1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 Unisoc Inc. 4 */ 5 6 #include <linux/component.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/module.h> 9 #include <linux/mutex.h> 10 #include <linux/of_graph.h> 11 #include <linux/of_platform.h> 12 13 #include <drm/drm_atomic_helper.h> 14 #include <drm/drm_drv.h> 15 #include <drm/drm_gem_dma_helper.h> 16 #include <drm/drm_gem_framebuffer_helper.h> 17 #include <drm/drm_of.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/drm_vblank.h> 20 21 #include "sprd_drm.h" 22 23 #define DRIVER_NAME "sprd" 24 #define DRIVER_DESC "Spreadtrum SoCs' DRM Driver" 25 #define DRIVER_DATE "20200201" 26 #define DRIVER_MAJOR 1 27 #define DRIVER_MINOR 0 28 29 static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = { 30 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 31 }; 32 33 static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = { 34 .fb_create = drm_gem_fb_create, 35 .atomic_check = drm_atomic_helper_check, 36 .atomic_commit = drm_atomic_helper_commit, 37 }; 38 39 static void sprd_drm_mode_config_init(struct drm_device *drm) 40 { 41 drm->mode_config.min_width = 0; 42 drm->mode_config.min_height = 0; 43 drm->mode_config.max_width = 8192; 44 drm->mode_config.max_height = 8192; 45 46 drm->mode_config.funcs = &sprd_drm_mode_config_funcs; 47 drm->mode_config.helper_private = &sprd_drm_mode_config_helper; 48 } 49 50 DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops); 51 52 static struct drm_driver sprd_drm_drv = { 53 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 54 .fops = &sprd_drm_fops, 55 56 /* GEM Operations */ 57 DRM_GEM_DMA_DRIVER_OPS, 58 59 .name = DRIVER_NAME, 60 .desc = DRIVER_DESC, 61 .date = DRIVER_DATE, 62 .major = DRIVER_MAJOR, 63 .minor = DRIVER_MINOR, 64 }; 65 66 static int sprd_drm_bind(struct device *dev) 67 { 68 struct platform_device *pdev = to_platform_device(dev); 69 struct drm_device *drm; 70 struct sprd_drm *sprd; 71 int ret; 72 73 sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm); 74 if (IS_ERR(sprd)) 75 return PTR_ERR(sprd); 76 77 drm = &sprd->drm; 78 platform_set_drvdata(pdev, drm); 79 80 ret = drmm_mode_config_init(drm); 81 if (ret) 82 return ret; 83 84 sprd_drm_mode_config_init(drm); 85 86 /* bind and init sub drivers */ 87 ret = component_bind_all(drm->dev, drm); 88 if (ret) { 89 drm_err(drm, "failed to bind all component.\n"); 90 return ret; 91 } 92 93 /* vblank init */ 94 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 95 if (ret) { 96 drm_err(drm, "failed to initialize vblank.\n"); 97 goto err_unbind_all; 98 } 99 100 /* reset all the states of crtc/plane/encoder/connector */ 101 drm_mode_config_reset(drm); 102 103 /* init kms poll for handling hpd */ 104 drm_kms_helper_poll_init(drm); 105 106 ret = drm_dev_register(drm, 0); 107 if (ret < 0) 108 goto err_kms_helper_poll_fini; 109 110 return 0; 111 112 err_kms_helper_poll_fini: 113 drm_kms_helper_poll_fini(drm); 114 err_unbind_all: 115 component_unbind_all(drm->dev, drm); 116 return ret; 117 } 118 119 static void sprd_drm_unbind(struct device *dev) 120 { 121 struct drm_device *drm = dev_get_drvdata(dev); 122 123 drm_dev_unregister(drm); 124 125 drm_kms_helper_poll_fini(drm); 126 127 component_unbind_all(drm->dev, drm); 128 } 129 130 static const struct component_master_ops drm_component_ops = { 131 .bind = sprd_drm_bind, 132 .unbind = sprd_drm_unbind, 133 }; 134 135 static int sprd_drm_probe(struct platform_device *pdev) 136 { 137 return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops); 138 } 139 140 static int sprd_drm_remove(struct platform_device *pdev) 141 { 142 component_master_del(&pdev->dev, &drm_component_ops); 143 return 0; 144 } 145 146 static void sprd_drm_shutdown(struct platform_device *pdev) 147 { 148 struct drm_device *drm = platform_get_drvdata(pdev); 149 150 if (!drm) { 151 dev_warn(&pdev->dev, "drm device is not available, no shutdown\n"); 152 return; 153 } 154 155 drm_atomic_helper_shutdown(drm); 156 } 157 158 static const struct of_device_id drm_match_table[] = { 159 { .compatible = "sprd,display-subsystem", }, 160 { /* sentinel */ }, 161 }; 162 MODULE_DEVICE_TABLE(of, drm_match_table); 163 164 static struct platform_driver sprd_drm_driver = { 165 .probe = sprd_drm_probe, 166 .remove = sprd_drm_remove, 167 .shutdown = sprd_drm_shutdown, 168 .driver = { 169 .name = "sprd-drm-drv", 170 .of_match_table = drm_match_table, 171 }, 172 }; 173 174 static struct platform_driver *sprd_drm_drivers[] = { 175 &sprd_drm_driver, 176 &sprd_dpu_driver, 177 &sprd_dsi_driver, 178 }; 179 180 static int __init sprd_drm_init(void) 181 { 182 if (drm_firmware_drivers_only()) 183 return -ENODEV; 184 185 return platform_register_drivers(sprd_drm_drivers, 186 ARRAY_SIZE(sprd_drm_drivers)); 187 } 188 189 static void __exit sprd_drm_exit(void) 190 { 191 platform_unregister_drivers(sprd_drm_drivers, 192 ARRAY_SIZE(sprd_drm_drivers)); 193 } 194 195 module_init(sprd_drm_init); 196 module_exit(sprd_drm_exit); 197 198 MODULE_AUTHOR("Leon He <leon.he@unisoc.com>"); 199 MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>"); 200 MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver"); 201 MODULE_LICENSE("GPL v2"); 202