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