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(sf, "\n====== Komeda register dump =========\n");
 28
 29	pm_runtime_get_sync(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(mdev->pipelines[i], sf);
 36
 37	pm_runtime_put(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("komeda", NULL);
 50	debugfs_create_file("register", 0444, mdev->debugfs_root,
 51			    mdev, &komeda_register_fops);
 52	debugfs_create_x16("err_verbosity", 0664, mdev->debugfs_root,
 53			   &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, "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, "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, "%lu\n", clk_get_rate(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, "pxclk");
114	if (IS_ERR(clk)) {
115		DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe->id);
116		return PTR_ERR(clk);
117	}
118	pipe->pxlclk = clk;
119
120	/* enum ports */
121	pipe->of_output_links[0] =
122		of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
123	pipe->of_output_links[1] =
124		of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 1);
125	pipe->of_output_port =
126		of_graph_get_port_by_id(np, 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(child, "pipeline")) {
154			of_property_read_u32(child, "reg", &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(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(-ENODEV);
190
191	mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
192	if (!mdev)
193		return ERR_PTR(-ENOMEM);
194
195	mutex_init(&mdev->lock);
196
197	mdev->dev = dev;
198	mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
199	if (IS_ERR(mdev->reg_base)) {
200		DRM_ERROR("Map register space failed.\n");
201		err = PTR_ERR(mdev->reg_base);
202		mdev->reg_base = NULL;
203		goto err_cleanup;
204	}
205
206	mdev->aclk = devm_clk_get(dev, "aclk");
207	if (IS_ERR(mdev->aclk)) {
208		DRM_ERROR("Get engine clk failed.\n");
209		err = PTR_ERR(mdev->aclk);
210		mdev->aclk = NULL;
211		goto err_cleanup;
212	}
213
214	clk_prepare_enable(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(mdev->dev);
251	if (!mdev->iommu)
252		DRM_INFO("continue without IOMMU support!\n");
253
254	clk_disable_unprepare(mdev->aclk);
255
256	err = sysfs_create_group(&dev->kobj, &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(mdev->aclk);
270err_cleanup:
271	komeda_dev_destroy(mdev);
272	return ERR_PTR(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(&dev->kobj, &komeda_sysfs_attr_group);
282
283	debugfs_remove_recursive(mdev->debugfs_root);
284
285	if (mdev->aclk)
286		clk_prepare_enable(mdev->aclk);
287
288	for (i = 0; i < mdev->n_pipelines; i++) {
289		komeda_pipeline_destroy(mdev, 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, mdev->reg_base);
302		mdev->reg_base = NULL;
303	}
304
305	if (mdev->aclk) {
306		clk_disable_unprepare(mdev->aclk);
307		devm_clk_put(dev, mdev->aclk);
308		mdev->aclk = NULL;
309	}
310
311	devm_kfree(dev, mdev);
312}
313
314int komeda_dev_resume(struct komeda_dev *mdev)
315{
316	clk_prepare_enable(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(mdev->aclk);
336
337	return 0;
338}