1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Toppoly TD028TTEC1 panel support
4  *
5  * Copyright (C) 2008 Nokia Corporation
6  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7  *
8  * Neo 1973 code (jbt6k74.c):
9  * Copyright (C) 2006-2007 by OpenMoko, Inc.
10  * Author: Harald Welte <laforge@openmoko.org>
11  *
12  * Ported and adapted from Neo 1973 U-Boot by:
13  * H. Nikolaus Schaller <hns@goldelico.com>
14  */
15 
16 #include <linux/module.h>
17 #include <linux/delay.h>
18 #include <linux/spi/spi.h>
19 #include <linux/gpio.h>
20 #include <video/omapfb_dss.h>
21 
22 struct panel_drv_data {
23 	struct omap_dss_device dssdev;
24 	struct omap_dss_device *in;
25 
26 	int data_lines;
27 
28 	struct omap_video_timings videomode;
29 
30 	struct spi_device *spi_dev;
31 };
32 
33 static const struct omap_video_timings td028ttec1_panel_timings = {
34 	.x_res		= 480,
35 	.y_res		= 640,
36 	.pixelclock	= 22153000,
37 	.hfp		= 24,
38 	.hsw		= 8,
39 	.hbp		= 8,
40 	.vfp		= 4,
41 	.vsw		= 2,
42 	.vbp		= 2,
43 
44 	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
45 	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
46 
47 	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_FALLING_EDGE,
48 	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
49 	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
50 };
51 
52 #define JBT_COMMAND	0x000
53 #define JBT_DATA	0x100
54 
jbt_ret_write_0(struct panel_drv_data * ddata,u8 reg)55 static int jbt_ret_write_0(struct panel_drv_data *ddata, u8 reg)
56 {
57 	int rc;
58 	u16 tx_buf = JBT_COMMAND | reg;
59 
60 	rc = spi_write(ddata->spi_dev, (u8 *)&tx_buf,
61 			1*sizeof(u16));
62 	if (rc != 0)
63 		dev_err(&ddata->spi_dev->dev,
64 			"jbt_ret_write_0 spi_write ret %d\n", rc);
65 
66 	return rc;
67 }
68 
jbt_reg_write_1(struct panel_drv_data * ddata,u8 reg,u8 data)69 static int jbt_reg_write_1(struct panel_drv_data *ddata, u8 reg, u8 data)
70 {
71 	int rc;
72 	u16 tx_buf[2];
73 
74 	tx_buf[0] = JBT_COMMAND | reg;
75 	tx_buf[1] = JBT_DATA | data;
76 	rc = spi_write(ddata->spi_dev, (u8 *)tx_buf,
77 			2*sizeof(u16));
78 	if (rc != 0)
79 		dev_err(&ddata->spi_dev->dev,
80 			"jbt_reg_write_1 spi_write ret %d\n", rc);
81 
82 	return rc;
83 }
84 
jbt_reg_write_2(struct panel_drv_data * ddata,u8 reg,u16 data)85 static int jbt_reg_write_2(struct panel_drv_data *ddata, u8 reg, u16 data)
86 {
87 	int rc;
88 	u16 tx_buf[3];
89 
90 	tx_buf[0] = JBT_COMMAND | reg;
91 	tx_buf[1] = JBT_DATA | (data >> 8);
92 	tx_buf[2] = JBT_DATA | (data & 0xff);
93 
94 	rc = spi_write(ddata->spi_dev, (u8 *)tx_buf,
95 			3*sizeof(u16));
96 
97 	if (rc != 0)
98 		dev_err(&ddata->spi_dev->dev,
99 			"jbt_reg_write_2 spi_write ret %d\n", rc);
100 
101 	return rc;
102 }
103 
104 enum jbt_register {
105 	JBT_REG_SLEEP_IN		= 0x10,
106 	JBT_REG_SLEEP_OUT		= 0x11,
107 
108 	JBT_REG_DISPLAY_OFF		= 0x28,
109 	JBT_REG_DISPLAY_ON		= 0x29,
110 
111 	JBT_REG_RGB_FORMAT		= 0x3a,
112 	JBT_REG_QUAD_RATE		= 0x3b,
113 
114 	JBT_REG_POWER_ON_OFF		= 0xb0,
115 	JBT_REG_BOOSTER_OP		= 0xb1,
116 	JBT_REG_BOOSTER_MODE		= 0xb2,
117 	JBT_REG_BOOSTER_FREQ		= 0xb3,
118 	JBT_REG_OPAMP_SYSCLK		= 0xb4,
119 	JBT_REG_VSC_VOLTAGE		= 0xb5,
120 	JBT_REG_VCOM_VOLTAGE		= 0xb6,
121 	JBT_REG_EXT_DISPL		= 0xb7,
122 	JBT_REG_OUTPUT_CONTROL		= 0xb8,
123 	JBT_REG_DCCLK_DCEV		= 0xb9,
124 	JBT_REG_DISPLAY_MODE1		= 0xba,
125 	JBT_REG_DISPLAY_MODE2		= 0xbb,
126 	JBT_REG_DISPLAY_MODE		= 0xbc,
127 	JBT_REG_ASW_SLEW		= 0xbd,
128 	JBT_REG_DUMMY_DISPLAY		= 0xbe,
129 	JBT_REG_DRIVE_SYSTEM		= 0xbf,
130 
131 	JBT_REG_SLEEP_OUT_FR_A		= 0xc0,
132 	JBT_REG_SLEEP_OUT_FR_B		= 0xc1,
133 	JBT_REG_SLEEP_OUT_FR_C		= 0xc2,
134 	JBT_REG_SLEEP_IN_LCCNT_D	= 0xc3,
135 	JBT_REG_SLEEP_IN_LCCNT_E	= 0xc4,
136 	JBT_REG_SLEEP_IN_LCCNT_F	= 0xc5,
137 	JBT_REG_SLEEP_IN_LCCNT_G	= 0xc6,
138 
139 	JBT_REG_GAMMA1_FINE_1		= 0xc7,
140 	JBT_REG_GAMMA1_FINE_2		= 0xc8,
141 	JBT_REG_GAMMA1_INCLINATION	= 0xc9,
142 	JBT_REG_GAMMA1_BLUE_OFFSET	= 0xca,
143 
144 	JBT_REG_BLANK_CONTROL		= 0xcf,
145 	JBT_REG_BLANK_TH_TV		= 0xd0,
146 	JBT_REG_CKV_ON_OFF		= 0xd1,
147 	JBT_REG_CKV_1_2			= 0xd2,
148 	JBT_REG_OEV_TIMING		= 0xd3,
149 	JBT_REG_ASW_TIMING_1		= 0xd4,
150 	JBT_REG_ASW_TIMING_2		= 0xd5,
151 
152 	JBT_REG_HCLOCK_VGA		= 0xec,
153 	JBT_REG_HCLOCK_QVGA		= 0xed,
154 };
155 
156 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
157 
td028ttec1_panel_connect(struct omap_dss_device * dssdev)158 static int td028ttec1_panel_connect(struct omap_dss_device *dssdev)
159 {
160 	struct panel_drv_data *ddata = to_panel_data(dssdev);
161 	struct omap_dss_device *in = ddata->in;
162 	int r;
163 
164 	if (omapdss_device_is_connected(dssdev))
165 		return 0;
166 
167 	r = in->ops.dpi->connect(in, dssdev);
168 	if (r)
169 		return r;
170 
171 	return 0;
172 }
173 
td028ttec1_panel_disconnect(struct omap_dss_device * dssdev)174 static void td028ttec1_panel_disconnect(struct omap_dss_device *dssdev)
175 {
176 	struct panel_drv_data *ddata = to_panel_data(dssdev);
177 	struct omap_dss_device *in = ddata->in;
178 
179 	if (!omapdss_device_is_connected(dssdev))
180 		return;
181 
182 	in->ops.dpi->disconnect(in, dssdev);
183 }
184 
td028ttec1_panel_enable(struct omap_dss_device * dssdev)185 static int td028ttec1_panel_enable(struct omap_dss_device *dssdev)
186 {
187 	struct panel_drv_data *ddata = to_panel_data(dssdev);
188 	struct omap_dss_device *in = ddata->in;
189 	int r;
190 
191 	if (!omapdss_device_is_connected(dssdev))
192 		return -ENODEV;
193 
194 	if (omapdss_device_is_enabled(dssdev))
195 		return 0;
196 
197 	if (ddata->data_lines)
198 		in->ops.dpi->set_data_lines(in, ddata->data_lines);
199 	in->ops.dpi->set_timings(in, &ddata->videomode);
200 
201 	r = in->ops.dpi->enable(in);
202 	if (r)
203 		return r;
204 
205 	dev_dbg(dssdev->dev, "td028ttec1_panel_enable() - state %d\n",
206 		dssdev->state);
207 
208 	/* three times command zero */
209 	r |= jbt_ret_write_0(ddata, 0x00);
210 	usleep_range(1000, 2000);
211 	r |= jbt_ret_write_0(ddata, 0x00);
212 	usleep_range(1000, 2000);
213 	r |= jbt_ret_write_0(ddata, 0x00);
214 	usleep_range(1000, 2000);
215 
216 	if (r) {
217 		dev_warn(dssdev->dev, "transfer error\n");
218 		goto transfer_err;
219 	}
220 
221 	/* deep standby out */
222 	r |= jbt_reg_write_1(ddata, JBT_REG_POWER_ON_OFF, 0x17);
223 
224 	/* RGB I/F on, RAM write off, QVGA through, SIGCON enable */
225 	r |= jbt_reg_write_1(ddata, JBT_REG_DISPLAY_MODE, 0x80);
226 
227 	/* Quad mode off */
228 	r |= jbt_reg_write_1(ddata, JBT_REG_QUAD_RATE, 0x00);
229 
230 	/* AVDD on, XVDD on */
231 	r |= jbt_reg_write_1(ddata, JBT_REG_POWER_ON_OFF, 0x16);
232 
233 	/* Output control */
234 	r |= jbt_reg_write_2(ddata, JBT_REG_OUTPUT_CONTROL, 0xfff9);
235 
236 	/* Sleep mode off */
237 	r |= jbt_ret_write_0(ddata, JBT_REG_SLEEP_OUT);
238 
239 	/* at this point we have like 50% grey */
240 
241 	/* initialize register set */
242 	r |= jbt_reg_write_1(ddata, JBT_REG_DISPLAY_MODE1, 0x01);
243 	r |= jbt_reg_write_1(ddata, JBT_REG_DISPLAY_MODE2, 0x00);
244 	r |= jbt_reg_write_1(ddata, JBT_REG_RGB_FORMAT, 0x60);
245 	r |= jbt_reg_write_1(ddata, JBT_REG_DRIVE_SYSTEM, 0x10);
246 	r |= jbt_reg_write_1(ddata, JBT_REG_BOOSTER_OP, 0x56);
247 	r |= jbt_reg_write_1(ddata, JBT_REG_BOOSTER_MODE, 0x33);
248 	r |= jbt_reg_write_1(ddata, JBT_REG_BOOSTER_FREQ, 0x11);
249 	r |= jbt_reg_write_1(ddata, JBT_REG_BOOSTER_FREQ, 0x11);
250 	r |= jbt_reg_write_1(ddata, JBT_REG_OPAMP_SYSCLK, 0x02);
251 	r |= jbt_reg_write_1(ddata, JBT_REG_VSC_VOLTAGE, 0x2b);
252 	r |= jbt_reg_write_1(ddata, JBT_REG_VCOM_VOLTAGE, 0x40);
253 	r |= jbt_reg_write_1(ddata, JBT_REG_EXT_DISPL, 0x03);
254 	r |= jbt_reg_write_1(ddata, JBT_REG_DCCLK_DCEV, 0x04);
255 	/*
256 	 * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
257 	 * to avoid red / blue flicker
258 	 */
259 	r |= jbt_reg_write_1(ddata, JBT_REG_ASW_SLEW, 0x04);
260 	r |= jbt_reg_write_1(ddata, JBT_REG_DUMMY_DISPLAY, 0x00);
261 
262 	r |= jbt_reg_write_1(ddata, JBT_REG_SLEEP_OUT_FR_A, 0x11);
263 	r |= jbt_reg_write_1(ddata, JBT_REG_SLEEP_OUT_FR_B, 0x11);
264 	r |= jbt_reg_write_1(ddata, JBT_REG_SLEEP_OUT_FR_C, 0x11);
265 	r |= jbt_reg_write_2(ddata, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040);
266 	r |= jbt_reg_write_2(ddata, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0);
267 	r |= jbt_reg_write_2(ddata, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020);
268 	r |= jbt_reg_write_2(ddata, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0);
269 
270 	r |= jbt_reg_write_2(ddata, JBT_REG_GAMMA1_FINE_1, 0x5533);
271 	r |= jbt_reg_write_1(ddata, JBT_REG_GAMMA1_FINE_2, 0x00);
272 	r |= jbt_reg_write_1(ddata, JBT_REG_GAMMA1_INCLINATION, 0x00);
273 	r |= jbt_reg_write_1(ddata, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00);
274 
275 	r |= jbt_reg_write_2(ddata, JBT_REG_HCLOCK_VGA, 0x1f0);
276 	r |= jbt_reg_write_1(ddata, JBT_REG_BLANK_CONTROL, 0x02);
277 	r |= jbt_reg_write_2(ddata, JBT_REG_BLANK_TH_TV, 0x0804);
278 
279 	r |= jbt_reg_write_1(ddata, JBT_REG_CKV_ON_OFF, 0x01);
280 	r |= jbt_reg_write_2(ddata, JBT_REG_CKV_1_2, 0x0000);
281 
282 	r |= jbt_reg_write_2(ddata, JBT_REG_OEV_TIMING, 0x0d0e);
283 	r |= jbt_reg_write_2(ddata, JBT_REG_ASW_TIMING_1, 0x11a4);
284 	r |= jbt_reg_write_1(ddata, JBT_REG_ASW_TIMING_2, 0x0e);
285 
286 	r |= jbt_ret_write_0(ddata, JBT_REG_DISPLAY_ON);
287 
288 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
289 
290 transfer_err:
291 
292 	return r ? -EIO : 0;
293 }
294 
td028ttec1_panel_disable(struct omap_dss_device * dssdev)295 static void td028ttec1_panel_disable(struct omap_dss_device *dssdev)
296 {
297 	struct panel_drv_data *ddata = to_panel_data(dssdev);
298 	struct omap_dss_device *in = ddata->in;
299 
300 	if (!omapdss_device_is_enabled(dssdev))
301 		return;
302 
303 	dev_dbg(dssdev->dev, "td028ttec1_panel_disable()\n");
304 
305 	jbt_ret_write_0(ddata, JBT_REG_DISPLAY_OFF);
306 	jbt_reg_write_2(ddata, JBT_REG_OUTPUT_CONTROL, 0x8002);
307 	jbt_ret_write_0(ddata, JBT_REG_SLEEP_IN);
308 	jbt_reg_write_1(ddata, JBT_REG_POWER_ON_OFF, 0x00);
309 
310 	in->ops.dpi->disable(in);
311 
312 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
313 }
314 
td028ttec1_panel_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)315 static void td028ttec1_panel_set_timings(struct omap_dss_device *dssdev,
316 		struct omap_video_timings *timings)
317 {
318 	struct panel_drv_data *ddata = to_panel_data(dssdev);
319 	struct omap_dss_device *in = ddata->in;
320 
321 	ddata->videomode = *timings;
322 	dssdev->panel.timings = *timings;
323 
324 	in->ops.dpi->set_timings(in, timings);
325 }
326 
td028ttec1_panel_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)327 static void td028ttec1_panel_get_timings(struct omap_dss_device *dssdev,
328 		struct omap_video_timings *timings)
329 {
330 	struct panel_drv_data *ddata = to_panel_data(dssdev);
331 
332 	*timings = ddata->videomode;
333 }
334 
td028ttec1_panel_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)335 static int td028ttec1_panel_check_timings(struct omap_dss_device *dssdev,
336 		struct omap_video_timings *timings)
337 {
338 	struct panel_drv_data *ddata = to_panel_data(dssdev);
339 	struct omap_dss_device *in = ddata->in;
340 
341 	return in->ops.dpi->check_timings(in, timings);
342 }
343 
344 static struct omap_dss_driver td028ttec1_ops = {
345 	.connect	= td028ttec1_panel_connect,
346 	.disconnect	= td028ttec1_panel_disconnect,
347 
348 	.enable		= td028ttec1_panel_enable,
349 	.disable	= td028ttec1_panel_disable,
350 
351 	.set_timings	= td028ttec1_panel_set_timings,
352 	.get_timings	= td028ttec1_panel_get_timings,
353 	.check_timings	= td028ttec1_panel_check_timings,
354 };
355 
td028ttec1_probe_of(struct spi_device * spi)356 static int td028ttec1_probe_of(struct spi_device *spi)
357 {
358 	struct device_node *node = spi->dev.of_node;
359 	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
360 	struct omap_dss_device *in;
361 
362 	in = omapdss_of_find_source_for_first_ep(node);
363 	if (IS_ERR(in)) {
364 		dev_err(&spi->dev, "failed to find video source\n");
365 		return PTR_ERR(in);
366 	}
367 
368 	ddata->in = in;
369 
370 	return 0;
371 }
372 
td028ttec1_panel_probe(struct spi_device * spi)373 static int td028ttec1_panel_probe(struct spi_device *spi)
374 {
375 	struct panel_drv_data *ddata;
376 	struct omap_dss_device *dssdev;
377 	int r;
378 
379 	dev_dbg(&spi->dev, "%s\n", __func__);
380 
381 	if (!spi->dev.of_node)
382 		return -ENODEV;
383 
384 	spi->bits_per_word = 9;
385 	spi->mode = SPI_MODE_3;
386 
387 	r = spi_setup(spi);
388 	if (r < 0) {
389 		dev_err(&spi->dev, "spi_setup failed: %d\n", r);
390 		return r;
391 	}
392 
393 	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
394 	if (ddata == NULL)
395 		return -ENOMEM;
396 
397 	dev_set_drvdata(&spi->dev, ddata);
398 
399 	ddata->spi_dev = spi;
400 
401 	r = td028ttec1_probe_of(spi);
402 	if (r)
403 		return r;
404 
405 	ddata->videomode = td028ttec1_panel_timings;
406 
407 	dssdev = &ddata->dssdev;
408 	dssdev->dev = &spi->dev;
409 	dssdev->driver = &td028ttec1_ops;
410 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
411 	dssdev->owner = THIS_MODULE;
412 	dssdev->panel.timings = ddata->videomode;
413 	dssdev->phy.dpi.data_lines = ddata->data_lines;
414 
415 	r = omapdss_register_display(dssdev);
416 	if (r) {
417 		dev_err(&spi->dev, "Failed to register panel\n");
418 		goto err_reg;
419 	}
420 
421 	return 0;
422 
423 err_reg:
424 	omap_dss_put_device(ddata->in);
425 	return r;
426 }
427 
td028ttec1_panel_remove(struct spi_device * spi)428 static void td028ttec1_panel_remove(struct spi_device *spi)
429 {
430 	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
431 	struct omap_dss_device *dssdev = &ddata->dssdev;
432 	struct omap_dss_device *in = ddata->in;
433 
434 	dev_dbg(&ddata->spi_dev->dev, "%s\n", __func__);
435 
436 	omapdss_unregister_display(dssdev);
437 
438 	td028ttec1_panel_disable(dssdev);
439 	td028ttec1_panel_disconnect(dssdev);
440 
441 	omap_dss_put_device(in);
442 }
443 
444 static const struct of_device_id td028ttec1_of_match[] = {
445 	{ .compatible = "omapdss,tpo,td028ttec1", },
446 	/* keep to not break older DTB */
447 	{ .compatible = "omapdss,toppoly,td028ttec1", },
448 	{},
449 };
450 
451 MODULE_DEVICE_TABLE(of, td028ttec1_of_match);
452 
453 static const struct spi_device_id td028ttec1_ids[] = {
454 	{ "toppoly,td028ttec1", 0 },
455 	{ "tpo,td028ttec1", 0},
456 	{ /* sentinel */ }
457 };
458 
459 MODULE_DEVICE_TABLE(spi, td028ttec1_ids);
460 
461 static struct spi_driver td028ttec1_spi_driver = {
462 	.probe		= td028ttec1_panel_probe,
463 	.remove		= td028ttec1_panel_remove,
464 	.id_table	= td028ttec1_ids,
465 
466 	.driver         = {
467 		.name   = "panel-tpo-td028ttec1",
468 		.of_match_table = td028ttec1_of_match,
469 		.suppress_bind_attrs = true,
470 	},
471 };
472 
473 module_spi_driver(td028ttec1_spi_driver);
474 
475 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
476 MODULE_DESCRIPTION("Toppoly TD028TTEC1 panel driver");
477 MODULE_LICENSE("GPL");
478