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 #include <drm/drmP.h>
   9
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_fb_cma_helper.h>
  12 #include <drm/drm_gem_cma_helper.h>
  13 #include <drm/drm_plane_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 stucture
  37  *
  38  * @paddr:  physical address
  39  * @size:   buffer size
  40  * @base:   virtual address
  41  */
  42 struct 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  */
  60 struct 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
  71 static 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 static void sti_cursor_argb8888_to_clut8(struct sti_cursor *cursor, u32 *src)
  78 {
  79         u8  *dst = cursor->pixmap.base;
  80         unsigned int i, j;
  81         u32 a, r, g, b;
  82
  83         for (i = 0; i < cursor->height; i++) {
  84                 for (j = 0; j < cursor->width; j++) {
  85                         /* Pick the 2 higher bits of each component */
  86                         a = (*src >> 30) & 3;
  87                         r = (*src >> 22) & 3;
  88                         g = (*src >> 14) & 3;
  89                         b = (*src >> 6) & 3;
  90                         *dst = a << 6 | r << 4 | g << 2 | b;
  91                         src++;
  92                         dst++;
  93                 }
  94         }
  95 }
  96
  97 static void sti_cursor_init(struct sti_cursor *cursor)
  98 {
  99         unsigned short *base = cursor->clut;
 100         unsigned int a, r, g, b;
 101
 102         /* Assign CLUT values, ARGB444 format */
 103         for (a = 0; a < 4; a++)
 104                 for (r = 0; r < 4; r++)
 105                         for (g = 0; g < 4; g++)
 106                                 for (b = 0; b < 4; b++)
 107                                         *base++ = (a * 5) << 12 |
 108                                                   (r * 5) << 8 |
 109                                                   (g * 5) << 4 |
 110                                                   (b * 5);
 111 }
 112
 113 static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 114                                      struct drm_plane_state *oldstate)
 115 {
 116         struct drm_plane_state *state = drm_plane->state;
 117         struct sti_plane *plane = to_sti_plane(drm_plane);
 118         struct sti_cursor *cursor = to_sti_cursor(plane);
 119         struct drm_crtc *crtc = state->crtc;
 120         struct sti_mixer *mixer = to_sti_mixer(crtc);
 121         struct drm_framebuffer *fb = state->fb;
 122         struct drm_display_mode *mode = &crtc->mode;
 123         int dst_x = state->crtc_x;
 124         int dst_y = state->crtc_y;
 125         int dst_w = clamp_val(state->crtc_w, 0, mode->crtc_hdisplay - dst_x);
 126         int dst_h = clamp_val(state->crtc_h, 0, mode->crtc_vdisplay - dst_y);
 127         /* src_x are in 16.16 format */
 128         int src_w = state->src_w >> 16;
 129         int src_h = state->src_h >> 16;
 130         bool first_prepare = plane->status == STI_PLANE_DISABLED ? true : false;
 131         struct drm_gem_cma_object *cma_obj;
 132         u32 y, x;
 133         u32 val;
 134
 135         DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
 136                       crtc->base.id, sti_mixer_to_str(mixer),
 137                       drm_plane->base.id, sti_plane_to_str(plane));
 138         DRM_DEBUG_KMS("(%dx%d)@(%d,%d)\n", dst_w, dst_h, dst_x, dst_y);
 139
 140         dev_dbg(cursor->dev, "%s %s\n", __func__,
 141                 sti_plane_to_str(plane));
 142
 143         if (src_w < STI_CURS_MIN_SIZE ||
 144             src_h < STI_CURS_MIN_SIZE ||
 145             src_w > STI_CURS_MAX_SIZE ||
 146             src_h > STI_CURS_MAX_SIZE) {
 147                 DRM_ERROR("Invalid cursor size (%dx%d)\n",
 148                                 src_w, src_h);
 149                 return;
 150         }
 151
 152         /* If the cursor size has changed, re-allocated the pixmap */
 153         if (!cursor->pixmap.base ||
 154             (cursor->width != src_w) ||
 155             (cursor->height != src_h)) {
 156                 cursor->width = src_w;
 157                 cursor->height = src_h;
 158
 159                 if (cursor->pixmap.base)
 160                         dma_free_writecombine(cursor->dev,
 161                                               cursor->pixmap.size,
 162                                               cursor->pixmap.base,
 163                                               cursor->pixmap.paddr);
 164
 165                 cursor->pixmap.size = cursor->width * cursor->height;
 166
 167                 cursor->pixmap.base = dma_alloc_writecombine(cursor->dev,
 168                                                         cursor->pixmap.size,
 169                                                         &cursor->pixmap.paddr,
 170                                                         GFP_KERNEL | GFP_DMA);
 171                 if (!cursor->pixmap.base) {
 172                         DRM_ERROR("Failed to allocate memory for pixmap\n");
 173                         return;
 174                 }
 175         }
 176
 177         cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 178         if (!cma_obj) {
 179                 DRM_ERROR("Can't get CMA GEM object for fb\n");
 180                 return;
 181         }
 182
 183         /* Convert ARGB8888 to CLUT8 */
 184         sti_cursor_argb8888_to_clut8(cursor, (u32 *)cma_obj->vaddr);
 185
 186         /* AWS and AWE depend on the mode */
 187         y = sti_vtg_get_line_number(*mode, 0);
 188         x = sti_vtg_get_pixel_number(*mode, 0);
 189         val = y << 16 | x;
 190         writel(val, cursor->regs + CUR_AWS);
 191         y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
 192         x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
 193         val = y << 16 | x;
 194         writel(val, cursor->regs + CUR_AWE);
 195
 196         if (first_prepare) {
 197                 /* Set and fetch CLUT */
 198                 writel(cursor->clut_paddr, cursor->regs + CUR_CML);
 199                 writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
 200         }
 201
 202         /* Set memory location, size, and position */
 203         writel(cursor->pixmap.paddr, cursor->regs + CUR_PML);
 204         writel(cursor->width, cursor->regs + CUR_PMP);
 205         writel(cursor->height << 16 | cursor->width, cursor->regs + CUR_SIZE);
 206
 207         y = sti_vtg_get_line_number(*mode, dst_y);
 208         x = sti_vtg_get_pixel_number(*mode, dst_y);
 209         writel((y << 16) | x, cursor->regs + CUR_VPO);
 210
 211         plane->status = STI_PLANE_UPDATED;
 212 }
 213
 214 static void sti_cursor_atomic_disable(struct drm_plane *drm_plane,
 215                                       struct drm_plane_state *oldstate)
 216 {
 217         struct sti_plane *plane = to_sti_plane(drm_plane);
 218         struct sti_mixer *mixer = to_sti_mixer(drm_plane->crtc);
 219
 220         if (!drm_plane->crtc) {
 221                 DRM_DEBUG_DRIVER("drm plane:%d not enabled\n",
 222                                  drm_plane->base.id);
 223                 return;
 224         }
 225
 226         DRM_DEBUG_DRIVER("CRTC:%d (%s) drm plane:%d (%s)\n",
 227                          drm_plane->crtc->base.id, sti_mixer_to_str(mixer),
 228                          drm_plane->base.id, sti_plane_to_str(plane));
 229
 230         plane->status = STI_PLANE_DISABLING;
 231 }
 232
 233 static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
 234         .atomic_update = sti_cursor_atomic_update,
 235         .atomic_disable = sti_cursor_atomic_disable,
 236 };
 237
 238 struct drm_plane *sti_cursor_create(struct drm_device *drm_dev,
 239                                     struct device *dev, int desc,
 240                                     void __iomem *baseaddr,
 241                                     unsigned int possible_crtcs)
 242 {
 243         struct sti_cursor *cursor;
 244         size_t size;
 245         int res;
 246
 247         cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
 248         if (!cursor) {
 249                 DRM_ERROR("Failed to allocate memory for cursor\n");
 250                 return NULL;
 251         }
 252
 253         /* Allocate clut buffer */
 254         size = 0x100 * sizeof(unsigned short);
 255         cursor->clut = dma_alloc_writecombine(dev, size, &cursor->clut_paddr,
 256                                               GFP_KERNEL | GFP_DMA);
 257
 258         if (!cursor->clut) {
 259                 DRM_ERROR("Failed to allocate memory for cursor clut\n");
 260                 goto err_clut;
 261         }
 262
 263         cursor->dev = dev;
 264         cursor->regs = baseaddr;
 265         cursor->plane.desc = desc;
 266         cursor->plane.status = STI_PLANE_DISABLED;
 267
 268         sti_cursor_init(cursor);
 269
 270         res = drm_universal_plane_init(drm_dev, &cursor->plane.drm_plane,
 271                                        possible_crtcs,
 272                                        &sti_plane_helpers_funcs,
 273                                        cursor_supported_formats,
 274                                        ARRAY_SIZE(cursor_supported_formats),
 275                                        DRM_PLANE_TYPE_CURSOR);
 276         if (res) {
 277                 DRM_ERROR("Failed to initialize universal plane\n");
 278                 goto err_plane;
 279         }
 280
 281         drm_plane_helper_add(&cursor->plane.drm_plane,
 282                              &sti_cursor_helpers_funcs);
 283
 284         sti_plane_init_property(&cursor->plane, DRM_PLANE_TYPE_CURSOR);
 285
 286         return &cursor->plane.drm_plane;
 287
 288 err_plane:
 289         dma_free_writecombine(dev, size, cursor->clut, cursor->clut_paddr);
 290 err_clut:
 291         devm_kfree(dev, cursor);
 292         return NULL;
 293 }