1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * ZynqMP DisplayPort Subsystem Driver
4  *
5  * Copyright (C) 2017 - 2020 Xilinx, Inc.
6  *
7  * Authors:
8  * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
9  * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10  */
11 
12 #include <linux/clk.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/module.h>
15 #include <linux/of_reserved_mem.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_device.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_fb_helper.h>
23 #include <drm/drm_fourcc.h>
24 #include <drm/drm_gem_cma_helper.h>
25 #include <drm/drm_gem_framebuffer_helper.h>
26 #include <drm/drm_managed.h>
27 #include <drm/drm_mode_config.h>
28 #include <drm/drm_module.h>
29 #include <drm/drm_probe_helper.h>
30 #include <drm/drm_vblank.h>
31 
32 #include "zynqmp_disp.h"
33 #include "zynqmp_dp.h"
34 #include "zynqmp_dpsub.h"
35 
36 /* -----------------------------------------------------------------------------
37  * Dumb Buffer & Framebuffer Allocation
38  */
39 
40 static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
41 				    struct drm_device *drm,
42 				    struct drm_mode_create_dumb *args)
43 {
44 	struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
45 	unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
46 
47 	/* Enforce the alignment constraints of the DMA engine. */
48 	args->pitch = ALIGN(pitch, dpsub->dma_align);
49 
50 	return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
51 }
52 
53 static struct drm_framebuffer *
54 zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv,
55 		       const struct drm_mode_fb_cmd2 *mode_cmd)
56 {
57 	struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
58 	struct drm_mode_fb_cmd2 cmd = *mode_cmd;
59 	unsigned int i;
60 
61 	/* Enforce the alignment constraints of the DMA engine. */
62 	for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i)
63 		cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align);
64 
65 	return drm_gem_fb_create(drm, file_priv, &cmd);
66 }
67 
68 static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = {
69 	.fb_create		= zynqmp_dpsub_fb_create,
70 	.atomic_check		= drm_atomic_helper_check,
71 	.atomic_commit		= drm_atomic_helper_commit,
72 };
73 
74 /* -----------------------------------------------------------------------------
75  * DRM/KMS Driver
76  */
77 
78 DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops);
79 
80 static const struct drm_driver zynqmp_dpsub_drm_driver = {
81 	.driver_features		= DRIVER_MODESET | DRIVER_GEM |
82 					  DRIVER_ATOMIC,
83 
84 	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(zynqmp_dpsub_dumb_create),
85 
86 	.fops				= &zynqmp_dpsub_drm_fops,
87 
88 	.name				= "zynqmp-dpsub",
89 	.desc				= "Xilinx DisplayPort Subsystem Driver",
90 	.date				= "20130509",
91 	.major				= 1,
92 	.minor				= 0,
93 };
94 
95 static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
96 {
97 	struct drm_device *drm = &dpsub->drm;
98 	int ret;
99 
100 	/* Initialize mode config, vblank and the KMS poll helper. */
101 	ret = drmm_mode_config_init(drm);
102 	if (ret < 0)
103 		return ret;
104 
105 	drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs;
106 	drm->mode_config.min_width = 0;
107 	drm->mode_config.min_height = 0;
108 	drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
109 	drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
110 
111 	ret = drm_vblank_init(drm, 1);
112 	if (ret)
113 		return ret;
114 
115 	drm_kms_helper_poll_init(drm);
116 
117 	/*
118 	 * Initialize the DISP and DP components. This will creates planes,
119 	 * CRTC, encoder and connector. The DISP should be initialized first as
120 	 * the DP encoder needs the CRTC.
121 	 */
122 	ret = zynqmp_disp_drm_init(dpsub);
123 	if (ret)
124 		goto err_poll_fini;
125 
126 	ret = zynqmp_dp_drm_init(dpsub);
127 	if (ret)
128 		goto err_poll_fini;
129 
130 	/* Reset all components and register the DRM device. */
131 	drm_mode_config_reset(drm);
132 
133 	ret = drm_dev_register(drm, 0);
134 	if (ret < 0)
135 		goto err_poll_fini;
136 
137 	/* Initialize fbdev generic emulation. */
138 	drm_fbdev_generic_setup(drm, 24);
139 
140 	return 0;
141 
142 err_poll_fini:
143 	drm_kms_helper_poll_fini(drm);
144 	return ret;
145 }
146 
147 /* -----------------------------------------------------------------------------
148  * Power Management
149  */
150 
151 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
152 {
153 	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
154 
155 	return drm_mode_config_helper_suspend(&dpsub->drm);
156 }
157 
158 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
159 {
160 	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
161 
162 	return drm_mode_config_helper_resume(&dpsub->drm);
163 }
164 
165 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
166 	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
167 };
168 
169 /* -----------------------------------------------------------------------------
170  * Probe & Remove
171  */
172 
173 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
174 {
175 	int ret;
176 
177 	dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
178 	if (IS_ERR(dpsub->apb_clk))
179 		return PTR_ERR(dpsub->apb_clk);
180 
181 	ret = clk_prepare_enable(dpsub->apb_clk);
182 	if (ret) {
183 		dev_err(dpsub->dev, "failed to enable the APB clock\n");
184 		return ret;
185 	}
186 
187 	return 0;
188 }
189 
190 static int zynqmp_dpsub_probe(struct platform_device *pdev)
191 {
192 	struct zynqmp_dpsub *dpsub;
193 	int ret;
194 
195 	/* Allocate private data. */
196 	dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver,
197 				   struct zynqmp_dpsub, drm);
198 	if (IS_ERR(dpsub))
199 		return PTR_ERR(dpsub);
200 
201 	dpsub->dev = &pdev->dev;
202 	platform_set_drvdata(pdev, dpsub);
203 
204 	dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
205 
206 	/* Try the reserved memory. Proceed if there's none. */
207 	of_reserved_mem_device_init(&pdev->dev);
208 
209 	ret = zynqmp_dpsub_init_clocks(dpsub);
210 	if (ret < 0)
211 		goto err_mem;
212 
213 	pm_runtime_enable(&pdev->dev);
214 
215 	/*
216 	 * DP should be probed first so that the zynqmp_disp can set the output
217 	 * format accordingly.
218 	 */
219 	ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
220 	if (ret)
221 		goto err_pm;
222 
223 	ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
224 	if (ret)
225 		goto err_dp;
226 
227 	ret = zynqmp_dpsub_drm_init(dpsub);
228 	if (ret)
229 		goto err_disp;
230 
231 	dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
232 
233 	return 0;
234 
235 err_disp:
236 	zynqmp_disp_remove(dpsub);
237 err_dp:
238 	zynqmp_dp_remove(dpsub);
239 err_pm:
240 	pm_runtime_disable(&pdev->dev);
241 	clk_disable_unprepare(dpsub->apb_clk);
242 err_mem:
243 	of_reserved_mem_device_release(&pdev->dev);
244 	return ret;
245 }
246 
247 static int zynqmp_dpsub_remove(struct platform_device *pdev)
248 {
249 	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
250 	struct drm_device *drm = &dpsub->drm;
251 
252 	drm_dev_unregister(drm);
253 	drm_atomic_helper_shutdown(drm);
254 	drm_kms_helper_poll_fini(drm);
255 
256 	zynqmp_disp_remove(dpsub);
257 	zynqmp_dp_remove(dpsub);
258 
259 	pm_runtime_disable(&pdev->dev);
260 	clk_disable_unprepare(dpsub->apb_clk);
261 	of_reserved_mem_device_release(&pdev->dev);
262 
263 	return 0;
264 }
265 
266 static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
267 {
268 	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
269 
270 	drm_atomic_helper_shutdown(&dpsub->drm);
271 }
272 
273 static const struct of_device_id zynqmp_dpsub_of_match[] = {
274 	{ .compatible = "xlnx,zynqmp-dpsub-1.7", },
275 	{ /* end of table */ },
276 };
277 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
278 
279 static struct platform_driver zynqmp_dpsub_driver = {
280 	.probe			= zynqmp_dpsub_probe,
281 	.remove			= zynqmp_dpsub_remove,
282 	.shutdown		= zynqmp_dpsub_shutdown,
283 	.driver			= {
284 		.name		= "zynqmp-dpsub",
285 		.pm		= &zynqmp_dpsub_pm_ops,
286 		.of_match_table	= zynqmp_dpsub_of_match,
287 	},
288 };
289 
290 drm_module_platform_driver(zynqmp_dpsub_driver);
291 
292 MODULE_AUTHOR("Xilinx, Inc.");
293 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
294 MODULE_LICENSE("GPL v2");
295