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From: YT Shen <yt.shen@mediatek.com>
To: <dri-devel@lists.freedesktop.org>, Philipp Zabel <p.zabel@pengutronix.de>
Subject: [PATCH v6 07/10] drm/mediatek: add dsi transfer function
Date: Thu, 4 Aug 2016 19:07:21 +0800
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Cc: Mark Rutland <mark.rutland@arm.com>, David Airlie <airlied@linux.ie>,
	thierry.reding@gmail.com, Russell King <linux@arm.linux.org.uk>,
	Mao Huang <littlecvr@chromium.org>,
	Bibby Hsieh <bibby.hsieh@mediatek.com>,
	YT Shen <yt.shen@mediatek.com>, yingjoe.chen@mediatek.com,
	devicetree@vger.kernel.org, Pawel Moll <pawel.moll@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	CK Hu <ck.hu@mediatek.com>,
	Rob Herring <robh+dt@kernel.org>, linux-mediatek@lists.infradead.org,
	Matthias Brugger <matthias.bgg@gmail.com>,
	shaoming chen <shaoming.chen@mediatek.com>,
	linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com,
	emil.l.velikov@gmail.com, linux-kernel@vger.kernel.org,
	Sascha Hauer <kernel@pengutronix.de>, Kumar Gala <galak@codeaurora.org>
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From: shaoming chen <shaoming.chen@mediatek.com>

add dsi read/write commands for transfer function

Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c |  261 ++++++++++++++++++++++++++++++++++++
 1 file changed, 261 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index eea6192..4541f59 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -24,6 +24,7 @@
 #include <linux/of_graph.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <video/mipi_display.h>
 #include <video/videomode.h>
 
 #include "mtk_drm_ddp_comp.h"
@@ -81,8 +82,16 @@
 #define DSI_HBP_WC		0x54
 #define DSI_HFP_WC		0x58
 
+#define DSI_CMDQ_SIZE		0x60
+#define CMDQ_SIZE		0x3f
+
 #define DSI_HSTX_CKL_WC		0x64
 
+#define DSI_RX_DATA0		0x74
+#define DSI_RX_DATA1		0x78
+#define DSI_RX_DATA2		0x7c
+#define DSI_RX_DATA3		0x80
+
 #define DSI_RACK		0x84
 #define RACK				BIT(0)
 
@@ -118,8 +127,25 @@
 #define CLK_HS_POST			(0xff << 8)
 #define CLK_HS_EXIT			(0xff << 16)
 
+#define DSI_CMDQ0		0x180
+
 #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
 
+#define MTK_DSI_HOST_IS_READ(type) \
+	((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \
+	(type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \
+	(type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
+	(type == MIPI_DSI_DCS_READ))
+
+#define MTK_DSI_HOST_IS_WRITE(type) \
+	((type == MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM) || \
+	(type == MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM) || \
+	(type == MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM) || \
+	(type == MIPI_DSI_DCS_SHORT_WRITE) || \
+	(type == MIPI_DSI_DCS_SHORT_WRITE_PARAM) || \
+	(type == MIPI_DSI_GENERIC_LONG_WRITE) || \
+	(type == MIPI_DSI_DCS_LONG_WRITE))
+
 struct phy;
 
 struct mtk_dsi {
@@ -149,6 +175,13 @@ struct mtk_dsi {
 	int irq_data;
 };
 
+struct dsi_rxtx_data {
+	u8 byte0;
+	u8 byte1;
+	u8 byte2;
+	u8 byte3;
+};
+
 static wait_queue_head_t _dsi_irq_wait_queue;
 
 static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
@@ -799,9 +832,237 @@ static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
 	return 0;
 }
 
+static void mtk_dsi_wait_for_idle(struct mtk_dsi *dsi)
+{
+	u32 timeout_ms = 500000; /* total 1s ~ 2s timeout */
+
+	while (timeout_ms--) {
+		if (!(readl(dsi->regs + DSI_INTSTA) & DSI_BUSY))
+			break;
+
+		usleep_range(2, 4);
+	}
+
+	if (timeout_ms == 0) {
+		dev_info(dsi->dev, "polling dsi wait not busy timeout!\n");
+
+		mtk_dsi_enable(dsi);
+		mtk_dsi_reset_engine(dsi);
+	}
+}
+
+static void mtk_dsi_wait_for_cmd_done(struct mtk_dsi *dsi)
+{
+	s32 ret = 0;
+	unsigned long timeout = msecs_to_jiffies(500);
+
+	dsi->irq_data &= ~CMD_DONE_INT_FLAG;
+
+	ret = wait_event_interruptible_timeout(_dsi_irq_wait_queue,
+			dsi->irq_data & CMD_DONE_INT_FLAG, timeout);
+	if (ret == 0) {
+		dev_info(dsi->dev, "dsi wait engine cmd done fail\n");
+
+		mtk_dsi_enable(dsi);
+		mtk_dsi_reset_engine(dsi);
+	}
+}
+
+static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
+{
+	const char *tx_buf = msg->tx_buf;
+	u32 reg_val, i;
+	u16 wc16;
+	u8 config, data0, data1, type;
+
+	if (MTK_DSI_HOST_IS_READ(type)) {
+		config = 4;
+		data0 = tx_buf[0];
+
+		if (msg->rx_len < 3)
+			type = MIPI_DSI_DCS_READ;
+		else
+			type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
+
+		data1 = 0;
+		reg_val = (data1 << 24) | (data0 << 16) | (type << 8) | config;
+
+		writel(reg_val, dsi->regs + DSI_CMDQ0);
+		mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, 1);
+	} else if (msg->tx_len > 2) {	/* send long packet */
+		config = 2;
+		type = msg->type;
+		wc16 = msg->tx_len;
+
+		reg_val = (wc16 << 16) | (type << 8) | config;
+
+		writel(reg_val, dsi->regs + DSI_CMDQ0);
+
+		for (i = 0; i < msg->tx_len; i++)
+			writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + 4 + i);
+
+		mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE,
+			     1 + (msg->tx_len + 3) / 4);
+	} else {	/* send short packet */
+		config = 0;
+		data0 = tx_buf[0];
+
+		if (msg->tx_len == 2) {
+			type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
+			data1 = tx_buf[1];
+		} else {
+			type = MIPI_DSI_DCS_SHORT_WRITE;
+			data1 = 0;
+		}
+
+		reg_val = (data1 << 24) | (data0 << 16) | (type << 8) | config;
+
+		writel(reg_val, dsi->regs + DSI_CMDQ0);
+		mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, 1);
+	}
+}
+
+static ssize_t mtk_dsi_host_read_cmd(struct mtk_dsi *dsi,
+				     const struct mipi_dsi_msg *msg)
+{
+	u8 max_try_count = 5;
+	u32 recv_cnt;
+	struct dsi_rxtx_data read_data[4];
+	s32 ret;
+	unsigned long timeout = msecs_to_jiffies(2000);
+
+	u8 *buffer = msg->rx_buf;
+	u8 buffer_size = msg->rx_len;
+	u8 type;
+
+	if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) {
+		dev_info(dsi->dev, "dsi engine is not command mode\n");
+		return -1;
+	}
+
+	if (!buffer) {
+		dev_info(dsi->dev, "dsi receive buffer size may be NULL\n");
+		return -1;
+	}
+
+	do {
+		if (max_try_count == 0) {
+			dev_info(dsi->dev, "dsi engine read counter has been maxinum\n");
+			return -1;
+		}
+
+		max_try_count--;
+		recv_cnt = 0;
+
+		mtk_dsi_wait_for_idle(dsi);
+		mtk_dsi_cmdq(dsi, msg);
+
+		dsi->irq_data &= ~LPRX_RD_RDY_INT_FLAG;
+
+		mtk_dsi_start(dsi);
+
+		/* 2s timeout*/
+		ret = wait_event_interruptible_timeout(_dsi_irq_wait_queue,
+				dsi->irq_data & LPRX_RD_RDY_INT_FLAG, timeout);
+		if (ret == 0) {
+			dev_info(dsi->dev, "Wait DSI read ready timeout!!!\n");
+
+			mtk_dsi_enable(dsi);
+			mtk_dsi_reset_engine(dsi);
+
+			return ret;
+		}
+
+		*(u32 *)(&read_data[0]) = readl(dsi->regs + DSI_RX_DATA0);
+		*(u32 *)(&read_data[1]) = readl(dsi->regs + DSI_RX_DATA1);
+		*(u32 *)(&read_data[2]) = readl(dsi->regs + DSI_RX_DATA2);
+		*(u32 *)(&read_data[3]) = readl(dsi->regs + DSI_RX_DATA3);
+
+		type = read_data[0].byte0;
+
+		if (type == MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE ||
+		    type == MIPI_DSI_RX_DCS_LONG_READ_RESPONSE) {
+			/*
+			 * Data ID(1 byte) + Word Count(2 bytes) + ECC(1 byte) +
+			 * data 0 + ...+ data WC-1 + CHECKSUM (2 bytes)
+			 */
+			recv_cnt = read_data[0].byte1 + read_data[0].byte2 * 16;
+			dev_info(dsi->dev, "long packet size: %d\n", recv_cnt);
+
+			/*
+			 * the buffer size is 16 bytes once, so the data payload
+			 * is, 16 - bytes(data ID + WC + ECC + CHECKSUM), if
+			 * over 10 bytes, it will be read again
+			 */
+			if (recv_cnt > 10)
+				recv_cnt = 10;
+
+			if (recv_cnt > buffer_size)
+				recv_cnt = buffer_size;
+
+			memcpy(buffer, &read_data[1], recv_cnt);
+		} else if (type == MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE ||
+			   type == MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE ||
+			   type == MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE ||
+			   type == MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE) {
+			if (type == MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE ||
+			    type == MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE)
+				recv_cnt = 1;
+			else
+				recv_cnt = 2;
+
+			if (recv_cnt > buffer_size)
+				recv_cnt = buffer_size;
+
+			memcpy(buffer, &read_data[0].byte1, recv_cnt);
+		} else if (type == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT) {
+			dev_info(dsi->dev, "packet type is 0x02, try again\n");
+		} else {
+			dev_info(dsi->dev, "packet type(0x%x) cannot be non-recognize\n",
+				 type);
+
+			return 0;
+		}
+	} while (type == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT);
+
+	dev_info(dsi->dev, "dsi get %d byte data from the panel address(0x%x)\n",
+		 recv_cnt, *((u8 *)(msg->tx_buf)));
+
+	return recv_cnt;
+}
+
+static ssize_t mtk_dsi_host_write_cmd(struct mtk_dsi *dsi,
+				      const struct mipi_dsi_msg *msg)
+{
+	mtk_dsi_wait_for_idle(dsi);
+
+	mtk_dsi_cmdq(dsi, msg);
+
+	mtk_dsi_start(dsi);
+	mtk_dsi_wait_for_cmd_done(dsi);
+
+	return 0;
+}
+
+static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
+				     const struct mipi_dsi_msg *msg)
+{
+	struct mtk_dsi *dsi = host_to_dsi(host);
+	u8 type = msg->type;
+	ssize_t ret = 0;
+
+	if (MTK_DSI_HOST_IS_READ(type))
+		ret = mtk_dsi_host_read_cmd(dsi, msg);
+	else if (MTK_DSI_HOST_IS_WRITE(type))
+		ret = mtk_dsi_host_write_cmd(dsi, msg);
+
+	return ret;
+}
+
 static const struct mipi_dsi_host_ops mtk_dsi_ops = {
 	.attach = mtk_dsi_host_attach,
 	.detach = mtk_dsi_host_detach,
+	.transfer = mtk_dsi_host_transfer,
 };
 
 static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)