Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 320 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ibm/emac/zmii.c b/drivers/net/ethernet/ibm/emac/zmii.c
new file mode 100644
index 000000000..57a25c7a9
--- /dev/null
+++ b/drivers/net/ethernet/ibm/emac/zmii.c
@@ -0,0 +1,320 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/net/ethernet/ibm/emac/zmii.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, ZMII 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
+ *      Armin Kuster <akuster@mvista.com>
+ * 	Copyright 2001 MontaVista Softare Inc.
+ */
+#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 "core.h"
+
+/* ZMIIx_FER */
+#define ZMII_FER_MDI(idx)	(0x80000000 >> ((idx) * 4))
+#define ZMII_FER_MDI_ALL	(ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
+				 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
+
+#define ZMII_FER_SMII(idx)	(0x40000000 >> ((idx) * 4))
+#define ZMII_FER_RMII(idx)	(0x20000000 >> ((idx) * 4))
+#define ZMII_FER_MII(idx)	(0x10000000 >> ((idx) * 4))
+
+/* ZMIIx_SSR */
+#define ZMII_SSR_SCI(idx)	(0x40000000 >> ((idx) * 4))
+#define ZMII_SSR_FSS(idx)	(0x20000000 >> ((idx) * 4))
+#define ZMII_SSR_SP(idx)	(0x10000000 >> ((idx) * 4))
+
+/* ZMII only supports MII, RMII and SMII
+ * we also support autodetection for backward compatibility
+ */
+static inline int zmii_valid_mode(int mode)
+{
+	return  mode == PHY_INTERFACE_MODE_MII ||
+		mode == PHY_INTERFACE_MODE_RMII ||
+		mode == PHY_INTERFACE_MODE_SMII ||
+		mode == PHY_INTERFACE_MODE_NA;
+}
+
+static inline const char *zmii_mode_name(int mode)
+{
+	switch (mode) {
+	case PHY_INTERFACE_MODE_MII:
+		return "MII";
+	case PHY_INTERFACE_MODE_RMII:
+		return "RMII";
+	case PHY_INTERFACE_MODE_SMII:
+		return "SMII";
+	default:
+		BUG();
+	}
+}
+
+static inline u32 zmii_mode_mask(int mode, int input)
+{
+	switch (mode) {
+	case PHY_INTERFACE_MODE_MII:
+		return ZMII_FER_MII(input);
+	case PHY_INTERFACE_MODE_RMII:
+		return ZMII_FER_RMII(input);
+	case PHY_INTERFACE_MODE_SMII:
+		return ZMII_FER_SMII(input);
+	default:
+		return 0;
+	}
+}
+
+int zmii_attach(struct platform_device *ofdev, int input,
+		phy_interface_t *mode)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+	struct zmii_regs __iomem *p = dev->base;
+
+	ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
+
+	if (!zmii_valid_mode(*mode)) {
+		/* Probably an EMAC connected to RGMII,
+		 * but it still may need ZMII for MDIO so
+		 * we don't fail here.
+		 */
+		dev->users++;
+		return 0;
+	}
+
+	mutex_lock(&dev->lock);
+
+	/* Autodetect ZMII mode if not specified.
+	 * This is only for backward compatibility with the old driver.
+	 * Please, always specify PHY mode in your board port to avoid
+	 * any surprises.
+	 */
+	if (dev->mode == PHY_INTERFACE_MODE_NA) {
+		if (*mode == PHY_INTERFACE_MODE_NA) {
+			u32 r = dev->fer_save;
+
+			ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
+
+			if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
+				dev->mode = PHY_INTERFACE_MODE_MII;
+			else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
+				dev->mode = PHY_INTERFACE_MODE_RMII;
+			else
+				dev->mode = PHY_INTERFACE_MODE_SMII;
+		} else {
+			dev->mode = *mode;
+		}
+		printk(KERN_NOTICE "%pOF: bridge in %s mode\n",
+		       ofdev->dev.of_node,
+		       zmii_mode_name(dev->mode));
+	} else {
+		/* All inputs must use the same mode */
+		if (*mode != PHY_INTERFACE_MODE_NA && *mode != dev->mode) {
+			printk(KERN_ERR
+			       "%pOF: invalid mode %d specified for input %d\n",
+			       ofdev->dev.of_node, *mode, input);
+			mutex_unlock(&dev->lock);
+			return -EINVAL;
+		}
+	}
+
+	/* Report back correct PHY mode,
+	 * it may be used during PHY initialization.
+	 */
+	*mode = dev->mode;
+
+	/* Enable this input */
+	out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
+	++dev->users;
+
+	mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+void zmii_get_mdio(struct platform_device *ofdev, int input)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+	u32 fer;
+
+	ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
+
+	mutex_lock(&dev->lock);
+
+	fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
+	out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
+}
+
+void zmii_put_mdio(struct platform_device *ofdev, int input)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+	ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
+	mutex_unlock(&dev->lock);
+}
+
+
+void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+	u32 ssr;
+
+	mutex_lock(&dev->lock);
+
+	ssr = in_be32(&dev->base->ssr);
+
+	ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
+
+	if (speed == SPEED_100)
+		ssr |= ZMII_SSR_SP(input);
+	else
+		ssr &= ~ZMII_SSR_SP(input);
+
+	out_be32(&dev->base->ssr, ssr);
+
+	mutex_unlock(&dev->lock);
+}
+
+void zmii_detach(struct platform_device *ofdev, int input)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+	BUG_ON(!dev || dev->users == 0);
+
+	mutex_lock(&dev->lock);
+
+	ZMII_DBG(dev, "detach(%d)" NL, input);
+
+	/* Disable this input */
+	out_be32(&dev->base->fer,
+		 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
+
+	--dev->users;
+
+	mutex_unlock(&dev->lock);
+}
+
+int zmii_get_regs_len(struct platform_device *ofdev)
+{
+	return sizeof(struct emac_ethtool_regs_subhdr) +
+		sizeof(struct zmii_regs);
+}
+
+void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+	struct emac_ethtool_regs_subhdr *hdr = buf;
+	struct zmii_regs *regs = (struct zmii_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 zmii_regs));
+	return regs + 1;
+}
+
+static int zmii_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct zmii_instance *dev;
+	struct resource regs;
+	int rc;
+
+	rc = -ENOMEM;
+	dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
+	if (dev == NULL)
+		goto err_gone;
+
+	mutex_init(&dev->lock);
+	dev->ofdev = ofdev;
+	dev->mode = PHY_INTERFACE_MODE_NA;
+
+	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 zmii_regs __iomem *)ioremap(regs.start,
+						sizeof(struct zmii_regs));
+	if (dev->base == NULL) {
+		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
+		goto err_free;
+	}
+
+	/* We may need FER value for autodetection later */
+	dev->fer_save = in_be32(&dev->base->fer);
+
+	/* Disable all inputs by default */
+	out_be32(&dev->base->fer, 0);
+
+	printk(KERN_INFO "ZMII %pOF initialized\n", ofdev->dev.of_node);
+	wmb();
+	platform_set_drvdata(ofdev, dev);
+
+	return 0;
+
+ err_free:
+	kfree(dev);
+ err_gone:
+	return rc;
+}
+
+static int zmii_remove(struct platform_device *ofdev)
+{
+	struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+	WARN_ON(dev->users != 0);
+
+	iounmap(dev->base);
+	kfree(dev);
+
+	return 0;
+}
+
+static const struct of_device_id zmii_match[] =
+{
+	{
+		.compatible	= "ibm,zmii",
+	},
+	/* For backward compat with old DT */
+	{
+		.type		= "emac-zmii",
+	},
+	{},
+};
+
+static struct platform_driver zmii_driver = {
+	.driver = {
+		.name = "emac-zmii",
+		.of_match_table = zmii_match,
+	},
+	.probe = zmii_probe,
+	.remove = zmii_remove,
+};
+
+int __init zmii_init(void)
+{
+	return platform_driver_register(&zmii_driver);
+}
+
+void zmii_exit(void)
+{
+	platform_driver_unregister(&zmii_driver);
+}