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Merge branch 'parisc-4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[linux.git] / drivers / gpu / drm / pl111 / pl111_drv.c
1 /*
2  * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
3  *
4  * Parts of this file were based on sources as follows:
5  *
6  * Copyright (c) 2006-2008 Intel Corporation
7  * Copyright (c) 2007 Dave Airlie <[email protected]>
8  * Copyright (C) 2011 Texas Instruments
9  *
10  * This program is free software and is provided to you under the terms of the
11  * GNU General Public License version 2 as published by the Free Software
12  * Foundation, and any use by you of this program is subject to the terms of
13  * such GNU licence.
14  *
15  */
16
17 /**
18  * DOC: ARM PrimeCell PL111 CLCD Driver
19  *
20  * The PL111 is a simple LCD controller that can support TFT and STN
21  * displays.  This driver exposes a standard KMS interface for them.
22  *
23  * This driver uses the same Device Tree binding as the fbdev CLCD
24  * driver.  While the fbdev driver supports panels that may be
25  * connected to the CLCD internally to the CLCD driver, in DRM the
26  * panels get split out to drivers/gpu/drm/panels/.  This means that,
27  * in converting from using fbdev to using DRM, you also need to write
28  * a panel driver (which may be as simple as an entry in
29  * panel-simple.c).
30  *
31  * The driver currently doesn't expose the cursor.  The DRM API for
32  * cursors requires support for 64x64 ARGB8888 cursor images, while
33  * the hardware can only support 64x64 monochrome with masking
34  * cursors.  While one could imagine trying to hack something together
35  * to look at the ARGB8888 and program reasonable in monochrome, we
36  * just don't expose the cursor at all instead, and leave cursor
37  * support to the X11 software cursor layer.
38  *
39  * TODO:
40  *
41  * - Fix race between setting plane base address and getting IRQ for
42  *   vsync firing the pageflip completion.
43  *
44  * - Use the "max-memory-bandwidth" DT property to filter the
45  *   supported formats.
46  *
47  * - Read back hardware state at boot to skip reprogramming the
48  *   hardware when doing a no-op modeset.
49  *
50  * - Use the CLKSEL bit to support switching between the two external
51  *   clock parents.
52  */
53
54 #include <linux/amba/bus.h>
55 #include <linux/amba/clcd-regs.h>
56 #include <linux/version.h>
57 #include <linux/shmem_fs.h>
58 #include <linux/dma-buf.h>
59 #include <linux/module.h>
60 #include <linux/slab.h>
61
62 #include <drm/drmP.h>
63 #include <drm/drm_atomic_helper.h>
64 #include <drm/drm_crtc_helper.h>
65 #include <drm/drm_gem_cma_helper.h>
66 #include <drm/drm_gem_framebuffer_helper.h>
67 #include <drm/drm_fb_helper.h>
68 #include <drm/drm_fb_cma_helper.h>
69 #include <drm/drm_of.h>
70 #include <drm/drm_bridge.h>
71 #include <drm/drm_panel.h>
72
73 #include "pl111_drm.h"
74 #include "pl111_versatile.h"
75
76 #define DRIVER_DESC      "DRM module for PL111"
77
78 static const struct drm_mode_config_funcs mode_config_funcs = {
79         .fb_create = drm_gem_fb_create,
80         .atomic_check = drm_atomic_helper_check,
81         .atomic_commit = drm_atomic_helper_commit,
82 };
83
84 static int pl111_modeset_init(struct drm_device *dev)
85 {
86         struct drm_mode_config *mode_config;
87         struct pl111_drm_dev_private *priv = dev->dev_private;
88         struct drm_panel *panel;
89         struct drm_bridge *bridge;
90         int ret = 0;
91
92         drm_mode_config_init(dev);
93         mode_config = &dev->mode_config;
94         mode_config->funcs = &mode_config_funcs;
95         mode_config->min_width = 1;
96         mode_config->max_width = 1024;
97         mode_config->min_height = 1;
98         mode_config->max_height = 768;
99
100         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
101                                           0, 0, &panel, &bridge);
102         if (ret && ret != -ENODEV)
103                 return ret;
104         if (panel) {
105                 bridge = drm_panel_bridge_add(panel,
106                                               DRM_MODE_CONNECTOR_Unknown);
107                 if (IS_ERR(bridge)) {
108                         ret = PTR_ERR(bridge);
109                         goto out_config;
110                 }
111                 /*
112                  * TODO: when we are using a different bridge than a panel
113                  * (such as a dumb VGA connector) we need to devise a different
114                  * method to get the connector out of the bridge.
115                  */
116         }
117
118         ret = pl111_display_init(dev);
119         if (ret != 0) {
120                 dev_err(dev->dev, "Failed to init display\n");
121                 goto out_bridge;
122         }
123
124         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
125                                                     bridge);
126         if (ret)
127                 return ret;
128
129         priv->bridge = bridge;
130         priv->panel = panel;
131         priv->connector = panel->connector;
132
133         ret = drm_vblank_init(dev, 1);
134         if (ret != 0) {
135                 dev_err(dev->dev, "Failed to init vblank\n");
136                 goto out_bridge;
137         }
138
139         drm_mode_config_reset(dev);
140
141         drm_fb_cma_fbdev_init(dev, 32, 0);
142
143         drm_kms_helper_poll_init(dev);
144
145         goto finish;
146
147 out_bridge:
148         if (panel)
149                 drm_panel_bridge_remove(bridge);
150 out_config:
151         drm_mode_config_cleanup(dev);
152 finish:
153         return ret;
154 }
155
156 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
157
158 static struct drm_driver pl111_drm_driver = {
159         .driver_features =
160                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
161         .lastclose = drm_fb_helper_lastclose,
162         .ioctls = NULL,
163         .fops = &drm_fops,
164         .name = "pl111",
165         .desc = DRIVER_DESC,
166         .date = "20170317",
167         .major = 1,
168         .minor = 0,
169         .patchlevel = 0,
170         .dumb_create = drm_gem_cma_dumb_create,
171         .gem_free_object_unlocked = drm_gem_cma_free_object,
172         .gem_vm_ops = &drm_gem_cma_vm_ops,
173
174         .enable_vblank = pl111_enable_vblank,
175         .disable_vblank = pl111_disable_vblank,
176
177         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
178         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
179         .gem_prime_import = drm_gem_prime_import,
180         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
181         .gem_prime_export = drm_gem_prime_export,
182         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
183
184 #if defined(CONFIG_DEBUG_FS)
185         .debugfs_init = pl111_debugfs_init,
186 #endif
187 };
188
189 static int pl111_amba_probe(struct amba_device *amba_dev,
190                             const struct amba_id *id)
191 {
192         struct device *dev = &amba_dev->dev;
193         struct pl111_drm_dev_private *priv;
194         struct pl111_variant_data *variant = id->data;
195         struct drm_device *drm;
196         int ret;
197
198         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
199         if (!priv)
200                 return -ENOMEM;
201
202         drm = drm_dev_alloc(&pl111_drm_driver, dev);
203         if (IS_ERR(drm))
204                 return PTR_ERR(drm);
205         amba_set_drvdata(amba_dev, drm);
206         priv->drm = drm;
207         drm->dev_private = priv;
208         priv->variant = variant;
209
210         /*
211          * The PL110 and PL111 variants have two registers
212          * swapped: interrupt enable and control. For this reason
213          * we use offsets that we can change per variant.
214          */
215         if (variant->is_pl110) {
216                 /*
217                  * The ARM Versatile boards are even more special:
218                  * their PrimeCell ID say they are PL110 but the
219                  * control and interrupt enable registers are anyway
220                  * swapped to the PL111 order so they are not following
221                  * the PL110 datasheet.
222                  */
223                 if (of_machine_is_compatible("arm,versatile-ab") ||
224                     of_machine_is_compatible("arm,versatile-pb")) {
225                         priv->ienb = CLCD_PL111_IENB;
226                         priv->ctrl = CLCD_PL111_CNTL;
227                 } else {
228                         priv->ienb = CLCD_PL110_IENB;
229                         priv->ctrl = CLCD_PL110_CNTL;
230                 }
231         } else {
232                 priv->ienb = CLCD_PL111_IENB;
233                 priv->ctrl = CLCD_PL111_CNTL;
234         }
235
236         priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
237         if (IS_ERR(priv->regs)) {
238                 dev_err(dev, "%s failed mmio\n", __func__);
239                 return PTR_ERR(priv->regs);
240         }
241
242         /* turn off interrupts before requesting the irq */
243         writel(0, priv->regs + priv->ienb);
244
245         ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
246                                variant->name, priv);
247         if (ret != 0) {
248                 dev_err(dev, "%s failed irq %d\n", __func__, ret);
249                 return ret;
250         }
251
252         ret = pl111_versatile_init(dev, priv);
253         if (ret)
254                 goto dev_unref;
255
256         ret = pl111_modeset_init(drm);
257         if (ret != 0)
258                 goto dev_unref;
259
260         ret = drm_dev_register(drm, 0);
261         if (ret < 0)
262                 goto dev_unref;
263
264         return 0;
265
266 dev_unref:
267         drm_dev_unref(drm);
268         return ret;
269 }
270
271 static int pl111_amba_remove(struct amba_device *amba_dev)
272 {
273         struct drm_device *drm = amba_get_drvdata(amba_dev);
274         struct pl111_drm_dev_private *priv = drm->dev_private;
275
276         drm_dev_unregister(drm);
277         drm_fb_cma_fbdev_fini(drm);
278         if (priv->panel)
279                 drm_panel_bridge_remove(priv->bridge);
280         drm_mode_config_cleanup(drm);
281         drm_dev_unref(drm);
282
283         return 0;
284 }
285
286 /*
287  * This variant exist in early versions like the ARM Integrator
288  * and this version lacks the 565 and 444 pixel formats.
289  */
290 static const u32 pl110_pixel_formats[] = {
291         DRM_FORMAT_ABGR8888,
292         DRM_FORMAT_XBGR8888,
293         DRM_FORMAT_ARGB8888,
294         DRM_FORMAT_XRGB8888,
295         DRM_FORMAT_ABGR1555,
296         DRM_FORMAT_XBGR1555,
297         DRM_FORMAT_ARGB1555,
298         DRM_FORMAT_XRGB1555,
299 };
300
301 static const struct pl111_variant_data pl110_variant = {
302         .name = "PL110",
303         .is_pl110 = true,
304         .formats = pl110_pixel_formats,
305         .nformats = ARRAY_SIZE(pl110_pixel_formats),
306 };
307
308 /* RealView, Versatile Express etc use this modern variant */
309 static const u32 pl111_pixel_formats[] = {
310         DRM_FORMAT_ABGR8888,
311         DRM_FORMAT_XBGR8888,
312         DRM_FORMAT_ARGB8888,
313         DRM_FORMAT_XRGB8888,
314         DRM_FORMAT_BGR565,
315         DRM_FORMAT_RGB565,
316         DRM_FORMAT_ABGR1555,
317         DRM_FORMAT_XBGR1555,
318         DRM_FORMAT_ARGB1555,
319         DRM_FORMAT_XRGB1555,
320         DRM_FORMAT_ABGR4444,
321         DRM_FORMAT_XBGR4444,
322         DRM_FORMAT_ARGB4444,
323         DRM_FORMAT_XRGB4444,
324 };
325
326 static const struct pl111_variant_data pl111_variant = {
327         .name = "PL111",
328         .formats = pl111_pixel_formats,
329         .nformats = ARRAY_SIZE(pl111_pixel_formats),
330 };
331
332 static const struct amba_id pl111_id_table[] = {
333         {
334                 .id = 0x00041110,
335                 .mask = 0x000fffff,
336                 .data = (void*)&pl110_variant,
337         },
338         {
339                 .id = 0x00041111,
340                 .mask = 0x000fffff,
341                 .data = (void*)&pl111_variant,
342         },
343         {0, 0},
344 };
345
346 static struct amba_driver pl111_amba_driver __maybe_unused = {
347         .drv = {
348                 .name = "drm-clcd-pl111",
349         },
350         .probe = pl111_amba_probe,
351         .remove = pl111_amba_remove,
352         .id_table = pl111_id_table,
353 };
354
355 #ifdef CONFIG_ARM_AMBA
356 module_amba_driver(pl111_amba_driver);
357 #endif
358
359 MODULE_DESCRIPTION(DRIVER_DESC);
360 MODULE_AUTHOR("ARM Ltd.");
361 MODULE_LICENSE("GPL");
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