1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/gpu/drm/meson/meson_canvas.c b/drivers/gpu/drm/meson/meson_canvas.c
new file mode 100644
index 000000000000..4109e36c297f
--- /dev/null
+++ b/drivers/gpu/drm/meson/meson_canvas.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2016 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
+ * Copyright (C) 2014 Endless Mobile
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "meson_drv.h"
+#include "meson_canvas.h"
+#include "meson_registers.h"
+
+/*
+ * CANVAS is a memory zone where physical memory frames information
+ * are stored for the VIU to scanout.
+ */
+
+/* DMC Registers */
+#define DMC_CAV_LUT_DATAL       0x48 /* 0x12 offset in data sheet */
+#define CANVAS_WIDTH_LBIT       29
+#define CANVAS_WIDTH_LWID       3
+#define DMC_CAV_LUT_DATAH       0x4c /* 0x13 offset in data sheet */
+#define CANVAS_WIDTH_HBIT       0
+#define CANVAS_HEIGHT_BIT       9
+#define CANVAS_BLKMODE_BIT      24
+#define DMC_CAV_LUT_ADDR        0x50 /* 0x14 offset in data sheet */
+#define CANVAS_LUT_WR_EN        (0x2 << 8)
+#define CANVAS_LUT_RD_EN        (0x1 << 8)
+
+void meson_canvas_setup(struct meson_drm *priv,
+                        uint32_t canvas_index, uint32_t addr,
+                        uint32_t stride, uint32_t height,
+                        unsigned int wrap,
+                        unsigned int blkmode)
+{
+        unsigned int val;
+
+        regmap_write(priv->dmc, DMC_CAV_LUT_DATAL,
+                (((addr + 7) >> 3)) |
+                (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
+
+        regmap_write(priv->dmc, DMC_CAV_LUT_DATAH,
+                ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
+                                                CANVAS_WIDTH_HBIT) |
+                (height << CANVAS_HEIGHT_BIT) |
+                (wrap << 22) |
+                (blkmode << CANVAS_BLKMODE_BIT));
+
+        regmap_write(priv->dmc, DMC_CAV_LUT_ADDR,
+                        CANVAS_LUT_WR_EN | canvas_index);
+
+        /* Force a read-back to make sure everything is flushed. */
+        regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val);
+}