xref: /openbmc/linux/drivers/gpu/drm/tegra/vic.c (revision 5d0e4d78)
1 /*
2  * Copyright (c) 2015, NVIDIA Corporation.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 
9 #include <linux/clk.h>
10 #include <linux/host1x.h>
11 #include <linux/iommu.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15 #include <linux/of_platform.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/reset.h>
19 
20 #include <soc/tegra/pmc.h>
21 
22 #include "drm.h"
23 #include "falcon.h"
24 #include "vic.h"
25 
26 struct vic_config {
27 	const char *firmware;
28 };
29 
30 struct vic {
31 	struct falcon falcon;
32 	bool booted;
33 
34 	void __iomem *regs;
35 	struct tegra_drm_client client;
36 	struct host1x_channel *channel;
37 	struct iommu_domain *domain;
38 	struct device *dev;
39 	struct clk *clk;
40 
41 	/* Platform configuration */
42 	const struct vic_config *config;
43 };
44 
45 static inline struct vic *to_vic(struct tegra_drm_client *client)
46 {
47 	return container_of(client, struct vic, client);
48 }
49 
50 static void vic_writel(struct vic *vic, u32 value, unsigned int offset)
51 {
52 	writel(value, vic->regs + offset);
53 }
54 
55 static int vic_runtime_resume(struct device *dev)
56 {
57 	struct vic *vic = dev_get_drvdata(dev);
58 
59 	return clk_prepare_enable(vic->clk);
60 }
61 
62 static int vic_runtime_suspend(struct device *dev)
63 {
64 	struct vic *vic = dev_get_drvdata(dev);
65 
66 	clk_disable_unprepare(vic->clk);
67 
68 	vic->booted = false;
69 
70 	return 0;
71 }
72 
73 static int vic_boot(struct vic *vic)
74 {
75 	u32 fce_ucode_size, fce_bin_data_offset;
76 	void *hdr;
77 	int err = 0;
78 
79 	if (vic->booted)
80 		return 0;
81 
82 	/* setup clockgating registers */
83 	vic_writel(vic, CG_IDLE_CG_DLY_CNT(4) |
84 			CG_IDLE_CG_EN |
85 			CG_WAKEUP_DLY_CNT(4),
86 		   NV_PVIC_MISC_PRI_VIC_CG);
87 
88 	err = falcon_boot(&vic->falcon);
89 	if (err < 0)
90 		return err;
91 
92 	hdr = vic->falcon.firmware.vaddr;
93 	fce_bin_data_offset = *(u32 *)(hdr + VIC_UCODE_FCE_DATA_OFFSET);
94 	hdr = vic->falcon.firmware.vaddr +
95 		*(u32 *)(hdr + VIC_UCODE_FCE_HEADER_OFFSET);
96 	fce_ucode_size = *(u32 *)(hdr + FCE_UCODE_SIZE_OFFSET);
97 
98 	falcon_execute_method(&vic->falcon, VIC_SET_APPLICATION_ID, 1);
99 	falcon_execute_method(&vic->falcon, VIC_SET_FCE_UCODE_SIZE,
100 			      fce_ucode_size);
101 	falcon_execute_method(&vic->falcon, VIC_SET_FCE_UCODE_OFFSET,
102 			      (vic->falcon.firmware.paddr + fce_bin_data_offset)
103 				>> 8);
104 
105 	err = falcon_wait_idle(&vic->falcon);
106 	if (err < 0) {
107 		dev_err(vic->dev,
108 			"failed to set application ID and FCE base\n");
109 		return err;
110 	}
111 
112 	vic->booted = true;
113 
114 	return 0;
115 }
116 
117 static void *vic_falcon_alloc(struct falcon *falcon, size_t size,
118 			       dma_addr_t *iova)
119 {
120 	struct tegra_drm *tegra = falcon->data;
121 
122 	return tegra_drm_alloc(tegra, size, iova);
123 }
124 
125 static void vic_falcon_free(struct falcon *falcon, size_t size,
126 			    dma_addr_t iova, void *va)
127 {
128 	struct tegra_drm *tegra = falcon->data;
129 
130 	return tegra_drm_free(tegra, size, va, iova);
131 }
132 
133 static const struct falcon_ops vic_falcon_ops = {
134 	.alloc = vic_falcon_alloc,
135 	.free = vic_falcon_free
136 };
137 
138 static int vic_init(struct host1x_client *client)
139 {
140 	struct tegra_drm_client *drm = host1x_to_drm_client(client);
141 	struct drm_device *dev = dev_get_drvdata(client->parent);
142 	struct tegra_drm *tegra = dev->dev_private;
143 	struct vic *vic = to_vic(drm);
144 	int err;
145 
146 	if (tegra->domain) {
147 		err = iommu_attach_device(tegra->domain, vic->dev);
148 		if (err < 0) {
149 			dev_err(vic->dev, "failed to attach to domain: %d\n",
150 				err);
151 			return err;
152 		}
153 
154 		vic->domain = tegra->domain;
155 	}
156 
157 	if (!vic->falcon.data) {
158 		vic->falcon.data = tegra;
159 		err = falcon_load_firmware(&vic->falcon);
160 		if (err < 0)
161 			goto detach_device;
162 	}
163 
164 	vic->channel = host1x_channel_request(client->dev);
165 	if (!vic->channel) {
166 		err = -ENOMEM;
167 		goto detach_device;
168 	}
169 
170 	client->syncpts[0] = host1x_syncpt_request(client->dev, 0);
171 	if (!client->syncpts[0]) {
172 		err = -ENOMEM;
173 		goto free_channel;
174 	}
175 
176 	err = tegra_drm_register_client(tegra, drm);
177 	if (err < 0)
178 		goto free_syncpt;
179 
180 	return 0;
181 
182 free_syncpt:
183 	host1x_syncpt_free(client->syncpts[0]);
184 free_channel:
185 	host1x_channel_put(vic->channel);
186 detach_device:
187 	if (tegra->domain)
188 		iommu_detach_device(tegra->domain, vic->dev);
189 
190 	return err;
191 }
192 
193 static int vic_exit(struct host1x_client *client)
194 {
195 	struct tegra_drm_client *drm = host1x_to_drm_client(client);
196 	struct drm_device *dev = dev_get_drvdata(client->parent);
197 	struct tegra_drm *tegra = dev->dev_private;
198 	struct vic *vic = to_vic(drm);
199 	int err;
200 
201 	err = tegra_drm_unregister_client(tegra, drm);
202 	if (err < 0)
203 		return err;
204 
205 	host1x_syncpt_free(client->syncpts[0]);
206 	host1x_channel_put(vic->channel);
207 
208 	if (vic->domain) {
209 		iommu_detach_device(vic->domain, vic->dev);
210 		vic->domain = NULL;
211 	}
212 
213 	return 0;
214 }
215 
216 static const struct host1x_client_ops vic_client_ops = {
217 	.init = vic_init,
218 	.exit = vic_exit,
219 };
220 
221 static int vic_open_channel(struct tegra_drm_client *client,
222 			    struct tegra_drm_context *context)
223 {
224 	struct vic *vic = to_vic(client);
225 	int err;
226 
227 	err = pm_runtime_get_sync(vic->dev);
228 	if (err < 0)
229 		return err;
230 
231 	err = vic_boot(vic);
232 	if (err < 0) {
233 		pm_runtime_put(vic->dev);
234 		return err;
235 	}
236 
237 	context->channel = host1x_channel_get(vic->channel);
238 	if (!context->channel) {
239 		pm_runtime_put(vic->dev);
240 		return -ENOMEM;
241 	}
242 
243 	return 0;
244 }
245 
246 static void vic_close_channel(struct tegra_drm_context *context)
247 {
248 	struct vic *vic = to_vic(context->client);
249 
250 	host1x_channel_put(context->channel);
251 
252 	pm_runtime_put(vic->dev);
253 }
254 
255 static const struct tegra_drm_client_ops vic_ops = {
256 	.open_channel = vic_open_channel,
257 	.close_channel = vic_close_channel,
258 	.submit = tegra_drm_submit,
259 };
260 
261 static const struct vic_config vic_t124_config = {
262 	.firmware = "nvidia/tegra124/vic03_ucode.bin",
263 };
264 
265 static const struct vic_config vic_t210_config = {
266 	.firmware = "nvidia/tegra210/vic04_ucode.bin",
267 };
268 
269 static const struct of_device_id vic_match[] = {
270 	{ .compatible = "nvidia,tegra124-vic", .data = &vic_t124_config },
271 	{ .compatible = "nvidia,tegra210-vic", .data = &vic_t210_config },
272 	{ },
273 };
274 
275 static int vic_probe(struct platform_device *pdev)
276 {
277 	struct vic_config *vic_config = NULL;
278 	struct device *dev = &pdev->dev;
279 	struct host1x_syncpt **syncpts;
280 	struct resource *regs;
281 	const struct of_device_id *match;
282 	struct vic *vic;
283 	int err;
284 
285 	match = of_match_device(vic_match, dev);
286 	vic_config = (struct vic_config *)match->data;
287 
288 	vic = devm_kzalloc(dev, sizeof(*vic), GFP_KERNEL);
289 	if (!vic)
290 		return -ENOMEM;
291 
292 	syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
293 	if (!syncpts)
294 		return -ENOMEM;
295 
296 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
297 	if (!regs) {
298 		dev_err(&pdev->dev, "failed to get registers\n");
299 		return -ENXIO;
300 	}
301 
302 	vic->regs = devm_ioremap_resource(dev, regs);
303 	if (IS_ERR(vic->regs))
304 		return PTR_ERR(vic->regs);
305 
306 	vic->clk = devm_clk_get(dev, NULL);
307 	if (IS_ERR(vic->clk)) {
308 		dev_err(&pdev->dev, "failed to get clock\n");
309 		return PTR_ERR(vic->clk);
310 	}
311 
312 	vic->falcon.dev = dev;
313 	vic->falcon.regs = vic->regs;
314 	vic->falcon.ops = &vic_falcon_ops;
315 
316 	err = falcon_init(&vic->falcon);
317 	if (err < 0)
318 		return err;
319 
320 	err = falcon_read_firmware(&vic->falcon, vic_config->firmware);
321 	if (err < 0)
322 		goto exit_falcon;
323 
324 	platform_set_drvdata(pdev, vic);
325 
326 	INIT_LIST_HEAD(&vic->client.base.list);
327 	vic->client.base.ops = &vic_client_ops;
328 	vic->client.base.dev = dev;
329 	vic->client.base.class = HOST1X_CLASS_VIC;
330 	vic->client.base.syncpts = syncpts;
331 	vic->client.base.num_syncpts = 1;
332 	vic->dev = dev;
333 	vic->config = vic_config;
334 
335 	INIT_LIST_HEAD(&vic->client.list);
336 	vic->client.ops = &vic_ops;
337 
338 	err = host1x_client_register(&vic->client.base);
339 	if (err < 0) {
340 		dev_err(dev, "failed to register host1x client: %d\n", err);
341 		platform_set_drvdata(pdev, NULL);
342 		goto exit_falcon;
343 	}
344 
345 	pm_runtime_enable(&pdev->dev);
346 	if (!pm_runtime_enabled(&pdev->dev)) {
347 		err = vic_runtime_resume(&pdev->dev);
348 		if (err < 0)
349 			goto unregister_client;
350 	}
351 
352 	return 0;
353 
354 unregister_client:
355 	host1x_client_unregister(&vic->client.base);
356 exit_falcon:
357 	falcon_exit(&vic->falcon);
358 
359 	return err;
360 }
361 
362 static int vic_remove(struct platform_device *pdev)
363 {
364 	struct vic *vic = platform_get_drvdata(pdev);
365 	int err;
366 
367 	err = host1x_client_unregister(&vic->client.base);
368 	if (err < 0) {
369 		dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
370 			err);
371 		return err;
372 	}
373 
374 	if (pm_runtime_enabled(&pdev->dev))
375 		pm_runtime_disable(&pdev->dev);
376 	else
377 		vic_runtime_suspend(&pdev->dev);
378 
379 	falcon_exit(&vic->falcon);
380 
381 	return 0;
382 }
383 
384 static const struct dev_pm_ops vic_pm_ops = {
385 	SET_RUNTIME_PM_OPS(vic_runtime_suspend, vic_runtime_resume, NULL)
386 };
387 
388 struct platform_driver tegra_vic_driver = {
389 	.driver = {
390 		.name = "tegra-vic",
391 		.of_match_table = vic_match,
392 		.pm = &vic_pm_ops
393 	},
394 	.probe = vic_probe,
395 	.remove = vic_remove,
396 };
397