/*
* MOSCHIP MCS7830 based USB 2.0 Ethernet Devices
*
* based on usbnet.c, asix.c and the vendor provided mcs7830 driver
*
* Copyright (C) 2010 Andreas Mohr <andi@lisas.de>
* Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
* Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
* Copyright (c) 2002-2003 TiVo Inc.
*
* Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
*
* TODO:
* - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
* - implement ethtool_ops get_pauseparam/set_pauseparam
* via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
* - implement get_eeprom/[set_eeprom]
* - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
* - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
* can access only ~ 24, remaining user buffer is uninitialized garbage
* - anything else?
*
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>
/* requests */
#define MCS7830_RD_BMREQ (USB_DIR_IN | USB_TYPE_VENDOR | \
USB_RECIP_DEVICE)
#define MCS7830_WR_BMREQ (USB_DIR_OUT | USB_TYPE_VENDOR | \
USB_RECIP_DEVICE)
#define MCS7830_RD_BREQ 0x0E
#define MCS7830_WR_BREQ 0x0D
#define MCS7830_CTRL_TIMEOUT 1000
#define MCS7830_MAX_MCAST 64
#define MCS7830_VENDOR_ID 0x9710
#define MCS7830_PRODUCT_ID 0x7830
#define MCS7730_PRODUCT_ID 0x7730
#define SITECOM_VENDOR_ID 0x0DF6
#define LN_030_PRODUCT_ID 0x0021
#define MCS7830_MII_ADVERTISE (ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
ADVERTISE_100HALF | ADVERTISE_10FULL | \
ADVERTISE_10HALF | ADVERTISE_CSMA)
/* HIF_REG_XX corresponding index value */
enum {
HIF_REG_MULTICAST_HASH = 0x00,
HIF_REG_PACKET_GAP1 = 0x08,
HIF_REG_PACKET_GAP2 = 0x09,
HIF_REG_PHY_DATA = 0x0a,
HIF_REG_PHY_CMD1 = 0x0c,
HIF_REG_PHY_CMD1_READ = 0x40,
HIF_REG_PHY_CMD1_WRITE = 0x20,
HIF_REG_PHY_CMD1_PHYADDR = 0x01,
HIF_REG_PHY_CMD2 = 0x0d,
HIF_REG_PHY_CMD2_PEND_FLAG_BIT = 0x80,
HIF_REG_PHY_CMD2_READY_FLAG_BIT = 0x40,
HIF_REG_CONFIG = 0x0e,
/* hmm, spec sez: "R/W", "Except bit 3" (likely TXENABLE). */
HIF_REG_CONFIG_CFG = 0x80,
HIF_REG_CONFIG_SPEED100 = 0x40,
HIF_REG_CONFIG_FULLDUPLEX_ENABLE = 0x20,
HIF_REG_CONFIG_RXENABLE = 0x10,
HIF_REG_CONFIG_TXENABLE = 0x08,
HIF_REG_CONFIG_SLEEPMODE = 0x04,
HIF_REG_CONFIG_ALLMULTICAST = 0x02,
HIF_REG_CONFIG_PROMISCUOUS = 0x01,
HIF_REG_ETHERNET_ADDR = 0x0f,
HIF_REG_FRAME_DROP_COUNTER = 0x15, /* 0..ff; reset: 0 */
HIF_REG_PAUSE_THRESHOLD = 0x16,
HIF_REG_PAUSE_THRESHOLD_DEFAULT = 0,
};
/* Trailing status byte in Ethernet Rx frame */
enum {
MCS7830_RX_SHORT_FRAME = 0x01, /* < 64 bytes */
MCS7830_RX_LENGTH_ERROR = 0x02, /* framelen != Ethernet length field */
MCS7830_RX_ALIGNMENT_ERROR = 0x04, /* non-even number of nibbles */
MCS7830_RX_CRC_ERROR = 0x08,
MCS7830_RX_LARGE_FRAME = 0x10, /* > 1518 bytes */
MCS7830_RX_FRAME_CORRECT = 0x20, /* frame is correct */
/* [7:6] reserved */
};
struct mcs7830_data {
u8 multi_filter[8];
u8 config;
};
static const char driver_name[] = "MOSCHIP usb-ethernet driver";
static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
{
struct usb_device *xdev = dev->udev;
int ret;
void *buffer;
buffer = kmalloc(size, GFP_NOIO);
if (buffer == NULL)
return -ENOMEM;
ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
MCS7830_RD_BMREQ, 0x0000, index, buffer,
size, MCS7830_CTRL_TIMEOUT);
memcpy(data, buffer, size);
kfree(buffer);
return ret;
}
static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
{
struct usb_device *xdev = dev->udev;
int ret;
void *buffer;
buffer = kmemdup(data, size, GFP_NOIO);
if (buffer == NULL)
return -ENOMEM;
ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
MCS7830_WR_BMREQ, 0x0000, index, buffer,
size, MCS7830_CTRL_TIMEOUT);
kfree(buffer);
return ret;
}
static void mcs7830_async_cmd_callback(struct urb *urb)
{
struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
int status = urb->status;
if (status < 0)
printk(KERN_DEBUG "%s() failed with %d\n",
__func__, status);
kfree(req);
usb_free_urb(urb);
}
static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
{
struct usb_ctrlrequest *req;
int ret;
struct urb *urb;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
dev_dbg(&dev->udev->dev,
"Error allocating URB in write_cmd_async!\n");
return;
}
req = kmalloc(sizeof *req, GFP_ATOMIC);
if (!req) {
dev_err(&dev->udev->dev,
"Failed to allocate memory for control request\n");
goto out;
}
req->bRequestType = MCS7830_WR_BMREQ;
req->bRequest = MCS7830_WR_BREQ;
req->wValue = 0;
req->wIndex = cpu_to_le16(index);
req->wLength = cpu_to_le16(size);
usb_fill_control_urb(urb, dev->udev,
usb_sndctrlpipe(dev->udev, 0),
(void *)req, data, size,
mcs7830_async_cmd_callback, req);
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret < 0) {
dev_err(&dev->udev->dev,
"Error submitting the control message: ret=%d\n", ret);
goto out;
}
return;
out:
kfree(req);
usb_free_urb(urb);
}
static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
{
int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
if (ret < 0)
return ret;
return 0;
}
static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
{
int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
if (ret < 0)
return ret;
return 0;
}
static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
{
int ret;
struct usbnet *dev = netdev_priv(netdev);
struct sockaddr *addr = p;
if (netif_running(netdev))
return -EBUSY;
if (!is_valid_ether_addr(addr->sa_data))
return -EINVAL;
ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
if (ret < 0)
return ret;
/* it worked --> adopt it on netdev side */
memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
return 0;
}
static int mcs7830_read_phy(struct usbnet *dev, u8 index)
{
int ret;
int i;
__le16 val;
u8 cmd[2] = {
HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
};
mutex_lock(&dev->phy_mutex);
/* write the MII command */
ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
if (ret < 0)
goto out;
/* wait for the data to become valid, should be within < 1ms */
for (i = 0; i < 10; i++) {
ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
break;
ret = -EIO;
msleep(1);
}
if (ret < 0)
goto out;
/* read actual register contents */
ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
if (ret < 0)
goto out;
ret = le16_to_cpu(val);
dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
index, val, i);
out:
mutex_unlock(&dev->phy_mutex);
return ret;
}
static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
{
int ret;
int i;
__le16 le_val;
u8 cmd[2] = {
HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
};
mutex_lock(&dev->phy_mutex);
/* write the new register contents */
le_val = cpu_to_le16(val);
ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
if (ret < 0)
goto out;
/* write the MII command */
ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
if (ret < 0)
goto out;
/* wait for the command to be accepted by the PHY */
for (i = 0; i < 10; i++) {
ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
break;
ret = -EIO;
msleep(1);
}
if (ret < 0)
goto out;
ret = 0;
dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
index, val, i);
out:
mutex_unlock(&dev->phy_mutex);
return ret;
}
/*
* This algorithm comes from the original mcs7830 version 1.4 driver,
* not sure if it is needed.
*/
static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
{
int ret;
/* Enable all media types */
ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
/* First reset BMCR */
if (!ret)
ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
/* Enable Auto Neg */
if (!ret)
ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
if (!ret)
ret = mcs7830_write_phy(dev, MII_BMCR,
BMCR_ANENABLE | BMCR_ANRESTART );
return ret < 0 ? : 0;
}
/*
* if we can read register 22, the chip revision is C or higher
*/
static int mcs7830_get_rev(struct usbnet *dev)
{
u8 dummy[2];
int ret;
ret = mcs7830_get_reg(dev, HIF_REG_FRAME_DROP_COUNTER, 2, dummy);
if (ret > 0)
return 2; /* Rev C or later */
return 1; /* earlier revision */
}
/*
* On rev. C we need to set the pause threshold
*/
static void mcs7830_rev_C_fixup(struct usbnet *dev)
{
u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
int retry;
for (retry = 0; retry < 2; retry++) {
if (mcs7830_get_rev(dev) == 2) {
dev_info(&dev->udev->dev, "applying rev.C fixup\n");
mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
1, &pause_threshold);
}
msleep(1);
}
}
static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
int location)
{
struct usbnet *dev = netdev_priv(netdev);
return mcs7830_read_phy(dev, location);
}
static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
int location, int val)
{
struct usbnet *dev = netdev_priv(netdev);
mcs7830_write_phy(dev, location, val);
}
static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
{
struct usbnet *dev = netdev_priv(net);
return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}
static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
{
return (struct mcs7830_data *)&dev->data;
}
static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
{
struct mcs7830_data *data = mcs7830_get_data(dev);
mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
sizeof data->multi_filter,
data->multi_filter);
}
static void mcs7830_hif_update_config(struct usbnet *dev)
{
/* implementation specific to data->config
(argument needs to be heap-based anyway - USB DMA!) */
struct mcs7830_data *data = mcs7830_get_data(dev);
mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
}
static void mcs7830_data_set_multicast(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct mcs7830_data *data = mcs7830_get_data(dev);
memset(data->multi_filter, 0, sizeof data->multi_filter);
data->config = HIF_REG_CONFIG_TXENABLE;
/* this should not be needed, but it doesn't work otherwise */
data->config |= HIF_REG_CONFIG_ALLMULTICAST;
if (net->flags & IFF_PROMISC) {
data->config |= HIF_REG_CONFIG_PROMISCUOUS;
} else if (net->flags & IFF_ALLMULTI ||
netdev_mc_count(net) > MCS7830_MAX_MCAST) {
data->config |= HIF_REG_CONFIG_ALLMULTICAST;
} else if (netdev_mc_empty(net)) {
/* just broadcast and directed */
} else {
/* We use the 20 byte dev->data
* for our 8 byte filter buffer
* to avoid allocating memory that
* is tricky to free later */
struct netdev_hw_addr *ha;
u32 crc_bits;
/* Build the multicast hash filter. */
netdev_for_each_mc_addr(ha, net) {
crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
}
}
}
static int mcs7830_apply_base_config(struct usbnet *dev)
{
int ret;
/* re-configure known MAC (suspend case etc.) */
ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
if (ret) {
dev_info(&dev->udev->dev, "Cannot set MAC address\n");
goto out;
}
/* Set up PHY */
ret = mcs7830_set_autoneg(dev, 0);
if (ret) {
dev_info(&dev->udev->dev, "Cannot set autoneg\n");
goto out;
}
mcs7830_hif_update_multicast_hash(dev);
mcs7830_hif_update_config(dev);
mcs7830_rev_C_fixup(dev);
ret = 0;
out:
return ret;
}
/* credits go to asix_set_multicast */
static void mcs7830_set_multicast(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
mcs7830_data_set_multicast(net);
mcs7830_hif_update_multicast_hash(dev);
mcs7830_hif_update_config(dev);
}
static int mcs7830_get_regs_len(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
switch (mcs7830_get_rev(dev)) {
case 1:
return 21;
case 2:
return 32;
}
return 0;
}
static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
{
usbnet_get_drvinfo(net, drvinfo);
drvinfo->regdump_len = mcs7830_get_regs_len(net);
}
static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
{
struct usbnet *dev = netdev_priv(net);
regs->version = mcs7830_get_rev(dev);
mcs7830_get_reg(dev, 0, regs->len, data);
}
static const struct ethtool_ops mcs7830_ethtool_ops = {
.get_drvinfo = mcs7830_get_drvinfo,
.get_regs_len = mcs7830_get_regs_len,
.get_regs = mcs7830_get_regs,
/* common usbnet calls */
.get_link = usbnet_get_link,
.get_msglevel = usbnet_get_msglevel,
.set_msglevel = usbnet_set_msglevel,
.get_settings = usbnet_get_settings,
.set_settings = usbnet_set_settings,
.nway_reset = usbnet_nway_reset,
};
static const struct net_device_ops mcs7830_netdev_ops = {
.ndo_open = usbnet_open,
.ndo_stop = usbnet_stop,
.ndo_start_xmit = usbnet_start_xmit,
.ndo_tx_timeout = usbnet_tx_timeout,
.ndo_change_mtu = usbnet_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = mcs7830_ioctl,
.ndo_set_multicast_list = mcs7830_set_multicast,
.ndo_set_mac_address = mcs7830_set_mac_address,
};
static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
{
struct net_device *net = dev->net;
int ret;
int retry;
/* Initial startup: Gather MAC address setting from EEPROM */
ret = -EINVAL;
for (retry = 0; retry < 5 && ret; retry++)
ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
if (ret) {
dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
goto out;
}
mcs7830_data_set_multicast(net);
ret = mcs7830_apply_base_config(dev);
if (ret)
goto out;
net->ethtool_ops = &mcs7830_ethtool_ops;
net->netdev_ops = &mcs7830_netdev_ops;
/* reserve space for the status byte on rx */
dev->rx_urb_size = ETH_FRAME_LEN + 1;
dev->mii.mdio_read = mcs7830_mdio_read;
dev->mii.mdio_write = mcs7830_mdio_write;
dev->mii.dev = net;
dev->mii.phy_id_mask = 0x3f;
dev->mii.reg_num_mask = 0x1f;
dev->mii.phy_id = *((u8 *) net->dev_addr + 1);
ret = usbnet_get_endpoints(dev, udev);
out:
return ret;
}
/* The chip always appends a status byte that we need to strip */
static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
u8 status;
if (skb->len == 0) {
dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
return 0;
}
skb_trim(skb, skb->len - 1);
status = skb->data[skb->len];
if (status != MCS7830_RX_FRAME_CORRECT) {
dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
/* hmm, perhaps usbnet.c already sees a globally visible
frame error and increments rx_errors on its own already? */
dev->net->stats.rx_errors++;
if (status & (MCS7830_RX_SHORT_FRAME
|MCS7830_RX_LENGTH_ERROR
|MCS7830_RX_LARGE_FRAME))
dev->net->stats.rx_length_errors++;
if (status & MCS7830_RX_ALIGNMENT_ERROR)
dev->net->stats.rx_frame_errors++;
if (status & MCS7830_RX_CRC_ERROR)
dev->net->stats.rx_crc_errors++;
}
return skb->len > 0;
}
static const struct driver_info moschip_info = {
.description = "MOSCHIP 7830/7730 usb-NET adapter",
.bind = mcs7830_bind,
.rx_fixup = mcs7830_rx_fixup,
.flags = FLAG_ETHER,
.in = 1,
.out = 2,
};
static const struct driver_info sitecom_info = {
.description = "Sitecom LN-30 usb-NET adapter",
.bind = mcs7830_bind,
.rx_fixup = mcs7830_rx_fixup,
.flags = FLAG_ETHER,
.in = 1,
.out = 2,
};
static const struct usb_device_id products[] = {
{
USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
.driver_info = (unsigned long) &moschip_info,
},
{
USB_DEVICE(MCS7830_VENDOR_ID, MCS7730_PRODUCT_ID),
.driver_info = (unsigned long) &moschip_info,
},
{
USB_DEVICE(SITECOM_VENDOR_ID, LN_030_PRODUCT_ID),
.driver_info = (unsigned long) &sitecom_info,
},
{},
};
MODULE_DEVICE_TABLE(usb, products);
static int mcs7830_reset_resume (struct usb_interface *intf)
{
/* YES, this function is successful enough that ethtool -d
does show same output pre-/post-suspend */
struct usbnet *dev = usb_get_intfdata(intf);
mcs7830_apply_base_config(dev);
usbnet_resume(intf);
return 0;
}
static struct usb_driver mcs7830_driver = {
.name = driver_name,
.id_table = products,
.probe = usbnet_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.reset_resume = mcs7830_reset_resume,
};
static int __init mcs7830_init(void)
{
return usb_register(&mcs7830_driver);
}
module_init(mcs7830_init);
static void __exit mcs7830_exit(void)
{
usb_deregister(&mcs7830_driver);
}
module_exit(mcs7830_exit);
MODULE_DESCRIPTION("USB to network adapter MCS7830)");
MODULE_LICENSE("GPL");
