[U-Boot] [PATCH v2 3/7] usb: eth: introduce support for Moschip USB ethernet

Gerhard Sittig
2014-02-17T19:35:23Z

introduce an 'mcs7830' driver for Moschip based USB ethernet adapters,
which was implemented based on the U-Boot Asix driver with additional
information gathered from the Moschip Linux driver

Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Gerhard Sittig <gsi@denx.de>
---
drivers/usb/eth/Makefile | 1 +
drivers/usb/eth/mcs7830.c | 850 +++++++++++++++++++++++++++++++++++++++++++
drivers/usb/eth/usb_ether.c | 7 +
include/usb_ether.h | 6 +
4 files changed, 864 insertions(+)
create mode 100644 drivers/usb/eth/mcs7830.c

diff --git a/drivers/usb/eth/Makefile b/drivers/usb/eth/Makefile
index 03f54749f720..94551c4c0c9a 100644
--- a/drivers/usb/eth/Makefile
+++ b/drivers/usb/eth/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_USB_HOST_ETHER) += usb_ether.o
ifdef CONFIG_USB_ETHER_ASIX
obj-y += asix.o
endif
+obj-$(CONFIG_USB_ETHER_MCS7830) += mcs7830.o
obj-$(CONFIG_USB_ETHER_SMSC95XX) += smsc95xx.o
diff --git a/drivers/usb/eth/mcs7830.c b/drivers/usb/eth/mcs7830.c
new file mode 100644
index 000000000000..991e2ee8f424
--- /dev/null
+++ b/drivers/usb/eth/mcs7830.c
@@ -0,0 +1,850 @@
+/*
+ * Copyright (c) 2013 Gerhard Sittig <gsi@denx.de>
+ * based on the U-Boot Asix driver as well as information
+ * from the Linux Moschip driver
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * MOSCHIP MCS7830 based (7730/7830/7832) USB 2.0 Ethernet Devices
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <linux/mii.h>
+#include <malloc.h>
+#include <usb.h>
+
+#include "usb_ether.h"
+
+#define MCS7830_BASE_NAME "mcs"
+
+#define USBCALL_TIMEOUT 1000
+#define LINKSTATUS_TIMEOUT 5000 /* link status, connect timeout */
+#define LINKSTATUS_TIMEOUT_RES 50 /* link status, resolution in msec */
+
+#define MCS7830_RX_URB_SIZE 2048
+
+/* command opcodes */
+#define MCS7830_WR_BREQ 0x0d
+#define MCS7830_RD_BREQ 0x0e
+
+/* register layout, numerical offset specs for USB API calls */
+struct mcs7830_regs {
+ uint8_t multicast_hashes[8];
+ uint8_t packet_gap[2];
+ uint8_t phy_data[2];
+ uint8_t phy_command[2];
+ uint8_t configuration;
+ uint8_t ether_address[6];
+ uint8_t frame_drop_count;
+ uint8_t pause_threshold;
+};
+#define REG_MULTICAST_HASH offsetof(struct mcs7830_regs, multicast_hashes)
+#define REG_PHY_DATA offsetof(struct mcs7830_regs, phy_data)
+#define REG_PHY_CMD offsetof(struct mcs7830_regs, phy_command)
+#define REG_CONFIG offsetof(struct mcs7830_regs, configuration)
+#define REG_ETHER_ADDR offsetof(struct mcs7830_regs, ether_address)
+#define REG_FRAME_DROP_COUNTER offsetof(struct mcs7830_regs, frame_drop_count)
+#define REG_PAUSE_THRESHOLD offsetof(struct mcs7830_regs, pause_threshold)
+
+/* bit masks and default values for the above registers */
+#define PHY_CMD1_READ BIT(6)
+#define PHY_CMD1_WRITE BIT(5)
+#define PHY_CMD1_PHYADDR BIT(0)
+
+#define PHY_CMD2_PEND BIT(7)
+#define PHY_CMD2_READY BIT(6)
+
+#define CONF_CFG BIT(7)
+#define CONF_SPEED100 BIT(6)
+#define CONF_FDX_ENABLE BIT(5)
+#define CONF_RXENABLE BIT(4)
+#define CONF_TXENABLE BIT(3)
+#define CONF_SLEEPMODE BIT(2)
+#define CONF_ALLMULTICAST BIT(1)
+#define CONF_PROMISCUOUS BIT(0)
+
+#define PAUSE_THRESHOLD_DEFAULT 0
+
+/* bit masks for the status byte which follows received ethernet frames */
+#define STAT_RX_FRAME_CORRECT BIT(5)
+#define STAT_RX_LARGE_FRAME BIT(4)
+#define STAT_RX_CRC_ERROR BIT(3)
+#define STAT_RX_ALIGNMENT_ERROR BIT(2)
+#define STAT_RX_LENGTH_ERROR BIT(1)
+#define STAT_RX_SHORT_FRAME BIT(0)
+
+/*
+ * struct mcs7830_private - private driver data for an individual adapter
+ * @config: shadow for the network adapter's configuration register
+ * @mchash: shadow for the network adapter's multicast hash registers
+ */
+struct mcs7830_private {
+ uint8_t config;
+ uint8_t mchash[8];
+};
+
+/*
+ * mcs7830_read_reg() - read a register of the network adapter
+ * @dev: network device to read from
+ * @idx: index of the register to start reading from
+ * @size: number of bytes to read
+ * @data: buffer to read into
+ * Return: zero upon success, negative upon error
+ */
+static int mcs7830_read_reg(struct ueth_data *dev, uint8_t idx,
+ uint16_t size, void *data)
+{
+ int len;
+ ALLOC_CACHE_ALIGN_BUFFER(uint8_t, buf, size);
+
+ debug("%s() idx=0x%04X sz=%d\n", __func__, idx, size);
+
+ len = usb_control_msg(dev->pusb_dev,
+ usb_rcvctrlpipe(dev->pusb_dev, 0),
+ MCS7830_RD_BREQ,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0, idx, buf, size,
+ USBCALL_TIMEOUT);
+ if (len != size) {
+ debug("%s() len=%d != sz=%d\n", __func__, len, size);
+ return -EIO;
+ }
+ memcpy(data, buf, size);
+ return 0;
+}
+
+/*
+ * mcs7830_write_reg() - write a register of the network adapter
+ * @dev: network device to write to
+ * @idx: index of the register to start writing to
+ * @size: number of bytes to write
+ * @data: buffer holding the data to write
+ * Return: zero upon success, negative upon error
+ */
+static int mcs7830_write_reg(struct ueth_data *dev, uint8_t idx,
+ uint16_t size, void *data)
+{
+ int len;
+ ALLOC_CACHE_ALIGN_BUFFER(uint8_t, buf, size);
+
+ debug("%s() idx=0x%04X sz=%d\n", __func__, idx, size);
+
+ memcpy(buf, data, size);
+ len = usb_control_msg(dev->pusb_dev,
+ usb_sndctrlpipe(dev->pusb_dev, 0),
+ MCS7830_WR_BREQ,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0, idx, buf, size,
+ USBCALL_TIMEOUT);
+ if (len != size) {
+ debug("%s() len=%d != sz=%d\n", __func__, len, size);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * mcs7830_phy_emit_wait() - emit PHY read/write access, wait for its execution
+ * @dev: network device to talk to
+ * @rwflag: PHY_CMD1_READ or PHY_CMD1_WRITE opcode
+ * @index: number of the PHY register to read or write
+ * Return: zero upon success, negative upon error
+ */
+static int mcs7830_phy_emit_wait(struct ueth_data *dev,
+ uint8_t rwflag, uint8_t index)
+{
+ int rc;
+ int retry;
+ uint8_t cmd[2];
+
+ /* send the PHY read/write request */
+ cmd[0] = rwflag | PHY_CMD1_PHYADDR;
+ cmd[1] = PHY_CMD2_PEND | (index & 0x1f);
+ rc = mcs7830_write_reg(dev, REG_PHY_CMD, sizeof(cmd), cmd);
+ if (rc < 0)
+ return rc;
+
+ /* wait for the response to become available (usually < 1ms) */
+ retry = 10;
+ do {
+ rc = mcs7830_read_reg(dev, REG_PHY_CMD, sizeof(cmd), cmd);
+ if (rc < 0)
+ return rc;
+ if (cmd[1] & PHY_CMD2_READY)
+ return 0;
+ if (!retry--)
+ return -ETIMEDOUT;
+ mdelay(1);
+ } while (1);
+ /* UNREACH */
+}
+
+/*
+ * mcs7830_read_phy() - read a PHY register of the network adapter
+ * @dev: network device to read from
+ * @index: index of the PHY register to read from
+ * Return: non-negative 16bit register content, negative upon error
+ */
+static int mcs7830_read_phy(struct ueth_data *dev, uint8_t index)
+{
+ int rc;
+ uint16_t val;
+
+ /* send the PHY read request */
+ /* issue the PHY read request and wait for its execution */
+ rc = mcs7830_phy_emit_wait(dev, PHY_CMD1_READ, index);
+ if (rc < 0)
+ return rc;
+
+ /* fetch the PHY data which was read */
+ rc = mcs7830_read_reg(dev, REG_PHY_DATA, sizeof(val), &val);
+ if (rc < 0)
+ return rc;
+ rc = le16_to_cpu(val);
+ debug("%s(%s, %d) => 0x%04X\n", __func__, dev->eth_dev.name, index, rc);
+ return rc;
+}
+
+/*
+ * mcs7830_write_phy() - write a PHY register of the network adapter
+ * @dev: network device to write to
+ * @index: index of the PHY register to write to
+ * @val: value to write to the PHY register
+ * Return: zero upon success, negative upon error
+ */
+static int mcs7830_write_phy(struct ueth_data *dev, uint8_t index, uint16_t val)
+{
+ int rc;
+
+ debug("%s(%s, %d, 0x%04X)\n", __func__, dev->eth_dev.name, index, val);
+
+ /* setup the PHY data which is to get written */
+ val = cpu_to_le16(val);
+ rc = mcs7830_write_reg(dev, REG_PHY_DATA, sizeof(val), &val);
+ if (rc < 0)
+ return rc;
+
+ /* issue the PHY write request and wait for its execution */
+ rc = mcs7830_phy_emit_wait(dev, PHY_CMD1_WRITE, index);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
+/*
+ * mcs7830_read_config() - read the network adapter's config register
+ * @eth: network device to read from
+ * Return: non-negative register content upon success, negative upon error
+ */
+static int __maybe_unused mcs7830_read_config(struct eth_device *eth)
+{
+ struct ueth_data *dev;
+ int rc;
+ uint8_t cfg;
+
+ debug("%s()\n", __func__);
+ dev = eth->priv;
+
+ rc = mcs7830_read_reg(dev, REG_CONFIG, sizeof(cfg), &cfg);
+ if (rc < 0) {
+ debug("reading config from adapter failed\n");
+ return rc;
+ }
+
+ debug("%s() reg=0x%02X [ %s %s %s %s %s %s %s %s ]\n",
+ __func__, cfg,
+ (cfg & CONF_CFG) ? "cfg" : "-",
+ (cfg & CONF_SPEED100) ? "100" : "-",
+ (cfg & CONF_FDX_ENABLE) ? "fdx" : "-",
+ (cfg & CONF_RXENABLE) ? "rx" : "-",
+ (cfg & CONF_TXENABLE) ? "tx" : "-",
+ (cfg & CONF_SLEEPMODE) ? "sleep" : "-",
+ (cfg & CONF_ALLMULTICAST) ? "multi" : "-",
+ (cfg & CONF_PROMISCUOUS) ? "promisc" : "-");
+ return cfg;
+}
+
+/*
+ * mcs7830_write_config() - write to the network adapter's config register
+ * @eth: network device to write to
+ * Return: zero upon success, negative upon error
+ *
+ * the data which gets written is taken from the shadow config register
+ * within the device driver's private data
+ */
+static int mcs7830_write_config(struct ueth_data *dev)
+{
+ struct mcs7830_private *priv;
+ int rc;
+
+ debug("%s()\n", __func__);
+ priv = dev->dev_priv;
+
+ rc = mcs7830_write_reg(dev, REG_CONFIG,
+ sizeof(priv->config), &priv->config);
+ if (rc < 0) {
+ debug("writing config to adapter failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * mcs7830_write_mchash() - write the network adapter's multicast filter
+ * @eth: network device to write to
+ * Return: zero upon success, negative upon error
+ *
+ * the data which gets written is taken from the shadow multicast hashes
+ * within the device driver's private data
+ */
+static int mcs7830_write_mchash(struct ueth_data *dev)
+{
+ struct mcs7830_private *priv;
+ int rc;
+
+ debug("%s()\n", __func__);
+ priv = dev->dev_priv;
+
+ rc = mcs7830_write_reg(dev, REG_MULTICAST_HASH,
+ sizeof(priv->mchash), &priv->mchash);
+ if (rc < 0) {
+ debug("writing multicast hash to adapter failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * mcs7830_set_autoneg() - setup and trigger ethernet link autonegotiation
+ * @eth: network device to run link negotiation on
+ * Return: zero upon success, negative upon error
+ *
+ * the routine advertises available media and starts autonegotiation
+ */
+static int mcs7830_set_autoneg(struct ueth_data *dev)
+{
+ int adv, flg;
+ int rc;
+
+ debug("%s()\n", __func__);
+
+ /*
+ * algorithm taken from the Linux driver, which took it from
+ * "the original mcs7830 version 1.4 driver":
+ *
+ * enable all media, reset BMCR, enable auto neg, restart
+ * auto neg while keeping the enable auto neg flag set
+ */
+
+ adv = ADVERTISE_PAUSE_CAP | ADVERTISE_ALL | ADVERTISE_CSMA;
+ rc = mcs7830_write_phy(dev, MII_ADVERTISE, adv);
+
+ flg = 0;
+ if (!rc)
+ rc = mcs7830_write_phy(dev, MII_BMCR, flg);
+
+ flg |= BMCR_ANENABLE;
+ if (!rc)
+ rc = mcs7830_write_phy(dev, MII_BMCR, flg);
+
+ flg |= BMCR_ANRESTART;
+ if (!rc)
+ rc = mcs7830_write_phy(dev, MII_BMCR, flg);
+
+ return rc;
+}
+
+/*
+ * mcs7830_get_rev() - identify a network adapter's chip revision
+ * @eth: network device to identify
+ * Return: non-negative number, reflecting the revision number
+ *
+ * currently, only "rev C and higher" and "below rev C" are needed, so
+ * the return value is #1 for "below rev C", and #2 for "rev C and above"
+ */
+static int mcs7830_get_rev(struct ueth_data *dev)
+{
+ uint8_t buf[2];
+ int rc;
+ int rev;
+
+ /* register 22 is readable in rev C and higher */
+ rc = mcs7830_read_reg(dev, REG_FRAME_DROP_COUNTER, sizeof(buf), buf);
+ if (rc < 0)
+ rev = 1;
+ else
+ rev = 2;
+ debug("%s() rc=%d, rev=%d\n", __func__, rc, rev);
+ return rev;
+}
+
+/*
+ * mcs7830_apply_fixup() - identify an adapter and potentially apply fixups
+ * @eth: network device to identify and apply fixups to
+ * Return: zero upon success (no errors emitted from here)
+ *
+ * this routine identifies the network adapter's chip revision, and applies
+ * fixups for known issues
+ */
+static int mcs7830_apply_fixup(struct ueth_data *dev)
+{
+ int rev;
+ int i;
+ uint8_t thr;
+
+ rev = mcs7830_get_rev(dev);
+ debug("%s() rev=%d\n", __func__, rev);
+
+ /*
+ * rev C requires setting the pause threshold (the Linux driver
+ * is inconsistent, the implementation does it for "rev C
+ * exactly", the introductory comment says "rev C and above")
+ */
+ if (rev == 2) {
+ debug("%s: applying rev C fixup\n", dev->eth_dev.name);
+ thr = PAUSE_THRESHOLD_DEFAULT;
+ for (i = 0; i < 2; i++) {
+ (void)mcs7830_write_reg(dev, REG_PAUSE_THRESHOLD,
+ sizeof(thr), &thr);
+ mdelay(1);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * mcs7830_basic_reset() - bring the network adapter into a known first state
+ * @eth: network device to act upon
+ * Return: zero upon success, negative upon error
+ *
+ * this routine initializes the network adapter such that subsequent invocations
+ * of the interface callbacks can exchange ethernet frames; link negotiation is
+ * triggered from here already and continues in background
+ */
+static int mcs7830_basic_reset(struct ueth_data *dev)
+{
+ struct mcs7830_private *priv;
+ int rc;
+
+ debug("%s()\n", __func__);
+ priv = dev->dev_priv;
+
+ /*
+ * comment from the respective Linux driver, which
+ * unconditionally sets the ALLMULTICAST flag as well:
+ * should not be needed, but does not work otherwise
+ */
+ priv->config = CONF_TXENABLE;
+ priv->config |= CONF_ALLMULTICAST;
+
+ rc = mcs7830_set_autoneg(dev);
+ if (rc < 0) {
+ error("setting autoneg failed\n");
+ return rc;
+ }
+
+ rc = mcs7830_write_mchash(dev);
+ if (rc < 0) {
+ error("failed to set multicast hash\n");
+ return rc;
+ }
+
+ rc = mcs7830_write_config(dev);
+ if (rc < 0) {
+ error("failed to set configuration\n");
+ return rc;
+ }
+
+ rc = mcs7830_apply_fixup(dev);
+ if (rc < 0) {
+ error("fixup application failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * mcs7830_read_mac() - read an ethernet adapter's MAC address
+ * @eth: network device to read from
+ * Return: zero upon success, negative upon error
+ *
+ * this routine fetches the MAC address stored within the ethernet adapter,
+ * and stores it in the ethernet interface's data structure
+ */
+static int mcs7830_read_mac(struct eth_device *eth)
+{
+ struct ueth_data *dev;
+ int rc;
+ uint8_t buf[ETH_ALEN];
+
+ debug("%s()\n", __func__);
+ dev = eth->priv;
+
+ rc = mcs7830_read_reg(dev, REG_ETHER_ADDR, ETH_ALEN, buf);
+ if (rc < 0) {
+ debug("reading MAC from adapter failed\n");
+ return rc;
+ }
+
+ memcpy(&eth->enetaddr[0], buf, ETH_ALEN);
+ return 0;
+}
+
+/*
+ * mcs7830_write_mac() - write an ethernet adapter's MAC address
+ * @eth: network device to write to
+ * Return: zero upon success, negative upon error
+ *
+ * this routine takes the MAC address from the ethernet interface's data
+ * structure, and writes it into the ethernet adapter such that subsequent
+ * exchange of ethernet frames uses this address
+ */
+static int mcs7830_write_mac(struct eth_device *eth)
+{
+ struct ueth_data *dev;
+ int rc;
+
+ debug("%s()\n", __func__);
+ dev = eth->priv;
+
+ if (sizeof(eth->enetaddr) != ETH_ALEN)
+ return -EINVAL;
+ rc = mcs7830_write_reg(dev, REG_ETHER_ADDR, ETH_ALEN, eth->enetaddr);
+ if (rc < 0) {
+ debug("writing MAC to adapter failed\n");
+ return rc;
+ }
+ return 0;
+}
+
+/*
+ * mcs7830_init() - network interface's init callback
+ * @eth: network device to initialize
+ * @bd: board information
+ * Return: zero upon success, negative upon error
+ *
+ * after initial setup during probe() and get_info(), this init() callback
+ * ensures that the link is up and subsequent send() and recv() calls can
+ * exchange ethernet frames
+ */
+static int mcs7830_init(struct eth_device *eth, bd_t *bd)
+{
+ struct ueth_data *dev;
+ int timeout;
+ int have_link;
+
+ debug("%s()\n", __func__);
+ dev = eth->priv;
+
+ timeout = 0;
+ do {
+ have_link = mcs7830_read_phy(dev, MII_BMSR) & BMSR_LSTATUS;
+ if (have_link)
+ break;
+ udelay(LINKSTATUS_TIMEOUT_RES * 1000);
+ timeout += LINKSTATUS_TIMEOUT_RES;
+ } while (timeout < LINKSTATUS_TIMEOUT);
+ if (!have_link) {
+ debug("ethernet link is down\n");
+ return -ETIMEDOUT;
+ }
+ return 0;
+}
+
+/*
+ * mcs7830_send() - network interface's send callback
+ * @eth: network device to send the frame from
+ * @packet: ethernet frame content
+ * @length: ethernet frame length
+ * Return: zero upon success, negative upon error
+ *
+ * this routine send an ethernet frame out of the network interface
+ */
+static int mcs7830_send(struct eth_device *eth, void *packet, int length)
+{
+ struct ueth_data *dev;
+ int rc;
+ int gotlen;
+ /* there is a status byte after the ethernet frame */
+ ALLOC_CACHE_ALIGN_BUFFER(uint8_t, buf, PKTSIZE + sizeof(uint8_t));
+
+ dev = eth->priv;
+
+ memcpy(buf, packet, length);
+ rc = usb_bulk_msg(dev->pusb_dev,
+ usb_sndbulkpipe(dev->pusb_dev, dev->ep_out),
+ &buf[0], length, &gotlen,
+ USBCALL_TIMEOUT);
+ debug("%s() TX want len %d, got len %d, rc %d\n",
+ __func__, length, gotlen, rc);
+ return rc;
+}
+
+/*
+ * mcs7830_recv() - network interface's recv callback
+ * @eth: network device to receive frames from
+ * Return: zero upon success, negative upon error
+ *
+ * this routine checks for available ethernet frames that the network
+ * interface might have received, and notifies the network stack
+ */
+static int mcs7830_recv(struct eth_device *eth)
+{
+ struct ueth_data *dev;
+ ALLOC_CACHE_ALIGN_BUFFER(uint8_t, buf, MCS7830_RX_URB_SIZE);
+ int rc, wantlen, gotlen;
+ uint8_t sts;
+
+ debug("%s()\n", __func__);
+ dev = eth->priv;
+
+ /* fetch input data from the adapter */
+ wantlen = MCS7830_RX_URB_SIZE;
+ rc = usb_bulk_msg(dev->pusb_dev,
+ usb_rcvbulkpipe(dev->pusb_dev, dev->ep_in),
+ &buf[0], wantlen, &gotlen,
+ USBCALL_TIMEOUT);
+ debug("%s() RX want len %d, got len %d, rc %d\n",
+ __func__, wantlen, gotlen, rc);
+ if (rc != 0) {
+ error("RX: failed to receive\n");
+ return rc;
+ }
+ if (gotlen > wantlen) {
+ error("RX: got too many bytes (%d)\n", gotlen);
+ return -EIO;
+ }
+
+ /*
+ * the bulk message that we received from USB contains exactly
+ * one ethernet frame and a trailing status byte
+ */
+ if (gotlen < sizeof(sts))
+ return -EIO;
+ gotlen -= sizeof(sts);
+ sts = buf[gotlen];
+
+ if (sts == STAT_RX_FRAME_CORRECT) {
+ debug("%s() got a frame, len=%d\n", __func__, gotlen);
+ NetReceive(buf, gotlen);
+ return 0;
+ }
+
+ debug("RX: frame error (sts 0x%02X, %s %s %s %s %s)\n",
+ sts,
+ (sts & STAT_RX_LARGE_FRAME) ? "large" : "-",
+ (sts & STAT_RX_LENGTH_ERROR) ? "length" : "-",
+ (sts & STAT_RX_SHORT_FRAME) ? "short" : "-",
+ (sts & STAT_RX_CRC_ERROR) ? "crc" : "-",
+ (sts & STAT_RX_ALIGNMENT_ERROR) ? "align" : "-");
+ return -EIO;
+}
+
+/*
+ * mcs7830_halt() - network interface's halt callback
+ * @eth: network device to cease operation of
+ * Return: none
+ *
+ * this routine is supposed to undo the effect of previous initialization and
+ * ethernet frames exchange; in this implementation it's a NOP
+ */
+static void mcs7830_halt(struct eth_device *eth)
+{
+ debug("%s()\n", __func__);
+}
+
+/*
+ * mcs7830_iface_idx - index of detected network interfaces
+ *
+ * this counter keeps track of identified supported interfaces,
+ * to assign unique names as more interfaces are found
+ */
+static int mcs7830_iface_idx;
+
+/*
+ * mcs7830_eth_before_probe() - network driver's before_probe callback
+ * Return: none
+ *
+ * this routine initializes driver's internal data in preparation of
+ * subsequent probe callbacks
+ */
+void mcs7830_eth_before_probe(void)
+{
+ mcs7830_iface_idx = 0;
+}
+
+/*
+ * struct mcs7830_dongle - description of a supported Moschip ethernet dongle
+ * @vendor: 16bit USB vendor identification
+ * @product: 16bit USB product identification
+ *
+ * this structure describes a supported USB ethernet dongle by means of the
+ * vendor and product codes found during USB enumeration; no flags are held
+ * here since all supported dongles have identical behaviour, and required
+ * fixups get determined@runtime, such that no manual configuration is
+ * needed
+ */
+struct mcs7830_dongle {
+ uint16_t vendor;
+ uint16_t product;
+};
+
+/*
+ * mcs7830_dongles - the list of supported Moschip based USB ethernet dongles
+ */
+static const struct mcs7830_dongle const mcs7830_dongles[] = {
+ { 0x9710, 0x7832, }, /* Moschip 7832 */
+ { 0x9710, 0x7830, }, /* Moschip 7830 */
+ { 0x9710, 0x7730, }, /* Moschip 7730 */
+ { 0x0df6, 0x0021, }, /* Sitecom LN 30 */
+};
+
+/*
+ * mcs7830_eth_probe() - network driver's probe callback
+ * @dev: detected USB device to check
+ * @ifnum: detected USB interface to check
+ * @ss: USB ethernet data structure to fill in upon match
+ * Return: #1 upon match, #0 upon mismatch or error
+ *
+ * this routine checks whether the found USB device is supported by
+ * this ethernet driver, and upon match fills in the USB ethernet
+ * data structure which later is passed to the get_info callback
+ */
+int mcs7830_eth_probe(struct usb_device *dev, unsigned int ifnum,
+ struct ueth_data *ss)
+{
+ struct usb_interface *iface;
+ struct usb_interface_descriptor *iface_desc;
+ int i;
+ struct mcs7830_private *priv;
+ int ep_in_found, ep_out_found, ep_intr_found;
+
+ debug("%s()\n", __func__);
+
+ /* iterate the list of supported dongles */
+ iface = &dev->config.if_desc[ifnum];
+ iface_desc = &iface->desc;
+ for (i = 0; i < ARRAY_SIZE(mcs7830_dongles); i++) {
+ if (dev->descriptor.idVendor == mcs7830_dongles[i].vendor &&
+ dev->descriptor.idProduct == mcs7830_dongles[i].product)
+ break;
+ }
+ if (i == ARRAY_SIZE(mcs7830_dongles))
+ return 0;
+ debug("detected USB ethernet device: %04X:%04X\n",
+ dev->descriptor.idVendor, dev->descriptor.idProduct);
+
+ /* fill in driver private data */
+ priv = calloc(1, sizeof(*priv));
+ if (!priv)
+ return 0;
+
+ /* fill in the ueth_data structure, attach private data */
+ memset(ss, 0, sizeof(*ss));
+ ss->ifnum = ifnum;
+ ss->pusb_dev = dev;
+ ss->subclass = iface_desc->bInterfaceSubClass;
+ ss->protocol = iface_desc->bInterfaceProtocol;
+ ss->dev_priv = priv;
+
+ /*
+ * a minimum of three endpoints is expected: in (bulk),
+ * out (bulk), and interrupt; ignore all others
+ */
+ ep_in_found = ep_out_found = ep_intr_found = 0;
+ for (i = 0; i < iface_desc->bNumEndpoints; i++) {
+ uint8_t eptype, epaddr;
+ bool is_input;
+
+ eptype = iface->ep_desc[i].bmAttributes;
+ eptype &= USB_ENDPOINT_XFERTYPE_MASK;
+
+ epaddr = iface->ep_desc[i].bEndpointAddress;
+ is_input = epaddr & USB_DIR_IN;
+ epaddr &= USB_ENDPOINT_NUMBER_MASK;
+
+ if (eptype == USB_ENDPOINT_XFER_BULK) {
+ if (is_input && !ep_in_found) {
+ ss->ep_in = epaddr;
+ ep_in_found++;
+ }
+ if (!is_input && !ep_out_found) {
+ ss->ep_out = epaddr;
+ ep_out_found++;
+ }
+ }
+
+ if (eptype == USB_ENDPOINT_XFER_INT) {
+ if (is_input && !ep_intr_found) {
+ ss->ep_int = epaddr;
+ ss->irqinterval = iface->ep_desc[i].bInterval;
+ ep_intr_found++;
+ }
+ }
+ }
+ debug("endpoints: in %d, out %d, intr %d\n",
+ ss->ep_in, ss->ep_out, ss->ep_int);
+
+ /* apply basic sanity checks */
+ if (usb_set_interface(dev, iface_desc->bInterfaceNumber, 0) ||
+ !ss->ep_in || !ss->ep_out || !ss->ep_int) {
+ debug("device probe incomplete\n");
+ return 0;
+ }
+
+ dev->privptr = ss;
+ return 1;
+}
+
+/*
+ * mcs7830_eth_get_info() - network driver's get_info callback
+ * @dev: detected USB device
+ * @ss: USB ethernet data structure filled in at probe()
+ * @eth: ethernet interface data structure to fill in
+ * Return: #1 upon success, #0 upon error
+ *
+ * this routine registers the mandatory init(), send(), recv(), and
+ * halt() callbacks with the ethernet interface, can register the
+ * optional write_hwaddr() callback with the ethernet interface,
+ * and initiates configuration of the interface such that subsequent
+ * calls to those callbacks results in network communication
+ */
+int mcs7830_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
+ struct eth_device *eth)
+{
+ debug("%s()\n", __func__);
+ if (!eth) {
+ debug("%s: missing parameter.\n", __func__);
+ return 0;
+ }
+
+ snprintf(eth->name, sizeof(eth->name), "%s%d",
+ MCS7830_BASE_NAME, mcs7830_iface_idx++);
+ eth->init = mcs7830_init;
+ eth->send = mcs7830_send;
+ eth->recv = mcs7830_recv;
+ eth->halt = mcs7830_halt;
+ eth->write_hwaddr = mcs7830_write_mac;
+ eth->priv = ss;
+
+ if (mcs7830_basic_reset(ss))
+ return 0;
+
+#ifdef DEBUG
+ (void)mcs7830_read_config(eth);
+#endif
+
+ if (mcs7830_read_mac(eth))
+ return 0;
+ debug("MAC %pM\n", eth->enetaddr);
+
+ return 1;
+}
diff --git a/drivers/usb/eth/usb_ether.c b/drivers/usb/eth/usb_ether.c
index 2c4126be3601..1dda54c2f116 100644
--- a/drivers/usb/eth/usb_ether.c
+++ b/drivers/usb/eth/usb_ether.c
@@ -30,6 +30,13 @@ static const struct usb_eth_prob_dev prob_dev[] = {
.get_info = asix_eth_get_info,
},
#endif
+#ifdef CONFIG_USB_ETHER_MCS7830
+ {
+ .before_probe = mcs7830_eth_before_probe,
+ .probe = mcs7830_eth_probe,
+ .get_info = mcs7830_eth_get_info,
+ },
+#endif
#ifdef CONFIG_USB_ETHER_SMSC95XX
{
.before_probe = smsc95xx_eth_before_probe,
diff --git a/include/usb_ether.h b/include/usb_ether.h
index 011ead7a364e..35700a21b59f 100644
--- a/include/usb_ether.h
+++ b/include/usb_ether.h
@@ -49,6 +49,12 @@ int asix_eth_probe(struct usb_device *dev, unsigned int ifnum,
int asix_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
struct eth_device *eth);

+void mcs7830_eth_before_probe(void);
+int mcs7830_eth_probe(struct usb_device *dev, unsigned int ifnum,
+ struct ueth_data *ss);
+int mcs7830_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
+ struct eth_device *eth);
+
void smsc95xx_eth_before_probe(void);
int smsc95xx_eth_probe(struct usb_device *dev, unsigned int ifnum,
struct ueth_data *ss);
--
1.7.10.4