drivers/gpu/drm/pl111/pl111_versatile.c

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