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
komeda_register_show(struct seq_file * sf,void * x)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
komeda_debugfs_init(struct komeda_dev * mdev)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
core_id_show(struct device * dev,struct device_attribute * attr,char * buf)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 sysfs_emit(buf, "0x%08x\n", mdev->chip.core_id);
66 }
67 static DEVICE_ATTR_RO(core_id);
68
69 static ssize_t
config_id_show(struct device * dev,struct device_attribute * attr,char * buf)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 sysfs_emit(buf, "0x%08x\n", config_id.value);
89 }
90 static DEVICE_ATTR_RO(config_id);
91
92 static ssize_t
aclk_hz_show(struct device * dev,struct device_attribute * attr,char * buf)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 sysfs_emit(buf, "%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
komeda_parse_pipe_dt(struct komeda_pipeline * pipe)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
komeda_parse_dt(struct device * dev,struct komeda_dev * mdev)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
komeda_dev_create(struct device * dev)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
komeda_dev_destroy(struct komeda_dev * mdev)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
komeda_dev_resume(struct komeda_dev * mdev)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
komeda_dev_suspend(struct komeda_dev * mdev)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