1 // SPDX-License-Identifier: GPL-2.0-only
4 * Versatile family (ARM reference designs) handling for the PL11x.
5 * This is based on code and know-how in the previous frame buffer
6 * driver in drivers/video/fbdev/amba-clcd.c:
7 * Copyright (C) 2001 ARM Limited, by David A Rusling
8 * Updated to 2.5 by Deep Blue Solutions Ltd.
9 * Major contributions and discoveries by Russell King.
12 #include <linux/bitops.h>
13 #include <linux/device.h>
14 #include <linux/mfd/syscon.h>
15 #include <linux/module.h>
17 #include <linux/of_platform.h>
18 #include <linux/regmap.h>
19 #include <linux/vexpress.h>
21 #include "pl111_versatile.h"
22 #include "pl111_drm.h"
24 static struct regmap *versatile_syscon_map;
27 * We detect the different syscon types from the compatible strings.
41 static const struct of_device_id versatile_clcd_of_match[] = {
43 .compatible = "arm,core-module-integrator",
44 .data = (void *)INTEGRATOR_CLCD_CM,
47 .compatible = "arm,versatile-sysreg",
48 .data = (void *)VERSATILE_CLCD,
51 .compatible = "arm,realview-eb-syscon",
52 .data = (void *)REALVIEW_CLCD_EB,
55 .compatible = "arm,realview-pb1176-syscon",
56 .data = (void *)REALVIEW_CLCD_PB1176,
59 .compatible = "arm,realview-pb11mp-syscon",
60 .data = (void *)REALVIEW_CLCD_PB11MP,
63 .compatible = "arm,realview-pba8-syscon",
64 .data = (void *)REALVIEW_CLCD_PBA8,
67 .compatible = "arm,realview-pbx-syscon",
68 .data = (void *)REALVIEW_CLCD_PBX,
71 .compatible = "arm,vexpress-muxfpga",
72 .data = (void *)VEXPRESS_CLCD_V2M,
77 static const struct of_device_id impd1_clcd_of_match[] = {
79 .compatible = "arm,im-pd1-syscon",
80 .data = (void *)INTEGRATOR_IMPD1,
86 * Core module CLCD control on the Integrator/CP, bits
87 * 8 thru 19 of the CM_CONTROL register controls a bunch
90 #define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
91 #define INTEGRATOR_CLCD_LCDBIASEN BIT(8)
92 #define INTEGRATOR_CLCD_LCDBIASUP BIT(9)
93 #define INTEGRATOR_CLCD_LCDBIASDN BIT(10)
94 /* Bits 11,12,13 controls the LCD or VGA bridge type */
95 #define INTEGRATOR_CLCD_LCDMUX_LCD24 BIT(11)
96 #define INTEGRATOR_CLCD_LCDMUX_SHARP (BIT(11)|BIT(12))
97 #define INTEGRATOR_CLCD_LCDMUX_VGA555 BIT(13)
98 #define INTEGRATOR_CLCD_LCDMUX_VGA24 (BIT(11)|BIT(12)|BIT(13))
99 #define INTEGRATOR_CLCD_LCD0_EN BIT(14)
100 #define INTEGRATOR_CLCD_LCD1_EN BIT(15)
101 /* R/L flip on Sharp */
102 #define INTEGRATOR_CLCD_LCD_STATIC1 BIT(16)
103 /* U/D flip on Sharp */
104 #define INTEGRATOR_CLCD_LCD_STATIC2 BIT(17)
105 /* No connection on Sharp */
106 #define INTEGRATOR_CLCD_LCD_STATIC BIT(18)
107 /* 0 = 24bit VGA, 1 = 18bit VGA */
108 #define INTEGRATOR_CLCD_LCD_N24BITEN BIT(19)
110 #define INTEGRATOR_CLCD_MASK GENMASK(19, 8)
112 static void pl111_integrator_enable(struct drm_device *drm, u32 format)
116 dev_info(drm->dev, "enable Integrator CLCD connectors\n");
118 /* FIXME: really needed? */
119 val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
120 INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;
123 case DRM_FORMAT_XBGR8888:
124 case DRM_FORMAT_XRGB8888:
126 val |= INTEGRATOR_CLCD_LCDMUX_VGA24;
128 case DRM_FORMAT_XBGR1555:
129 case DRM_FORMAT_XRGB1555:
130 /* Pseudocolor, RGB555, BGR555 */
131 val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
134 dev_err(drm->dev, "unhandled format on Integrator 0x%08x\n",
139 regmap_update_bits(versatile_syscon_map,
140 INTEGRATOR_HDR_CTRL_OFFSET,
141 INTEGRATOR_CLCD_MASK,
145 #define IMPD1_CTRL_OFFSET 0x18
146 #define IMPD1_CTRL_DISP_LCD (0 << 0)
147 #define IMPD1_CTRL_DISP_VGA (1 << 0)
148 #define IMPD1_CTRL_DISP_LCD1 (2 << 0)
149 #define IMPD1_CTRL_DISP_ENABLE (1 << 2)
150 #define IMPD1_CTRL_DISP_MASK (7 << 0)
152 static void pl111_impd1_enable(struct drm_device *drm, u32 format)
156 dev_info(drm->dev, "enable IM-PD1 CLCD connectors\n");
157 val = IMPD1_CTRL_DISP_VGA | IMPD1_CTRL_DISP_ENABLE;
159 regmap_update_bits(versatile_syscon_map,
161 IMPD1_CTRL_DISP_MASK,
165 static void pl111_impd1_disable(struct drm_device *drm)
167 dev_info(drm->dev, "disable IM-PD1 CLCD connectors\n");
169 regmap_update_bits(versatile_syscon_map,
171 IMPD1_CTRL_DISP_MASK,
176 * This configuration register in the Versatile and RealView
177 * family is uniformly present but appears more and more
178 * unutilized starting with the RealView series.
180 #define SYS_CLCD 0x50
181 #define SYS_CLCD_MODE_MASK (BIT(0)|BIT(1))
182 #define SYS_CLCD_MODE_888 0
183 #define SYS_CLCD_MODE_5551 BIT(0)
184 #define SYS_CLCD_MODE_565_R_LSB BIT(1)
185 #define SYS_CLCD_MODE_565_B_LSB (BIT(0)|BIT(1))
186 #define SYS_CLCD_CONNECTOR_MASK (BIT(2)|BIT(3)|BIT(4)|BIT(5))
187 #define SYS_CLCD_NLCDIOON BIT(2)
188 #define SYS_CLCD_VDDPOSSWITCH BIT(3)
189 #define SYS_CLCD_PWR3V5SWITCH BIT(4)
190 #define SYS_CLCD_VDDNEGSWITCH BIT(5)
192 static void pl111_versatile_disable(struct drm_device *drm)
194 dev_info(drm->dev, "disable Versatile CLCD connectors\n");
195 regmap_update_bits(versatile_syscon_map,
197 SYS_CLCD_CONNECTOR_MASK,
201 static void pl111_versatile_enable(struct drm_device *drm, u32 format)
205 dev_info(drm->dev, "enable Versatile CLCD connectors\n");
208 case DRM_FORMAT_ABGR8888:
209 case DRM_FORMAT_XBGR8888:
210 case DRM_FORMAT_ARGB8888:
211 case DRM_FORMAT_XRGB8888:
212 val |= SYS_CLCD_MODE_888;
214 case DRM_FORMAT_BGR565:
215 val |= SYS_CLCD_MODE_565_R_LSB;
217 case DRM_FORMAT_RGB565:
218 val |= SYS_CLCD_MODE_565_B_LSB;
220 case DRM_FORMAT_ABGR1555:
221 case DRM_FORMAT_XBGR1555:
222 case DRM_FORMAT_ARGB1555:
223 case DRM_FORMAT_XRGB1555:
224 val |= SYS_CLCD_MODE_5551;
227 dev_err(drm->dev, "unhandled format on Versatile 0x%08x\n",
233 regmap_update_bits(versatile_syscon_map,
238 /* Then enable the display */
239 regmap_update_bits(versatile_syscon_map,
241 SYS_CLCD_CONNECTOR_MASK,
242 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
245 static void pl111_realview_clcd_disable(struct drm_device *drm)
247 dev_info(drm->dev, "disable RealView CLCD connectors\n");
248 regmap_update_bits(versatile_syscon_map,
250 SYS_CLCD_CONNECTOR_MASK,
254 static void pl111_realview_clcd_enable(struct drm_device *drm, u32 format)
256 dev_info(drm->dev, "enable RealView CLCD connectors\n");
257 regmap_update_bits(versatile_syscon_map,
259 SYS_CLCD_CONNECTOR_MASK,
260 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
263 /* PL110 pixel formats for Integrator, vanilla PL110 */
264 static const u32 pl110_integrator_pixel_formats[] = {
275 /* Extended PL110 pixel formats for Integrator and Versatile */
276 static const u32 pl110_versatile_pixel_formats[] = {
281 DRM_FORMAT_BGR565, /* Uses external PLD */
282 DRM_FORMAT_RGB565, /* Uses external PLD */
289 static const u32 pl111_realview_pixel_formats[] = {
307 * The Integrator variant is a PL110 with a bunch of broken, or not
308 * yet implemented features
310 static const struct pl111_variant_data pl110_integrator = {
311 .name = "PL110 Integrator",
313 .broken_clockdivider = true,
314 .broken_vblank = true,
315 .formats = pl110_integrator_pixel_formats,
316 .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
321 * The IM-PD1 variant is a PL110 with a bunch of broken, or not
322 * yet implemented features
324 static const struct pl111_variant_data pl110_impd1 = {
325 .name = "PL110 IM-PD1",
327 .broken_clockdivider = true,
328 .broken_vblank = true,
329 .formats = pl110_integrator_pixel_formats,
330 .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
335 * This is the in-between PL110 variant found in the ARM Versatile,
336 * supporting RGB565/BGR565
338 static const struct pl111_variant_data pl110_versatile = {
339 .name = "PL110 Versatile",
341 .external_bgr = true,
342 .formats = pl110_versatile_pixel_formats,
343 .nformats = ARRAY_SIZE(pl110_versatile_pixel_formats),
348 * RealView PL111 variant, the only real difference from the vanilla
349 * PL111 is that we select 16bpp framebuffer by default to be able
350 * to get 1024x768 without saturating the memory bus.
352 static const struct pl111_variant_data pl111_realview = {
353 .name = "PL111 RealView",
354 .formats = pl111_realview_pixel_formats,
355 .nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
360 * Versatile Express PL111 variant, again we just push the maximum
361 * BPP to 16 to be able to get 1024x768 without saturating the memory
362 * bus. The clockdivider also seems broken on the Versatile Express.
364 static const struct pl111_variant_data pl111_vexpress = {
365 .name = "PL111 Versatile Express",
366 .formats = pl111_realview_pixel_formats,
367 .nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
369 .broken_clockdivider = true,
372 #define VEXPRESS_FPGAMUX_MOTHERBOARD 0x00
373 #define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1 0x01
374 #define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2 0x02
376 static int pl111_vexpress_clcd_init(struct device *dev, struct device_node *np,
377 struct pl111_drm_dev_private *priv)
379 struct platform_device *pdev;
380 struct device_node *root;
381 struct device_node *child;
382 struct device_node *ct_clcd = NULL;
384 bool has_coretile_clcd = false;
385 bool has_coretile_hdlcd = false;
386 bool mux_motherboard = true;
390 if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG))
394 * Check if we have a CLCD or HDLCD on the core tile by checking if a
395 * CLCD or HDLCD is available in the root of the device tree.
397 root = of_find_node_by_path("/");
401 for_each_available_child_of_node(root, child) {
402 if (of_device_is_compatible(child, "arm,pl111")) {
403 has_coretile_clcd = true;
408 if (of_device_is_compatible(child, "arm,hdlcd")) {
409 has_coretile_hdlcd = true;
418 * If there is a coretile HDLCD and it has a driver,
419 * do not mux the CLCD on the motherboard to the DVI.
421 if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD))
422 mux_motherboard = false;
425 * On the Vexpress CA9 we let the CLCD on the coretile
426 * take precedence, so also in this case do not mux the
427 * motherboard to the DVI.
429 if (has_coretile_clcd)
430 mux_motherboard = false;
432 if (mux_motherboard) {
433 dev_info(dev, "DVI muxed to motherboard CLCD\n");
434 val = VEXPRESS_FPGAMUX_MOTHERBOARD;
435 } else if (ct_clcd == dev->of_node) {
437 "DVI muxed to daughterboard 1 (core tile) CLCD\n");
438 val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1;
440 dev_info(dev, "core tile graphics present\n");
441 dev_info(dev, "this device will be deactivated\n");
445 /* Call into deep Vexpress configuration API */
446 pdev = of_find_device_by_node(np);
448 dev_err(dev, "can't find the sysreg device, deferring\n");
449 return -EPROBE_DEFER;
452 map = devm_regmap_init_vexpress_config(&pdev->dev);
454 platform_device_put(pdev);
458 ret = regmap_write(map, 0, val);
459 platform_device_put(pdev);
461 dev_err(dev, "error setting DVI muxmode\n");
465 priv->variant = &pl111_vexpress;
466 dev_info(dev, "initializing Versatile Express PL111\n");
471 int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
473 const struct of_device_id *clcd_id;
474 enum versatile_clcd versatile_clcd_type;
475 struct device_node *np;
478 np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
481 /* Non-ARM reference designs, just bail out */
485 versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
487 /* Versatile Express special handling */
488 if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
489 int ret = pl111_vexpress_clcd_init(dev, np, priv);
492 dev_err(dev, "Versatile Express init failed - %d", ret);
497 * On the Integrator, check if we should use the IM-PD1 instead,
498 * if we find it, it will take precedence. This is on the Integrator/AP
499 * which only has this option for PL110 graphics.
501 if (versatile_clcd_type == INTEGRATOR_CLCD_CM) {
502 np = of_find_matching_node_and_match(NULL, impd1_clcd_of_match,
505 versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
508 map = syscon_node_to_regmap(np);
511 dev_err(dev, "no Versatile syscon regmap\n");
515 switch (versatile_clcd_type) {
516 case INTEGRATOR_CLCD_CM:
517 versatile_syscon_map = map;
518 priv->variant = &pl110_integrator;
519 priv->variant_display_enable = pl111_integrator_enable;
520 dev_info(dev, "set up callbacks for Integrator PL110\n");
522 case INTEGRATOR_IMPD1:
523 versatile_syscon_map = map;
524 priv->variant = &pl110_impd1;
525 priv->variant_display_enable = pl111_impd1_enable;
526 priv->variant_display_disable = pl111_impd1_disable;
527 dev_info(dev, "set up callbacks for IM-PD1 PL110\n");
530 versatile_syscon_map = map;
531 /* This can do RGB565 with external PLD */
532 priv->variant = &pl110_versatile;
533 priv->variant_display_enable = pl111_versatile_enable;
534 priv->variant_display_disable = pl111_versatile_disable;
536 * The Versatile has a variant halfway between PL110
537 * and PL111 where these two registers have already been
540 priv->ienb = CLCD_PL111_IENB;
541 priv->ctrl = CLCD_PL111_CNTL;
542 dev_info(dev, "set up callbacks for Versatile PL110\n");
544 case REALVIEW_CLCD_EB:
545 case REALVIEW_CLCD_PB1176:
546 case REALVIEW_CLCD_PB11MP:
547 case REALVIEW_CLCD_PBA8:
548 case REALVIEW_CLCD_PBX:
549 versatile_syscon_map = map;
550 priv->variant = &pl111_realview;
551 priv->variant_display_enable = pl111_realview_clcd_enable;
552 priv->variant_display_disable = pl111_realview_clcd_disable;
553 dev_info(dev, "set up callbacks for RealView PL111\n");
556 dev_info(dev, "unknown Versatile system controller\n");
562 EXPORT_SYMBOL_GPL(pl111_versatile_init);