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linux/drivers/media/i2c/rdacm21.c
Jacopo Mondi 5f58ac04f3 media: i2c: rdamc21: Fix warning on u8 cast 
Sparse reports a warning on a cast to u8 of a 16 bits constant.

drivers/media/i2c/rdacm21.c:348:62: warning: cast truncates bits
from constant value (300a becomes a)

Even if the behaviour is intended, silence the sparse warning replacing
the cast with a bitwise & operation.

Fixes: a59f853b3b ("media: i2c: Add driver for RDACM21 camera module")
Reported-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2021-04-09 13:16:56 +02:00

624 lines
15 KiB
C
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// 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 MAX9271_RESET_CYCLES 10
#define OV490_I2C_ADDRESS 0x24
#define OV490_PAGE_HIGH_REG 0xfffd
#define OV490_PAGE_LOW_REG 0xfffe
/*
* The SCCB slave handling is undocumented; the registers naming scheme is
* totally arbitrary.
*/
#define OV490_SCCB_SLAVE_WRITE 0x00
#define OV490_SCCB_SLAVE_READ 0x01
#define OV490_SCCB_SLAVE0_DIR 0x80195000
#define OV490_SCCB_SLAVE0_ADDR_HIGH 0x80195001
#define OV490_SCCB_SLAVE0_ADDR_LOW 0x80195002
#define OV490_DVP_CTRL3 0x80286009
#define OV490_ODS_CTRL_FRAME_OUTPUT_EN 0x0c
#define OV490_ODS_CTRL 0x8029d000
#define OV490_HOST_CMD 0x808000c0
#define OV490_HOST_CMD_TRIGGER 0xc1
#define OV490_ID_VAL 0x0490
#define OV490_ID(_p, _v) ((((_p) & 0xff) << 8) | ((_v) & 0xff))
#define OV490_PID 0x8080300a
#define OV490_VER 0x8080300b
#define OV490_PID_TIMEOUT 20
#define OV490_OUTPUT_EN_TIMEOUT 300
#define OV490_GPIO0 BIT(0)
#define OV490_SPWDN0 BIT(0)
#define OV490_GPIO_SEL0 0x80800050
#define OV490_GPIO_SEL1 0x80800051
#define OV490_GPIO_DIRECTION0 0x80800054
#define OV490_GPIO_DIRECTION1 0x80800055
#define OV490_GPIO_OUTPUT_VALUE0 0x80800058
#define OV490_GPIO_OUTPUT_VALUE1 0x80800059
#define OV490_ISP_HSIZE_LOW 0x80820060
#define OV490_ISP_HSIZE_HIGH 0x80820061
#define OV490_ISP_VSIZE_LOW 0x80820062
#define OV490_ISP_VSIZE_HIGH 0x80820063
#define OV10640_ID_HIGH 0xa6
#define OV10640_CHIP_ID 0x300a
#define OV10640_PIXEL_RATE 55000000
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[2];
u16 last_page;
};
static inline struct rdacm21_device *sd_to_rdacm21(struct v4l2_subdev *sd)
{
return container_of(sd, struct rdacm21_device, sd);
}
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 };
int ret;
ret = i2c_master_send(dev->isp, buf, 2);
if (ret == 2)
ret = i2c_master_recv(dev->isp, val, 1);
if (ret < 0) {
dev_dbg(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, 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 ov490_set_page(struct rdacm21_device *dev, u16 page)
{
u8 page_high = page >> 8;
u8 page_low = page;
int ret;
if (page == dev->last_page)
return 0;
if (page_high != (dev->last_page >> 8)) {
ret = ov490_write(dev, OV490_PAGE_HIGH_REG, page_high);
if (ret)
return ret;
}
if (page_low != (u8)dev->last_page) {
ret = ov490_write(dev, OV490_PAGE_LOW_REG, page_low);
if (ret)
return ret;
}
dev->last_page = page;
usleep_range(100, 150);
return 0;
}
static int ov490_read_reg(struct rdacm21_device *dev, u32 reg, u8 *val)
{
int ret;
ret = ov490_set_page(dev, reg >> 16);
if (ret)
return ret;
ret = ov490_read(dev, (u16)reg, val);
if (ret)
return ret;
dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, *val);
return 0;
}
static int ov490_write_reg(struct rdacm21_device *dev, u32 reg, u8 val)
{
int ret;
ret = ov490_set_page(dev, reg >> 16);
if (ret)
return ret;
ret = ov490_write(dev, (u16)reg, val);
if (ret)
return ret;
dev_dbg(dev->dev, "%s: 0x%08x = 0x%02x\n", __func__, reg, val);
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 *code)
{
if (code->pad || code->index > 0)
return -EINVAL;
code->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);
if (format->pad)
return -EINVAL;
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 const 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 const struct v4l2_subdev_ops rdacm21_subdev_ops = {
.video = &rdacm21_video_ops,
.pad = &rdacm21_subdev_pad_ops,
};
static int ov10640_initialize(struct rdacm21_device *dev)
{
u8 val;
/* Power-up OV10640 by setting RESETB and PWDNB pins high. */
ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0);
ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0);
ov490_write_reg(dev, OV490_GPIO_DIRECTION0, OV490_GPIO0);
ov490_write_reg(dev, OV490_GPIO_DIRECTION1, OV490_SPWDN0);
ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0);
ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_SPWDN0);
usleep_range(3000, 5000);
/* Read OV10640 ID to test communications. */
ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, OV490_SCCB_SLAVE_READ);
ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, OV10640_CHIP_ID >> 8);
ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, OV10640_CHIP_ID & 0xff);
/* Trigger SCCB slave transaction and give it some time to complete. */
ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER);
usleep_range(1000, 1500);
ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val);
if (val != OV10640_ID_HIGH) {
dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val);
return -ENODEV;
}
dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val);
return 0;
}
static int ov490_initialize(struct rdacm21_device *dev)
{
u8 pid, ver, val;
unsigned int i;
int ret;
/*
* Read OV490 Id to test communications. Give it up to 40msec to
* exit from reset.
*/
for (i = 0; i < OV490_PID_TIMEOUT; ++i) {
ret = ov490_read_reg(dev, OV490_PID, &pid);
if (ret == 0)
break;
usleep_range(1000, 2000);
}
if (i == OV490_PID_TIMEOUT) {
dev_err(dev->dev, "OV490 PID read failed (%d)\n", ret);
return ret;
}
ret = ov490_read_reg(dev, OV490_VER, &ver);
if (ret < 0)
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. */
for (i = 0; i < OV490_OUTPUT_EN_TIMEOUT; ++i) {
ov490_read_reg(dev, OV490_ODS_CTRL, &val);
if (val == OV490_ODS_CTRL_FRAME_OUTPUT_EN)
break;
usleep_range(1000, 2000);
}
if (i == OV490_OUTPUT_EN_TIMEOUT) {
dev_err(dev->dev, "Timeout waiting for firmware boot\n");
return -ENODEV;
}
ret = ov10640_initialize(dev);
if (ret)
return ret;
/* Program OV490 with register-value table. */
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_read_reg(dev, OV490_ISP_HSIZE_HIGH, &val);
dev->fmt.width = (val & 0xf) << 8;
ov490_read_reg(dev, OV490_ISP_HSIZE_LOW, &val);
dev->fmt.width |= (val & 0xff);
ov490_read_reg(dev, OV490_ISP_VSIZE_HIGH, &val);
dev->fmt.height = (val & 0xf) << 8;
ov490_read_reg(dev, OV490_ISP_VSIZE_LOW, &val);
dev->fmt.height |= val & 0xff;
/* Set bus width to 12 bits with [0:11] ordering. */
ov490_write_reg(dev, OV490_DVP_CTRL3, 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);
usleep_range(3000, 5000);
/* Enable reverse channel and disable the serial link. */
ret = max9271_set_serial_link(&dev->serializer, false);
if (ret)
return ret;
/* Configure I2C bus at 105Kbps speed and configure GMSL. */
ret = max9271_configure_i2c(&dev->serializer,
MAX9271_I2CSLVSH_469NS_234NS |
MAX9271_I2CSLVTO_1024US |
MAX9271_I2CMSTBT_105KBPS);
if (ret)
return ret;
ret = max9271_verify_id(&dev->serializer);
if (ret)
return ret;
/* Enable GPIO1 and hold OV490 in reset during max9271 configuration. */
ret = max9271_enable_gpios(&dev->serializer, MAX9271_GPIO1OUT);
if (ret)
return ret;
ret = max9271_clear_gpios(&dev->serializer, MAX9271_GPIO1OUT);
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];
ret = max9271_set_translation(&dev->serializer, dev->addrs[1],
OV490_I2C_ADDRESS);
if (ret)
return ret;
dev->isp->addr = dev->addrs[1];
/* Release OV490 from reset and initialize it. */
ret = max9271_set_gpios(&dev->serializer, MAX9271_GPIO1OUT);
if (ret)
return ret;
usleep_range(3000, 5000);
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.
*/
return max9271_set_high_threshold(&dev->serializer, true);
}
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.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 = sd_to_rdacm21(i2c_get_clientdata(client));
v4l2_async_unregister_subdev(&dev->sd);
v4l2_ctrl_handler_free(&dev->ctrls);
i2c_unregister_device(dev->isp);
fwnode_handle_put(dev->sd.fwnode);
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");
MODULE_LICENSE("GPL v2");
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