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
 29static 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
 39static 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
 53static 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
 59MODULE_DEVICE_TABLE(of, rzg2l_du_of_table);
 60
 61const 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
 78DEFINE_DRM_GEM_DMA_FOPS(rzg2l_du_fops);
 79
 80static 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
 96static 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
107static 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
114static 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
169error:
170	drm_kms_helper_poll_fini(&rcdu->ddev);
171	return ret;
172}
173
174static 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
184module_platform_driver(rzg2l_du_platform_driver);
185
186MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
187MODULE_DESCRIPTION("Renesas RZ/G2L Display Unit DRM Driver");
188MODULE_LICENSE("GPL");