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/dma-mapping.h>
14 #ifdef CONFIG_DEBUG_FS
15 #include <linux/debugfs.h>
16 #include <linux/seq_file.h>
17 #endif
18 
19 #include <drm/drm_print.h>
20 
21 #include "komeda_dev.h"
22 
23 static int komeda_register_show(struct seq_file *sf, void *x)
24 {
25 	struct komeda_dev *mdev = sf->private;
26 	int i;
27 
28 	if (mdev->funcs->dump_register)
29 		mdev->funcs->dump_register(mdev, sf);
30 
31 	for (i = 0; i < mdev->n_pipelines; i++)
32 		komeda_pipeline_dump_register(mdev->pipelines[i], sf);
33 
34 	return 0;
35 }
36 
37 static int komeda_register_open(struct inode *inode, struct file *filp)
38 {
39 	return single_open(filp, komeda_register_show, inode->i_private);
40 }
41 
42 static const struct file_operations komeda_register_fops = {
43 	.owner		= THIS_MODULE,
44 	.open		= komeda_register_open,
45 	.read		= seq_read,
46 	.llseek		= seq_lseek,
47 	.release	= single_release,
48 };
49 
50 #ifdef CONFIG_DEBUG_FS
51 static void komeda_debugfs_init(struct komeda_dev *mdev)
52 {
53 	if (!debugfs_initialized())
54 		return;
55 
56 	mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
57 	debugfs_create_file("register", 0444, mdev->debugfs_root,
58 			    mdev, &komeda_register_fops);
59 }
60 #endif
61 
62 static ssize_t
63 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
64 {
65 	struct komeda_dev *mdev = dev_to_mdev(dev);
66 
67 	return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
68 }
69 static DEVICE_ATTR_RO(core_id);
70 
71 static ssize_t
72 config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
73 {
74 	struct komeda_dev *mdev = dev_to_mdev(dev);
75 	struct komeda_pipeline *pipe = mdev->pipelines[0];
76 	union komeda_config_id config_id;
77 	int i;
78 
79 	memset(&config_id, 0, sizeof(config_id));
80 
81 	config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
82 	config_id.n_pipelines = mdev->n_pipelines;
83 	config_id.n_scalers = pipe->n_scalers;
84 	config_id.n_layers = pipe->n_layers;
85 	config_id.n_richs = 0;
86 	for (i = 0; i < pipe->n_layers; i++) {
87 		if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
88 			config_id.n_richs++;
89 	}
90 	return snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
91 }
92 static DEVICE_ATTR_RO(config_id);
93 
94 static struct attribute *komeda_sysfs_entries[] = {
95 	&dev_attr_core_id.attr,
96 	&dev_attr_config_id.attr,
97 	NULL,
98 };
99 
100 static struct attribute_group komeda_sysfs_attr_group = {
101 	.attrs = komeda_sysfs_entries,
102 };
103 
104 static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_node *np)
105 {
106 	struct komeda_pipeline *pipe;
107 	struct clk *clk;
108 	u32 pipe_id;
109 	int ret = 0;
110 
111 	ret = of_property_read_u32(np, "reg", &pipe_id);
112 	if (ret != 0 || pipe_id >= mdev->n_pipelines)
113 		return -EINVAL;
114 
115 	pipe = mdev->pipelines[pipe_id];
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 	pipe->of_node = of_node_get(np);
134 
135 	return 0;
136 }
137 
138 static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
139 {
140 	struct platform_device *pdev = to_platform_device(dev);
141 	struct device_node *child, *np = dev->of_node;
142 	int ret;
143 
144 	mdev->irq  = platform_get_irq(pdev, 0);
145 	if (mdev->irq < 0) {
146 		DRM_ERROR("could not get IRQ number.\n");
147 		return mdev->irq;
148 	}
149 
150 	/* Get the optional framebuffer memory resource */
151 	ret = of_reserved_mem_device_init(dev);
152 	if (ret && ret != -ENODEV)
153 		return ret;
154 	ret = 0;
155 
156 	for_each_available_child_of_node(np, child) {
157 		if (of_node_cmp(child->name, "pipeline") == 0) {
158 			ret = komeda_parse_pipe_dt(mdev, child);
159 			if (ret) {
160 				DRM_ERROR("parse pipeline dt error!\n");
161 				of_node_put(child);
162 				break;
163 			}
164 		}
165 	}
166 
167 	return ret;
168 }
169 
170 struct komeda_dev *komeda_dev_create(struct device *dev)
171 {
172 	struct platform_device *pdev = to_platform_device(dev);
173 	const struct komeda_product_data *product;
174 	struct komeda_dev *mdev;
175 	struct resource *io_res;
176 	int err = 0;
177 
178 	product = of_device_get_match_data(dev);
179 	if (!product)
180 		return ERR_PTR(-ENODEV);
181 
182 	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
183 	if (!io_res) {
184 		DRM_ERROR("No registers defined.\n");
185 		return ERR_PTR(-ENODEV);
186 	}
187 
188 	mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
189 	if (!mdev)
190 		return ERR_PTR(-ENOMEM);
191 
192 	mutex_init(&mdev->lock);
193 
194 	mdev->dev = dev;
195 	mdev->reg_base = devm_ioremap_resource(dev, io_res);
196 	if (IS_ERR(mdev->reg_base)) {
197 		DRM_ERROR("Map register space failed.\n");
198 		err = PTR_ERR(mdev->reg_base);
199 		mdev->reg_base = NULL;
200 		goto err_cleanup;
201 	}
202 
203 	mdev->aclk = devm_clk_get(dev, "aclk");
204 	if (IS_ERR(mdev->aclk)) {
205 		DRM_ERROR("Get engine clk failed.\n");
206 		err = PTR_ERR(mdev->aclk);
207 		mdev->aclk = NULL;
208 		goto err_cleanup;
209 	}
210 
211 	clk_prepare_enable(mdev->aclk);
212 
213 	mdev->funcs = product->identify(mdev->reg_base, &mdev->chip);
214 	if (!komeda_product_match(mdev, product->product_id)) {
215 		DRM_ERROR("DT configured %x mismatch with real HW %x.\n",
216 			  product->product_id,
217 			  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id));
218 		err = -ENODEV;
219 		goto err_cleanup;
220 	}
221 
222 	DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
223 		 MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
224 		 MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
225 		 MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
226 
227 	mdev->funcs->init_format_table(mdev);
228 
229 	err = mdev->funcs->enum_resources(mdev);
230 	if (err) {
231 		DRM_ERROR("enumerate display resource failed.\n");
232 		goto err_cleanup;
233 	}
234 
235 	err = komeda_parse_dt(dev, mdev);
236 	if (err) {
237 		DRM_ERROR("parse device tree failed.\n");
238 		goto err_cleanup;
239 	}
240 
241 	err = komeda_assemble_pipelines(mdev);
242 	if (err) {
243 		DRM_ERROR("assemble display pipelines failed.\n");
244 		goto err_cleanup;
245 	}
246 
247 	dev->dma_parms = &mdev->dma_parms;
248 	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
249 
250 	mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
251 	if (!mdev->iommu)
252 		DRM_INFO("continue without IOMMU support!\n");
253 
254 	if (mdev->iommu && mdev->funcs->connect_iommu) {
255 		err = mdev->funcs->connect_iommu(mdev);
256 		if (err) {
257 			mdev->iommu = NULL;
258 			goto err_cleanup;
259 		}
260 	}
261 
262 	err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
263 	if (err) {
264 		DRM_ERROR("create sysfs group failed.\n");
265 		goto err_cleanup;
266 	}
267 
268 #ifdef CONFIG_DEBUG_FS
269 	komeda_debugfs_init(mdev);
270 #endif
271 
272 	return mdev;
273 
274 err_cleanup:
275 	komeda_dev_destroy(mdev);
276 	return ERR_PTR(err);
277 }
278 
279 void komeda_dev_destroy(struct komeda_dev *mdev)
280 {
281 	struct device *dev = mdev->dev;
282 	const struct komeda_dev_funcs *funcs = mdev->funcs;
283 	int i;
284 
285 	sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
286 
287 #ifdef CONFIG_DEBUG_FS
288 	debugfs_remove_recursive(mdev->debugfs_root);
289 #endif
290 
291 	if (mdev->iommu && mdev->funcs->disconnect_iommu)
292 		mdev->funcs->disconnect_iommu(mdev);
293 	mdev->iommu = NULL;
294 
295 	for (i = 0; i < mdev->n_pipelines; i++) {
296 		komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
297 		mdev->pipelines[i] = NULL;
298 	}
299 
300 	mdev->n_pipelines = 0;
301 
302 	of_reserved_mem_device_release(dev);
303 
304 	if (funcs && funcs->cleanup)
305 		funcs->cleanup(mdev);
306 
307 	if (mdev->reg_base) {
308 		devm_iounmap(dev, mdev->reg_base);
309 		mdev->reg_base = NULL;
310 	}
311 
312 	if (mdev->aclk) {
313 		clk_disable_unprepare(mdev->aclk);
314 		devm_clk_put(dev, mdev->aclk);
315 		mdev->aclk = NULL;
316 	}
317 
318 	devm_kfree(dev, mdev);
319 }
320