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_device.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 
24 static 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 
44 DEFINE_SHOW_ATTRIBUTE(komeda_register);
45 
46 #ifdef CONFIG_DEBUG_FS
47 static 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 
60 static ssize_t
61 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
62 {
63 	struct komeda_dev *mdev = dev_to_mdev(dev);
64 
65 	return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
66 }
67 static DEVICE_ATTR_RO(core_id);
68 
69 static ssize_t
70 config_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 snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
89 }
90 static DEVICE_ATTR_RO(config_id);
91 
92 static ssize_t
93 aclk_hz_show(struct device *dev, struct device_attribute *attr, char *buf)
94 {
95 	struct komeda_dev *mdev = dev_to_mdev(dev);
96 
97 	return snprintf(buf, PAGE_SIZE, "%lu\n", clk_get_rate(mdev->aclk));
98 }
99 static DEVICE_ATTR_RO(aclk_hz);
100 
101 static 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 
108 static struct attribute_group komeda_sysfs_attr_group = {
109 	.attrs = komeda_sysfs_entries,
110 };
111 
112 static 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 
137 static 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 
184 struct 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 
274 disable_clk:
275 	clk_disable_unprepare(mdev->aclk);
276 err_cleanup:
277 	komeda_dev_destroy(mdev);
278 	return ERR_PTR(err);
279 }
280 
281 void 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 
322 int 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 
335 int 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