tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) STMicroelectronics SA 2017
3 *
4 * Authors: Philippe Cornu <philippe.cornu@st.com>
5 * Yannick Fertre <yannick.fertre@st.com>
6 * Fabien Dessenne <fabien.dessenne@st.com>
7 * Mickael Reulier <mickael.reulier@st.com>
8 *
9 * License terms: GNU General Public License (GPL), version 2
10 */
11
12#include <linux/component.h>
13#include <linux/of_platform.h>
14
15#include <drm/drm_atomic.h>
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_crtc_helper.h>
18#include <drm/drm_fb_cma_helper.h>
19#include <drm/drm_gem_cma_helper.h>
20
21#include "ltdc.h"
22
23#define DRIVER_NAME "stm"
24#define DRIVER_DESC "STMicroelectronics SoC DRM"
25#define DRIVER_DATE "20170330"
26#define DRIVER_MAJOR 1
27#define DRIVER_MINOR 0
28#define DRIVER_PATCH_LEVEL 0
29
30#define STM_MAX_FB_WIDTH 2048
31#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
32
33static void drv_output_poll_changed(struct drm_device *ddev)
34{
35 struct ltdc_device *ldev = ddev->dev_private;
36
37 drm_fbdev_cma_hotplug_event(ldev->fbdev);
38}
39
40static const struct drm_mode_config_funcs drv_mode_config_funcs = {
41 .fb_create = drm_fb_cma_create,
42 .output_poll_changed = drv_output_poll_changed,
43 .atomic_check = drm_atomic_helper_check,
44 .atomic_commit = drm_atomic_helper_commit,
45};
46
47static void drv_lastclose(struct drm_device *ddev)
48{
49 struct ltdc_device *ldev = ddev->dev_private;
50
51 DRM_DEBUG("%s\n", __func__);
52
53 drm_fbdev_cma_restore_mode(ldev->fbdev);
54}
55
56DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
57
58static struct drm_driver drv_driver = {
59 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
60 DRIVER_ATOMIC,
61 .lastclose = drv_lastclose,
62 .name = DRIVER_NAME,
63 .desc = DRIVER_DESC,
64 .date = DRIVER_DATE,
65 .major = DRIVER_MAJOR,
66 .minor = DRIVER_MINOR,
67 .patchlevel = DRIVER_PATCH_LEVEL,
68 .fops = &drv_driver_fops,
69 .dumb_create = drm_gem_cma_dumb_create,
70 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
71 .dumb_destroy = drm_gem_dumb_destroy,
72 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
73 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
74 .gem_free_object_unlocked = drm_gem_cma_free_object,
75 .gem_vm_ops = &drm_gem_cma_vm_ops,
76 .gem_prime_export = drm_gem_prime_export,
77 .gem_prime_import = drm_gem_prime_import,
78 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
79 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
80 .gem_prime_vmap = drm_gem_cma_prime_vmap,
81 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
82 .gem_prime_mmap = drm_gem_cma_prime_mmap,
83 .enable_vblank = ltdc_crtc_enable_vblank,
84 .disable_vblank = ltdc_crtc_disable_vblank,
85};
86
87static int drv_load(struct drm_device *ddev)
88{
89 struct platform_device *pdev = to_platform_device(ddev->dev);
90 struct drm_fbdev_cma *fbdev;
91 struct ltdc_device *ldev;
92 int ret;
93
94 DRM_DEBUG("%s\n", __func__);
95
96 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
97 if (!ldev)
98 return -ENOMEM;
99
100 ddev->dev_private = (void *)ldev;
101
102 drm_mode_config_init(ddev);
103
104 /*
105 * set max width and height as default value.
106 * this value would be used to check framebuffer size limitation
107 * at drm_mode_addfb().
108 */
109 ddev->mode_config.min_width = 0;
110 ddev->mode_config.min_height = 0;
111 ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
112 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
113 ddev->mode_config.funcs = &drv_mode_config_funcs;
114
115 ret = ltdc_load(ddev);
116 if (ret)
117 goto err;
118
119 drm_mode_config_reset(ddev);
120 drm_kms_helper_poll_init(ddev);
121
122 if (ddev->mode_config.num_connector) {
123 ldev = ddev->dev_private;
124 fbdev = drm_fbdev_cma_init(ddev, 16,
125 ddev->mode_config.num_connector);
126 if (IS_ERR(fbdev)) {
127 DRM_DEBUG("Warning: fails to create fbdev\n");
128 fbdev = NULL;
129 }
130 ldev->fbdev = fbdev;
131 }
132
133 platform_set_drvdata(pdev, ddev);
134
135 return 0;
136err:
137 drm_mode_config_cleanup(ddev);
138 return ret;
139}
140
141static void drv_unload(struct drm_device *ddev)
142{
143 struct ltdc_device *ldev = ddev->dev_private;
144
145 DRM_DEBUG("%s\n", __func__);
146
147 if (ldev->fbdev) {
148 drm_fbdev_cma_fini(ldev->fbdev);
149 ldev->fbdev = NULL;
150 }
151 drm_kms_helper_poll_fini(ddev);
152 ltdc_unload(ddev);
153 drm_mode_config_cleanup(ddev);
154}
155
156static int stm_drm_platform_probe(struct platform_device *pdev)
157{
158 struct device *dev = &pdev->dev;
159 struct drm_device *ddev;
160 int ret;
161
162 DRM_DEBUG("%s\n", __func__);
163
164 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
165
166 ddev = drm_dev_alloc(&drv_driver, dev);
167 if (IS_ERR(ddev))
168 return PTR_ERR(ddev);
169
170 ret = drv_load(ddev);
171 if (ret)
172 goto err_unref;
173
174 ret = drm_dev_register(ddev, 0);
175 if (ret)
176 goto err_unref;
177
178 return 0;
179
180err_unref:
181 drm_dev_unref(ddev);
182
183 return ret;
184}
185
186static int stm_drm_platform_remove(struct platform_device *pdev)
187{
188 struct drm_device *ddev = platform_get_drvdata(pdev);
189
190 DRM_DEBUG("%s\n", __func__);
191
192 drm_dev_unregister(ddev);
193 drv_unload(ddev);
194 drm_dev_unref(ddev);
195
196 return 0;
197}
198
199static const struct of_device_id drv_dt_ids[] = {
200 { .compatible = "st,stm32-ltdc"},
201 { /* end node */ },
202};
203MODULE_DEVICE_TABLE(of, drv_dt_ids);
204
205static struct platform_driver stm_drm_platform_driver = {
206 .probe = stm_drm_platform_probe,
207 .remove = stm_drm_platform_remove,
208 .driver = {
209 .name = DRIVER_NAME,
210 .of_match_table = drv_dt_ids,
211 },
212};
213
214module_platform_driver(stm_drm_platform_driver);
215
216MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
217MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
218MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
219MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
220MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
221MODULE_LICENSE("GPL v2");