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authorGerd Hoffmann <kraxel@redhat.com>2013-12-17 21:04:46 +0400
committerDave Airlie <airlied@redhat.com>2013-12-23 05:02:39 +0400
commit0a6659bdc5e8221da99eebb176fd9591435e38de (patch)
treea2f60a9d5c160721ac7405e5ed6b99c2a7073c2d /drivers/gpu/drm/bochs/bochs_kms.c
parent859ae233cd0ee76b6143f948ba1cb6b0b4c342f8 (diff)
downloadlinux-0a6659bdc5e8221da99eebb176fd9591435e38de.tar.xz
drm/bochs: new driver
DRM driver for (virtual) vga cards using the bochs dispi interface, such as the qemu standard vga (qemu -vga std). Don't bother supporting anything but 32bpp for now, even though the virtual hardware is able to do that. Known issue: mmap(/dev/fb0) doesn't work. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/bochs/bochs_kms.c')
-rw-r--r--drivers/gpu/drm/bochs/bochs_kms.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
new file mode 100644
index 000000000000..62ec7d4b3816
--- /dev/null
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -0,0 +1,294 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "bochs.h"
+
+static int defx = 1024;
+static int defy = 768;
+
+module_param(defx, int, 0444);
+module_param(defy, int, 0444);
+MODULE_PARM_DESC(defx, "default x resolution");
+MODULE_PARM_DESC(defy, "default y resolution");
+
+/* ---------------------------------------------------------------------- */
+
+static void bochs_crtc_load_lut(struct drm_crtc *crtc)
+{
+}
+
+static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+ switch (mode) {
+ case DRM_MODE_DPMS_ON:
+ case DRM_MODE_DPMS_STANDBY:
+ case DRM_MODE_DPMS_SUSPEND:
+ case DRM_MODE_DPMS_OFF:
+ default:
+ return;
+ }
+}
+
+static bool bochs_crtc_mode_fixup(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
+ struct drm_framebuffer *old_fb)
+{
+ struct bochs_device *bochs =
+ container_of(crtc, struct bochs_device, crtc);
+ struct bochs_framebuffer *bochs_fb;
+ struct bochs_bo *bo;
+ u64 gpu_addr = 0;
+ int ret;
+
+ if (old_fb) {
+ bochs_fb = to_bochs_framebuffer(old_fb);
+ bo = gem_to_bochs_bo(bochs_fb->obj);
+ ret = ttm_bo_reserve(&bo->bo, true, false, false, 0);
+ if (ret) {
+ DRM_ERROR("failed to reserve old_fb bo\n");
+ } else {
+ bochs_bo_unpin(bo);
+ ttm_bo_unreserve(&bo->bo);
+ }
+ }
+
+ if (WARN_ON(crtc->fb == NULL))
+ return -EINVAL;
+
+ bochs_fb = to_bochs_framebuffer(crtc->fb);
+ bo = gem_to_bochs_bo(bochs_fb->obj);
+ ret = ttm_bo_reserve(&bo->bo, true, false, false, 0);
+ if (ret)
+ return ret;
+
+ ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
+ if (ret) {
+ ttm_bo_unreserve(&bo->bo);
+ return ret;
+ }
+
+ ttm_bo_unreserve(&bo->bo);
+ bochs_hw_setbase(bochs, x, y, gpu_addr);
+ return 0;
+}
+
+static int bochs_crtc_mode_set(struct drm_crtc *crtc,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode,
+ int x, int y, struct drm_framebuffer *old_fb)
+{
+ struct bochs_device *bochs =
+ container_of(crtc, struct bochs_device, crtc);
+
+ bochs_hw_setmode(bochs, mode);
+ bochs_crtc_mode_set_base(crtc, x, y, old_fb);
+ return 0;
+}
+
+static void bochs_crtc_prepare(struct drm_crtc *crtc)
+{
+}
+
+static void bochs_crtc_commit(struct drm_crtc *crtc)
+{
+}
+
+static void bochs_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
+ u16 *blue, uint32_t start, uint32_t size)
+{
+}
+
+/* These provide the minimum set of functions required to handle a CRTC */
+static const struct drm_crtc_funcs bochs_crtc_funcs = {
+ .gamma_set = bochs_crtc_gamma_set,
+ .set_config = drm_crtc_helper_set_config,
+ .destroy = drm_crtc_cleanup,
+};
+
+static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
+ .dpms = bochs_crtc_dpms,
+ .mode_fixup = bochs_crtc_mode_fixup,
+ .mode_set = bochs_crtc_mode_set,
+ .mode_set_base = bochs_crtc_mode_set_base,
+ .prepare = bochs_crtc_prepare,
+ .commit = bochs_crtc_commit,
+ .load_lut = bochs_crtc_load_lut,
+};
+
+static void bochs_crtc_init(struct drm_device *dev)
+{
+ struct bochs_device *bochs = dev->dev_private;
+ struct drm_crtc *crtc = &bochs->crtc;
+
+ drm_crtc_init(dev, crtc, &bochs_crtc_funcs);
+ drm_mode_crtc_set_gamma_size(crtc, 256);
+ drm_crtc_helper_add(crtc, &bochs_helper_funcs);
+}
+
+static bool bochs_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void bochs_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+}
+
+static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
+{
+}
+
+static void bochs_encoder_prepare(struct drm_encoder *encoder)
+{
+}
+
+static void bochs_encoder_commit(struct drm_encoder *encoder)
+{
+}
+
+static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
+ .dpms = bochs_encoder_dpms,
+ .mode_fixup = bochs_encoder_mode_fixup,
+ .mode_set = bochs_encoder_mode_set,
+ .prepare = bochs_encoder_prepare,
+ .commit = bochs_encoder_commit,
+};
+
+static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static void bochs_encoder_init(struct drm_device *dev)
+{
+ struct bochs_device *bochs = dev->dev_private;
+ struct drm_encoder *encoder = &bochs->encoder;
+
+ encoder->possible_crtcs = 0x1;
+ drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
+ DRM_MODE_ENCODER_DAC);
+ drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
+}
+
+
+int bochs_connector_get_modes(struct drm_connector *connector)
+{
+ int count;
+
+ count = drm_add_modes_noedid(connector, 8192, 8192);
+ drm_set_preferred_mode(connector, defx, defy);
+ return count;
+}
+
+static int bochs_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct bochs_device *bochs =
+ container_of(connector, struct bochs_device, connector);
+ unsigned long size = mode->hdisplay * mode->vdisplay * 4;
+
+ /*
+ * Make sure we can fit two framebuffers into video memory.
+ * This allows up to 1600x1200 with 16 MB (default size).
+ * If you want more try this:
+ * 'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
+ */
+ if (size * 2 > bochs->fb_size)
+ return MODE_BAD;
+
+ return MODE_OK;
+}
+
+static struct drm_encoder *
+bochs_connector_best_encoder(struct drm_connector *connector)
+{
+ int enc_id = connector->encoder_ids[0];
+ struct drm_mode_object *obj;
+ struct drm_encoder *encoder;
+
+ /* pick the encoder ids */
+ if (enc_id) {
+ obj = drm_mode_object_find(connector->dev, enc_id,
+ DRM_MODE_OBJECT_ENCODER);
+ if (!obj)
+ return NULL;
+ encoder = obj_to_encoder(obj);
+ return encoder;
+ }
+ return NULL;
+}
+
+static enum drm_connector_status bochs_connector_detect(struct drm_connector
+ *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
+ .get_modes = bochs_connector_get_modes,
+ .mode_valid = bochs_connector_mode_valid,
+ .best_encoder = bochs_connector_best_encoder,
+};
+
+struct drm_connector_funcs bochs_connector_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .detect = bochs_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+};
+
+static void bochs_connector_init(struct drm_device *dev)
+{
+ struct bochs_device *bochs = dev->dev_private;
+ struct drm_connector *connector = &bochs->connector;
+
+ drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
+ DRM_MODE_CONNECTOR_VIRTUAL);
+ drm_connector_helper_add(connector,
+ &bochs_connector_connector_helper_funcs);
+}
+
+
+int bochs_kms_init(struct bochs_device *bochs)
+{
+ drm_mode_config_init(bochs->dev);
+ bochs->mode_config_initialized = true;
+
+ bochs->dev->mode_config.max_width = 8192;
+ bochs->dev->mode_config.max_height = 8192;
+
+ bochs->dev->mode_config.fb_base = bochs->fb_base;
+ bochs->dev->mode_config.preferred_depth = 24;
+ bochs->dev->mode_config.prefer_shadow = 0;
+
+ bochs->dev->mode_config.funcs = (void *)&bochs_mode_funcs;
+
+ bochs_crtc_init(bochs->dev);
+ bochs_encoder_init(bochs->dev);
+ bochs_connector_init(bochs->dev);
+ drm_mode_connector_attach_encoder(&bochs->connector,
+ &bochs->encoder);
+
+ return 0;
+}
+
+void bochs_kms_fini(struct bochs_device *bochs)
+{
+ if (bochs->mode_config_initialized) {
+ drm_mode_config_cleanup(bochs->dev);
+ bochs->mode_config_initialized = false;
+ }
+}