octeontx2-af: Add Marvell OcteonTX2 RVU AF driver

This patch adds basic template for Marvell OcteonTX2's
resource virtualization unit (RVU) admin function (AF)
driver. Just the driver registration and probe.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/Kconfig

@@ -167,4 +167,7 @@ config SKY2_DEBUG
 
 	  If unsure, say N.
 
+
+source "drivers/net/ethernet/marvell/octeontx2/Kconfig"
+
 endif # NET_VENDOR_MARVELL

drivers/net/ethernet/marvell/Makefile

@@ -11,3 +11,4 @@ obj-$(CONFIG_MVPP2) += mvpp2/
 obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
 obj-$(CONFIG_SKGE) += skge.o
 obj-$(CONFIG_SKY2) += sky2.o
+obj-y		+= octeontx2/

drivers/net/ethernet/marvell/octeontx2/Kconfig

@@ -0,0 +1,13 @@
+#
+# Marvell OcteonTX2 drivers configuration
+#
+
+config OCTEONTX2_AF
+	tristate "Marvell OcteonTX2 RVU Admin Function driver"
+	depends on (64BIT && COMPILE_TEST) || ARM64
+	depends on PCI
+	help
+	  This driver supports Marvell's OcteonTX2 Resource Virtualization
+	  Unit's admin function manager which manages all RVU HW resources
+	  and provides a medium to other PF/VFs to configure HW. Should be
+	  enabled for other RVU device drivers to work.

drivers/net/ethernet/marvell/octeontx2/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Marvell OcteonTX2 device drivers.
+#
+
+obj-$(CONFIG_OCTEONTX2_AF) += af/

drivers/net/ethernet/marvell/octeontx2/af/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Marvell's OcteonTX2 RVU Admin Function driver
+#
+
+obj-$(CONFIG_OCTEONTX2_AF) += octeontx2_af.o
+
+octeontx2_af-y := rvu.o

drivers/net/ethernet/marvell/octeontx2/af/rvu.c

@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/pci.h>
+#include <linux/sysfs.h>
+
+#include "rvu.h"
+
+#define DRV_NAME	"octeontx2-af"
+#define DRV_STRING      "Marvell OcteonTX2 RVU Admin Function Driver"
+#define DRV_VERSION	"1.0"
+
+/* Supported devices */
+static const struct pci_device_id rvu_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_OCTEONTX2_RVU_AF) },
+	{ 0, }  /* end of table */
+};
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION(DRV_STRING);
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, rvu_id_table);
+
+static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct rvu *rvu;
+	int    err;
+
+	rvu = devm_kzalloc(dev, sizeof(*rvu), GFP_KERNEL);
+	if (!rvu)
+		return -ENOMEM;
+
+	pci_set_drvdata(pdev, rvu);
+	rvu->pdev = pdev;
+	rvu->dev = &pdev->dev;
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(dev, "Failed to enable PCI device\n");
+		goto err_freemem;
+	}
+
+	err = pci_request_regions(pdev, DRV_NAME);
+	if (err) {
+		dev_err(dev, "PCI request regions failed 0x%x\n", err);
+		goto err_disable_device;
+	}
+
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48));
+	if (err) {
+		dev_err(dev, "Unable to set DMA mask\n");
+		goto err_release_regions;
+	}
+
+	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48));
+	if (err) {
+		dev_err(dev, "Unable to set consistent DMA mask\n");
+		goto err_release_regions;
+	}
+
+	/* Map Admin function CSRs */
+	rvu->afreg_base = pcim_iomap(pdev, PCI_AF_REG_BAR_NUM, 0);
+	rvu->pfreg_base = pcim_iomap(pdev, PCI_PF_REG_BAR_NUM, 0);
+	if (!rvu->afreg_base || !rvu->pfreg_base) {
+		dev_err(dev, "Unable to map admin function CSRs, aborting\n");
+		err = -ENOMEM;
+		goto err_release_regions;
+	}
+
+	return 0;
+
+err_release_regions:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+err_freemem:
+	pci_set_drvdata(pdev, NULL);
+	devm_kfree(dev, rvu);
+	return err;
+}
+
+static void rvu_remove(struct pci_dev *pdev)
+{
+	struct rvu *rvu = pci_get_drvdata(pdev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	devm_kfree(&pdev->dev, rvu);
+}
+
+static struct pci_driver rvu_driver = {
+	.name = DRV_NAME,
+	.id_table = rvu_id_table,
+	.probe = rvu_probe,
+	.remove = rvu_remove,
+};
+
+static int __init rvu_init_module(void)
+{
+	pr_info("%s: %s\n", DRV_NAME, DRV_STRING);
+
+	return pci_register_driver(&rvu_driver);
+}
+
+static void __exit rvu_cleanup_module(void)
+{
+	pci_unregister_driver(&rvu_driver);
+}
+
+module_init(rvu_init_module);
+module_exit(rvu_cleanup_module);

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0
+ * Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef RVU_H
+#define RVU_H
+
+/* PCI device IDs */
+#define	PCI_DEVID_OCTEONTX2_RVU_AF		0xA065
+
+/* PCI BAR nos */
+#define	PCI_AF_REG_BAR_NUM			0
+#define	PCI_PF_REG_BAR_NUM			2
+#define	PCI_MBOX_BAR_NUM			4
+
+#define NAME_SIZE				32
+
+struct rvu {
+	void __iomem		*afreg_base;
+	void __iomem		*pfreg_base;
+	struct pci_dev		*pdev;
+	struct device		*dev;
+};
+
+#endif /* RVU_H */