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