drivers/gpu/drm/sun4i/sun4i_backend.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <maxime.ripard@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  */
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_fb_cma_helper.h>
  18 #include <drm/drm_gem_cma_helper.h>
  19 #include <drm/drm_plane_helper.h>
  20
  21 #include <linux/component.h>
  22 #include <linux/reset.h>
  23
  24 #include "sun4i_backend.h"
  25 #include "sun4i_drv.h"
  26
  27 static u32 sunxi_rgb2yuv_coef[12] = {
  28         0x00000107, 0x00000204, 0x00000064, 0x00000108,
  29         0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808,
  30         0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
  31 };
  32
  33 void sun4i_backend_apply_color_correction(struct sun4i_backend *backend)
  34 {
  35         int i;
  36
  37         DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
  38
  39         /* Set color correction */
  40         regmap_write(backend->regs, SUN4I_BACKEND_OCCTL_REG,
  41                      SUN4I_BACKEND_OCCTL_ENABLE);
  42
  43         for (i = 0; i < 12; i++)
  44                 regmap_write(backend->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
  45                              sunxi_rgb2yuv_coef[i]);
  46 }
  47 EXPORT_SYMBOL(sun4i_backend_apply_color_correction);
  48
  49 void sun4i_backend_disable_color_correction(struct sun4i_backend *backend)
  50 {
  51         DRM_DEBUG_DRIVER("Disabling color correction\n");
  52
  53         /* Disable color correction */
  54         regmap_update_bits(backend->regs, SUN4I_BACKEND_OCCTL_REG,
  55                            SUN4I_BACKEND_OCCTL_ENABLE, 0);
  56 }
  57 EXPORT_SYMBOL(sun4i_backend_disable_color_correction);
  58
  59 void sun4i_backend_commit(struct sun4i_backend *backend)
  60 {
  61         DRM_DEBUG_DRIVER("Committing changes\n");
  62
  63         regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
  64                      SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
  65                      SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
  66 }
  67 EXPORT_SYMBOL(sun4i_backend_commit);
  68
  69 void sun4i_backend_layer_enable(struct sun4i_backend *backend,
  70                                 int layer, bool enable)
  71 {
  72         u32 val;
  73
  74         DRM_DEBUG_DRIVER("Enabling layer %d\n", layer);
  75
  76         if (enable)
  77                 val = SUN4I_BACKEND_MODCTL_LAY_EN(layer);
  78         else
  79                 val = 0;
  80
  81         regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
  82                            SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
  83 }
  84 EXPORT_SYMBOL(sun4i_backend_layer_enable);
  85
  86 static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane,
  87                                              u32 format, u32 *mode)
  88 {
  89         if ((plane->type == DRM_PLANE_TYPE_PRIMARY) &&
  90             (format == DRM_FORMAT_ARGB8888))
  91                 format = DRM_FORMAT_XRGB8888;
  92
  93         switch (format) {
  94         case DRM_FORMAT_ARGB8888:
  95                 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888;
  96                 break;
  97
  98         case DRM_FORMAT_ARGB4444:
  99                 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444;
 100                 break;
 101
 102         case DRM_FORMAT_ARGB1555:
 103                 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555;
 104                 break;
 105
 106         case DRM_FORMAT_RGBA5551:
 107                 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551;
 108                 break;
 109
 110         case DRM_FORMAT_RGBA4444:
 111                 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444;
 112                 break;
 113
 114         case DRM_FORMAT_XRGB8888:
 115                 *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888;
 116                 break;
 117
 118         case DRM_FORMAT_RGB888:
 119                 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888;
 120                 break;
 121
 122         case DRM_FORMAT_RGB565:
 123                 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565;
 124                 break;
 125
 126         default:
 127                 return -EINVAL;
 128         }
 129
 130         return 0;
 131 }
 132
 133 int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
 134                                      int layer, struct drm_plane *plane)
 135 {
 136         struct drm_plane_state *state = plane->state;
 137         struct drm_framebuffer *fb = state->fb;
 138
 139         DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
 140
 141         if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
 142                 DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
 143                                  state->crtc_w, state->crtc_h);
 144                 regmap_write(backend->regs, SUN4I_BACKEND_DISSIZE_REG,
 145                              SUN4I_BACKEND_DISSIZE(state->crtc_w,
 146                                                    state->crtc_h));
 147         }
 148
 149         /* Set the line width */
 150         DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
 151         regmap_write(backend->regs, SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
 152                      fb->pitches[0] * 8);
 153
 154         /* Set height and width */
 155         DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
 156                          state->crtc_w, state->crtc_h);
 157         regmap_write(backend->regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
 158                      SUN4I_BACKEND_LAYSIZE(state->crtc_w,
 159                                            state->crtc_h));
 160
 161         /* Set base coordinates */
 162         DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
 163                          state->crtc_x, state->crtc_y);
 164         regmap_write(backend->regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
 165                      SUN4I_BACKEND_LAYCOOR(state->crtc_x,
 166                                            state->crtc_y));
 167
 168         return 0;
 169 }
 170 EXPORT_SYMBOL(sun4i_backend_update_layer_coord);
 171
 172 int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
 173                                        int layer, struct drm_plane *plane)
 174 {
 175         struct drm_plane_state *state = plane->state;
 176         struct drm_framebuffer *fb = state->fb;
 177         bool interlaced = false;
 178         u32 val;
 179         int ret;
 180
 181         if (plane->state->crtc)
 182                 interlaced = plane->state->crtc->state->adjusted_mode.flags
 183                         & DRM_MODE_FLAG_INTERLACE;
 184
 185         regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
 186                            SUN4I_BACKEND_MODCTL_ITLMOD_EN,
 187                            interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);
 188
 189         DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n",
 190                          interlaced ? "on" : "off");
 191
 192         ret = sun4i_backend_drm_format_to_layer(plane, fb->format->format,
 193                                                 &val);
 194         if (ret) {
 195                 DRM_DEBUG_DRIVER("Invalid format\n");
 196                 return val;
 197         }
 198
 199         regmap_update_bits(backend->regs, SUN4I_BACKEND_ATTCTL_REG1(layer),
 200                            SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL(sun4i_backend_update_layer_formats);
 205
 206 int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
 207                                       int layer, struct drm_plane *plane)
 208 {
 209         struct drm_plane_state *state = plane->state;
 210         struct drm_framebuffer *fb = state->fb;
 211         struct drm_gem_cma_object *gem;
 212         u32 lo_paddr, hi_paddr;
 213         dma_addr_t paddr;
 214         int bpp;
 215
 216         /* Get the physical address of the buffer in memory */
 217         gem = drm_fb_cma_get_gem_obj(fb, 0);
 218
 219         DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
 220
 221         /* Compute the start of the displayed memory */
 222         bpp = fb->format->cpp[0];
 223         paddr = gem->paddr + fb->offsets[0];
 224         paddr += (state->src_x >> 16) * bpp;
 225         paddr += (state->src_y >> 16) * fb->pitches[0];
 226
 227         DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
 228
 229         /* Write the 32 lower bits of the address (in bits) */
 230         lo_paddr = paddr << 3;
 231         DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr);
 232         regmap_write(backend->regs, SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
 233                      lo_paddr);
 234
 235         /* And the upper bits */
 236         hi_paddr = paddr >> 29;
 237         DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr);
 238         regmap_update_bits(backend->regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
 239                            SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
 240                            SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));
 241
 242         return 0;
 243 }
 244 EXPORT_SYMBOL(sun4i_backend_update_layer_buffer);
 245
 246 static int sun4i_backend_init_sat(struct device *dev) {
 247         struct sun4i_backend *backend = dev_get_drvdata(dev);
 248         int ret;
 249
 250         backend->sat_reset = devm_reset_control_get(dev, "sat");
 251         if (IS_ERR(backend->sat_reset)) {
 252                 dev_err(dev, "Couldn't get the SAT reset line\n");
 253                 return PTR_ERR(backend->sat_reset);
 254         }
 255
 256         ret = reset_control_deassert(backend->sat_reset);
 257         if (ret) {
 258                 dev_err(dev, "Couldn't deassert the SAT reset line\n");
 259                 return ret;
 260         }
 261
 262         backend->sat_clk = devm_clk_get(dev, "sat");
 263         if (IS_ERR(backend->sat_clk)) {
 264                 dev_err(dev, "Couldn't get our SAT clock\n");
 265                 ret = PTR_ERR(backend->sat_clk);
 266                 goto err_assert_reset;
 267         }
 268
 269         ret = clk_prepare_enable(backend->sat_clk);
 270         if (ret) {
 271                 dev_err(dev, "Couldn't enable the SAT clock\n");
 272                 return ret;
 273         }
 274
 275         return 0;
 276
 277 err_assert_reset:
 278         reset_control_assert(backend->sat_reset);
 279         return ret;
 280 }
 281
 282 static int sun4i_backend_free_sat(struct device *dev) {
 283         struct sun4i_backend *backend = dev_get_drvdata(dev);
 284
 285         clk_disable_unprepare(backend->sat_clk);
 286         reset_control_assert(backend->sat_reset);
 287
 288         return 0;
 289 }
 290
 291 static struct regmap_config sun4i_backend_regmap_config = {
 292         .reg_bits       = 32,
 293         .val_bits       = 32,
 294         .reg_stride     = 4,
 295         .max_register   = 0x5800,
 296 };
 297
 298 static int sun4i_backend_bind(struct device *dev, struct device *master,
 299                               void *data)
 300 {
 301         struct platform_device *pdev = to_platform_device(dev);
 302         struct drm_device *drm = data;
 303         struct sun4i_drv *drv = drm->dev_private;
 304         struct sun4i_backend *backend;
 305         struct resource *res;
 306         void __iomem *regs;
 307         int i, ret;
 308
 309         backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL);
 310         if (!backend)
 311                 return -ENOMEM;
 312         dev_set_drvdata(dev, backend);
 313         drv->backend = backend;
 314
 315         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 316         regs = devm_ioremap_resource(dev, res);
 317         if (IS_ERR(regs))
 318                 return PTR_ERR(regs);
 319
 320         backend->regs = devm_regmap_init_mmio(dev, regs,
 321                                               &sun4i_backend_regmap_config);
 322         if (IS_ERR(backend->regs)) {
 323                 dev_err(dev, "Couldn't create the backend0 regmap\n");
 324                 return PTR_ERR(backend->regs);
 325         }
 326
 327         backend->reset = devm_reset_control_get(dev, NULL);
 328         if (IS_ERR(backend->reset)) {
 329                 dev_err(dev, "Couldn't get our reset line\n");
 330                 return PTR_ERR(backend->reset);
 331         }
 332
 333         ret = reset_control_deassert(backend->reset);
 334         if (ret) {
 335                 dev_err(dev, "Couldn't deassert our reset line\n");
 336                 return ret;
 337         }
 338
 339         backend->bus_clk = devm_clk_get(dev, "ahb");
 340         if (IS_ERR(backend->bus_clk)) {
 341                 dev_err(dev, "Couldn't get the backend bus clock\n");
 342                 ret = PTR_ERR(backend->bus_clk);
 343                 goto err_assert_reset;
 344         }
 345         clk_prepare_enable(backend->bus_clk);
 346
 347         backend->mod_clk = devm_clk_get(dev, "mod");
 348         if (IS_ERR(backend->mod_clk)) {
 349                 dev_err(dev, "Couldn't get the backend module clock\n");
 350                 ret = PTR_ERR(backend->mod_clk);
 351                 goto err_disable_bus_clk;
 352         }
 353         clk_prepare_enable(backend->mod_clk);
 354
 355         backend->ram_clk = devm_clk_get(dev, "ram");
 356         if (IS_ERR(backend->ram_clk)) {
 357                 dev_err(dev, "Couldn't get the backend RAM clock\n");
 358                 ret = PTR_ERR(backend->ram_clk);
 359                 goto err_disable_mod_clk;
 360         }
 361         clk_prepare_enable(backend->ram_clk);
 362
 363         if (of_device_is_compatible(dev->of_node,
 364                                     "allwinner,sun8i-a33-display-backend")) {
 365                 ret = sun4i_backend_init_sat(dev);
 366                 if (ret) {
 367                         dev_err(dev, "Couldn't init SAT resources\n");
 368                         goto err_disable_ram_clk;
 369                 }
 370         }
 371
 372         /* Reset the registers */
 373         for (i = 0x800; i < 0x1000; i += 4)
 374                 regmap_write(backend->regs, i, 0);
 375
 376         /* Disable registers autoloading */
 377         regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
 378                      SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);
 379
 380         /* Enable the backend */
 381         regmap_write(backend->regs, SUN4I_BACKEND_MODCTL_REG,
 382                      SUN4I_BACKEND_MODCTL_DEBE_EN |
 383                      SUN4I_BACKEND_MODCTL_START_CTL);
 384
 385         return 0;
 386
 387 err_disable_ram_clk:
 388         clk_disable_unprepare(backend->ram_clk);
 389 err_disable_mod_clk:
 390         clk_disable_unprepare(backend->mod_clk);
 391 err_disable_bus_clk:
 392         clk_disable_unprepare(backend->bus_clk);
 393 err_assert_reset:
 394         reset_control_assert(backend->reset);
 395         return ret;
 396 }
 397
 398 static void sun4i_backend_unbind(struct device *dev, struct device *master,
 399                                  void *data)
 400 {
 401         struct sun4i_backend *backend = dev_get_drvdata(dev);
 402
 403         if (of_device_is_compatible(dev->of_node,
 404                                     "allwinner,sun8i-a33-display-backend"))
 405                 sun4i_backend_free_sat(dev);
 406
 407         clk_disable_unprepare(backend->ram_clk);
 408         clk_disable_unprepare(backend->mod_clk);
 409         clk_disable_unprepare(backend->bus_clk);
 410         reset_control_assert(backend->reset);
 411 }
 412
 413 static const struct component_ops sun4i_backend_ops = {
 414         .bind   = sun4i_backend_bind,
 415         .unbind = sun4i_backend_unbind,
 416 };
 417
 418 static int sun4i_backend_probe(struct platform_device *pdev)
 419 {
 420         return component_add(&pdev->dev, &sun4i_backend_ops);
 421 }
 422
 423 static int sun4i_backend_remove(struct platform_device *pdev)
 424 {
 425         component_del(&pdev->dev, &sun4i_backend_ops);
 426
 427         return 0;
 428 }
 429
 430 static const struct of_device_id sun4i_backend_of_table[] = {
 431         { .compatible = "allwinner,sun5i-a13-display-backend" },
 432         { .compatible = "allwinner,sun6i-a31-display-backend" },
 433         { .compatible = "allwinner,sun8i-a33-display-backend" },
 434         { }
 435 };
 436 MODULE_DEVICE_TABLE(of, sun4i_backend_of_table);
 437
 438 static struct platform_driver sun4i_backend_platform_driver = {
 439         .probe          = sun4i_backend_probe,
 440         .remove         = sun4i_backend_remove,
 441         .driver         = {
 442                 .name           = "sun4i-backend",
 443                 .of_match_table = sun4i_backend_of_table,
 444         },
 445 };
 446 module_platform_driver(sun4i_backend_platform_driver);
 447
 448 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 449 MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver");
 450 MODULE_LICENSE("GPL");