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