// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
* Author: Yong Deng <[email protected]>
* Copyright 2021-2022 Bootlin
* Author: Paul Kocialkowski <[email protected]>
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mc.h>
#include "sun6i_csi.h"
#include "sun6i_csi_bridge.h"
#include "sun6i_csi_capture.h"
#include "sun6i_csi_reg.h"
/* ISP */
int sun6i_csi_isp_complete(struct sun6i_csi_device *csi_dev,
struct v4l2_device *v4l2_dev)
{
if (csi_dev->v4l2_dev && csi_dev->v4l2_dev != v4l2_dev)
return -EINVAL;
csi_dev->v4l2_dev = v4l2_dev;
csi_dev->media_dev = v4l2_dev->mdev;
return sun6i_csi_capture_setup(csi_dev);
}
static int sun6i_csi_isp_detect(struct sun6i_csi_device *csi_dev)
{
struct device *dev = csi_dev->dev;
struct fwnode_handle *handle;
/*
* ISP is not available if not connected via fwnode graph.
* This will also check that the remote parent node is available.
*/
handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
SUN6I_CSI_PORT_ISP, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!handle)
return 0;
fwnode_handle_put(handle);
if (!IS_ENABLED(CONFIG_VIDEO_SUN6I_ISP)) {
dev_warn(dev,
"ISP link is detected but not enabled in kernel config!");
return 0;
}
csi_dev->isp_available = true;
return 0;
}
/* Media */
static const struct media_device_ops sun6i_csi_media_ops = {
.link_notify = v4l2_pipeline_link_notify,
};
/* V4L2 */
static int sun6i_csi_v4l2_setup(struct sun6i_csi_device *csi_dev)
{
struct sun6i_csi_v4l2 *v4l2 = &csi_dev->v4l2;
struct media_device *media_dev = &v4l2->media_dev;
struct v4l2_device *v4l2_dev = &v4l2->v4l2_dev;
struct device *dev = csi_dev->dev;
int ret;
/* Media Device */
strscpy(media_dev->model, SUN6I_CSI_DESCRIPTION,
sizeof(media_dev->model));
media_dev->hw_revision = 0;
media_dev->ops = &sun6i_csi_media_ops;
media_dev->dev = dev;
media_device_init(media_dev);
ret = media_device_register(media_dev);
if (ret) {
dev_err(dev, "failed to register media device: %d\n", ret);
goto error_media;
}
/* V4L2 Device */
v4l2_dev->mdev = media_dev;
ret = v4l2_device_register(dev, v4l2_dev);
if (ret) {
dev_err(dev, "failed to register v4l2 device: %d\n", ret);
goto error_media;
}
csi_dev->v4l2_dev = v4l2_dev;
csi_dev->media_dev = media_dev;
return 0;
error_media:
media_device_unregister(media_dev);
media_device_cleanup(media_dev);
return ret;
}
static void sun6i_csi_v4l2_cleanup(struct sun6i_csi_device *csi_dev)
{
struct sun6i_csi_v4l2 *v4l2 = &csi_dev->v4l2;
media_device_unregister(&v4l2->media_dev);
v4l2_device_unregister(&v4l2->v4l2_dev);
media_device_cleanup(&v4l2->media_dev);
}
/* Platform */
static irqreturn_t sun6i_csi_interrupt(int irq, void *private)
{
struct sun6i_csi_device *csi_dev = private;
bool capture_streaming = csi_dev->capture.state.streaming;
struct regmap *regmap = csi_dev->regmap;
u32 status = 0, enable = 0;
regmap_read(regmap, SUN6I_CSI_CH_INT_STA_REG, &status);
regmap_read(regmap, SUN6I_CSI_CH_INT_EN_REG, &enable);
if (!status)
return IRQ_NONE;
else if (!(status & enable) || !capture_streaming)
goto complete;
if ((status & SUN6I_CSI_CH_INT_STA_FIFO0_OF) ||
(status & SUN6I_CSI_CH_INT_STA_FIFO1_OF) ||
(status & SUN6I_CSI_CH_INT_STA_FIFO2_OF) ||
(status & SUN6I_CSI_CH_INT_STA_HB_OF)) {
regmap_write(regmap, SUN6I_CSI_CH_INT_STA_REG, status);
regmap_update_bits(regmap, SUN6I_CSI_EN_REG,
SUN6I_CSI_EN_CSI_EN, 0);
regmap_update_bits(regmap, SUN6I_CSI_EN_REG,
SUN6I_CSI_EN_CSI_EN, SUN6I_CSI_EN_CSI_EN);
return IRQ_HANDLED;
}
if (status & SUN6I_CSI_CH_INT_STA_FD)
sun6i_csi_capture_frame_done(csi_dev);
if (status & SUN6I_CSI_CH_INT_STA_VS)
sun6i_csi_capture_sync(csi_dev);
complete:
regmap_write(regmap, SUN6I_CSI_CH_INT_STA_REG, status);
return IRQ_HANDLED;
}
static int sun6i_csi_suspend(struct device *dev)
{
struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev);
reset_control_assert(csi_dev->reset);
clk_disable_unprepare(csi_dev->clock_ram);
clk_disable_unprepare(csi_dev->clock_mod);
return 0;
}
static int sun6i_csi_resume(struct device *dev)
{
struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev);
int ret;
ret = reset_control_deassert(csi_dev->reset);
if (ret) {
dev_err(dev, "failed to deassert reset\n");
return ret;
}
ret = clk_prepare_enable(csi_dev->clock_mod);
if (ret) {
dev_err(dev, "failed to enable module clock\n");
goto error_reset;
}
ret = clk_prepare_enable(csi_dev->clock_ram);
if (ret) {
dev_err(dev, "failed to enable ram clock\n");
goto error_clock_mod;
}
return 0;
error_clock_mod:
clk_disable_unprepare(csi_dev->clock_mod);
error_reset:
reset_control_assert(csi_dev->reset);
return ret;
}
static const struct dev_pm_ops sun6i_csi_pm_ops = {
.runtime_suspend = sun6i_csi_suspend,
.runtime_resume = sun6i_csi_resume,
};
static const struct regmap_config sun6i_csi_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x9c,
};
static int sun6i_csi_resources_setup(struct sun6i_csi_device *csi_dev,
struct platform_device *platform_dev)
{
struct device *dev = csi_dev->dev;
const struct sun6i_csi_variant *variant;
void __iomem *io_base;
int ret;
int irq;
variant = of_device_get_match_data(dev);
if (!variant)
return -EINVAL;
/* Registers */
io_base = devm_platform_ioremap_resource(platform_dev, 0);
if (IS_ERR(io_base))
return PTR_ERR(io_base);
csi_dev->regmap = devm_regmap_init_mmio_clk(dev, "bus", io_base,
&sun6i_csi_regmap_config);
if (IS_ERR(csi_dev->regmap)) {
dev_err(dev, "failed to init register map\n");
return PTR_ERR(csi_dev->regmap);
}
/* Clocks */
csi_dev->clock_mod = devm_clk_get(dev, "mod");
if (IS_ERR(csi_dev->clock_mod)) {
dev_err(dev, "failed to acquire module clock\n");
return PTR_ERR(csi_dev->clock_mod);
}
csi_dev->clock_ram = devm_clk_get(dev, "ram");
if (IS_ERR(csi_dev->clock_ram)) {
dev_err(dev, "failed to acquire ram clock\n");
return PTR_ERR(csi_dev->clock_ram);
}
ret = clk_set_rate_exclusive(csi_dev->clock_mod,
variant->clock_mod_rate);
if (ret) {
dev_err(dev, "failed to set mod clock rate\n");
return ret;
}
/* Reset */
csi_dev->reset = devm_reset_control_get_shared(dev, NULL);
if (IS_ERR(csi_dev->reset)) {
dev_err(dev, "failed to acquire reset\n");
ret = PTR_ERR(csi_dev->reset);
goto error_clock_rate_exclusive;
}
/* Interrupt */
irq = platform_get_irq(platform_dev, 0);
if (irq < 0) {
ret = -ENXIO;
goto error_clock_rate_exclusive;
}
ret = devm_request_irq(dev, irq, sun6i_csi_interrupt, IRQF_SHARED,
SUN6I_CSI_NAME, csi_dev);
if (ret) {
dev_err(dev, "failed to request interrupt\n");
goto error_clock_rate_exclusive;
}
/* Runtime PM */
pm_runtime_enable(dev);
return 0;
error_clock_rate_exclusive:
clk_rate_exclusive_put(csi_dev->clock_mod);
return ret;
}
static void sun6i_csi_resources_cleanup(struct sun6i_csi_device *csi_dev)
{
pm_runtime_disable(csi_dev->dev);
clk_rate_exclusive_put(csi_dev->clock_mod);
}
static int sun6i_csi_probe(struct platform_device *platform_dev)
{
struct sun6i_csi_device *csi_dev;
struct device *dev = &platform_dev->dev;
int ret;
csi_dev = devm_kzalloc(dev, sizeof(*csi_dev), GFP_KERNEL);
if (!csi_dev)
return -ENOMEM;
csi_dev->dev = &platform_dev->dev;
platform_set_drvdata(platform_dev, csi_dev);
ret = sun6i_csi_resources_setup(csi_dev, platform_dev);
if (ret)
return ret;
ret = sun6i_csi_isp_detect(csi_dev);
if (ret)
goto error_resources;
/*
* Register our own v4l2 and media devices when there is no ISP around.
* Otherwise the ISP will use async subdev registration with our bridge,
* which will provide v4l2 and media devices that are used to register
* the video interface.
*/
if (!csi_dev->isp_available) {
ret = sun6i_csi_v4l2_setup(csi_dev);
if (ret)
goto error_resources;
}
ret = sun6i_csi_bridge_setup(csi_dev);
if (ret)
goto error_v4l2;
if (!csi_dev->isp_available) {
ret = sun6i_csi_capture_setup(csi_dev);
if (ret)
goto error_bridge;
}
return 0;
error_bridge:
sun6i_csi_bridge_cleanup(csi_dev);
error_v4l2:
if (!csi_dev->isp_available)
sun6i_csi_v4l2_cleanup(csi_dev);
error_resources:
sun6i_csi_resources_cleanup(csi_dev);
return ret;
}
static void sun6i_csi_remove(struct platform_device *pdev)
{
struct sun6i_csi_device *csi_dev = platform_get_drvdata(pdev);
sun6i_csi_capture_cleanup(csi_dev);
sun6i_csi_bridge_cleanup(csi_dev);
if (!csi_dev->isp_available)
sun6i_csi_v4l2_cleanup(csi_dev);
sun6i_csi_resources_cleanup(csi_dev);
}
static const struct sun6i_csi_variant sun6i_a31_csi_variant = {
.clock_mod_rate = 297000000,
};
static const struct sun6i_csi_variant sun50i_a64_csi_variant = {
.clock_mod_rate = 300000000,
};
static const struct of_device_id sun6i_csi_of_match[] = {
{
.compatible = "allwinner,sun6i-a31-csi",
.data = &sun6i_a31_csi_variant,
},
{
.compatible = "allwinner,sun8i-a83t-csi",
.data = &sun6i_a31_csi_variant,
},
{
.compatible = "allwinner,sun8i-h3-csi",
.data = &sun6i_a31_csi_variant,
},
{
.compatible = "allwinner,sun8i-v3s-csi",
.data = &sun6i_a31_csi_variant,
},
{
.compatible = "allwinner,sun50i-a64-csi",
.data = &sun50i_a64_csi_variant,
},
{},
};
MODULE_DEVICE_TABLE(of, sun6i_csi_of_match);
static struct platform_driver sun6i_csi_platform_driver = {
.probe = sun6i_csi_probe,
.remove_new = sun6i_csi_remove,
.driver = {
.name = SUN6I_CSI_NAME,
.of_match_table = sun6i_csi_of_match,
.pm = &sun6i_csi_pm_ops,
},
};
module_platform_driver(sun6i_csi_platform_driver);
MODULE_DESCRIPTION("Allwinner A31 Camera Sensor Interface driver");
MODULE_AUTHOR("Yong Deng <[email protected]>");
MODULE_AUTHOR("Paul Kocialkowski <[email protected]>");
MODULE_LICENSE("GPL");
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