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.h> 12 #include <linux/of_platform.h> 13 #include <linux/platform_device.h> 14 15 #include <drm/drm_atomic.h> 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_debugfs.h> 18 #include <drm/drm_drv.h> 19 #include <drm/drm_fbdev_dma.h> 20 #include <drm/drm_gem_dma_helper.h> 21 #include <drm/drm_gem_framebuffer_helper.h> 22 #include <drm/drm_of.h> 23 #include <drm/drm_probe_helper.h> 24 25 #include "sti_drv.h" 26 #include "sti_plane.h" 27 28 #define DRIVER_NAME "sti" 29 #define DRIVER_DESC "STMicroelectronics SoC DRM" 30 #define DRIVER_DATE "20140601" 31 #define DRIVER_MAJOR 1 32 #define DRIVER_MINOR 0 33 34 #define STI_MAX_FB_HEIGHT 4096 35 #define STI_MAX_FB_WIDTH 4096 36 37 static int sti_drm_fps_get(void *data, u64 *val) 38 { 39 struct drm_device *drm_dev = data; 40 struct drm_plane *p; 41 unsigned int i = 0; 42 43 *val = 0; 44 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 45 struct sti_plane *plane = to_sti_plane(p); 46 47 *val |= plane->fps_info.output << i; 48 i++; 49 } 50 51 return 0; 52 } 53 54 static int sti_drm_fps_set(void *data, u64 val) 55 { 56 struct drm_device *drm_dev = data; 57 struct drm_plane *p; 58 unsigned int i = 0; 59 60 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 61 struct sti_plane *plane = to_sti_plane(p); 62 63 memset(&plane->fps_info, 0, sizeof(plane->fps_info)); 64 plane->fps_info.output = (val >> i) & 1; 65 66 i++; 67 } 68 69 return 0; 70 } 71 72 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops, 73 sti_drm_fps_get, sti_drm_fps_set, "%llu\n"); 74 75 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data) 76 { 77 struct drm_info_node *node = s->private; 78 struct drm_device *dev = node->minor->dev; 79 struct drm_plane *p; 80 81 list_for_each_entry(p, &dev->mode_config.plane_list, head) { 82 struct sti_plane *plane = to_sti_plane(p); 83 84 seq_printf(s, "%s%s\n", 85 plane->fps_info.fps_str, 86 plane->fps_info.fips_str); 87 } 88 89 return 0; 90 } 91 92 static struct drm_info_list sti_drm_dbg_list[] = { 93 {"fps_get", sti_drm_fps_dbg_show, 0}, 94 }; 95 96 static void sti_drm_dbg_init(struct drm_minor *minor) 97 { 98 drm_debugfs_create_files(sti_drm_dbg_list, 99 ARRAY_SIZE(sti_drm_dbg_list), 100 minor->debugfs_root, minor); 101 102 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root, 103 minor->dev, &sti_drm_fps_fops); 104 105 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME); 106 } 107 108 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 109 .fb_create = drm_gem_fb_create, 110 .atomic_check = drm_atomic_helper_check, 111 .atomic_commit = drm_atomic_helper_commit, 112 }; 113 114 static void sti_mode_config_init(struct drm_device *dev) 115 { 116 dev->mode_config.min_width = 0; 117 dev->mode_config.min_height = 0; 118 119 /* 120 * set max width and height as default value. 121 * this value would be used to check framebuffer size limitation 122 * at drm_mode_addfb(). 123 */ 124 dev->mode_config.max_width = STI_MAX_FB_WIDTH; 125 dev->mode_config.max_height = STI_MAX_FB_HEIGHT; 126 127 dev->mode_config.funcs = &sti_mode_config_funcs; 128 129 dev->mode_config.normalize_zpos = true; 130 } 131 132 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops); 133 134 static const struct drm_driver sti_driver = { 135 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 136 .fops = &sti_driver_fops, 137 DRM_GEM_DMA_DRIVER_OPS, 138 139 .debugfs_init = sti_drm_dbg_init, 140 141 .name = DRIVER_NAME, 142 .desc = DRIVER_DESC, 143 .date = DRIVER_DATE, 144 .major = DRIVER_MAJOR, 145 .minor = DRIVER_MINOR, 146 }; 147 148 static int sti_init(struct drm_device *ddev) 149 { 150 struct sti_private *private; 151 152 private = kzalloc(sizeof(*private), GFP_KERNEL); 153 if (!private) 154 return -ENOMEM; 155 156 ddev->dev_private = (void *)private; 157 dev_set_drvdata(ddev->dev, ddev); 158 private->drm_dev = ddev; 159 160 drm_mode_config_init(ddev); 161 162 sti_mode_config_init(ddev); 163 164 drm_kms_helper_poll_init(ddev); 165 166 return 0; 167 } 168 169 static void sti_cleanup(struct drm_device *ddev) 170 { 171 struct sti_private *private = ddev->dev_private; 172 173 drm_kms_helper_poll_fini(ddev); 174 drm_atomic_helper_shutdown(ddev); 175 drm_mode_config_cleanup(ddev); 176 component_unbind_all(ddev->dev, ddev); 177 dev_set_drvdata(ddev->dev, NULL); 178 kfree(private); 179 ddev->dev_private = NULL; 180 } 181 182 static int sti_bind(struct device *dev) 183 { 184 struct drm_device *ddev; 185 int ret; 186 187 ddev = drm_dev_alloc(&sti_driver, dev); 188 if (IS_ERR(ddev)) 189 return PTR_ERR(ddev); 190 191 ret = sti_init(ddev); 192 if (ret) 193 goto err_drm_dev_put; 194 195 ret = component_bind_all(ddev->dev, ddev); 196 if (ret) 197 goto err_cleanup; 198 199 ret = drm_dev_register(ddev, 0); 200 if (ret) 201 goto err_cleanup; 202 203 drm_mode_config_reset(ddev); 204 205 drm_fbdev_dma_setup(ddev, 32); 206 207 return 0; 208 209 err_cleanup: 210 sti_cleanup(ddev); 211 err_drm_dev_put: 212 drm_dev_put(ddev); 213 return ret; 214 } 215 216 static void sti_unbind(struct device *dev) 217 { 218 struct drm_device *ddev = dev_get_drvdata(dev); 219 220 drm_dev_unregister(ddev); 221 sti_cleanup(ddev); 222 drm_dev_put(ddev); 223 } 224 225 static const struct component_master_ops sti_ops = { 226 .bind = sti_bind, 227 .unbind = sti_unbind, 228 }; 229 230 static int sti_platform_probe(struct platform_device *pdev) 231 { 232 struct device *dev = &pdev->dev; 233 struct device_node *node = dev->of_node; 234 struct device_node *child_np; 235 struct component_match *match = NULL; 236 237 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 238 239 devm_of_platform_populate(dev); 240 241 child_np = of_get_next_available_child(node, NULL); 242 243 while (child_np) { 244 drm_of_component_match_add(dev, &match, component_compare_of, 245 child_np); 246 child_np = of_get_next_available_child(node, child_np); 247 } 248 249 return component_master_add_with_match(dev, &sti_ops, match); 250 } 251 252 static void sti_platform_remove(struct platform_device *pdev) 253 { 254 component_master_del(&pdev->dev, &sti_ops); 255 } 256 257 static void sti_platform_shutdown(struct platform_device *pdev) 258 { 259 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 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_new = sti_platform_remove, 271 .shutdown = sti_platform_shutdown, 272 .driver = { 273 .name = DRIVER_NAME, 274 .of_match_table = sti_dt_ids, 275 }, 276 }; 277 278 static struct platform_driver * const drivers[] = { 279 &sti_tvout_driver, 280 &sti_hqvdp_driver, 281 &sti_hdmi_driver, 282 &sti_hda_driver, 283 &sti_dvo_driver, 284 &sti_vtg_driver, 285 &sti_compositor_driver, 286 &sti_platform_driver, 287 }; 288 289 static int sti_drm_init(void) 290 { 291 if (drm_firmware_drivers_only()) 292 return -ENODEV; 293 294 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 295 } 296 module_init(sti_drm_init); 297 298 static void sti_drm_exit(void) 299 { 300 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 301 } 302 module_exit(sti_drm_exit); 303 304 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 305 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 306 MODULE_LICENSE("GPL"); 307