Add msi support for Broadcom platform devices

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
---
 drivers/vfio/platform/Kconfig                 |  1 +
 drivers/vfio/platform/Makefile                |  1 +
 drivers/vfio/platform/msi/Kconfig             |  9 ++++
 drivers/vfio/platform/msi/Makefile            |  2 +
 .../vfio/platform/msi/vfio_platform_bcmplt.c  | 49 +++++++++++++++++++
 5 files changed, 62 insertions(+)
 create mode 100644 drivers/vfio/platform/msi/Kconfig
 create mode 100644 drivers/vfio/platform/msi/Makefile
 create mode 100644 drivers/vfio/platform/msi/vfio_platform_bcmplt.c

diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
index dc1a3c44f2c6..7b8696febe61 100644
--- a/drivers/vfio/platform/Kconfig
+++ b/drivers/vfio/platform/Kconfig
@@ -21,3 +21,4 @@ config VFIO_AMBA
 	  If you don't know what to do here, say N.
 
 source "drivers/vfio/platform/reset/Kconfig"
+source "drivers/vfio/platform/msi/Kconfig"
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
index 3f3a24e7c4ef..9ccdcdbf0e7e 100644
--- a/drivers/vfio/platform/Makefile
+++ b/drivers/vfio/platform/Makefile
@@ -5,6 +5,7 @@ vfio-platform-y := vfio_platform.o
 obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
 obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform-base.o
 obj-$(CONFIG_VFIO_PLATFORM) += reset/
+obj-$(CONFIG_VFIO_PLATFORM) += msi/
 
 vfio-amba-y := vfio_amba.o
 
diff --git a/drivers/vfio/platform/msi/Kconfig b/drivers/vfio/platform/msi/Kconfig
new file mode 100644
index 000000000000..54d6b70e1e32
--- /dev/null
+++ b/drivers/vfio/platform/msi/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config VFIO_PLATFORM_BCMPLT_MSI
+	tristate "MSI support for Broadcom platform devices"
+	depends on VFIO_PLATFORM && (ARCH_BCM_IPROC || COMPILE_TEST)
+	default ARCH_BCM_IPROC
+	help
+	  Enables the VFIO platform driver to handle msi for Broadcom devices
+
+	  If you don't know what to do here, say N.
diff --git a/drivers/vfio/platform/msi/Makefile b/drivers/vfio/platform/msi/Makefile
new file mode 100644
index 000000000000..27422d45cecb
--- /dev/null
+++ b/drivers/vfio/platform/msi/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_VFIO_PLATFORM_BCMPLT_MSI) += vfio_platform_bcmplt.o
diff --git a/drivers/vfio/platform/msi/vfio_platform_bcmplt.c b/drivers/vfio/platform/msi/vfio_platform_bcmplt.c
new file mode 100644
index 000000000000..a074b5e92d77
--- /dev/null
+++ b/drivers/vfio/platform/msi/vfio_platform_bcmplt.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Broadcom.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/msi.h>
+#include <linux/vfio.h>
+
+#include "../vfio_platform_private.h"
+
+#define RING_SIZE		(64 << 10)
+
+#define RING_MSI_ADDR_LS	0x03c
+#define RING_MSI_ADDR_MS	0x040
+#define RING_MSI_DATA_VALUE	0x064
+
+static u32 bcm_num_msi(struct vfio_platform_device *vdev)
+{
+	struct vfio_platform_region *reg = &vdev->regions[0];
+
+	return (reg->size / RING_SIZE);
+}
+
+static struct vfio_platform_msi_node vfio_platform_bcmflexrm_msi_node = {
+	.owner = THIS_MODULE,
+	.compat = "brcm,iproc-flexrm-mbox",
+	.of_get_msi = bcm_num_msi,
+};
+
+static int __init vfio_platform_bcmflexrm_msi_module_init(void)
+{
+	__vfio_platform_register_msi(&vfio_platform_bcmflexrm_msi_node);
+
+	return 0;
+}
+
+static void __exit vfio_platform_bcmflexrm_msi_module_exit(void)
+{
+	vfio_platform_unregister_msi("brcm,iproc-flexrm-mbox");
+}
+
+module_init(vfio_platform_bcmflexrm_msi_module_init);
+module_exit(vfio_platform_bcmflexrm_msi_module_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Broadcom");
-- 
2.17.1


-- 
This electronic communication and the information and any files transmitted 
with it, or attached to it, are confidential and are intended solely for 
the use of the individual or entity to whom it is addressed and may contain 
information that is confidential, legally privileged, protected by privacy 
laws, or otherwise restricted from disclosure to anyone else. If you are 
not the intended recipient or the person responsible for delivering the 
e-mail to the intended recipient, you are hereby notified that any use, 
copying, distributing, dissemination, forwarding, printing, or copying of 
this e-mail is strictly prohibited. If you received this e-mail in error, 
please return the e-mail to the sender, delete it from your computer, and 
destroy any printed copy of it.