448 lines
9.3 KiB
C
448 lines
9.3 KiB
C
/*
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* Marvell 88E6060 switch driver
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* Copyright (c) 2008 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License v2 as published by the
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* Free Software Foundation
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/phy.h>
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#include <linux/if_vlan.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include "mvswitch.h"
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/* Undefine this to use trailer mode instead.
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* I don't know if header mode works with all chips */
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#define HEADER_MODE 1
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MODULE_DESCRIPTION("Marvell 88E6060 Switch driver");
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MODULE_AUTHOR("Felix Fietkau");
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MODULE_LICENSE("GPL");
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struct mvswitch_priv {
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/* the driver's tx function */
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int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
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struct vlan_group *grp;
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u8 vlans[16];
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};
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#define to_mvsw(_phy) ((struct mvswitch_priv *) (_phy)->priv)
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static inline u16
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r16(struct phy_device *phydev, int addr, int reg)
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{
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return phydev->bus->read(phydev->bus, addr, reg);
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}
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static inline void
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w16(struct phy_device *phydev, int addr, int reg, u16 val)
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{
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phydev->bus->write(phydev->bus, addr, reg, val);
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}
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static int
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mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
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{
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struct mvswitch_priv *priv;
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char *buf = NULL;
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u16 vid;
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priv = dev->phy_ptr;
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if (unlikely(!priv))
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goto error;
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if (unlikely(skb->len < 16))
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goto error;
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#ifdef HEADER_MODE
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if (__vlan_hwaccel_get_tag(skb, &vid))
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goto error;
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if ((skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
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if (pskb_expand_head(skb, MV_HEADER_SIZE, 0, GFP_ATOMIC))
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goto error_expand;
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if (skb->len < 62)
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skb->len = 62;
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}
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buf = skb_push(skb, MV_HEADER_SIZE);
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#else
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if (__vlan_get_tag(skb, &vid))
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goto error;
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if (unlikely((vid > 15 || !priv->vlans[vid])))
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goto error;
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if (skb->len <= 64) {
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if (pskb_expand_head(skb, 0, 64 + MV_TRAILER_SIZE - skb->len, GFP_ATOMIC))
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goto error_expand;
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buf = skb->data + 64;
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skb->len = 64 + MV_TRAILER_SIZE;
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} else {
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if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
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if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC))
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goto error_expand;
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}
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buf = skb_put(skb, 4);
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}
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/* move the ethernet header 4 bytes forward, overwriting the vlan tag */
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memmove(skb->data + 4, skb->data, 12);
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skb->data += 4;
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skb->len -= 4;
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skb->mac_header += 4;
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#endif
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if (!buf)
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goto error;
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#ifdef HEADER_MODE
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/* prepend the tag */
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*((__be16 *) buf) = cpu_to_be16(
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((vid << MV_HEADER_VLAN_S) & MV_HEADER_VLAN_M) |
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((priv->vlans[vid] << MV_HEADER_PORTS_S) & MV_HEADER_PORTS_M)
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);
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#else
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/* append the tag */
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*((__be32 *) buf) = cpu_to_be32((
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(MV_TRAILER_OVERRIDE << MV_TRAILER_FLAGS_S) |
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((priv->vlans[vid] & MV_TRAILER_PORTS_M) << MV_TRAILER_PORTS_S)
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));
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#endif
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return priv->hardstart(skb, dev);
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error_expand:
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if (net_ratelimit())
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printk("%s: failed to expand/update skb for the switch\n", dev->name);
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error:
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/* any errors? drop the packet! */
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dev_kfree_skb_any(skb);
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return 0;
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}
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static int
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mvswitch_mangle_rx(struct sk_buff *skb, int napi)
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{
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struct mvswitch_priv *priv;
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struct net_device *dev;
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int vlan = -1;
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unsigned char *buf;
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int i;
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dev = skb->dev;
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if (!dev)
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goto error;
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priv = dev->phy_ptr;
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if (!priv)
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goto error;
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if (!priv->grp)
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goto error;
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#ifdef HEADER_MODE
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buf = skb->data;
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skb_pull(skb, MV_HEADER_SIZE);
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#else
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buf = skb->data + skb->len - MV_TRAILER_SIZE;
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if (buf[0] != 0x80)
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goto error;
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#endif
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/* look for the vlan matching the incoming port */
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for (i = 0; i < ARRAY_SIZE(priv->vlans); i++) {
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if ((1 << buf[1]) & priv->vlans[i])
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vlan = i;
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}
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if (vlan == -1)
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goto error;
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skb->protocol = eth_type_trans(skb, skb->dev);
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if (napi)
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return vlan_hwaccel_receive_skb(skb, priv->grp, vlan);
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else
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return vlan_hwaccel_rx(skb, priv->grp, vlan);
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error:
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/* no vlan? eat the packet! */
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dev_kfree_skb_any(skb);
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return 0;
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}
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static int
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mvswitch_netif_rx(struct sk_buff *skb)
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{
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return mvswitch_mangle_rx(skb, 0);
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}
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static int
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mvswitch_netif_receive_skb(struct sk_buff *skb)
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{
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return mvswitch_mangle_rx(skb, 1);
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}
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static void
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mvswitch_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
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{
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struct mvswitch_priv *priv = dev->phy_ptr;
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priv->grp = grp;
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}
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static int
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mvswitch_config_init(struct phy_device *pdev)
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{
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struct mvswitch_priv *priv = to_mvsw(pdev);
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struct net_device *dev = pdev->attached_dev;
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u8 vlmap = 0;
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int i;
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if (!dev)
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return -EINVAL;
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printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
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pdev->supported = ADVERTISED_100baseT_Full;
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pdev->advertising = ADVERTISED_100baseT_Full;
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dev->phy_ptr = priv;
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/* initialize default vlans */
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for (i = 0; i < MV_PORTS; i++)
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priv->vlans[(i == MV_WANPORT ? 1 : 0)] |= (1 << i);
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/* before entering reset, disable all ports */
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for (i = 0; i < MV_PORTS; i++)
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w16(pdev, MV_PORTREG(CONTROL, i), 0x00);
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msleep(2); /* wait for the status change to settle in */
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/* put the device in reset and set ATU flags */
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w16(pdev, MV_SWITCHREG(ATU_CTRL),
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MV_ATUCTL_RESET |
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MV_ATUCTL_ATU_1K |
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MV_ATUCTL_AGETIME(4080) /* maximum */
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);
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i = 100; /* timeout */
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do {
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if (!(r16(pdev, MV_SWITCHREG(ATU_CTRL)) & MV_ATUCTL_RESET))
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break;
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msleep(1);
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} while (--i > 0);
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if (!i) {
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printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
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return -ETIMEDOUT;
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}
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/* initialize the cpu port */
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w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
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#ifdef HEADER_MODE
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MV_PORTCTRL_HEADER |
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#else
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MV_PORTCTRL_RXTR |
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MV_PORTCTRL_TXTR |
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#endif
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MV_PORTCTRL_ENABLED
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);
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/* wait for the phy change to settle in */
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msleep(2);
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for (i = 0; i < MV_PORTS; i++) {
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u8 pvid = 0;
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int j;
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vlmap = 0;
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/* look for the matching vlan */
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for (j = 0; j < ARRAY_SIZE(priv->vlans); j++) {
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if (priv->vlans[j] & (1 << i)) {
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vlmap = priv->vlans[j];
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pvid = j;
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}
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}
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/* leave port unconfigured if it's not part of a vlan */
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if (!vlmap)
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break;
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/* add the cpu port to the allowed destinations list */
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vlmap |= (1 << MV_CPUPORT);
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/* take port out of its own vlan destination map */
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vlmap &= ~(1 << i);
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/* apply vlan settings */
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w16(pdev, MV_PORTREG(VLANMAP, i),
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MV_PORTVLAN_PORTS(vlmap) |
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MV_PORTVLAN_ID(pvid)
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);
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/* re-enable port */
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w16(pdev, MV_PORTREG(CONTROL, i), MV_PORTCTRL_ENABLED);
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}
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/* build the target list for the cpu port */
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for (i = 0; i < MV_PORTS; i++)
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vlmap |= (1 << i);
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w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
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MV_PORTVLAN_PORTS(vlmap)
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);
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/* set the port association vector */
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for (i = 0; i <= MV_PORTS; i++) {
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w16(pdev, MV_PORTREG(ASSOC, i),
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MV_PORTASSOC_PORTS(1 << i)
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);
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}
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/* init switch control */
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w16(pdev, MV_SWITCHREG(CTRL),
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MV_SWITCHCTL_MSIZE |
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MV_SWITCHCTL_DROP
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);
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/* hook into the tx function */
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priv->hardstart = dev->hard_start_xmit;
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pdev->netif_receive_skb = mvswitch_netif_receive_skb;
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pdev->netif_rx = mvswitch_netif_rx;
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dev->hard_start_xmit = mvswitch_mangle_tx;
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dev->vlan_rx_register = mvswitch_vlan_rx_register;
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#ifdef HEADER_MODE
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dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX;
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#else
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dev->features |= NETIF_F_HW_VLAN_RX;
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#endif
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return 0;
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}
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static int
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mvswitch_read_status(struct phy_device *phydev)
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{
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phydev->speed = SPEED_100;
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phydev->duplex = DUPLEX_FULL;
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phydev->state = PHY_UP;
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return 0;
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}
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static int
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mvswitch_config_aneg(struct phy_device *phydev)
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{
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return 0;
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}
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static void
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mvswitch_remove(struct phy_device *pdev)
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{
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struct mvswitch_priv *priv = to_mvsw(pdev);
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struct net_device *dev = pdev->attached_dev;
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/* restore old xmit handler */
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if (priv->hardstart && dev)
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dev->hard_start_xmit = priv->hardstart;
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dev->vlan_rx_register = NULL;
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dev->vlan_rx_kill_vid = NULL;
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dev->phy_ptr = NULL;
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dev->features &= ~NETIF_F_HW_VLAN_RX;
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kfree(priv);
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}
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static bool
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mvswitch_detect(struct mii_bus *bus, int addr)
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{
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u16 reg;
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int i;
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/* we attach to phy id 31 to make sure that the late probe works */
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if (addr != 31)
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return false;
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/* look for the switch on the bus */
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reg = bus->read(bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
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if (reg != MV_IDENT_VALUE)
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return false;
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/*
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* Now that we've established that the switch actually exists, let's
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* get rid of the competition :)
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*/
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for (i = 0; i < 31; i++) {
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if (!bus->phy_map[i])
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continue;
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device_unregister(&bus->phy_map[i]->dev);
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kfree(bus->phy_map[i]);
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bus->phy_map[i] = NULL;
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}
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return true;
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}
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static int
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mvswitch_probe(struct phy_device *pdev)
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{
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struct mvswitch_priv *priv;
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priv = kzalloc(sizeof(struct mvswitch_priv), GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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pdev->priv = priv;
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return 0;
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}
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static struct phy_driver mvswitch_driver = {
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.name = "Marvell 88E6060",
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.features = PHY_BASIC_FEATURES,
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.detect = &mvswitch_detect,
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.probe = &mvswitch_probe,
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.remove = &mvswitch_remove,
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.config_init = &mvswitch_config_init,
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.config_aneg = &mvswitch_config_aneg,
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.read_status = &mvswitch_read_status,
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.driver = { .owner = THIS_MODULE,},
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};
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static int __init
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mvswitch_init(void)
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{
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return phy_driver_register(&mvswitch_driver);
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}
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static void __exit
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mvswitch_exit(void)
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{
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phy_driver_unregister(&mvswitch_driver);
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}
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module_init(mvswitch_init);
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module_exit(mvswitch_exit);
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