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/mod_devicetable.h> |
14 | #include <linux/module.h> |
15 | #include <linux/platform_device.h> |
16 | #include <linux/pm_runtime.h> |
17 | |
18 | #include <drm/drm_aperture.h> |
19 | #include <drm/drm_atomic.h> |
20 | #include <drm/drm_atomic_helper.h> |
21 | #include <drm/drm_drv.h> |
22 | #include <drm/drm_fbdev_dma.h> |
23 | #include <drm/drm_gem_dma_helper.h> |
24 | #include <drm/drm_gem_framebuffer_helper.h> |
25 | #include <drm/drm_module.h> |
26 | #include <drm/drm_probe_helper.h> |
27 | #include <drm/drm_vblank.h> |
28 | |
29 | #include "ltdc.h" |
30 | |
31 | #define STM_MAX_FB_WIDTH 2048 |
32 | #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ |
33 | |
34 | static const struct drm_mode_config_funcs drv_mode_config_funcs = { |
35 | .fb_create = drm_gem_fb_create, |
36 | .atomic_check = drm_atomic_helper_check, |
37 | .atomic_commit = drm_atomic_helper_commit, |
38 | }; |
39 | |
40 | static int stm_gem_dma_dumb_create(struct drm_file *file, |
41 | struct drm_device *dev, |
42 | struct drm_mode_create_dumb *args) |
43 | { |
44 | unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); |
45 | |
46 | /* |
47 | * in order to optimize data transfer, pitch is aligned on |
48 | * 128 bytes, height is aligned on 4 bytes |
49 | */ |
50 | args->pitch = roundup(min_pitch, 128); |
51 | args->height = roundup(args->height, 4); |
52 | |
53 | return drm_gem_dma_dumb_create_internal(file_priv: file, drm: dev, args); |
54 | } |
55 | |
56 | DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops); |
57 | |
58 | static const struct drm_driver drv_driver = { |
59 | .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, |
60 | .name = "stm" , |
61 | .desc = "STMicroelectronics SoC DRM" , |
62 | .date = "20170330" , |
63 | .major = 1, |
64 | .minor = 0, |
65 | .patchlevel = 0, |
66 | .fops = &drv_driver_fops, |
67 | DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create), |
68 | }; |
69 | |
70 | static int drv_load(struct drm_device *ddev) |
71 | { |
72 | struct platform_device *pdev = to_platform_device(ddev->dev); |
73 | struct ltdc_device *ldev; |
74 | int ret; |
75 | |
76 | DRM_DEBUG("%s\n" , __func__); |
77 | |
78 | ldev = devm_kzalloc(dev: ddev->dev, size: sizeof(*ldev), GFP_KERNEL); |
79 | if (!ldev) |
80 | return -ENOMEM; |
81 | |
82 | ddev->dev_private = (void *)ldev; |
83 | |
84 | ret = drmm_mode_config_init(dev: ddev); |
85 | if (ret) |
86 | return ret; |
87 | |
88 | /* |
89 | * set max width and height as default value. |
90 | * this value would be used to check framebuffer size limitation |
91 | * at drm_mode_addfb(). |
92 | */ |
93 | ddev->mode_config.min_width = 0; |
94 | ddev->mode_config.min_height = 0; |
95 | ddev->mode_config.max_width = STM_MAX_FB_WIDTH; |
96 | ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; |
97 | ddev->mode_config.funcs = &drv_mode_config_funcs; |
98 | ddev->mode_config.normalize_zpos = true; |
99 | |
100 | ret = ltdc_load(ddev); |
101 | if (ret) |
102 | return ret; |
103 | |
104 | drm_mode_config_reset(dev: ddev); |
105 | drm_kms_helper_poll_init(dev: ddev); |
106 | |
107 | platform_set_drvdata(pdev, data: ddev); |
108 | |
109 | return 0; |
110 | } |
111 | |
112 | static void drv_unload(struct drm_device *ddev) |
113 | { |
114 | DRM_DEBUG("%s\n" , __func__); |
115 | |
116 | drm_kms_helper_poll_fini(dev: ddev); |
117 | drm_atomic_helper_shutdown(dev: ddev); |
118 | ltdc_unload(ddev); |
119 | } |
120 | |
121 | static __maybe_unused int drv_suspend(struct device *dev) |
122 | { |
123 | struct drm_device *ddev = dev_get_drvdata(dev); |
124 | struct ltdc_device *ldev = ddev->dev_private; |
125 | struct drm_atomic_state *state; |
126 | |
127 | WARN_ON(ldev->suspend_state); |
128 | |
129 | state = drm_atomic_helper_suspend(dev: ddev); |
130 | if (IS_ERR(ptr: state)) |
131 | return PTR_ERR(ptr: state); |
132 | |
133 | ldev->suspend_state = state; |
134 | pm_runtime_force_suspend(dev); |
135 | |
136 | return 0; |
137 | } |
138 | |
139 | static __maybe_unused int drv_resume(struct device *dev) |
140 | { |
141 | struct drm_device *ddev = dev_get_drvdata(dev); |
142 | struct ltdc_device *ldev = ddev->dev_private; |
143 | int ret; |
144 | |
145 | if (WARN_ON(!ldev->suspend_state)) |
146 | return -ENOENT; |
147 | |
148 | pm_runtime_force_resume(dev); |
149 | ret = drm_atomic_helper_resume(dev: ddev, state: ldev->suspend_state); |
150 | if (ret) |
151 | pm_runtime_force_suspend(dev); |
152 | |
153 | ldev->suspend_state = NULL; |
154 | |
155 | return ret; |
156 | } |
157 | |
158 | static __maybe_unused int drv_runtime_suspend(struct device *dev) |
159 | { |
160 | struct drm_device *ddev = dev_get_drvdata(dev); |
161 | |
162 | DRM_DEBUG_DRIVER("\n" ); |
163 | ltdc_suspend(ddev); |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | static __maybe_unused int drv_runtime_resume(struct device *dev) |
169 | { |
170 | struct drm_device *ddev = dev_get_drvdata(dev); |
171 | |
172 | DRM_DEBUG_DRIVER("\n" ); |
173 | return ltdc_resume(ddev); |
174 | } |
175 | |
176 | static const struct dev_pm_ops drv_pm_ops = { |
177 | SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) |
178 | SET_RUNTIME_PM_OPS(drv_runtime_suspend, |
179 | drv_runtime_resume, NULL) |
180 | }; |
181 | |
182 | static int stm_drm_platform_probe(struct platform_device *pdev) |
183 | { |
184 | struct device *dev = &pdev->dev; |
185 | struct drm_device *ddev; |
186 | int ret; |
187 | |
188 | DRM_DEBUG("%s\n" , __func__); |
189 | |
190 | ret = drm_aperture_remove_framebuffers(req_driver: &drv_driver); |
191 | if (ret) |
192 | return ret; |
193 | |
194 | dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); |
195 | |
196 | ddev = drm_dev_alloc(driver: &drv_driver, parent: dev); |
197 | if (IS_ERR(ptr: ddev)) |
198 | return PTR_ERR(ptr: ddev); |
199 | |
200 | ret = drv_load(ddev); |
201 | if (ret) |
202 | goto err_put; |
203 | |
204 | ret = drm_dev_register(dev: ddev, flags: 0); |
205 | if (ret) |
206 | goto err_put; |
207 | |
208 | drm_fbdev_dma_setup(dev: ddev, preferred_bpp: 16); |
209 | |
210 | return 0; |
211 | |
212 | err_put: |
213 | drm_dev_put(dev: ddev); |
214 | |
215 | return ret; |
216 | } |
217 | |
218 | static void stm_drm_platform_remove(struct platform_device *pdev) |
219 | { |
220 | struct drm_device *ddev = platform_get_drvdata(pdev); |
221 | |
222 | DRM_DEBUG("%s\n" , __func__); |
223 | |
224 | drm_dev_unregister(dev: ddev); |
225 | drv_unload(ddev); |
226 | drm_dev_put(dev: ddev); |
227 | } |
228 | |
229 | static void stm_drm_platform_shutdown(struct platform_device *pdev) |
230 | { |
231 | drm_atomic_helper_shutdown(dev: platform_get_drvdata(pdev)); |
232 | } |
233 | |
234 | static const struct of_device_id drv_dt_ids[] = { |
235 | { .compatible = "st,stm32-ltdc" }, |
236 | { /* end node */ }, |
237 | }; |
238 | MODULE_DEVICE_TABLE(of, drv_dt_ids); |
239 | |
240 | static struct platform_driver stm_drm_platform_driver = { |
241 | .probe = stm_drm_platform_probe, |
242 | .remove_new = stm_drm_platform_remove, |
243 | .shutdown = stm_drm_platform_shutdown, |
244 | .driver = { |
245 | .name = "stm32-display" , |
246 | .of_match_table = drv_dt_ids, |
247 | .pm = &drv_pm_ops, |
248 | }, |
249 | }; |
250 | |
251 | drm_module_platform_driver(stm_drm_platform_driver); |
252 | |
253 | MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>" ); |
254 | MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>" ); |
255 | MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>" ); |
256 | MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>" ); |
257 | MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver" ); |
258 | MODULE_LICENSE("GPL v2" ); |
259 | |