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_fbdev_dma.h> 18 #include <drm/drm_gem_dma_helper.h> 19 #include <drm/drm_gem_framebuffer_helper.h> 20 #include <drm/drm_of.h> 21 #include <drm/drm_probe_helper.h> 22 23 #include "sti_drv.h" 24 #include "sti_plane.h" 25 26 #define DRIVER_NAME "sti" 27 #define DRIVER_DESC "STMicroelectronics SoC DRM" 28 #define DRIVER_DATE "20140601" 29 #define DRIVER_MAJOR 1 30 #define DRIVER_MINOR 0 31 32 #define STI_MAX_FB_HEIGHT 4096 33 #define STI_MAX_FB_WIDTH 4096 34 35 static int sti_drm_fps_get(void *data, u64 *val) 36 { 37 struct drm_device *drm_dev = data; 38 struct drm_plane *p; 39 unsigned int i = 0; 40 41 *val = 0; 42 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 43 struct sti_plane *plane = to_sti_plane(p); 44 45 *val |= plane->fps_info.output << i; 46 i++; 47 } 48 49 return 0; 50 } 51 52 static int sti_drm_fps_set(void *data, u64 val) 53 { 54 struct drm_device *drm_dev = data; 55 struct drm_plane *p; 56 unsigned int i = 0; 57 58 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) { 59 struct sti_plane *plane = to_sti_plane(p); 60 61 memset(&plane->fps_info, 0, sizeof(plane->fps_info)); 62 plane->fps_info.output = (val >> i) & 1; 63 64 i++; 65 } 66 67 return 0; 68 } 69 70 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops, 71 sti_drm_fps_get, sti_drm_fps_set, "%llu\n"); 72 73 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data) 74 { 75 struct drm_info_node *node = s->private; 76 struct drm_device *dev = node->minor->dev; 77 struct drm_plane *p; 78 79 list_for_each_entry(p, &dev->mode_config.plane_list, head) { 80 struct sti_plane *plane = to_sti_plane(p); 81 82 seq_printf(s, "%s%s\n", 83 plane->fps_info.fps_str, 84 plane->fps_info.fips_str); 85 } 86 87 return 0; 88 } 89 90 static struct drm_info_list sti_drm_dbg_list[] = { 91 {"fps_get", sti_drm_fps_dbg_show, 0}, 92 }; 93 94 static void sti_drm_dbg_init(struct drm_minor *minor) 95 { 96 drm_debugfs_create_files(sti_drm_dbg_list, 97 ARRAY_SIZE(sti_drm_dbg_list), 98 minor->debugfs_root, minor); 99 100 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root, 101 minor->dev, &sti_drm_fps_fops); 102 103 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME); 104 } 105 106 static const struct drm_mode_config_funcs sti_mode_config_funcs = { 107 .fb_create = drm_gem_fb_create, 108 .atomic_check = drm_atomic_helper_check, 109 .atomic_commit = drm_atomic_helper_commit, 110 }; 111 112 static void sti_mode_config_init(struct drm_device *dev) 113 { 114 dev->mode_config.min_width = 0; 115 dev->mode_config.min_height = 0; 116 117 /* 118 * set max width and height as default value. 119 * this value would be used to check framebuffer size limitation 120 * at drm_mode_addfb(). 121 */ 122 dev->mode_config.max_width = STI_MAX_FB_WIDTH; 123 dev->mode_config.max_height = STI_MAX_FB_HEIGHT; 124 125 dev->mode_config.funcs = &sti_mode_config_funcs; 126 127 dev->mode_config.normalize_zpos = true; 128 } 129 130 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops); 131 132 static const struct drm_driver sti_driver = { 133 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 134 .fops = &sti_driver_fops, 135 DRM_GEM_DMA_DRIVER_OPS, 136 137 .debugfs_init = sti_drm_dbg_init, 138 139 .name = DRIVER_NAME, 140 .desc = DRIVER_DESC, 141 .date = DRIVER_DATE, 142 .major = DRIVER_MAJOR, 143 .minor = DRIVER_MINOR, 144 }; 145 146 static int sti_init(struct drm_device *ddev) 147 { 148 struct sti_private *private; 149 150 private = kzalloc(sizeof(*private), GFP_KERNEL); 151 if (!private) 152 return -ENOMEM; 153 154 ddev->dev_private = (void *)private; 155 dev_set_drvdata(ddev->dev, ddev); 156 private->drm_dev = ddev; 157 158 drm_mode_config_init(ddev); 159 160 sti_mode_config_init(ddev); 161 162 drm_kms_helper_poll_init(ddev); 163 164 return 0; 165 } 166 167 static void sti_cleanup(struct drm_device *ddev) 168 { 169 struct sti_private *private = ddev->dev_private; 170 171 drm_kms_helper_poll_fini(ddev); 172 drm_atomic_helper_shutdown(ddev); 173 drm_mode_config_cleanup(ddev); 174 component_unbind_all(ddev->dev, ddev); 175 kfree(private); 176 ddev->dev_private = NULL; 177 } 178 179 static int sti_bind(struct device *dev) 180 { 181 struct drm_device *ddev; 182 int ret; 183 184 ddev = drm_dev_alloc(&sti_driver, dev); 185 if (IS_ERR(ddev)) 186 return PTR_ERR(ddev); 187 188 ret = sti_init(ddev); 189 if (ret) 190 goto err_drm_dev_put; 191 192 ret = component_bind_all(ddev->dev, ddev); 193 if (ret) 194 goto err_cleanup; 195 196 ret = drm_dev_register(ddev, 0); 197 if (ret) 198 goto err_cleanup; 199 200 drm_mode_config_reset(ddev); 201 202 drm_fbdev_dma_setup(ddev, 32); 203 204 return 0; 205 206 err_cleanup: 207 sti_cleanup(ddev); 208 err_drm_dev_put: 209 drm_dev_put(ddev); 210 return ret; 211 } 212 213 static void sti_unbind(struct device *dev) 214 { 215 struct drm_device *ddev = dev_get_drvdata(dev); 216 217 drm_dev_unregister(ddev); 218 sti_cleanup(ddev); 219 drm_dev_put(ddev); 220 } 221 222 static const struct component_master_ops sti_ops = { 223 .bind = sti_bind, 224 .unbind = sti_unbind, 225 }; 226 227 static int sti_platform_probe(struct platform_device *pdev) 228 { 229 struct device *dev = &pdev->dev; 230 struct device_node *node = dev->of_node; 231 struct device_node *child_np; 232 struct component_match *match = NULL; 233 234 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 235 236 devm_of_platform_populate(dev); 237 238 child_np = of_get_next_available_child(node, NULL); 239 240 while (child_np) { 241 drm_of_component_match_add(dev, &match, component_compare_of, 242 child_np); 243 child_np = of_get_next_available_child(node, child_np); 244 } 245 246 return component_master_add_with_match(dev, &sti_ops, match); 247 } 248 249 static int sti_platform_remove(struct platform_device *pdev) 250 { 251 component_master_del(&pdev->dev, &sti_ops); 252 253 return 0; 254 } 255 256 static const struct of_device_id sti_dt_ids[] = { 257 { .compatible = "st,sti-display-subsystem", }, 258 { /* end node */ }, 259 }; 260 MODULE_DEVICE_TABLE(of, sti_dt_ids); 261 262 static struct platform_driver sti_platform_driver = { 263 .probe = sti_platform_probe, 264 .remove = sti_platform_remove, 265 .driver = { 266 .name = DRIVER_NAME, 267 .of_match_table = sti_dt_ids, 268 }, 269 }; 270 271 static struct platform_driver * const drivers[] = { 272 &sti_tvout_driver, 273 &sti_hqvdp_driver, 274 &sti_hdmi_driver, 275 &sti_hda_driver, 276 &sti_dvo_driver, 277 &sti_vtg_driver, 278 &sti_compositor_driver, 279 &sti_platform_driver, 280 }; 281 282 static int sti_drm_init(void) 283 { 284 if (drm_firmware_drivers_only()) 285 return -ENODEV; 286 287 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 288 } 289 module_init(sti_drm_init); 290 291 static void sti_drm_exit(void) 292 { 293 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 294 } 295 module_exit(sti_drm_exit); 296 297 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 298 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 299 MODULE_LICENSE("GPL"); 300