drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * RZ/G2L Display Unit DRM driver
   4  *
   5  * Copyright (C) 2023 Renesas Electronics Corporation
   6  *
   7  * Based on rcar_du_drv.c
   8  */
   9
  10 #include <linux/dma-mapping.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_client_setup.h>
  17 #include <drm/drm_drv.h>
  18 #include <drm/drm_fbdev_dma.h>
  19 #include <drm/drm_gem_dma_helper.h>
  20 #include <drm/drm_probe_helper.h>
  21
  22 #include "rzg2l_du_drv.h"
  23 #include "rzg2l_du_kms.h"
  24
  25 /* -----------------------------------------------------------------------------
  26  * Device Information
  27  */
  28
  29 static const struct rzg2l_du_device_info rzg2l_du_r9a07g043u_info = {
  30         .channels_mask = BIT(0),
  31         .routes = {
  32                 [RZG2L_DU_OUTPUT_DPAD0] = {
  33                         .possible_outputs = BIT(0),
  34                         .port = 0,
  35                 },
  36         },
  37 };
  38
  39 static const struct rzg2l_du_device_info rzg2l_du_r9a07g044_info = {
  40         .channels_mask = BIT(0),
  41         .routes = {
  42                 [RZG2L_DU_OUTPUT_DSI0] = {
  43                         .possible_outputs = BIT(0),
  44                         .port = 0,
  45                 },
  46                 [RZG2L_DU_OUTPUT_DPAD0] = {
  47                         .possible_outputs = BIT(0),
  48                         .port = 1,
  49                 }
  50         }
  51 };
  52
  53 static const struct of_device_id rzg2l_du_of_table[] = {
  54         { .compatible = "renesas,r9a07g043u-du", .data = &rzg2l_du_r9a07g043u_info },
  55         { .compatible = "renesas,r9a07g044-du", .data = &rzg2l_du_r9a07g044_info },
  56         { /* sentinel */ }
  57 };
  58
  59 MODULE_DEVICE_TABLE(of, rzg2l_du_of_table);
  60
  61 const char *rzg2l_du_output_name(enum rzg2l_du_output output)
  62 {
  63         static const char * const names[] = {
  64                 [RZG2L_DU_OUTPUT_DSI0] = "DSI0",
  65                 [RZG2L_DU_OUTPUT_DPAD0] = "DPAD0"
  66         };
  67
  68         if (output >= ARRAY_SIZE(names))
  69                 return "UNKNOWN";
  70
  71         return names[output];
  72 }
  73
  74 /* -----------------------------------------------------------------------------
  75  * DRM operations
  76  */
  77
  78 DEFINE_DRM_GEM_DMA_FOPS(rzg2l_du_fops);
  79
  80 static const struct drm_driver rzg2l_du_driver = {
  81         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  82         .dumb_create            = rzg2l_du_dumb_create,
  83         DRM_FBDEV_DMA_DRIVER_OPS,
  84         .fops                   = &rzg2l_du_fops,
  85         .name                   = "rzg2l-du",
  86         .desc                   = "Renesas RZ/G2L Display Unit",
  87         .date                   = "20230410",
  88         .major                  = 1,
  89         .minor                  = 0,
  90 };
  91
  92 /* -----------------------------------------------------------------------------
  93  * Platform driver
  94  */
  95
  96 static void rzg2l_du_remove(struct platform_device *pdev)
  97 {
  98         struct rzg2l_du_device *rcdu = platform_get_drvdata(pdev);
  99         struct drm_device *ddev = &rcdu->ddev;
 100
 101         drm_dev_unregister(ddev);
 102         drm_atomic_helper_shutdown(ddev);
 103
 104         drm_kms_helper_poll_fini(ddev);
 105 }
 106
 107 static void rzg2l_du_shutdown(struct platform_device *pdev)
 108 {
 109         struct rzg2l_du_device *rcdu = platform_get_drvdata(pdev);
 110
 111         drm_atomic_helper_shutdown(&rcdu->ddev);
 112 }
 113
 114 static int rzg2l_du_probe(struct platform_device *pdev)
 115 {
 116         struct rzg2l_du_device *rcdu;
 117         int ret;
 118
 119         if (drm_firmware_drivers_only())
 120                 return -ENODEV;
 121
 122         /* Allocate and initialize the RZ/G2L device structure. */
 123         rcdu = devm_drm_dev_alloc(&pdev->dev, &rzg2l_du_driver,
 124                                   struct rzg2l_du_device, ddev);
 125         if (IS_ERR(rcdu))
 126                 return PTR_ERR(rcdu);
 127
 128         rcdu->dev = &pdev->dev;
 129         rcdu->info = of_device_get_match_data(rcdu->dev);
 130
 131         platform_set_drvdata(pdev, rcdu);
 132
 133         /* I/O resources */
 134         rcdu->mmio = devm_platform_ioremap_resource(pdev, 0);
 135         if (IS_ERR(rcdu->mmio))
 136                 return PTR_ERR(rcdu->mmio);
 137
 138         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 139         if (ret)
 140                 return ret;
 141
 142         /* DRM/KMS objects */
 143         ret = rzg2l_du_modeset_init(rcdu);
 144         if (ret < 0) {
 145                 /*
 146                  * Don't use dev_err_probe(), as it would overwrite the probe
 147                  * deferral reason recorded in rzg2l_du_modeset_init().
 148                  */
 149                 if (ret != -EPROBE_DEFER)
 150                         dev_err(&pdev->dev,
 151                                 "failed to initialize DRM/KMS (%d)\n", ret);
 152                 goto error;
 153         }
 154
 155         /*
 156          * Register the DRM device with the core and the connectors with
 157          * sysfs.
 158          */
 159         ret = drm_dev_register(&rcdu->ddev, 0);
 160         if (ret)
 161                 goto error;
 162
 163         drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));
 164
 165         drm_client_setup(&rcdu->ddev, NULL);
 166
 167         return 0;
 168
 169 error:
 170         drm_kms_helper_poll_fini(&rcdu->ddev);
 171         return ret;
 172 }
 173
 174 static struct platform_driver rzg2l_du_platform_driver = {
 175         .probe          = rzg2l_du_probe,
 176         .remove         = rzg2l_du_remove,
 177         .shutdown       = rzg2l_du_shutdown,
 178         .driver         = {
 179                 .name   = "rzg2l-du",
 180                 .of_match_table = rzg2l_du_of_table,
 181         },
 182 };
 183
 184 module_platform_driver(rzg2l_du_platform_driver);
 185
 186 MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
 187 MODULE_DESCRIPTION("Renesas RZ/G2L Display Unit DRM Driver");
 188 MODULE_LICENSE("GPL");