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 .atomic_check = drm_atomic_helper_check, 30 .atomic_commit = drm_atomic_helper_commit, 31 }; 32 33 static int stm_gem_cma_dumb_create(struct drm_file *file, 34 struct drm_device *dev, 35 struct drm_mode_create_dumb *args) 36 { 37 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 38 39 /* 40 * in order to optimize data transfer, pitch is aligned on 41 * 128 bytes, height is aligned on 4 bytes 42 */ 43 args->pitch = roundup(min_pitch, 128); 44 args->height = roundup(args->height, 4); 45 46 return drm_gem_cma_dumb_create_internal(file, dev, args); 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 .name = "stm", 55 .desc = "STMicroelectronics SoC DRM", 56 .date = "20170330", 57 .major = 1, 58 .minor = 0, 59 .patchlevel = 0, 60 .fops = &drv_driver_fops, 61 .dumb_create = stm_gem_cma_dumb_create, 62 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 63 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 64 .gem_free_object_unlocked = drm_gem_cma_free_object, 65 .gem_vm_ops = &drm_gem_cma_vm_ops, 66 .gem_prime_export = drm_gem_prime_export, 67 .gem_prime_import = drm_gem_prime_import, 68 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 69 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 70 .gem_prime_vmap = drm_gem_cma_prime_vmap, 71 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 72 .gem_prime_mmap = drm_gem_cma_prime_mmap, 73 .get_scanout_position = ltdc_crtc_scanoutpos, 74 .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos, 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 platform_set_drvdata(pdev, ddev); 112 113 return 0; 114 err: 115 drm_mode_config_cleanup(ddev); 116 return ret; 117 } 118 119 static void drv_unload(struct drm_device *ddev) 120 { 121 DRM_DEBUG("%s\n", __func__); 122 123 drm_kms_helper_poll_fini(ddev); 124 ltdc_unload(ddev); 125 drm_mode_config_cleanup(ddev); 126 } 127 128 static int stm_drm_platform_probe(struct platform_device *pdev) 129 { 130 struct device *dev = &pdev->dev; 131 struct drm_device *ddev; 132 int ret; 133 134 DRM_DEBUG("%s\n", __func__); 135 136 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 137 138 ddev = drm_dev_alloc(&drv_driver, dev); 139 if (IS_ERR(ddev)) 140 return PTR_ERR(ddev); 141 142 ret = drv_load(ddev); 143 if (ret) 144 goto err_put; 145 146 ret = drm_dev_register(ddev, 0); 147 if (ret) 148 goto err_put; 149 150 drm_fbdev_generic_setup(ddev, 16); 151 152 return 0; 153 154 err_put: 155 drm_dev_put(ddev); 156 157 return ret; 158 } 159 160 static int stm_drm_platform_remove(struct platform_device *pdev) 161 { 162 struct drm_device *ddev = platform_get_drvdata(pdev); 163 164 DRM_DEBUG("%s\n", __func__); 165 166 drm_dev_unregister(ddev); 167 drv_unload(ddev); 168 drm_dev_put(ddev); 169 170 return 0; 171 } 172 173 static const struct of_device_id drv_dt_ids[] = { 174 { .compatible = "st,stm32-ltdc"}, 175 { /* end node */ }, 176 }; 177 MODULE_DEVICE_TABLE(of, drv_dt_ids); 178 179 static struct platform_driver stm_drm_platform_driver = { 180 .probe = stm_drm_platform_probe, 181 .remove = stm_drm_platform_remove, 182 .driver = { 183 .name = "stm32-display", 184 .of_match_table = drv_dt_ids, 185 }, 186 }; 187 188 module_platform_driver(stm_drm_platform_driver); 189 190 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 191 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 192 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 193 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 194 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 195 MODULE_LICENSE("GPL v2"); 196