1 files changed, 439 insertions, 0 deletions

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
new file mode 100644
index 0000000000..c6ba385c0c
--- /dev/null
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
+ * Author: Yong Deng <yong.deng@magewell.com>
+ * Copyright 2021-2022 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#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 <yong.deng@magewell.com>");
+MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
+MODULE_LICENSE("GPL");