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
rzg2l_du_output_name(enum rzg2l_du_output output)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
rzg2l_du_remove(struct platform_device * pdev)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
rzg2l_du_shutdown(struct platform_device * pdev)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
rzg2l_du_probe(struct platform_device * pdev)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");
189