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