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1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/amba/clcd-regs.h>
4#include <linux/bitops.h>
5#include <linux/device.h>
6#include <linux/mfd/syscon.h>
7#include <linux/module.h>
8#include <linux/of.h>
9#include <linux/of_platform.h>
10#include <linux/regmap.h>
11
12#include "pl111_versatile.h"
13#include "pl111_vexpress.h"
14#include "pl111_drm.h"
15
16static struct regmap *versatile_syscon_map;
17
18/*
19 * We detect the different syscon types from the compatible strings.
20 */
21enum versatile_clcd {
22 INTEGRATOR_CLCD_CM,
23 VERSATILE_CLCD,
24 REALVIEW_CLCD_EB,
25 REALVIEW_CLCD_PB1176,
26 REALVIEW_CLCD_PB11MP,
27 REALVIEW_CLCD_PBA8,
28 REALVIEW_CLCD_PBX,
29 VEXPRESS_CLCD_V2M,
30};
31
32static const struct of_device_id versatile_clcd_of_match[] = {
33 {
34 .compatible = "arm,core-module-integrator",
35 .data = (void *)INTEGRATOR_CLCD_CM,
36 },
37 {
38 .compatible = "arm,versatile-sysreg",
39 .data = (void *)VERSATILE_CLCD,
40 },
41 {
42 .compatible = "arm,realview-eb-syscon",
43 .data = (void *)REALVIEW_CLCD_EB,
44 },
45 {
46 .compatible = "arm,realview-pb1176-syscon",
47 .data = (void *)REALVIEW_CLCD_PB1176,
48 },
49 {
50 .compatible = "arm,realview-pb11mp-syscon",
51 .data = (void *)REALVIEW_CLCD_PB11MP,
52 },
53 {
54 .compatible = "arm,realview-pba8-syscon",
55 .data = (void *)REALVIEW_CLCD_PBA8,
56 },
57 {
58 .compatible = "arm,realview-pbx-syscon",
59 .data = (void *)REALVIEW_CLCD_PBX,
60 },
61 {
62 .compatible = "arm,vexpress-muxfpga",
63 .data = (void *)VEXPRESS_CLCD_V2M,
64 },
65 {},
66};
67
68/*
69 * Core module CLCD control on the Integrator/CP, bits
70 * 8 thru 19 of the CM_CONTROL register controls a bunch
71 * of CLCD settings.
72 */
73#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
74#define INTEGRATOR_CLCD_LCDBIASEN BIT(8)
75#define INTEGRATOR_CLCD_LCDBIASUP BIT(9)
76#define INTEGRATOR_CLCD_LCDBIASDN BIT(10)
77/* Bits 11,12,13 controls the LCD or VGA bridge type */
78#define INTEGRATOR_CLCD_LCDMUX_LCD24 BIT(11)
79#define INTEGRATOR_CLCD_LCDMUX_SHARP (BIT(11)|BIT(12))
80#define INTEGRATOR_CLCD_LCDMUX_VGA555 BIT(13)
81#define INTEGRATOR_CLCD_LCDMUX_VGA24 (BIT(11)|BIT(12)|BIT(13))
82#define INTEGRATOR_CLCD_LCD0_EN BIT(14)
83#define INTEGRATOR_CLCD_LCD1_EN BIT(15)
84/* R/L flip on Sharp */
85#define INTEGRATOR_CLCD_LCD_STATIC1 BIT(16)
86/* U/D flip on Sharp */
87#define INTEGRATOR_CLCD_LCD_STATIC2 BIT(17)
88/* No connection on Sharp */
89#define INTEGRATOR_CLCD_LCD_STATIC BIT(18)
90/* 0 = 24bit VGA, 1 = 18bit VGA */
91#define INTEGRATOR_CLCD_LCD_N24BITEN BIT(19)
92
93#define INTEGRATOR_CLCD_MASK GENMASK(19, 8)
94
95static void pl111_integrator_enable(struct drm_device *drm, u32 format)
96{
97 u32 val;
98
99 dev_info(drm->dev, "enable Integrator CLCD connectors\n");
100
101 /* FIXME: really needed? */
102 val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
103 INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;
104
105 switch (format) {
106 case DRM_FORMAT_XBGR8888:
107 case DRM_FORMAT_XRGB8888:
108 /* 24bit formats */
109 val |= INTEGRATOR_CLCD_LCDMUX_VGA24;
110 break;
111 case DRM_FORMAT_XBGR1555:
112 case DRM_FORMAT_XRGB1555:
113 /* Pseudocolor, RGB555, BGR555 */
114 val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
115 break;
116 default:
117 dev_err(drm->dev, "unhandled format on Integrator 0x%08x\n",
118 format);
119 break;
120 }
121
122 regmap_update_bits(versatile_syscon_map,
123 INTEGRATOR_HDR_CTRL_OFFSET,
124 INTEGRATOR_CLCD_MASK,
125 val);
126}
127
128/*
129 * This configuration register in the Versatile and RealView
130 * family is uniformly present but appears more and more
131 * unutilized starting with the RealView series.
132 */
133#define SYS_CLCD 0x50
134#define SYS_CLCD_MODE_MASK (BIT(0)|BIT(1))
135#define SYS_CLCD_MODE_888 0
136#define SYS_CLCD_MODE_5551 BIT(0)
137#define SYS_CLCD_MODE_565_R_LSB BIT(1)
138#define SYS_CLCD_MODE_565_B_LSB (BIT(0)|BIT(1))
139#define SYS_CLCD_CONNECTOR_MASK (BIT(2)|BIT(3)|BIT(4)|BIT(5))
140#define SYS_CLCD_NLCDIOON BIT(2)
141#define SYS_CLCD_VDDPOSSWITCH BIT(3)
142#define SYS_CLCD_PWR3V5SWITCH BIT(4)
143#define SYS_CLCD_VDDNEGSWITCH BIT(5)
144
145static void pl111_versatile_disable(struct drm_device *drm)
146{
147 dev_info(drm->dev, "disable Versatile CLCD connectors\n");
148 regmap_update_bits(versatile_syscon_map,
149 SYS_CLCD,
150 SYS_CLCD_CONNECTOR_MASK,
151 0);
152}
153
154static void pl111_versatile_enable(struct drm_device *drm, u32 format)
155{
156 u32 val = 0;
157
158 dev_info(drm->dev, "enable Versatile CLCD connectors\n");
159
160 switch (format) {
161 case DRM_FORMAT_ABGR8888:
162 case DRM_FORMAT_XBGR8888:
163 case DRM_FORMAT_ARGB8888:
164 case DRM_FORMAT_XRGB8888:
165 val |= SYS_CLCD_MODE_888;
166 break;
167 case DRM_FORMAT_BGR565:
168 val |= SYS_CLCD_MODE_565_R_LSB;
169 break;
170 case DRM_FORMAT_RGB565:
171 val |= SYS_CLCD_MODE_565_B_LSB;
172 break;
173 case DRM_FORMAT_ABGR1555:
174 case DRM_FORMAT_XBGR1555:
175 case DRM_FORMAT_ARGB1555:
176 case DRM_FORMAT_XRGB1555:
177 val |= SYS_CLCD_MODE_5551;
178 break;
179 default:
180 dev_err(drm->dev, "unhandled format on Versatile 0x%08x\n",
181 format);
182 break;
183 }
184
185 /* Set up the MUX */
186 regmap_update_bits(versatile_syscon_map,
187 SYS_CLCD,
188 SYS_CLCD_MODE_MASK,
189 val);
190
191 /* Then enable the display */
192 regmap_update_bits(versatile_syscon_map,
193 SYS_CLCD,
194 SYS_CLCD_CONNECTOR_MASK,
195 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
196}
197
198static void pl111_realview_clcd_disable(struct drm_device *drm)
199{
200 dev_info(drm->dev, "disable RealView CLCD connectors\n");
201 regmap_update_bits(versatile_syscon_map,
202 SYS_CLCD,
203 SYS_CLCD_CONNECTOR_MASK,
204 0);
205}
206
207static void pl111_realview_clcd_enable(struct drm_device *drm, u32 format)
208{
209 dev_info(drm->dev, "enable RealView CLCD connectors\n");
210 regmap_update_bits(versatile_syscon_map,
211 SYS_CLCD,
212 SYS_CLCD_CONNECTOR_MASK,
213 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
214}
215
216/* PL110 pixel formats for Integrator, vanilla PL110 */
217static const u32 pl110_integrator_pixel_formats[] = {
218 DRM_FORMAT_ABGR8888,
219 DRM_FORMAT_XBGR8888,
220 DRM_FORMAT_ARGB8888,
221 DRM_FORMAT_XRGB8888,
222 DRM_FORMAT_ABGR1555,
223 DRM_FORMAT_XBGR1555,
224 DRM_FORMAT_ARGB1555,
225 DRM_FORMAT_XRGB1555,
226};
227
228/* Extended PL110 pixel formats for Integrator and Versatile */
229static const u32 pl110_versatile_pixel_formats[] = {
230 DRM_FORMAT_ABGR8888,
231 DRM_FORMAT_XBGR8888,
232 DRM_FORMAT_ARGB8888,
233 DRM_FORMAT_XRGB8888,
234 DRM_FORMAT_BGR565, /* Uses external PLD */
235 DRM_FORMAT_RGB565, /* Uses external PLD */
236 DRM_FORMAT_ABGR1555,
237 DRM_FORMAT_XBGR1555,
238 DRM_FORMAT_ARGB1555,
239 DRM_FORMAT_XRGB1555,
240};
241
242static const u32 pl111_realview_pixel_formats[] = {
243 DRM_FORMAT_ABGR8888,
244 DRM_FORMAT_XBGR8888,
245 DRM_FORMAT_ARGB8888,
246 DRM_FORMAT_XRGB8888,
247 DRM_FORMAT_BGR565,
248 DRM_FORMAT_RGB565,
249 DRM_FORMAT_ABGR1555,
250 DRM_FORMAT_XBGR1555,
251 DRM_FORMAT_ARGB1555,
252 DRM_FORMAT_XRGB1555,
253 DRM_FORMAT_ABGR4444,
254 DRM_FORMAT_XBGR4444,
255 DRM_FORMAT_ARGB4444,
256 DRM_FORMAT_XRGB4444,
257};
258
259/*
260 * The Integrator variant is a PL110 with a bunch of broken, or not
261 * yet implemented features
262 */
263static const struct pl111_variant_data pl110_integrator = {
264 .name = "PL110 Integrator",
265 .is_pl110 = true,
266 .broken_clockdivider = true,
267 .broken_vblank = true,
268 .formats = pl110_integrator_pixel_formats,
269 .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
270 .fb_bpp = 16,
271};
272
273/*
274 * This is the in-between PL110 variant found in the ARM Versatile,
275 * supporting RGB565/BGR565
276 */
277static const struct pl111_variant_data pl110_versatile = {
278 .name = "PL110 Versatile",
279 .is_pl110 = true,
280 .external_bgr = true,
281 .formats = pl110_versatile_pixel_formats,
282 .nformats = ARRAY_SIZE(pl110_versatile_pixel_formats),
283 .fb_bpp = 16,
284};
285
286/*
287 * RealView PL111 variant, the only real difference from the vanilla
288 * PL111 is that we select 16bpp framebuffer by default to be able
289 * to get 1024x768 without saturating the memory bus.
290 */
291static const struct pl111_variant_data pl111_realview = {
292 .name = "PL111 RealView",
293 .formats = pl111_realview_pixel_formats,
294 .nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
295 .fb_bpp = 16,
296};
297
298/*
299 * Versatile Express PL111 variant, again we just push the maximum
300 * BPP to 16 to be able to get 1024x768 without saturating the memory
301 * bus. The clockdivider also seems broken on the Versatile Express.
302 */
303static const struct pl111_variant_data pl111_vexpress = {
304 .name = "PL111 Versatile Express",
305 .formats = pl111_realview_pixel_formats,
306 .nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
307 .fb_bpp = 16,
308 .broken_clockdivider = true,
309};
310
311int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
312{
313 const struct of_device_id *clcd_id;
314 enum versatile_clcd versatile_clcd_type;
315 struct device_node *np;
316 struct regmap *map;
317 int ret;
318
319 np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
320 &clcd_id);
321 if (!np) {
322 /* Non-ARM reference designs, just bail out */
323 return 0;
324 }
325 versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
326
327 /* Versatile Express special handling */
328 if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
329 struct platform_device *pdev;
330
331 /* Registers a driver for the muxfpga */
332 ret = vexpress_muxfpga_init();
333 if (ret) {
334 dev_err(dev, "unable to initialize muxfpga driver\n");
335 of_node_put(np);
336 return ret;
337 }
338
339 /* Call into deep Vexpress configuration API */
340 pdev = of_find_device_by_node(np);
341 if (!pdev) {
342 dev_err(dev, "can't find the sysreg device, deferring\n");
343 of_node_put(np);
344 return -EPROBE_DEFER;
345 }
346 map = dev_get_drvdata(&pdev->dev);
347 if (!map) {
348 dev_err(dev, "sysreg has not yet probed\n");
349 platform_device_put(pdev);
350 of_node_put(np);
351 return -EPROBE_DEFER;
352 }
353 } else {
354 map = syscon_node_to_regmap(np);
355 }
356 of_node_put(np);
357
358 if (IS_ERR(map)) {
359 dev_err(dev, "no Versatile syscon regmap\n");
360 return PTR_ERR(map);
361 }
362
363 switch (versatile_clcd_type) {
364 case INTEGRATOR_CLCD_CM:
365 versatile_syscon_map = map;
366 priv->variant = &pl110_integrator;
367 priv->variant_display_enable = pl111_integrator_enable;
368 dev_info(dev, "set up callbacks for Integrator PL110\n");
369 break;
370 case VERSATILE_CLCD:
371 versatile_syscon_map = map;
372 /* This can do RGB565 with external PLD */
373 priv->variant = &pl110_versatile;
374 priv->variant_display_enable = pl111_versatile_enable;
375 priv->variant_display_disable = pl111_versatile_disable;
376 /*
377 * The Versatile has a variant halfway between PL110
378 * and PL111 where these two registers have already been
379 * swapped.
380 */
381 priv->ienb = CLCD_PL111_IENB;
382 priv->ctrl = CLCD_PL111_CNTL;
383 dev_info(dev, "set up callbacks for Versatile PL110\n");
384 break;
385 case REALVIEW_CLCD_EB:
386 case REALVIEW_CLCD_PB1176:
387 case REALVIEW_CLCD_PB11MP:
388 case REALVIEW_CLCD_PBA8:
389 case REALVIEW_CLCD_PBX:
390 versatile_syscon_map = map;
391 priv->variant = &pl111_realview;
392 priv->variant_display_enable = pl111_realview_clcd_enable;
393 priv->variant_display_disable = pl111_realview_clcd_disable;
394 dev_info(dev, "set up callbacks for RealView PL111\n");
395 break;
396 case VEXPRESS_CLCD_V2M:
397 priv->variant = &pl111_vexpress;
398 dev_info(dev, "initializing Versatile Express PL111\n");
399 ret = pl111_vexpress_clcd_init(dev, priv, map);
400 if (ret)
401 return ret;
402 break;
403 default:
404 dev_info(dev, "unknown Versatile system controller\n");
405 break;
406 }
407
408 return 0;
409}
410EXPORT_SYMBOL_GPL(pl111_versatile_init);