USB2NET : SR9700 : One chip USB 1.1 USB2NET SR9700Device Driver Support

Signed-off-by: Liu Junliang <liujunliang_ljl@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 560 insertions, 0 deletions

diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
new file mode 100644
index 000000000000..7ec3e0ee0783
--- /dev/null
+++ b/drivers/net/usb/sr9700.c
@@ -0,0 +1,560 @@
+/*
+ * 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/init.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;
+}
+
+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;
+}
+
+static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
+{
+	return sr_read(dev, reg, 1, value);
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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, 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;
+}
+
+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, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
+	sr_write_reg(dev, 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, EPCR, 0x0);
+	ret = sr_read(dev, 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;
+}
+
+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, EPDR, 2, &value);
+	if (ret < 0)
+		goto out_unlock;
+
+	sr_write_reg(dev, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
+	sr_write_reg(dev, 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, EPCR, 0x0);
+
+out_unlock:
+	mutex_unlock(&dev->phy_mutex);
+	return ret;
+}
+
+static int sr_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
+{
+	return sr_share_read_word(dev, 0, offset, value);
+}
+
+static int sr9700_get_eeprom_len(struct net_device *netdev)
+{
+	return SR_EEPROM_LEN;
+}
+
+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;
+}
+
+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, 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;
+}
+
+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);
+}
+
+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, NSR, &value);
+	if (value & NSR_LINKST)
+		rc = 1;
+
+	return rc;
+}
+
+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);
+}
+
+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, MAR, SR_MCAST_SIZE, hashes);
+	sr_write_reg_async(dev, RCR, rx_ctl);
+}
+
+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, PAR, 6, netdev->dev_addr);
+
+	return 0;
+}
+
+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, 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, 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, PRR, PRR_PHY_RST);
+	/* at least 10ms, here 20ms for safe */
+	mdelay(20);
+	sr_write_reg(dev, 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;
+}
+
+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;
+}
+
+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;
+}
+
+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);
+	}
+}
+
+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;
+}
+
+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");