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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
4 *
5 * Parts of this file were based on sources as follows:
6 *
7 * Copyright (c) 2006-2008 Intel Corporation
8 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
9 * Copyright (C) 2011 Texas Instruments
10 */
11
12/**
13 * DOC: ARM PrimeCell PL110 and PL111 CLCD Driver
14 *
15 * The PL110/PL111 is a simple LCD controller that can support TFT
16 * and STN displays. This driver exposes a standard KMS interface
17 * for them.
18 *
19 * The driver currently doesn't expose the cursor. The DRM API for
20 * cursors requires support for 64x64 ARGB8888 cursor images, while
21 * the hardware can only support 64x64 monochrome with masking
22 * cursors. While one could imagine trying to hack something together
23 * to look at the ARGB8888 and program reasonable in monochrome, we
24 * just don't expose the cursor at all instead, and leave cursor
25 * support to the application software cursor layer.
26 *
27 * TODO:
28 *
29 * - Fix race between setting plane base address and getting IRQ for
30 * vsync firing the pageflip completion.
31 *
32 * - Read back hardware state at boot to skip reprogramming the
33 * hardware when doing a no-op modeset.
34 *
35 * - Use the CLKSEL bit to support switching between the two external
36 * clock parents.
37 */
38
39#include <linux/amba/bus.h>
40#include <linux/dma-buf.h>
41#include <linux/module.h>
42#include <linux/of.h>
43#include <linux/of_graph.h>
44#include <linux/of_reserved_mem.h>
45#include <linux/shmem_fs.h>
46#include <linux/slab.h>
47
48#include <drm/drm_atomic_helper.h>
49#include <drm/drm_bridge.h>
50#include <drm/drm_drv.h>
51#include <drm/drm_fbdev_dma.h>
52#include <drm/drm_fourcc.h>
53#include <drm/drm_gem_dma_helper.h>
54#include <drm/drm_gem_framebuffer_helper.h>
55#include <drm/drm_of.h>
56#include <drm/drm_panel.h>
57#include <drm/drm_probe_helper.h>
58#include <drm/drm_vblank.h>
59
60#include "pl111_drm.h"
61#include "pl111_versatile.h"
62#include "pl111_nomadik.h"
63
64#define DRIVER_DESC "DRM module for PL111"
65
66static const struct drm_mode_config_funcs mode_config_funcs = {
67 .fb_create = drm_gem_fb_create,
68 .atomic_check = drm_atomic_helper_check,
69 .atomic_commit = drm_atomic_helper_commit,
70};
71
72static int pl111_modeset_init(struct drm_device *dev)
73{
74 struct drm_mode_config *mode_config;
75 struct pl111_drm_dev_private *priv = dev->dev_private;
76 struct device_node *np = dev->dev->of_node;
77 struct device_node *remote;
78 struct drm_panel *panel = NULL;
79 struct drm_bridge *bridge = NULL;
80 bool defer = false;
81 int ret;
82 int i;
83
84 ret = drmm_mode_config_init(dev);
85 if (ret)
86 return ret;
87
88 mode_config = &dev->mode_config;
89 mode_config->funcs = &mode_config_funcs;
90 mode_config->min_width = 1;
91 mode_config->max_width = 1024;
92 mode_config->min_height = 1;
93 mode_config->max_height = 768;
94
95 i = 0;
96 for_each_endpoint_of_node(np, remote) {
97 struct drm_panel *tmp_panel;
98 struct drm_bridge *tmp_bridge;
99
100 dev_dbg(dev->dev, "checking endpoint %d\n", i);
101
102 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
103 0, i,
104 &tmp_panel,
105 &tmp_bridge);
106 if (ret) {
107 if (ret == -EPROBE_DEFER) {
108 /*
109 * Something deferred, but that is often just
110 * another way of saying -ENODEV, but let's
111 * cast a vote for later deferral.
112 */
113 defer = true;
114 } else if (ret != -ENODEV) {
115 /* Continue, maybe something else is working */
116 dev_err(dev->dev,
117 "endpoint %d returns %d\n", i, ret);
118 }
119 }
120
121 if (tmp_panel) {
122 dev_info(dev->dev,
123 "found panel on endpoint %d\n", i);
124 panel = tmp_panel;
125 }
126 if (tmp_bridge) {
127 dev_info(dev->dev,
128 "found bridge on endpoint %d\n", i);
129 bridge = tmp_bridge;
130 }
131
132 i++;
133 }
134
135 /*
136 * If we can't find neither panel nor bridge on any of the
137 * endpoints, and any of them retured -EPROBE_DEFER, then
138 * let's defer this driver too.
139 */
140 if ((!panel && !bridge) && defer)
141 return -EPROBE_DEFER;
142
143 if (panel) {
144 bridge = drm_panel_bridge_add_typed(panel,
145 DRM_MODE_CONNECTOR_Unknown);
146 if (IS_ERR(bridge)) {
147 ret = PTR_ERR(bridge);
148 goto finish;
149 }
150 } else if (bridge) {
151 dev_info(dev->dev, "Using non-panel bridge\n");
152 } else {
153 dev_err(dev->dev, "No bridge, exiting\n");
154 return -ENODEV;
155 }
156
157 priv->bridge = bridge;
158 if (panel) {
159 priv->panel = panel;
160 priv->connector = drm_panel_bridge_connector(bridge);
161 }
162
163 ret = pl111_display_init(dev);
164 if (ret != 0) {
165 dev_err(dev->dev, "Failed to init display\n");
166 goto out_bridge;
167 }
168
169 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
170 bridge);
171 if (ret)
172 return ret;
173
174 if (!priv->variant->broken_vblank) {
175 ret = drm_vblank_init(dev, 1);
176 if (ret != 0) {
177 dev_err(dev->dev, "Failed to init vblank\n");
178 goto out_bridge;
179 }
180 }
181
182 drm_mode_config_reset(dev);
183
184 drm_kms_helper_poll_init(dev);
185
186 goto finish;
187
188out_bridge:
189 if (panel)
190 drm_panel_bridge_remove(bridge);
191finish:
192 return ret;
193}
194
195static struct drm_gem_object *
196pl111_gem_import_sg_table(struct drm_device *dev,
197 struct dma_buf_attachment *attach,
198 struct sg_table *sgt)
199{
200 struct pl111_drm_dev_private *priv = dev->dev_private;
201
202 /*
203 * When using device-specific reserved memory we can't import
204 * DMA buffers: those are passed by reference in any global
205 * memory and we can only handle a specific range of memory.
206 */
207 if (priv->use_device_memory)
208 return ERR_PTR(-EINVAL);
209
210 return drm_gem_dma_prime_import_sg_table(dev, attach, sgt);
211}
212
213DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
214
215static const struct drm_driver pl111_drm_driver = {
216 .driver_features =
217 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
218 .ioctls = NULL,
219 .fops = &drm_fops,
220 .name = "pl111",
221 .desc = DRIVER_DESC,
222 .date = "20170317",
223 .major = 1,
224 .minor = 0,
225 .patchlevel = 0,
226 .dumb_create = drm_gem_dma_dumb_create,
227 .gem_prime_import_sg_table = pl111_gem_import_sg_table,
228
229#if defined(CONFIG_DEBUG_FS)
230 .debugfs_init = pl111_debugfs_init,
231#endif
232};
233
234static int pl111_amba_probe(struct amba_device *amba_dev,
235 const struct amba_id *id)
236{
237 struct device *dev = &amba_dev->dev;
238 struct pl111_drm_dev_private *priv;
239 const struct pl111_variant_data *variant = id->data;
240 struct drm_device *drm;
241 int ret;
242
243 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
244 if (!priv)
245 return -ENOMEM;
246
247 drm = drm_dev_alloc(&pl111_drm_driver, dev);
248 if (IS_ERR(drm))
249 return PTR_ERR(drm);
250 amba_set_drvdata(amba_dev, drm);
251 priv->drm = drm;
252 drm->dev_private = priv;
253 priv->variant = variant;
254
255 ret = of_reserved_mem_device_init(dev);
256 if (!ret) {
257 dev_info(dev, "using device-specific reserved memory\n");
258 priv->use_device_memory = true;
259 }
260
261 if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
262 &priv->memory_bw)) {
263 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
264 priv->memory_bw = 0;
265 }
266
267 /* The two main variants swap this register */
268 if (variant->is_pl110 || variant->is_lcdc) {
269 priv->ienb = CLCD_PL110_IENB;
270 priv->ctrl = CLCD_PL110_CNTL;
271 } else {
272 priv->ienb = CLCD_PL111_IENB;
273 priv->ctrl = CLCD_PL111_CNTL;
274 }
275
276 priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
277 if (IS_ERR(priv->regs)) {
278 dev_err(dev, "%s failed mmio\n", __func__);
279 ret = PTR_ERR(priv->regs);
280 goto dev_put;
281 }
282
283 /* This may override some variant settings */
284 ret = pl111_versatile_init(dev, priv);
285 if (ret)
286 goto dev_put;
287
288 pl111_nomadik_init(dev);
289
290 /* turn off interrupts before requesting the irq */
291 writel(0, priv->regs + priv->ienb);
292
293 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
294 variant->name, priv);
295 if (ret != 0) {
296 dev_err(dev, "%s failed irq %d\n", __func__, ret);
297 return ret;
298 }
299
300 ret = pl111_modeset_init(drm);
301 if (ret != 0)
302 goto dev_put;
303
304 ret = drm_dev_register(drm, 0);
305 if (ret < 0)
306 goto dev_put;
307
308 drm_fbdev_dma_setup(drm, priv->variant->fb_depth);
309
310 return 0;
311
312dev_put:
313 drm_dev_put(drm);
314 of_reserved_mem_device_release(dev);
315
316 return ret;
317}
318
319static void pl111_amba_remove(struct amba_device *amba_dev)
320{
321 struct device *dev = &amba_dev->dev;
322 struct drm_device *drm = amba_get_drvdata(amba_dev);
323 struct pl111_drm_dev_private *priv = drm->dev_private;
324
325 drm_dev_unregister(drm);
326 drm_atomic_helper_shutdown(drm);
327 if (priv->panel)
328 drm_panel_bridge_remove(priv->bridge);
329 drm_dev_put(drm);
330 of_reserved_mem_device_release(dev);
331}
332
333static void pl111_amba_shutdown(struct amba_device *amba_dev)
334{
335 drm_atomic_helper_shutdown(amba_get_drvdata(amba_dev));
336}
337
338/*
339 * This early variant lacks the 565 and 444 pixel formats.
340 */
341static const u32 pl110_pixel_formats[] = {
342 DRM_FORMAT_ABGR8888,
343 DRM_FORMAT_XBGR8888,
344 DRM_FORMAT_ARGB8888,
345 DRM_FORMAT_XRGB8888,
346 DRM_FORMAT_ABGR1555,
347 DRM_FORMAT_XBGR1555,
348 DRM_FORMAT_ARGB1555,
349 DRM_FORMAT_XRGB1555,
350};
351
352static const struct pl111_variant_data pl110_variant = {
353 .name = "PL110",
354 .is_pl110 = true,
355 .formats = pl110_pixel_formats,
356 .nformats = ARRAY_SIZE(pl110_pixel_formats),
357 .fb_depth = 16,
358};
359
360/* RealView, Versatile Express etc use this modern variant */
361static const u32 pl111_pixel_formats[] = {
362 DRM_FORMAT_ABGR8888,
363 DRM_FORMAT_XBGR8888,
364 DRM_FORMAT_ARGB8888,
365 DRM_FORMAT_XRGB8888,
366 DRM_FORMAT_BGR565,
367 DRM_FORMAT_RGB565,
368 DRM_FORMAT_ABGR1555,
369 DRM_FORMAT_XBGR1555,
370 DRM_FORMAT_ARGB1555,
371 DRM_FORMAT_XRGB1555,
372 DRM_FORMAT_ABGR4444,
373 DRM_FORMAT_XBGR4444,
374 DRM_FORMAT_ARGB4444,
375 DRM_FORMAT_XRGB4444,
376};
377
378static const struct pl111_variant_data pl111_variant = {
379 .name = "PL111",
380 .formats = pl111_pixel_formats,
381 .nformats = ARRAY_SIZE(pl111_pixel_formats),
382 .fb_depth = 32,
383};
384
385static const u32 pl110_nomadik_pixel_formats[] = {
386 DRM_FORMAT_RGB888,
387 DRM_FORMAT_BGR888,
388 DRM_FORMAT_ABGR8888,
389 DRM_FORMAT_XBGR8888,
390 DRM_FORMAT_ARGB8888,
391 DRM_FORMAT_XRGB8888,
392 DRM_FORMAT_BGR565,
393 DRM_FORMAT_RGB565,
394 DRM_FORMAT_ABGR1555,
395 DRM_FORMAT_XBGR1555,
396 DRM_FORMAT_ARGB1555,
397 DRM_FORMAT_XRGB1555,
398 DRM_FORMAT_ABGR4444,
399 DRM_FORMAT_XBGR4444,
400 DRM_FORMAT_ARGB4444,
401 DRM_FORMAT_XRGB4444,
402};
403
404static const struct pl111_variant_data pl110_nomadik_variant = {
405 .name = "LCDC (PL110 Nomadik)",
406 .formats = pl110_nomadik_pixel_formats,
407 .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
408 .is_lcdc = true,
409 .st_bitmux_control = true,
410 .broken_vblank = true,
411 .fb_depth = 16,
412};
413
414static const struct amba_id pl111_id_table[] = {
415 {
416 .id = 0x00041110,
417 .mask = 0x000fffff,
418 .data = (void *)&pl110_variant,
419 },
420 {
421 .id = 0x00180110,
422 .mask = 0x00fffffe,
423 .data = (void *)&pl110_nomadik_variant,
424 },
425 {
426 .id = 0x00041111,
427 .mask = 0x000fffff,
428 .data = (void *)&pl111_variant,
429 },
430 {0, 0},
431};
432MODULE_DEVICE_TABLE(amba, pl111_id_table);
433
434static struct amba_driver pl111_amba_driver __maybe_unused = {
435 .drv = {
436 .name = "drm-clcd-pl111",
437 },
438 .probe = pl111_amba_probe,
439 .remove = pl111_amba_remove,
440 .shutdown = pl111_amba_shutdown,
441 .id_table = pl111_id_table,
442};
443
444#ifdef CONFIG_ARM_AMBA
445module_amba_driver(pl111_amba_driver);
446#endif
447
448MODULE_DESCRIPTION(DRIVER_DESC);
449MODULE_AUTHOR("ARM Ltd.");
450MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
4 *
5 * Parts of this file were based on sources as follows:
6 *
7 * Copyright (c) 2006-2008 Intel Corporation
8 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
9 * Copyright (C) 2011 Texas Instruments
10 */
11
12/**
13 * DOC: ARM PrimeCell PL111 CLCD Driver
14 *
15 * The PL111 is a simple LCD controller that can support TFT and STN
16 * displays. This driver exposes a standard KMS interface for them.
17 *
18 * This driver uses the same Device Tree binding as the fbdev CLCD
19 * driver. While the fbdev driver supports panels that may be
20 * connected to the CLCD internally to the CLCD driver, in DRM the
21 * panels get split out to drivers/gpu/drm/panels/. This means that,
22 * in converting from using fbdev to using DRM, you also need to write
23 * a panel driver (which may be as simple as an entry in
24 * panel-simple.c).
25 *
26 * The driver currently doesn't expose the cursor. The DRM API for
27 * cursors requires support for 64x64 ARGB8888 cursor images, while
28 * the hardware can only support 64x64 monochrome with masking
29 * cursors. While one could imagine trying to hack something together
30 * to look at the ARGB8888 and program reasonable in monochrome, we
31 * just don't expose the cursor at all instead, and leave cursor
32 * support to the X11 software cursor layer.
33 *
34 * TODO:
35 *
36 * - Fix race between setting plane base address and getting IRQ for
37 * vsync firing the pageflip completion.
38 *
39 * - Use the "max-memory-bandwidth" DT property to filter the
40 * supported formats.
41 *
42 * - Read back hardware state at boot to skip reprogramming the
43 * hardware when doing a no-op modeset.
44 *
45 * - Use the CLKSEL bit to support switching between the two external
46 * clock parents.
47 */
48
49#include <linux/amba/bus.h>
50#include <linux/dma-buf.h>
51#include <linux/module.h>
52#include <linux/of.h>
53#include <linux/of_graph.h>
54#include <linux/of_reserved_mem.h>
55#include <linux/shmem_fs.h>
56#include <linux/slab.h>
57#include <linux/version.h>
58
59#include <drm/drm_atomic_helper.h>
60#include <drm/drm_bridge.h>
61#include <drm/drm_drv.h>
62#include <drm/drm_fb_cma_helper.h>
63#include <drm/drm_fb_helper.h>
64#include <drm/drm_gem_cma_helper.h>
65#include <drm/drm_gem_framebuffer_helper.h>
66#include <drm/drm_of.h>
67#include <drm/drm_panel.h>
68#include <drm/drm_probe_helper.h>
69#include <drm/drm_vblank.h>
70
71#include "pl111_drm.h"
72#include "pl111_versatile.h"
73#include "pl111_nomadik.h"
74
75#define DRIVER_DESC "DRM module for PL111"
76
77static 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
83static 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 device_node *np = dev->dev->of_node;
88 struct device_node *remote;
89 struct drm_panel *panel = NULL;
90 struct drm_bridge *bridge = NULL;
91 bool defer = false;
92 int ret;
93 int i;
94
95 ret = drmm_mode_config_init(dev);
96 if (ret)
97 return ret;
98
99 mode_config = &dev->mode_config;
100 mode_config->funcs = &mode_config_funcs;
101 mode_config->min_width = 1;
102 mode_config->max_width = 1024;
103 mode_config->min_height = 1;
104 mode_config->max_height = 768;
105
106 i = 0;
107 for_each_endpoint_of_node(np, remote) {
108 struct drm_panel *tmp_panel;
109 struct drm_bridge *tmp_bridge;
110
111 dev_dbg(dev->dev, "checking endpoint %d\n", i);
112
113 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
114 0, i,
115 &tmp_panel,
116 &tmp_bridge);
117 if (ret) {
118 if (ret == -EPROBE_DEFER) {
119 /*
120 * Something deferred, but that is often just
121 * another way of saying -ENODEV, but let's
122 * cast a vote for later deferral.
123 */
124 defer = true;
125 } else if (ret != -ENODEV) {
126 /* Continue, maybe something else is working */
127 dev_err(dev->dev,
128 "endpoint %d returns %d\n", i, ret);
129 }
130 }
131
132 if (tmp_panel) {
133 dev_info(dev->dev,
134 "found panel on endpoint %d\n", i);
135 panel = tmp_panel;
136 }
137 if (tmp_bridge) {
138 dev_info(dev->dev,
139 "found bridge on endpoint %d\n", i);
140 bridge = tmp_bridge;
141 }
142
143 i++;
144 }
145
146 /*
147 * If we can't find neither panel nor bridge on any of the
148 * endpoints, and any of them retured -EPROBE_DEFER, then
149 * let's defer this driver too.
150 */
151 if ((!panel && !bridge) && defer)
152 return -EPROBE_DEFER;
153
154 if (panel) {
155 bridge = drm_panel_bridge_add_typed(panel,
156 DRM_MODE_CONNECTOR_Unknown);
157 if (IS_ERR(bridge)) {
158 ret = PTR_ERR(bridge);
159 goto finish;
160 }
161 } else if (bridge) {
162 dev_info(dev->dev, "Using non-panel bridge\n");
163 } else {
164 dev_err(dev->dev, "No bridge, exiting\n");
165 return -ENODEV;
166 }
167
168 priv->bridge = bridge;
169 if (panel) {
170 priv->panel = panel;
171 priv->connector = drm_panel_bridge_connector(bridge);
172 }
173
174 ret = pl111_display_init(dev);
175 if (ret != 0) {
176 dev_err(dev->dev, "Failed to init display\n");
177 goto out_bridge;
178 }
179
180 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
181 bridge);
182 if (ret)
183 return ret;
184
185 if (!priv->variant->broken_vblank) {
186 ret = drm_vblank_init(dev, 1);
187 if (ret != 0) {
188 dev_err(dev->dev, "Failed to init vblank\n");
189 goto out_bridge;
190 }
191 }
192
193 drm_mode_config_reset(dev);
194
195 drm_kms_helper_poll_init(dev);
196
197 goto finish;
198
199out_bridge:
200 if (panel)
201 drm_panel_bridge_remove(bridge);
202finish:
203 return ret;
204}
205
206static struct drm_gem_object *
207pl111_gem_import_sg_table(struct drm_device *dev,
208 struct dma_buf_attachment *attach,
209 struct sg_table *sgt)
210{
211 struct pl111_drm_dev_private *priv = dev->dev_private;
212
213 /*
214 * When using device-specific reserved memory we can't import
215 * DMA buffers: those are passed by reference in any global
216 * memory and we can only handle a specific range of memory.
217 */
218 if (priv->use_device_memory)
219 return ERR_PTR(-EINVAL);
220
221 return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
222}
223
224DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
225
226static struct drm_driver pl111_drm_driver = {
227 .driver_features =
228 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
229 .ioctls = NULL,
230 .fops = &drm_fops,
231 .name = "pl111",
232 .desc = DRIVER_DESC,
233 .date = "20170317",
234 .major = 1,
235 .minor = 0,
236 .patchlevel = 0,
237 .dumb_create = drm_gem_cma_dumb_create,
238 .gem_free_object_unlocked = drm_gem_cma_free_object,
239 .gem_vm_ops = &drm_gem_cma_vm_ops,
240 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
241 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
242 .gem_prime_import_sg_table = pl111_gem_import_sg_table,
243 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
244 .gem_prime_mmap = drm_gem_cma_prime_mmap,
245 .gem_prime_vmap = drm_gem_cma_prime_vmap,
246
247#if defined(CONFIG_DEBUG_FS)
248 .debugfs_init = pl111_debugfs_init,
249#endif
250};
251
252static int pl111_amba_probe(struct amba_device *amba_dev,
253 const struct amba_id *id)
254{
255 struct device *dev = &amba_dev->dev;
256 struct pl111_drm_dev_private *priv;
257 const struct pl111_variant_data *variant = id->data;
258 struct drm_device *drm;
259 int ret;
260
261 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
262 if (!priv)
263 return -ENOMEM;
264
265 drm = drm_dev_alloc(&pl111_drm_driver, dev);
266 if (IS_ERR(drm))
267 return PTR_ERR(drm);
268 amba_set_drvdata(amba_dev, drm);
269 priv->drm = drm;
270 drm->dev_private = priv;
271 priv->variant = variant;
272
273 ret = of_reserved_mem_device_init(dev);
274 if (!ret) {
275 dev_info(dev, "using device-specific reserved memory\n");
276 priv->use_device_memory = true;
277 }
278
279 if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
280 &priv->memory_bw)) {
281 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
282 priv->memory_bw = 0;
283 }
284
285 /* The two main variants swap this register */
286 if (variant->is_pl110 || variant->is_lcdc) {
287 priv->ienb = CLCD_PL110_IENB;
288 priv->ctrl = CLCD_PL110_CNTL;
289 } else {
290 priv->ienb = CLCD_PL111_IENB;
291 priv->ctrl = CLCD_PL111_CNTL;
292 }
293
294 priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
295 if (IS_ERR(priv->regs)) {
296 dev_err(dev, "%s failed mmio\n", __func__);
297 ret = PTR_ERR(priv->regs);
298 goto dev_put;
299 }
300
301 /* This may override some variant settings */
302 ret = pl111_versatile_init(dev, priv);
303 if (ret)
304 goto dev_put;
305
306 pl111_nomadik_init(dev);
307
308 /* turn off interrupts before requesting the irq */
309 writel(0, priv->regs + priv->ienb);
310
311 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
312 variant->name, priv);
313 if (ret != 0) {
314 dev_err(dev, "%s failed irq %d\n", __func__, ret);
315 return ret;
316 }
317
318 ret = pl111_modeset_init(drm);
319 if (ret != 0)
320 goto dev_put;
321
322 ret = drm_dev_register(drm, 0);
323 if (ret < 0)
324 goto dev_put;
325
326 drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);
327
328 return 0;
329
330dev_put:
331 drm_dev_put(drm);
332 of_reserved_mem_device_release(dev);
333
334 return ret;
335}
336
337static int pl111_amba_remove(struct amba_device *amba_dev)
338{
339 struct device *dev = &amba_dev->dev;
340 struct drm_device *drm = amba_get_drvdata(amba_dev);
341 struct pl111_drm_dev_private *priv = drm->dev_private;
342
343 drm_dev_unregister(drm);
344 if (priv->panel)
345 drm_panel_bridge_remove(priv->bridge);
346 drm_dev_put(drm);
347 of_reserved_mem_device_release(dev);
348
349 return 0;
350}
351
352/*
353 * This early variant lacks the 565 and 444 pixel formats.
354 */
355static const u32 pl110_pixel_formats[] = {
356 DRM_FORMAT_ABGR8888,
357 DRM_FORMAT_XBGR8888,
358 DRM_FORMAT_ARGB8888,
359 DRM_FORMAT_XRGB8888,
360 DRM_FORMAT_ABGR1555,
361 DRM_FORMAT_XBGR1555,
362 DRM_FORMAT_ARGB1555,
363 DRM_FORMAT_XRGB1555,
364};
365
366static const struct pl111_variant_data pl110_variant = {
367 .name = "PL110",
368 .is_pl110 = true,
369 .formats = pl110_pixel_formats,
370 .nformats = ARRAY_SIZE(pl110_pixel_formats),
371 .fb_bpp = 16,
372};
373
374/* RealView, Versatile Express etc use this modern variant */
375static const u32 pl111_pixel_formats[] = {
376 DRM_FORMAT_ABGR8888,
377 DRM_FORMAT_XBGR8888,
378 DRM_FORMAT_ARGB8888,
379 DRM_FORMAT_XRGB8888,
380 DRM_FORMAT_BGR565,
381 DRM_FORMAT_RGB565,
382 DRM_FORMAT_ABGR1555,
383 DRM_FORMAT_XBGR1555,
384 DRM_FORMAT_ARGB1555,
385 DRM_FORMAT_XRGB1555,
386 DRM_FORMAT_ABGR4444,
387 DRM_FORMAT_XBGR4444,
388 DRM_FORMAT_ARGB4444,
389 DRM_FORMAT_XRGB4444,
390};
391
392static const struct pl111_variant_data pl111_variant = {
393 .name = "PL111",
394 .formats = pl111_pixel_formats,
395 .nformats = ARRAY_SIZE(pl111_pixel_formats),
396 .fb_bpp = 32,
397};
398
399static const u32 pl110_nomadik_pixel_formats[] = {
400 DRM_FORMAT_RGB888,
401 DRM_FORMAT_BGR888,
402 DRM_FORMAT_ABGR8888,
403 DRM_FORMAT_XBGR8888,
404 DRM_FORMAT_ARGB8888,
405 DRM_FORMAT_XRGB8888,
406 DRM_FORMAT_BGR565,
407 DRM_FORMAT_RGB565,
408 DRM_FORMAT_ABGR1555,
409 DRM_FORMAT_XBGR1555,
410 DRM_FORMAT_ARGB1555,
411 DRM_FORMAT_XRGB1555,
412 DRM_FORMAT_ABGR4444,
413 DRM_FORMAT_XBGR4444,
414 DRM_FORMAT_ARGB4444,
415 DRM_FORMAT_XRGB4444,
416};
417
418static const struct pl111_variant_data pl110_nomadik_variant = {
419 .name = "LCDC (PL110 Nomadik)",
420 .formats = pl110_nomadik_pixel_formats,
421 .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
422 .is_lcdc = true,
423 .st_bitmux_control = true,
424 .broken_vblank = true,
425 .fb_bpp = 16,
426};
427
428static const struct amba_id pl111_id_table[] = {
429 {
430 .id = 0x00041110,
431 .mask = 0x000fffff,
432 .data = (void *)&pl110_variant,
433 },
434 {
435 .id = 0x00180110,
436 .mask = 0x00fffffe,
437 .data = (void *)&pl110_nomadik_variant,
438 },
439 {
440 .id = 0x00041111,
441 .mask = 0x000fffff,
442 .data = (void *)&pl111_variant,
443 },
444 {0, 0},
445};
446MODULE_DEVICE_TABLE(amba, pl111_id_table);
447
448static struct amba_driver pl111_amba_driver __maybe_unused = {
449 .drv = {
450 .name = "drm-clcd-pl111",
451 },
452 .probe = pl111_amba_probe,
453 .remove = pl111_amba_remove,
454 .id_table = pl111_id_table,
455};
456
457#ifdef CONFIG_ARM_AMBA
458module_amba_driver(pl111_amba_driver);
459#endif
460
461MODULE_DESCRIPTION(DRIVER_DESC);
462MODULE_AUTHOR("ARM Ltd.");
463MODULE_LICENSE("GPL");