Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ibm/emac/tah.c b/drivers/net/ethernet/ibm/emac/tah.c
new file mode 100644
index 000000000..008bbdaf1
--- /dev/null
+++ b/drivers/net/ethernet/ibm/emac/tah.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/net/ethernet/ibm/emac/tah.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
+ *
+ * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
+ *                <benh@kernel.crashing.org>
+ *
+ * Based on the arch/ppc version of the driver:
+ *
+ * Copyright 2004 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
+ */
+#include <linux/of_address.h>
+#include <asm/io.h>
+
+#include "emac.h"
+#include "core.h"
+
+int tah_attach(struct platform_device *ofdev, int channel)
+{
+	struct tah_instance *dev = platform_get_drvdata(ofdev);
+
+	mutex_lock(&dev->lock);
+	/* Reset has been done at probe() time... nothing else to do for now */
+	++dev->users;
+	mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+void tah_detach(struct platform_device *ofdev, int channel)
+{
+	struct tah_instance *dev = platform_get_drvdata(ofdev);
+
+	mutex_lock(&dev->lock);
+	--dev->users;
+	mutex_unlock(&dev->lock);
+}
+
+void tah_reset(struct platform_device *ofdev)
+{
+	struct tah_instance *dev = platform_get_drvdata(ofdev);
+	struct tah_regs __iomem *p = dev->base;
+	int n;
+
+	/* Reset TAH */
+	out_be32(&p->mr, TAH_MR_SR);
+	n = 100;
+	while ((in_be32(&p->mr) & TAH_MR_SR) && n)
+		--n;
+
+	if (unlikely(!n))
+		printk(KERN_ERR "%pOF: reset timeout\n", ofdev->dev.of_node);
+
+	/* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
+	out_be32(&p->mr,
+		 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
+		 TAH_MR_DIG);
+}
+
+int tah_get_regs_len(struct platform_device *ofdev)
+{
+	return sizeof(struct emac_ethtool_regs_subhdr) +
+		sizeof(struct tah_regs);
+}
+
+void *tah_dump_regs(struct platform_device *ofdev, void *buf)
+{
+	struct tah_instance *dev = platform_get_drvdata(ofdev);
+	struct emac_ethtool_regs_subhdr *hdr = buf;
+	struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
+
+	hdr->version = 0;
+	hdr->index = 0; /* for now, are there chips with more than one
+			 * zmii ? if yes, then we'll add a cell_index
+			 * like we do for emac
+			 */
+	memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
+	return regs + 1;
+}
+
+static int tah_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct tah_instance *dev;
+	struct resource regs;
+	int rc;
+
+	rc = -ENOMEM;
+	dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
+	if (dev == NULL)
+		goto err_gone;
+
+	mutex_init(&dev->lock);
+	dev->ofdev = ofdev;
+
+	rc = -ENXIO;
+	if (of_address_to_resource(np, 0, &regs)) {
+		printk(KERN_ERR "%pOF: Can't get registers address\n", np);
+		goto err_free;
+	}
+
+	rc = -ENOMEM;
+	dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
+					       sizeof(struct tah_regs));
+	if (dev->base == NULL) {
+		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
+		goto err_free;
+	}
+
+	platform_set_drvdata(ofdev, dev);
+
+	/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
+	tah_reset(ofdev);
+
+	printk(KERN_INFO "TAH %pOF initialized\n", ofdev->dev.of_node);
+	wmb();
+
+	return 0;
+
+ err_free:
+	kfree(dev);
+ err_gone:
+	return rc;
+}
+
+static int tah_remove(struct platform_device *ofdev)
+{
+	struct tah_instance *dev = platform_get_drvdata(ofdev);
+
+	WARN_ON(dev->users != 0);
+
+	iounmap(dev->base);
+	kfree(dev);
+
+	return 0;
+}
+
+static const struct of_device_id tah_match[] =
+{
+	{
+		.compatible	= "ibm,tah",
+	},
+	/* For backward compat with old DT */
+	{
+		.type		= "tah",
+	},
+	{},
+};
+
+static struct platform_driver tah_driver = {
+	.driver = {
+		.name = "emac-tah",
+		.of_match_table = tah_match,
+	},
+	.probe = tah_probe,
+	.remove = tah_remove,
+};
+
+int __init tah_init(void)
+{
+	return platform_driver_register(&tah_driver);
+}
+
+void tah_exit(void)
+{
+	platform_driver_unregister(&tah_driver);
+}