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/mod_devicetable.h> 9 #include <linux/module.h> 10 #include <linux/mutex.h> 11 #include <linux/of_graph.h> 12 #include <linux/platform_device.h> 13 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_drv.h> 16 #include <drm/drm_gem_dma_helper.h> 17 #include <drm/drm_gem_framebuffer_helper.h> 18 #include <drm/drm_of.h> 19 #include <drm/drm_probe_helper.h> 20 #include <drm/drm_vblank.h> 21 22 #include "sprd_drm.h" 23 24 #define DRIVER_NAME "sprd" 25 #define DRIVER_DESC "Spreadtrum SoCs' DRM Driver" 26 #define DRIVER_DATE "20200201" 27 #define DRIVER_MAJOR 1 28 #define DRIVER_MINOR 0 29 30 static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = { 31 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 32 }; 33 34 static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = { 35 .fb_create = drm_gem_fb_create, 36 .atomic_check = drm_atomic_helper_check, 37 .atomic_commit = drm_atomic_helper_commit, 38 }; 39 40 static void sprd_drm_mode_config_init(struct drm_device *drm) 41 { 42 drm->mode_config.min_width = 0; 43 drm->mode_config.min_height = 0; 44 drm->mode_config.max_width = 8192; 45 drm->mode_config.max_height = 8192; 46 47 drm->mode_config.funcs = &sprd_drm_mode_config_funcs; 48 drm->mode_config.helper_private = &sprd_drm_mode_config_helper; 49 } 50 51 DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops); 52 53 static struct drm_driver sprd_drm_drv = { 54 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 55 .fops = &sprd_drm_fops, 56 57 /* GEM Operations */ 58 DRM_GEM_DMA_DRIVER_OPS, 59 60 .name = DRIVER_NAME, 61 .desc = DRIVER_DESC, 62 .date = DRIVER_DATE, 63 .major = DRIVER_MAJOR, 64 .minor = DRIVER_MINOR, 65 }; 66 67 static int sprd_drm_bind(struct device *dev) 68 { 69 struct platform_device *pdev = to_platform_device(dev); 70 struct drm_device *drm; 71 struct sprd_drm *sprd; 72 int ret; 73 74 sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm); 75 if (IS_ERR(sprd)) 76 return PTR_ERR(sprd); 77 78 drm = &sprd->drm; 79 platform_set_drvdata(pdev, drm); 80 81 ret = drmm_mode_config_init(drm); 82 if (ret) 83 return ret; 84 85 sprd_drm_mode_config_init(drm); 86 87 /* bind and init sub drivers */ 88 ret = component_bind_all(drm->dev, drm); 89 if (ret) { 90 drm_err(drm, "failed to bind all component.\n"); 91 return ret; 92 } 93 94 /* vblank init */ 95 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 96 if (ret) { 97 drm_err(drm, "failed to initialize vblank.\n"); 98 goto err_unbind_all; 99 } 100 101 /* reset all the states of crtc/plane/encoder/connector */ 102 drm_mode_config_reset(drm); 103 104 /* init kms poll for handling hpd */ 105 drm_kms_helper_poll_init(drm); 106 107 ret = drm_dev_register(drm, 0); 108 if (ret < 0) 109 goto err_kms_helper_poll_fini; 110 111 return 0; 112 113 err_kms_helper_poll_fini: 114 drm_kms_helper_poll_fini(drm); 115 err_unbind_all: 116 component_unbind_all(drm->dev, drm); 117 return ret; 118 } 119 120 static void sprd_drm_unbind(struct device *dev) 121 { 122 struct drm_device *drm = dev_get_drvdata(dev); 123 124 drm_dev_unregister(drm); 125 126 drm_kms_helper_poll_fini(drm); 127 128 component_unbind_all(drm->dev, drm); 129 } 130 131 static const struct component_master_ops drm_component_ops = { 132 .bind = sprd_drm_bind, 133 .unbind = sprd_drm_unbind, 134 }; 135 136 static int sprd_drm_probe(struct platform_device *pdev) 137 { 138 return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops); 139 } 140 141 static void sprd_drm_remove(struct platform_device *pdev) 142 { 143 component_master_del(&pdev->dev, &drm_component_ops); 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_new = 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