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Subject[PATCH 2/2] media: i2c: Add driver for RDACM21 camera module
Date
The RDACM21 is a GMSL camera supporting 1280x1080 resolution images,
developed by IMI based on an Omnivision OV10640 sensor, an Omnivision
OV490 ISP and a Maxim MAX9271 GMSL serializer.

The driver uses the max9271 library module, to maximize code reuse with
other camera module drivers using the same serializer, such as rdacm20.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
MAINTAINERS | 12 +
drivers/media/i2c/Kconfig | 13 +
drivers/media/i2c/Makefile | 2 +
drivers/media/i2c/rdacm21.c | 541 ++++++++++++++++++++++++++++++++++++
4 files changed, 568 insertions(+)
create mode 100644 drivers/media/i2c/rdacm21.c

diff --git a/MAINTAINERS b/MAINTAINERS
index d3126fc2cca2..2349ff8b1bdb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14591,6 +14591,18 @@ F: drivers/media/i2c/max9271.c
F: drivers/media/i2c/max9271.h
F: drivers/media/i2c/rdacm20.c

+RDACM21 Camera Sensor
+M: Jacopo Mondi <jacopo+renesas@jmondi.org>
+M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
+M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
+L: linux-media@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/media/i2c/rdacm2x-gmsl.yaml
+F: drivers/media/i2c/max9271.c
+F: drivers/media/i2c/max9271.h
+F: drivers/media/i2c/rdacm21.c
+
RDC R-321X SoC
M: Florian Fainelli <florian@openwrt.org>
S: Maintained
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 878f66ef2719..cfb3f0bcc4fc 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1184,6 +1184,19 @@ config VIDEO_RDACM20
This camera should be used in conjunction with a GMSL
deserialiser such as the MAX9286.

+config VIDEO_RDACM21
+ tristate "IMI RDACM21 camera support"
+ depends on I2C
+ select V4L2_FWNODE
+ select VIDEO_V4L2_SUBDEV_API
+ select MEDIA_CONTROLLER
+ help
+ This driver supports the IMI RDACM21 GMSL camera, used in
+ ADAS systems.
+
+ This camera should be used in conjunction with a GMSL
+ deserialiser such as the MAX9286.
+
config VIDEO_RJ54N1
tristate "Sharp RJ54N1CB0C sensor support"
depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index f0a77473979d..f3641b58929d 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -122,6 +122,8 @@ obj-$(CONFIG_VIDEO_IMX355) += imx355.o
obj-$(CONFIG_VIDEO_MAX9286) += max9286.o
rdacm20-camera_module-objs := rdacm20.o max9271.o
obj-$(CONFIG_VIDEO_RDACM20) += rdacm20-camera_module.o
+rdacm21-camera_module-objs := rdacm21.o max9271.o
+obj-$(CONFIG_VIDEO_RDACM21) += rdacm21-camera_module.o
obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o

obj-$(CONFIG_SDR_MAX2175) += max2175.o
diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
new file mode 100644
index 000000000000..9cb57b0058c7
--- /dev/null
+++ b/drivers/media/i2c/rdacm21.c
@@ -0,0 +1,541 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * IMI RDACM21 GMSL Camera Driver
+ *
+ * Copyright (C) 2017-2020 Jacopo Mondi
+ * Copyright (C) 2017-2019 Kieran Bingham
+ * Copyright (C) 2017-2019 Laurent Pinchart
+ * Copyright (C) 2017-2019 Niklas Söderlund
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/fwnode.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+#include "max9271.h"
+
+#define OV10640_I2C_ADDRESS 0x30
+#define OV10640_ID_LOW 0xa6
+
+#define OV490_I2C_ADDRESS 0x24
+
+#define OV490_ISP_HSIZE_LOW 0x60
+#define OV490_ISP_HSIZE_HIGH 0x61
+#define OV490_ISP_VSIZE_LOW 0x62
+#define OV490_ISP_VSIZE_HIGH 0x63
+
+#define OV490_PID 0x300a
+#define OV490_VER 0x300b
+#define OV490_ID_VAL 0x0490
+#define OV490_ID(_p, _v) ((((_p) & 0xff) << 8) | ((_v) & 0xff))
+
+/*
+ * As the driver supports a single format and resolution we can hardcode
+ * the pixel rate. The OV490 pixel clock is set to 100MHz, set the pixel rate
+ * to 50Mhz (2 samples per pixels).
+ */
+#define OV10640_PIXEL_RATE (50000000)
+
+struct rdacm21_device {
+ struct device *dev;
+ struct max9271_device *serializer;
+ struct i2c_client *isp;
+ struct v4l2_subdev sd;
+ struct media_pad pad;
+ struct v4l2_mbus_framefmt fmt;
+ struct v4l2_ctrl_handler ctrls;
+ u32 addrs[32];
+ bool high_threshold;
+};
+
+static inline struct rdacm21_device *sd_to_rdacm21(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct rdacm21_device, sd);
+}
+
+static inline struct rdacm21_device *i2c_to_rdacm21(struct i2c_client *client)
+{
+ return sd_to_rdacm21(i2c_get_clientdata(client));
+}
+
+static const struct ov490_reg {
+ u16 reg;
+ u8 val;
+} ov490_regs_wizard[] = {
+ {0xfffd, 0x80},
+ {0xfffe, 0x82},
+ {0x0071, 0x11},
+ {0x0075, 0x11},
+ {0xfffe, 0x29},
+ {0x6010, 0x01},
+ /*
+ * OV490 EMB line disable in YUV and RAW data,
+ * NOTE: EMB line is still used in ISP and sensor
+ */
+ {0xe000, 0x14},
+ {0xfffe, 0x28},
+ {0x6000, 0x04},
+ {0x6004, 0x00},
+ /*
+ * PCLK polarity - useless due to silicon bug.
+ * Use 0x808000bb register instead.
+ */
+ {0x6008, 0x00},
+ {0xfffe, 0x80},
+ {0x0091, 0x00},
+ /* bit[3]=0 - PCLK polarity workaround. */
+ {0x00bb, 0x1d},
+ /* Ov490 FSIN: app_fsin_from_fsync */
+ {0xfffe, 0x85},
+ {0x0008, 0x00},
+ {0x0009, 0x01},
+ /* FSIN0 source. */
+ {0x000A, 0x05},
+ {0x000B, 0x00},
+ /* FSIN0 delay. */
+ {0x0030, 0x02},
+ {0x0031, 0x00},
+ {0x0032, 0x00},
+ {0x0033, 0x00},
+ /* FSIN1 delay. */
+ {0x0038, 0x02},
+ {0x0039, 0x00},
+ {0x003A, 0x00},
+ {0x003B, 0x00},
+ /* FSIN0 length. */
+ {0x0070, 0x2C},
+ {0x0071, 0x01},
+ {0x0072, 0x00},
+ {0x0073, 0x00},
+ /* FSIN1 length. */
+ {0x0074, 0x64},
+ {0x0075, 0x00},
+ {0x0076, 0x00},
+ {0x0077, 0x00},
+ {0x0000, 0x14},
+ {0x0001, 0x00},
+ {0x0002, 0x00},
+ {0x0003, 0x00},
+ /*
+ * Load fsin0,load fsin1,load other,
+ * It will be cleared automatically.
+ */
+ {0x0004, 0x32},
+ {0x0005, 0x00},
+ {0x0006, 0x00},
+ {0x0007, 0x00},
+ {0xfffe, 0x80},
+ /* Sensor FSIN. */
+ {0x0081, 0x00},
+ /* ov10640 FSIN enable */
+ {0xfffe, 0x19},
+ {0x5000, 0x00},
+ {0x5001, 0x30},
+ {0x5002, 0x8c},
+ {0x5003, 0xb2},
+ {0xfffe, 0x80},
+ {0x00c0, 0xc1},
+ /* ov10640 HFLIP=1 by default */
+ {0xfffe, 0x19},
+ {0x5000, 0x01},
+ {0x5001, 0x00},
+ {0xfffe, 0x80},
+ {0x00c0, 0xdc},
+};
+
+static int ov490_read(struct rdacm21_device *dev, u16 reg, u8 *val)
+{
+ u8 buf[2] = { reg >> 8, reg & 0xff };
+ int ret;
+
+ ret = i2c_master_send(dev->isp, buf, 2);
+ if (ret < 0) {
+ dev_err(dev->dev, "%s: register 0x%04x read failed (%d)\n",
+ __func__, reg, ret);
+ return ret;
+ }
+
+ ret = i2c_master_recv(dev->isp, val, 1);
+ if (ret < 0) {
+ dev_err(dev->dev, "%s: register 0x%04x read failed (%d)\n",
+ __func__, reg, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ov490_write(struct rdacm21_device *dev, u16 reg, u8 val)
+{
+ u8 buf[3] = { reg >> 8, reg & 0xff, val };
+ int ret;
+
+ ret = i2c_master_send(dev->isp, buf, 3);
+ if (ret < 0) {
+ dev_err(dev->dev, "%s: register 0x%04x write failed (%d)\n",
+ __func__, reg, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rdacm21_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct rdacm21_device *dev = sd_to_rdacm21(sd);
+
+ /*
+ * Enable serial link now that the ISP provides a valid pixel clock
+ * to start serializing video data on the GMSL link.
+ */
+ return max9271_set_serial_link(dev->serializer, enable);
+}
+
+static int rdacm21_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_mbus_code_enum *mbus_enum)
+{
+ if (mbus_enum->index > 0)
+ return -EINVAL;
+
+ mbus_enum->code = MEDIA_BUS_FMT_YUYV8_1X16;
+
+ return 0;
+}
+
+static int rdacm21_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct v4l2_mbus_framefmt *mf = &format->format;
+ struct rdacm21_device *dev = sd_to_rdacm21(sd);
+
+ mf->width = dev->fmt.width;
+ mf->height = dev->fmt.height;
+ mf->code = MEDIA_BUS_FMT_YUYV8_1X16;
+ mf->colorspace = V4L2_COLORSPACE_SRGB;
+ mf->field = V4L2_FIELD_NONE;
+ mf->ycbcr_enc = V4L2_YCBCR_ENC_601;
+ mf->quantization = V4L2_QUANTIZATION_FULL_RANGE;
+ mf->xfer_func = V4L2_XFER_FUNC_NONE;
+
+ return 0;
+}
+
+static struct v4l2_subdev_video_ops rdacm21_video_ops = {
+ .s_stream = rdacm21_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops rdacm21_subdev_pad_ops = {
+ .enum_mbus_code = rdacm21_enum_mbus_code,
+ .get_fmt = rdacm21_get_fmt,
+ .set_fmt = rdacm21_get_fmt,
+};
+
+static struct v4l2_subdev_ops rdacm21_subdev_ops = {
+ .video = &rdacm21_video_ops,
+ .pad = &rdacm21_subdev_pad_ops,
+};
+
+static int ov490_initialize(struct rdacm21_device *dev)
+{
+ unsigned int ov490_pid_retry = 20;
+ unsigned int timeout;
+ u8 pid, ver, val;
+ unsigned int i;
+ int ret;
+
+ /* Read OV490 ID to test communications. */
+pid_retry:
+ ret = ov490_write(dev, 0xfffd, 0x80);
+ ret = ov490_write(dev, 0xfffe, 0x80);
+ usleep_range(100, 150);
+
+ ret = ov490_read(dev, OV490_PID, &pid);
+ if (ret < 0) {
+ /* Give OV490 more cycles to exit from reset. */
+ if (ov490_pid_retry--) {
+ usleep_range(500, 1000);
+ goto pid_retry;
+ }
+
+ dev_err(dev->dev, "OV490 PID read failed (%d)\n", ret);
+ return ret;
+ }
+
+ ret = ov490_read(dev, OV490_VER, &ver);
+ if (ret < 0) {
+ dev_err(dev->dev, "OV490 VERSION read failed (%d)\n", ret);
+ return ret;
+ }
+
+ if (OV490_ID(pid, ver) != OV490_ID_VAL) {
+ dev_err(dev->dev, "OV490 ID mismatch: (0x%04x)\n",
+ OV490_ID(pid, ver));
+ return -ENODEV;
+ }
+
+ /* Wait for firmware boot by reading streamon status. */
+ ov490_write(dev, 0xfffd, 0x80);
+ ov490_write(dev, 0xfffe, 0x29);
+ usleep_range(100, 150);
+ for (timeout = 300; timeout > 0; timeout--) {
+ ov490_read(dev, 0xd000, &val);
+ if (val == 0x0c)
+ break;
+ mdelay(1);
+ }
+ if (!timeout) {
+ dev_err(dev->dev, "Timeout firmware boot wait\n");
+ return -ENODEV;
+ }
+ dev_dbg(dev->dev, "Firmware booted in %u msec\n", 300 - timeout);
+
+ /* Read OV10640 ID to test communications. */
+ ov490_write(dev, 0xfffd, 0x80);
+ ov490_write(dev, 0xfffe, 0x19);
+ usleep_range(100, 150);
+
+ ov490_write(dev, 0x5000, 0x01);
+ ov490_write(dev, 0x5001, 0x30);
+ ov490_write(dev, 0x5002, 0x0a);
+
+ ov490_write(dev, 0xfffe, 0x80);
+ usleep_range(100, 150);
+ ov490_write(dev, 0xc0, 0xc1);
+ ov490_write(dev, 0xfffe, 0x19);
+ usleep_range(1000, 1500);
+ ov490_read(dev, 0x5000, &val);
+ if (val != OV10640_ID_LOW) {
+ dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val);
+ return -ENODEV;
+ }
+ dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val);
+
+ for (i = 0; i < ARRAY_SIZE(ov490_regs_wizard); ++i) {
+ ret = ov490_write(dev, ov490_regs_wizard[i].reg,
+ ov490_regs_wizard[i].val);
+ if (ret < 0) {
+ dev_err(dev->dev,
+ "%s: register %u (0x%04x) write failed (%d)\n",
+ __func__, i, ov490_regs_wizard[i].reg, ret);
+ return -EIO;
+ }
+
+ usleep_range(100, 150);
+ }
+
+ /*
+ * The ISP is programmed with the content of a serial flash memory.
+ * Read the firmware configuration to reflect it through the V4L2 APIs.
+ */
+ ov490_write(dev, 0xfffd, 0x80);
+ ov490_write(dev, 0xfffe, 0x82);
+ usleep_range(100, 150);
+ ov490_read(dev, OV490_ISP_HSIZE_HIGH, &val);
+ dev->fmt.width = (val & 0xf) << 8;
+ ov490_read(dev, OV490_ISP_HSIZE_LOW, &val);
+ dev->fmt.width |= (val & 0xff);
+
+ ov490_read(dev, OV490_ISP_VSIZE_HIGH, &val);
+ dev->fmt.height = (val & 0xf) << 8;
+ ov490_read(dev, OV490_ISP_VSIZE_LOW, &val);
+ dev->fmt.height |= val & 0xff;
+
+ /* Set bus width to 12 bits [0:11] */
+ ov490_write(dev, 0xfffd, 0x80);
+ ov490_write(dev, 0xfffe, 0x28);
+ usleep_range(100, 150);
+ ov490_write(dev, 0x6009, 0x10);
+
+ dev_info(dev->dev, "Identified RDACM21 camera module\n");
+
+ return 0;
+}
+
+static int rdacm21_initialize(struct rdacm21_device *dev)
+{
+ int ret;
+
+ /* Verify communication with the MAX9271: ping to wakeup. */
+ dev->serializer->client->addr = MAX9271_DEFAULT_ADDR;
+ i2c_smbus_read_byte(dev->serializer->client);
+
+ /* Serial link disabled during config as it needs a valid pixel clk. */
+ ret = max9271_set_serial_link(dev->serializer, false);
+ if (ret)
+ return ret;
+
+ /* Set GPO high to hold OV490 in reset during max9271 configuration. */
+ ret = max9271_set_gpios(dev->serializer, MAX9271_GPO);
+ if (ret)
+ return ret;
+
+ /* Configure I2C bus at 105Kbps speed and configure GMSL link. */
+ ret = max9271_configure_i2c(dev->serializer,
+ MAX9271_I2CSLVSH_469NS_234NS |
+ MAX9271_I2CSLVTO_1024US |
+ MAX9271_I2CMSTBT_105KBPS);
+ if (ret)
+ return ret;
+
+ ret = max9271_configure_gmsl_link(dev->serializer);
+ if (ret)
+ return ret;
+
+ ret = max9271_set_address(dev->serializer, dev->addrs[0]);
+ if (ret)
+ return ret;
+ dev->serializer->client->addr = dev->addrs[0];
+
+ /*
+ * Release OV490 from reset and program address translation
+ * before performing OV490 configuration.
+ */
+ ret = max9271_clear_gpios(dev->serializer, MAX9271_GPO);
+ if (ret)
+ return ret;
+
+ ret = max9271_set_translation(dev->serializer, dev->addrs[1],
+ OV490_I2C_ADDRESS);
+ if (ret)
+ return ret;
+ dev->isp->addr = dev->addrs[1];
+
+ ret = ov490_initialize(dev);
+ if (ret)
+ return ret;
+
+ /*
+ * Set reverse channel high threshold to increase noise immunity.
+ *
+ * This should be compensated by increasing the reverse channel
+ * amplitude on the remote deserializer side.
+ */
+ ret = max9271_set_high_threshold(dev->serializer, true);
+ if (ret)
+ return ret;
+ dev->high_threshold = true;
+
+ return 0;
+}
+
+static int rdacm21_probe(struct i2c_client *client)
+{
+ struct rdacm21_device *dev;
+ struct fwnode_handle *ep;
+ int ret;
+
+ dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+ dev->dev = &client->dev;
+
+ dev->serializer = devm_kzalloc(&client->dev, sizeof(*dev->serializer),
+ GFP_KERNEL);
+ if (!dev->serializer)
+ return -ENOMEM;
+
+ dev->serializer->client = client;
+
+ ret = of_property_read_u32_array(client->dev.of_node, "reg",
+ dev->addrs, 2);
+ if (ret < 0) {
+ dev_err(dev->dev, "Invalid DT reg property: %d\n", ret);
+ return -EINVAL;
+ }
+
+ /* Create the dummy I2C client for the sensor. */
+ dev->isp = i2c_new_dummy_device(client->adapter, OV490_I2C_ADDRESS);
+ if (IS_ERR(dev->isp))
+ return PTR_ERR(dev->isp);
+
+ ret = rdacm21_initialize(dev);
+ if (ret < 0)
+ goto error;
+
+ /* Initialize and register the subdevice. */
+ v4l2_i2c_subdev_init(&dev->sd, client, &rdacm21_subdev_ops);
+ dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+ v4l2_ctrl_handler_init(&dev->ctrls, 1);
+ v4l2_ctrl_new_std(&dev->ctrls, NULL, V4L2_CID_PIXEL_RATE,
+ OV10640_PIXEL_RATE, OV10640_PIXEL_RATE, 1,
+ OV10640_PIXEL_RATE);
+ dev->sd.ctrl_handler = &dev->ctrls;
+
+ ret = dev->ctrls.error;
+ if (ret)
+ goto error_free_ctrls;
+
+ dev->pad.flags = MEDIA_PAD_FL_SOURCE;
+ dev->sd.entity.flags |= MEDIA_ENT_F_CAM_SENSOR;
+ ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
+ if (ret < 0)
+ goto error_free_ctrls;
+
+ ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev), NULL);
+ if (!ep) {
+ dev_err(&client->dev, "Unable to get endpoint in node %pOF\n",
+ client->dev.of_node);
+ ret = -ENOENT;
+ goto error_free_ctrls;
+ }
+ dev->sd.fwnode = ep;
+
+ ret = v4l2_async_register_subdev(&dev->sd);
+ if (ret)
+ goto error_put_node;
+
+ return 0;
+
+error_put_node:
+ fwnode_handle_put(dev->sd.fwnode);
+error_free_ctrls:
+ v4l2_ctrl_handler_free(&dev->ctrls);
+error:
+ i2c_unregister_device(dev->isp);
+
+ return ret;
+}
+
+static int rdacm21_remove(struct i2c_client *client)
+{
+ struct rdacm21_device *dev = i2c_to_rdacm21(client);
+
+ fwnode_handle_put(dev->sd.fwnode);
+ v4l2_async_unregister_subdev(&dev->sd);
+ i2c_unregister_device(dev->isp);
+
+ return 0;
+}
+
+static const struct of_device_id rdacm21_of_ids[] = {
+ { .compatible = "imi,rdacm21" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rdacm21_of_ids);
+
+static struct i2c_driver rdacm21_i2c_driver = {
+ .driver = {
+ .name = "rdacm21",
+ .of_match_table = rdacm21_of_ids,
+ },
+ .probe_new = rdacm21_probe,
+ .remove = rdacm21_remove,
+};
+
+module_i2c_driver(rdacm21_i2c_driver);
+
+MODULE_DESCRIPTION("GMSL Camera driver for RDACM21");
+MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov");
+MODULE_LICENSE("GPL v2");
--
2.28.0
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