Release 4.7 drivers/net/usb/sr9700.c

Directory: drivers/net/usb
/*
 * CoreChip-sz SR9700 one chip USB 1.1 Ethernet Devices
 *
 * Author : Liu Junliang <liujunliang_ljl@163.com>
 *
 * Based on dm9601.c
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/stddef.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <linux/usb/usbnet.h>

#include "sr9700.h"



static int sr_read(struct usbnet *dev, u8 reg, u16 length, void *data)
{
	int err;

	err = usbnet_read_cmd(dev, SR_RD_REGS, SR_REQ_RD_REG, 0, reg, data,
			      length);
	if ((err != length) && (err >= 0))
		err = -EINVAL;
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%



static int sr_write(struct usbnet *dev, u8 reg, u16 length, void *data)
{
	int err;

	err = usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG, 0, reg, data,
			       length);
	if ((err >= 0) && (err < length))
		err = -EINVAL;
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%



static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
{
	return sr_read(dev, reg, 1, value);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%



static int sr_write_reg(struct usbnet *dev, u8 reg, u8 value)
{
	return usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG,
				value, reg, NULL, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



static void sr_write_async(struct usbnet *dev, u8 reg, u16 length, void *data)
{
	usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
			       0, reg, data, length);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%



static void sr_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
{
	usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
			       value, reg, NULL, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



static int wait_phy_eeprom_ready(struct usbnet *dev, int phy)
{
	int i;

	for (i = 0; i < SR_SHARE_TIMEOUT; i++) {
		u8 tmp = 0;
		int ret;

		udelay(1);
		ret = sr_read_reg(dev, SR_EPCR, &tmp);
		if (ret < 0)
			return ret;

		/* ready */
		if (!(tmp & EPCR_ERRE))
			return 0;
	}

	netdev_err(dev->net, "%s write timed out!\n", phy ? "phy" : "eeprom");

	return -EIO;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 97 98.98% 1 50.00%
chen gang chen gang 1 1.02% 1 50.00%
Total 98 100.00% 2 100.00%



static int sr_share_read_word(struct usbnet *dev, int phy, u8 reg,
			      __le16 *value)
{
	int ret;

	mutex_lock(&dev->phy_mutex);

	sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
	sr_write_reg(dev, SR_EPCR, phy ? (EPCR_EPOS | EPCR_ERPRR) : EPCR_ERPRR);

	ret = wait_phy_eeprom_ready(dev, phy);
	if (ret < 0)
		goto out_unlock;

	sr_write_reg(dev, SR_EPCR, 0x0);
	ret = sr_read(dev, SR_EPDR, 2, value);

	netdev_dbg(dev->net, "read shared %d 0x%02x returned 0x%04x, %d\n",
		   phy, reg, *value, ret);

out_unlock:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 133 97.08% 1 50.00%
chen gang chen gang 4 2.92% 1 50.00%
Total 137 100.00% 2 100.00%



static int sr_share_write_word(struct usbnet *dev, int phy, u8 reg,
			       __le16 value)
{
	int ret;

	mutex_lock(&dev->phy_mutex);

	ret = sr_write(dev, SR_EPDR, 2, &value);
	if (ret < 0)
		goto out_unlock;

	sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
	sr_write_reg(dev, SR_EPCR, phy ? (EPCR_WEP | EPCR_EPOS | EPCR_ERPRW) :
		    (EPCR_WEP | EPCR_ERPRW));

	ret = wait_phy_eeprom_ready(dev, phy);
	if (ret < 0)
		goto out_unlock;

	sr_write_reg(dev, SR_EPCR, 0x0);

out_unlock:
	mutex_unlock(&dev->phy_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 130 97.01% 1 50.00%
chen gang chen gang 4 2.99% 1 50.00%
Total 134 100.00% 2 100.00%



static int sr_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
{
	return sr_share_read_word(dev, 0, offset, value);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%



static int sr9700_get_eeprom_len(struct net_device *netdev)
{
	return SR_EEPROM_LEN;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static int sr9700_get_eeprom(struct net_device *netdev,
			     struct ethtool_eeprom *eeprom, u8 *data)
{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 *buf = (__le16 *)data;
	int ret = 0;
	int i;

	/* access is 16bit */
	if ((eeprom->offset & 0x01) || (eeprom->len & 0x01))
		return -EINVAL;

	for (i = 0; i < eeprom->len / 2; i++) {
		ret = sr_read_eeprom_word(dev, eeprom->offset / 2 + i, buf + i);
		if (ret < 0)
			break;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 119 100.00% 1 100.00%
Total 119 100.00% 1 100.00%



static int sr_mdio_read(struct net_device *netdev, int phy_id, int loc)
{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res;
	int rc = 0;

	if (phy_id) {
		netdev_dbg(netdev, "Only internal phy supported\n");
		return 0;
	}

	/* Access NSR_LINKST bit for link status instead of MII_BMSR */
	if (loc == MII_BMSR) {
		u8 value;

		sr_read_reg(dev, SR_NSR, &value);
		if (value & NSR_LINKST)
			rc = 1;
	}
	sr_share_read_word(dev, 1, loc, &res);
	if (rc == 1)
		res = le16_to_cpu(res) | BMSR_LSTATUS;
	else
		res = le16_to_cpu(res) & ~BMSR_LSTATUS;

	netdev_dbg(netdev, "sr_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
		   phy_id, loc, res);

	return res;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 136 99.27% 1 50.00%
chen gang chen gang 1 0.73% 1 50.00%
Total 137 100.00% 2 100.00%



static void sr_mdio_write(struct net_device *netdev, int phy_id, int loc,
			  int val)
{
	struct usbnet *dev = netdev_priv(netdev);
	__le16 res = cpu_to_le16(val);

	if (phy_id) {
		netdev_dbg(netdev, "Only internal phy supported\n");
		return;
	}

	netdev_dbg(netdev, "sr_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
		   phy_id, loc, val);

	sr_share_write_word(dev, 1, loc, res);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 76 100.00% 1 100.00%
Total 76 100.00% 1 100.00%



static u32 sr9700_get_link(struct net_device *netdev)
{
	struct usbnet *dev = netdev_priv(netdev);
	u8 value = 0;
	int rc = 0;

	/* Get the Link Status directly */
	sr_read_reg(dev, SR_NSR, &value);
	if (value & NSR_LINKST)
		rc = 1;

	return rc;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 54 98.18% 1 50.00%
chen gang chen gang 1 1.82% 1 50.00%
Total 55 100.00% 2 100.00%



static int sr9700_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
{
	struct usbnet *dev = netdev_priv(netdev);

	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%


static const struct ethtool_ops sr9700_ethtool_ops = {
	.get_drvinfo	= usbnet_get_drvinfo,
	.get_link	= sr9700_get_link,
	.get_msglevel	= usbnet_get_msglevel,
	.set_msglevel	= usbnet_set_msglevel,
	.get_eeprom_len	= sr9700_get_eeprom_len,
	.get_eeprom	= sr9700_get_eeprom,
	.get_settings	= usbnet_get_settings,
	.set_settings	= usbnet_set_settings,
	.nway_reset	= usbnet_nway_reset,
};



static void sr9700_set_multicast(struct net_device *netdev)
{
	struct usbnet *dev = netdev_priv(netdev);
	/* We use the 20 byte dev->data for our 8 byte filter buffer
         * to avoid allocating memory that is tricky to free later
         */
	u8 *hashes = (u8 *)&dev->data;
	/* rx_ctl setting : enable, disable_long, disable_crc */
	u8 rx_ctl = RCR_RXEN | RCR_DIS_CRC | RCR_DIS_LONG;

	memset(hashes, 0x00, SR_MCAST_SIZE);
	/* broadcast address */
	hashes[SR_MCAST_SIZE - 1] |= SR_MCAST_ADDR_FLAG;
	if (netdev->flags & IFF_PROMISC) {
		rx_ctl |= RCR_PRMSC;
	} else if (netdev->flags & IFF_ALLMULTI ||
		   netdev_mc_count(netdev) > SR_MCAST_MAX) {
		rx_ctl |= RCR_RUNT;
	} else if (!netdev_mc_empty(netdev)) {
		struct netdev_hw_addr *ha;

		netdev_for_each_mc_addr(ha, netdev) {
			u32 crc = ether_crc(ETH_ALEN, ha->addr) >> 26;
			hashes[crc >> 3] |= 1 << (crc & 0x7);
		}
	}

	sr_write_async(dev, SR_MAR, SR_MCAST_SIZE, hashes);
	sr_write_reg_async(dev, SR_RCR, rx_ctl);
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 171 98.84% 1 50.00%
chen gang chen gang 2 1.16% 1 50.00%
Total 173 100.00% 2 100.00%



static int sr9700_set_mac_address(struct net_device *netdev, void *p)
{
	struct usbnet *dev = netdev_priv(netdev);
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data)) {
		netdev_err(netdev, "not setting invalid mac address %pM\n",
			   addr->sa_data);
		return -EINVAL;
	}

	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	sr_write_async(dev, SR_PAR, 6, netdev->dev_addr);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 89 98.89% 1 50.00%
chen gang chen gang 1 1.11% 1 50.00%
Total 90 100.00% 2 100.00%


static const struct net_device_ops sr9700_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		= sr9700_ioctl,
	.ndo_set_rx_mode	= sr9700_set_multicast,
	.ndo_set_mac_address	= sr9700_set_mac_address,
};



static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
{
	struct net_device *netdev;
	struct mii_if_info *mii;
	int ret;

	ret = usbnet_get_endpoints(dev, intf);
	if (ret)
		goto out;

	netdev = dev->net;

	netdev->netdev_ops = &sr9700_netdev_ops;
	netdev->ethtool_ops = &sr9700_ethtool_ops;
	netdev->hard_header_len += SR_TX_OVERHEAD;
	dev->hard_mtu = netdev->mtu + netdev->hard_header_len;
	/* bulkin buffer is preferably not less than 3K */
	dev->rx_urb_size = 3072;

	mii = &dev->mii;
	mii->dev = netdev;
	mii->mdio_read = sr_mdio_read;
	mii->mdio_write = sr_mdio_write;
	mii->phy_id_mask = 0x1f;
	mii->reg_num_mask = 0x1f;

	sr_write_reg(dev, SR_NCR, NCR_RST);
	udelay(20);

	/* read MAC
         * After Chip Power on, the Chip will reload the MAC from
         * EEPROM automatically to PAR. In case there is no EEPROM externally,
         * a default MAC address is stored in PAR for making chip work properly.
         */
	if (sr_read(dev, SR_PAR, ETH_ALEN, netdev->dev_addr) < 0) {
		netdev_err(netdev, "Error reading MAC address\n");
		ret = -ENODEV;
		goto out;
	}

	/* power up and reset phy */
	sr_write_reg(dev, SR_PRR, PRR_PHY_RST);
	/* at least 10ms, here 20ms for safe */
	mdelay(20);
	sr_write_reg(dev, SR_PRR, 0);
	/* at least 1ms, here 2ms for reading right register */
	udelay(2 * 1000);

	/* receive broadcast packets */
	sr9700_set_multicast(netdev);

	sr_mdio_write(netdev, mii->phy_id, MII_BMCR, BMCR_RESET);
	sr_mdio_write(netdev, mii->phy_id, MII_ADVERTISE, ADVERTISE_ALL |
		      ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
	mii_nway_restart(mii);

out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 251 98.43% 1 50.00%
chen gang chen gang 4 1.57% 1 50.00%
Total 255 100.00% 2 100.00%



static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
	struct sk_buff *sr_skb;
	int len;

	/* skb content (packets) format :
         *                    p0            p1            p2    ......    pm
         *                 /      \
         *            /                \
         *        /                            \
         *  /                                        \
         * p0b0 p0b1 p0b2 p0b3 ...... p0b(n-4) p0b(n-3)...p0bn
         *
         * p0 : packet 0
         * p0b0 : packet 0 byte 0
         *
         * b0: rx status
         * b1: packet length (incl crc) low
         * b2: packet length (incl crc) high
         * b3..n-4: packet data
         * bn-3..bn: ethernet packet crc
         */
	if (unlikely(skb->len < SR_RX_OVERHEAD)) {
		netdev_err(dev->net, "unexpected tiny rx frame\n");
		return 0;
	}

	/* one skb may contains multiple packets */
	while (skb->len > SR_RX_OVERHEAD) {
		if (skb->data[0] != 0x40)
			return 0;

		/* ignore the CRC length */
		len = (skb->data[1] | (skb->data[2] << 8)) - 4;

		if (len > ETH_FRAME_LEN)
			return 0;

		/* the last packet of current skb */
		if (skb->len == (len + SR_RX_OVERHEAD))	{
			skb_pull(skb, 3);
			skb->len = len;
			skb_set_tail_pointer(skb, len);
			skb->truesize = len + sizeof(struct sk_buff);
			return 2;
		}

		/* skb_clone is used for address align */
		sr_skb = skb_clone(skb, GFP_ATOMIC);
		if (!sr_skb)
			return 0;

		sr_skb->len = len;
		sr_skb->data = skb->data + 3;
		skb_set_tail_pointer(sr_skb, len);
		sr_skb->truesize = len + sizeof(struct sk_buff);
		usbnet_skb_return(dev, sr_skb);

		skb_pull(skb, len + SR_RX_OVERHEAD);
	};

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 232 100.00% 1 100.00%
Total 232 100.00% 1 100.00%



static struct sk_buff *sr9700_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
				       gfp_t flags)
{
	int len;

	/* SR9700 can only send out one ethernet packet at once.
         *
         * b0 b1 b2 b3 ...... b(n-4) b(n-3)...bn
         *
         * b0: rx status
         * b1: packet length (incl crc) low
         * b2: packet length (incl crc) high
         * b3..n-4: packet data
         * bn-3..bn: ethernet packet crc
         */

	len = skb->len;

	if (skb_headroom(skb) < SR_TX_OVERHEAD) {
		struct sk_buff *skb2;

		skb2 = skb_copy_expand(skb, SR_TX_OVERHEAD, 0, flags);
		dev_kfree_skb_any(skb);
		skb = skb2;
		if (!skb)
			return NULL;
	}

	__skb_push(skb, SR_TX_OVERHEAD);

	/* usbnet adds padding if length is a multiple of packet size
         * if so, adjust length value in header
         */
	if ((skb->len % dev->maxpacket) == 0)
		len++;

	skb->data[0] = len;
	skb->data[1] = len >> 8;

	return skb;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 125 100.00% 1 100.00%
Total 125 100.00% 1 100.00%



static void sr9700_status(struct usbnet *dev, struct urb *urb)
{
	int link;
	u8 *buf;

	/* format:
           b0: net status
           b1: tx status 1
           b2: tx status 2
           b3: rx status
           b4: rx overflow
           b5: rx count
           b6: tx count
           b7: gpr
        */

	if (urb->actual_length < 8)
		return;

	buf = urb->transfer_buffer;

	link = !!(buf[0] & 0x40);
	if (netif_carrier_ok(dev->net) != link) {
		usbnet_link_change(dev, link, 1);
		netdev_dbg(dev->net, "Link Status is: %d\n", link);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 85 100.00% 1 100.00%
Total 85 100.00% 1 100.00%



static int sr9700_link_reset(struct usbnet *dev)
{
	struct ethtool_cmd ecmd;

	mii_check_media(&dev->mii, 1, 1);
	mii_ethtool_gset(&dev->mii, &ecmd);

	netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
		   ecmd.speed, ecmd.duplex);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 58 100.00% 1 100.00%
Total 58 100.00% 1 100.00%


static const struct driver_info sr9700_driver_info = {
	.description	= "CoreChip SR9700 USB Ethernet",
	.flags		= FLAG_ETHER,
	.bind		= sr9700_bind,
	.rx_fixup	= sr9700_rx_fixup,
	.tx_fixup	= sr9700_tx_fixup,
	.status		= sr9700_status,
	.link_reset	= sr9700_link_reset,
	.reset		= sr9700_link_reset,
};


static const struct usb_device_id products[] = {
	{
		USB_DEVICE(0x0fe6, 0x9700),	/* SR9700 device */
		.driver_info = (unsigned long)&sr9700_driver_info,
        },
	{},			/* END */
};

MODULE_DEVICE_TABLE(usb, products);


static struct usb_driver sr9700_usb_driver = {
	.name		= "sr9700",
	.id_table	= products,
	.probe		= usbnet_probe,
	.disconnect	= usbnet_disconnect,
	.suspend	= usbnet_suspend,
	.resume		= usbnet_resume,
	.disable_hub_initiated_lpm = 1,
};


module_usb_driver(sr9700_usb_driver);

MODULE_AUTHOR("liujl <liujunliang_ljl@163.com>");
MODULE_DESCRIPTION("SR9700 one chip USB 1.1 USB to Ethernet device from http://www.corechip-sz.com/");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
liu junliang liu junliang 2404 99.26% 1 50.00%
chen gang chen gang 18 0.74% 1 50.00%
Total 2422 100.00% 2 100.00%
  Directory: drivers/net/usb

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
liu junliang	liu junliang	65	100.00%	1	100.00%
	Total	65	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/net/usb/sr9700.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
