1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2012-2013, NVIDIA Corporation.
  4 */
  5
  6#include <linux/clk.h>
  7#include <linux/iommu.h>
  8#include <linux/module.h>
  9#include <linux/of_device.h>
 10
 11#include "drm.h"
 12#include "gem.h"
 13#include "gr2d.h"
 14
 15struct gr2d_soc {
 16	unsigned int version;
 17};
 18
 19struct gr2d {
 20	struct iommu_group *group;
 21	struct tegra_drm_client client;
 22	struct host1x_channel *channel;
 23	struct clk *clk;
 24
 25	const struct gr2d_soc *soc;
 26
 27	DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
 28};
 29
 30static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
 31{
 32	return container_of(client, struct gr2d, client);
 33}
 34
 35static int gr2d_init(struct host1x_client *client)
 36{
 37	struct tegra_drm_client *drm = host1x_to_drm_client(client);
 38	struct drm_device *dev = dev_get_drvdata(client->parent);
 39	unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
 40	struct gr2d *gr2d = to_gr2d(drm);
 41	int err;
 42
 43	gr2d->channel = host1x_channel_request(client->dev);
 44	if (!gr2d->channel)
 45		return -ENOMEM;
 46
 47	client->syncpts[0] = host1x_syncpt_request(client, flags);
 48	if (!client->syncpts[0]) {
 49		err = -ENOMEM;
 50		dev_err(client->dev, "failed to request syncpoint: %d\n", err);
 51		goto put;
 52	}
 53
 54	gr2d->group = host1x_client_iommu_attach(client, false);
 55	if (IS_ERR(gr2d->group)) {
 56		err = PTR_ERR(gr2d->group);
 57		dev_err(client->dev, "failed to attach to domain: %d\n", err);
 58		goto free;
 59	}
 60
 61	err = tegra_drm_register_client(dev->dev_private, drm);
 62	if (err < 0) {
 63		dev_err(client->dev, "failed to register client: %d\n", err);
 64		goto detach;
 65	}
 66
 67	return 0;
 68
 69detach:
 70	host1x_client_iommu_detach(client, gr2d->group);
 71free:
 72	host1x_syncpt_free(client->syncpts[0]);
 73put:
 74	host1x_channel_put(gr2d->channel);
 75	return err;
 76}
 77
 78static int gr2d_exit(struct host1x_client *client)
 79{
 80	struct tegra_drm_client *drm = host1x_to_drm_client(client);
 81	struct drm_device *dev = dev_get_drvdata(client->parent);
 82	struct tegra_drm *tegra = dev->dev_private;
 83	struct gr2d *gr2d = to_gr2d(drm);
 84	int err;
 85
 86	err = tegra_drm_unregister_client(tegra, drm);
 87	if (err < 0)
 88		return err;
 89
 90	host1x_client_iommu_detach(client, gr2d->group);
 91	host1x_syncpt_free(client->syncpts[0]);
 92	host1x_channel_put(gr2d->channel);
 93
 94	return 0;
 95}
 96
 97static const struct host1x_client_ops gr2d_client_ops = {
 98	.init = gr2d_init,
 99	.exit = gr2d_exit,
100};
101
102static int gr2d_open_channel(struct tegra_drm_client *client,
103			     struct tegra_drm_context *context)
104{
105	struct gr2d *gr2d = to_gr2d(client);
106
107	context->channel = host1x_channel_get(gr2d->channel);
108	if (!context->channel)
109		return -ENOMEM;
110
111	return 0;
112}
113
114static void gr2d_close_channel(struct tegra_drm_context *context)
115{
116	host1x_channel_put(context->channel);
117}
118
119static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
120{
121	struct gr2d *gr2d = dev_get_drvdata(dev);
122
123	switch (class) {
124	case HOST1X_CLASS_HOST1X:
125		if (offset == 0x2b)
126			return 1;
127
128		break;
129
130	case HOST1X_CLASS_GR2D:
131	case HOST1X_CLASS_GR2D_SB:
132		if (offset >= GR2D_NUM_REGS)
133			break;
134
135		if (test_bit(offset, gr2d->addr_regs))
136			return 1;
137
138		break;
139	}
140
141	return 0;
142}
143
144static int gr2d_is_valid_class(u32 class)
145{
146	return (class == HOST1X_CLASS_GR2D ||
147		class == HOST1X_CLASS_GR2D_SB);
148}
149
150static const struct tegra_drm_client_ops gr2d_ops = {
151	.open_channel = gr2d_open_channel,
152	.close_channel = gr2d_close_channel,
153	.is_addr_reg = gr2d_is_addr_reg,
154	.is_valid_class = gr2d_is_valid_class,
155	.submit = tegra_drm_submit,
156};
157
158static const struct gr2d_soc tegra20_gr2d_soc = {
159	.version = 0x20,
160};
161
162static const struct gr2d_soc tegra30_gr2d_soc = {
163	.version = 0x30,
164};
165
166static const struct of_device_id gr2d_match[] = {
167	{ .compatible = "nvidia,tegra30-gr2d", .data = &tegra20_gr2d_soc },
168	{ .compatible = "nvidia,tegra20-gr2d", .data = &tegra30_gr2d_soc },
169	{ },
170};
171MODULE_DEVICE_TABLE(of, gr2d_match);
172
173static const u32 gr2d_addr_regs[] = {
174	GR2D_UA_BASE_ADDR,
175	GR2D_VA_BASE_ADDR,
176	GR2D_PAT_BASE_ADDR,
177	GR2D_DSTA_BASE_ADDR,
178	GR2D_DSTB_BASE_ADDR,
179	GR2D_DSTC_BASE_ADDR,
180	GR2D_SRCA_BASE_ADDR,
181	GR2D_SRCB_BASE_ADDR,
182	GR2D_SRC_BASE_ADDR_SB,
183	GR2D_DSTA_BASE_ADDR_SB,
184	GR2D_DSTB_BASE_ADDR_SB,
185	GR2D_UA_BASE_ADDR_SB,
186	GR2D_VA_BASE_ADDR_SB,
187};
188
189static int gr2d_probe(struct platform_device *pdev)
190{
191	struct device *dev = &pdev->dev;
192	struct host1x_syncpt **syncpts;
193	struct gr2d *gr2d;
194	unsigned int i;
195	int err;
196
197	gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
198	if (!gr2d)
199		return -ENOMEM;
200
201	gr2d->soc = of_device_get_match_data(dev);
202
203	syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
204	if (!syncpts)
205		return -ENOMEM;
206
207	gr2d->clk = devm_clk_get(dev, NULL);
208	if (IS_ERR(gr2d->clk)) {
209		dev_err(dev, "cannot get clock\n");
210		return PTR_ERR(gr2d->clk);
211	}
212
213	err = clk_prepare_enable(gr2d->clk);
214	if (err) {
215		dev_err(dev, "cannot turn on clock\n");
216		return err;
217	}
218
219	INIT_LIST_HEAD(&gr2d->client.base.list);
220	gr2d->client.base.ops = &gr2d_client_ops;
221	gr2d->client.base.dev = dev;
222	gr2d->client.base.class = HOST1X_CLASS_GR2D;
223	gr2d->client.base.syncpts = syncpts;
224	gr2d->client.base.num_syncpts = 1;
225
226	INIT_LIST_HEAD(&gr2d->client.list);
227	gr2d->client.version = gr2d->soc->version;
228	gr2d->client.ops = &gr2d_ops;
229
230	err = host1x_client_register(&gr2d->client.base);
231	if (err < 0) {
232		dev_err(dev, "failed to register host1x client: %d\n", err);
233		clk_disable_unprepare(gr2d->clk);
234		return err;
235	}
236
237	/* initialize address register map */
238	for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
239		set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
240
241	platform_set_drvdata(pdev, gr2d);
242
243	return 0;
244}
245
246static int gr2d_remove(struct platform_device *pdev)
247{
248	struct gr2d *gr2d = platform_get_drvdata(pdev);
249	int err;
250
251	err = host1x_client_unregister(&gr2d->client.base);
252	if (err < 0) {
253		dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
254			err);
255		return err;
256	}
257
258	clk_disable_unprepare(gr2d->clk);
259
260	return 0;
261}
262
263struct platform_driver tegra_gr2d_driver = {
264	.driver = {
265		.name = "tegra-gr2d",
266		.of_match_table = gr2d_match,
267	},
268	.probe = gr2d_probe,
269	.remove = gr2d_remove,
270};