drivers/gpu/drm/bochs/bochs_kms.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9 #include <drm/drm_plane_helper.h>
  10
  11 static int defx = 1024;
  12 static int defy = 768;
  13
  14 module_param(defx, int, 0444);
  15 module_param(defy, int, 0444);
  16 MODULE_PARM_DESC(defx, "default x resolution");
  17 MODULE_PARM_DESC(defy, "default y resolution");
  18
  19 /* ---------------------------------------------------------------------- */
  20
  21 static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
  22 {
  23         switch (mode) {
  24         case DRM_MODE_DPMS_ON:
  25         case DRM_MODE_DPMS_STANDBY:
  26         case DRM_MODE_DPMS_SUSPEND:
  27         case DRM_MODE_DPMS_OFF:
  28         default:
  29                 return;
  30         }
  31 }
  32
  33 static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
  34                                     struct drm_framebuffer *old_fb)
  35 {
  36         struct bochs_device *bochs =
  37                 container_of(crtc, struct bochs_device, crtc);
  38         struct bochs_bo *bo;
  39         u64 gpu_addr = 0;
  40         int ret;
  41
  42         if (old_fb) {
  43                 bo = gem_to_bochs_bo(old_fb->obj[0]);
  44                 ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  45                 if (ret) {
  46                         DRM_ERROR("failed to reserve old_fb bo\n");
  47                 } else {
  48                         bochs_bo_unpin(bo);
  49                         ttm_bo_unreserve(&bo->bo);
  50                 }
  51         }
  52
  53         if (WARN_ON(crtc->primary->fb == NULL))
  54                 return -EINVAL;
  55
  56         bo = gem_to_bochs_bo(crtc->primary->fb->obj[0]);
  57         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  58         if (ret)
  59                 return ret;
  60
  61         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
  62         if (ret) {
  63                 ttm_bo_unreserve(&bo->bo);
  64                 return ret;
  65         }
  66
  67         ttm_bo_unreserve(&bo->bo);
  68         bochs_hw_setbase(bochs, x, y, gpu_addr);
  69         return 0;
  70 }
  71
  72 static int bochs_crtc_mode_set(struct drm_crtc *crtc,
  73                                struct drm_display_mode *mode,
  74                                struct drm_display_mode *adjusted_mode,
  75                                int x, int y, struct drm_framebuffer *old_fb)
  76 {
  77         struct bochs_device *bochs =
  78                 container_of(crtc, struct bochs_device, crtc);
  79
  80         if (WARN_ON(crtc->primary->fb == NULL))
  81                 return -EINVAL;
  82
  83         bochs_hw_setmode(bochs, mode, crtc->primary->fb->format);
  84         bochs_crtc_mode_set_base(crtc, x, y, old_fb);
  85         return 0;
  86 }
  87
  88 static void bochs_crtc_prepare(struct drm_crtc *crtc)
  89 {
  90 }
  91
  92 static void bochs_crtc_commit(struct drm_crtc *crtc)
  93 {
  94 }
  95
  96 static int bochs_crtc_page_flip(struct drm_crtc *crtc,
  97                                 struct drm_framebuffer *fb,
  98                                 struct drm_pending_vblank_event *event,
  99                                 uint32_t page_flip_flags,
 100                                 struct drm_modeset_acquire_ctx *ctx)
 101 {
 102         struct bochs_device *bochs =
 103                 container_of(crtc, struct bochs_device, crtc);
 104         struct drm_framebuffer *old_fb = crtc->primary->fb;
 105         unsigned long irqflags;
 106
 107         crtc->primary->fb = fb;
 108         bochs_crtc_mode_set_base(crtc, 0, 0, old_fb);
 109         if (event) {
 110                 spin_lock_irqsave(&bochs->dev->event_lock, irqflags);
 111                 drm_crtc_send_vblank_event(crtc, event);
 112                 spin_unlock_irqrestore(&bochs->dev->event_lock, irqflags);
 113         }
 114         return 0;
 115 }
 116
 117 /* These provide the minimum set of functions required to handle a CRTC */
 118 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 119         .set_config = drm_crtc_helper_set_config,
 120         .destroy = drm_crtc_cleanup,
 121         .page_flip = bochs_crtc_page_flip,
 122 };
 123
 124 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 125         .dpms = bochs_crtc_dpms,
 126         .mode_set = bochs_crtc_mode_set,
 127         .mode_set_base = bochs_crtc_mode_set_base,
 128         .prepare = bochs_crtc_prepare,
 129         .commit = bochs_crtc_commit,
 130 };
 131
 132 static const uint32_t bochs_formats[] = {
 133         DRM_FORMAT_XRGB8888,
 134         DRM_FORMAT_BGRX8888,
 135 };
 136
 137 static struct drm_plane *bochs_primary_plane(struct drm_device *dev)
 138 {
 139         struct drm_plane *primary;
 140         int ret;
 141
 142         primary = kzalloc(sizeof(*primary), GFP_KERNEL);
 143         if (primary == NULL) {
 144                 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
 145                 return NULL;
 146         }
 147
 148         ret = drm_universal_plane_init(dev, primary, 0,
 149                                        &drm_primary_helper_funcs,
 150                                        bochs_formats,
 151                                        ARRAY_SIZE(bochs_formats),
 152                                        NULL,
 153                                        DRM_PLANE_TYPE_PRIMARY, NULL);
 154         if (ret) {
 155                 kfree(primary);
 156                 primary = NULL;
 157         }
 158
 159         return primary;
 160 }
 161
 162 static void bochs_crtc_init(struct drm_device *dev)
 163 {
 164         struct bochs_device *bochs = dev->dev_private;
 165         struct drm_crtc *crtc = &bochs->crtc;
 166         struct drm_plane *primary = bochs_primary_plane(dev);
 167
 168         drm_crtc_init_with_planes(dev, crtc, primary, NULL,
 169                                   &bochs_crtc_funcs, NULL);
 170         drm_crtc_helper_add(crtc, &bochs_helper_funcs);
 171 }
 172
 173 static void bochs_encoder_mode_set(struct drm_encoder *encoder,
 174                                    struct drm_display_mode *mode,
 175                                    struct drm_display_mode *adjusted_mode)
 176 {
 177 }
 178
 179 static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
 180 {
 181 }
 182
 183 static void bochs_encoder_prepare(struct drm_encoder *encoder)
 184 {
 185 }
 186
 187 static void bochs_encoder_commit(struct drm_encoder *encoder)
 188 {
 189 }
 190
 191 static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
 192         .dpms = bochs_encoder_dpms,
 193         .mode_set = bochs_encoder_mode_set,
 194         .prepare = bochs_encoder_prepare,
 195         .commit = bochs_encoder_commit,
 196 };
 197
 198 static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
 199         .destroy = drm_encoder_cleanup,
 200 };
 201
 202 static void bochs_encoder_init(struct drm_device *dev)
 203 {
 204         struct bochs_device *bochs = dev->dev_private;
 205         struct drm_encoder *encoder = &bochs->encoder;
 206
 207         encoder->possible_crtcs = 0x1;
 208         drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
 209                          DRM_MODE_ENCODER_DAC, NULL);
 210         drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
 211 }
 212
 213
 214 static int bochs_connector_get_modes(struct drm_connector *connector)
 215 {
 216         int count;
 217
 218         count = drm_add_modes_noedid(connector, 8192, 8192);
 219         drm_set_preferred_mode(connector, defx, defy);
 220         return count;
 221 }
 222
 223 static enum drm_mode_status bochs_connector_mode_valid(struct drm_connector *connector,
 224                                       struct drm_display_mode *mode)
 225 {
 226         struct bochs_device *bochs =
 227                 container_of(connector, struct bochs_device, connector);
 228         unsigned long size = mode->hdisplay * mode->vdisplay * 4;
 229
 230         /*
 231          * Make sure we can fit two framebuffers into video memory.
 232          * This allows up to 1600x1200 with 16 MB (default size).
 233          * If you want more try this:
 234          *     'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
 235          */
 236         if (size * 2 > bochs->fb_size)
 237                 return MODE_BAD;
 238
 239         return MODE_OK;
 240 }
 241
 242 static struct drm_encoder *
 243 bochs_connector_best_encoder(struct drm_connector *connector)
 244 {
 245         int enc_id = connector->encoder_ids[0];
 246         /* pick the encoder ids */
 247         if (enc_id)
 248                 return drm_encoder_find(connector->dev, NULL, enc_id);
 249         return NULL;
 250 }
 251
 252 static const struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
 253         .get_modes = bochs_connector_get_modes,
 254         .mode_valid = bochs_connector_mode_valid,
 255         .best_encoder = bochs_connector_best_encoder,
 256 };
 257
 258 static const struct drm_connector_funcs bochs_connector_connector_funcs = {
 259         .dpms = drm_helper_connector_dpms,
 260         .fill_modes = drm_helper_probe_single_connector_modes,
 261         .destroy = drm_connector_cleanup,
 262 };
 263
 264 static void bochs_connector_init(struct drm_device *dev)
 265 {
 266         struct bochs_device *bochs = dev->dev_private;
 267         struct drm_connector *connector = &bochs->connector;
 268
 269         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 270                            DRM_MODE_CONNECTOR_VIRTUAL);
 271         drm_connector_helper_add(connector,
 272                                  &bochs_connector_connector_helper_funcs);
 273         drm_connector_register(connector);
 274 }
 275
 276
 277 int bochs_kms_init(struct bochs_device *bochs)
 278 {
 279         drm_mode_config_init(bochs->dev);
 280         bochs->mode_config_initialized = true;
 281
 282         bochs->dev->mode_config.max_width = 8192;
 283         bochs->dev->mode_config.max_height = 8192;
 284
 285         bochs->dev->mode_config.fb_base = bochs->fb_base;
 286         bochs->dev->mode_config.preferred_depth = 24;
 287         bochs->dev->mode_config.prefer_shadow = 0;
 288         bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 289
 290         bochs->dev->mode_config.funcs = &bochs_mode_funcs;
 291
 292         bochs_crtc_init(bochs->dev);
 293         bochs_encoder_init(bochs->dev);
 294         bochs_connector_init(bochs->dev);
 295         drm_connector_attach_encoder(&bochs->connector,
 296                                           &bochs->encoder);
 297
 298         return 0;
 299 }
 300
 301 void bochs_kms_fini(struct bochs_device *bochs)
 302 {
 303         if (bochs->mode_config_initialized) {
 304                 drm_mode_config_cleanup(bochs->dev);
 305                 bochs->mode_config_initialized = false;
 306         }
 307 }