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Diffstat (limited to 'drivers/net/usb/sr9700.c')
-rw-r--r--drivers/net/usb/sr9700.c483
1 files changed, 483 insertions, 0 deletions
diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
new file mode 100644
index 000000000..937e6fef3
--- /dev/null
+++ b/drivers/net/usb/sr9700.c
@@ -0,0 +1,483 @@
+/*
+ * 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/usb.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_MULTIPLE_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_SINGLE_REG, SR_REQ_WR_REG,
+ value, reg, NULL, 0);
+}
+
+static void sr_write_async(struct usbnet *dev, u8 reg, u16 length,
+ const void *data)
+{
+ usbnet_write_cmd_async(dev, SR_WR_MULTIPLE_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_SINGLE_REG, SR_REQ_WR_REG,
+ value, reg, NULL, 0);
+}
+
+static int wait_eeprom_ready(struct usbnet *dev)
+{
+ int i;
+
+ for (i = 0; i < SR_EEPROM_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, "eeprom write timed out!\n");
+
+ return -EIO;
+}
+
+static int sr_read_eeprom_word(struct usbnet *dev, u8 reg, __le16 *value)
+{
+ int ret;
+
+ mutex_lock(&dev->phy_mutex);
+
+ sr_write_reg(dev, SR_EPAR, reg);
+ sr_write_reg(dev, SR_EPCR, EPCR_ERPRR);
+
+ ret = wait_eeprom_ready(dev);
+ 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 eeprom 0x%02x returned 0x%04x, %d\n",
+ reg, *value, ret);
+
+out_unlock:
+ mutex_unlock(&dev->phy_mutex);
+ return ret;
+}
+
+static int __maybe_unused sr_write_eeprom_word(struct usbnet *dev, 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, reg);
+ sr_write_reg(dev, SR_EPCR, EPCR_WEP | EPCR_ERPRW);
+
+ ret = wait_eeprom_ready(dev);
+ if (ret < 0)
+ goto out_unlock;
+
+ sr_write_reg(dev, SR_EPCR, 0x0);
+
+out_unlock:
+ mutex_unlock(&dev->phy_mutex);
+ return ret;
+}
+
+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 void sr9700_handle_link_change(struct net_device *netdev, bool link)
+{
+ if (netif_carrier_ok(netdev) != link) {
+ if (link) {
+ netif_carrier_on(netdev);
+ netdev_info(netdev, "link up, 10Mbps, half-duplex\n");
+ } else {
+ netif_carrier_off(netdev);
+ netdev_info(netdev, "link down\n");
+ }
+ }
+}
+
+static u32 sr9700_get_link(struct net_device *netdev)
+{
+ struct usbnet *dev = netdev_priv(netdev);
+ u8 value = 0;
+ u32 link = 0;
+
+ sr_read_reg(dev, SR_NSR, &value);
+ link = !!(value & NSR_LINKST);
+
+ sr9700_handle_link_change(netdev, link);
+
+ return link;
+}
+
+/*
+ * The device supports only 10Mbps half-duplex operation. It implements the
+ * DM9601 speed/duplex status registers, but as the values are always the same,
+ * using them would add unnecessary complexity.
+ */
+static int sr9700_get_link_ksettings(struct net_device *dev,
+ struct ethtool_link_ksettings *cmd)
+{
+ ethtool_link_ksettings_zero_link_mode(cmd, supported);
+ ethtool_link_ksettings_add_link_mode(cmd, supported, 10baseT_Half);
+ ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
+
+ ethtool_link_ksettings_zero_link_mode(cmd, advertising);
+ ethtool_link_ksettings_add_link_mode(cmd, advertising, 10baseT_Half);
+ ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
+
+ cmd->base.speed = SPEED_10;
+ cmd->base.duplex = DUPLEX_HALF;
+ cmd->base.port = PORT_TP;
+ cmd->base.phy_address = 0;
+ cmd->base.autoneg = AUTONEG_DISABLE;
+
+ return 0;
+}
+
+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_link_ksettings = sr9700_get_link_ksettings,
+};
+
+static void sr9700_set_multicast(struct net_device *netdev)
+{
+ struct usbnet *dev = netdev_priv(netdev);
+ /* rx_ctl setting : enable, disable_long, disable_crc */
+ u8 rx_ctl = RCR_RXEN | RCR_DIS_CRC | RCR_DIS_LONG;
+
+ if (netdev->flags & IFF_PROMISC)
+ rx_ctl |= RCR_PRMSC;
+ else if (netdev->flags & IFF_ALLMULTI || !netdev_mc_empty(netdev))
+ /* The chip has no multicast filter */
+ rx_ctl |= RCR_ALL;
+
+ sr_write_reg_async(dev, SR_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;
+ }
+
+ eth_hw_addr_set(netdev, addr->sa_data);
+ sr_write_async(dev, SR_PAR, ETH_ALEN, 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_get_stats64 = dev_get_tstats64,
+ .ndo_validate_addr = eth_validate_addr,
+ .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;
+ u8 addr[ETH_ALEN];
+ 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;
+
+ 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, addr) < 0) {
+ netdev_err(netdev, "Error reading MAC address\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ eth_hw_addr_set(netdev, addr);
+
+ /* power up and reset phy */
+ sr_write_reg(dev, SR_PRR, PRR_PHY_RST);
+ /* at least 10ms, here 20ms for safe */
+ msleep(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);
+
+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 :
+ * p1 p2 p3 ...... pn
+ * / \
+ * / \
+ * / \
+ * / \
+ * p1b1 p1b2 p1b3 p1b4 ...... p1b(n-4) p1b(n-3)...p1bn
+ *
+ * p1 : packet 1
+ * p1b1 : packet 1 byte 1
+ *
+ * b1: rx status
+ * b2: packet length (incl crc) low
+ * b3: packet length (incl crc) high
+ * b4..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] != RSR_MF)
+ return 0;
+
+ /* ignore the CRC length */
+ len = (skb->data[1] | (skb->data[2] << 8)) - 4;
+
+ if (len > ETH_FRAME_LEN || len > skb->len || len < 0)
+ 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);
+ return 2;
+ }
+
+ sr_skb = netdev_alloc_skb_ip_align(dev->net, len);
+ if (!sr_skb)
+ return 0;
+
+ skb_put(sr_skb, len);
+ memcpy(sr_skb->data, skb->data + 3, len);
+ 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.
+ *
+ * b1 b2 b3 b4 ...... b(n-4) b(n-3)...bn
+ *
+ * b1: rx status
+ * b2: packet length (incl crc) low
+ * b3: packet length (incl crc) high
+ * b4..n-4: packet data
+ * bn-3..bn: ethernet packet crc
+ */
+
+ len = skb->len;
+
+ if (skb_cow_head(skb, SR_TX_OVERHEAD)) {
+ dev_kfree_skb_any(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)
+{
+ bool link;
+ u8 *buf;
+
+ /* format:
+ b1: net status
+ b2: tx status 1
+ b3: tx status 2
+ b4: rx status
+ b5: rx overflow
+ b6: rx count
+ b7: tx count
+ b8: gpr
+ */
+
+ if (urb->actual_length < 8)
+ return;
+
+ buf = urb->transfer_buffer;
+
+ link = !!(buf[0] & NSR_LINKST);
+ sr9700_handle_link_change(dev->net, link);
+}
+
+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,
+};
+
+static const struct usb_device_id products[] = {
+ {
+ USB_DEVICE(0x0fe6, 0x9700), /* SR9700 device */
+ .driver_info = (unsigned long)&sr9700_driver_info,
+ },
+ {
+ /* SR9700 with virtual driver CD-ROM - interface 0 is the CD-ROM device */
+ USB_DEVICE_INTERFACE_NUMBER(0x0fe6, 0x9702, 1),
+ .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");
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-30 07:39:10 +0000