Mixer hardware IP is responsible of mixing the different inputs layers.
Z-order is managed by the mixer.
We could 2 mixers: one for main path and one for auxillary path
Mixers are part of Compositor hardware block
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
---
drivers/gpu/drm/sti/Makefile | 1 +
drivers/gpu/drm/sti/sti_mixer.c | 243 ++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/sti/sti_mixer.h | 54 +++++++++
3 files changed, 298 insertions(+)
create mode 100644 drivers/gpu/drm/sti/sti_mixer.c
create mode 100644 drivers/gpu/drm/sti/sti_mixer.h
diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile
index bb0f6b3..ce03e15 100644
--- a/drivers/gpu/drm/sti/Makefile
+++ b/drivers/gpu/drm/sti/Makefile
@@ -6,5 +6,6 @@ obj-$(CONFIG_DRM_STI) += \
sti_hdmi_tx3g4c28phy.o \
sti_hda.o \
sti_tvout.o \
+ sti_mixer.o \
sti_gdp.o \
sti_vid.o
\ No newline at end of file
diff --git a/drivers/gpu/drm/sti/sti_mixer.c b/drivers/gpu/drm/sti/sti_mixer.c
new file mode 100644
index 0000000..5fa6dc5
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_mixer.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Authors: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
+ * Fabien Dessenne <fabien.dessenne@xxxxxx>
+ * for STMicroelectronics.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include "sti_mixer.h"
+#include "sti_vtg.h"
+
+/* Identity: G=Y , B=Cb , R=Cr */
+static const u32 mixerColorSpaceMatIdentity[] = {
+ 0x10000000, 0x00000000, 0x10000000, 0x00001000,
+ 0x00000000, 0x00000000, 0x00000000, 0x00000000
+};
+
+/* regs offset */
+#define GAM_MIXER_CTL 0x00
+#define GAM_MIXER_BKC 0x04
+#define GAM_MIXER_BCO 0x0C
+#define GAM_MIXER_BCS 0x10
+#define GAM_MIXER_AVO 0x28
+#define GAM_MIXER_AVS 0x2C
+#define GAM_MIXER_CRB 0x34
+#define GAM_MIXER_ACT 0x38
+#define GAM_MIXER_MBP 0x3C
+#define GAM_MIXER_MX0 0x80
+
+/* id for depth of CRB reg */
+#define GAM_DEPTH_VID0_ID 1
+#define GAM_DEPTH_VID1_ID 2
+#define GAM_DEPTH_GDP0_ID 3
+#define GAM_DEPTH_GDP1_ID 4
+#define GAM_DEPTH_GDP2_ID 5
+#define GAM_DEPTH_GDP3_ID 6
+#define GAM_DEPTH_MASK_ID 7
+
+/* mask in CTL reg */
+#define GAM_CTL_BACK_MASK BIT(0)
+#define GAM_CTL_VID0_MASK BIT(1)
+#define GAM_CTL_VID1_MASK BIT(2)
+#define GAM_CTL_GDP0_MASK BIT(3)
+#define GAM_CTL_GDP1_MASK BIT(4)
+#define GAM_CTL_GDP2_MASK BIT(5)
+#define GAM_CTL_GDP3_MASK BIT(6)
+
+const char *sti_mixer_to_str(struct sti_mixer *mixer)
+{
+ switch (mixer->id) {
+ case STI_MIXER_MAIN:
+ return "MAIN_MIXER";
+ case STI_MIXER_AUX:
+ return "AUX_MIXER";
+ default:
+ return "<UNKNOWN MIXER>";
+ }
+}
+
+static inline u32 sti_mixer_reg_read(struct sti_mixer *mixer, u32 reg_id)
+{
+ return readl(mixer->regs + reg_id);
+}
+
+static inline void sti_mixer_reg_write(struct sti_mixer *mixer,
+ u32 reg_id, u32 val)
+{
+ writel(val, mixer->regs + reg_id);
+}
+
+void sti_mixer_set_background_status(struct sti_mixer *mixer, bool enable)
+{
+ u32 val = sti_mixer_reg_read(mixer, GAM_MIXER_CTL);
+
+ val &= ~GAM_CTL_BACK_MASK;
+ val |= enable;
+ sti_mixer_reg_write(mixer, GAM_MIXER_CTL, val);
+}
+
+static void sti_mixer_set_background_color(struct sti_mixer *mixer,
+ u8 red, u8 green, u8 blue)
+{
+ u32 val = (red << 16) | (green << 8) | blue;
+
+ sti_mixer_reg_write(mixer, GAM_MIXER_BKC, val);
+}
+
+static void sti_mixer_set_background_area(struct sti_mixer *mixer,
+ struct drm_display_mode *mode)
+{
+ u32 ydo, xdo, yds, xds;
+
+ ydo = sti_vtg_get_line_number(*mode, 0);
+ yds = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
+ xdo = sti_vtg_get_pixel_number(*mode, 0);
+ xds = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
+
+ sti_mixer_reg_write(mixer, GAM_MIXER_BCO, ydo << 16 | xdo);
+ sti_mixer_reg_write(mixer, GAM_MIXER_BCS, yds << 16 | xds);
+}
+
+int sti_mixer_set_layer_depth(struct sti_mixer *mixer, struct sti_layer *layer)
+{
+ int layer_id = 0, depth = layer->zorder;
+ u32 mask, val;
+
+ if (depth >= GAM_MIXER_NB_DEPTH_LEVEL)
+ return 1;
+
+ switch (layer->desc) {
+ case STI_GDP_0:
+ layer_id = GAM_DEPTH_GDP0_ID;
+ break;
+ case STI_GDP_1:
+ layer_id = GAM_DEPTH_GDP1_ID;
+ break;
+ case STI_GDP_2:
+ layer_id = GAM_DEPTH_GDP2_ID;
+ break;
+ case STI_GDP_3:
+ layer_id = GAM_DEPTH_GDP3_ID;
+ break;
+ case STI_VID_0:
+ layer_id = GAM_DEPTH_VID0_ID;
+ break;
+ case STI_VID_1:
+ layer_id = GAM_DEPTH_VID1_ID;
+ break;
+ default:
+ DRM_ERROR("Unknown layer %d\n", layer->desc);
+ return 1;
+ }
+ mask = GAM_DEPTH_MASK_ID << (3 * depth);
+ layer_id = layer_id << (3 * depth);
+
+ dev_dbg(mixer->dev, "GAM_MIXER_CRB val 0x%x mask 0x%x\n",
+ layer_id, mask);
+
+ val = sti_mixer_reg_read(mixer, GAM_MIXER_CRB);
+ val &= ~mask;
+ val |= layer_id;
+ sti_mixer_reg_write(mixer, GAM_MIXER_CRB, val);
+
+ dev_dbg(mixer->dev, "Read GAM_MIXER_CRB 0x%x\n",
+ sti_mixer_reg_read(mixer, GAM_MIXER_CRB));
+ return 0;
+}
+
+int sti_mixer_active_video_area(struct sti_mixer *mixer,
+ struct drm_display_mode *mode)
+{
+ u32 ydo, xdo, yds, xds;
+
+ ydo = sti_vtg_get_line_number(*mode, 0);
+ yds = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
+ xdo = sti_vtg_get_pixel_number(*mode, 0);
+ xds = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
+
+ DRM_DEBUG_DRIVER("%s active video area xdo:%d ydo:%d xds:%d yds:%d\n",
+ sti_mixer_to_str(mixer), xdo, ydo, xds, yds);
+ sti_mixer_reg_write(mixer, GAM_MIXER_AVO, ydo << 16 | xdo);
+ sti_mixer_reg_write(mixer, GAM_MIXER_AVS, yds << 16 | xds);
+
+ sti_mixer_set_background_color(mixer, 0xFF, 0, 0);
+
+ sti_mixer_set_background_area(mixer, mode);
+ sti_mixer_set_background_status(mixer, true);
+ return 0;
+}
+
+static u32 sti_mixer_get_layer_mask(struct sti_layer *layer)
+{
+ switch (layer->desc) {
+ case STI_BACK:
+ return GAM_CTL_BACK_MASK;
+ case STI_GDP_0:
+ return GAM_CTL_GDP0_MASK;
+ case STI_GDP_1:
+ return GAM_CTL_GDP1_MASK;
+ case STI_GDP_2:
+ return GAM_CTL_GDP2_MASK;
+ case STI_GDP_3:
+ return GAM_CTL_GDP3_MASK;
+ case STI_VID_0:
+ return GAM_CTL_VID0_MASK;
+ case STI_VID_1:
+ return GAM_CTL_VID1_MASK;
+ default:
+ return 0;
+ }
+}
+
+int sti_mixer_set_layer_status(struct sti_mixer *mixer,
+ struct sti_layer *layer, bool status)
+{
+ u32 mask, val;
+
+ mask = sti_mixer_get_layer_mask(layer);
+ if (!mask) {
+ DRM_ERROR("Can not find layer mask\n");
+ return -EINVAL;
+ }
+
+ val = sti_mixer_reg_read(mixer, GAM_MIXER_CTL);
+ val &= ~mask;
+ val |= status ? mask : 0;
+ sti_mixer_reg_write(mixer, GAM_MIXER_CTL, val);
+
+ return 0;
+}
+
+void sti_mixer_set_matrix(struct sti_mixer *mixer)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(mixerColorSpaceMatIdentity); i++)
+ sti_mixer_reg_write(mixer, GAM_MIXER_MX0 + (i * 4),
+ mixerColorSpaceMatIdentity[i]);
+}
+
+struct sti_mixer *sti_mixer_create(struct device *dev, int id,
+ void __iomem *baseaddr)
+{
+ struct sti_mixer *mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
+ struct device_node *np = dev->of_node;
+
+ dev_dbg(dev, "%s\n", __func__);
+ if (!mixer) {
+ DRM_ERROR("Failed to allocated memory for mixer\n");
+ return NULL;
+ }
+ mixer->regs = baseaddr;
+ mixer->dev = dev;
+ mixer->id = id;
+
+ if (of_device_is_compatible(np, "st,stih416-compositor"))
+ sti_mixer_set_matrix(mixer);
+
+ DRM_DEBUG_DRIVER("%s created. Regs=%p\n",
+ sti_mixer_to_str(mixer), mixer->regs);
+
+ return mixer;
+}
diff --git a/drivers/gpu/drm/sti/sti_mixer.h b/drivers/gpu/drm/sti/sti_mixer.h
new file mode 100644
index 0000000..8743721
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_mixer.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Authors: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
+ * Fabien Dessenne <fabien.dessenne@xxxxxx>
+ * for STMicroelectronics.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#ifndef _STI_MIXER_H_
+#define _STI_MIXER_H_
+
+#include <drm/drmP.h>
+
+#include "sti_layer.h"
+
+#define to_sti_mixer(x) container_of(x, struct sti_mixer, drm_crtc)
+
+/**
+ * STI Mixer subdevice structure
+ *
+ * @dev: driver device
+ * @regs: mixer registers
+ * @id: id of the mixer
+ * @drm_crtc: crtc object link to the mixer
+ * @pending_event: set if a flip event is pending on crtc
+ */
+struct sti_mixer {
+ struct device *dev;
+ void __iomem *regs;
+ int id;
+ struct drm_crtc drm_crtc;
+ struct drm_pending_vblank_event *pending_event;
+};
+
+const char *sti_mixer_to_str(struct sti_mixer *mixer);
+
+struct sti_mixer *sti_mixer_create(struct device *dev, int id,
+ void __iomem *baseaddr);
+
+int sti_mixer_set_layer_status(struct sti_mixer *mixer,
+ struct sti_layer *layer, bool status);
+int sti_mixer_set_layer_depth(struct sti_mixer *mixer, struct sti_layer *layer);
+int sti_mixer_active_video_area(struct sti_mixer *mixer,
+ struct drm_display_mode *mode);
+
+void sti_mixer_set_background_status(struct sti_mixer *mixer, bool enable);
+
+/* depth in Cross-bar control = z order */
+#define GAM_MIXER_NB_DEPTH_LEVEL 7
+
+#define STI_MIXER_MAIN 0
+#define STI_MIXER_AUX 1
+
+#endif
--
1.9.1
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