Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 319 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ibm/emac/rgmii.c b/drivers/net/ethernet/ibm/emac/rgmii.c
new file mode 100644
index 000000000..00f5999de
--- /dev/null
+++ b/drivers/net/ethernet/ibm/emac/rgmii.c
@@ -0,0 +1,319 @@
+/*
+ * drivers/net/ethernet/ibm/emac/rgmii.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
+ *
+ * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
+ *                <benh@kernel.crashing.org>
+ *
+ * Based on the arch/ppc version of the driver:
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * 	Matt Porter <mporter@kernel.crashing.org>
+ * 	Copyright 2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/ethtool.h>
+#include <linux/of_address.h>
+#include <asm/io.h>
+
+#include "emac.h"
+#include "debug.h"
+
+// XXX FIXME: Axon seems to support a subset of the RGMII, we
+// thus need to take that into account and possibly change some
+// of the bit settings below that don't seem to quite match the
+// AXON spec
+
+/* RGMIIx_FER */
+#define RGMII_FER_MASK(idx)	(0x7 << ((idx) * 4))
+#define RGMII_FER_RTBI(idx)	(0x4 << ((idx) * 4))
+#define RGMII_FER_RGMII(idx)	(0x5 << ((idx) * 4))
+#define RGMII_FER_TBI(idx)	(0x6 << ((idx) * 4))
+#define RGMII_FER_GMII(idx)	(0x7 << ((idx) * 4))
+#define RGMII_FER_MII(idx)	RGMII_FER_GMII(idx)
+
+/* RGMIIx_SSR */
+#define RGMII_SSR_MASK(idx)	(0x7 << ((idx) * 8))
+#define RGMII_SSR_10(idx)	(0x1 << ((idx) * 8))
+#define RGMII_SSR_100(idx)	(0x2 << ((idx) * 8))
+#define RGMII_SSR_1000(idx)	(0x4 << ((idx) * 8))
+
+/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
+static inline int rgmii_valid_mode(int phy_mode)
+{
+	return  phy_interface_mode_is_rgmii(phy_mode) ||
+		phy_mode == PHY_INTERFACE_MODE_GMII ||
+		phy_mode == PHY_INTERFACE_MODE_MII ||
+		phy_mode == PHY_INTERFACE_MODE_TBI ||
+		phy_mode == PHY_INTERFACE_MODE_RTBI;
+}
+
+static inline u32 rgmii_mode_mask(int mode, int input)
+{
+	switch (mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		return RGMII_FER_RGMII(input);
+	case PHY_INTERFACE_MODE_TBI:
+		return RGMII_FER_TBI(input);
+	case PHY_INTERFACE_MODE_GMII:
+		return RGMII_FER_GMII(input);
+	case PHY_INTERFACE_MODE_MII:
+		return RGMII_FER_MII(input);
+	case PHY_INTERFACE_MODE_RTBI:
+		return RGMII_FER_RTBI(input);
+	default:
+		BUG();
+	}
+}
+
+int rgmii_attach(struct platform_device *ofdev, int input, int mode)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct rgmii_regs __iomem *p = dev->base;
+
+	RGMII_DBG(dev, "attach(%d)" NL, input);
+
+	/* Check if we need to attach to a RGMII */
+	if (input < 0 || !rgmii_valid_mode(mode)) {
+		printk(KERN_ERR "%pOF: unsupported settings !\n",
+		       ofdev->dev.of_node);
+		return -ENODEV;
+	}
+
+	mutex_lock(&dev->lock);
+
+	/* Enable this input */
+	out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
+
+	printk(KERN_NOTICE "%pOF: input %d in %s mode\n",
+	       ofdev->dev.of_node, input, phy_modes(mode));
+
+	++dev->users;
+
+	mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct rgmii_regs __iomem *p = dev->base;
+	u32 ssr;
+
+	mutex_lock(&dev->lock);
+
+	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
+
+	RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
+
+	if (speed == SPEED_1000)
+		ssr |= RGMII_SSR_1000(input);
+	else if (speed == SPEED_100)
+		ssr |= RGMII_SSR_100(input);
+	else if (speed == SPEED_10)
+		ssr |= RGMII_SSR_10(input);
+
+	out_be32(&p->ssr, ssr);
+
+	mutex_unlock(&dev->lock);
+}
+
+void rgmii_get_mdio(struct platform_device *ofdev, int input)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct rgmii_regs __iomem *p = dev->base;
+	u32 fer;
+
+	RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
+
+	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
+		return;
+
+	mutex_lock(&dev->lock);
+
+	fer = in_be32(&p->fer);
+	fer |= 0x00080000u >> input;
+	out_be32(&p->fer, fer);
+	(void)in_be32(&p->fer);
+
+	DBG2(dev, " fer = 0x%08x\n", fer);
+}
+
+void rgmii_put_mdio(struct platform_device *ofdev, int input)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct rgmii_regs __iomem *p = dev->base;
+	u32 fer;
+
+	RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
+
+	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
+		return;
+
+	fer = in_be32(&p->fer);
+	fer &= ~(0x00080000u >> input);
+	out_be32(&p->fer, fer);
+	(void)in_be32(&p->fer);
+
+	DBG2(dev, " fer = 0x%08x\n", fer);
+
+	mutex_unlock(&dev->lock);
+}
+
+void rgmii_detach(struct platform_device *ofdev, int input)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct rgmii_regs __iomem *p;
+
+	BUG_ON(!dev || dev->users == 0);
+	p = dev->base;
+
+	mutex_lock(&dev->lock);
+
+	RGMII_DBG(dev, "detach(%d)" NL, input);
+
+	/* Disable this input */
+	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
+
+	--dev->users;
+
+	mutex_unlock(&dev->lock);
+}
+
+int rgmii_get_regs_len(struct platform_device *ofdev)
+{
+	return sizeof(struct emac_ethtool_regs_subhdr) +
+		sizeof(struct rgmii_regs);
+}
+
+void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+	struct emac_ethtool_regs_subhdr *hdr = buf;
+	struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
+
+	hdr->version = 0;
+	hdr->index = 0; /* for now, are there chips with more than one
+			 * rgmii ? if yes, then we'll add a cell_index
+			 * like we do for emac
+			 */
+	memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
+	return regs + 1;
+}
+
+
+static int rgmii_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct rgmii_instance *dev;
+	struct resource regs;
+	int rc;
+
+	rc = -ENOMEM;
+	dev = kzalloc(sizeof(struct rgmii_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 rgmii_regs __iomem *)ioremap(regs.start,
+						 sizeof(struct rgmii_regs));
+	if (dev->base == NULL) {
+		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
+		goto err_free;
+	}
+
+	/* Check for RGMII flags */
+	if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
+		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
+
+	/* CAB lacks the right properties, fix this up */
+	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
+		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
+
+	DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
+	     in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
+
+	/* Disable all inputs by default */
+	out_be32(&dev->base->fer, 0);
+
+	printk(KERN_INFO
+	       "RGMII %pOF initialized with%s MDIO support\n",
+	       ofdev->dev.of_node,
+	       (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
+
+	wmb();
+	platform_set_drvdata(ofdev, dev);
+
+	return 0;
+
+ err_free:
+	kfree(dev);
+ err_gone:
+	return rc;
+}
+
+static int rgmii_remove(struct platform_device *ofdev)
+{
+	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
+
+	WARN_ON(dev->users != 0);
+
+	iounmap(dev->base);
+	kfree(dev);
+
+	return 0;
+}
+
+static const struct of_device_id rgmii_match[] =
+{
+	{
+		.compatible	= "ibm,rgmii",
+	},
+	{
+		.type		= "emac-rgmii",
+	},
+	{},
+};
+
+static struct platform_driver rgmii_driver = {
+	.driver = {
+		.name = "emac-rgmii",
+		.of_match_table = rgmii_match,
+	},
+	.probe = rgmii_probe,
+	.remove = rgmii_remove,
+};
+
+int __init rgmii_init(void)
+{
+	return platform_driver_register(&rgmii_driver);
+}
+
+void rgmii_exit(void)
+{
+	platform_driver_unregister(&rgmii_driver);
+}