kernel/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 bool bochs_crtc_mode_fixup(struct drm_crtc *crtc,
  34                                   const struct drm_display_mode *mode,
  35                                   struct drm_display_mode *adjusted_mode)
  36 {
  37         return true;
  38 }
  39
  40 static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
  41                                     struct drm_framebuffer *old_fb)
  42 {
  43         struct bochs_device *bochs =
  44                 container_of(crtc, struct bochs_device, crtc);
  45         struct bochs_framebuffer *bochs_fb;
  46         struct bochs_bo *bo;
  47         u64 gpu_addr = 0;
  48         int ret;
  49
  50         if (old_fb) {
  51                 bochs_fb = to_bochs_framebuffer(old_fb);
  52                 bo = gem_to_bochs_bo(bochs_fb->obj);
  53                 ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  54                 if (ret) {
  55                         DRM_ERROR("failed to reserve old_fb bo\n");
  56                 } else {
  57                         bochs_bo_unpin(bo);
  58                         ttm_bo_unreserve(&bo->bo);
  59                 }
  60         }
  61
  62         if (WARN_ON(crtc->primary->fb == NULL))
  63                 return -EINVAL;
  64
  65         bochs_fb = to_bochs_framebuffer(crtc->primary->fb);
  66         bo = gem_to_bochs_bo(bochs_fb->obj);
  67         ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  68         if (ret)
  69                 return ret;
  70
  71         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
  72         if (ret) {
  73                 ttm_bo_unreserve(&bo->bo);
  74                 return ret;
  75         }
  76
  77         ttm_bo_unreserve(&bo->bo);
  78         bochs_hw_setbase(bochs, x, y, gpu_addr);
  79         return 0;
  80 }
  81
  82 static int bochs_crtc_mode_set(struct drm_crtc *crtc,
  83                                struct drm_display_mode *mode,
  84                                struct drm_display_mode *adjusted_mode,
  85                                int x, int y, struct drm_framebuffer *old_fb)
  86 {
  87         struct bochs_device *bochs =
  88                 container_of(crtc, struct bochs_device, crtc);
  89
  90         bochs_hw_setmode(bochs, mode);
  91         bochs_crtc_mode_set_base(crtc, x, y, old_fb);
  92         return 0;
  93 }
  94
  95 static void bochs_crtc_prepare(struct drm_crtc *crtc)
  96 {
  97 }
  98
  99 static void bochs_crtc_commit(struct drm_crtc *crtc)
 100 {
 101 }
 102
 103 static void bochs_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
 104                                  u16 *blue, uint32_t start, uint32_t size)
 105 {
 106 }
 107
 108 static int bochs_crtc_page_flip(struct drm_crtc *crtc,
 109                                 struct drm_framebuffer *fb,
 110                                 struct drm_pending_vblank_event *event,
 111                                 uint32_t page_flip_flags)
 112 {
 113         struct bochs_device *bochs =
 114                 container_of(crtc, struct bochs_device, crtc);
 115         struct drm_framebuffer *old_fb = crtc->primary->fb;
 116         unsigned long irqflags;
 117
 118         crtc->primary->fb = fb;
 119         bochs_crtc_mode_set_base(crtc, 0, 0, old_fb);
 120         if (event) {
 121                 spin_lock_irqsave(&bochs->dev->event_lock, irqflags);
 122                 drm_send_vblank_event(bochs->dev, -1, event);
 123                 spin_unlock_irqrestore(&bochs->dev->event_lock, irqflags);
 124         }
 125         return 0;
 126 }
 127
 128 /* These provide the minimum set of functions required to handle a CRTC */
 129 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 130         .gamma_set = bochs_crtc_gamma_set,
 131         .set_config = drm_crtc_helper_set_config,
 132         .destroy = drm_crtc_cleanup,
 133         .page_flip = bochs_crtc_page_flip,
 134 };
 135
 136 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 137         .dpms = bochs_crtc_dpms,
 138         .mode_fixup = bochs_crtc_mode_fixup,
 139         .mode_set = bochs_crtc_mode_set,
 140         .mode_set_base = bochs_crtc_mode_set_base,
 141         .prepare = bochs_crtc_prepare,
 142         .commit = bochs_crtc_commit,
 143 };
 144
 145 static void bochs_crtc_init(struct drm_device *dev)
 146 {
 147         struct bochs_device *bochs = dev->dev_private;
 148         struct drm_crtc *crtc = &bochs->crtc;
 149
 150         drm_crtc_init(dev, crtc, &bochs_crtc_funcs);
 151         drm_mode_crtc_set_gamma_size(crtc, 256);
 152         drm_crtc_helper_add(crtc, &bochs_helper_funcs);
 153 }
 154
 155 static bool bochs_encoder_mode_fixup(struct drm_encoder *encoder,
 156                                      const struct drm_display_mode *mode,
 157                                      struct drm_display_mode *adjusted_mode)
 158 {
 159         return true;
 160 }
 161
 162 static void bochs_encoder_mode_set(struct drm_encoder *encoder,
 163                                    struct drm_display_mode *mode,
 164                                    struct drm_display_mode *adjusted_mode)
 165 {
 166 }
 167
 168 static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
 169 {
 170 }
 171
 172 static void bochs_encoder_prepare(struct drm_encoder *encoder)
 173 {
 174 }
 175
 176 static void bochs_encoder_commit(struct drm_encoder *encoder)
 177 {
 178 }
 179
 180 static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
 181         .dpms = bochs_encoder_dpms,
 182         .mode_fixup = bochs_encoder_mode_fixup,
 183         .mode_set = bochs_encoder_mode_set,
 184         .prepare = bochs_encoder_prepare,
 185         .commit = bochs_encoder_commit,
 186 };
 187
 188 static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
 189         .destroy = drm_encoder_cleanup,
 190 };
 191
 192 static void bochs_encoder_init(struct drm_device *dev)
 193 {
 194         struct bochs_device *bochs = dev->dev_private;
 195         struct drm_encoder *encoder = &bochs->encoder;
 196
 197         encoder->possible_crtcs = 0x1;
 198         drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
 199                          DRM_MODE_ENCODER_DAC);
 200         drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
 201 }
 202
 203
 204 int bochs_connector_get_modes(struct drm_connector *connector)
 205 {
 206         int count;
 207
 208         count = drm_add_modes_noedid(connector, 8192, 8192);
 209         drm_set_preferred_mode(connector, defx, defy);
 210         return count;
 211 }
 212
 213 static int bochs_connector_mode_valid(struct drm_connector *connector,
 214                                       struct drm_display_mode *mode)
 215 {
 216         struct bochs_device *bochs =
 217                 container_of(connector, struct bochs_device, connector);
 218         unsigned long size = mode->hdisplay * mode->vdisplay * 4;
 219
 220         /*
 221          * Make sure we can fit two framebuffers into video memory.
 222          * This allows up to 1600x1200 with 16 MB (default size).
 223          * If you want more try this:
 224          *     'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
 225          */
 226         if (size * 2 > bochs->fb_size)
 227                 return MODE_BAD;
 228
 229         return MODE_OK;
 230 }
 231
 232 static struct drm_encoder *
 233 bochs_connector_best_encoder(struct drm_connector *connector)
 234 {
 235         int enc_id = connector->encoder_ids[0];
 236         /* pick the encoder ids */
 237         if (enc_id)
 238                 return drm_encoder_find(connector->dev, enc_id);
 239         return NULL;
 240 }
 241
 242 static enum drm_connector_status bochs_connector_detect(struct drm_connector
 243                                                         *connector, bool force)
 244 {
 245         return connector_status_connected;
 246 }
 247
 248 struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
 249         .get_modes = bochs_connector_get_modes,
 250         .mode_valid = bochs_connector_mode_valid,
 251         .best_encoder = bochs_connector_best_encoder,
 252 };
 253
 254 struct drm_connector_funcs bochs_connector_connector_funcs = {
 255         .dpms = drm_helper_connector_dpms,
 256         .detect = bochs_connector_detect,
 257         .fill_modes = drm_helper_probe_single_connector_modes,
 258         .destroy = drm_connector_cleanup,
 259 };
 260
 261 static void bochs_connector_init(struct drm_device *dev)
 262 {
 263         struct bochs_device *bochs = dev->dev_private;
 264         struct drm_connector *connector = &bochs->connector;
 265
 266         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 267                            DRM_MODE_CONNECTOR_VIRTUAL);
 268         drm_connector_helper_add(connector,
 269                                  &bochs_connector_connector_helper_funcs);
 270         drm_connector_register(connector);
 271 }
 272
 273
 274 int bochs_kms_init(struct bochs_device *bochs)
 275 {
 276         drm_mode_config_init(bochs->dev);
 277         bochs->mode_config_initialized = true;
 278
 279         bochs->dev->mode_config.max_width = 8192;
 280         bochs->dev->mode_config.max_height = 8192;
 281
 282         bochs->dev->mode_config.fb_base = bochs->fb_base;
 283         bochs->dev->mode_config.preferred_depth = 24;
 284         bochs->dev->mode_config.prefer_shadow = 0;
 285
 286         bochs->dev->mode_config.funcs = (void *)&bochs_mode_funcs;
 287
 288         bochs_crtc_init(bochs->dev);
 289         bochs_encoder_init(bochs->dev);
 290         bochs_connector_init(bochs->dev);
 291         drm_mode_connector_attach_encoder(&bochs->connector,
 292                                           &bochs->encoder);
 293
 294         return 0;
 295 }
 296
 297 void bochs_kms_fini(struct bochs_device *bochs)
 298 {
 299         if (bochs->mode_config_initialized) {
 300                 drm_mode_config_cleanup(bochs->dev);
 301                 bochs->mode_config_initialized = false;
 302         }
 303 }