openwrtv4/target/linux/generic-2.6/files/drivers/net/phy/mvswitch.c

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/*
* 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"
MODULE_DESCRIPTION("Marvell 88E6060 Switch driver");
MODULE_AUTHOR("Felix Fietkau");
MODULE_LICENSE("GPL");
struct mvswitch_priv {
/* the driver's tx function */
int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
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;
struct vlan_ethhdr *eh;
char *buf = NULL;
u16 vid;
priv = dev->phy_ptr;
if (unlikely(!priv))
goto error;
if (unlikely(skb->len < 16))
goto error;
eh = (struct vlan_ethhdr *) skb->data;
if (be16_to_cpu(eh->h_vlan_proto) != 0x8100)
goto error;
vid = be16_to_cpu(eh->h_vlan_TCI) & VLAN_VID_MASK;
if (unlikely((vid > 15 || !priv->vlans[vid])))
goto error;
if (skb->len <= 64) {
if (pskb_expand_head(skb, 0, 68 - skb->len, GFP_ATOMIC)) {
if (net_ratelimit())
printk("%s: failed to expand/update skb for the switch\n", dev->name);
goto error;
}
buf = skb->data + 64;
skb->len = 68;
} else {
if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC)) {
if (net_ratelimit())
printk("%s: failed to expand/update skb for the switch\n", dev->name);
goto error;
}
}
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;
if (!buf)
goto error;
/* append the tag */
*((u32 *) buf) = (
(0x80 << 24) |
((priv->vlans[vid] & 0x1f) << 16)
);
return priv->hardstart(skb, dev);
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;
buf = skb->data + skb->len - 4;
if (buf[0] != 0x80)
goto error;
/* 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;
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_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;
/* initialize default vlans */
for (i = 0; i < MV_PORTS; i++)
priv->vlans[(i == MV_WANPORT ? 1 : 0)] |= (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 device in reset and set ATU flags */
w16(pdev, MV_SWITCHREG(ATU_CTRL),
MV_ATUCTL_RESET |
MV_ATUCTL_ATU_1K |
MV_ATUCTL_AGETIME(4080) /* maximum */
);
i = 100; /* timeout */
do {
if (!(r16(pdev, MV_SWITCHREG(ATU_CTRL)) & MV_ATUCTL_RESET))
break;
msleep(1);
} while (--i > 0);
if (!i) {
printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
return -ETIMEDOUT;
}
/* initialize the cpu port */
w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
MV_PORTCTRL_ENABLED |
MV_PORTCTRL_VLANTUN |
MV_PORTCTRL_RXTR |
MV_PORTCTRL_TXTR
);
/* 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)
break;
/* 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(pvid)
);
/* re-enable port */
w16(pdev, MV_PORTREG(CONTROL, i), MV_PORTCTRL_ENABLED);
}
/* build the target list for the cpu port */
for (i = 0, vlmap = 0; i < ARRAY_SIZE(priv->vlans); i++)
vlmap |= priv->vlans[i];
w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
MV_PORTVLAN_PORTS(vlmap)
);
/* set the port association vector */
for (i = 0; i <= MV_PORTS; i++) {
w16(pdev, MV_PORTREG(ASSOC, i),
MV_PORTASSOC_PORTS(1 << i)
);
}
/* hook into the tx function */
priv->hardstart = dev->hard_start_xmit;
pdev->netif_receive_skb = mvswitch_netif_receive_skb;
pdev->netif_rx = mvswitch_netif_rx;
dev->hard_start_xmit = mvswitch_mangle_tx;
dev->vlan_rx_register = mvswitch_vlan_rx_register;
dev->features |= NETIF_F_HW_VLAN_RX;
return 0;
}
static int
mvswitch_read_status(struct phy_device *phydev)
{
phydev->speed = SPEED_100;
phydev->duplex = DUPLEX_FULL;
phydev->state = PHY_UP;
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 xmit handler */
if (priv->hardstart && dev)
dev->hard_start_xmit = priv->hardstart;
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 bool
mvswitch_detect(struct mii_bus *bus, int addr)
{
u16 reg;
int i;
/* we attach to phy id 31 to make sure that the late probe works */
if (addr != 31)
return false;
/* look for the switch on the bus */
reg = bus->read(bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
if (reg != MV_IDENT_VALUE)
return false;
/*
* Now that we've established that the switch actually exists, let's
* get rid of the competition :)
*/
for (i = 0; i < 31; i++) {
if (!bus->phy_map[i])
continue;
device_unregister(&bus->phy_map[i]->dev);
kfree(bus->phy_map[i]);
bus->phy_map[i] = NULL;
}
return true;
}
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 struct phy_driver mvswitch_driver = {
.name = "Marvell 88E6060",
.features = PHY_BASIC_FEATURES,
.detect = &mvswitch_detect,
.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)
{
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);