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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2010-05-23 10:00:43 -0400
committerPaul Mundt <lethal@linux-sh.org>2010-05-23 19:49:05 -0400
commit9fd04fe34af36344f61ebb24cc653726c231356e (patch)
tree742fc5c9da3c285cad24e4e6f847f826db86c23b /drivers/video
parent1430e006a36da5401ad4420711b5a702ba17afa8 (diff)
sh-mobile: add support for displays, connected over the MIPI bus
Some SH-mobile SoCs have a MIPI DSI controller, that can be used to connect MIPI displays to LCDC. This patch adds a platform driver for SH-mobile MIPI DSI unit. It uses existing hooks in the sh_mobile_lcdcfb.c driver for display activation and deactivation. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Tested-by: Damian Hobson-Garcia <dhobsong@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/Kconfig8
-rw-r--r--drivers/video/Makefile1
-rw-r--r--drivers/video/sh_mipi_dsi.c505
3 files changed, 514 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6e16244f3ed1..773c4a68de89 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1879,6 +1879,13 @@ config FB_W100
1879 1879
1880 If unsure, say N. 1880 If unsure, say N.
1881 1881
1882config SH_MIPI_DSI
1883 tristate
1884 depends on (SUPERH || ARCH_SHMOBILE) && HAVE_CLK
1885
1886config SH_LCD_MIPI_DSI
1887 bool
1888
1882config FB_SH_MOBILE_LCDC 1889config FB_SH_MOBILE_LCDC
1883 tristate "SuperH Mobile LCDC framebuffer support" 1890 tristate "SuperH Mobile LCDC framebuffer support"
1884 depends on FB && (SUPERH || ARCH_SHMOBILE) && HAVE_CLK 1891 depends on FB && (SUPERH || ARCH_SHMOBILE) && HAVE_CLK
@@ -1887,6 +1894,7 @@ config FB_SH_MOBILE_LCDC
1887 select FB_SYS_IMAGEBLIT 1894 select FB_SYS_IMAGEBLIT
1888 select FB_SYS_FOPS 1895 select FB_SYS_FOPS
1889 select FB_DEFERRED_IO 1896 select FB_DEFERRED_IO
1897 select SH_MIPI_DSI if SH_LCD_MIPI_DSI
1890 ---help--- 1898 ---help---
1891 Frame buffer driver for the on-chip SH-Mobile LCD controller. 1899 Frame buffer driver for the on-chip SH-Mobile LCD controller.
1892 1900
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index ddc2af2ba45b..3c3bf867ef18 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -123,6 +123,7 @@ obj-$(CONFIG_FB_IBM_GXT4500) += gxt4500.o
123obj-$(CONFIG_FB_PS3) += ps3fb.o 123obj-$(CONFIG_FB_PS3) += ps3fb.o
124obj-$(CONFIG_FB_SM501) += sm501fb.o 124obj-$(CONFIG_FB_SM501) += sm501fb.o
125obj-$(CONFIG_FB_XILINX) += xilinxfb.o 125obj-$(CONFIG_FB_XILINX) += xilinxfb.o
126obj-$(CONFIG_SH_MIPI_DSI) += sh_mipi_dsi.o
126obj-$(CONFIG_FB_SH_MOBILE_LCDC) += sh_mobile_lcdcfb.o 127obj-$(CONFIG_FB_SH_MOBILE_LCDC) += sh_mobile_lcdcfb.o
127obj-$(CONFIG_FB_OMAP) += omap/ 128obj-$(CONFIG_FB_OMAP) += omap/
128obj-y += omap2/ 129obj-y += omap2/
diff --git a/drivers/video/sh_mipi_dsi.c b/drivers/video/sh_mipi_dsi.c
new file mode 100644
index 000000000000..017ae9f47d36
--- /dev/null
+++ b/drivers/video/sh_mipi_dsi.c
@@ -0,0 +1,505 @@
1/*
2 * Renesas SH-mobile MIPI DSI support
3 *
4 * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 *
6 * This is free software; you can redistribute it and/or modify
7 * it under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/clk.h>
12#include <linux/delay.h>
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/types.h>
19
20#include <video/mipi_display.h>
21#include <video/sh_mipi_dsi.h>
22#include <video/sh_mobile_lcdc.h>
23
24#define CMTSRTCTR 0x80d0
25#define CMTSRTREQ 0x8070
26
27#define DSIINTE 0x0060
28
29/* E.g., sh7372 has 2 MIPI-DSIs - one for each LCDC */
30#define MAX_SH_MIPI_DSI 2
31
32struct sh_mipi {
33 void __iomem *base;
34 struct clk *dsit_clk;
35 struct clk *dsip_clk;
36};
37
38static struct sh_mipi *mipi_dsi[MAX_SH_MIPI_DSI];
39
40/* Protect the above array */
41static DEFINE_MUTEX(array_lock);
42
43static struct sh_mipi *sh_mipi_by_handle(int handle)
44{
45 if (handle >= ARRAY_SIZE(mipi_dsi) || handle < 0)
46 return NULL;
47
48 return mipi_dsi[handle];
49}
50
51static int sh_mipi_send_short(struct sh_mipi *mipi, u8 dsi_cmd,
52 u8 cmd, u8 param)
53{
54 u32 data = (dsi_cmd << 24) | (cmd << 16) | (param << 8);
55 int cnt = 100;
56
57 /* transmit a short packet to LCD panel */
58 iowrite32(1 | data, mipi->base + 0x80d0); /* CMTSRTCTR */
59 iowrite32(1, mipi->base + 0x8070); /* CMTSRTREQ */
60
61 while ((ioread32(mipi->base + 0x8070) & 1) && --cnt)
62 udelay(1);
63
64 return cnt ? 0 : -ETIMEDOUT;
65}
66
67#define LCD_CHAN2MIPI(c) ((c) < LCDC_CHAN_MAINLCD || (c) > LCDC_CHAN_SUBLCD ? \
68 -EINVAL : (c) - 1)
69
70static int sh_mipi_dcs(int handle, u8 cmd)
71{
72 struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
73 if (!mipi)
74 return -ENODEV;
75 return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE, cmd, 0);
76}
77
78static int sh_mipi_dcs_param(int handle, u8 cmd, u8 param)
79{
80 struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
81 if (!mipi)
82 return -ENODEV;
83 return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE_PARAM, cmd,
84 param);
85}
86
87static void sh_mipi_dsi_enable(struct sh_mipi *mipi, bool enable)
88{
89 /*
90 * enable LCDC data tx, transition to LPS after completion of each HS
91 * packet
92 */
93 iowrite32(0x00000002 | enable, mipi->base + 0x8000); /* DTCTR */
94}
95
96static void sh_mipi_shutdown(struct platform_device *pdev)
97{
98 struct sh_mipi *mipi = platform_get_drvdata(pdev);
99
100 sh_mipi_dsi_enable(mipi, false);
101}
102
103static void mipi_display_on(void *arg)
104{
105 struct sh_mipi *mipi = arg;
106
107 sh_mipi_dsi_enable(mipi, true);
108}
109
110static void mipi_display_off(void *arg)
111{
112 struct sh_mipi *mipi = arg;
113
114 sh_mipi_dsi_enable(mipi, false);
115}
116
117static int __init sh_mipi_setup(struct sh_mipi *mipi,
118 struct sh_mipi_dsi_info *pdata)
119{
120 void __iomem *base = mipi->base;
121 struct sh_mobile_lcdc_chan_cfg *ch = pdata->lcd_chan;
122 u32 pctype, datatype, pixfmt;
123 u32 linelength;
124 bool yuv;
125
126 /* Select data format */
127 switch (pdata->data_format) {
128 case MIPI_RGB888:
129 pctype = 0;
130 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
131 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
132 linelength = ch->lcd_cfg.xres * 3;
133 yuv = false;
134 break;
135 case MIPI_RGB565:
136 pctype = 1;
137 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
138 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
139 linelength = ch->lcd_cfg.xres * 2;
140 yuv = false;
141 break;
142 case MIPI_RGB666_LP:
143 pctype = 2;
144 datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
145 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
146 linelength = ch->lcd_cfg.xres * 3;
147 yuv = false;
148 break;
149 case MIPI_RGB666:
150 pctype = 3;
151 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
152 pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
153 linelength = (ch->lcd_cfg.xres * 18 + 7) / 8;
154 yuv = false;
155 break;
156 case MIPI_BGR888:
157 pctype = 8;
158 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
159 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
160 linelength = ch->lcd_cfg.xres * 3;
161 yuv = false;
162 break;
163 case MIPI_BGR565:
164 pctype = 9;
165 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
166 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
167 linelength = ch->lcd_cfg.xres * 2;
168 yuv = false;
169 break;
170 case MIPI_BGR666_LP:
171 pctype = 0xa;
172 datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
173 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
174 linelength = ch->lcd_cfg.xres * 3;
175 yuv = false;
176 break;
177 case MIPI_BGR666:
178 pctype = 0xb;
179 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
180 pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
181 linelength = (ch->lcd_cfg.xres * 18 + 7) / 8;
182 yuv = false;
183 break;
184 case MIPI_YUYV:
185 pctype = 4;
186 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
187 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
188 linelength = ch->lcd_cfg.xres * 2;
189 yuv = true;
190 break;
191 case MIPI_UYVY:
192 pctype = 5;
193 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
194 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
195 linelength = ch->lcd_cfg.xres * 2;
196 yuv = true;
197 break;
198 case MIPI_YUV420_L:
199 pctype = 6;
200 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
201 pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
202 linelength = (ch->lcd_cfg.xres * 12 + 7) / 8;
203 yuv = true;
204 break;
205 case MIPI_YUV420:
206 pctype = 7;
207 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
208 pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
209 /* Length of U/V line */
210 linelength = (ch->lcd_cfg.xres + 1) / 2;
211 yuv = true;
212 break;
213 default:
214 return -EINVAL;
215 }
216
217 if ((yuv && ch->interface_type != YUV422) ||
218 (!yuv && ch->interface_type != RGB24))
219 return -EINVAL;
220
221 /* reset DSI link */
222 iowrite32(0x00000001, base); /* SYSCTRL */
223 /* Hold reset for 100 cycles of the slowest of bus, HS byte and LP clock */
224 udelay(50);
225 iowrite32(0x00000000, base); /* SYSCTRL */
226
227 /* setup DSI link */
228
229 /*
230 * Default = ULPS enable |
231 * Contention detection enabled |
232 * EoT packet transmission enable |
233 * CRC check enable |
234 * ECC check enable
235 * additionally enable first two lanes
236 */
237 iowrite32(0x00003703, base + 0x04); /* SYSCONF */
238 /*
239 * T_wakeup = 0x7000
240 * T_hs-trail = 3
241 * T_hs-prepare = 3
242 * T_clk-trail = 3
243 * T_clk-prepare = 2
244 */
245 iowrite32(0x70003332, base + 0x08); /* TIMSET */
246 /* no responses requested */
247 iowrite32(0x00000000, base + 0x18); /* RESREQSET0 */
248 /* request response to packets of type 0x28 */
249 iowrite32(0x00000100, base + 0x1c); /* RESREQSET1 */
250 /* High-speed transmission timeout, default 0xffffffff */
251 iowrite32(0x0fffffff, base + 0x20); /* HSTTOVSET */
252 /* LP reception timeout, default 0xffffffff */
253 iowrite32(0x0fffffff, base + 0x24); /* LPRTOVSET */
254 /* Turn-around timeout, default 0xffffffff */
255 iowrite32(0x0fffffff, base + 0x28); /* TATOVSET */
256 /* Peripheral reset timeout, default 0xffffffff */
257 iowrite32(0x0fffffff, base + 0x2c); /* PRTOVSET */
258 /* Enable timeout counters */
259 iowrite32(0x00000f00, base + 0x30); /* DSICTRL */
260 /* Interrupts not used, disable all */
261 iowrite32(0, base + DSIINTE);
262 /* DSI-Tx bias on */
263 iowrite32(0x00000001, base + 0x70); /* PHYCTRL */
264 udelay(200);
265 /* Deassert resets, power on, set multiplier */
266 iowrite32(0x03070b01, base + 0x70); /* PHYCTRL */
267
268 /* setup l-bridge */
269
270 /*
271 * Enable transmission of all packets,
272 * transmit LPS after each HS packet completion
273 */
274 iowrite32(0x00000006, base + 0x8000); /* DTCTR */
275 /* VSYNC width = 2 (<< 17) */
276 iowrite32(0x00040000 | (pctype << 12) | datatype, base + 0x8020); /* VMCTR1 */
277 /*
278 * Non-burst mode with sync pulses: VSE and HSE are output,
279 * HSA period allowed, no commands in LP
280 */
281 iowrite32(0x00e00000, base + 0x8024); /* VMCTR2 */
282 /*
283 * 0x660 = 1632 bytes per line (RGB24, 544 pixels: see
284 * sh_mobile_lcdc_info.ch[0].lcd_cfg.xres), HSALEN = 1 - default
285 * (unused, since VMCTR2[HSABM] = 0)
286 */
287 iowrite32(1 | (linelength << 16), base + 0x8028); /* VMLEN1 */
288
289 msleep(5);
290
291 /* setup LCD panel */
292
293 /* cf. drivers/video/omap/lcd_mipid.c */
294 sh_mipi_dcs(ch->chan, MIPI_DCS_EXIT_SLEEP_MODE);
295 msleep(120);
296 /*
297 * [7] - Page Address Mode
298 * [6] - Column Address Mode
299 * [5] - Page / Column Address Mode
300 * [4] - Display Device Line Refresh Order
301 * [3] - RGB/BGR Order
302 * [2] - Display Data Latch Data Order
303 * [1] - Flip Horizontal
304 * [0] - Flip Vertical
305 */
306 sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
307 /* cf. set_data_lines() */
308 sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_PIXEL_FORMAT,
309 pixfmt << 4);
310 sh_mipi_dcs(ch->chan, MIPI_DCS_SET_DISPLAY_ON);
311
312 return 0;
313}
314
315static int __init sh_mipi_probe(struct platform_device *pdev)
316{
317 struct sh_mipi *mipi;
318 struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
319 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
320 unsigned long rate, f_current;
321 int idx = pdev->id, ret;
322 char dsip_clk[] = "dsi.p_clk";
323
324 if (!res || idx >= ARRAY_SIZE(mipi_dsi) || !pdata)
325 return -ENODEV;
326
327 mutex_lock(&array_lock);
328 if (idx < 0)
329 for (idx = 0; idx < ARRAY_SIZE(mipi_dsi) && mipi_dsi[idx]; idx++)
330 ;
331
332 if (idx == ARRAY_SIZE(mipi_dsi)) {
333 ret = -EBUSY;
334 goto efindslot;
335 }
336
337 mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
338 if (!mipi) {
339 ret = -ENOMEM;
340 goto ealloc;
341 }
342
343 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
344 dev_err(&pdev->dev, "MIPI register region already claimed\n");
345 ret = -EBUSY;
346 goto ereqreg;
347 }
348
349 mipi->base = ioremap(res->start, resource_size(res));
350 if (!mipi->base) {
351 ret = -ENOMEM;
352 goto emap;
353 }
354
355 mipi->dsit_clk = clk_get(&pdev->dev, "dsit_clk");
356 if (IS_ERR(mipi->dsit_clk)) {
357 ret = PTR_ERR(mipi->dsit_clk);
358 goto eclktget;
359 }
360
361 f_current = clk_get_rate(mipi->dsit_clk);
362 /* 80MHz required by the datasheet */
363 rate = clk_round_rate(mipi->dsit_clk, 80000000);
364 if (rate > 0 && rate != f_current)
365 ret = clk_set_rate(mipi->dsit_clk, rate);
366 else
367 ret = rate;
368 if (ret < 0)
369 goto esettrate;
370
371 dev_dbg(&pdev->dev, "DSI-T clk %lu -> %lu\n", f_current, rate);
372
373 sprintf(dsip_clk, "dsi%1.1dp_clk", idx);
374 mipi->dsip_clk = clk_get(&pdev->dev, dsip_clk);
375 if (IS_ERR(mipi->dsip_clk)) {
376 ret = PTR_ERR(mipi->dsip_clk);
377 goto eclkpget;
378 }
379
380 f_current = clk_get_rate(mipi->dsip_clk);
381 /* Between 10 and 50MHz */
382 rate = clk_round_rate(mipi->dsip_clk, 24000000);
383 if (rate > 0 && rate != f_current)
384 ret = clk_set_rate(mipi->dsip_clk, rate);
385 else
386 ret = rate;
387 if (ret < 0)
388 goto esetprate;
389
390 dev_dbg(&pdev->dev, "DSI-P clk %lu -> %lu\n", f_current, rate);
391
392 msleep(10);
393
394 ret = clk_enable(mipi->dsit_clk);
395 if (ret < 0)
396 goto eclkton;
397
398 ret = clk_enable(mipi->dsip_clk);
399 if (ret < 0)
400 goto eclkpon;
401
402 mipi_dsi[idx] = mipi;
403
404 ret = sh_mipi_setup(mipi, pdata);
405 if (ret < 0)
406 goto emipisetup;
407
408 mutex_unlock(&array_lock);
409 platform_set_drvdata(pdev, mipi);
410
411 /* Set up LCDC callbacks */
412 pdata->lcd_chan->board_cfg.board_data = mipi;
413 pdata->lcd_chan->board_cfg.display_on = mipi_display_on;
414 pdata->lcd_chan->board_cfg.display_off = mipi_display_off;
415
416 return 0;
417
418emipisetup:
419 mipi_dsi[idx] = NULL;
420 clk_disable(mipi->dsip_clk);
421eclkpon:
422 clk_disable(mipi->dsit_clk);
423eclkton:
424esetprate:
425 clk_put(mipi->dsip_clk);
426eclkpget:
427esettrate:
428 clk_put(mipi->dsit_clk);
429eclktget:
430 iounmap(mipi->base);
431emap:
432 release_mem_region(res->start, resource_size(res));
433ereqreg:
434 kfree(mipi);
435ealloc:
436efindslot:
437 mutex_unlock(&array_lock);
438
439 return ret;
440}
441
442static int __exit sh_mipi_remove(struct platform_device *pdev)
443{
444 struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
445 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
446 struct sh_mipi *mipi = platform_get_drvdata(pdev);
447 int i, ret;
448
449 mutex_lock(&array_lock);
450
451 for (i = 0; i < ARRAY_SIZE(mipi_dsi) && mipi_dsi[i] != mipi; i++)
452 ;
453
454 if (i == ARRAY_SIZE(mipi_dsi)) {
455 ret = -EINVAL;
456 } else {
457 ret = 0;
458 mipi_dsi[i] = NULL;
459 }
460
461 mutex_unlock(&array_lock);
462
463 if (ret < 0)
464 return ret;
465
466 pdata->lcd_chan->board_cfg.display_on = NULL;
467 pdata->lcd_chan->board_cfg.display_off = NULL;
468 pdata->lcd_chan->board_cfg.board_data = NULL;
469
470 clk_disable(mipi->dsip_clk);
471 clk_disable(mipi->dsit_clk);
472 clk_put(mipi->dsit_clk);
473 clk_put(mipi->dsip_clk);
474 iounmap(mipi->base);
475 if (res)
476 release_mem_region(res->start, resource_size(res));
477 platform_set_drvdata(pdev, NULL);
478 kfree(mipi);
479
480 return 0;
481}
482
483static struct platform_driver sh_mipi_driver = {
484 .remove = __exit_p(sh_mipi_remove),
485 .shutdown = sh_mipi_shutdown,
486 .driver = {
487 .name = "sh-mipi-dsi",
488 },
489};
490
491static int __init sh_mipi_init(void)
492{
493 return platform_driver_probe(&sh_mipi_driver, sh_mipi_probe);
494}
495module_init(sh_mipi_init);
496
497static void __exit sh_mipi_exit(void)
498{
499 platform_driver_unregister(&sh_mipi_driver);
500}
501module_exit(sh_mipi_exit);
502
503MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
504MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
505MODULE_LICENSE("GPL v2");