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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) STMicroelectronics SA 2017
4 *
5 * Authors: Philippe Cornu <philippe.cornu@st.com>
6 * Yannick Fertre <yannick.fertre@st.com>
7 * Fabien Dessenne <fabien.dessenne@st.com>
8 * Mickael Reulier <mickael.reulier@st.com>
9 */
10
11#include <linux/component.h>
12#include <linux/dma-mapping.h>
13#include <linux/module.h>
14#include <linux/of_platform.h>
15#include <linux/pm_runtime.h>
16
17#include <drm/drm_atomic.h>
18#include <drm/drm_atomic_helper.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_fb_cma_helper.h>
21#include <drm/drm_fb_helper.h>
22#include <drm/drm_gem_cma_helper.h>
23#include <drm/drm_gem_framebuffer_helper.h>
24#include <drm/drm_probe_helper.h>
25#include <drm/drm_vblank.h>
26
27#include "ltdc.h"
28
29#define STM_MAX_FB_WIDTH 2048
30#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
31
32static const struct drm_mode_config_funcs drv_mode_config_funcs = {
33 .fb_create = drm_gem_fb_create,
34 .atomic_check = drm_atomic_helper_check,
35 .atomic_commit = drm_atomic_helper_commit,
36};
37
38static int stm_gem_cma_dumb_create(struct drm_file *file,
39 struct drm_device *dev,
40 struct drm_mode_create_dumb *args)
41{
42 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
43
44 /*
45 * in order to optimize data transfer, pitch is aligned on
46 * 128 bytes, height is aligned on 4 bytes
47 */
48 args->pitch = roundup(min_pitch, 128);
49 args->height = roundup(args->height, 4);
50
51 return drm_gem_cma_dumb_create_internal(file, dev, args);
52}
53
54DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
55
56static const struct drm_driver drv_driver = {
57 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
58 .name = "stm",
59 .desc = "STMicroelectronics SoC DRM",
60 .date = "20170330",
61 .major = 1,
62 .minor = 0,
63 .patchlevel = 0,
64 .fops = &drv_driver_fops,
65 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_cma_dumb_create),
66};
67
68static int drv_load(struct drm_device *ddev)
69{
70 struct platform_device *pdev = to_platform_device(ddev->dev);
71 struct ltdc_device *ldev;
72 int ret;
73
74 DRM_DEBUG("%s\n", __func__);
75
76 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
77 if (!ldev)
78 return -ENOMEM;
79
80 ddev->dev_private = (void *)ldev;
81
82 ret = drmm_mode_config_init(ddev);
83 if (ret)
84 return ret;
85
86 /*
87 * set max width and height as default value.
88 * this value would be used to check framebuffer size limitation
89 * at drm_mode_addfb().
90 */
91 ddev->mode_config.min_width = 0;
92 ddev->mode_config.min_height = 0;
93 ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
94 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
95 ddev->mode_config.funcs = &drv_mode_config_funcs;
96
97 ret = ltdc_load(ddev);
98 if (ret)
99 return ret;
100
101 drm_mode_config_reset(ddev);
102 drm_kms_helper_poll_init(ddev);
103
104 platform_set_drvdata(pdev, ddev);
105
106 return 0;
107}
108
109static void drv_unload(struct drm_device *ddev)
110{
111 DRM_DEBUG("%s\n", __func__);
112
113 drm_kms_helper_poll_fini(ddev);
114 ltdc_unload(ddev);
115}
116
117static __maybe_unused int drv_suspend(struct device *dev)
118{
119 struct drm_device *ddev = dev_get_drvdata(dev);
120 struct ltdc_device *ldev = ddev->dev_private;
121 struct drm_atomic_state *state;
122
123 WARN_ON(ldev->suspend_state);
124
125 state = drm_atomic_helper_suspend(ddev);
126 if (IS_ERR(state))
127 return PTR_ERR(state);
128
129 ldev->suspend_state = state;
130 pm_runtime_force_suspend(dev);
131
132 return 0;
133}
134
135static __maybe_unused int drv_resume(struct device *dev)
136{
137 struct drm_device *ddev = dev_get_drvdata(dev);
138 struct ltdc_device *ldev = ddev->dev_private;
139 int ret;
140
141 if (WARN_ON(!ldev->suspend_state))
142 return -ENOENT;
143
144 pm_runtime_force_resume(dev);
145 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
146 if (ret)
147 pm_runtime_force_suspend(dev);
148
149 ldev->suspend_state = NULL;
150
151 return ret;
152}
153
154static __maybe_unused int drv_runtime_suspend(struct device *dev)
155{
156 struct drm_device *ddev = dev_get_drvdata(dev);
157
158 DRM_DEBUG_DRIVER("\n");
159 ltdc_suspend(ddev);
160
161 return 0;
162}
163
164static __maybe_unused int drv_runtime_resume(struct device *dev)
165{
166 struct drm_device *ddev = dev_get_drvdata(dev);
167
168 DRM_DEBUG_DRIVER("\n");
169 return ltdc_resume(ddev);
170}
171
172static const struct dev_pm_ops drv_pm_ops = {
173 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
174 SET_RUNTIME_PM_OPS(drv_runtime_suspend,
175 drv_runtime_resume, NULL)
176};
177
178static int stm_drm_platform_probe(struct platform_device *pdev)
179{
180 struct device *dev = &pdev->dev;
181 struct drm_device *ddev;
182 int ret;
183
184 DRM_DEBUG("%s\n", __func__);
185
186 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
187
188 ddev = drm_dev_alloc(&drv_driver, dev);
189 if (IS_ERR(ddev))
190 return PTR_ERR(ddev);
191
192 ret = drv_load(ddev);
193 if (ret)
194 goto err_put;
195
196 ret = drm_dev_register(ddev, 0);
197 if (ret)
198 goto err_put;
199
200 drm_fbdev_generic_setup(ddev, 16);
201
202 return 0;
203
204err_put:
205 drm_dev_put(ddev);
206
207 return ret;
208}
209
210static int stm_drm_platform_remove(struct platform_device *pdev)
211{
212 struct drm_device *ddev = platform_get_drvdata(pdev);
213
214 DRM_DEBUG("%s\n", __func__);
215
216 drm_dev_unregister(ddev);
217 drv_unload(ddev);
218 drm_dev_put(ddev);
219
220 return 0;
221}
222
223static const struct of_device_id drv_dt_ids[] = {
224 { .compatible = "st,stm32-ltdc"},
225 { /* end node */ },
226};
227MODULE_DEVICE_TABLE(of, drv_dt_ids);
228
229static struct platform_driver stm_drm_platform_driver = {
230 .probe = stm_drm_platform_probe,
231 .remove = stm_drm_platform_remove,
232 .driver = {
233 .name = "stm32-display",
234 .of_match_table = drv_dt_ids,
235 .pm = &drv_pm_ops,
236 },
237};
238
239module_platform_driver(stm_drm_platform_driver);
240
241MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
242MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
243MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
244MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
245MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
246MODULE_LICENSE("GPL v2");