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 .enable_vblank = ltdc_crtc_enable_vblank, 76 .disable_vblank = ltdc_crtc_disable_vblank, 77 }; 78 79 static int drv_load(struct drm_device *ddev) 80 { 81 struct platform_device *pdev = to_platform_device(ddev->dev); 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 ret = drm_fb_cma_fbdev_init(ddev, 16, 0); 115 if (ret) 116 DRM_DEBUG("Warning: fails to create fbdev\n"); 117 } 118 119 platform_set_drvdata(pdev, ddev); 120 121 return 0; 122 err: 123 drm_mode_config_cleanup(ddev); 124 return ret; 125 } 126 127 static void drv_unload(struct drm_device *ddev) 128 { 129 DRM_DEBUG("%s\n", __func__); 130 131 drm_fb_cma_fbdev_fini(ddev); 132 drm_kms_helper_poll_fini(ddev); 133 ltdc_unload(ddev); 134 drm_mode_config_cleanup(ddev); 135 } 136 137 static int stm_drm_platform_probe(struct platform_device *pdev) 138 { 139 struct device *dev = &pdev->dev; 140 struct drm_device *ddev; 141 int ret; 142 143 DRM_DEBUG("%s\n", __func__); 144 145 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 146 147 ddev = drm_dev_alloc(&drv_driver, dev); 148 if (IS_ERR(ddev)) 149 return PTR_ERR(ddev); 150 151 ret = drv_load(ddev); 152 if (ret) 153 goto err_unref; 154 155 ret = drm_dev_register(ddev, 0); 156 if (ret) 157 goto err_unref; 158 159 return 0; 160 161 err_unref: 162 drm_dev_unref(ddev); 163 164 return ret; 165 } 166 167 static int stm_drm_platform_remove(struct platform_device *pdev) 168 { 169 struct drm_device *ddev = platform_get_drvdata(pdev); 170 171 DRM_DEBUG("%s\n", __func__); 172 173 drm_dev_unregister(ddev); 174 drv_unload(ddev); 175 drm_dev_unref(ddev); 176 177 return 0; 178 } 179 180 static const struct of_device_id drv_dt_ids[] = { 181 { .compatible = "st,stm32-ltdc"}, 182 { /* end node */ }, 183 }; 184 MODULE_DEVICE_TABLE(of, drv_dt_ids); 185 186 static struct platform_driver stm_drm_platform_driver = { 187 .probe = stm_drm_platform_probe, 188 .remove = stm_drm_platform_remove, 189 .driver = { 190 .name = "stm32-display", 191 .of_match_table = drv_dt_ids, 192 }, 193 }; 194 195 module_platform_driver(stm_drm_platform_driver); 196 197 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 198 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 199 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 200 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 201 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 202 MODULE_LICENSE("GPL v2"); 203