1 /* 2 * Copyright (C) STMicroelectronics SA 2017 3 * 4 * Authors: Philippe Cornu <philippe.cornu@st.com> 5 * Yannick Fertre <yannick.fertre@st.com> 6 * Fabien Dessenne <fabien.dessenne@st.com> 7 * Mickael Reulier <mickael.reulier@st.com> 8 * 9 * License terms: GNU General Public License (GPL), version 2 10 */ 11 12 #include <linux/component.h> 13 #include <linux/of_platform.h> 14 15 #include <drm/drm_atomic.h> 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_fb_cma_helper.h> 19 #include <drm/drm_gem_cma_helper.h> 20 21 #include "ltdc.h" 22 23 #define STM_MAX_FB_WIDTH 2048 24 #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ 25 26 static void drv_output_poll_changed(struct drm_device *ddev) 27 { 28 struct ltdc_device *ldev = ddev->dev_private; 29 30 drm_fbdev_cma_hotplug_event(ldev->fbdev); 31 } 32 33 static const struct drm_mode_config_funcs drv_mode_config_funcs = { 34 .fb_create = drm_fb_cma_create, 35 .output_poll_changed = drv_output_poll_changed, 36 .atomic_check = drm_atomic_helper_check, 37 .atomic_commit = drm_atomic_helper_commit, 38 }; 39 40 static void drv_lastclose(struct drm_device *ddev) 41 { 42 struct ltdc_device *ldev = ddev->dev_private; 43 44 DRM_DEBUG("%s\n", __func__); 45 46 drm_fbdev_cma_restore_mode(ldev->fbdev); 47 } 48 49 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops); 50 51 static struct drm_driver drv_driver = { 52 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | 53 DRIVER_ATOMIC, 54 .lastclose = drv_lastclose, 55 .name = "stm", 56 .desc = "STMicroelectronics SoC DRM", 57 .date = "20170330", 58 .major = 1, 59 .minor = 0, 60 .patchlevel = 0, 61 .fops = &drv_driver_fops, 62 .dumb_create = drm_gem_cma_dumb_create, 63 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 64 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 65 .gem_free_object_unlocked = drm_gem_cma_free_object, 66 .gem_vm_ops = &drm_gem_cma_vm_ops, 67 .gem_prime_export = drm_gem_prime_export, 68 .gem_prime_import = drm_gem_prime_import, 69 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 70 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 71 .gem_prime_vmap = drm_gem_cma_prime_vmap, 72 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 73 .gem_prime_mmap = drm_gem_cma_prime_mmap, 74 .enable_vblank = ltdc_crtc_enable_vblank, 75 .disable_vblank = ltdc_crtc_disable_vblank, 76 }; 77 78 static int drv_load(struct drm_device *ddev) 79 { 80 struct platform_device *pdev = to_platform_device(ddev->dev); 81 struct drm_fbdev_cma *fbdev; 82 struct ltdc_device *ldev; 83 int ret; 84 85 DRM_DEBUG("%s\n", __func__); 86 87 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); 88 if (!ldev) 89 return -ENOMEM; 90 91 ddev->dev_private = (void *)ldev; 92 93 drm_mode_config_init(ddev); 94 95 /* 96 * set max width and height as default value. 97 * this value would be used to check framebuffer size limitation 98 * at drm_mode_addfb(). 99 */ 100 ddev->mode_config.min_width = 0; 101 ddev->mode_config.min_height = 0; 102 ddev->mode_config.max_width = STM_MAX_FB_WIDTH; 103 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; 104 ddev->mode_config.funcs = &drv_mode_config_funcs; 105 106 ret = ltdc_load(ddev); 107 if (ret) 108 goto err; 109 110 drm_mode_config_reset(ddev); 111 drm_kms_helper_poll_init(ddev); 112 113 if (ddev->mode_config.num_connector) { 114 ldev = ddev->dev_private; 115 fbdev = drm_fbdev_cma_init(ddev, 16, 116 ddev->mode_config.num_connector); 117 if (IS_ERR(fbdev)) { 118 DRM_DEBUG("Warning: fails to create fbdev\n"); 119 fbdev = NULL; 120 } 121 ldev->fbdev = fbdev; 122 } 123 124 platform_set_drvdata(pdev, ddev); 125 126 return 0; 127 err: 128 drm_mode_config_cleanup(ddev); 129 return ret; 130 } 131 132 static void drv_unload(struct drm_device *ddev) 133 { 134 struct ltdc_device *ldev = ddev->dev_private; 135 136 DRM_DEBUG("%s\n", __func__); 137 138 if (ldev->fbdev) { 139 drm_fbdev_cma_fini(ldev->fbdev); 140 ldev->fbdev = NULL; 141 } 142 drm_kms_helper_poll_fini(ddev); 143 ltdc_unload(ddev); 144 drm_mode_config_cleanup(ddev); 145 } 146 147 static int stm_drm_platform_probe(struct platform_device *pdev) 148 { 149 struct device *dev = &pdev->dev; 150 struct drm_device *ddev; 151 int ret; 152 153 DRM_DEBUG("%s\n", __func__); 154 155 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 156 157 ddev = drm_dev_alloc(&drv_driver, dev); 158 if (IS_ERR(ddev)) 159 return PTR_ERR(ddev); 160 161 ret = drv_load(ddev); 162 if (ret) 163 goto err_unref; 164 165 ret = drm_dev_register(ddev, 0); 166 if (ret) 167 goto err_unref; 168 169 return 0; 170 171 err_unref: 172 drm_dev_unref(ddev); 173 174 return ret; 175 } 176 177 static int stm_drm_platform_remove(struct platform_device *pdev) 178 { 179 struct drm_device *ddev = platform_get_drvdata(pdev); 180 181 DRM_DEBUG("%s\n", __func__); 182 183 drm_dev_unregister(ddev); 184 drv_unload(ddev); 185 drm_dev_unref(ddev); 186 187 return 0; 188 } 189 190 static const struct of_device_id drv_dt_ids[] = { 191 { .compatible = "st,stm32-ltdc"}, 192 { /* end node */ }, 193 }; 194 MODULE_DEVICE_TABLE(of, drv_dt_ids); 195 196 static struct platform_driver stm_drm_platform_driver = { 197 .probe = stm_drm_platform_probe, 198 .remove = stm_drm_platform_remove, 199 .driver = { 200 .name = "stm32-display", 201 .of_match_table = drv_dt_ids, 202 }, 203 }; 204 205 module_platform_driver(stm_drm_platform_driver); 206 207 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 208 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 209 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 210 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 211 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 212 MODULE_LICENSE("GPL v2"); 213