[PATCH v2 1/8] media: platform: amd: Introduce amd isp4 capture driver

[Bin Du <Bin.Du@amd.com>]

Amd isp4 capture is a v4l2 media device which implements media controller
interface.
It has one sub-device (amd ISP4 sub-device) endpoint which can be connected
to a remote CSI2 TX endpoint. It supports only one physical interface for
now.
Also add ISP4 driver related entry info into the MAINAINERS file

Signed-off-by: Bin Du <Bin.Du@amd.com>
Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@amd.com>
---
 MAINTAINERS                              |  10 ++
 drivers/media/platform/Kconfig           |   1 +
 drivers/media/platform/Makefile          |   1 +
 drivers/media/platform/amd/Kconfig       |  17 +++
 drivers/media/platform/amd/Makefile      |   5 +
 drivers/media/platform/amd/isp4/Makefile |  21 ++++
 drivers/media/platform/amd/isp4/isp4.c   | 139 +++++++++++++++++++++++
 drivers/media/platform/amd/isp4/isp4.h   |  35 ++++++
 8 files changed, 229 insertions(+)
 create mode 100644 drivers/media/platform/amd/Kconfig
 create mode 100644 drivers/media/platform/amd/Makefile
 create mode 100644 drivers/media/platform/amd/isp4/Makefile
 create mode 100644 drivers/media/platform/amd/isp4/isp4.c
 create mode 100644 drivers/media/platform/amd/isp4/isp4.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 10893c91b1c1..15070afb14b5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1107,6 +1107,16 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux.git
 F:	drivers/iommu/amd/
 F:	include/linux/amd-iommu.h
 
+AMD ISP4 DRIVER
+M:	Bin Du <bin.du@amd.com>
+M:	Nirujogi Pratap <pratap.nirujogi@amd.com>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+T:	git git://linuxtv.org/media.git
+F:	drivers/media/platform/amd/Kconfig
+F:	drivers/media/platform/amd/Makefile
+F:	drivers/media/platform/amd/isp4/*
+
 AMD KFD
 M:	Felix Kuehling <Felix.Kuehling@amd.com>
 L:	amd-gfx@lists.freedesktop.org
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 85d2627776b6..d525c2262a7d 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -89,5 +89,6 @@ source "drivers/media/platform/ti/Kconfig"
 source "drivers/media/platform/verisilicon/Kconfig"
 source "drivers/media/platform/via/Kconfig"
 source "drivers/media/platform/xilinx/Kconfig"
+source "drivers/media/platform/amd/Kconfig"
 
 endif # MEDIA_PLATFORM_DRIVERS
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index ace4e34483dd..9f3d1693868d 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -32,6 +32,7 @@ obj-y += ti/
 obj-y += verisilicon/
 obj-y += via/
 obj-y += xilinx/
+obj-y += amd/
 
 # Please place here only ancillary drivers that aren't SoC-specific
 # Please keep it alphabetically sorted by Kconfig name
diff --git a/drivers/media/platform/amd/Kconfig b/drivers/media/platform/amd/Kconfig
new file mode 100644
index 000000000000..3b1dba0400a0
--- /dev/null
+++ b/drivers/media/platform/amd/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: MIT
+
+config AMD_ISP4
+	tristate "AMD ISP4 and camera driver"
+	default y
+	depends on VIDEO_DEV && VIDEO_V4L2_SUBDEV_API
+	select VIDEOBUF2_CORE
+	select VIDEOBUF2_V4L2
+	select VIDEOBUF2_MEMOPS
+	select VIDEOBUF2_VMALLOC
+	select VIDEOBUF2_DMA_CONTIG
+	select VIDEOBUF2_DMA_SG
+	help
+	  This is support for AMD ISP4 and camera subsystem driver.
+	  Say Y here to enable the ISP4 and camera device for video capture.
+	  To compile this driver as a module, choose M here. The module will
+	  be called amd_capture.
diff --git a/drivers/media/platform/amd/Makefile b/drivers/media/platform/amd/Makefile
new file mode 100644
index 000000000000..76146efcd2bf
--- /dev/null
+++ b/drivers/media/platform/amd/Makefile
@@ -0,0 +1,5 @@
+# Copyright 2024 Advanced Micro Devices, Inc.
+# add isp block
+ifneq ($(CONFIG_AMD_ISP4),)
+obj-y += isp4/
+endif
diff --git a/drivers/media/platform/amd/isp4/Makefile b/drivers/media/platform/amd/isp4/Makefile
new file mode 100644
index 000000000000..e9e84160517d
--- /dev/null
+++ b/drivers/media/platform/amd/isp4/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2025 Advanced Micro Devices, Inc.
+
+obj-$(CONFIG_AMD_ISP4) += amd_capture.o
+amd_capture-objs := isp4.o
+
+ccflags-y += -I$(srctree)/drivers/media/platform/amd/isp4
+ccflags-y += -I$(srctree)/include
+
+ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
+	cc_stack_align := -mpreferred-stack-boundary=4
+endif
+
+ccflags-y += $(cc_stack_align)
+ccflags-y += -DCONFIG_COMPAT
+ccflags-y += -Wunused-but-set-variable
+ccflags-y += -Wmissing-include-dirs
+ccflags-y += -Wunused-const-variable
+ccflags-y += -Wmaybe-uninitialized
+ccflags-y += -Wunused-value
diff --git a/drivers/media/platform/amd/isp4/isp4.c b/drivers/media/platform/amd/isp4/isp4.c
new file mode 100644
index 000000000000..d0be90c5ec3b
--- /dev/null
+++ b/drivers/media/platform/amd/isp4/isp4.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/pm_runtime.h>
+#include <linux/vmalloc.h>
+#include <media/v4l2-ioctl.h>
+
+#include "isp4.h"
+
+#define VIDEO_BUF_NUM 5
+
+#define ISP4_DRV_NAME "amd_isp_capture"
+
+/* interrupt num */
+static const u32 isp4_ringbuf_interrupt_num[] = {
+	0, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT9 */
+	1, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT10 */
+	3, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT11 */
+	4, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT12 */
+};
+
+#define to_isp4_device(dev) \
+	((struct isp4_device *)container_of(dev, struct isp4_device, v4l2_dev))
+
+static irqreturn_t isp4_irq_handler(int irq, void *arg)
+{
+	struct isp4_device *isp_dev = dev_get_drvdata((struct device *)arg);
+
+	if (!isp_dev)
+		goto error_drv_data;
+
+error_drv_data:
+	return IRQ_HANDLED;
+}
+
+/*
+ * amd capture module
+ */
+static int isp4_capture_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct isp4_device *isp_dev;
+
+	int i, irq, ret;
+
+	isp_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_dev), GFP_KERNEL);
+	if (!isp_dev)
+		return -ENOMEM;
+
+	isp_dev->pdev = pdev;
+	dev->init_name = ISP4_DRV_NAME;
+
+	for (i = 0; i < ARRAY_SIZE(isp4_ringbuf_interrupt_num); i++) {
+		irq = platform_get_irq(pdev, isp4_ringbuf_interrupt_num[i]);
+		if (irq < 0)
+			return dev_err_probe(dev, -ENODEV,
+					     "fail to get irq %d\n",
+					     isp4_ringbuf_interrupt_num[i]);
+		ret = devm_request_irq(&pdev->dev, irq, isp4_irq_handler, 0,
+				       "ISP_IRQ", &pdev->dev);
+		if (ret)
+			return dev_err_probe(dev, ret, "fail to req irq %d\n",
+					     irq);
+	}
+
+	isp_dev->pltf_data = pdev->dev.platform_data;
+
+	dev_dbg(dev, "isp irq registration successful\n");
+
+	/* Link the media device within the v4l2_device */
+	isp_dev->v4l2_dev.mdev = &isp_dev->mdev;
+
+	/* Initialize media device */
+	strscpy(isp_dev->mdev.model, "amd_isp41_mdev",
+		sizeof(isp_dev->mdev.model));
+	snprintf(isp_dev->mdev.bus_info, sizeof(isp_dev->mdev.bus_info),
+		 "platform:%s", ISP4_DRV_NAME);
+	isp_dev->mdev.dev = &pdev->dev;
+	media_device_init(&isp_dev->mdev);
+
+	/* register v4l2 device */
+	snprintf(isp_dev->v4l2_dev.name, sizeof(isp_dev->v4l2_dev.name),
+		 "AMD-V4L2-ROOT");
+	ret = v4l2_device_register(&pdev->dev, &isp_dev->v4l2_dev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "fail register v4l2 device\n");
+
+	dev_dbg(dev, "AMD ISP v4l2 device registered\n");
+
+	ret = media_device_register(&isp_dev->mdev);
+	if (ret) {
+		dev_err(dev, "fail to register media device %d\n", ret);
+		goto err_unreg_v4l2;
+	}
+
+	platform_set_drvdata(pdev, isp_dev);
+
+	pm_runtime_set_suspended(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+
+err_unreg_v4l2:
+	v4l2_device_unregister(&isp_dev->v4l2_dev);
+
+	return dev_err_probe(dev, ret, "isp probe fail\n");
+}
+
+static void isp4_capture_remove(struct platform_device *pdev)
+{
+	struct isp4_device *isp_dev = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	media_device_unregister(&isp_dev->mdev);
+	v4l2_device_unregister(&isp_dev->v4l2_dev);
+	dev_dbg(dev, "AMD ISP v4l2 device unregistered\n");
+}
+
+static struct platform_driver isp4_capture_drv = {
+	.probe = isp4_capture_probe,
+	.remove = isp4_capture_remove,
+	.driver = {
+		.name = ISP4_DRV_NAME,
+		.owner = THIS_MODULE,
+	}
+};
+
+module_platform_driver(isp4_capture_drv);
+
+MODULE_ALIAS("platform:" ISP4_DRV_NAME);
+MODULE_IMPORT_NS("DMA_BUF");
+
+MODULE_DESCRIPTION("AMD ISP4 Driver");
+MODULE_AUTHOR("Bin Du <bin.du@amd.com>");
+MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@amd.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/amd/isp4/isp4.h b/drivers/media/platform/amd/isp4/isp4.h
new file mode 100644
index 000000000000..27a7362ce6f9
--- /dev/null
+++ b/drivers/media/platform/amd/isp4/isp4.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#ifndef _ISP4_H_
+#define _ISP4_H_
+
+#include <linux/mutex.h>
+#include <media/v4l2-device.h>
+#include <media/videobuf2-memops.h>
+#include <media/videobuf2-vmalloc.h>
+
+#define ISP4_GET_ISP_REG_BASE(isp4sd) (((isp4sd))->mmio)
+
+struct isp4_platform_data {
+	void *adev;
+	void *bo;
+	void *cpu_ptr;
+	u64 gpu_addr;
+	u32 size;
+	u32 asic_type;
+	resource_size_t base_rmmio_size;
+};
+
+struct isp4_device {
+	struct v4l2_device v4l2_dev;
+	struct media_device mdev;
+
+	struct isp4_platform_data *pltf_data;
+	struct platform_device *pdev;
+	struct notifier_block i2c_nb;
+};
+
+#endif /* isp4.h */
-- 
2.34.1