1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics SA 2017 4 * 5 * Authors: Philippe Cornu <philippe.cornu@st.com> 6 * Yannick Fertre <yannick.fertre@st.com> 7 * Fabien Dessenne <fabien.dessenne@st.com> 8 * Mickael Reulier <mickael.reulier@st.com> 9 */ 10 11 #include <linux/component.h> 12 #include <linux/of_platform.h> 13 14 #include <drm/drm_atomic.h> 15 #include <drm/drm_atomic_helper.h> 16 #include <drm/drm_crtc_helper.h> 17 #include <drm/drm_fb_helper.h> 18 #include <drm/drm_fb_cma_helper.h> 19 #include <drm/drm_gem_cma_helper.h> 20 #include <drm/drm_gem_framebuffer_helper.h> 21 22 #include "ltdc.h" 23 24 #define STM_MAX_FB_WIDTH 2048 25 #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ 26 27 static const struct drm_mode_config_funcs drv_mode_config_funcs = { 28 .fb_create = drm_gem_fb_create, 29 .output_poll_changed = drm_fb_helper_output_poll_changed, 30 .atomic_check = drm_atomic_helper_check, 31 .atomic_commit = drm_atomic_helper_commit, 32 }; 33 34 static int stm_gem_cma_dumb_create(struct drm_file *file, 35 struct drm_device *dev, 36 struct drm_mode_create_dumb *args) 37 { 38 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 39 40 /* 41 * in order to optimize data transfer, pitch is aligned on 42 * 128 bytes, height is aligned on 4 bytes 43 */ 44 args->pitch = roundup(min_pitch, 128); 45 args->height = roundup(args->height, 4); 46 47 return drm_gem_cma_dumb_create_internal(file, dev, args); 48 } 49 50 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops); 51 52 static struct drm_driver drv_driver = { 53 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | 54 DRIVER_ATOMIC, 55 .lastclose = drm_fb_helper_lastclose, 56 .name = "stm", 57 .desc = "STMicroelectronics SoC DRM", 58 .date = "20170330", 59 .major = 1, 60 .minor = 0, 61 .patchlevel = 0, 62 .fops = &drv_driver_fops, 63 .dumb_create = stm_gem_cma_dumb_create, 64 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 65 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 66 .gem_free_object_unlocked = drm_gem_cma_free_object, 67 .gem_vm_ops = &drm_gem_cma_vm_ops, 68 .gem_prime_export = drm_gem_prime_export, 69 .gem_prime_import = drm_gem_prime_import, 70 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 71 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 72 .gem_prime_vmap = drm_gem_cma_prime_vmap, 73 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 74 .gem_prime_mmap = drm_gem_cma_prime_mmap, 75 }; 76 77 static int drv_load(struct drm_device *ddev) 78 { 79 struct platform_device *pdev = to_platform_device(ddev->dev); 80 struct ltdc_device *ldev; 81 int ret; 82 83 DRM_DEBUG("%s\n", __func__); 84 85 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); 86 if (!ldev) 87 return -ENOMEM; 88 89 ddev->dev_private = (void *)ldev; 90 91 drm_mode_config_init(ddev); 92 93 /* 94 * set max width and height as default value. 95 * this value would be used to check framebuffer size limitation 96 * at drm_mode_addfb(). 97 */ 98 ddev->mode_config.min_width = 0; 99 ddev->mode_config.min_height = 0; 100 ddev->mode_config.max_width = STM_MAX_FB_WIDTH; 101 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; 102 ddev->mode_config.funcs = &drv_mode_config_funcs; 103 104 ret = ltdc_load(ddev); 105 if (ret) 106 goto err; 107 108 drm_mode_config_reset(ddev); 109 drm_kms_helper_poll_init(ddev); 110 111 if (ddev->mode_config.num_connector) { 112 ret = drm_fb_cma_fbdev_init(ddev, 16, 0); 113 if (ret) 114 DRM_DEBUG("Warning: fails to create fbdev\n"); 115 } 116 117 platform_set_drvdata(pdev, ddev); 118 119 return 0; 120 err: 121 drm_mode_config_cleanup(ddev); 122 return ret; 123 } 124 125 static void drv_unload(struct drm_device *ddev) 126 { 127 DRM_DEBUG("%s\n", __func__); 128 129 drm_fb_cma_fbdev_fini(ddev); 130 drm_kms_helper_poll_fini(ddev); 131 ltdc_unload(ddev); 132 drm_mode_config_cleanup(ddev); 133 } 134 135 static int stm_drm_platform_probe(struct platform_device *pdev) 136 { 137 struct device *dev = &pdev->dev; 138 struct drm_device *ddev; 139 int ret; 140 141 DRM_DEBUG("%s\n", __func__); 142 143 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 144 145 ddev = drm_dev_alloc(&drv_driver, dev); 146 if (IS_ERR(ddev)) 147 return PTR_ERR(ddev); 148 149 ret = drv_load(ddev); 150 if (ret) 151 goto err_put; 152 153 ret = drm_dev_register(ddev, 0); 154 if (ret) 155 goto err_put; 156 157 return 0; 158 159 err_put: 160 drm_dev_put(ddev); 161 162 return ret; 163 } 164 165 static int stm_drm_platform_remove(struct platform_device *pdev) 166 { 167 struct drm_device *ddev = platform_get_drvdata(pdev); 168 169 DRM_DEBUG("%s\n", __func__); 170 171 drm_dev_unregister(ddev); 172 drv_unload(ddev); 173 drm_dev_put(ddev); 174 175 return 0; 176 } 177 178 static const struct of_device_id drv_dt_ids[] = { 179 { .compatible = "st,stm32-ltdc"}, 180 { /* end node */ }, 181 }; 182 MODULE_DEVICE_TABLE(of, drv_dt_ids); 183 184 static struct platform_driver stm_drm_platform_driver = { 185 .probe = stm_drm_platform_probe, 186 .remove = stm_drm_platform_remove, 187 .driver = { 188 .name = "stm32-display", 189 .of_match_table = drv_dt_ids, 190 }, 191 }; 192 193 module_platform_driver(stm_drm_platform_driver); 194 195 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 196 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 197 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 198 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 199 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 200 MODULE_LICENSE("GPL v2"); 201