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

source code of linux/drivers/gpu/drm/arm/display/komeda/komeda_dev.c