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Merge tag 'acpi-fix-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[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_cma_helper.h>
68 #include <drm/drm_of.h>
69 #include <drm/drm_bridge.h>
70 #include <drm/drm_panel.h>
71
72 #include "pl111_drm.h"
73 #include "pl111_versatile.h"
74
75 #define DRIVER_DESC      "DRM module for PL111"
76
77 static const struct drm_mode_config_funcs mode_config_funcs = {
78         .fb_create = drm_gem_fb_create,
79         .atomic_check = drm_atomic_helper_check,
80         .atomic_commit = drm_atomic_helper_commit,
81 };
82
83 static int pl111_modeset_init(struct drm_device *dev)
84 {
85         struct drm_mode_config *mode_config;
86         struct pl111_drm_dev_private *priv = dev->dev_private;
87         struct drm_panel *panel;
88         struct drm_bridge *bridge;
89         int ret = 0;
90
91         drm_mode_config_init(dev);
92         mode_config = &dev->mode_config;
93         mode_config->funcs = &mode_config_funcs;
94         mode_config->min_width = 1;
95         mode_config->max_width = 1024;
96         mode_config->min_height = 1;
97         mode_config->max_height = 768;
98
99         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
100                                           0, 0, &panel, &bridge);
101         if (ret && ret != -ENODEV)
102                 return ret;
103         if (panel) {
104                 bridge = drm_panel_bridge_add(panel,
105                                               DRM_MODE_CONNECTOR_Unknown);
106                 if (IS_ERR(bridge)) {
107                         ret = PTR_ERR(bridge);
108                         goto out_config;
109                 }
110                 /*
111                  * TODO: when we are using a different bridge than a panel
112                  * (such as a dumb VGA connector) we need to devise a different
113                  * method to get the connector out of the bridge.
114                  */
115         }
116
117         ret = pl111_display_init(dev);
118         if (ret != 0) {
119                 dev_err(dev->dev, "Failed to init display\n");
120                 goto out_bridge;
121         }
122
123         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
124                                                     bridge);
125         if (ret)
126                 return ret;
127
128         priv->bridge = bridge;
129         priv->panel = panel;
130         priv->connector = panel->connector;
131
132         ret = drm_vblank_init(dev, 1);
133         if (ret != 0) {
134                 dev_err(dev->dev, "Failed to init vblank\n");
135                 goto out_bridge;
136         }
137
138         drm_mode_config_reset(dev);
139
140         priv->fbdev = drm_fbdev_cma_init(dev, 32,
141                                          dev->mode_config.num_connector);
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 void pl111_lastclose(struct drm_device *dev)
159 {
160         struct pl111_drm_dev_private *priv = dev->dev_private;
161
162         drm_fbdev_cma_restore_mode(priv->fbdev);
163 }
164
165 static struct drm_driver pl111_drm_driver = {
166         .driver_features =
167                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
168         .lastclose = pl111_lastclose,
169         .ioctls = NULL,
170         .fops = &drm_fops,
171         .name = "pl111",
172         .desc = DRIVER_DESC,
173         .date = "20170317",
174         .major = 1,
175         .minor = 0,
176         .patchlevel = 0,
177         .dumb_create = drm_gem_cma_dumb_create,
178         .gem_free_object_unlocked = drm_gem_cma_free_object,
179         .gem_vm_ops = &drm_gem_cma_vm_ops,
180
181         .enable_vblank = pl111_enable_vblank,
182         .disable_vblank = pl111_disable_vblank,
183
184         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
185         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
186         .gem_prime_import = drm_gem_prime_import,
187         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
188         .gem_prime_export = drm_gem_prime_export,
189         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
190
191 #if defined(CONFIG_DEBUG_FS)
192         .debugfs_init = pl111_debugfs_init,
193 #endif
194 };
195
196 static int pl111_amba_probe(struct amba_device *amba_dev,
197                             const struct amba_id *id)
198 {
199         struct device *dev = &amba_dev->dev;
200         struct pl111_drm_dev_private *priv;
201         struct pl111_variant_data *variant = id->data;
202         struct drm_device *drm;
203         int ret;
204
205         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
206         if (!priv)
207                 return -ENOMEM;
208
209         drm = drm_dev_alloc(&pl111_drm_driver, dev);
210         if (IS_ERR(drm))
211                 return PTR_ERR(drm);
212         amba_set_drvdata(amba_dev, drm);
213         priv->drm = drm;
214         drm->dev_private = priv;
215         priv->variant = variant;
216
217         /*
218          * The PL110 and PL111 variants have two registers
219          * swapped: interrupt enable and control. For this reason
220          * we use offsets that we can change per variant.
221          */
222         if (variant->is_pl110) {
223                 /*
224                  * The ARM Versatile boards are even more special:
225                  * their PrimeCell ID say they are PL110 but the
226                  * control and interrupt enable registers are anyway
227                  * swapped to the PL111 order so they are not following
228                  * the PL110 datasheet.
229                  */
230                 if (of_machine_is_compatible("arm,versatile-ab") ||
231                     of_machine_is_compatible("arm,versatile-pb")) {
232                         priv->ienb = CLCD_PL111_IENB;
233                         priv->ctrl = CLCD_PL111_CNTL;
234                 } else {
235                         priv->ienb = CLCD_PL110_IENB;
236                         priv->ctrl = CLCD_PL110_CNTL;
237                 }
238         } else {
239                 priv->ienb = CLCD_PL111_IENB;
240                 priv->ctrl = CLCD_PL111_CNTL;
241         }
242
243         priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
244         if (IS_ERR(priv->regs)) {
245                 dev_err(dev, "%s failed mmio\n", __func__);
246                 return PTR_ERR(priv->regs);
247         }
248
249         /* turn off interrupts before requesting the irq */
250         writel(0, priv->regs + priv->ienb);
251
252         ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
253                                variant->name, priv);
254         if (ret != 0) {
255                 dev_err(dev, "%s failed irq %d\n", __func__, ret);
256                 return ret;
257         }
258
259         ret = pl111_versatile_init(dev, priv);
260         if (ret)
261                 goto dev_unref;
262
263         ret = pl111_modeset_init(drm);
264         if (ret != 0)
265                 goto dev_unref;
266
267         ret = drm_dev_register(drm, 0);
268         if (ret < 0)
269                 goto dev_unref;
270
271         return 0;
272
273 dev_unref:
274         drm_dev_unref(drm);
275         return ret;
276 }
277
278 static int pl111_amba_remove(struct amba_device *amba_dev)
279 {
280         struct drm_device *drm = amba_get_drvdata(amba_dev);
281         struct pl111_drm_dev_private *priv = drm->dev_private;
282
283         drm_dev_unregister(drm);
284         if (priv->fbdev)
285                 drm_fbdev_cma_fini(priv->fbdev);
286         if (priv->panel)
287                 drm_panel_bridge_remove(priv->bridge);
288         drm_mode_config_cleanup(drm);
289         drm_dev_unref(drm);
290
291         return 0;
292 }
293
294 /*
295  * This variant exist in early versions like the ARM Integrator
296  * and this version lacks the 565 and 444 pixel formats.
297  */
298 static const u32 pl110_pixel_formats[] = {
299         DRM_FORMAT_ABGR8888,
300         DRM_FORMAT_XBGR8888,
301         DRM_FORMAT_ARGB8888,
302         DRM_FORMAT_XRGB8888,
303         DRM_FORMAT_ABGR1555,
304         DRM_FORMAT_XBGR1555,
305         DRM_FORMAT_ARGB1555,
306         DRM_FORMAT_XRGB1555,
307 };
308
309 static const struct pl111_variant_data pl110_variant = {
310         .name = "PL110",
311         .is_pl110 = true,
312         .formats = pl110_pixel_formats,
313         .nformats = ARRAY_SIZE(pl110_pixel_formats),
314 };
315
316 /* RealView, Versatile Express etc use this modern variant */
317 static const u32 pl111_pixel_formats[] = {
318         DRM_FORMAT_ABGR8888,
319         DRM_FORMAT_XBGR8888,
320         DRM_FORMAT_ARGB8888,
321         DRM_FORMAT_XRGB8888,
322         DRM_FORMAT_BGR565,
323         DRM_FORMAT_RGB565,
324         DRM_FORMAT_ABGR1555,
325         DRM_FORMAT_XBGR1555,
326         DRM_FORMAT_ARGB1555,
327         DRM_FORMAT_XRGB1555,
328         DRM_FORMAT_ABGR4444,
329         DRM_FORMAT_XBGR4444,
330         DRM_FORMAT_ARGB4444,
331         DRM_FORMAT_XRGB4444,
332 };
333
334 static const struct pl111_variant_data pl111_variant = {
335         .name = "PL111",
336         .formats = pl111_pixel_formats,
337         .nformats = ARRAY_SIZE(pl111_pixel_formats),
338 };
339
340 static const struct amba_id pl111_id_table[] = {
341         {
342                 .id = 0x00041110,
343                 .mask = 0x000fffff,
344                 .data = (void*)&pl110_variant,
345         },
346         {
347                 .id = 0x00041111,
348                 .mask = 0x000fffff,
349                 .data = (void*)&pl111_variant,
350         },
351         {0, 0},
352 };
353
354 static struct amba_driver pl111_amba_driver __maybe_unused = {
355         .drv = {
356                 .name = "drm-clcd-pl111",
357         },
358         .probe = pl111_amba_probe,
359         .remove = pl111_amba_remove,
360         .id_table = pl111_id_table,
361 };
362
363 #ifdef CONFIG_ARM_AMBA
364 module_amba_driver(pl111_amba_driver);
365 #endif
366
367 MODULE_DESCRIPTION(DRIVER_DESC);
368 MODULE_AUTHOR("ARM Ltd.");
369 MODULE_LICENSE("GPL");
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