drivers/gpu/drm/sti/sti_cursor.c

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