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From: Steve Longerbeam <slongerbeam@gmail.com>
X-Google-Original-From: Steve Longerbeam <steve_longerbeam@mentor.com>
To: linux-media@vger.kernel.org
Cc: Steve Longerbeam <steve_longerbeam@mentor.com>
Subject: [PATCH 20/28] media: imx: Add MIPI CSI-2 Receiver driver
Date: Wed,  6 Jul 2016 16:06:50 -0700
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Adds MIPI CSI-2 Receiver subdev driver. This subdev is required
for sensors with a MIPI CSI2 interface.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
---
 drivers/staging/media/imx/capture/Kconfig     |   8 +
 drivers/staging/media/imx/capture/Makefile    |   1 +
 drivers/staging/media/imx/capture/mipi-csi2.c | 373 ++++++++++++++++++++++++++
 3 files changed, 382 insertions(+)
 create mode 100644 drivers/staging/media/imx/capture/mipi-csi2.c

diff --git a/drivers/staging/media/imx/capture/Kconfig b/drivers/staging/media/imx/capture/Kconfig
index ee2cbab..ac6fce0 100644
--- a/drivers/staging/media/imx/capture/Kconfig
+++ b/drivers/staging/media/imx/capture/Kconfig
@@ -1,3 +1,11 @@
 menu "i.MX5/6 Camera Sub devices"
 
+config IMX_MIPI_CSI2
+       tristate "MIPI CSI2 Receiver Driver"
+       depends on VIDEO_IMX_CAMERA
+       default y
+       ---help---
+         MIPI CSI-2 Receiver driver support. This driver is required
+	 for sensor drivers with a MIPI CSI2 interface.
+
 endmenu
diff --git a/drivers/staging/media/imx/capture/Makefile b/drivers/staging/media/imx/capture/Makefile
index 5c965f9..8961a4f 100644
--- a/drivers/staging/media/imx/capture/Makefile
+++ b/drivers/staging/media/imx/capture/Makefile
@@ -3,3 +3,4 @@ imx-camera-objs := imx-camif.o imx-ic-prpenc.o imx-of.o \
 
 obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-camera.o
 obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-csi.o
+obj-$(CONFIG_IMX_MIPI_CSI2) += mipi-csi2.o
diff --git a/drivers/staging/media/imx/capture/mipi-csi2.c b/drivers/staging/media/imx/capture/mipi-csi2.c
new file mode 100644
index 0000000..8e03c1f
--- /dev/null
+++ b/drivers/staging/media/imx/capture/mipi-csi2.c
@@ -0,0 +1,373 @@
+/*
+ * MIPI CSI-2 Receiver Subdev for Freescale i.MX5/6 SOC.
+ *
+ * Copyright (c) 2012-2014 Mentor Graphics Inc.
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/list.h>
+#include <linux/irq.h>
+#include <linux/of_device.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-of.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-async.h>
+#include <asm/mach/irq.h>
+#include <video/imx-ipu-v3.h>
+
+struct imxcsi2_dev {
+	struct device          *dev;
+	struct v4l2_subdev      sd;
+	struct clk             *dphy_clk;
+	struct clk             *cfg_clk;
+	struct clk             *pix_clk; /* what is this? */
+	void __iomem           *base;
+	int                     intr1;
+	int                     intr2;
+	struct v4l2_of_bus_mipi_csi2 bus;
+	spinlock_t              lock;
+	bool                    on;
+};
+
+#define DEVICE_NAME "imx-mipi-csi2"
+
+/* Register offsets */
+#define CSI2_VERSION            0x000
+#define CSI2_N_LANES            0x004
+#define CSI2_PHY_SHUTDOWNZ      0x008
+#define CSI2_DPHY_RSTZ          0x00c
+#define CSI2_RESETN             0x010
+#define CSI2_PHY_STATE          0x014
+#define CSI2_DATA_IDS_1         0x018
+#define CSI2_DATA_IDS_2         0x01c
+#define CSI2_ERR1               0x020
+#define CSI2_ERR2               0x024
+#define CSI2_MSK1               0x028
+#define CSI2_MSK2               0x02c
+#define CSI2_PHY_TST_CTRL0      0x030
+#define CSI2_PHY_TST_CTRL1      0x034
+#define CSI2_SFT_RESET          0xf00
+
+static inline struct imxcsi2_dev *sd_to_dev(struct v4l2_subdev *sdev)
+{
+	return container_of(sdev, struct imxcsi2_dev, sd);
+}
+
+static inline u32 imxcsi2_read(struct imxcsi2_dev *csi2, unsigned int regoff)
+{
+	return readl(csi2->base + regoff);
+}
+
+static inline void imxcsi2_write(struct imxcsi2_dev *csi2, u32 val,
+				 unsigned int regoff)
+{
+	writel(val, csi2->base + regoff);
+}
+
+static void imxcsi2_set_lanes(struct imxcsi2_dev *csi2)
+{
+	int lanes = csi2->bus.num_data_lanes;
+	unsigned long flags;
+
+	spin_lock_irqsave(&csi2->lock, flags);
+
+	imxcsi2_write(csi2, lanes - 1, CSI2_N_LANES);
+
+	spin_unlock_irqrestore(&csi2->lock, flags);
+}
+
+static void __imxcsi2_enable(struct imxcsi2_dev *csi2, bool enable)
+{
+	if (enable) {
+		imxcsi2_write(csi2, 0xffffffff, CSI2_PHY_SHUTDOWNZ);
+		imxcsi2_write(csi2, 0xffffffff, CSI2_DPHY_RSTZ);
+		imxcsi2_write(csi2, 0xffffffff, CSI2_RESETN);
+	} else {
+		imxcsi2_write(csi2, 0x0, CSI2_PHY_SHUTDOWNZ);
+		imxcsi2_write(csi2, 0x0, CSI2_DPHY_RSTZ);
+		imxcsi2_write(csi2, 0x0, CSI2_RESETN);
+	}
+}
+
+static void imxcsi2_enable(struct imxcsi2_dev *csi2, bool enable)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&csi2->lock, flags);
+	__imxcsi2_enable(csi2, enable);
+	spin_unlock_irqrestore(&csi2->lock, flags);
+}
+
+static void imxcsi2_reset(struct imxcsi2_dev *csi2)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&csi2->lock, flags);
+
+	__imxcsi2_enable(csi2, false);
+
+	imxcsi2_write(csi2, 0x00000001, CSI2_PHY_TST_CTRL0);
+	imxcsi2_write(csi2, 0x00000000, CSI2_PHY_TST_CTRL1);
+	imxcsi2_write(csi2, 0x00000000, CSI2_PHY_TST_CTRL0);
+	imxcsi2_write(csi2, 0x00000002, CSI2_PHY_TST_CTRL0);
+	imxcsi2_write(csi2, 0x00010044, CSI2_PHY_TST_CTRL1);
+	imxcsi2_write(csi2, 0x00000000, CSI2_PHY_TST_CTRL0);
+	imxcsi2_write(csi2, 0x00000014, CSI2_PHY_TST_CTRL1);
+	imxcsi2_write(csi2, 0x00000002, CSI2_PHY_TST_CTRL0);
+	imxcsi2_write(csi2, 0x00000000, CSI2_PHY_TST_CTRL0);
+
+	__imxcsi2_enable(csi2, true);
+
+	spin_unlock_irqrestore(&csi2->lock, flags);
+}
+
+static int imxcsi2_dphy_wait(struct imxcsi2_dev *csi2)
+{
+	u32 reg;
+	int i;
+
+	/* wait for mipi sensor ready */
+	for (i = 0; i < 50; i++) {
+		reg = imxcsi2_read(csi2, CSI2_PHY_STATE);
+		if (reg != 0x200)
+			break;
+		usleep_range(10000, 20000);
+	}
+
+	if (i >= 50) {
+		v4l2_err(&csi2->sd,
+			 "wait for clock lane timeout, phy_state = 0x%08x\n",
+			 reg);
+		return -ETIME;
+	}
+
+	/* wait for mipi stable */
+	for (i = 0; i < 50; i++) {
+		reg = imxcsi2_read(csi2, CSI2_ERR1);
+		if (reg == 0x0)
+			break;
+		usleep_range(10000, 20000);
+	}
+
+	if (i >= 50) {
+		v4l2_err(&csi2->sd,
+			 "wait for controller timeout, err1 = 0x%08x\n",
+			 reg);
+		return -ETIME;
+	}
+
+	/* finally let's wait for active clock on the clock lane */
+	for (i = 0; i < 50; i++) {
+		reg = imxcsi2_read(csi2, CSI2_PHY_STATE);
+		if (reg & (1 << 8))
+			break;
+		usleep_range(10000, 20000);
+	}
+
+	if (i >= 50) {
+		v4l2_err(&csi2->sd,
+			 "wait for active clock timeout, phy_state = 0x%08x\n",
+			 reg);
+		return -ETIME;
+	}
+
+	v4l2_info(&csi2->sd, "ready, dphy version 0x%x\n",
+		  imxcsi2_read(csi2, CSI2_VERSION));
+
+	return 0;
+}
+
+/*
+ * V4L2 subdev operations
+ */
+static int imxcsi2_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct imxcsi2_dev *csi2 = sd_to_dev(sd);
+
+	if (on && !csi2->on) {
+		v4l2_info(&csi2->sd, "power on\n");
+		clk_prepare_enable(csi2->cfg_clk);
+		clk_prepare_enable(csi2->dphy_clk);
+		imxcsi2_set_lanes(csi2);
+		imxcsi2_reset(csi2);
+	} else if (!on && csi2->on) {
+		v4l2_info(&csi2->sd, "power off\n");
+		imxcsi2_enable(csi2, false);
+		clk_disable_unprepare(csi2->dphy_clk);
+		clk_disable_unprepare(csi2->cfg_clk);
+	}
+
+	csi2->on = on;
+	return 0;
+}
+
+static int imxcsi2_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct imxcsi2_dev *csi2 = sd_to_dev(sd);
+	int ret = 0;
+
+	if (enable) {
+		clk_prepare_enable(csi2->pix_clk);
+		ret = imxcsi2_dphy_wait(csi2);
+	} else {
+		clk_disable_unprepare(csi2->pix_clk);
+	}
+
+	return ret;
+}
+
+static struct v4l2_subdev_core_ops imxcsi2_core_ops = {
+	.s_power = imxcsi2_s_power,
+};
+
+static struct v4l2_subdev_video_ops imxcsi2_video_ops = {
+	.s_stream = imxcsi2_s_stream,
+};
+
+static struct v4l2_subdev_ops imxcsi2_subdev_ops = {
+	.core = &imxcsi2_core_ops,
+	.video = &imxcsi2_video_ops,
+};
+
+static int imxcsi2_parse_endpoints(struct imxcsi2_dev *csi2)
+{
+	struct device_node *node = csi2->dev->of_node;
+	struct device_node *epnode;
+	struct v4l2_of_endpoint ep;
+	int ret = 0;
+
+	epnode = of_graph_get_next_endpoint(node, NULL);
+	if (!epnode) {
+		v4l2_err(&csi2->sd, "failed to get endpoint node\n");
+		return -EINVAL;
+	}
+
+	v4l2_of_parse_endpoint(epnode, &ep);
+	if (ep.bus_type != V4L2_MBUS_CSI2) {
+		v4l2_err(&csi2->sd, "invalid bus type, must be MIPI CSI2\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	csi2->bus = ep.bus.mipi_csi2;
+
+	v4l2_info(&csi2->sd, "data lanes: %d\n", csi2->bus.num_data_lanes);
+	v4l2_info(&csi2->sd, "flags: 0x%08x\n", csi2->bus.flags);
+out:
+	of_node_put(epnode);
+	return ret;
+}
+
+static int imxcsi2_probe(struct platform_device *pdev)
+{
+	struct imxcsi2_dev *csi2;
+	struct resource *res;
+	int ret;
+
+	csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL);
+	if (!csi2)
+		return -ENOMEM;
+
+	csi2->dev = &pdev->dev;
+	spin_lock_init(&csi2->lock);
+
+	v4l2_subdev_init(&csi2->sd, &imxcsi2_subdev_ops);
+	v4l2_set_subdevdata(&csi2->sd, &pdev->dev);
+	csi2->sd.dev = &pdev->dev;
+	csi2->sd.owner = THIS_MODULE;
+	strcpy(csi2->sd.name, DEVICE_NAME);
+
+	ret = imxcsi2_parse_endpoints(csi2);
+	if (ret)
+		return ret;
+
+	csi2->cfg_clk = devm_clk_get(&pdev->dev, "cfg_clk");
+	if (IS_ERR(csi2->cfg_clk)) {
+		v4l2_err(&csi2->sd, "failed to get cfg clock\n");
+		ret = PTR_ERR(csi2->cfg_clk);
+		return ret;
+	}
+
+	csi2->dphy_clk = devm_clk_get(&pdev->dev, "dphy_clk");
+	if (IS_ERR(csi2->dphy_clk)) {
+		v4l2_err(&csi2->sd, "failed to get dphy clock\n");
+		ret = PTR_ERR(csi2->dphy_clk);
+		return ret;
+	}
+
+	csi2->pix_clk = devm_clk_get(&pdev->dev, "pix_clk");
+	if (IS_ERR(csi2->pix_clk)) {
+		v4l2_err(&csi2->sd, "failed to get pixel clock\n");
+		ret = PTR_ERR(csi2->pix_clk);
+		return ret;
+	}
+
+	csi2->intr1 = platform_get_irq(pdev, 0);
+	csi2->intr2 = platform_get_irq(pdev, 1);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	if (!res || csi2->intr1 < 0 || csi2->intr2 < 0) {
+		v4l2_err(&csi2->sd, "failed to get platform resources\n");
+		return -ENODEV;
+	}
+
+	csi2->base = devm_ioremap(&pdev->dev, res->start, PAGE_SIZE);
+	if (!csi2->base) {
+		v4l2_err(&csi2->sd, "failed to map CSI-2 registers\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, &csi2->sd);
+
+	return v4l2_async_register_subdev(&csi2->sd);
+}
+
+static int imxcsi2_remove(struct platform_device *pdev)
+{
+	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+	struct imxcsi2_dev *csi2 = sd_to_dev(sd);
+
+	imxcsi2_s_power(sd, 0);
+
+	v4l2_async_unregister_subdev(&csi2->sd);
+	v4l2_device_unregister_subdev(sd);
+
+	return 0;
+}
+
+static const struct of_device_id imxcsi2_dt_ids[] = {
+	{ .compatible = "fsl,imx-mipi-csi2", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imxcsi2_dt_ids);
+
+static struct platform_driver imxcsi2_driver = {
+	.driver = {
+		.name = DEVICE_NAME,
+		.owner = THIS_MODULE,
+		.of_match_table = imxcsi2_dt_ids,
+	},
+	.probe = imxcsi2_probe,
+	.remove = imxcsi2_remove,
+};
+
+module_platform_driver(imxcsi2_driver);
+
+MODULE_DESCRIPTION("i.MX5/6 MIPI CSI-2 Receiver driver");
+MODULE_AUTHOR("Mentor Graphics Inc.");
+MODULE_LICENSE("GPL");
+