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_probe_helper.h>
29 #include <drm/drm_vblank.h>
30
31 #include "zynqmp_disp.h"
32 #include "zynqmp_dp.h"
33 #include "zynqmp_dpsub.h"
34
35 /* -----------------------------------------------------------------------------
36 * Dumb Buffer & Framebuffer Allocation
37 */
38
zynqmp_dpsub_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)39 static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
40 struct drm_device *drm,
41 struct drm_mode_create_dumb *args)
42 {
43 struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
44 unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
45
46 /* Enforce the alignment constraints of the DMA engine. */
47 args->pitch = ALIGN(pitch, dpsub->dma_align);
48
49 return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
50 }
51
52 static struct drm_framebuffer *
zynqmp_dpsub_fb_create(struct drm_device * drm,struct drm_file * file_priv,const struct drm_mode_fb_cmd2 * mode_cmd)53 zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv,
54 const struct drm_mode_fb_cmd2 *mode_cmd)
55 {
56 struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
57 struct drm_mode_fb_cmd2 cmd = *mode_cmd;
58 unsigned int i;
59
60 /* Enforce the alignment constraints of the DMA engine. */
61 for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i)
62 cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align);
63
64 return drm_gem_fb_create(drm, file_priv, &cmd);
65 }
66
67 static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = {
68 .fb_create = zynqmp_dpsub_fb_create,
69 .atomic_check = drm_atomic_helper_check,
70 .atomic_commit = drm_atomic_helper_commit,
71 };
72
73 /* -----------------------------------------------------------------------------
74 * DRM/KMS Driver
75 */
76
77 DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops);
78
79 static struct drm_driver zynqmp_dpsub_drm_driver = {
80 .driver_features = DRIVER_MODESET | DRIVER_GEM |
81 DRIVER_ATOMIC,
82
83 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
84 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
85 .gem_prime_export = drm_gem_prime_export,
86 .gem_prime_import = drm_gem_prime_import,
87 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
88 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
89 .gem_prime_vmap = drm_gem_cma_prime_vmap,
90 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
91 .gem_prime_mmap = drm_gem_cma_prime_mmap,
92 .gem_free_object_unlocked = drm_gem_cma_free_object,
93 .gem_vm_ops = &drm_gem_cma_vm_ops,
94 .dumb_create = zynqmp_dpsub_dumb_create,
95 .dumb_destroy = drm_gem_dumb_destroy,
96
97 .fops = &zynqmp_dpsub_drm_fops,
98
99 .name = "zynqmp-dpsub",
100 .desc = "Xilinx DisplayPort Subsystem Driver",
101 .date = "20130509",
102 .major = 1,
103 .minor = 0,
104 };
105
zynqmp_dpsub_drm_init(struct zynqmp_dpsub * dpsub)106 static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
107 {
108 struct drm_device *drm = &dpsub->drm;
109 int ret;
110
111 /* Initialize mode config, vblank and the KMS poll helper. */
112 ret = drmm_mode_config_init(drm);
113 if (ret < 0)
114 return ret;
115
116 drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs;
117 drm->mode_config.min_width = 0;
118 drm->mode_config.min_height = 0;
119 drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
120 drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
121
122 ret = drm_vblank_init(drm, 1);
123 if (ret)
124 return ret;
125
126 drm->irq_enabled = 1;
127
128 drm_kms_helper_poll_init(drm);
129
130 /*
131 * Initialize the DISP and DP components. This will creates planes,
132 * CRTC, encoder and connector. The DISP should be initialized first as
133 * the DP encoder needs the CRTC.
134 */
135 ret = zynqmp_disp_drm_init(dpsub);
136 if (ret)
137 goto err_poll_fini;
138
139 ret = zynqmp_dp_drm_init(dpsub);
140 if (ret)
141 goto err_poll_fini;
142
143 /* Reset all components and register the DRM device. */
144 drm_mode_config_reset(drm);
145
146 ret = drm_dev_register(drm, 0);
147 if (ret < 0)
148 goto err_poll_fini;
149
150 /* Initialize fbdev generic emulation. */
151 drm_fbdev_generic_setup(drm, 24);
152
153 return 0;
154
155 err_poll_fini:
156 drm_kms_helper_poll_fini(drm);
157 return ret;
158 }
159
160 /* -----------------------------------------------------------------------------
161 * Power Management
162 */
163
zynqmp_dpsub_suspend(struct device * dev)164 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
165 {
166 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
167
168 return drm_mode_config_helper_suspend(&dpsub->drm);
169 }
170
zynqmp_dpsub_resume(struct device * dev)171 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
172 {
173 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
174
175 return drm_mode_config_helper_resume(&dpsub->drm);
176 }
177
178 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
179 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
180 };
181
182 /* -----------------------------------------------------------------------------
183 * Probe & Remove
184 */
185
zynqmp_dpsub_init_clocks(struct zynqmp_dpsub * dpsub)186 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
187 {
188 int ret;
189
190 dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
191 if (IS_ERR(dpsub->apb_clk))
192 return PTR_ERR(dpsub->apb_clk);
193
194 ret = clk_prepare_enable(dpsub->apb_clk);
195 if (ret) {
196 dev_err(dpsub->dev, "failed to enable the APB clock\n");
197 return ret;
198 }
199
200 return 0;
201 }
202
zynqmp_dpsub_probe(struct platform_device * pdev)203 static int zynqmp_dpsub_probe(struct platform_device *pdev)
204 {
205 struct zynqmp_dpsub *dpsub;
206 int ret;
207
208 /* Allocate private data. */
209 dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver,
210 struct zynqmp_dpsub, drm);
211 if (IS_ERR(dpsub))
212 return PTR_ERR(dpsub);
213
214 dpsub->dev = &pdev->dev;
215 platform_set_drvdata(pdev, dpsub);
216
217 dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
218
219 /* Try the reserved memory. Proceed if there's none. */
220 of_reserved_mem_device_init(&pdev->dev);
221
222 ret = zynqmp_dpsub_init_clocks(dpsub);
223 if (ret < 0)
224 goto err_mem;
225
226 pm_runtime_enable(&pdev->dev);
227
228 /*
229 * DP should be probed first so that the zynqmp_disp can set the output
230 * format accordingly.
231 */
232 ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
233 if (ret)
234 goto err_pm;
235
236 ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
237 if (ret)
238 goto err_dp;
239
240 ret = zynqmp_dpsub_drm_init(dpsub);
241 if (ret)
242 goto err_disp;
243
244 dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
245
246 return 0;
247
248 err_disp:
249 zynqmp_disp_remove(dpsub);
250 err_dp:
251 zynqmp_dp_remove(dpsub);
252 err_pm:
253 pm_runtime_disable(&pdev->dev);
254 clk_disable_unprepare(dpsub->apb_clk);
255 err_mem:
256 of_reserved_mem_device_release(&pdev->dev);
257 return ret;
258 }
259
zynqmp_dpsub_remove(struct platform_device * pdev)260 static int zynqmp_dpsub_remove(struct platform_device *pdev)
261 {
262 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
263 struct drm_device *drm = &dpsub->drm;
264
265 drm_dev_unregister(drm);
266 drm_atomic_helper_shutdown(drm);
267 drm_kms_helper_poll_fini(drm);
268
269 zynqmp_disp_remove(dpsub);
270 zynqmp_dp_remove(dpsub);
271
272 pm_runtime_disable(&pdev->dev);
273 clk_disable_unprepare(dpsub->apb_clk);
274 of_reserved_mem_device_release(&pdev->dev);
275
276 return 0;
277 }
278
zynqmp_dpsub_shutdown(struct platform_device * pdev)279 static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
280 {
281 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
282
283 drm_atomic_helper_shutdown(&dpsub->drm);
284 }
285
286 static const struct of_device_id zynqmp_dpsub_of_match[] = {
287 { .compatible = "xlnx,zynqmp-dpsub-1.7", },
288 { /* end of table */ },
289 };
290 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
291
292 static struct platform_driver zynqmp_dpsub_driver = {
293 .probe = zynqmp_dpsub_probe,
294 .remove = zynqmp_dpsub_remove,
295 .shutdown = zynqmp_dpsub_shutdown,
296 .driver = {
297 .name = "zynqmp-dpsub",
298 .pm = &zynqmp_dpsub_pm_ops,
299 .of_match_table = zynqmp_dpsub_of_match,
300 },
301 };
302
303 module_platform_driver(zynqmp_dpsub_driver);
304
305 MODULE_AUTHOR("Xilinx, Inc.");
306 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
307 MODULE_LICENSE("GPL v2");
308