drivers/gpu/drm/sti/sti_cursor.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics SA 2014
   4  * Authors: Vincent Abriou <vincent.abriou@st.com>
   5  *          Fabien Dessenne <fabien.dessenne@st.com>
   6  *          for STMicroelectronics.
   7  */
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/seq_file.h>
  11
  12 #include <drm/drm_atomic.h>
  13 #include <drm/drm_device.h>
  14 #include <drm/drm_fb_cma_helper.h>
  15 #include <drm/drm_gem_cma_helper.h>
  16
  17 #include "sti_compositor.h"
  18 #include "sti_cursor.h"
  19 #include "sti_plane.h"
  20 #include "sti_vtg.h"
  21
  22 /* Registers */
  23 #define CUR_CTL             0x00
  24 #define CUR_VPO             0x0C
  25 #define CUR_PML             0x14
  26 #define CUR_PMP             0x18
  27 #define CUR_SIZE            0x1C
  28 #define CUR_CML             0x20
  29 #define CUR_AWS             0x28
  30 #define CUR_AWE             0x2C
  31
  32 #define CUR_CTL_CLUT_UPDATE BIT(1)
  33
  34 #define STI_CURS_MIN_SIZE   1
  35 #define STI_CURS_MAX_SIZE   128
  36
  37 /*
  38  * pixmap dma buffer structure
  39  *
  40  * @paddr:  physical address
  41  * @size:   buffer size
  42  * @base:   virtual address
  43  */
  44 struct dma_pixmap {
  45         dma_addr_t paddr;
  46         size_t size;
  47         void *base;
  48 };
  49
  50 /*
  51  * STI Cursor structure
  52  *
  53  * @sti_plane:    sti_plane structure
  54  * @dev:          driver device
  55  * @regs:         cursor registers
  56  * @width:        cursor width
  57  * @height:       cursor height
  58  * @clut:         color look up table
  59  * @clut_paddr:   color look up table physical address
  60  * @pixmap:       pixmap dma buffer (clut8-format cursor)
  61  */
  62 struct sti_cursor {
  63         struct sti_plane plane;
  64         struct device *dev;
  65         void __iomem *regs;
  66         unsigned int width;
  67         unsigned int height;
  68         unsigned short *clut;
  69         dma_addr_t clut_paddr;
  70         struct dma_pixmap pixmap;
  71 };
  72
  73 static const uint32_t cursor_supported_formats[] = {
  74         DRM_FORMAT_ARGB8888,
  75 };
  76
  77 #define to_sti_cursor(x) container_of(x, struct sti_cursor, plane)
  78
  79 #define DBGFS_DUMP(reg) seq_printf(s, "\n  %-25s 0x%08X", #reg, \
  80                                    readl(cursor->regs + reg))
  81
  82 static void cursor_dbg_vpo(struct seq_file *s, u32 val)
  83 {
  84         seq_printf(s, "\txdo:%4d\tydo:%4d", val & 0x0FFF, (val >> 16) & 0x0FFF);
  85 }
  86
  87 static void cursor_dbg_size(struct seq_file *s, u32 val)
  88 {
  89         seq_printf(s, "\t%d x %d", val & 0x07FF, (val >> 16) & 0x07FF);
  90 }
  91
  92 static void cursor_dbg_pml(struct seq_file *s,
  93                            struct sti_cursor *cursor, u32 val)
  94 {
  95         if (cursor->pixmap.paddr == val)
  96                 seq_printf(s, "\tVirt @: %p", cursor->pixmap.base);
  97 }
  98
  99 static void cursor_dbg_cml(struct seq_file *s,
 100                            struct sti_cursor *cursor, u32 val)
 101 {
 102         if (cursor->clut_paddr == val)
 103                 seq_printf(s, "\tVirt @: %p", cursor->clut);
 104 }
 105
 106 static int cursor_dbg_show(struct seq_file *s, void *data)
 107 {
 108         struct drm_info_node *node = s->private;
 109         struct sti_cursor *cursor = (struct sti_cursor *)node->info_ent->data;
 110
 111         seq_printf(s, "%s: (vaddr = 0x%p)",
 112                    sti_plane_to_str(&cursor->plane), cursor->regs);
 113
 114         DBGFS_DUMP(CUR_CTL);
 115         DBGFS_DUMP(CUR_VPO);
 116         cursor_dbg_vpo(s, readl(cursor->regs + CUR_VPO));
 117         DBGFS_DUMP(CUR_PML);
 118         cursor_dbg_pml(s, cursor, readl(cursor->regs + CUR_PML));
 119         DBGFS_DUMP(CUR_PMP);
 120         DBGFS_DUMP(CUR_SIZE);
 121         cursor_dbg_size(s, readl(cursor->regs + CUR_SIZE));
 122         DBGFS_DUMP(CUR_CML);
 123         cursor_dbg_cml(s, cursor, readl(cursor->regs + CUR_CML));
 124         DBGFS_DUMP(CUR_AWS);
 125         DBGFS_DUMP(CUR_AWE);
 126         seq_putc(s, '\n');
 127         return 0;
 128 }
 129
 130 static struct drm_info_list cursor_debugfs_files[] = {
 131         { "cursor", cursor_dbg_show, 0, NULL },
 132 };
 133
 134 static int cursor_debugfs_init(struct sti_cursor *cursor,
 135                                struct drm_minor *minor)
 136 {
 137         unsigned int i;
 138
 139         for (i = 0; i < ARRAY_SIZE(cursor_debugfs_files); i++)
 140                 cursor_debugfs_files[i].data = cursor;
 141
 142         return drm_debugfs_create_files(cursor_debugfs_files,
 143                                         ARRAY_SIZE(cursor_debugfs_files),
 144                                         minor->debugfs_root, minor);
 145 }
 146
 147 static void sti_cursor_argb8888_to_clut8(struct sti_cursor *cursor, u32 *src)
 148 {
 149         u8  *dst = cursor->pixmap.base;
 150         unsigned int i, j;
 151         u32 a, r, g, b;
 152
 153         for (i = 0; i < cursor->height; i++) {
 154                 for (j = 0; j < cursor->width; j++) {
 155                         /* Pick the 2 higher bits of each component */
 156                         a = (*src >> 30) & 3;
 157                         r = (*src >> 22) & 3;
 158                         g = (*src >> 14) & 3;
 159                         b = (*src >> 6) & 3;
 160                         *dst = a << 6 | r << 4 | g << 2 | b;
 161                         src++;
 162                         dst++;
 163                 }
 164         }
 165 }
 166
 167 static void sti_cursor_init(struct sti_cursor *cursor)
 168 {
 169         unsigned short *base = cursor->clut;
 170         unsigned int a, r, g, b;
 171
 172         /* Assign CLUT values, ARGB444 format */
 173         for (a = 0; a < 4; a++)
 174                 for (r = 0; r < 4; r++)
 175                         for (g = 0; g < 4; g++)
 176                                 for (b = 0; b < 4; b++)
 177                                         *base++ = (a * 5) << 12 |
 178                                                   (r * 5) << 8 |
 179                                                   (g * 5) << 4 |
 180                                                   (b * 5);
 181 }
 182
 183 static int sti_cursor_atomic_check(struct drm_plane *drm_plane,
 184                                    struct drm_plane_state *state)
 185 {
 186         struct sti_plane *plane = to_sti_plane(drm_plane);
 187         struct sti_cursor *cursor = to_sti_cursor(plane);
 188         struct drm_crtc *crtc = state->crtc;
 189         struct drm_framebuffer *fb = state->fb;
 190         struct drm_crtc_state *crtc_state;
 191         struct drm_display_mode *mode;
 192         int dst_x, dst_y, dst_w, dst_h;
 193         int src_w, src_h;
 194
 195         /* no need for further checks if the plane is being disabled */
 196         if (!crtc || !fb)
 197                 return 0;
 198
 199         crtc_state = drm_atomic_get_crtc_state(state->state, crtc);
 200         mode = &crtc_state->mode;
 201         dst_x = state->crtc_x;
 202         dst_y = state->crtc_y;
 203         dst_w = clamp_val(state->crtc_w, 0, mode->crtc_hdisplay - dst_x);
 204         dst_h = clamp_val(state->crtc_h, 0, mode->crtc_vdisplay - dst_y);
 205         /* src_x are in 16.16 format */
 206         src_w = state->src_w >> 16;
 207         src_h = state->src_h >> 16;
 208
 209         if (src_w < STI_CURS_MIN_SIZE ||
 210             src_h < STI_CURS_MIN_SIZE ||
 211             src_w > STI_CURS_MAX_SIZE ||
 212             src_h > STI_CURS_MAX_SIZE) {
 213                 DRM_ERROR("Invalid cursor size (%dx%d)\n",
 214                                 src_w, src_h);
 215                 return -EINVAL;
 216         }
 217
 218         /* If the cursor size has changed, re-allocated the pixmap */
 219         if (!cursor->pixmap.base ||
 220             (cursor->width != src_w) ||
 221             (cursor->height != src_h)) {
 222                 cursor->width = src_w;
 223                 cursor->height = src_h;
 224
 225                 if (cursor->pixmap.base)
 226                         dma_free_wc(cursor->dev, cursor->pixmap.size,
 227                                     cursor->pixmap.base, cursor->pixmap.paddr);
 228
 229                 cursor->pixmap.size = cursor->width * cursor->height;
 230
 231                 cursor->pixmap.base = dma_alloc_wc(cursor->dev,
 232                                                    cursor->pixmap.size,
 233                                                    &cursor->pixmap.paddr,
 234                                                    GFP_KERNEL | GFP_DMA);
 235                 if (!cursor->pixmap.base) {
 236                         DRM_ERROR("Failed to allocate memory for pixmap\n");
 237                         return -EINVAL;
 238                 }
 239         }
 240
 241         if (!drm_fb_cma_get_gem_obj(fb, 0)) {
 242                 DRM_ERROR("Can't get CMA GEM object for fb\n");
 243                 return -EINVAL;
 244         }
 245
 246         DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
 247                       crtc->base.id, sti_mixer_to_str(to_sti_mixer(crtc)),
 248                       drm_plane->base.id, sti_plane_to_str(plane));
 249         DRM_DEBUG_KMS("(%dx%d)@(%d,%d)\n", dst_w, dst_h, dst_x, dst_y);
 250
 251         return 0;
 252 }
 253
 254 static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 255                                      struct drm_plane_state *oldstate)
 256 {
 257         struct drm_plane_state *state = drm_plane->state;
 258         struct sti_plane *plane = to_sti_plane(drm_plane);
 259         struct sti_cursor *cursor = to_sti_cursor(plane);
 260         struct drm_crtc *crtc = state->crtc;
 261         struct drm_framebuffer *fb = state->fb;
 262         struct drm_display_mode *mode;
 263         int dst_x, dst_y;
 264         struct drm_gem_cma_object *cma_obj;
 265         u32 y, x;
 266         u32 val;
 267
 268         if (!crtc || !fb)
 269                 return;
 270
 271         mode = &crtc->mode;
 272         dst_x = state->crtc_x;
 273         dst_y = state->crtc_y;
 274
 275         cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 276
 277         /* Convert ARGB8888 to CLUT8 */
 278         sti_cursor_argb8888_to_clut8(cursor, (u32 *)cma_obj->vaddr);
 279
 280         /* AWS and AWE depend on the mode */
 281         y = sti_vtg_get_line_number(*mode, 0);
 282         x = sti_vtg_get_pixel_number(*mode, 0);
 283         val = y << 16 | x;
 284         writel(val, cursor->regs + CUR_AWS);
 285         y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
 286         x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
 287         val = y << 16 | x;
 288         writel(val, cursor->regs + CUR_AWE);
 289
 290         /* Set memory location, size, and position */
 291         writel(cursor->pixmap.paddr, cursor->regs + CUR_PML);
 292         writel(cursor->width, cursor->regs + CUR_PMP);
 293         writel(cursor->height << 16 | cursor->width, cursor->regs + CUR_SIZE);
 294
 295         y = sti_vtg_get_line_number(*mode, dst_y);
 296         x = sti_vtg_get_pixel_number(*mode, dst_x);
 297         writel((y << 16) | x, cursor->regs + CUR_VPO);
 298
 299         /* Set and fetch CLUT */
 300         writel(cursor->clut_paddr, cursor->regs + CUR_CML);
 301         writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
 302
 303         sti_plane_update_fps(plane, true, false);
 304
 305         plane->status = STI_PLANE_UPDATED;
 306 }
 307
 308 static void sti_cursor_atomic_disable(struct drm_plane *drm_plane,
 309                                       struct drm_plane_state *oldstate)
 310 {
 311         struct sti_plane *plane = to_sti_plane(drm_plane);
 312
 313         if (!oldstate->crtc) {
 314                 DRM_DEBUG_DRIVER("drm plane:%d not enabled\n",
 315                                  drm_plane->base.id);
 316                 return;
 317         }
 318
 319         DRM_DEBUG_DRIVER("CRTC:%d (%s) drm plane:%d (%s)\n",
 320                          oldstate->crtc->base.id,
 321                          sti_mixer_to_str(to_sti_mixer(oldstate->crtc)),
 322                          drm_plane->base.id, sti_plane_to_str(plane));
 323
 324         plane->status = STI_PLANE_DISABLING;
 325 }
 326
 327 static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
 328         .atomic_check = sti_cursor_atomic_check,
 329         .atomic_update = sti_cursor_atomic_update,
 330         .atomic_disable = sti_cursor_atomic_disable,
 331 };
 332
 333 static void sti_cursor_destroy(struct drm_plane *drm_plane)
 334 {
 335         DRM_DEBUG_DRIVER("\n");
 336
 337         drm_plane_cleanup(drm_plane);
 338 }
 339
 340 static int sti_cursor_late_register(struct drm_plane *drm_plane)
 341 {
 342         struct sti_plane *plane = to_sti_plane(drm_plane);
 343         struct sti_cursor *cursor = to_sti_cursor(plane);
 344
 345         return cursor_debugfs_init(cursor, drm_plane->dev->primary);
 346 }
 347
 348 static const struct drm_plane_funcs sti_cursor_plane_helpers_funcs = {
 349         .update_plane = drm_atomic_helper_update_plane,
 350         .disable_plane = drm_atomic_helper_disable_plane,
 351         .destroy = sti_cursor_destroy,
 352         .reset = sti_plane_reset,
 353         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 354         .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 355         .late_register = sti_cursor_late_register,
 356 };
 357
 358 struct drm_plane *sti_cursor_create(struct drm_device *drm_dev,
 359                                     struct device *dev, int desc,
 360                                     void __iomem *baseaddr,
 361                                     unsigned int possible_crtcs)
 362 {
 363         struct sti_cursor *cursor;
 364         size_t size;
 365         int res;
 366
 367         cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
 368         if (!cursor) {
 369                 DRM_ERROR("Failed to allocate memory for cursor\n");
 370                 return NULL;
 371         }
 372
 373         /* Allocate clut buffer */
 374         size = 0x100 * sizeof(unsigned short);
 375         cursor->clut = dma_alloc_wc(dev, size, &cursor->clut_paddr,
 376                                     GFP_KERNEL | GFP_DMA);
 377
 378         if (!cursor->clut) {
 379                 DRM_ERROR("Failed to allocate memory for cursor clut\n");
 380                 goto err_clut;
 381         }
 382
 383         cursor->dev = dev;
 384         cursor->regs = baseaddr;
 385         cursor->plane.desc = desc;
 386         cursor->plane.status = STI_PLANE_DISABLED;
 387
 388         sti_cursor_init(cursor);
 389
 390         res = drm_universal_plane_init(drm_dev, &cursor->plane.drm_plane,
 391                                        possible_crtcs,
 392                                        &sti_cursor_plane_helpers_funcs,
 393                                        cursor_supported_formats,
 394                                        ARRAY_SIZE(cursor_supported_formats),
 395                                        NULL, DRM_PLANE_TYPE_CURSOR, NULL);
 396         if (res) {
 397                 DRM_ERROR("Failed to initialize universal plane\n");
 398                 goto err_plane;
 399         }
 400
 401         drm_plane_helper_add(&cursor->plane.drm_plane,
 402                              &sti_cursor_helpers_funcs);
 403
 404         sti_plane_init_property(&cursor->plane, DRM_PLANE_TYPE_CURSOR);
 405
 406         return &cursor->plane.drm_plane;
 407
 408 err_plane:
 409         dma_free_wc(dev, size, cursor->clut, cursor->clut_paddr);
 410 err_clut:
 411         devm_kfree(dev, cursor);
 412         return NULL;
 413 }