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