// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Renesas Electronics Corp.
*
* Driver for Renesas R-Car ISP Channel Selector
*
* The ISP hardware is capable of more than just channel selection, features
* such as demosaicing, white balance control and color space conversion are
* also possible. These more advanced features are not supported by the driver
* due to lack of documentation.
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <media/mipi-csi2.h>
#include <media/v4l2-subdev.h>
#define ISPINPUTSEL0_REG 0x0008
#define ISPINPUTSEL0_SEL_CSI0 BIT(31)
#define ISPSTART_REG 0x0014
#define ISPSTART_START 0xffff
#define ISPSTART_STOP 0x0000
#define ISPPROCMODE_DT_REG(n) (0x1100 + (0x4 * (n)))
#define ISPPROCMODE_DT_PROC_MODE_VC3(pm) (((pm) & 0x3f) << 24)
#define ISPPROCMODE_DT_PROC_MODE_VC2(pm) (((pm) & 0x3f) << 16)
#define ISPPROCMODE_DT_PROC_MODE_VC1(pm) (((pm) & 0x3f) << 8)
#define ISPPROCMODE_DT_PROC_MODE_VC0(pm) ((pm) & 0x3f)
#define ISPCS_FILTER_ID_CH_REG(n) (0x3000 + (0x0100 * (n)))
#define ISPCS_DT_CODE03_CH_REG(n) (0x3008 + (0x100 * (n)))
#define ISPCS_DT_CODE03_EN3 BIT(31)
#define ISPCS_DT_CODE03_DT3(dt) (((dt) & 0x3f) << 24)
#define ISPCS_DT_CODE03_EN2 BIT(23)
#define ISPCS_DT_CODE03_DT2(dt) (((dt) & 0x3f) << 16)
#define ISPCS_DT_CODE03_EN1 BIT(15)
#define ISPCS_DT_CODE03_DT1(dt) (((dt) & 0x3f) << 8)
#define ISPCS_DT_CODE03_EN0 BIT(7)
#define ISPCS_DT_CODE03_DT0(dt) ((dt) & 0x3f)
struct rcar_isp_format {
u32 code;
unsigned int datatype;
unsigned int procmode;
};
static const struct rcar_isp_format rcar_isp_formats[] = {
{
.code = MEDIA_BUS_FMT_RGB888_1X24,
.datatype = MIPI_CSI2_DT_RGB888,
.procmode = 0x15
}, {
.code = MEDIA_BUS_FMT_Y10_1X10,
.datatype = MIPI_CSI2_DT_RAW10,
.procmode = 0x10,
}, {
.code = MEDIA_BUS_FMT_UYVY8_1X16,
.datatype = MIPI_CSI2_DT_YUV422_8B,
.procmode = 0x0c,
}, {
.code = MEDIA_BUS_FMT_YUYV8_1X16,
.datatype = MIPI_CSI2_DT_YUV422_8B,
.procmode = 0x0c,
}, {
.code = MEDIA_BUS_FMT_UYVY8_2X8,
.datatype = MIPI_CSI2_DT_YUV422_8B,
.procmode = 0x0c,
}, {
.code = MEDIA_BUS_FMT_YUYV10_2X10,
.datatype = MIPI_CSI2_DT_YUV422_8B,
.procmode = 0x0c,
},
};
static const struct rcar_isp_format *risp_code_to_fmt(unsigned int code)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(rcar_isp_formats); i++) {
if (rcar_isp_formats[i].code == code)
return &rcar_isp_formats[i];
}
return NULL;
}
enum rcar_isp_input {
RISP_CSI_INPUT0,
RISP_CSI_INPUT1,
};
enum rcar_isp_pads {
RCAR_ISP_SINK,
RCAR_ISP_PORT0,
RCAR_ISP_PORT1,
RCAR_ISP_PORT2,
RCAR_ISP_PORT3,
RCAR_ISP_PORT4,
RCAR_ISP_PORT5,
RCAR_ISP_PORT6,
RCAR_ISP_PORT7,
RCAR_ISP_NUM_PADS,
};
struct rcar_isp {
struct device *dev;
void __iomem *base;
struct reset_control *rstc;
enum rcar_isp_input csi_input;
struct v4l2_subdev subdev;
struct media_pad pads[RCAR_ISP_NUM_PADS];
struct v4l2_async_notifier notifier;
struct v4l2_subdev *remote;
struct mutex lock; /* Protects mf and stream_count. */
struct v4l2_mbus_framefmt mf;
int stream_count;
};
static inline struct rcar_isp *sd_to_isp(struct v4l2_subdev *sd)
{
return container_of(sd, struct rcar_isp, subdev);
}
static inline struct rcar_isp *notifier_to_isp(struct v4l2_async_notifier *n)
{
return container_of(n, struct rcar_isp, notifier);
}
static void risp_write(struct rcar_isp *isp, u32 offset, u32 value)
{
iowrite32(value, isp->base + offset);
}
static u32 risp_read(struct rcar_isp *isp, u32 offset)
{
return ioread32(isp->base + offset);
}
static int risp_power_on(struct rcar_isp *isp)
{
int ret;
ret = pm_runtime_resume_and_get(isp->dev);
if (ret < 0)
return ret;
ret = reset_control_deassert(isp->rstc);
if (ret < 0) {
pm_runtime_put(isp->dev);
return ret;
}
return 0;
}
static void risp_power_off(struct rcar_isp *isp)
{
reset_control_assert(isp->rstc);
pm_runtime_put(isp->dev);
}
static int risp_start(struct rcar_isp *isp)
{
const struct rcar_isp_format *format;
unsigned int vc;
u32 sel_csi = 0;
int ret;
format = risp_code_to_fmt(isp->mf.code);
if (!format) {
dev_err(isp->dev, "Unsupported bus format\n");
return -EINVAL;
}
ret = risp_power_on(isp);
if (ret) {
dev_err(isp->dev, "Failed to power on ISP\n");
return ret;
}
/* Select CSI-2 input source. */
if (isp->csi_input == RISP_CSI_INPUT1)
sel_csi = ISPINPUTSEL0_SEL_CSI0;
risp_write(isp, ISPINPUTSEL0_REG,
risp_read(isp, ISPINPUTSEL0_REG) | sel_csi);
/* Configure Channel Selector. */
for (vc = 0; vc < 4; vc++) {
u8 ch = vc + 4;
u8 dt = format->datatype;
risp_write(isp, ISPCS_FILTER_ID_CH_REG(ch), BIT(vc));
risp_write(isp, ISPCS_DT_CODE03_CH_REG(ch),
ISPCS_DT_CODE03_EN3 | ISPCS_DT_CODE03_DT3(dt) |
ISPCS_DT_CODE03_EN2 | ISPCS_DT_CODE03_DT2(dt) |
ISPCS_DT_CODE03_EN1 | ISPCS_DT_CODE03_DT1(dt) |
ISPCS_DT_CODE03_EN0 | ISPCS_DT_CODE03_DT0(dt));
}
/* Setup processing method. */
risp_write(isp, ISPPROCMODE_DT_REG(format->datatype),
ISPPROCMODE_DT_PROC_MODE_VC3(format->procmode) |
ISPPROCMODE_DT_PROC_MODE_VC2(format->procmode) |
ISPPROCMODE_DT_PROC_MODE_VC1(format->procmode) |
ISPPROCMODE_DT_PROC_MODE_VC0(format->procmode));
/* Start ISP. */
risp_write(isp, ISPSTART_REG, ISPSTART_START);
ret = v4l2_subdev_call(isp->remote, video, s_stream, 1);
if (ret)
risp_power_off(isp);
return ret;
}
static void risp_stop(struct rcar_isp *isp)
{
v4l2_subdev_call(isp->remote, video, s_stream, 0);
/* Stop ISP. */
risp_write(isp, ISPSTART_REG, ISPSTART_STOP);
risp_power_off(isp);
}
static int risp_s_stream(struct v4l2_subdev *sd, int enable)
{
struct rcar_isp *isp = sd_to_isp(sd);
int ret = 0;
mutex_lock(&isp->lock);
if (!isp->remote) {
ret = -ENODEV;
goto out;
}
if (enable && isp->stream_count == 0) {
ret = risp_start(isp);
if (ret)
goto out;
} else if (!enable && isp->stream_count == 1) {
risp_stop(isp);
}
isp->stream_count += enable ? 1 : -1;
out:
mutex_unlock(&isp->lock);
return ret;
}
static const struct v4l2_subdev_video_ops risp_video_ops = {
.s_stream = risp_s_stream,
};
static int risp_set_pad_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
{
struct rcar_isp *isp = sd_to_isp(sd);
struct v4l2_mbus_framefmt *framefmt;
mutex_lock(&isp->lock);
if (!risp_code_to_fmt(format->format.code))
format->format.code = rcar_isp_formats[0].code;
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
isp->mf = format->format;
} else {
framefmt = v4l2_subdev_state_get_format(sd_state, 0);
*framefmt = format->format;
}
mutex_unlock(&isp->lock);
return 0;
}
static int risp_get_pad_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
{
struct rcar_isp *isp = sd_to_isp(sd);
mutex_lock(&isp->lock);
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
format->format = isp->mf;
else
format->format = *v4l2_subdev_state_get_format(sd_state, 0);
mutex_unlock(&isp->lock);
return 0;
}
static const struct v4l2_subdev_pad_ops risp_pad_ops = {
.set_fmt = risp_set_pad_format,
.get_fmt = risp_get_pad_format,
.link_validate = v4l2_subdev_link_validate_default,
};
static const struct v4l2_subdev_ops rcar_isp_subdev_ops = {
.video = &risp_video_ops,
.pad = &risp_pad_ops,
};
/* -----------------------------------------------------------------------------
* Async handling and registration of subdevices and links
*/
static int risp_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asd)
{
struct rcar_isp *isp = notifier_to_isp(notifier);
int pad;
pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
MEDIA_PAD_FL_SOURCE);
if (pad < 0) {
dev_err(isp->dev, "Failed to find pad for %s\n", subdev->name);
return pad;
}
isp->remote = subdev;
dev_dbg(isp->dev, "Bound %s pad: %d\n", subdev->name, pad);
return media_create_pad_link(&subdev->entity, pad,
&isp->subdev.entity, 0,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
}
static void risp_notify_unbind(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asd)
{
struct rcar_isp *isp = notifier_to_isp(notifier);
isp->remote = NULL;
dev_dbg(isp->dev, "Unbind %s\n", subdev->name);
}
static const struct v4l2_async_notifier_operations risp_notify_ops = {
.bound = risp_notify_bound,
.unbind = risp_notify_unbind,
};
static int risp_parse_dt(struct rcar_isp *isp)
{
struct v4l2_async_connection *asd;
struct fwnode_handle *fwnode;
struct fwnode_handle *ep;
unsigned int id;
int ret;
for (id = 0; id < 2; id++) {
ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(isp->dev),
0, id, 0);
if (ep)
break;
}
if (!ep) {
dev_err(isp->dev, "Not connected to subdevice\n");
return -EINVAL;
}
if (id == 1)
isp->csi_input = RISP_CSI_INPUT1;
fwnode = fwnode_graph_get_remote_endpoint(ep);
fwnode_handle_put(ep);
dev_dbg(isp->dev, "Found '%pOF'\n", to_of_node(fwnode));
v4l2_async_subdev_nf_init(&isp->notifier, &isp->subdev);
isp->notifier.ops = &risp_notify_ops;
asd = v4l2_async_nf_add_fwnode(&isp->notifier, fwnode,
struct v4l2_async_connection);
fwnode_handle_put(fwnode);
if (IS_ERR(asd))
return PTR_ERR(asd);
ret = v4l2_async_nf_register(&isp->notifier);
if (ret)
v4l2_async_nf_cleanup(&isp->notifier);
return ret;
}
/* -----------------------------------------------------------------------------
* Platform Device Driver
*/
static const struct media_entity_operations risp_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int risp_probe_resources(struct rcar_isp *isp,
struct platform_device *pdev)
{
isp->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
if (IS_ERR(isp->base))
return PTR_ERR(isp->base);
isp->rstc = devm_reset_control_get(&pdev->dev, NULL);
return PTR_ERR_OR_ZERO(isp->rstc);
}
static const struct of_device_id risp_of_id_table[] = {
{ .compatible = "renesas,r8a779a0-isp" },
{ .compatible = "renesas,r8a779g0-isp" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, risp_of_id_table);
static int risp_probe(struct platform_device *pdev)
{
struct rcar_isp *isp;
unsigned int i;
int ret;
isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
if (!isp)
return -ENOMEM;
isp->dev = &pdev->dev;
mutex_init(&isp->lock);
ret = risp_probe_resources(isp, pdev);
if (ret) {
dev_err(isp->dev, "Failed to get resources\n");
goto error_mutex;
}
platform_set_drvdata(pdev, isp);
pm_runtime_enable(&pdev->dev);
ret = risp_parse_dt(isp);
if (ret)
goto error_pm;
isp->subdev.owner = THIS_MODULE;
isp->subdev.dev = &pdev->dev;
v4l2_subdev_init(&isp->subdev, &rcar_isp_subdev_ops);
v4l2_set_subdevdata(&isp->subdev, &pdev->dev);
snprintf(isp->subdev.name, sizeof(isp->subdev.name), "%s %s",
KBUILD_MODNAME, dev_name(&pdev->dev));
isp->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
isp->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
isp->subdev.entity.ops = &risp_entity_ops;
isp->pads[RCAR_ISP_SINK].flags = MEDIA_PAD_FL_SINK;
for (i = RCAR_ISP_PORT0; i < RCAR_ISP_NUM_PADS; i++)
isp->pads[i].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&isp->subdev.entity, RCAR_ISP_NUM_PADS,
isp->pads);
if (ret)
goto error_notifier;
ret = v4l2_async_register_subdev(&isp->subdev);
if (ret < 0)
goto error_notifier;
dev_info(isp->dev, "Using CSI-2 input: %u\n", isp->csi_input);
return 0;
error_notifier:
v4l2_async_nf_unregister(&isp->notifier);
v4l2_async_nf_cleanup(&isp->notifier);
error_pm:
pm_runtime_disable(&pdev->dev);
error_mutex:
mutex_destroy(&isp->lock);
return ret;
}
static void risp_remove(struct platform_device *pdev)
{
struct rcar_isp *isp = platform_get_drvdata(pdev);
v4l2_async_nf_unregister(&isp->notifier);
v4l2_async_nf_cleanup(&isp->notifier);
v4l2_async_unregister_subdev(&isp->subdev);
pm_runtime_disable(&pdev->dev);
mutex_destroy(&isp->lock);
}
static struct platform_driver rcar_isp_driver = {
.driver = {
.name = "rcar-isp",
.suppress_bind_attrs = true,
.of_match_table = risp_of_id_table,
},
.probe = risp_probe,
.remove_new = risp_remove,
};
module_platform_driver(rcar_isp_driver);
MODULE_AUTHOR("Niklas Söderlund <[email protected]>");
MODULE_DESCRIPTION("Renesas R-Car ISP Channel Selector driver");
MODULE_LICENSE("GPL");
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