[PATCH v3 03/29] media: iris: add platform driver for iris video device

[Dikshita Agarwal via B4 Relay <devnull+quic_dikshita.quicinc.com@kernel.org>]

From: Dikshita Agarwal <quic_dikshita@quicinc.com>

In preparation of adding H264 decode functionality,
add probe and remove functions to iris video platform driver.

Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
---
 drivers/media/platform/qcom/Kconfig           |   1 +
 drivers/media/platform/qcom/Makefile          |   1 +
 drivers/media/platform/qcom/iris/Kconfig      |   9 +++
 drivers/media/platform/qcom/iris/Makefile     |   3 +
 drivers/media/platform/qcom/iris/iris_core.h  |  29 +++++++
 drivers/media/platform/qcom/iris/iris_probe.c | 108 ++++++++++++++++++++++++++
 6 files changed, 151 insertions(+)

diff --git a/drivers/media/platform/qcom/Kconfig b/drivers/media/platform/qcom/Kconfig
index cc5799b9ea00..4f4d3a68e6e5 100644
--- a/drivers/media/platform/qcom/Kconfig
+++ b/drivers/media/platform/qcom/Kconfig
@@ -3,4 +3,5 @@
 comment "Qualcomm media platform drivers"
 
 source "drivers/media/platform/qcom/camss/Kconfig"
+source "drivers/media/platform/qcom/iris/Kconfig"
 source "drivers/media/platform/qcom/venus/Kconfig"
diff --git a/drivers/media/platform/qcom/Makefile b/drivers/media/platform/qcom/Makefile
index 4f055c396e04..ea2221a202c0 100644
--- a/drivers/media/platform/qcom/Makefile
+++ b/drivers/media/platform/qcom/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-y += camss/
+obj-y += iris/
 obj-y += venus/
diff --git a/drivers/media/platform/qcom/iris/Kconfig b/drivers/media/platform/qcom/iris/Kconfig
new file mode 100644
index 000000000000..a9986aaa448d
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/Kconfig
@@ -0,0 +1,9 @@
+config VIDEO_QCOM_IRIS
+        tristate "Qualcomm Iris V4L2 decoder driver"
+        depends on VIDEO_DEV
+        depends on ARCH_QCOM || COMPILE_TEST
+        help
+          This is a V4L2 driver for Qualcomm Iris video accelerator
+          hardware. It accelerates decoding operations on various
+          Qualcomm SoCs.
+          To compile this driver as a module choose m here.
diff --git a/drivers/media/platform/qcom/iris/Makefile b/drivers/media/platform/qcom/iris/Makefile
new file mode 100644
index 000000000000..913da225486b
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/Makefile
@@ -0,0 +1,3 @@
+iris-objs += iris_probe.o \
+
+obj-$(CONFIG_VIDEO_QCOM_IRIS) += iris.o
diff --git a/drivers/media/platform/qcom/iris/iris_core.h b/drivers/media/platform/qcom/iris/iris_core.h
new file mode 100644
index 000000000000..402f0aaef995
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/iris_core.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _IRIS_CORE_H_
+#define _IRIS_CORE_H_
+
+#include <media/v4l2-device.h>
+
+/**
+ * struct iris_core - holds core parameters valid for all instances
+ *
+ * @dev: reference to device structure
+ * @reg_base: IO memory base address
+ * @irq: iris irq
+ * @v4l2_dev: a holder for v4l2 device structure
+ * @vdev_dec: iris video device structure for decoder
+ */
+
+struct iris_core {
+	struct device				*dev;
+	void __iomem				*reg_base;
+	int					irq;
+	struct v4l2_device			v4l2_dev;
+	struct video_device			*vdev_dec;
+};
+
+#endif
diff --git a/drivers/media/platform/qcom/iris/iris_probe.c b/drivers/media/platform/qcom/iris/iris_probe.c
new file mode 100644
index 000000000000..0a54fdaa1ab5
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/iris_probe.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/module.h>
+
+#include "iris_core.h"
+
+static int iris_register_video_device(struct iris_core *core)
+{
+	struct video_device *vdev;
+	int ret;
+
+	vdev = video_device_alloc();
+	if (!vdev)
+		return -ENOMEM;
+
+	strscpy(vdev->name, "qcom-iris-decoder", sizeof(vdev->name));
+	vdev->release = video_device_release;
+	vdev->vfl_dir = VFL_DIR_M2M;
+	vdev->v4l2_dev = &core->v4l2_dev;
+	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
+
+	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
+	if (ret)
+		goto err_vdev_release;
+
+	core->vdev_dec = vdev;
+	video_set_drvdata(vdev, core);
+
+	return 0;
+
+err_vdev_release:
+	video_device_release(vdev);
+
+	return ret;
+}
+
+static void iris_remove(struct platform_device *pdev)
+{
+	struct iris_core *core;
+
+	core = platform_get_drvdata(pdev);
+	if (!core)
+		return;
+
+	video_unregister_device(core->vdev_dec);
+
+	v4l2_device_unregister(&core->v4l2_dev);
+}
+
+static int iris_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iris_core *core;
+	int ret;
+
+	core = devm_kzalloc(&pdev->dev, sizeof(*core), GFP_KERNEL);
+	if (!core)
+		return -ENOMEM;
+	core->dev = dev;
+
+	core->reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(core->reg_base))
+		return PTR_ERR(core->reg_base);
+
+	core->irq = platform_get_irq(pdev, 0);
+	if (core->irq < 0)
+		return core->irq;
+
+	ret = v4l2_device_register(dev, &core->v4l2_dev);
+	if (ret)
+		return ret;
+
+	ret = iris_register_video_device(core);
+	if (ret)
+		goto err_v4l2_unreg;
+
+	platform_set_drvdata(pdev, core);
+
+	return 0;
+
+err_v4l2_unreg:
+	v4l2_device_unregister(&core->v4l2_dev);
+
+	return ret;
+}
+
+static const struct of_device_id iris_dt_match[] = {
+	{ .compatible = "qcom,sm8550-iris", },
+	{ .compatible = "qcom,sm8250-venus", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, iris_dt_match);
+
+static struct platform_driver qcom_iris_driver = {
+	.probe = iris_probe,
+	.remove_new = iris_remove,
+	.driver = {
+		.name = "qcom-iris",
+		.of_match_table = iris_dt_match,
+	},
+};
+
+module_platform_driver(qcom_iris_driver);
+MODULE_DESCRIPTION("Qualcomm Iris video driver");
+MODULE_LICENSE("GPL");

-- 
2.34.1