drm: sti: add VID layer

VIDeo plug are one of the compositor input sub-devices.
VID are dedicated to video inputs like YUV plans.

Like GDP, VID are part of Compositor hardware block
and use sti_layer structure to provide an abstraction for
Compositor calls.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>

3 files changed, 152 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile
index 7de757f7eb38..9b613d24877f 100644
--- a/drivers/gpu/drm/sti/Makefile
+++ b/drivers/gpu/drm/sti/Makefile
@@ -1,5 +1,6 @@
 sticompositor-y := \
-        sti_gdp.o
+        sti_gdp.o \
+        sti_vid.o
 
 stihdmi-y := sti_hdmi.o \
         sti_hdmi_tx3g0c55phy.o \
diff --git a/drivers/gpu/drm/sti/sti_vid.c b/drivers/gpu/drm/sti/sti_vid.c
new file mode 100644
index 000000000000..10ced6a479f4
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_vid.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Author: Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <drm/drmP.h>
+
+#include "sti_layer.h"
+#include "sti_vid.h"
+#include "sti_vtg.h"
+
+/* Registers */
+#define VID_CTL                 0x00
+#define VID_ALP                 0x04
+#define VID_CLF                 0x08
+#define VID_VPO                 0x0C
+#define VID_VPS                 0x10
+#define VID_KEY1                0x28
+#define VID_KEY2                0x2C
+#define VID_MPR0                0x30
+#define VID_MPR1                0x34
+#define VID_MPR2                0x38
+#define VID_MPR3                0x3C
+#define VID_MST                 0x68
+#define VID_BC                  0x70
+#define VID_TINT                0x74
+#define VID_CSAT                0x78
+
+/* Registers values */
+#define VID_CTL_IGNORE          (BIT(31) | BIT(30))
+#define VID_CTL_PSI_ENABLE      (BIT(2) | BIT(1) | BIT(0))
+#define VID_ALP_OPAQUE          0x00000080
+#define VID_BC_DFLT             0x00008000
+#define VID_TINT_DFLT           0x00000000
+#define VID_CSAT_DFLT           0x00000080
+/* YCbCr to RGB BT709:
+ * R = Y+1.5391Cr
+ * G = Y-0.4590Cr-0.1826Cb
+ * B = Y+1.8125Cb */
+#define VID_MPR0_BT709          0x0A800000
+#define VID_MPR1_BT709          0x0AC50000
+#define VID_MPR2_BT709          0x07150545
+#define VID_MPR3_BT709          0x00000AE8
+
+static int sti_vid_prepare_layer(struct sti_layer *vid, bool first_prepare)
+{
+        u32 val;
+
+        /* Unmask */
+        val = readl(vid->regs + VID_CTL);
+        val &= ~VID_CTL_IGNORE;
+        writel(val, vid->regs + VID_CTL);
+
+        return 0;
+}
+
+static int sti_vid_commit_layer(struct sti_layer *vid)
+{
+        struct drm_display_mode *mode = vid->mode;
+        u32 ydo, xdo, yds, xds;
+
+        ydo = sti_vtg_get_line_number(*mode, vid->dst_y);
+        yds = sti_vtg_get_line_number(*mode, vid->dst_y + vid->dst_h - 1);
+        xdo = sti_vtg_get_pixel_number(*mode, vid->dst_x);
+        xds = sti_vtg_get_pixel_number(*mode, vid->dst_x + vid->dst_w - 1);
+
+        writel((ydo << 16) | xdo, vid->regs + VID_VPO);
+        writel((yds << 16) | xds, vid->regs + VID_VPS);
+
+        return 0;
+}
+
+static int sti_vid_disable_layer(struct sti_layer *vid)
+{
+        u32 val;
+
+        /* Mask */
+        val = readl(vid->regs + VID_CTL);
+        val |= VID_CTL_IGNORE;
+        writel(val, vid->regs + VID_CTL);
+
+        return 0;
+}
+
+static const uint32_t *sti_vid_get_formats(struct sti_layer *layer)
+{
+        return NULL;
+}
+
+static unsigned int sti_vid_get_nb_formats(struct sti_layer *layer)
+{
+        return 0;
+}
+
+static void sti_vid_init(struct sti_layer *vid)
+{
+        /* Enable PSI, Mask layer */
+        writel(VID_CTL_PSI_ENABLE | VID_CTL_IGNORE, vid->regs + VID_CTL);
+
+        /* Opaque */
+        writel(VID_ALP_OPAQUE, vid->regs + VID_ALP);
+
+        /* Color conversion parameters */
+        writel(VID_MPR0_BT709, vid->regs + VID_MPR0);
+        writel(VID_MPR1_BT709, vid->regs + VID_MPR1);
+        writel(VID_MPR2_BT709, vid->regs + VID_MPR2);
+        writel(VID_MPR3_BT709, vid->regs + VID_MPR3);
+
+        /* Brightness, contrast, tint, saturation */
+        writel(VID_BC_DFLT, vid->regs + VID_BC);
+        writel(VID_TINT_DFLT, vid->regs + VID_TINT);
+        writel(VID_CSAT_DFLT, vid->regs + VID_CSAT);
+}
+
+static const struct sti_layer_funcs vid_ops = {
+        .get_formats = sti_vid_get_formats,
+        .get_nb_formats = sti_vid_get_nb_formats,
+        .init = sti_vid_init,
+        .prepare = sti_vid_prepare_layer,
+        .commit = sti_vid_commit_layer,
+        .disable = sti_vid_disable_layer,
+};
+
+struct sti_layer *sti_vid_create(struct device *dev)
+{
+        struct sti_layer *vid;
+
+        vid = devm_kzalloc(dev, sizeof(*vid), GFP_KERNEL);
+        if (!vid) {
+                DRM_ERROR("Failed to allocate memory for VID\n");
+                return NULL;
+        }
+
+        vid->ops = &vid_ops;
+
+        return vid;
+}
diff --git a/drivers/gpu/drm/sti/sti_vid.h b/drivers/gpu/drm/sti/sti_vid.h
new file mode 100644
index 000000000000..2c0aecd63294
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_vid.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Author: Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _STI_VID_H_
+#define _STI_VID_H_
+
+struct sti_layer *sti_vid_create(struct device *dev);
+
+#endif