1 /*
2 * Copyright 2015 Freescale Semiconductor, Inc.
3 *
4 * Freescale DCU drm device driver
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <linux/console.h>
15 #include <linux/io.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/mm.h>
18 #include <linux/module.h>
19 #include <linux/of_platform.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/regmap.h>
24
25 #include <drm/drmP.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_crtc_helper.h>
28 #include <drm/drm_fb_cma_helper.h>
29 #include <drm/drm_gem_cma_helper.h>
30
31 #include "fsl_dcu_drm_crtc.h"
32 #include "fsl_dcu_drm_drv.h"
33 #include "fsl_tcon.h"
34
fsl_dcu_drm_is_volatile_reg(struct device * dev,unsigned int reg)35 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
36 {
37 if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
38 return true;
39
40 return false;
41 }
42
43 static const struct regmap_config fsl_dcu_regmap_config = {
44 .reg_bits = 32,
45 .reg_stride = 4,
46 .val_bits = 32,
47
48 .volatile_reg = fsl_dcu_drm_is_volatile_reg,
49 };
50
fsl_dcu_drm_irq_init(struct drm_device * dev)51 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
52 {
53 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
54 int ret;
55
56 ret = drm_irq_install(dev, fsl_dev->irq);
57 if (ret < 0)
58 dev_err(dev->dev, "failed to install IRQ handler\n");
59
60 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
61 regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
62
63 return ret;
64 }
65
fsl_dcu_load(struct drm_device * dev,unsigned long flags)66 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
67 {
68 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
69 int ret;
70
71 ret = fsl_dcu_drm_modeset_init(fsl_dev);
72 if (ret < 0) {
73 dev_err(dev->dev, "failed to initialize mode setting\n");
74 return ret;
75 }
76
77 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
78 if (ret < 0) {
79 dev_err(dev->dev, "failed to initialize vblank\n");
80 goto done;
81 }
82
83 ret = fsl_dcu_drm_irq_init(dev);
84 if (ret < 0)
85 goto done;
86 dev->irq_enabled = true;
87
88 fsl_dcu_fbdev_init(dev);
89
90 return 0;
91 done:
92 drm_kms_helper_poll_fini(dev);
93
94 if (fsl_dev->fbdev)
95 drm_fbdev_cma_fini(fsl_dev->fbdev);
96
97 drm_mode_config_cleanup(dev);
98 drm_vblank_cleanup(dev);
99 drm_irq_uninstall(dev);
100 dev->dev_private = NULL;
101
102 return ret;
103 }
104
fsl_dcu_unload(struct drm_device * dev)105 static int fsl_dcu_unload(struct drm_device *dev)
106 {
107 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
108
109 drm_kms_helper_poll_fini(dev);
110
111 if (fsl_dev->fbdev)
112 drm_fbdev_cma_fini(fsl_dev->fbdev);
113
114 drm_mode_config_cleanup(dev);
115 drm_vblank_cleanup(dev);
116 drm_irq_uninstall(dev);
117
118 dev->dev_private = NULL;
119
120 return 0;
121 }
122
fsl_dcu_drm_irq(int irq,void * arg)123 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
124 {
125 struct drm_device *dev = arg;
126 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
127 unsigned int int_status;
128 int ret;
129
130 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
131 if (ret) {
132 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
133 return IRQ_NONE;
134 }
135
136 if (int_status & DCU_INT_STATUS_VBLANK)
137 drm_handle_vblank(dev, 0);
138
139 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
140
141 return IRQ_HANDLED;
142 }
143
fsl_dcu_drm_enable_vblank(struct drm_device * dev,unsigned int pipe)144 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
145 {
146 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
147 unsigned int value;
148
149 regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
150 value &= ~DCU_INT_MASK_VBLANK;
151 regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
152
153 return 0;
154 }
155
fsl_dcu_drm_disable_vblank(struct drm_device * dev,unsigned int pipe)156 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
157 unsigned int pipe)
158 {
159 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
160 unsigned int value;
161
162 regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
163 value |= DCU_INT_MASK_VBLANK;
164 regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
165 }
166
fsl_dcu_drm_lastclose(struct drm_device * dev)167 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
168 {
169 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
170
171 drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
172 }
173
174 static const struct file_operations fsl_dcu_drm_fops = {
175 .owner = THIS_MODULE,
176 .open = drm_open,
177 .release = drm_release,
178 .unlocked_ioctl = drm_ioctl,
179 #ifdef CONFIG_COMPAT
180 .compat_ioctl = drm_compat_ioctl,
181 #endif
182 .poll = drm_poll,
183 .read = drm_read,
184 .llseek = no_llseek,
185 .mmap = drm_gem_cma_mmap,
186 };
187
188 static struct drm_driver fsl_dcu_drm_driver = {
189 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
190 | DRIVER_PRIME | DRIVER_ATOMIC,
191 .lastclose = fsl_dcu_drm_lastclose,
192 .load = fsl_dcu_load,
193 .unload = fsl_dcu_unload,
194 .irq_handler = fsl_dcu_drm_irq,
195 .get_vblank_counter = drm_vblank_no_hw_counter,
196 .enable_vblank = fsl_dcu_drm_enable_vblank,
197 .disable_vblank = fsl_dcu_drm_disable_vblank,
198 .gem_free_object_unlocked = drm_gem_cma_free_object,
199 .gem_vm_ops = &drm_gem_cma_vm_ops,
200 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
201 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
202 .gem_prime_import = drm_gem_prime_import,
203 .gem_prime_export = drm_gem_prime_export,
204 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
205 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
206 .gem_prime_vmap = drm_gem_cma_prime_vmap,
207 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
208 .gem_prime_mmap = drm_gem_cma_prime_mmap,
209 .dumb_create = drm_gem_cma_dumb_create,
210 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
211 .dumb_destroy = drm_gem_dumb_destroy,
212 .fops = &fsl_dcu_drm_fops,
213 .name = "fsl-dcu-drm",
214 .desc = "Freescale DCU DRM",
215 .date = "20160425",
216 .major = 1,
217 .minor = 1,
218 };
219
220 #ifdef CONFIG_PM_SLEEP
fsl_dcu_drm_pm_suspend(struct device * dev)221 static int fsl_dcu_drm_pm_suspend(struct device *dev)
222 {
223 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
224
225 if (!fsl_dev)
226 return 0;
227
228 disable_irq(fsl_dev->irq);
229 drm_kms_helper_poll_disable(fsl_dev->drm);
230
231 console_lock();
232 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
233 console_unlock();
234
235 fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
236 if (IS_ERR(fsl_dev->state)) {
237 console_lock();
238 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
239 console_unlock();
240
241 drm_kms_helper_poll_enable(fsl_dev->drm);
242 enable_irq(fsl_dev->irq);
243 return PTR_ERR(fsl_dev->state);
244 }
245
246 clk_disable_unprepare(fsl_dev->clk);
247
248 return 0;
249 }
250
fsl_dcu_drm_pm_resume(struct device * dev)251 static int fsl_dcu_drm_pm_resume(struct device *dev)
252 {
253 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
254 int ret;
255
256 if (!fsl_dev)
257 return 0;
258
259 ret = clk_prepare_enable(fsl_dev->clk);
260 if (ret < 0) {
261 dev_err(dev, "failed to enable dcu clk\n");
262 return ret;
263 }
264
265 if (fsl_dev->tcon)
266 fsl_tcon_bypass_enable(fsl_dev->tcon);
267 fsl_dcu_drm_init_planes(fsl_dev->drm);
268 enable_irq(fsl_dev->irq);
269 drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
270
271 console_lock();
272 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
273 console_unlock();
274
275 drm_kms_helper_poll_enable(fsl_dev->drm);
276
277 return 0;
278 }
279 #endif
280
281 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
282 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
283 };
284
285 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
286 .name = "ls1021a",
287 .total_layer = 16,
288 .max_layer = 4,
289 .layer_regs = LS1021A_LAYER_REG_NUM,
290 };
291
292 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
293 .name = "vf610",
294 .total_layer = 64,
295 .max_layer = 6,
296 .layer_regs = VF610_LAYER_REG_NUM,
297 };
298
299 static const struct of_device_id fsl_dcu_of_match[] = {
300 {
301 .compatible = "fsl,ls1021a-dcu",
302 .data = &fsl_dcu_ls1021a_data,
303 }, {
304 .compatible = "fsl,vf610-dcu",
305 .data = &fsl_dcu_vf610_data,
306 }, {
307 },
308 };
309 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
310
fsl_dcu_drm_probe(struct platform_device * pdev)311 static int fsl_dcu_drm_probe(struct platform_device *pdev)
312 {
313 struct fsl_dcu_drm_device *fsl_dev;
314 struct drm_device *drm;
315 struct device *dev = &pdev->dev;
316 struct resource *res;
317 void __iomem *base;
318 struct drm_driver *driver = &fsl_dcu_drm_driver;
319 struct clk *pix_clk_in;
320 char pix_clk_name[32];
321 const char *pix_clk_in_name;
322 const struct of_device_id *id;
323 int ret;
324 u8 div_ratio_shift = 0;
325
326 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
327 if (!fsl_dev)
328 return -ENOMEM;
329
330 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
331 if (!id)
332 return -ENODEV;
333 fsl_dev->soc = id->data;
334
335 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
336 if (!res) {
337 dev_err(dev, "could not get memory IO resource\n");
338 return -ENODEV;
339 }
340
341 base = devm_ioremap_resource(dev, res);
342 if (IS_ERR(base)) {
343 ret = PTR_ERR(base);
344 return ret;
345 }
346
347 fsl_dev->irq = platform_get_irq(pdev, 0);
348 if (fsl_dev->irq < 0) {
349 dev_err(dev, "failed to get irq\n");
350 return -ENXIO;
351 }
352
353 fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
354 &fsl_dcu_regmap_config);
355 if (IS_ERR(fsl_dev->regmap)) {
356 dev_err(dev, "regmap init failed\n");
357 return PTR_ERR(fsl_dev->regmap);
358 }
359
360 fsl_dev->clk = devm_clk_get(dev, "dcu");
361 if (IS_ERR(fsl_dev->clk)) {
362 dev_err(dev, "failed to get dcu clock\n");
363 return PTR_ERR(fsl_dev->clk);
364 }
365 ret = clk_prepare_enable(fsl_dev->clk);
366 if (ret < 0) {
367 dev_err(dev, "failed to enable dcu clk\n");
368 return ret;
369 }
370
371 pix_clk_in = devm_clk_get(dev, "pix");
372 if (IS_ERR(pix_clk_in)) {
373 /* legancy binding, use dcu clock as pixel clock input */
374 pix_clk_in = fsl_dev->clk;
375 }
376
377 if (of_property_read_bool(dev->of_node, "big-endian"))
378 div_ratio_shift = 24;
379
380 pix_clk_in_name = __clk_get_name(pix_clk_in);
381 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
382 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
383 pix_clk_in_name, 0, base + DCU_DIV_RATIO,
384 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
385 if (IS_ERR(fsl_dev->pix_clk)) {
386 dev_err(dev, "failed to register pix clk\n");
387 ret = PTR_ERR(fsl_dev->pix_clk);
388 goto disable_clk;
389 }
390
391 fsl_dev->tcon = fsl_tcon_init(dev);
392
393 drm = drm_dev_alloc(driver, dev);
394 if (IS_ERR(drm)) {
395 ret = PTR_ERR(drm);
396 goto unregister_pix_clk;
397 }
398
399 fsl_dev->dev = dev;
400 fsl_dev->drm = drm;
401 fsl_dev->np = dev->of_node;
402 drm->dev_private = fsl_dev;
403 dev_set_drvdata(dev, fsl_dev);
404
405 ret = drm_dev_register(drm, 0);
406 if (ret < 0)
407 goto unref;
408
409 DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
410 driver->major, driver->minor, driver->patchlevel,
411 driver->date, drm->primary->index);
412
413 return 0;
414
415 unref:
416 drm_dev_unref(drm);
417 unregister_pix_clk:
418 clk_unregister(fsl_dev->pix_clk);
419 disable_clk:
420 clk_disable_unprepare(fsl_dev->clk);
421 return ret;
422 }
423
fsl_dcu_drm_remove(struct platform_device * pdev)424 static int fsl_dcu_drm_remove(struct platform_device *pdev)
425 {
426 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
427
428 clk_disable_unprepare(fsl_dev->clk);
429 clk_unregister(fsl_dev->pix_clk);
430 drm_put_dev(fsl_dev->drm);
431
432 return 0;
433 }
434
435 static struct platform_driver fsl_dcu_drm_platform_driver = {
436 .probe = fsl_dcu_drm_probe,
437 .remove = fsl_dcu_drm_remove,
438 .driver = {
439 .name = "fsl-dcu",
440 .pm = &fsl_dcu_drm_pm_ops,
441 .of_match_table = fsl_dcu_of_match,
442 },
443 };
444
445 module_platform_driver(fsl_dcu_drm_platform_driver);
446
447 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
448 MODULE_LICENSE("GPL");
449