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 kfree(private); 178 ddev->dev_private = NULL; 179 } 180 181 static int sti_bind(struct device *dev) 182 { 183 struct drm_device *ddev; 184 int ret; 185 186 ddev = drm_dev_alloc(&sti_driver, dev); 187 if (IS_ERR(ddev)) 188 return PTR_ERR(ddev); 189 190 ret = sti_init(ddev); 191 if (ret) 192 goto err_drm_dev_put; 193 194 ret = component_bind_all(ddev->dev, ddev); 195 if (ret) 196 goto err_cleanup; 197 198 ret = drm_dev_register(ddev, 0); 199 if (ret) 200 goto err_cleanup; 201 202 drm_mode_config_reset(ddev); 203 204 drm_fbdev_dma_setup(ddev, 32); 205 206 return 0; 207 208 err_cleanup: 209 sti_cleanup(ddev); 210 err_drm_dev_put: 211 drm_dev_put(ddev); 212 return ret; 213 } 214 215 static void sti_unbind(struct device *dev) 216 { 217 struct drm_device *ddev = dev_get_drvdata(dev); 218 219 drm_dev_unregister(ddev); 220 sti_cleanup(ddev); 221 drm_dev_put(ddev); 222 } 223 224 static const struct component_master_ops sti_ops = { 225 .bind = sti_bind, 226 .unbind = sti_unbind, 227 }; 228 229 static int sti_platform_probe(struct platform_device *pdev) 230 { 231 struct device *dev = &pdev->dev; 232 struct device_node *node = dev->of_node; 233 struct device_node *child_np; 234 struct component_match *match = NULL; 235 236 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 237 238 devm_of_platform_populate(dev); 239 240 child_np = of_get_next_available_child(node, NULL); 241 242 while (child_np) { 243 drm_of_component_match_add(dev, &match, component_compare_of, 244 child_np); 245 child_np = of_get_next_available_child(node, child_np); 246 } 247 248 return component_master_add_with_match(dev, &sti_ops, match); 249 } 250 251 static void sti_platform_remove(struct platform_device *pdev) 252 { 253 component_master_del(&pdev->dev, &sti_ops); 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_new = 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