2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
13 #include <linux/component.h>
14 #include <linux/of_graph.h>
15 #include <linux/of_reserved_mem.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_fb_cma_helper.h>
20 #include <drm/drm_gem_cma_helper.h>
21 #include <drm/drm_fb_helper.h>
22 #include <drm/drm_of.h>
24 #include "sun4i_drv.h"
25 #include "sun4i_framebuffer.h"
26 #include "sun4i_tcon.h"
28 static const struct file_operations sun4i_drv_fops
= {
31 .release
= drm_release
,
32 .unlocked_ioctl
= drm_ioctl
,
33 .compat_ioctl
= drm_compat_ioctl
,
37 .mmap
= drm_gem_cma_mmap
,
40 static struct drm_driver sun4i_drv_driver
= {
41 .driver_features
= DRIVER_GEM
| DRIVER_MODESET
| DRIVER_PRIME
| DRIVER_ATOMIC
,
43 /* Generic Operations */
44 .fops
= &sun4i_drv_fops
,
46 .desc
= "Allwinner sun4i Display Engine",
52 .dumb_create
= drm_gem_cma_dumb_create
,
53 .dumb_destroy
= drm_gem_dumb_destroy
,
54 .dumb_map_offset
= drm_gem_cma_dumb_map_offset
,
55 .gem_free_object_unlocked
= drm_gem_cma_free_object
,
56 .gem_vm_ops
= &drm_gem_cma_vm_ops
,
58 /* PRIME Operations */
59 .prime_handle_to_fd
= drm_gem_prime_handle_to_fd
,
60 .prime_fd_to_handle
= drm_gem_prime_fd_to_handle
,
61 .gem_prime_import
= drm_gem_prime_import
,
62 .gem_prime_export
= drm_gem_prime_export
,
63 .gem_prime_get_sg_table
= drm_gem_cma_prime_get_sg_table
,
64 .gem_prime_import_sg_table
= drm_gem_cma_prime_import_sg_table
,
65 .gem_prime_vmap
= drm_gem_cma_prime_vmap
,
66 .gem_prime_vunmap
= drm_gem_cma_prime_vunmap
,
67 .gem_prime_mmap
= drm_gem_cma_prime_mmap
,
69 /* Frame Buffer Operations */
72 static void sun4i_remove_framebuffers(void)
74 struct apertures_struct
*ap
;
76 ap
= alloc_apertures(1);
80 /* The framebuffer can be located anywhere in RAM */
81 ap
->ranges
[0].base
= 0;
82 ap
->ranges
[0].size
= ~0;
84 drm_fb_helper_remove_conflicting_framebuffers(ap
, "sun4i-drm-fb", false);
88 static int sun4i_drv_bind(struct device
*dev
)
90 struct drm_device
*drm
;
91 struct sun4i_drv
*drv
;
94 drm
= drm_dev_alloc(&sun4i_drv_driver
, dev
);
98 drv
= devm_kzalloc(dev
, sizeof(*drv
), GFP_KERNEL
);
103 drm
->dev_private
= drv
;
105 ret
= of_reserved_mem_device_init(dev
);
106 if (ret
&& ret
!= -ENODEV
) {
107 dev_err(drm
->dev
, "Couldn't claim our memory region\n");
111 /* drm_vblank_init calls kcalloc, which can fail */
112 ret
= drm_vblank_init(drm
, 1);
114 goto free_mem_region
;
116 drm_mode_config_init(drm
);
118 ret
= component_bind_all(drm
->dev
, drm
);
120 dev_err(drm
->dev
, "Couldn't bind all pipelines components\n");
121 goto cleanup_mode_config
;
124 drm
->irq_enabled
= true;
126 /* Remove early framebuffers (ie. simplefb) */
127 sun4i_remove_framebuffers();
129 /* Create our framebuffer */
130 drv
->fbdev
= sun4i_framebuffer_init(drm
);
131 if (IS_ERR(drv
->fbdev
)) {
132 dev_err(drm
->dev
, "Couldn't create our framebuffer\n");
133 ret
= PTR_ERR(drv
->fbdev
);
134 goto cleanup_mode_config
;
137 /* Enable connectors polling */
138 drm_kms_helper_poll_init(drm
);
140 ret
= drm_dev_register(drm
, 0);
147 drm_kms_helper_poll_fini(drm
);
148 sun4i_framebuffer_free(drm
);
150 drm_mode_config_cleanup(drm
);
151 drm_vblank_cleanup(drm
);
153 of_reserved_mem_device_release(dev
);
159 static void sun4i_drv_unbind(struct device
*dev
)
161 struct drm_device
*drm
= dev_get_drvdata(dev
);
163 drm_dev_unregister(drm
);
164 drm_kms_helper_poll_fini(drm
);
165 sun4i_framebuffer_free(drm
);
166 drm_mode_config_cleanup(drm
);
167 drm_vblank_cleanup(drm
);
168 of_reserved_mem_device_release(dev
);
172 static const struct component_master_ops sun4i_drv_master_ops
= {
173 .bind
= sun4i_drv_bind
,
174 .unbind
= sun4i_drv_unbind
,
177 static bool sun4i_drv_node_is_frontend(struct device_node
*node
)
179 return of_device_is_compatible(node
, "allwinner,sun5i-a13-display-frontend") ||
180 of_device_is_compatible(node
, "allwinner,sun6i-a31-display-frontend") ||
181 of_device_is_compatible(node
, "allwinner,sun8i-a33-display-frontend");
184 static bool sun4i_drv_node_is_tcon(struct device_node
*node
)
186 return of_device_is_compatible(node
, "allwinner,sun5i-a13-tcon") ||
187 of_device_is_compatible(node
, "allwinner,sun6i-a31-tcon") ||
188 of_device_is_compatible(node
, "allwinner,sun6i-a31s-tcon") ||
189 of_device_is_compatible(node
, "allwinner,sun8i-a33-tcon");
192 static int compare_of(struct device
*dev
, void *data
)
194 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
195 of_node_full_name(dev
->of_node
),
196 of_node_full_name(data
));
198 return dev
->of_node
== data
;
201 static int sun4i_drv_add_endpoints(struct device
*dev
,
202 struct component_match
**match
,
203 struct device_node
*node
)
205 struct device_node
*port
, *ep
, *remote
;
209 * We don't support the frontend for now, so we will never
210 * have a device bound. Just skip over it, but we still want
211 * the rest our pipeline to be added.
213 if (!sun4i_drv_node_is_frontend(node
) &&
214 !of_device_is_available(node
))
217 if (!sun4i_drv_node_is_frontend(node
)) {
218 /* Add current component */
219 DRM_DEBUG_DRIVER("Adding component %s\n",
220 of_node_full_name(node
));
221 drm_of_component_match_add(dev
, match
, compare_of
, node
);
225 /* Inputs are listed first, then outputs */
226 port
= of_graph_get_port_by_id(node
, 1);
228 DRM_DEBUG_DRIVER("No output to bind\n");
232 for_each_available_child_of_node(port
, ep
) {
233 remote
= of_graph_get_remote_port_parent(ep
);
235 DRM_DEBUG_DRIVER("Error retrieving the output node\n");
241 * If the node is our TCON, the first port is used for
242 * panel or bridges, and will not be part of the
243 * component framework.
245 if (sun4i_drv_node_is_tcon(node
)) {
246 struct of_endpoint endpoint
;
248 if (of_graph_parse_endpoint(ep
, &endpoint
)) {
249 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
254 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
259 /* Walk down our tree */
260 count
+= sun4i_drv_add_endpoints(dev
, match
, remote
);
268 static int sun4i_drv_probe(struct platform_device
*pdev
)
270 struct component_match
*match
= NULL
;
271 struct device_node
*np
= pdev
->dev
.of_node
;
275 struct device_node
*pipeline
= of_parse_phandle(np
,
276 "allwinner,pipelines",
281 count
+= sun4i_drv_add_endpoints(&pdev
->dev
, &match
,
283 of_node_put(pipeline
);
285 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
290 return component_master_add_with_match(&pdev
->dev
,
291 &sun4i_drv_master_ops
,
297 static int sun4i_drv_remove(struct platform_device
*pdev
)
302 static const struct of_device_id sun4i_drv_of_table
[] = {
303 { .compatible
= "allwinner,sun5i-a13-display-engine" },
304 { .compatible
= "allwinner,sun6i-a31-display-engine" },
305 { .compatible
= "allwinner,sun6i-a31s-display-engine" },
306 { .compatible
= "allwinner,sun8i-a33-display-engine" },
309 MODULE_DEVICE_TABLE(of
, sun4i_drv_of_table
);
311 static struct platform_driver sun4i_drv_platform_driver
= {
312 .probe
= sun4i_drv_probe
,
313 .remove
= sun4i_drv_remove
,
316 .of_match_table
= sun4i_drv_of_table
,
319 module_platform_driver(sun4i_drv_platform_driver
);
321 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
322 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
323 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
324 MODULE_LICENSE("GPL");