Right now, all we need to know about the blitter is that it's not doing
anything that can be messed up when fiddling with MMU mappings.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
---
drivers/gpu/drm/gma500/Makefile | 1 +
drivers/gpu/drm/gma500/blitter.c | 47 ++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/gma500/blitter.h | 22 +++++++++++++++++++
3 files changed, 70 insertions(+)
create mode 100644 drivers/gpu/drm/gma500/blitter.c
create mode 100644 drivers/gpu/drm/gma500/blitter.h
diff --git a/drivers/gpu/drm/gma500/Makefile b/drivers/gpu/drm/gma500/Makefile
index e9064dd..69c0d7f 100644
--- a/drivers/gpu/drm/gma500/Makefile
+++ b/drivers/gpu/drm/gma500/Makefile
@@ -13,6 +13,7 @@ gma500_gfx-y += \
intel_i2c.o \
intel_gmbus.o \
mmu.o \
+ blitter.o \
power.o \
psb_drv.o \
gma_display.o \
diff --git a/drivers/gpu/drm/gma500/blitter.c b/drivers/gpu/drm/gma500/blitter.c
new file mode 100644
index 0000000..7d72587
--- /dev/null
+++ b/drivers/gpu/drm/gma500/blitter.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2014, Patrik Jakobsson
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * Authors: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
+ */
+
+#include "psb_drv.h"
+
+#include "blitter.h"
+#include "psb_reg.h"
+
+/* Wait for the blitter to be completely idle */
+int gma_blt_wait_idle(struct drm_psb_private *dev_priv)
+{
+ unsigned long stop = jiffies + HZ;
+ int busy = 1;
+
+ /* First do a quick check */
+ if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
+ ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
+ return 0;
+
+ do {
+ busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
+ } while (busy && !time_after_eq(jiffies, stop));
+
+ if (busy)
+ return -EBUSY;
+
+ do {
+ busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
+ _PSB_C2B_STATUS_BUSY) != 0);
+ } while (busy && !time_after_eq(jiffies, stop));
+
+ /* If still busy, we probably have a hang */
+ return (busy) ? -EBUSY : 0;
+}
diff --git a/drivers/gpu/drm/gma500/blitter.h b/drivers/gpu/drm/gma500/blitter.h
new file mode 100644
index 0000000..b83648d
--- /dev/null
+++ b/drivers/gpu/drm/gma500/blitter.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2014, Patrik Jakobsson
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * Authors: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
+ */
+
+#ifndef __BLITTER_H
+#define __BLITTER_H
+
+extern int gma_blt_wait_idle(struct drm_psb_private *dev_priv);
+
+#endif
--
1.8.3.2
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