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
  10 static int defx = 1024;
  11 static int defy = 768;
  12
  13 module_param(defx, int, 0444);
  14 module_param(defy, int, 0444);
  15 MODULE_PARM_DESC(defx, "default x resolution");
  16 MODULE_PARM_DESC(defy, "default y resolution");
  17
  18 /* ---------------------------------------------------------------------- */
  19
  20 static void bochs_crtc_load_lut(struct drm_crtc *crtc)
  21 {
  22 }
  23
  24 static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
  25 {
  26         switch (mode) {
  27         case DRM_MODE_DPMS_ON:
  28         case DRM_MODE_DPMS_STANDBY:
  29         case DRM_MODE_DPMS_SUSPEND:
  30         case DRM_MODE_DPMS_OFF:
  31         default:
  32                 return;
  33         }
  34 }
  35
  36 static bool bochs_crtc_mode_fixup(struct drm_crtc *crtc,
  37                                   const struct drm_display_mode *mode,
  38                                   struct drm_display_mode *adjusted_mode)
  39 {
  40         return true;
  41 }
  42
  43 static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
  44                                     struct drm_framebuffer *old_fb)
  45 {
  46         struct bochs_device *bochs =
  47                 container_of(crtc, struct bochs_device, crtc);
  48         struct bochs_framebuffer *bochs_fb;
  49         struct bochs_bo *bo;
  50         u64 gpu_addr = 0;
  51         int ret;
  52
  53         if (old_fb) {
  54                 bochs_fb = to_bochs_framebuffer(old_fb);
  55                 bo = gem_to_bochs_bo(bochs_fb->obj);
  56                 ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  57                 if (ret) {
  58                         DRM_ERROR("failed to reserve old_fb bo\n");
  59                 } else {
  60                         bochs_bo_unpin(bo);
  61                         ttm_bo_unreserve(&bo->bo);
  62                 }
  63         }
  64
  65         if (WARN_ON(crtc->primary->fb == NULL))
  66                 return -EINVAL;
  67
  68         bochs_fb = to_bochs_framebuffer(crtc->primary->fb);
  69         bo = gem_to_bochs_bo(bochs_fb->obj);
  70         ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  71         if (ret)
  72                 return ret;
  73
  74         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
  75         if (ret) {
  76                 ttm_bo_unreserve(&bo->bo);
  77                 return ret;
  78         }
  79
  80         ttm_bo_unreserve(&bo->bo);
  81         bochs_hw_setbase(bochs, x, y, gpu_addr);
  82         return 0;
  83 }
  84
  85 static int bochs_crtc_mode_set(struct drm_crtc *crtc,
  86                                struct drm_display_mode *mode,
  87                                struct drm_display_mode *adjusted_mode,
  88                                int x, int y, struct drm_framebuffer *old_fb)
  89 {
  90         struct bochs_device *bochs =
  91                 container_of(crtc, struct bochs_device, crtc);
  92
  93         bochs_hw_setmode(bochs, mode);
  94         bochs_crtc_mode_set_base(crtc, x, y, old_fb);
  95         return 0;
  96 }
  97
  98 static void bochs_crtc_prepare(struct drm_crtc *crtc)
  99 {
 100 }
 101
 102 static void bochs_crtc_commit(struct drm_crtc *crtc)
 103 {
 104 }
 105
 106 static void bochs_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
 107                                  u16 *blue, uint32_t start, uint32_t size)
 108 {
 109 }
 110
 111 /* These provide the minimum set of functions required to handle a CRTC */
 112 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 113         .gamma_set = bochs_crtc_gamma_set,
 114         .set_config = drm_crtc_helper_set_config,
 115         .destroy = drm_crtc_cleanup,
 116 };
 117
 118 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 119         .dpms = bochs_crtc_dpms,
 120         .mode_fixup = bochs_crtc_mode_fixup,
 121         .mode_set = bochs_crtc_mode_set,
 122         .mode_set_base = bochs_crtc_mode_set_base,
 123         .prepare = bochs_crtc_prepare,
 124         .commit = bochs_crtc_commit,
 125         .load_lut = bochs_crtc_load_lut,
 126 };
 127
 128 static void bochs_crtc_init(struct drm_device *dev)
 129 {
 130         struct bochs_device *bochs = dev->dev_private;
 131         struct drm_crtc *crtc = &bochs->crtc;
 132
 133         drm_crtc_init(dev, crtc, &bochs_crtc_funcs);
 134         drm_mode_crtc_set_gamma_size(crtc, 256);
 135         drm_crtc_helper_add(crtc, &bochs_helper_funcs);
 136 }
 137
 138 static bool bochs_encoder_mode_fixup(struct drm_encoder *encoder,
 139                                      const struct drm_display_mode *mode,
 140                                      struct drm_display_mode *adjusted_mode)
 141 {
 142         return true;
 143 }
 144
 145 static void bochs_encoder_mode_set(struct drm_encoder *encoder,
 146                                    struct drm_display_mode *mode,
 147                                    struct drm_display_mode *adjusted_mode)
 148 {
 149 }
 150
 151 static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
 152 {
 153 }
 154
 155 static void bochs_encoder_prepare(struct drm_encoder *encoder)
 156 {
 157 }
 158
 159 static void bochs_encoder_commit(struct drm_encoder *encoder)
 160 {
 161 }
 162
 163 static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
 164         .dpms = bochs_encoder_dpms,
 165         .mode_fixup = bochs_encoder_mode_fixup,
 166         .mode_set = bochs_encoder_mode_set,
 167         .prepare = bochs_encoder_prepare,
 168         .commit = bochs_encoder_commit,
 169 };
 170
 171 static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
 172         .destroy = drm_encoder_cleanup,
 173 };
 174
 175 static void bochs_encoder_init(struct drm_device *dev)
 176 {
 177         struct bochs_device *bochs = dev->dev_private;
 178         struct drm_encoder *encoder = &bochs->encoder;
 179
 180         encoder->possible_crtcs = 0x1;
 181         drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
 182                          DRM_MODE_ENCODER_DAC);
 183         drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
 184 }
 185
 186
 187 int bochs_connector_get_modes(struct drm_connector *connector)
 188 {
 189         int count;
 190
 191         count = drm_add_modes_noedid(connector, 8192, 8192);
 192         drm_set_preferred_mode(connector, defx, defy);
 193         return count;
 194 }
 195
 196 static int bochs_connector_mode_valid(struct drm_connector *connector,
 197                                       struct drm_display_mode *mode)
 198 {
 199         struct bochs_device *bochs =
 200                 container_of(connector, struct bochs_device, connector);
 201         unsigned long size = mode->hdisplay * mode->vdisplay * 4;
 202
 203         /*
 204          * Make sure we can fit two framebuffers into video memory.
 205          * This allows up to 1600x1200 with 16 MB (default size).
 206          * If you want more try this:
 207          *     'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
 208          */
 209         if (size * 2 > bochs->fb_size)
 210                 return MODE_BAD;
 211
 212         return MODE_OK;
 213 }
 214
 215 static struct drm_encoder *
 216 bochs_connector_best_encoder(struct drm_connector *connector)
 217 {
 218         int enc_id = connector->encoder_ids[0];
 219         /* pick the encoder ids */
 220         if (enc_id)
 221                 return drm_encoder_find(connector->dev, enc_id);
 222         return NULL;
 223 }
 224
 225 static enum drm_connector_status bochs_connector_detect(struct drm_connector
 226                                                         *connector, bool force)
 227 {
 228         return connector_status_connected;
 229 }
 230
 231 struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
 232         .get_modes = bochs_connector_get_modes,
 233         .mode_valid = bochs_connector_mode_valid,
 234         .best_encoder = bochs_connector_best_encoder,
 235 };
 236
 237 struct drm_connector_funcs bochs_connector_connector_funcs = {
 238         .dpms = drm_helper_connector_dpms,
 239         .detect = bochs_connector_detect,
 240         .fill_modes = drm_helper_probe_single_connector_modes,
 241         .destroy = drm_connector_cleanup,
 242 };
 243
 244 static void bochs_connector_init(struct drm_device *dev)
 245 {
 246         struct bochs_device *bochs = dev->dev_private;
 247         struct drm_connector *connector = &bochs->connector;
 248
 249         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 250                            DRM_MODE_CONNECTOR_VIRTUAL);
 251         drm_connector_helper_add(connector,
 252                                  &bochs_connector_connector_helper_funcs);
 253         drm_connector_register(connector);
 254 }
 255
 256
 257 int bochs_kms_init(struct bochs_device *bochs)
 258 {
 259         drm_mode_config_init(bochs->dev);
 260         bochs->mode_config_initialized = true;
 261
 262         bochs->dev->mode_config.max_width = 8192;
 263         bochs->dev->mode_config.max_height = 8192;
 264
 265         bochs->dev->mode_config.fb_base = bochs->fb_base;
 266         bochs->dev->mode_config.preferred_depth = 24;
 267         bochs->dev->mode_config.prefer_shadow = 0;
 268
 269         bochs->dev->mode_config.funcs = (void *)&bochs_mode_funcs;
 270
 271         bochs_crtc_init(bochs->dev);
 272         bochs_encoder_init(bochs->dev);
 273         bochs_connector_init(bochs->dev);
 274         drm_mode_connector_attach_encoder(&bochs->connector,
 275                                           &bochs->encoder);
 276
 277         return 0;
 278 }
 279
 280 void bochs_kms_fini(struct bochs_device *bochs)
 281 {
 282         if (bochs->mode_config_initialized) {
 283                 drm_mode_config_cleanup(bochs->dev);
 284                 bochs->mode_config_initialized = false;
 285         }
 286 }