1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2015 Freescale Semiconductor, Inc.
  4 *
  5 * Freescale DCU drm device driver
  6 */
  7
  8#include <linux/clk.h>
  9#include <linux/clk-provider.h>
 10#include <linux/console.h>
 11#include <linux/io.h>
 12#include <linux/mfd/syscon.h>
 13#include <linux/mm.h>
 14#include <linux/module.h>
 15#include <linux/of_platform.h>
 16#include <linux/platform_device.h>
 17#include <linux/pm.h>
 18#include <linux/pm_runtime.h>
 19#include <linux/regmap.h>
 20
 21#include <drm/drm_atomic_helper.h>
 22#include <drm/drm_drv.h>
 23#include <drm/drm_fb_cma_helper.h>
 24#include <drm/drm_fb_helper.h>
 25#include <drm/drm_gem_cma_helper.h>
 26#include <drm/drm_irq.h>
 27#include <drm/drm_modeset_helper.h>
 28#include <drm/drm_probe_helper.h>
 29#include <drm/drm_vblank.h>
 30
 31#include "fsl_dcu_drm_crtc.h"
 32#include "fsl_dcu_drm_drv.h"
 33#include "fsl_tcon.h"
 34
 35static int legacyfb_depth = 24;
 36module_param(legacyfb_depth, int, 0444);
 37
 38static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
 39{
 40	if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
 41		return true;
 42
 43	return false;
 44}
 45
 46static const struct regmap_config fsl_dcu_regmap_config = {
 47	.reg_bits = 32,
 48	.reg_stride = 4,
 49	.val_bits = 32,
 50
 51	.volatile_reg = fsl_dcu_drm_is_volatile_reg,
 52};
 53
 54static void fsl_dcu_irq_uninstall(struct drm_device *dev)
 55{
 56	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 57
 58	regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
 59	regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
 60}
 61
 62static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 63{
 64	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 65	int ret;
 66
 67	ret = fsl_dcu_drm_modeset_init(fsl_dev);
 68	if (ret < 0) {
 69		dev_err(dev->dev, "failed to initialize mode setting\n");
 70		return ret;
 71	}
 72
 73	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 74	if (ret < 0) {
 75		dev_err(dev->dev, "failed to initialize vblank\n");
 76		goto done;
 77	}
 78
 79	ret = drm_irq_install(dev, fsl_dev->irq);
 80	if (ret < 0) {
 81		dev_err(dev->dev, "failed to install IRQ handler\n");
 82		goto done;
 83	}
 84
 85	if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
 86	    legacyfb_depth != 32) {
 87		dev_warn(dev->dev,
 88			"Invalid legacyfb_depth.  Defaulting to 24bpp\n");
 89		legacyfb_depth = 24;
 90	}
 91
 92	return 0;
 93done:
 94	drm_kms_helper_poll_fini(dev);
 95
 96	drm_mode_config_cleanup(dev);
 97	drm_irq_uninstall(dev);
 98	dev->dev_private = NULL;
 99
100	return ret;
101}
102
103static void fsl_dcu_unload(struct drm_device *dev)
104{
105	drm_atomic_helper_shutdown(dev);
106	drm_kms_helper_poll_fini(dev);
107
108	drm_mode_config_cleanup(dev);
109	drm_irq_uninstall(dev);
110
111	dev->dev_private = NULL;
112}
113
114static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
115{
116	struct drm_device *dev = arg;
117	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
118	unsigned int int_status;
119	int ret;
120
121	ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
122	if (ret) {
123		dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
124		return IRQ_NONE;
125	}
126
127	if (int_status & DCU_INT_STATUS_VBLANK)
128		drm_handle_vblank(dev, 0);
129
130	regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
131
132	return IRQ_HANDLED;
133}
134
135DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
136
137static struct drm_driver fsl_dcu_drm_driver = {
138	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
139	.load			= fsl_dcu_load,
140	.unload			= fsl_dcu_unload,
141	.irq_handler		= fsl_dcu_drm_irq,
142	.irq_preinstall		= fsl_dcu_irq_uninstall,
143	.irq_uninstall		= fsl_dcu_irq_uninstall,
144	DRM_GEM_CMA_DRIVER_OPS,
145	.fops			= &fsl_dcu_drm_fops,
146	.name			= "fsl-dcu-drm",
147	.desc			= "Freescale DCU DRM",
148	.date			= "20160425",
149	.major			= 1,
150	.minor			= 1,
151};
152
153#ifdef CONFIG_PM_SLEEP
154static int fsl_dcu_drm_pm_suspend(struct device *dev)
155{
156	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
157	int ret;
158
159	if (!fsl_dev)
160		return 0;
161
162	disable_irq(fsl_dev->irq);
163
164	ret = drm_mode_config_helper_suspend(fsl_dev->drm);
165	if (ret) {
166		enable_irq(fsl_dev->irq);
167		return ret;
168	}
169
170	clk_disable_unprepare(fsl_dev->clk);
171
172	return 0;
173}
174
175static int fsl_dcu_drm_pm_resume(struct device *dev)
176{
177	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
178	int ret;
179
180	if (!fsl_dev)
181		return 0;
182
183	ret = clk_prepare_enable(fsl_dev->clk);
184	if (ret < 0) {
185		dev_err(dev, "failed to enable dcu clk\n");
186		return ret;
187	}
188
189	if (fsl_dev->tcon)
190		fsl_tcon_bypass_enable(fsl_dev->tcon);
191	fsl_dcu_drm_init_planes(fsl_dev->drm);
192	enable_irq(fsl_dev->irq);
193
194	drm_mode_config_helper_resume(fsl_dev->drm);
195
196	return 0;
197}
198#endif
199
200static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
201	SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
202};
203
204static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
205	.name = "ls1021a",
206	.total_layer = 16,
207	.max_layer = 4,
208	.layer_regs = LS1021A_LAYER_REG_NUM,
209};
210
211static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
212	.name = "vf610",
213	.total_layer = 64,
214	.max_layer = 6,
215	.layer_regs = VF610_LAYER_REG_NUM,
216};
217
218static const struct of_device_id fsl_dcu_of_match[] = {
219	{
220		.compatible = "fsl,ls1021a-dcu",
221		.data = &fsl_dcu_ls1021a_data,
222	}, {
223		.compatible = "fsl,vf610-dcu",
224		.data = &fsl_dcu_vf610_data,
225	}, {
226	},
227};
228MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
229
230static int fsl_dcu_drm_probe(struct platform_device *pdev)
231{
232	struct fsl_dcu_drm_device *fsl_dev;
233	struct drm_device *drm;
234	struct device *dev = &pdev->dev;
235	struct resource *res;
236	void __iomem *base;
237	struct drm_driver *driver = &fsl_dcu_drm_driver;
238	struct clk *pix_clk_in;
239	char pix_clk_name[32];
240	const char *pix_clk_in_name;
241	const struct of_device_id *id;
242	int ret;
243	u8 div_ratio_shift = 0;
244
245	fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
246	if (!fsl_dev)
247		return -ENOMEM;
248
249	id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
250	if (!id)
251		return -ENODEV;
252	fsl_dev->soc = id->data;
253
254	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
255	base = devm_ioremap_resource(dev, res);
256	if (IS_ERR(base)) {
257		ret = PTR_ERR(base);
258		return ret;
259	}
260
261	fsl_dev->irq = platform_get_irq(pdev, 0);
262	if (fsl_dev->irq < 0) {
263		dev_err(dev, "failed to get irq\n");
264		return fsl_dev->irq;
265	}
266
267	fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
268			&fsl_dcu_regmap_config);
269	if (IS_ERR(fsl_dev->regmap)) {
270		dev_err(dev, "regmap init failed\n");
271		return PTR_ERR(fsl_dev->regmap);
272	}
273
274	fsl_dev->clk = devm_clk_get(dev, "dcu");
275	if (IS_ERR(fsl_dev->clk)) {
276		dev_err(dev, "failed to get dcu clock\n");
277		return PTR_ERR(fsl_dev->clk);
278	}
279	ret = clk_prepare_enable(fsl_dev->clk);
280	if (ret < 0) {
281		dev_err(dev, "failed to enable dcu clk\n");
282		return ret;
283	}
284
285	pix_clk_in = devm_clk_get(dev, "pix");
286	if (IS_ERR(pix_clk_in)) {
287		/* legancy binding, use dcu clock as pixel clock input */
288		pix_clk_in = fsl_dev->clk;
289	}
290
291	if (of_property_read_bool(dev->of_node, "big-endian"))
292		div_ratio_shift = 24;
293
294	pix_clk_in_name = __clk_get_name(pix_clk_in);
295	snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
296	fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
297			pix_clk_in_name, 0, base + DCU_DIV_RATIO,
298			div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
299	if (IS_ERR(fsl_dev->pix_clk)) {
300		dev_err(dev, "failed to register pix clk\n");
301		ret = PTR_ERR(fsl_dev->pix_clk);
302		goto disable_clk;
303	}
304
305	fsl_dev->tcon = fsl_tcon_init(dev);
306
307	drm = drm_dev_alloc(driver, dev);
308	if (IS_ERR(drm)) {
309		ret = PTR_ERR(drm);
310		goto unregister_pix_clk;
311	}
312
313	fsl_dev->dev = dev;
314	fsl_dev->drm = drm;
315	fsl_dev->np = dev->of_node;
316	drm->dev_private = fsl_dev;
317	dev_set_drvdata(dev, fsl_dev);
318
319	ret = drm_dev_register(drm, 0);
320	if (ret < 0)
321		goto put;
322
323	drm_fbdev_generic_setup(drm, legacyfb_depth);
324
325	return 0;
326
327put:
328	drm_dev_put(drm);
329unregister_pix_clk:
330	clk_unregister(fsl_dev->pix_clk);
331disable_clk:
332	clk_disable_unprepare(fsl_dev->clk);
333	return ret;
334}
335
336static int fsl_dcu_drm_remove(struct platform_device *pdev)
337{
338	struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
339
340	drm_dev_unregister(fsl_dev->drm);
341	drm_dev_put(fsl_dev->drm);
342	clk_disable_unprepare(fsl_dev->clk);
343	clk_unregister(fsl_dev->pix_clk);
344
345	return 0;
346}
347
348static struct platform_driver fsl_dcu_drm_platform_driver = {
349	.probe		= fsl_dcu_drm_probe,
350	.remove		= fsl_dcu_drm_remove,
351	.driver		= {
352		.name	= "fsl-dcu",
353		.pm	= &fsl_dcu_drm_pm_ops,
354		.of_match_table = fsl_dcu_of_match,
355	},
356};
357
358module_platform_driver(fsl_dcu_drm_platform_driver);
359
360MODULE_DESCRIPTION("Freescale DCU DRM Driver");
361MODULE_LICENSE("GPL");