1 // SPDX-License-Identifier: GPL-2.0-only
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>
9 #include <linux/of_platform.h>
10 #include <linux/regmap.h>
12 #include "pl111_versatile.h"
13 #include "pl111_vexpress.h"
14 #include "pl111_drm.h"
16 static struct regmap *versatile_syscon_map;
19 * We detect the different syscon types from the compatible strings.
32 static const struct of_device_id versatile_clcd_of_match[] = {
34 .compatible = "arm,core-module-integrator",
35 .data = (void *)INTEGRATOR_CLCD_CM,
38 .compatible = "arm,versatile-sysreg",
39 .data = (void *)VERSATILE_CLCD,
42 .compatible = "arm,realview-eb-syscon",
43 .data = (void *)REALVIEW_CLCD_EB,
46 .compatible = "arm,realview-pb1176-syscon",
47 .data = (void *)REALVIEW_CLCD_PB1176,
50 .compatible = "arm,realview-pb11mp-syscon",
51 .data = (void *)REALVIEW_CLCD_PB11MP,
54 .compatible = "arm,realview-pba8-syscon",
55 .data = (void *)REALVIEW_CLCD_PBA8,
58 .compatible = "arm,realview-pbx-syscon",
59 .data = (void *)REALVIEW_CLCD_PBX,
62 .compatible = "arm,vexpress-muxfpga",
63 .data = (void *)VEXPRESS_CLCD_V2M,
69 * Core module CLCD control on the Integrator/CP, bits
70 * 8 thru 19 of the CM_CONTROL register controls a bunch
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)
93 #define INTEGRATOR_CLCD_MASK GENMASK(19, 8)
95 static void pl111_integrator_enable(struct drm_device *drm, u32 format)
99 dev_info(drm->dev, "enable Integrator CLCD connectors\n");
101 /* FIXME: really needed? */
102 val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
103 INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;
106 case DRM_FORMAT_XBGR8888:
107 case DRM_FORMAT_XRGB8888:
109 val |= INTEGRATOR_CLCD_LCDMUX_VGA24;
111 case DRM_FORMAT_XBGR1555:
112 case DRM_FORMAT_XRGB1555:
113 /* Pseudocolor, RGB555, BGR555 */
114 val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
117 dev_err(drm->dev, "unhandled format on Integrator 0x%08x\n",
122 regmap_update_bits(versatile_syscon_map,
123 INTEGRATOR_HDR_CTRL_OFFSET,
124 INTEGRATOR_CLCD_MASK,
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.
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)
145 static void pl111_versatile_disable(struct drm_device *drm)
147 dev_info(drm->dev, "disable Versatile CLCD connectors\n");
148 regmap_update_bits(versatile_syscon_map,
150 SYS_CLCD_CONNECTOR_MASK,
154 static void pl111_versatile_enable(struct drm_device *drm, u32 format)
158 dev_info(drm->dev, "enable Versatile CLCD connectors\n");
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;
167 case DRM_FORMAT_BGR565:
168 val |= SYS_CLCD_MODE_565_R_LSB;
170 case DRM_FORMAT_RGB565:
171 val |= SYS_CLCD_MODE_565_B_LSB;
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;
180 dev_err(drm->dev, "unhandled format on Versatile 0x%08x\n",
186 regmap_update_bits(versatile_syscon_map,
191 /* Then enable the display */
192 regmap_update_bits(versatile_syscon_map,
194 SYS_CLCD_CONNECTOR_MASK,
195 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
198 static void pl111_realview_clcd_disable(struct drm_device *drm)
200 dev_info(drm->dev, "disable RealView CLCD connectors\n");
201 regmap_update_bits(versatile_syscon_map,
203 SYS_CLCD_CONNECTOR_MASK,
207 static void pl111_realview_clcd_enable(struct drm_device *drm, u32 format)
209 dev_info(drm->dev, "enable RealView CLCD connectors\n");
210 regmap_update_bits(versatile_syscon_map,
212 SYS_CLCD_CONNECTOR_MASK,
213 SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
216 /* PL110 pixel formats for Integrator, vanilla PL110 */
217 static const u32 pl110_integrator_pixel_formats[] = {
228 /* Extended PL110 pixel formats for Integrator and Versatile */
229 static const u32 pl110_versatile_pixel_formats[] = {
234 DRM_FORMAT_BGR565, /* Uses external PLD */
235 DRM_FORMAT_RGB565, /* Uses external PLD */
242 static const u32 pl111_realview_pixel_formats[] = {
260 * The Integrator variant is a PL110 with a bunch of broken, or not
261 * yet implemented features
263 static const struct pl111_variant_data pl110_integrator = {
264 .name = "PL110 Integrator",
266 .broken_clockdivider = true,
267 .broken_vblank = true,
268 .formats = pl110_integrator_pixel_formats,
269 .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
274 * This is the in-between PL110 variant found in the ARM Versatile,
275 * supporting RGB565/BGR565
277 static const struct pl111_variant_data pl110_versatile = {
278 .name = "PL110 Versatile",
280 .external_bgr = true,
281 .formats = pl110_versatile_pixel_formats,
282 .nformats = ARRAY_SIZE(pl110_versatile_pixel_formats),
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.
291 static 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),
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.
303 static 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),
308 .broken_clockdivider = true,
311 int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
313 const struct of_device_id *clcd_id;
314 enum versatile_clcd versatile_clcd_type;
315 struct device_node *np;
319 np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
322 /* Non-ARM reference designs, just bail out */
325 versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
327 /* Versatile Express special handling */
328 if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
329 struct platform_device *pdev;
331 /* Registers a driver for the muxfpga */
332 ret = vexpress_muxfpga_init();
334 dev_err(dev, "unable to initialize muxfpga driver\n");
339 /* Call into deep Vexpress configuration API */
340 pdev = of_find_device_by_node(np);
342 dev_err(dev, "can't find the sysreg device, deferring\n");
344 return -EPROBE_DEFER;
346 map = dev_get_drvdata(&pdev->dev);
348 dev_err(dev, "sysreg has not yet probed\n");
349 platform_device_put(pdev);
351 return -EPROBE_DEFER;
354 map = syscon_node_to_regmap(np);
359 dev_err(dev, "no Versatile syscon regmap\n");
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");
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;
377 * The Versatile has a variant halfway between PL110
378 * and PL111 where these two registers have already been
381 priv->ienb = CLCD_PL111_IENB;
382 priv->ctrl = CLCD_PL111_CNTL;
383 dev_info(dev, "set up callbacks for Versatile PL110\n");
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");
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);
404 dev_info(dev, "unknown Versatile system controller\n");
410 EXPORT_SYMBOL_GPL(pl111_versatile_init);