1 /* Hisilicon Hibmc SoC drm driver
2  *
3  * Based on the bochs drm driver.
4  *
5  * Copyright (c) 2016 Huawei Limited.
6  *
7  * Author:
8  *	Rongrong Zou <zourongrong@huawei.com>
9  *	Rongrong Zou <zourongrong@gmail.com>
10  *	Jianhua Li <lijianhua@huawei.com>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  */
18 
19 #include <linux/console.h>
20 #include <linux/module.h>
21 
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_crtc_helper.h>
24 
25 #include "hibmc_drm_drv.h"
26 #include "hibmc_drm_regs.h"
27 
28 static const struct file_operations hibmc_fops = {
29 	.owner		= THIS_MODULE,
30 	.open		= drm_open,
31 	.release	= drm_release,
32 	.unlocked_ioctl	= drm_ioctl,
33 	.compat_ioctl	= drm_compat_ioctl,
34 	.mmap		= hibmc_mmap,
35 	.poll		= drm_poll,
36 	.read		= drm_read,
37 	.llseek		= no_llseek,
38 };
39 
40 static irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
41 {
42 	struct drm_device *dev = (struct drm_device *)arg;
43 	struct hibmc_drm_private *priv =
44 		(struct hibmc_drm_private *)dev->dev_private;
45 	u32 status;
46 
47 	status = readl(priv->mmio + HIBMC_RAW_INTERRUPT);
48 
49 	if (status & HIBMC_RAW_INTERRUPT_VBLANK(1)) {
50 		writel(HIBMC_RAW_INTERRUPT_VBLANK(1),
51 		       priv->mmio + HIBMC_RAW_INTERRUPT);
52 		drm_handle_vblank(dev, 0);
53 	}
54 
55 	return IRQ_HANDLED;
56 }
57 
58 static struct drm_driver hibmc_driver = {
59 	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
60 				  DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
61 	.fops			= &hibmc_fops,
62 	.name			= "hibmc",
63 	.date			= "20160828",
64 	.desc			= "hibmc drm driver",
65 	.major			= 1,
66 	.minor			= 0,
67 	.gem_free_object_unlocked = hibmc_gem_free_object,
68 	.dumb_create            = hibmc_dumb_create,
69 	.dumb_map_offset        = hibmc_dumb_mmap_offset,
70 	.irq_handler		= hibmc_drm_interrupt,
71 };
72 
73 static int __maybe_unused hibmc_pm_suspend(struct device *dev)
74 {
75 	struct pci_dev *pdev = to_pci_dev(dev);
76 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
77 
78 	return drm_mode_config_helper_suspend(drm_dev);
79 }
80 
81 static int  __maybe_unused hibmc_pm_resume(struct device *dev)
82 {
83 	struct pci_dev *pdev = to_pci_dev(dev);
84 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
85 
86 	return drm_mode_config_helper_resume(drm_dev);
87 }
88 
89 static const struct dev_pm_ops hibmc_pm_ops = {
90 	SET_SYSTEM_SLEEP_PM_OPS(hibmc_pm_suspend,
91 				hibmc_pm_resume)
92 };
93 
94 static int hibmc_kms_init(struct hibmc_drm_private *priv)
95 {
96 	int ret;
97 
98 	drm_mode_config_init(priv->dev);
99 	priv->mode_config_initialized = true;
100 
101 	priv->dev->mode_config.min_width = 0;
102 	priv->dev->mode_config.min_height = 0;
103 	priv->dev->mode_config.max_width = 1920;
104 	priv->dev->mode_config.max_height = 1440;
105 
106 	priv->dev->mode_config.fb_base = priv->fb_base;
107 	priv->dev->mode_config.preferred_depth = 24;
108 	priv->dev->mode_config.prefer_shadow = 0;
109 
110 	priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
111 
112 	ret = hibmc_de_init(priv);
113 	if (ret) {
114 		DRM_ERROR("failed to init de: %d\n", ret);
115 		return ret;
116 	}
117 
118 	ret = hibmc_vdac_init(priv);
119 	if (ret) {
120 		DRM_ERROR("failed to init vdac: %d\n", ret);
121 		return ret;
122 	}
123 
124 	return 0;
125 }
126 
127 static void hibmc_kms_fini(struct hibmc_drm_private *priv)
128 {
129 	if (priv->mode_config_initialized) {
130 		drm_mode_config_cleanup(priv->dev);
131 		priv->mode_config_initialized = false;
132 	}
133 }
134 
135 /*
136  * It can operate in one of three modes: 0, 1 or Sleep.
137  */
138 void hibmc_set_power_mode(struct hibmc_drm_private *priv,
139 			  unsigned int power_mode)
140 {
141 	unsigned int control_value = 0;
142 	void __iomem   *mmio = priv->mmio;
143 	unsigned int input = 1;
144 
145 	if (power_mode > HIBMC_PW_MODE_CTL_MODE_SLEEP)
146 		return;
147 
148 	if (power_mode == HIBMC_PW_MODE_CTL_MODE_SLEEP)
149 		input = 0;
150 
151 	control_value = readl(mmio + HIBMC_POWER_MODE_CTRL);
152 	control_value &= ~(HIBMC_PW_MODE_CTL_MODE_MASK |
153 			   HIBMC_PW_MODE_CTL_OSC_INPUT_MASK);
154 	control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_MODE, power_mode);
155 	control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_OSC_INPUT, input);
156 	writel(control_value, mmio + HIBMC_POWER_MODE_CTRL);
157 }
158 
159 void hibmc_set_current_gate(struct hibmc_drm_private *priv, unsigned int gate)
160 {
161 	unsigned int gate_reg;
162 	unsigned int mode;
163 	void __iomem   *mmio = priv->mmio;
164 
165 	/* Get current power mode. */
166 	mode = (readl(mmio + HIBMC_POWER_MODE_CTRL) &
167 		HIBMC_PW_MODE_CTL_MODE_MASK) >> HIBMC_PW_MODE_CTL_MODE_SHIFT;
168 
169 	switch (mode) {
170 	case HIBMC_PW_MODE_CTL_MODE_MODE0:
171 		gate_reg = HIBMC_MODE0_GATE;
172 		break;
173 
174 	case HIBMC_PW_MODE_CTL_MODE_MODE1:
175 		gate_reg = HIBMC_MODE1_GATE;
176 		break;
177 
178 	default:
179 		gate_reg = HIBMC_MODE0_GATE;
180 		break;
181 	}
182 	writel(gate, mmio + gate_reg);
183 }
184 
185 static void hibmc_hw_config(struct hibmc_drm_private *priv)
186 {
187 	unsigned int reg;
188 
189 	/* On hardware reset, power mode 0 is default. */
190 	hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0);
191 
192 	/* Enable display power gate & LOCALMEM power gate*/
193 	reg = readl(priv->mmio + HIBMC_CURRENT_GATE);
194 	reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK;
195 	reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK;
196 	reg |= HIBMC_CURR_GATE_DISPLAY(1);
197 	reg |= HIBMC_CURR_GATE_LOCALMEM(1);
198 
199 	hibmc_set_current_gate(priv, reg);
200 
201 	/*
202 	 * Reset the memory controller. If the memory controller
203 	 * is not reset in chip,the system might hang when sw accesses
204 	 * the memory.The memory should be resetted after
205 	 * changing the MXCLK.
206 	 */
207 	reg = readl(priv->mmio + HIBMC_MISC_CTRL);
208 	reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK;
209 	reg |= HIBMC_MSCCTL_LOCALMEM_RESET(0);
210 	writel(reg, priv->mmio + HIBMC_MISC_CTRL);
211 
212 	reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK;
213 	reg |= HIBMC_MSCCTL_LOCALMEM_RESET(1);
214 
215 	writel(reg, priv->mmio + HIBMC_MISC_CTRL);
216 }
217 
218 static int hibmc_hw_map(struct hibmc_drm_private *priv)
219 {
220 	struct drm_device *dev = priv->dev;
221 	struct pci_dev *pdev = dev->pdev;
222 	resource_size_t addr, size, ioaddr, iosize;
223 
224 	ioaddr = pci_resource_start(pdev, 1);
225 	iosize = pci_resource_len(pdev, 1);
226 	priv->mmio = devm_ioremap_nocache(dev->dev, ioaddr, iosize);
227 	if (!priv->mmio) {
228 		DRM_ERROR("Cannot map mmio region\n");
229 		return -ENOMEM;
230 	}
231 
232 	addr = pci_resource_start(pdev, 0);
233 	size = pci_resource_len(pdev, 0);
234 	priv->fb_map = devm_ioremap(dev->dev, addr, size);
235 	if (!priv->fb_map) {
236 		DRM_ERROR("Cannot map framebuffer\n");
237 		return -ENOMEM;
238 	}
239 	priv->fb_base = addr;
240 	priv->fb_size = size;
241 
242 	return 0;
243 }
244 
245 static int hibmc_hw_init(struct hibmc_drm_private *priv)
246 {
247 	int ret;
248 
249 	ret = hibmc_hw_map(priv);
250 	if (ret)
251 		return ret;
252 
253 	hibmc_hw_config(priv);
254 
255 	return 0;
256 }
257 
258 static int hibmc_unload(struct drm_device *dev)
259 {
260 	struct hibmc_drm_private *priv = dev->dev_private;
261 
262 	hibmc_fbdev_fini(priv);
263 
264 	drm_atomic_helper_shutdown(dev);
265 
266 	if (dev->irq_enabled)
267 		drm_irq_uninstall(dev);
268 	if (priv->msi_enabled)
269 		pci_disable_msi(dev->pdev);
270 
271 	hibmc_kms_fini(priv);
272 	hibmc_mm_fini(priv);
273 	dev->dev_private = NULL;
274 	return 0;
275 }
276 
277 static int hibmc_load(struct drm_device *dev)
278 {
279 	struct hibmc_drm_private *priv;
280 	int ret;
281 
282 	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
283 	if (!priv) {
284 		DRM_ERROR("no memory to allocate for hibmc_drm_private\n");
285 		return -ENOMEM;
286 	}
287 	dev->dev_private = priv;
288 	priv->dev = dev;
289 
290 	ret = hibmc_hw_init(priv);
291 	if (ret)
292 		goto err;
293 
294 	ret = hibmc_mm_init(priv);
295 	if (ret)
296 		goto err;
297 
298 	ret = hibmc_kms_init(priv);
299 	if (ret)
300 		goto err;
301 
302 	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
303 	if (ret) {
304 		DRM_ERROR("failed to initialize vblank: %d\n", ret);
305 		goto err;
306 	}
307 
308 	priv->msi_enabled = 0;
309 	ret = pci_enable_msi(dev->pdev);
310 	if (ret) {
311 		DRM_WARN("enabling MSI failed: %d\n", ret);
312 	} else {
313 		priv->msi_enabled = 1;
314 		ret = drm_irq_install(dev, dev->pdev->irq);
315 		if (ret)
316 			DRM_WARN("install irq failed: %d\n", ret);
317 	}
318 
319 	/* reset all the states of crtc/plane/encoder/connector */
320 	drm_mode_config_reset(dev);
321 
322 	ret = hibmc_fbdev_init(priv);
323 	if (ret) {
324 		DRM_ERROR("failed to initialize fbdev: %d\n", ret);
325 		goto err;
326 	}
327 
328 	return 0;
329 
330 err:
331 	hibmc_unload(dev);
332 	DRM_ERROR("failed to initialize drm driver: %d\n", ret);
333 	return ret;
334 }
335 
336 static int hibmc_pci_probe(struct pci_dev *pdev,
337 			   const struct pci_device_id *ent)
338 {
339 	struct drm_device *dev;
340 	int ret;
341 
342 	dev = drm_dev_alloc(&hibmc_driver, &pdev->dev);
343 	if (IS_ERR(dev)) {
344 		DRM_ERROR("failed to allocate drm_device\n");
345 		return PTR_ERR(dev);
346 	}
347 
348 	dev->pdev = pdev;
349 	pci_set_drvdata(pdev, dev);
350 
351 	ret = pci_enable_device(pdev);
352 	if (ret) {
353 		DRM_ERROR("failed to enable pci device: %d\n", ret);
354 		goto err_free;
355 	}
356 
357 	ret = hibmc_load(dev);
358 	if (ret) {
359 		DRM_ERROR("failed to load hibmc: %d\n", ret);
360 		goto err_disable;
361 	}
362 
363 	ret = drm_dev_register(dev, 0);
364 	if (ret) {
365 		DRM_ERROR("failed to register drv for userspace access: %d\n",
366 			  ret);
367 		goto err_unload;
368 	}
369 	return 0;
370 
371 err_unload:
372 	hibmc_unload(dev);
373 err_disable:
374 	pci_disable_device(pdev);
375 err_free:
376 	drm_dev_put(dev);
377 
378 	return ret;
379 }
380 
381 static void hibmc_pci_remove(struct pci_dev *pdev)
382 {
383 	struct drm_device *dev = pci_get_drvdata(pdev);
384 
385 	drm_dev_unregister(dev);
386 	hibmc_unload(dev);
387 	drm_dev_put(dev);
388 }
389 
390 static struct pci_device_id hibmc_pci_table[] = {
391 	{ PCI_VDEVICE(HUAWEI, 0x1711) },
392 	{0,}
393 };
394 
395 static struct pci_driver hibmc_pci_driver = {
396 	.name =		"hibmc-drm",
397 	.id_table =	hibmc_pci_table,
398 	.probe =	hibmc_pci_probe,
399 	.remove =	hibmc_pci_remove,
400 	.driver.pm =    &hibmc_pm_ops,
401 };
402 
403 static int __init hibmc_init(void)
404 {
405 	return pci_register_driver(&hibmc_pci_driver);
406 }
407 
408 static void __exit hibmc_exit(void)
409 {
410 	return pci_unregister_driver(&hibmc_pci_driver);
411 }
412 
413 module_init(hibmc_init);
414 module_exit(hibmc_exit);
415 
416 MODULE_DEVICE_TABLE(pci, hibmc_pci_table);
417 MODULE_AUTHOR("RongrongZou <zourongrong@huawei.com>");
418 MODULE_DESCRIPTION("DRM Driver for Hisilicon Hibmc");
419 MODULE_LICENSE("GPL v2");
420