fix mvswitch/ar8216 tx path hooking for 2.6.30

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17121 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 467 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c b/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c
new file mode 100644
index 000000000..7aed70d47
--- /dev/null
+++ b/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c
@@ -0,0 +1,467 @@
+/*
+ * Marvell 88E6060 switch driver
+ * Copyright (c) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of the GNU General Public License v2 as published by the
+ * Free Software Foundation
+ */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+#include <linux/if_vlan.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include "mvswitch.h"
+
+/* Undefine this to use trailer mode instead.
+ * I don't know if header mode works with all chips */
+#define HEADER_MODE	1
+
+MODULE_DESCRIPTION("Marvell 88E6060 Switch driver");
+MODULE_AUTHOR("Felix Fietkau");
+MODULE_LICENSE("GPL");
+
+#define MVSWITCH_MAGIC 0x88E6060
+
+struct mvswitch_priv {
+	const struct net_device_ops *ndo_old;
+	struct net_device_ops ndo;
+	struct vlan_group *grp;
+	u8 vlans[16];
+};
+
+#define to_mvsw(_phy) ((struct mvswitch_priv *) (_phy)->priv)
+
+static inline u16
+r16(struct phy_device *phydev, int addr, int reg)
+{
+	return phydev->bus->read(phydev->bus, addr, reg);
+}
+
+static inline void
+w16(struct phy_device *phydev, int addr, int reg, u16 val)
+{
+	phydev->bus->write(phydev->bus, addr, reg, val);
+}
+
+
+static int
+mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct mvswitch_priv *priv;
+	char *buf = NULL;
+	u16 vid;
+
+	priv = dev->phy_ptr;
+	if (unlikely(!priv))
+		goto error;
+
+	if (unlikely(skb->len < 16))
+		goto error;
+
+#ifdef HEADER_MODE
+	if (__vlan_hwaccel_get_tag(skb, &vid))
+		goto error;
+
+	if (skb_cloned(skb) || (skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
+		if (pskb_expand_head(skb, MV_HEADER_SIZE, (skb->len < 62 ? 62 - skb->len : 0), GFP_ATOMIC))
+			goto error_expand;
+		if (skb->len < 62)
+			skb->len = 62;
+	}
+	buf = skb_push(skb, MV_HEADER_SIZE);
+#else
+	if (__vlan_get_tag(skb, &vid))
+		goto error;
+
+	if (unlikely((vid > 15 || !priv->vlans[vid])))
+		goto error;
+
+	if (skb->len <= 64) {
+		if (pskb_expand_head(skb, 0, 64 + MV_TRAILER_SIZE - skb->len, GFP_ATOMIC))
+			goto error_expand;
+
+		buf = skb->data + 64;
+		skb->len = 64 + MV_TRAILER_SIZE;
+	} else {
+		if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
+			if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC))
+				goto error_expand;
+		}
+		buf = skb_put(skb, 4);
+	}
+
+	/* move the ethernet header 4 bytes forward, overwriting the vlan tag */
+	memmove(skb->data + 4, skb->data, 12);
+	skb->data += 4;
+	skb->len -= 4;
+	skb->mac_header += 4;
+#endif
+
+	if (!buf)
+		goto error;
+
+
+#ifdef HEADER_MODE
+	/* prepend the tag */
+	*((__be16 *) buf) = cpu_to_be16(
+		((vid << MV_HEADER_VLAN_S) & MV_HEADER_VLAN_M) |
+		((priv->vlans[vid] << MV_HEADER_PORTS_S) & MV_HEADER_PORTS_M)
+	);
+#else
+	/* append the tag */
+	*((__be32 *) buf) = cpu_to_be32((
+		(MV_TRAILER_OVERRIDE << MV_TRAILER_FLAGS_S) |
+		((priv->vlans[vid] & MV_TRAILER_PORTS_M) << MV_TRAILER_PORTS_S)
+	));
+#endif
+
+	return priv->ndo_old->ndo_start_xmit(skb, dev);
+
+error_expand:
+	if (net_ratelimit())
+		printk("%s: failed to expand/update skb for the switch\n", dev->name);
+
+error:
+	/* any errors? drop the packet! */
+	dev_kfree_skb_any(skb);
+	return 0;
+}
+
+static int
+mvswitch_mangle_rx(struct sk_buff *skb, int napi)
+{
+	struct mvswitch_priv *priv;
+	struct net_device *dev;
+	int vlan = -1;
+	unsigned char *buf;
+	int i;
+
+	dev = skb->dev;
+	if (!dev)
+		goto error;
+
+	priv = dev->phy_ptr;
+	if (!priv)
+		goto error;
+
+	if (!priv->grp)
+		goto error;
+
+#ifdef HEADER_MODE
+	buf = skb->data;
+	skb_pull(skb, MV_HEADER_SIZE);
+#else
+	buf = skb->data + skb->len - MV_TRAILER_SIZE;
+	if (buf[0] != 0x80)
+		goto error;
+#endif
+
+	/* look for the vlan matching the incoming port */
+	for (i = 0; i < ARRAY_SIZE(priv->vlans); i++) {
+		if ((1 << buf[1]) & priv->vlans[i])
+			vlan = i;
+	}
+
+	if (vlan == -1)
+		goto error;
+
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	if (napi)
+		return vlan_hwaccel_receive_skb(skb, priv->grp, vlan);
+	else
+		return vlan_hwaccel_rx(skb, priv->grp, vlan);
+
+error:
+	/* no vlan? eat the packet! */
+	dev_kfree_skb_any(skb);
+	return 0;
+}
+
+
+static int
+mvswitch_netif_rx(struct sk_buff *skb)
+{
+	return mvswitch_mangle_rx(skb, 0);
+}
+
+static int
+mvswitch_netif_receive_skb(struct sk_buff *skb)
+{
+	return mvswitch_mangle_rx(skb, 1);
+}
+
+
+static void
+mvswitch_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
+{
+	struct mvswitch_priv *priv = dev->phy_ptr;
+	priv->grp = grp;
+}
+
+
+static int
+mvswitch_wait_mask(struct phy_device *pdev, int addr, int reg, u16 mask, u16 val)
+{
+	int i = 100;
+	u16 r;
+
+	do {
+		r = r16(pdev, addr, reg) & mask;
+		if (r == val)
+			return 0;
+	} while(--i > 0);
+	return -ETIMEDOUT;
+}
+
+static int
+mvswitch_config_init(struct phy_device *pdev)
+{
+	struct mvswitch_priv *priv = to_mvsw(pdev);
+	struct net_device *dev = pdev->attached_dev;
+	u8 vlmap = 0;
+	int i;
+
+	if (!dev)
+		return -EINVAL;
+
+	printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
+	pdev->supported = ADVERTISED_100baseT_Full;
+	pdev->advertising = ADVERTISED_100baseT_Full;
+	dev->phy_ptr = priv;
+	dev->irq = PHY_POLL;
+
+	/* initialize default vlans */
+	for (i = 0; i < MV_PORTS; i++)
+		priv->vlans[(i == MV_WANPORT ? 2 : 1)] |= (1 << i);
+
+	/* before entering reset, disable all ports */
+	for (i = 0; i < MV_PORTS; i++)
+		w16(pdev, MV_PORTREG(CONTROL, i), 0x00);
+
+	msleep(2); /* wait for the status change to settle in */
+
+	/* put the ATU in reset */
+	w16(pdev, MV_SWITCHREG(ATU_CTRL), MV_ATUCTL_RESET);
+
+	i = mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_CTRL), MV_ATUCTL_RESET, 0);
+	if (i < 0) {
+		printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
+		return i;
+	}
+
+	/* set the ATU flags */
+	w16(pdev, MV_SWITCHREG(ATU_CTRL),
+		MV_ATUCTL_NO_LEARN |
+		MV_ATUCTL_ATU_1K |
+		MV_ATUCTL_AGETIME(MV_ATUCTL_AGETIME_MIN) /* minimum without disabling ageing */
+	);
+
+	/* initialize the cpu port */
+	w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
+#ifdef HEADER_MODE
+		MV_PORTCTRL_HEADER |
+#else
+		MV_PORTCTRL_RXTR |
+		MV_PORTCTRL_TXTR |
+#endif
+		MV_PORTCTRL_ENABLED
+	);
+	/* wait for the phy change to settle in */
+	msleep(2);
+	for (i = 0; i < MV_PORTS; i++) {
+		u8 pvid = 0;
+		int j;
+
+		vlmap = 0;
+
+		/* look for the matching vlan */
+		for (j = 0; j < ARRAY_SIZE(priv->vlans); j++) {
+			if (priv->vlans[j] & (1 << i)) {
+				vlmap = priv->vlans[j];
+				pvid = j;
+			}
+		}
+		/* leave port unconfigured if it's not part of a vlan */
+		if (!vlmap)
+			continue;
+
+		/* add the cpu port to the allowed destinations list */
+		vlmap |= (1 << MV_CPUPORT);
+
+		/* take port out of its own vlan destination map */
+		vlmap &= ~(1 << i);
+
+		/* apply vlan settings */
+		w16(pdev, MV_PORTREG(VLANMAP, i),
+			MV_PORTVLAN_PORTS(vlmap) |
+			MV_PORTVLAN_ID(i)
+		);
+
+		/* re-enable port */
+		w16(pdev, MV_PORTREG(CONTROL, i),
+			MV_PORTCTRL_ENABLED
+		);
+	}
+
+	w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
+		MV_PORTVLAN_ID(MV_CPUPORT)
+	);
+
+	/* set the port association vector */
+	for (i = 0; i <= MV_PORTS; i++) {
+		w16(pdev, MV_PORTREG(ASSOC, i),
+			MV_PORTASSOC_PORTS(1 << i)
+		);
+	}
+
+	/* init switch control */
+	w16(pdev, MV_SWITCHREG(CTRL),
+		MV_SWITCHCTL_MSIZE |
+		MV_SWITCHCTL_DROP
+	);
+
+	/* hook into the tx function */
+	priv->ndo_old = dev->netdev_ops;
+	memcpy(&priv->ndo, priv->ndo_old, sizeof(struct net_device_ops));
+	priv->ndo.ndo_start_xmit = mvswitch_mangle_tx;
+	priv->ndo.ndo_vlan_rx_register = mvswitch_vlan_rx_register;
+	dev->netdev_ops = &priv->ndo;
+
+	pdev->pkt_align = 2;
+	pdev->netif_receive_skb = mvswitch_netif_receive_skb;
+	pdev->netif_rx = mvswitch_netif_rx;
+#ifdef HEADER_MODE
+	dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX;
+#else
+	dev->features |= NETIF_F_HW_VLAN_RX;
+#endif
+
+	return 0;
+}
+
+static int
+mvswitch_read_status(struct phy_device *pdev)
+{
+	pdev->speed = SPEED_100;
+	pdev->duplex = DUPLEX_FULL;
+	pdev->state = PHY_UP;
+
+	/* XXX ugly workaround: we can't force the switch
+	 * to gracefully handle hosts moving from one port to another,
+	 * so we have to regularly clear the ATU database */
+
+	/* wait for the ATU to become available */
+	mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_OP), MV_ATUOP_INPROGRESS, 0);
+
+	/* flush the ATU */
+	w16(pdev, MV_SWITCHREG(ATU_OP),
+		MV_ATUOP_INPROGRESS |
+		MV_ATUOP_FLUSH_ALL
+	);
+
+	/* wait for operation to complete */
+	mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_OP), MV_ATUOP_INPROGRESS, 0);
+
+	return 0;
+}
+
+static int
+mvswitch_config_aneg(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static void
+mvswitch_remove(struct phy_device *pdev)
+{
+	struct mvswitch_priv *priv = to_mvsw(pdev);
+	struct net_device *dev = pdev->attached_dev;
+
+	/* restore old netdev ops */
+	if (priv->ndo_old && dev)
+		dev->netdev_ops = priv->ndo_old;
+	dev->vlan_rx_register = NULL;
+	dev->vlan_rx_kill_vid = NULL;
+	dev->phy_ptr = NULL;
+	dev->features &= ~NETIF_F_HW_VLAN_RX;
+	kfree(priv);
+}
+
+static int
+mvswitch_probe(struct phy_device *pdev)
+{
+	struct mvswitch_priv *priv;
+
+	priv = kzalloc(sizeof(struct mvswitch_priv), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
+
+	pdev->priv = priv;
+
+	return 0;
+}
+
+static int
+mvswitch_fixup(struct phy_device *dev)
+{
+	u16 reg;
+
+	if (dev->addr != 0x10)
+		return 0;
+
+	reg = dev->bus->read(dev->bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
+	if (reg != MV_IDENT_VALUE)
+		return 0;
+
+	dev->phy_id = MVSWITCH_MAGIC;
+	return 0;
+}
+
+
+static struct phy_driver mvswitch_driver = {
+	.name		= "Marvell 88E6060",
+	.phy_id		= MVSWITCH_MAGIC,
+	.phy_id_mask	= 0xffffffff,
+	.features	= PHY_BASIC_FEATURES,
+	.probe		= &mvswitch_probe,
+	.remove		= &mvswitch_remove,
+	.config_init	= &mvswitch_config_init,
+	.config_aneg	= &mvswitch_config_aneg,
+	.read_status	= &mvswitch_read_status,
+	.driver		= { .owner = THIS_MODULE,},
+};
+
+static int __init
+mvswitch_init(void)
+{
+	phy_register_fixup_for_id(PHY_ANY_ID, mvswitch_fixup);
+	return phy_driver_register(&mvswitch_driver);
+}
+
+static void __exit
+mvswitch_exit(void)
+{
+	phy_driver_unregister(&mvswitch_driver);
+}
+
+module_init(mvswitch_init);
+module_exit(mvswitch_exit);