1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
5 *
6 */
7#include <linux/io.h>
8#include <linux/iommu.h>
9#include <linux/of.h>
10#include <linux/of_graph.h>
11#include <linux/of_reserved_mem.h>
12#include <linux/platform_device.h>
13#include <linux/pm_runtime.h>
14#include <linux/dma-mapping.h>
15#ifdef CONFIG_DEBUG_FS
16#include <linux/debugfs.h>
17#include <linux/seq_file.h>
18#endif
19
20#include <drm/drm_print.h>
21
22#include "komeda_dev.h"
23
24static int komeda_register_show(struct seq_file *sf, void *x)
25{
26	struct komeda_dev *mdev = sf->private;
27	int i;
28
29	seq_puts(sf, "\n====== Komeda register dump =========\n");
30
31	pm_runtime_get_sync(mdev->dev);
32
33	if (mdev->funcs->dump_register)
34		mdev->funcs->dump_register(mdev, sf);
35
36	for (i = 0; i < mdev->n_pipelines; i++)
37		komeda_pipeline_dump_register(mdev->pipelines[i], sf);
38
39	pm_runtime_put(mdev->dev);
40
41	return 0;
42}
43
44DEFINE_SHOW_ATTRIBUTE(komeda_register);
45
46#ifdef CONFIG_DEBUG_FS
47static void komeda_debugfs_init(struct komeda_dev *mdev)
48{
49	if (!debugfs_initialized())
50		return;
51
52	mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
53	debugfs_create_file("register", 0444, mdev->debugfs_root,
54			    mdev, &komeda_register_fops);
55	debugfs_create_x16("err_verbosity", 0664, mdev->debugfs_root,
56			   &mdev->err_verbosity);
57}
58#endif
59
60static ssize_t
61core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
62{
63	struct komeda_dev *mdev = dev_to_mdev(dev);
64
65	return sysfs_emit(buf, "0x%08x\n", mdev->chip.core_id);
66}
67static DEVICE_ATTR_RO(core_id);
68
69static ssize_t
70config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
71{
72	struct komeda_dev *mdev = dev_to_mdev(dev);
73	struct komeda_pipeline *pipe = mdev->pipelines[0];
74	union komeda_config_id config_id;
75	int i;
76
77	memset(&config_id, 0, sizeof(config_id));
78
79	config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
80	config_id.n_pipelines = mdev->n_pipelines;
81	config_id.n_scalers = pipe->n_scalers;
82	config_id.n_layers = pipe->n_layers;
83	config_id.n_richs = 0;
84	for (i = 0; i < pipe->n_layers; i++) {
85		if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
86			config_id.n_richs++;
87	}
88	return sysfs_emit(buf, "0x%08x\n", config_id.value);
89}
90static DEVICE_ATTR_RO(config_id);
91
92static ssize_t
93aclk_hz_show(struct device *dev, struct device_attribute *attr, char *buf)
94{
95	struct komeda_dev *mdev = dev_to_mdev(dev);
96
97	return sysfs_emit(buf, "%lu\n", clk_get_rate(mdev->aclk));
98}
99static DEVICE_ATTR_RO(aclk_hz);
100
101static struct attribute *komeda_sysfs_entries[] = {
102	&dev_attr_core_id.attr,
103	&dev_attr_config_id.attr,
104	&dev_attr_aclk_hz.attr,
105	NULL,
106};
107
108static struct attribute_group komeda_sysfs_attr_group = {
109	.attrs = komeda_sysfs_entries,
110};
111
112static int komeda_parse_pipe_dt(struct komeda_pipeline *pipe)
113{
114	struct device_node *np = pipe->of_node;
115	struct clk *clk;
116
117	clk = of_clk_get_by_name(np, "pxclk");
118	if (IS_ERR(clk)) {
119		DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe->id);
120		return PTR_ERR(clk);
121	}
122	pipe->pxlclk = clk;
123
124	/* enum ports */
125	pipe->of_output_links[0] =
126		of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
127	pipe->of_output_links[1] =
128		of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 1);
129	pipe->of_output_port =
130		of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
131
132	pipe->dual_link = pipe->of_output_links[0] && pipe->of_output_links[1];
133
134	return 0;
135}
136
137static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
138{
139	struct platform_device *pdev = to_platform_device(dev);
140	struct device_node *child, *np = dev->of_node;
141	struct komeda_pipeline *pipe;
142	u32 pipe_id = U32_MAX;
143	int ret = -1;
144
145	mdev->irq  = platform_get_irq(pdev, 0);
146	if (mdev->irq < 0) {
147		DRM_ERROR("could not get IRQ number.\n");
148		return mdev->irq;
149	}
150
151	/* Get the optional framebuffer memory resource */
152	ret = of_reserved_mem_device_init(dev);
153	if (ret && ret != -ENODEV)
154		return ret;
155
156	for_each_available_child_of_node(np, child) {
157		if (of_node_name_eq(child, "pipeline")) {
158			of_property_read_u32(child, "reg", &pipe_id);
159			if (pipe_id >= mdev->n_pipelines) {
160				DRM_WARN("Skip the redundant DT node: pipeline-%u.\n",
161					 pipe_id);
162				continue;
163			}
164			mdev->pipelines[pipe_id]->of_node = of_node_get(child);
165		}
166	}
167
168	for (pipe_id = 0; pipe_id < mdev->n_pipelines; pipe_id++) {
169		pipe = mdev->pipelines[pipe_id];
170
171		if (!pipe->of_node) {
172			DRM_ERROR("Pipeline-%d doesn't have a DT node.\n",
173				  pipe->id);
174			return -EINVAL;
175		}
176		ret = komeda_parse_pipe_dt(pipe);
177		if (ret)
178			return ret;
179	}
180
181	return 0;
182}
183
184struct komeda_dev *komeda_dev_create(struct device *dev)
185{
186	struct platform_device *pdev = to_platform_device(dev);
187	komeda_identify_func komeda_identify;
188	struct komeda_dev *mdev;
189	int err = 0;
190
191	komeda_identify = of_device_get_match_data(dev);
192	if (!komeda_identify)
193		return ERR_PTR(-ENODEV);
194
195	mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
196	if (!mdev)
197		return ERR_PTR(-ENOMEM);
198
199	mutex_init(&mdev->lock);
200
201	mdev->dev = dev;
202	mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
203	if (IS_ERR(mdev->reg_base)) {
204		DRM_ERROR("Map register space failed.\n");
205		err = PTR_ERR(mdev->reg_base);
206		mdev->reg_base = NULL;
207		goto err_cleanup;
208	}
209
210	mdev->aclk = devm_clk_get(dev, "aclk");
211	if (IS_ERR(mdev->aclk)) {
212		DRM_ERROR("Get engine clk failed.\n");
213		err = PTR_ERR(mdev->aclk);
214		mdev->aclk = NULL;
215		goto err_cleanup;
216	}
217
218	clk_prepare_enable(mdev->aclk);
219
220	mdev->funcs = komeda_identify(mdev->reg_base, &mdev->chip);
221	if (!mdev->funcs) {
222		DRM_ERROR("Failed to identify the HW.\n");
223		err = -ENODEV;
224		goto disable_clk;
225	}
226
227	DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
228		 MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
229		 MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
230		 MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
231
232	mdev->funcs->init_format_table(mdev);
233
234	err = mdev->funcs->enum_resources(mdev);
235	if (err) {
236		DRM_ERROR("enumerate display resource failed.\n");
237		goto disable_clk;
238	}
239
240	err = komeda_parse_dt(dev, mdev);
241	if (err) {
242		DRM_ERROR("parse device tree failed.\n");
243		goto disable_clk;
244	}
245
246	err = komeda_assemble_pipelines(mdev);
247	if (err) {
248		DRM_ERROR("assemble display pipelines failed.\n");
249		goto disable_clk;
250	}
251
252	dma_set_max_seg_size(dev, U32_MAX);
253
254	mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
255	if (!mdev->iommu)
256		DRM_INFO("continue without IOMMU support!\n");
257
258	clk_disable_unprepare(mdev->aclk);
259
260	err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
261	if (err) {
262		DRM_ERROR("create sysfs group failed.\n");
263		goto err_cleanup;
264	}
265
266	mdev->err_verbosity = KOMEDA_DEV_PRINT_ERR_EVENTS;
267
268#ifdef CONFIG_DEBUG_FS
269	komeda_debugfs_init(mdev);
270#endif
271
272	return mdev;
273
274disable_clk:
275	clk_disable_unprepare(mdev->aclk);
276err_cleanup:
277	komeda_dev_destroy(mdev);
278	return ERR_PTR(err);
279}
280
281void komeda_dev_destroy(struct komeda_dev *mdev)
282{
283	struct device *dev = mdev->dev;
284	const struct komeda_dev_funcs *funcs = mdev->funcs;
285	int i;
286
287	sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
288
289#ifdef CONFIG_DEBUG_FS
290	debugfs_remove_recursive(mdev->debugfs_root);
291#endif
292
293	if (mdev->aclk)
294		clk_prepare_enable(mdev->aclk);
295
296	for (i = 0; i < mdev->n_pipelines; i++) {
297		komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
298		mdev->pipelines[i] = NULL;
299	}
300
301	mdev->n_pipelines = 0;
302
303	of_reserved_mem_device_release(dev);
304
305	if (funcs && funcs->cleanup)
306		funcs->cleanup(mdev);
307
308	if (mdev->reg_base) {
309		devm_iounmap(dev, mdev->reg_base);
310		mdev->reg_base = NULL;
311	}
312
313	if (mdev->aclk) {
314		clk_disable_unprepare(mdev->aclk);
315		devm_clk_put(dev, mdev->aclk);
316		mdev->aclk = NULL;
317	}
318
319	devm_kfree(dev, mdev);
320}
321
322int komeda_dev_resume(struct komeda_dev *mdev)
323{
324	clk_prepare_enable(mdev->aclk);
325
326	mdev->funcs->enable_irq(mdev);
327
328	if (mdev->iommu && mdev->funcs->connect_iommu)
329		if (mdev->funcs->connect_iommu(mdev))
330			DRM_ERROR("connect iommu failed.\n");
331
332	return 0;
333}
334
335int komeda_dev_suspend(struct komeda_dev *mdev)
336{
337	if (mdev->iommu && mdev->funcs->disconnect_iommu)
338		if (mdev->funcs->disconnect_iommu(mdev))
339			DRM_ERROR("disconnect iommu failed.\n");
340
341	mdev->funcs->disable_irq(mdev);
342
343	clk_disable_unprepare(mdev->aclk);
344
345	return 0;
346}
347