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/delay.h>
8 #include <linux/iommu.h>
9 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/reset.h>
12
13 #include "drm.h"
14 #include "gem.h"
15 #include "gr2d.h"
16
17 struct gr2d_soc {
18 unsigned int version;
19 };
20
21 struct gr2d {
22 struct tegra_drm_client client;
23 struct host1x_channel *channel;
24 struct reset_control *rst;
25 struct clk *clk;
26
27 const struct gr2d_soc *soc;
28
29 DECLARE_BITMAP(addr_regs, GR2D_NUM_REGS);
30 };
31
to_gr2d(struct tegra_drm_client * client)32 static inline struct gr2d *to_gr2d(struct tegra_drm_client *client)
33 {
34 return container_of(client, struct gr2d, client);
35 }
36
gr2d_init(struct host1x_client * client)37 static int gr2d_init(struct host1x_client *client)
38 {
39 struct tegra_drm_client *drm = host1x_to_drm_client(client);
40 struct drm_device *dev = dev_get_drvdata(client->host);
41 unsigned long flags = HOST1X_SYNCPT_HAS_BASE;
42 struct gr2d *gr2d = to_gr2d(drm);
43 int err;
44
45 gr2d->channel = host1x_channel_request(client);
46 if (!gr2d->channel)
47 return -ENOMEM;
48
49 client->syncpts[0] = host1x_syncpt_request(client, flags);
50 if (!client->syncpts[0]) {
51 err = -ENOMEM;
52 dev_err(client->dev, "failed to request syncpoint: %d\n", err);
53 goto put;
54 }
55
56 err = host1x_client_iommu_attach(client);
57 if (err < 0) {
58 dev_err(client->dev, "failed to attach to domain: %d\n", err);
59 goto free;
60 }
61
62 err = tegra_drm_register_client(dev->dev_private, drm);
63 if (err < 0) {
64 dev_err(client->dev, "failed to register client: %d\n", err);
65 goto detach;
66 }
67
68 return 0;
69
70 detach:
71 host1x_client_iommu_detach(client);
72 free:
73 host1x_syncpt_put(client->syncpts[0]);
74 put:
75 host1x_channel_put(gr2d->channel);
76 return err;
77 }
78
gr2d_exit(struct host1x_client * client)79 static int gr2d_exit(struct host1x_client *client)
80 {
81 struct tegra_drm_client *drm = host1x_to_drm_client(client);
82 struct drm_device *dev = dev_get_drvdata(client->host);
83 struct tegra_drm *tegra = dev->dev_private;
84 struct gr2d *gr2d = to_gr2d(drm);
85 int err;
86
87 err = tegra_drm_unregister_client(tegra, drm);
88 if (err < 0)
89 return err;
90
91 host1x_client_iommu_detach(client);
92 host1x_syncpt_put(client->syncpts[0]);
93 host1x_channel_put(gr2d->channel);
94
95 return 0;
96 }
97
98 static const struct host1x_client_ops gr2d_client_ops = {
99 .init = gr2d_init,
100 .exit = gr2d_exit,
101 };
102
gr2d_open_channel(struct tegra_drm_client * client,struct tegra_drm_context * context)103 static int gr2d_open_channel(struct tegra_drm_client *client,
104 struct tegra_drm_context *context)
105 {
106 struct gr2d *gr2d = to_gr2d(client);
107
108 context->channel = host1x_channel_get(gr2d->channel);
109 if (!context->channel)
110 return -ENOMEM;
111
112 return 0;
113 }
114
gr2d_close_channel(struct tegra_drm_context * context)115 static void gr2d_close_channel(struct tegra_drm_context *context)
116 {
117 host1x_channel_put(context->channel);
118 }
119
gr2d_is_addr_reg(struct device * dev,u32 class,u32 offset)120 static int gr2d_is_addr_reg(struct device *dev, u32 class, u32 offset)
121 {
122 struct gr2d *gr2d = dev_get_drvdata(dev);
123
124 switch (class) {
125 case HOST1X_CLASS_HOST1X:
126 if (offset == 0x2b)
127 return 1;
128
129 break;
130
131 case HOST1X_CLASS_GR2D:
132 case HOST1X_CLASS_GR2D_SB:
133 if (offset >= GR2D_NUM_REGS)
134 break;
135
136 if (test_bit(offset, gr2d->addr_regs))
137 return 1;
138
139 break;
140 }
141
142 return 0;
143 }
144
gr2d_is_valid_class(u32 class)145 static int gr2d_is_valid_class(u32 class)
146 {
147 return (class == HOST1X_CLASS_GR2D ||
148 class == HOST1X_CLASS_GR2D_SB);
149 }
150
151 static const struct tegra_drm_client_ops gr2d_ops = {
152 .open_channel = gr2d_open_channel,
153 .close_channel = gr2d_close_channel,
154 .is_addr_reg = gr2d_is_addr_reg,
155 .is_valid_class = gr2d_is_valid_class,
156 .submit = tegra_drm_submit,
157 };
158
159 static const struct gr2d_soc tegra20_gr2d_soc = {
160 .version = 0x20,
161 };
162
163 static const struct gr2d_soc tegra30_gr2d_soc = {
164 .version = 0x30,
165 };
166
167 static const struct gr2d_soc tegra114_gr2d_soc = {
168 .version = 0x35,
169 };
170
171 static const struct of_device_id gr2d_match[] = {
172 { .compatible = "nvidia,tegra114-gr2d", .data = &tegra114_gr2d_soc },
173 { .compatible = "nvidia,tegra30-gr2d", .data = &tegra30_gr2d_soc },
174 { .compatible = "nvidia,tegra20-gr2d", .data = &tegra20_gr2d_soc },
175 { },
176 };
177 MODULE_DEVICE_TABLE(of, gr2d_match);
178
179 static const u32 gr2d_addr_regs[] = {
180 GR2D_UA_BASE_ADDR,
181 GR2D_VA_BASE_ADDR,
182 GR2D_PAT_BASE_ADDR,
183 GR2D_DSTA_BASE_ADDR,
184 GR2D_DSTB_BASE_ADDR,
185 GR2D_DSTC_BASE_ADDR,
186 GR2D_SRCA_BASE_ADDR,
187 GR2D_SRCB_BASE_ADDR,
188 GR2D_PATBASE_ADDR,
189 GR2D_SRC_BASE_ADDR_SB,
190 GR2D_DSTA_BASE_ADDR_SB,
191 GR2D_DSTB_BASE_ADDR_SB,
192 GR2D_UA_BASE_ADDR_SB,
193 GR2D_VA_BASE_ADDR_SB,
194 };
195
gr2d_probe(struct platform_device * pdev)196 static int gr2d_probe(struct platform_device *pdev)
197 {
198 struct device *dev = &pdev->dev;
199 struct host1x_syncpt **syncpts;
200 struct gr2d *gr2d;
201 unsigned int i;
202 int err;
203
204 gr2d = devm_kzalloc(dev, sizeof(*gr2d), GFP_KERNEL);
205 if (!gr2d)
206 return -ENOMEM;
207
208 gr2d->soc = of_device_get_match_data(dev);
209
210 syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
211 if (!syncpts)
212 return -ENOMEM;
213
214 gr2d->rst = devm_reset_control_get(dev, NULL);
215 if (IS_ERR(gr2d->rst)) {
216 dev_err(dev, "cannot get reset\n");
217 return PTR_ERR(gr2d->rst);
218 }
219
220 gr2d->clk = devm_clk_get(dev, NULL);
221 if (IS_ERR(gr2d->clk)) {
222 dev_err(dev, "cannot get clock\n");
223 return PTR_ERR(gr2d->clk);
224 }
225
226 err = clk_prepare_enable(gr2d->clk);
227 if (err) {
228 dev_err(dev, "cannot turn on clock\n");
229 return err;
230 }
231
232 usleep_range(2000, 4000);
233
234 err = reset_control_deassert(gr2d->rst);
235 if (err < 0) {
236 dev_err(dev, "failed to deassert reset: %d\n", err);
237 goto disable_clk;
238 }
239
240 INIT_LIST_HEAD(&gr2d->client.base.list);
241 gr2d->client.base.ops = &gr2d_client_ops;
242 gr2d->client.base.dev = dev;
243 gr2d->client.base.class = HOST1X_CLASS_GR2D;
244 gr2d->client.base.syncpts = syncpts;
245 gr2d->client.base.num_syncpts = 1;
246
247 INIT_LIST_HEAD(&gr2d->client.list);
248 gr2d->client.version = gr2d->soc->version;
249 gr2d->client.ops = &gr2d_ops;
250
251 err = host1x_client_register(&gr2d->client.base);
252 if (err < 0) {
253 dev_err(dev, "failed to register host1x client: %d\n", err);
254 goto assert_rst;
255 }
256
257 /* initialize address register map */
258 for (i = 0; i < ARRAY_SIZE(gr2d_addr_regs); i++)
259 set_bit(gr2d_addr_regs[i], gr2d->addr_regs);
260
261 platform_set_drvdata(pdev, gr2d);
262
263 return 0;
264
265 assert_rst:
266 (void)reset_control_assert(gr2d->rst);
267 disable_clk:
268 clk_disable_unprepare(gr2d->clk);
269
270 return err;
271 }
272
gr2d_remove(struct platform_device * pdev)273 static int gr2d_remove(struct platform_device *pdev)
274 {
275 struct gr2d *gr2d = platform_get_drvdata(pdev);
276 int err;
277
278 err = host1x_client_unregister(&gr2d->client.base);
279 if (err < 0) {
280 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
281 err);
282 return err;
283 }
284
285 err = reset_control_assert(gr2d->rst);
286 if (err < 0)
287 dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
288
289 usleep_range(2000, 4000);
290
291 clk_disable_unprepare(gr2d->clk);
292
293 return 0;
294 }
295
296 struct platform_driver tegra_gr2d_driver = {
297 .driver = {
298 .name = "tegra-gr2d",
299 .of_match_table = gr2d_match,
300 },
301 .probe = gr2d_probe,
302 .remove = gr2d_remove,
303 };
304