unbind, 226 }; 227 228 static int sti_platform_probe(struct platform_device *pdev) 229 { 230 struct device *dev = &pdev->dev; 231 struct device_node *node = dev->of_node; 232 struct device_node *child_np; 233 struct component_match *match = NULL; 234 235 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 236 237 devm_of_platform_populate(dev); 238 239 child_np = of_get_next_available_child(node, NULL); 240 241 while (child_np) { 242 drm_of_component_match_add(dev, &match, component_compare_of, 243 child_np); 244 child_np = of_get_next_available_child(node, child_np); 245 } 246 247 return component_master_add_with_match(dev, &sti_ops, match); 248 } 249 250 static int sti_platform_remove(struct platform_device *pdev) 251 { 252 component_master_del(&pdev->dev, &sti_ops); 253 254 return 0; 255 } 256 257 static const struct of_device_id sti_dt_ids[] = { 258 { .compatible = "st,sti-display-subsystem", }, 259 { /* end node */ }, 260 }; 261 MODULE_DEVICE_TABLE(of, sti_dt_ids); 262 263 static struct platform_driver sti_platform_driver = { 264 .probe = sti_platform_probe, 265 .remove = sti_platform_remove, 266 .driver = { 267 .name = DRIVER_NAME, 268 .of_match_table = sti_dt_ids, 269 }, 270 }; 271 272 static struct platform_driver * const drivers[] = { 273 &sti_tvout_driver, 274 &sti_hqvdp_driver, 275 &sti_hdmi_driver, 276 &sti_hda_driver, 277 &sti_dvo_driver, 278 &sti_vtg_driver, 279 &sti_compositor_driver, 280 &sti_platform_driver, 281 }; 282 283 static int sti_drm_init(void) 284 { 285 if (drm_firmware_drivers_only()) 286 return -ENODEV; 287 288 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 289 } 290 module_init(sti_drm_init); 291 292 static void sti_drm_exit(void) 293 { 294 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 295 } 296 module_exit(sti_drm_exit); 297 298 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 299 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 300 MODULE_LICENSE("GPL"); 301