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 tegra_drm_client client;
 21	struct host1x_channel *channel;
 22	struct clk *clk;
 23
 24	const struct gr2d_soc *soc;
 25
 26	DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
 27};
 28
 29static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
 30{
 31	return container_of(client, struct gr2d, client);
 32}
 33
 34static int gr2d_init(struct host1x_client *client)
 35{
 36	struct tegra_drm_client *drm = host1x_to_drm_client(client);
 37	struct drm_device *dev = dev_get_drvdata(client->host);
 38	unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
 39	struct gr2d *gr2d = to_gr2d(drm);
 40	int err;
 41
 42	gr2d->channel = host1x_channel_request(client);
 43	if (!gr2d->channel)
 44		return -ENOMEM;
 45
 46	client->syncpts[0] = host1x_syncpt_request(client, flags);
 47	if (!client->syncpts[0]) {
 48		err = -ENOMEM;
 49		dev_err(client->dev, "failed to request syncpoint: %d\n", err);
 50		goto put;
 51	}
 52
 53	err = host1x_client_iommu_attach(client);
 54	if (err < 0) {
 55		dev_err(client->dev, "failed to attach to domain: %d\n", err);
 56		goto free;
 57	}
 58
 59	err = tegra_drm_register_client(dev->dev_private, drm);
 60	if (err < 0) {
 61		dev_err(client->dev, "failed to register client: %d\n", err);
 62		goto detach;
 63	}
 64
 65	return 0;
 66
 67detach:
 68	host1x_client_iommu_detach(client);
 69free:
 70	host1x_syncpt_free(client->syncpts[0]);
 71put:
 72	host1x_channel_put(gr2d->channel);
 73	return err;
 74}
 75
 76static int gr2d_exit(struct host1x_client *client)
 77{
 78	struct tegra_drm_client *drm = host1x_to_drm_client(client);
 79	struct drm_device *dev = dev_get_drvdata(client->host);
 80	struct tegra_drm *tegra = dev->dev_private;
 81	struct gr2d *gr2d = to_gr2d(drm);
 82	int err;
 83
 84	err = tegra_drm_unregister_client(tegra, drm);
 85	if (err < 0)
 86		return err;
 87
 88	host1x_client_iommu_detach(client);
 89	host1x_syncpt_free(client->syncpts[0]);
 90	host1x_channel_put(gr2d->channel);
 91
 92	return 0;
 93}
 94
 95static const struct host1x_client_ops gr2d_client_ops = {
 96	.init = gr2d_init,
 97	.exit = gr2d_exit,
 98};
 99
100static int gr2d_open_channel(struct tegra_drm_client *client,
101			     struct tegra_drm_context *context)
102{
103	struct gr2d *gr2d = to_gr2d(client);
104
105	context->channel = host1x_channel_get(gr2d->channel);
106	if (!context->channel)
107		return -ENOMEM;
108
109	return 0;
110}
111
112static void gr2d_close_channel(struct tegra_drm_context *context)
113{
114	host1x_channel_put(context->channel);
115}
116
117static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
118{
119	struct gr2d *gr2d = dev_get_drvdata(dev);
120
121	switch (class) {
122	case HOST1X_CLASS_HOST1X:
123		if (offset == 0x2b)
124			return 1;
125
126		break;
127
128	case HOST1X_CLASS_GR2D:
129	case HOST1X_CLASS_GR2D_SB:
130		if (offset >= GR2D_NUM_REGS)
131			break;
132
133		if (test_bit(offset, gr2d->addr_regs))
134			return 1;
135
136		break;
137	}
138
139	return 0;
140}
141
142static int gr2d_is_valid_class(u32 class)
143{
144	return (class == HOST1X_CLASS_GR2D ||
145		class == HOST1X_CLASS_GR2D_SB);
146}
147
148static const struct tegra_drm_client_ops gr2d_ops = {
149	.open_channel = gr2d_open_channel,
150	.close_channel = gr2d_close_channel,
151	.is_addr_reg = gr2d_is_addr_reg,
152	.is_valid_class = gr2d_is_valid_class,
153	.submit = tegra_drm_submit,
154};
155
156static const struct gr2d_soc tegra20_gr2d_soc = {
157	.version = 0x20,
158};
159
160static const struct gr2d_soc tegra30_gr2d_soc = {
161	.version = 0x30,
162};
163
164static const struct of_device_id gr2d_match[] = {
165	{ .compatible = "nvidia,tegra30-gr2d", .data = &tegra20_gr2d_soc },
166	{ .compatible = "nvidia,tegra20-gr2d", .data = &tegra30_gr2d_soc },
167	{ },
168};
169MODULE_DEVICE_TABLE(of, gr2d_match);
170
171static const u32 gr2d_addr_regs[] = {
172	GR2D_UA_BASE_ADDR,
173	GR2D_VA_BASE_ADDR,
174	GR2D_PAT_BASE_ADDR,
175	GR2D_DSTA_BASE_ADDR,
176	GR2D_DSTB_BASE_ADDR,
177	GR2D_DSTC_BASE_ADDR,
178	GR2D_SRCA_BASE_ADDR,
179	GR2D_SRCB_BASE_ADDR,
180	GR2D_PATBASE_ADDR,
181	GR2D_SRC_BASE_ADDR_SB,
182	GR2D_DSTA_BASE_ADDR_SB,
183	GR2D_DSTB_BASE_ADDR_SB,
184	GR2D_UA_BASE_ADDR_SB,
185	GR2D_VA_BASE_ADDR_SB,
186};
187
188static int gr2d_probe(struct platform_device *pdev)
189{
190	struct device *dev = &pdev->dev;
191	struct host1x_syncpt **syncpts;
192	struct gr2d *gr2d;
193	unsigned int i;
194	int err;
195
196	gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
197	if (!gr2d)
198		return -ENOMEM;
199
200	gr2d->soc = of_device_get_match_data(dev);
201
202	syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
203	if (!syncpts)
204		return -ENOMEM;
205
206	gr2d->clk = devm_clk_get(dev, NULL);
207	if (IS_ERR(gr2d->clk)) {
208		dev_err(dev, "cannot get clock\n");
209		return PTR_ERR(gr2d->clk);
210	}
211
212	err = clk_prepare_enable(gr2d->clk);
213	if (err) {
214		dev_err(dev, "cannot turn on clock\n");
215		return err;
216	}
217
218	INIT_LIST_HEAD(&gr2d->client.base.list);
219	gr2d->client.base.ops = &gr2d_client_ops;
220	gr2d->client.base.dev = dev;
221	gr2d->client.base.class = HOST1X_CLASS_GR2D;
222	gr2d->client.base.syncpts = syncpts;
223	gr2d->client.base.num_syncpts = 1;
224
225	INIT_LIST_HEAD(&gr2d->client.list);
226	gr2d->client.version = gr2d->soc->version;
227	gr2d->client.ops = &gr2d_ops;
228
229	err = host1x_client_register(&gr2d->client.base);
230	if (err < 0) {
231		dev_err(dev, "failed to register host1x client: %d\n", err);
232		clk_disable_unprepare(gr2d->clk);
233		return err;
234	}
235
236	/* initialize address register map */
237	for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
238		set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
239
240	platform_set_drvdata(pdev, gr2d);
241
242	return 0;
243}
244
245static int gr2d_remove(struct platform_device *pdev)
246{
247	struct gr2d *gr2d = platform_get_drvdata(pdev);
248	int err;
249
250	err = host1x_client_unregister(&gr2d->client.base);
251	if (err < 0) {
252		dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
253			err);
254		return err;
255	}
256
257	clk_disable_unprepare(gr2d->clk);
258
259	return 0;
260}
261
262struct platform_driver tegra_gr2d_driver = {
263	.driver = {
264		.name = "tegra-gr2d",
265		.of_match_table = gr2d_match,
266	},
267	.probe = gr2d_probe,
268	.remove = gr2d_remove,
269};