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
 23static 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
 37static int komeda_register_open(struct inode *inode, struct file *filp)
 38{
 39	return single_open(filp, komeda_register_show, inode->i_private);
 40}
 41
 42static 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
 51static 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
 62static ssize_t
 63core_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}
 69static DEVICE_ATTR_RO(core_id);
 70
 71static ssize_t
 72config_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}
 92static DEVICE_ATTR_RO(config_id);
 93
 94static struct attribute *komeda_sysfs_entries[] = {
 95	&dev_attr_core_id.attr,
 96	&dev_attr_config_id.attr,
 97	NULL,
 98};
 99
100static struct attribute_group komeda_sysfs_attr_group = {
101	.attrs = komeda_sysfs_entries,
102};
103
104static 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
138static 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
170struct 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
274err_cleanup:
275	komeda_dev_destroy(mdev);
276	return ERR_PTR(err);
277}
278
279void 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}