[media] v4l: s5p-tv: add TV Mixer driver for Samsung S5P platform

Add driver for TV Mixer on Samsung platforms from S5P family.
Mixer is responsible for merging images from three layers and
passing result to the output.

Drivers are using:
- v4l2 framework
- videobuf2
- runtime PM

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 541 insertions, 0 deletions

diff --git a/drivers/media/video/s5p-tv/mixer_reg.c b/drivers/media/video/s5p-tv/mixer_reg.c
new file mode 100644
index 00000000000..38dac672aa1
--- /dev/null
+++ b/drivers/media/video/s5p-tv/mixer_reg.c
@@ -0,0 +1,541 @@
+/*
+ * Samsung TV Mixer driver
+ *
+ * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
+ *
+ * Tomasz Stanislawski, <t.stanislaws@samsung.com>
+ *
+ * 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 Foundiation. either version 2 of the License,
+ * or (at your option) any later version
+ */
+
+#include "mixer.h"
+#include "regs-mixer.h"
+#include "regs-vp.h"
+
+#include <linux/delay.h>
+
+/* Register access subroutines */
+
+static inline u32 vp_read(struct mxr_device *mdev, u32 reg_id)
+{
+	return readl(mdev->res.vp_regs + reg_id);
+}
+
+static inline void vp_write(struct mxr_device *mdev, u32 reg_id, u32 val)
+{
+	writel(val, mdev->res.vp_regs + reg_id);
+}
+
+static inline void vp_write_mask(struct mxr_device *mdev, u32 reg_id,
+	u32 val, u32 mask)
+{
+	u32 old = vp_read(mdev, reg_id);
+
+	val = (val & mask) | (old & ~mask);
+	writel(val, mdev->res.vp_regs + reg_id);
+}
+
+static inline u32 mxr_read(struct mxr_device *mdev, u32 reg_id)
+{
+	return readl(mdev->res.mxr_regs + reg_id);
+}
+
+static inline void mxr_write(struct mxr_device *mdev, u32 reg_id, u32 val)
+{
+	writel(val, mdev->res.mxr_regs + reg_id);
+}
+
+static inline void mxr_write_mask(struct mxr_device *mdev, u32 reg_id,
+	u32 val, u32 mask)
+{
+	u32 old = mxr_read(mdev, reg_id);
+
+	val = (val & mask) | (old & ~mask);
+	writel(val, mdev->res.mxr_regs + reg_id);
+}
+
+void mxr_vsync_set_update(struct mxr_device *mdev, int en)
+{
+	/* block update on vsync */
+	mxr_write_mask(mdev, MXR_STATUS, en ? MXR_STATUS_SYNC_ENABLE : 0,
+		MXR_STATUS_SYNC_ENABLE);
+	vp_write(mdev, VP_SHADOW_UPDATE, en ? VP_SHADOW_UPDATE_ENABLE : 0);
+}
+
+static void __mxr_reg_vp_reset(struct mxr_device *mdev)
+{
+	int tries = 100;
+
+	vp_write(mdev, VP_SRESET, VP_SRESET_PROCESSING);
+	for (tries = 100; tries; --tries) {
+		/* waiting until VP_SRESET_PROCESSING is 0 */
+		if (~vp_read(mdev, VP_SRESET) & VP_SRESET_PROCESSING)
+			break;
+		mdelay(10);
+	}
+	WARN(tries == 0, "failed to reset Video Processor\n");
+}
+
+static void mxr_reg_vp_default_filter(struct mxr_device *mdev);
+
+void mxr_reg_reset(struct mxr_device *mdev)
+{
+	unsigned long flags;
+	u32 val; /* value stored to register */
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	/* set output in RGB888 mode */
+	mxr_write(mdev, MXR_CFG, MXR_CFG_OUT_YUV444);
+
+	/* 16 beat burst in DMA */
+	mxr_write_mask(mdev, MXR_STATUS, MXR_STATUS_16_BURST,
+		MXR_STATUS_BURST_MASK);
+
+	/* setting default layer priority: layer1 > video > layer0
+	 * because typical usage scenario would be
+	 * layer0 - framebuffer
+	 * video - video overlay
+	 * layer1 - OSD
+	 */
+	val  = MXR_LAYER_CFG_GRP0_VAL(1);
+	val |= MXR_LAYER_CFG_VP_VAL(2);
+	val |= MXR_LAYER_CFG_GRP1_VAL(3);
+	mxr_write(mdev, MXR_LAYER_CFG, val);
+
+	/* use dark gray background color */
+	mxr_write(mdev, MXR_BG_COLOR0, 0x808080);
+	mxr_write(mdev, MXR_BG_COLOR1, 0x808080);
+	mxr_write(mdev, MXR_BG_COLOR2, 0x808080);
+
+	/* setting graphical layers */
+
+	val  = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
+	val |= MXR_GRP_CFG_BLEND_PRE_MUL; /* premul mode */
+	val |= MXR_GRP_CFG_ALPHA_VAL(0xff); /* non-transparent alpha */
+
+	/* the same configuration for both layers */
+	mxr_write(mdev, MXR_GRAPHIC_CFG(0), val);
+	mxr_write(mdev, MXR_GRAPHIC_CFG(1), val);
+
+	/* configuration of Video Processor Registers */
+	__mxr_reg_vp_reset(mdev);
+	mxr_reg_vp_default_filter(mdev);
+
+	/* enable all interrupts */
+	mxr_write_mask(mdev, MXR_INT_EN, ~0, MXR_INT_EN_ALL);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+void mxr_reg_graph_format(struct mxr_device *mdev, int idx,
+	const struct mxr_format *fmt, const struct mxr_geometry *geo)
+{
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	/* setup format */
+	mxr_write_mask(mdev, MXR_GRAPHIC_CFG(idx),
+		MXR_GRP_CFG_FORMAT_VAL(fmt->cookie), MXR_GRP_CFG_FORMAT_MASK);
+
+	/* setup geometry */
+	mxr_write(mdev, MXR_GRAPHIC_SPAN(idx), geo->src.full_width);
+	val  = MXR_GRP_WH_WIDTH(geo->src.width);
+	val |= MXR_GRP_WH_HEIGHT(geo->src.height);
+	val |= MXR_GRP_WH_H_SCALE(geo->x_ratio);
+	val |= MXR_GRP_WH_V_SCALE(geo->y_ratio);
+	mxr_write(mdev, MXR_GRAPHIC_WH(idx), val);
+
+	/* setup offsets in source image */
+	val  = MXR_GRP_SXY_SX(geo->src.x_offset);
+	val |= MXR_GRP_SXY_SY(geo->src.y_offset);
+	mxr_write(mdev, MXR_GRAPHIC_SXY(idx), val);
+
+	/* setup offsets in display image */
+	val  = MXR_GRP_DXY_DX(geo->dst.x_offset);
+	val |= MXR_GRP_DXY_DY(geo->dst.y_offset);
+	mxr_write(mdev, MXR_GRAPHIC_DXY(idx), val);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+void mxr_reg_vp_format(struct mxr_device *mdev,
+	const struct mxr_format *fmt, const struct mxr_geometry *geo)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	vp_write_mask(mdev, VP_MODE, fmt->cookie, VP_MODE_FMT_MASK);
+
+	/* setting size of input image */
+	vp_write(mdev, VP_IMG_SIZE_Y, VP_IMG_HSIZE(geo->src.full_width) |
+		VP_IMG_VSIZE(geo->src.full_height));
+	/* chroma height has to reduced by 2 to avoid chroma distorions */
+	vp_write(mdev, VP_IMG_SIZE_C, VP_IMG_HSIZE(geo->src.full_width) |
+		VP_IMG_VSIZE(geo->src.full_height / 2));
+
+	vp_write(mdev, VP_SRC_WIDTH, geo->src.width);
+	vp_write(mdev, VP_SRC_HEIGHT, geo->src.height);
+	vp_write(mdev, VP_SRC_H_POSITION,
+		VP_SRC_H_POSITION_VAL(geo->src.x_offset));
+	vp_write(mdev, VP_SRC_V_POSITION, geo->src.y_offset);
+
+	vp_write(mdev, VP_DST_WIDTH, geo->dst.width);
+	vp_write(mdev, VP_DST_H_POSITION, geo->dst.x_offset);
+	if (geo->dst.field == V4L2_FIELD_INTERLACED) {
+		vp_write(mdev, VP_DST_HEIGHT, geo->dst.height / 2);
+		vp_write(mdev, VP_DST_V_POSITION, geo->dst.y_offset / 2);
+	} else {
+		vp_write(mdev, VP_DST_HEIGHT, geo->dst.height);
+		vp_write(mdev, VP_DST_V_POSITION, geo->dst.y_offset);
+	}
+
+	vp_write(mdev, VP_H_RATIO, geo->x_ratio);
+	vp_write(mdev, VP_V_RATIO, geo->y_ratio);
+
+	vp_write(mdev, VP_ENDIAN_MODE, VP_ENDIAN_MODE_LITTLE);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+
+}
+
+void mxr_reg_graph_buffer(struct mxr_device *mdev, int idx, dma_addr_t addr)
+{
+	u32 val = addr ? ~0 : 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	if (idx == 0)
+		mxr_write_mask(mdev, MXR_CFG, val, MXR_CFG_GRP0_ENABLE);
+	else
+		mxr_write_mask(mdev, MXR_CFG, val, MXR_CFG_GRP1_ENABLE);
+	mxr_write(mdev, MXR_GRAPHIC_BASE(idx), addr);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+void mxr_reg_vp_buffer(struct mxr_device *mdev,
+	dma_addr_t luma_addr[2], dma_addr_t chroma_addr[2])
+{
+	u32 val = luma_addr[0] ? ~0 : 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	mxr_write_mask(mdev, MXR_CFG, val, MXR_CFG_VP_ENABLE);
+	vp_write_mask(mdev, VP_ENABLE, val, VP_ENABLE_ON);
+	/* TODO: fix tiled mode */
+	vp_write(mdev, VP_TOP_Y_PTR, luma_addr[0]);
+	vp_write(mdev, VP_TOP_C_PTR, chroma_addr[0]);
+	vp_write(mdev, VP_BOT_Y_PTR, luma_addr[1]);
+	vp_write(mdev, VP_BOT_C_PTR, chroma_addr[1]);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+static void mxr_irq_layer_handle(struct mxr_layer *layer)
+{
+	struct list_head *head = &layer->enq_list;
+	struct mxr_buffer *done;
+
+	/* skip non-existing layer */
+	if (layer == NULL)
+		return;
+
+	spin_lock(&layer->enq_slock);
+	if (layer->state == MXR_LAYER_IDLE)
+		goto done;
+
+	done = layer->shadow_buf;
+	layer->shadow_buf = layer->update_buf;
+
+	if (list_empty(head)) {
+		if (layer->state != MXR_LAYER_STREAMING)
+			layer->update_buf = NULL;
+	} else {
+		struct mxr_buffer *next;
+		next = list_first_entry(head, struct mxr_buffer, list);
+		list_del(&next->list);
+		layer->update_buf = next;
+	}
+
+	layer->ops.buffer_set(layer, layer->update_buf);
+
+	if (done && done != layer->shadow_buf)
+		vb2_buffer_done(&done->vb, VB2_BUF_STATE_DONE);
+
+done:
+	spin_unlock(&layer->enq_slock);
+}
+
+irqreturn_t mxr_irq_handler(int irq, void *dev_data)
+{
+	struct mxr_device *mdev = dev_data;
+	u32 i, val;
+
+	spin_lock(&mdev->reg_slock);
+	val = mxr_read(mdev, MXR_INT_STATUS);
+
+	/* wake up process waiting for VSYNC */
+	if (val & MXR_INT_STATUS_VSYNC) {
+		set_bit(MXR_EVENT_VSYNC, &mdev->event_flags);
+		wake_up(&mdev->event_queue);
+	}
+
+	/* clear interrupts */
+	if (~val & MXR_INT_EN_VSYNC) {
+		/* vsync interrupt use different bit for read and clear */
+		val &= ~MXR_INT_EN_VSYNC;
+		val |= MXR_INT_CLEAR_VSYNC;
+	}
+	mxr_write(mdev, MXR_INT_STATUS, val);
+
+	spin_unlock(&mdev->reg_slock);
+	/* leave on non-vsync event */
+	if (~val & MXR_INT_CLEAR_VSYNC)
+		return IRQ_HANDLED;
+	for (i = 0; i < MXR_MAX_LAYERS; ++i)
+		mxr_irq_layer_handle(mdev->layer[i]);
+	return IRQ_HANDLED;
+}
+
+void mxr_reg_s_output(struct mxr_device *mdev, int cookie)
+{
+	u32 val;
+
+	val = cookie == 0 ? MXR_CFG_DST_SDO : MXR_CFG_DST_HDMI;
+	mxr_write_mask(mdev, MXR_CFG, val, MXR_CFG_DST_MASK);
+}
+
+void mxr_reg_streamon(struct mxr_device *mdev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	/* single write -> no need to block vsync update */
+
+	/* start MIXER */
+	mxr_write_mask(mdev, MXR_STATUS, ~0, MXR_STATUS_REG_RUN);
+
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+void mxr_reg_streamoff(struct mxr_device *mdev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	/* single write -> no need to block vsync update */
+
+	/* stop MIXER */
+	mxr_write_mask(mdev, MXR_STATUS, 0, MXR_STATUS_REG_RUN);
+
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+int mxr_reg_wait4vsync(struct mxr_device *mdev)
+{
+	int ret;
+
+	clear_bit(MXR_EVENT_VSYNC, &mdev->event_flags);
+	/* TODO: consider adding interruptible */
+	ret = wait_event_timeout(mdev->event_queue,
+		test_bit(MXR_EVENT_VSYNC, &mdev->event_flags),
+		msecs_to_jiffies(1000));
+	if (ret > 0)
+		return 0;
+	if (ret < 0)
+		return ret;
+	mxr_warn(mdev, "no vsync detected - timeout\n");
+	return -ETIME;
+}
+
+void mxr_reg_set_mbus_fmt(struct mxr_device *mdev,
+	struct v4l2_mbus_framefmt *fmt)
+{
+	u32 val = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mdev->reg_slock, flags);
+	mxr_vsync_set_update(mdev, MXR_DISABLE);
+
+	/* choosing between interlace and progressive mode */
+	if (fmt->field == V4L2_FIELD_INTERLACED)
+		val |= MXR_CFG_SCAN_INTERLACE;
+	else
+		val |= MXR_CFG_SCAN_PROGRASSIVE;
+
+	/* choosing between porper HD and SD mode */
+	if (fmt->height == 480)
+		val |= MXR_CFG_SCAN_NTSC | MXR_CFG_SCAN_SD;
+	else if (fmt->height == 576)
+		val |= MXR_CFG_SCAN_PAL | MXR_CFG_SCAN_SD;
+	else if (fmt->height == 720)
+		val |= MXR_CFG_SCAN_HD_720 | MXR_CFG_SCAN_HD;
+	else if (fmt->height == 1080)
+		val |= MXR_CFG_SCAN_HD_1080 | MXR_CFG_SCAN_HD;
+	else
+		WARN(1, "unrecognized mbus height %u!\n", fmt->height);
+
+	mxr_write_mask(mdev, MXR_CFG, val, MXR_CFG_SCAN_MASK);
+
+	val = (fmt->field == V4L2_FIELD_INTERLACED) ? ~0 : 0;
+	vp_write_mask(mdev, VP_MODE, val,
+		VP_MODE_LINE_SKIP | VP_MODE_FIELD_ID_AUTO_TOGGLING);
+
+	mxr_vsync_set_update(mdev, MXR_ENABLE);
+	spin_unlock_irqrestore(&mdev->reg_slock, flags);
+}
+
+void mxr_reg_graph_layer_stream(struct mxr_device *mdev, int idx, int en)
+{
+	/* no extra actions need to be done */
+}
+
+void mxr_reg_vp_layer_stream(struct mxr_device *mdev, int en)
+{
+	/* no extra actions need to be done */
+}
+
+static const u8 filter_y_horiz_tap8[] = {
+	0,	-1,	-1,	-1,	-1,	-1,	-1,	-1,
+	-1,	-1,	-1,	-1,	-1,	0,	0,	0,
+	0,	2,	4,	5,	6,	6,	6,	6,
+	6,	5,	5,	4,	3,	2,	1,	1,
+	0,	-6,	-12,	-16,	-18,	-20,	-21,	-20,
+	-20,	-18,	-16,	-13,	-10,	-8,	-5,	-2,
+	127,	126,	125,	121,	114,	107,	99,	89,
+	79,	68,	57,	46,	35,	25,	16,	8,
+};
+
+static const u8 filter_y_vert_tap4[] = {
+	0,	-3,	-6,	-8,	-8,	-8,	-8,	-7,
+	-6,	-5,	-4,	-3,	-2,	-1,	-1,	0,
+	127,	126,	124,	118,	111,	102,	92,	81,
+	70,	59,	48,	37,	27,	19,	11,	5,
+	0,	5,	11,	19,	27,	37,	48,	59,
+	70,	81,	92,	102,	111,	118,	124,	126,
+	0,	0,	-1,	-1,	-2,	-3,	-4,	-5,
+	-6,	-7,	-8,	-8,	-8,	-8,	-6,	-3,
+};
+
+static const u8 filter_cr_horiz_tap4[] = {
+	0,	-3,	-6,	-8,	-8,	-8,	-8,	-7,
+	-6,	-5,	-4,	-3,	-2,	-1,	-1,	0,
+	127,	126,	124,	118,	111,	102,	92,	81,
+	70,	59,	48,	37,	27,	19,	11,	5,
+};
+
+static inline void mxr_reg_vp_filter_set(struct mxr_device *mdev,
+	int reg_id, const u8 *data, unsigned int size)
+{
+	/* assure 4-byte align */
+	BUG_ON(size & 3);
+	for (; size; size -= 4, reg_id += 4, data += 4) {
+		u32 val = (data[0] << 24) |  (data[1] << 16) |
+			(data[2] << 8) | data[3];
+		vp_write(mdev, reg_id, val);
+	}
+}
+
+static void mxr_reg_vp_default_filter(struct mxr_device *mdev)
+{
+	mxr_reg_vp_filter_set(mdev, VP_POLY8_Y0_LL,
+		filter_y_horiz_tap8, sizeof filter_y_horiz_tap8);
+	mxr_reg_vp_filter_set(mdev, VP_POLY4_Y0_LL,
+		filter_y_vert_tap4, sizeof filter_y_vert_tap4);
+	mxr_reg_vp_filter_set(mdev, VP_POLY4_C0_LL,
+		filter_cr_horiz_tap4, sizeof filter_cr_horiz_tap4);
+}
+
+static void mxr_reg_mxr_dump(struct mxr_device *mdev)
+{
+#define DUMPREG(reg_id) \
+do { \
+	mxr_dbg(mdev, #reg_id " = %08x\n", \
+		(u32)readl(mdev->res.mxr_regs + reg_id)); \
+} while (0)
+
+	DUMPREG(MXR_STATUS);
+	DUMPREG(MXR_CFG);
+	DUMPREG(MXR_INT_EN);
+	DUMPREG(MXR_INT_STATUS);
+
+	DUMPREG(MXR_LAYER_CFG);
+	DUMPREG(MXR_VIDEO_CFG);
+
+	DUMPREG(MXR_GRAPHIC0_CFG);
+	DUMPREG(MXR_GRAPHIC0_BASE);
+	DUMPREG(MXR_GRAPHIC0_SPAN);
+	DUMPREG(MXR_GRAPHIC0_WH);
+	DUMPREG(MXR_GRAPHIC0_SXY);
+	DUMPREG(MXR_GRAPHIC0_DXY);
+
+	DUMPREG(MXR_GRAPHIC1_CFG);
+	DUMPREG(MXR_GRAPHIC1_BASE);
+	DUMPREG(MXR_GRAPHIC1_SPAN);
+	DUMPREG(MXR_GRAPHIC1_WH);
+	DUMPREG(MXR_GRAPHIC1_SXY);
+	DUMPREG(MXR_GRAPHIC1_DXY);
+#undef DUMPREG
+}
+
+static void mxr_reg_vp_dump(struct mxr_device *mdev)
+{
+#define DUMPREG(reg_id) \
+do { \
+	mxr_dbg(mdev, #reg_id " = %08x\n", \
+		(u32) readl(mdev->res.vp_regs + reg_id)); \
+} while (0)
+
+
+	DUMPREG(VP_ENABLE);
+	DUMPREG(VP_SRESET);
+	DUMPREG(VP_SHADOW_UPDATE);
+	DUMPREG(VP_FIELD_ID);
+	DUMPREG(VP_MODE);
+	DUMPREG(VP_IMG_SIZE_Y);
+	DUMPREG(VP_IMG_SIZE_C);
+	DUMPREG(VP_PER_RATE_CTRL);
+	DUMPREG(VP_TOP_Y_PTR);
+	DUMPREG(VP_BOT_Y_PTR);
+	DUMPREG(VP_TOP_C_PTR);
+	DUMPREG(VP_BOT_C_PTR);
+	DUMPREG(VP_ENDIAN_MODE);
+	DUMPREG(VP_SRC_H_POSITION);
+	DUMPREG(VP_SRC_V_POSITION);
+	DUMPREG(VP_SRC_WIDTH);
+	DUMPREG(VP_SRC_HEIGHT);
+	DUMPREG(VP_DST_H_POSITION);
+	DUMPREG(VP_DST_V_POSITION);
+	DUMPREG(VP_DST_WIDTH);
+	DUMPREG(VP_DST_HEIGHT);
+	DUMPREG(VP_H_RATIO);
+	DUMPREG(VP_V_RATIO);
+
+#undef DUMPREG
+}
+
+void mxr_reg_dump(struct mxr_device *mdev)
+{
+	mxr_reg_mxr_dump(mdev);
+	mxr_reg_vp_dump(mdev);
+}
+