[PATCH v3 3/5] net: ax88796c: ASIX AX88796C SPI Ethernet Adapter Driver

Łukasz Stelmach
2020-10-21T21:50:12Z

ASIX AX88796[1] is a versatile ethernet adapter chip, that can be
connected to a CPU with a 8/16-bit bus or with an SPI. This driver
supports SPI connection.

The driver has been ported from the vendor kernel for ARTIK5[2]
boards. Several changes were made to adapt it to the current kernel
which include:

+ updated DT configuration,
+ clock configuration moved to DT,
+ new timer, ethtool and gpio APIs,
+ dev_* instead of pr_* and custom printk() wrappers,
+ removed awkward vendor power managemtn.

[1] https://www.asix.com.tw/products.php?op=pItemdetail&PItemID=104;65;86&PLine=65
[2] https://git.tizen.org/cgit/profile/common/platform/kernel/linux-3.10-artik/

The other ax88796 driver is for NE2000 compatible AX88796L chip. These
chips are not compatible. Hence, two separate drivers are required.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
---
MAINTAINERS | 6 +
drivers/net/ethernet/Kconfig | 1 +
drivers/net/ethernet/Makefile | 1 +
drivers/net/ethernet/asix/Kconfig | 22 +
drivers/net/ethernet/asix/Makefile | 6 +
drivers/net/ethernet/asix/ax88796c_ioctl.c | 197 ++++
drivers/net/ethernet/asix/ax88796c_ioctl.h | 27 +
drivers/net/ethernet/asix/ax88796c_main.c | 1144 ++++++++++++++++++++
drivers/net/ethernet/asix/ax88796c_main.h | 578 ++++++++++
drivers/net/ethernet/asix/ax88796c_spi.c | 111 ++
drivers/net/ethernet/asix/ax88796c_spi.h | 69 ++
11 files changed, 2162 insertions(+)
create mode 100644 drivers/net/ethernet/asix/Kconfig
create mode 100644 drivers/net/ethernet/asix/Makefile
create mode 100644 drivers/net/ethernet/asix/ax88796c_ioctl.c
create mode 100644 drivers/net/ethernet/asix/ax88796c_ioctl.h
create mode 100644 drivers/net/ethernet/asix/ax88796c_main.c
create mode 100644 drivers/net/ethernet/asix/ax88796c_main.h
create mode 100644 drivers/net/ethernet/asix/ax88796c_spi.c
create mode 100644 drivers/net/ethernet/asix/ax88796c_spi.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 14b8ec0bb58b..930dc859d4f7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2812,6 +2812,12 @@ S: Maintained
F: Documentation/hwmon/asc7621.rst
F: drivers/hwmon/asc7621.c

+ASIX AX88796C SPI ETHERNET ADAPTER
+M: Łukasz Stelmach <l.stelmach@samsung.com>
+S: Maintained
+F: Documentation/devicetree/bindings/net/asix,ax99706c-spi.yaml
+F: drivers/net/ethernet/asix/ax88796c_*
+
ASPEED PINCTRL DRIVERS
M: Andrew Jeffery <andrew@aj.id.au>
L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index de50e8b9e656..f3b218e45ea5 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -32,6 +32,7 @@ source "drivers/net/ethernet/apm/Kconfig"
source "drivers/net/ethernet/apple/Kconfig"
source "drivers/net/ethernet/aquantia/Kconfig"
source "drivers/net/ethernet/arc/Kconfig"
+source "drivers/net/ethernet/asix/Kconfig"
source "drivers/net/ethernet/atheros/Kconfig"
source "drivers/net/ethernet/aurora/Kconfig"
source "drivers/net/ethernet/broadcom/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index f8f38dcb5f8a..9eb368d93607 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_NET_XGENE) += apm/
obj-$(CONFIG_NET_VENDOR_APPLE) += apple/
obj-$(CONFIG_NET_VENDOR_AQUANTIA) += aquantia/
obj-$(CONFIG_NET_VENDOR_ARC) += arc/
+obj-$(CONFIG_NET_VENDOR_ASIX) += asix/
obj-$(CONFIG_NET_VENDOR_ATHEROS) += atheros/
obj-$(CONFIG_NET_VENDOR_AURORA) += aurora/
obj-$(CONFIG_NET_VENDOR_CADENCE) += cadence/
diff --git a/drivers/net/ethernet/asix/Kconfig b/drivers/net/ethernet/asix/Kconfig
new file mode 100644
index 000000000000..bc21c11bd9de
--- /dev/null
+++ b/drivers/net/ethernet/asix/Kconfig
@@ -0,0 +1,22 @@
+#
+# Asix network device configuration
+#
+
+config NET_VENDOR_ASIX
+ bool "Asix devices"
+ default y
+ help
+ If you have a network (Ethernet, non-USB, not NE2000 compatible)
+ interface based on a chip from ASIX, say Y.
+
+if NET_VENDOR_ASIX
+
+config SPI_AX88796C
+ tristate "Asix AX88796C-SPI support"
+ select PHYLIB
+ depends on SPI
+ depends on GPIOLIB
+ help
+ Say Y here if you intend to use ASIX AX88796C attached in SPI mode.
+
+endif # NET_VENDOR_ASIX
diff --git a/drivers/net/ethernet/asix/Makefile b/drivers/net/ethernet/asix/Makefile
new file mode 100644
index 000000000000..0bfbbb042634
--- /dev/null
+++ b/drivers/net/ethernet/asix/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the Asix network device drivers.
+#
+
+obj-$(CONFIG_SPI_AX88796C) += ax88796c.o
+ax88796c-y := ax88796c_main.o ax88796c_ioctl.o ax88796c_spi.o
diff --git a/drivers/net/ethernet/asix/ax88796c_ioctl.c b/drivers/net/ethernet/asix/ax88796c_ioctl.c
new file mode 100644
index 000000000000..4b373390dc2a
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_ioctl.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#define pr_fmt(fmt) "ax88796c: " fmt
+
+#include <linux/bitmap.h>
+#include <linux/iopoll.h>
+#include <linux/phy.h>
+#include <linux/netdevice.h>
+
+#include "ax88796c_main.h"
+#include "ax88796c_ioctl.h"
+
+static void
+ax88796c_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info)
+{
+ /* Inherit standard device info */
+ strncpy(info->driver, DRV_NAME, sizeof(info->driver));
+}
+
+static u32 ax88796c_get_msglevel(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ return ax_local->msg_enable;
+}
+
+static void ax88796c_set_msglevel(struct net_device *ndev, u32 level)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ ax_local->msg_enable = level;
+}
+
+static u32 ax88796c_ethtool_getmsglevel(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ return ax_local->msg_enable;
+}
+
+static void ax88796c_ethtool_setmsglevel(struct net_device *ndev, u32 level)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ ax_local->msg_enable = level;
+}
+
+static void
+ax88796c_get_pauseparam(struct net_device *ndev, struct ethtool_pauseparam *pause)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ pause->tx_pause = !!(ax_local->flowctrl & AX_FC_TX);
+ pause->rx_pause = !!(ax_local->flowctrl & AX_FC_RX);
+ pause->autoneg = (ax_local->flowctrl & AX_FC_ANEG) ?
+ AUTONEG_ENABLE :
+ AUTONEG_DISABLE;
+}
+
+static int
+ax88796c_set_pauseparam(struct net_device *ndev, struct ethtool_pauseparam *pause)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ int fc;
+
+ /* The following logic comes from phylink_ethtool_set_pauseparam() */
+ fc = pause->tx_pause ? AX_FC_TX : 0;
+ fc |= pause->rx_pause ? AX_FC_RX : 0;
+ fc |= pause->autoneg ? AX_FC_ANEG : 0;
+
+ ax_local->flowctrl = fc;
+
+ if (pause->autoneg) {
+ phy_set_asym_pause(ax_local->phydev, pause->tx_pause,
+ pause->rx_pause);
+ } else {
+ int maccr = 0;
+
+ phy_set_asym_pause(ax_local->phydev, 0, 0);
+ maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
+ maccr |= (ax_local->flowctrl & AX_FC_TX) ? MACCR_TXFC_ENABLE : 0;
+
+ mutex_lock(&ax_local->spi_lock);
+
+ maccr |= AX_READ(&ax_local->ax_spi, P0_MACCR) &
+ ~(MACCR_TXFC_ENABLE | MACCR_RXFC_ENABLE);
+ AX_WRITE(&ax_local->ax_spi, maccr, P0_MACCR);
+
+ mutex_unlock(&ax_local->spi_lock);
+ }
+
+ return 0;
+}
+
+static int ax88796c_get_regs_len(struct net_device *ndev)
+{
+ return AX88796C_REGDUMP_LEN + AX88796C_PHY_REGDUMP_LEN;
+}
+
+static void
+ax88796c_get_regs(struct net_device *ndev, struct ethtool_regs *regs, void *_p)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ u16 *p = _p;
+ int offset, i;
+
+ memset(p, 0, ax88796c_get_regs_len(ndev));
+
+ mutex_lock(&ax_local->spi_lock);
+
+ for (offset = 0; offset < AX88796C_REGDUMP_LEN; offset += 2) {
+ if (!test_bit(offset / 2, ax88796c_no_regs_mask))
+ *p = AX_READ(&ax_local->ax_spi, offset);
+ p++;
+ }
+
+ mutex_unlock(&ax_local->spi_lock);
+
+ for (i = 0; i < AX88796C_PHY_REGDUMP_LEN / 2; i++) {
+ *p = phy_read(ax_local->phydev, i);
+ p++;
+ }
+}
+
+int ax88796c_mdio_read(struct mii_bus *mdiobus, int phy_id, int loc)
+{
+ struct ax88796c_device *ax_local = mdiobus->priv;
+ int ret;
+
+ mutex_lock(&ax_local->spi_lock);
+ AX_WRITE(&ax_local->ax_spi, MDIOCR_RADDR(loc)
+ | MDIOCR_FADDR(phy_id) | MDIOCR_READ, P2_MDIOCR);
+
+ ret = read_poll_timeout(AX_READ, ret,
+ (ret != 0),
+ 0, jiffies_to_usecs(HZ / 100), false,
+ &ax_local->ax_spi, P2_MDIOCR);
+ if (!ret)
+ ret = AX_READ(&ax_local->ax_spi, P2_MDIODR);
+
+ mutex_unlock(&ax_local->spi_lock);
+
+ return ret;
+}
+
+int
+ax88796c_mdio_write(struct mii_bus *mdiobus, int phy_id, int loc, u16 val)
+{
+ struct ax88796c_device *ax_local = mdiobus->priv;
+ int ret;
+
+ mutex_lock(&ax_local->spi_lock);
+ AX_WRITE(&ax_local->ax_spi, val, P2_MDIODR);
+
+ AX_WRITE(&ax_local->ax_spi,
+ MDIOCR_RADDR(loc) | MDIOCR_FADDR(phy_id)
+ | MDIOCR_WRITE, P2_MDIOCR);
+
+ ret = read_poll_timeout(AX_READ, ret,
+ ((ret & MDIOCR_VALID) != 0), 0,
+ jiffies_to_usecs(HZ / 100), false,
+ &ax_local->ax_spi, P2_MDIOCR);
+ mutex_unlock(&ax_local->spi_lock);
+
+ return ret;
+}
+
+const struct ethtool_ops ax88796c_ethtool_ops = {
+ .get_drvinfo = ax88796c_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_msglevel = ax88796c_get_msglevel,
+ .set_msglevel = ax88796c_set_msglevel,
+ .get_link_ksettings = phy_ethtool_get_link_ksettings,
+ .set_link_ksettings = phy_ethtool_set_link_ksettings,
+ .nway_reset = phy_ethtool_nway_reset,
+ .get_msglevel = ax88796c_ethtool_getmsglevel,
+ .set_msglevel = ax88796c_ethtool_setmsglevel,
+ .get_pauseparam = ax88796c_get_pauseparam,
+ .set_pauseparam = ax88796c_set_pauseparam,
+ .get_regs_len = ax88796c_get_regs_len,
+ .get_regs = ax88796c_get_regs,
+};
+
+int ax88796c_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd)
+{
+ int ret;
+
+ ret = phy_mii_ioctl(ndev->phydev, ifr, cmd);
+
+ return ret;
+}
diff --git a/drivers/net/ethernet/asix/ax88796c_ioctl.h b/drivers/net/ethernet/asix/ax88796c_ioctl.h
new file mode 100644
index 000000000000..d478981bf995
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_ioctl.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#ifndef _AX88796C_IOCTL_H
+#define _AX88796C_IOCTL_H
+
+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+
+#include "ax88796c_main.h"
+
+extern const struct ethtool_ops ax88796c_ethtool_ops;
+
+bool ax88796c_check_power(const struct ax88796c_device *ax_local);
+bool ax88796c_check_power_and_wake(struct ax88796c_device *ax_local);
+void ax88796c_set_power_saving(struct ax88796c_device *ax_local, u8 ps_level);
+int ax88796c_mdio_read(struct mii_bus *mdiobus, int phy_id, int loc);
+int ax88796c_mdio_write(struct mii_bus *mdiobus, int phy_id, int loc, u16 val);
+void ax88796c_set_csums(struct ax88796c_device *ax_local);
+int ax88796c_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+
+#endif
diff --git a/drivers/net/ethernet/asix/ax88796c_main.c b/drivers/net/ethernet/asix/ax88796c_main.c
new file mode 100644
index 000000000000..7c2cf3982142
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_main.c
@@ -0,0 +1,1144 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#define pr_fmt(fmt) "ax88796c: " fmt
+
+#include "ax88796c_main.h"
+#include "ax88796c_ioctl.h"
+
+#include <linux/bitmap.h>
+#include <linux/etherdevice.h>
+#include <linux/iopoll.h>
+#include <linux/mdio.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/phy.h>
+#include <linux/spi/spi.h>
+
+static int comp;
+static int msg_enable = NETIF_MSG_PROBE |
+ NETIF_MSG_LINK |
+ /* NETIF_MSG_TIMER | */
+ /* NETIF_MSG_IFDOWN | */
+ /* NETIF_MSG_IFUP | */
+ NETIF_MSG_RX_ERR |
+ NETIF_MSG_TX_ERR |
+ /* NETIF_MSG_TX_QUEUED | */
+ /* NETIF_MSG_INTR | */
+ /* NETIF_MSG_TX_DONE | */
+ /* NETIF_MSG_RX_STATUS | */
+ /* NETIF_MSG_PKTDATA | */
+ /* NETIF_MSG_HW | */
+ /* NETIF_MSG_WOL | */
+ 0;
+
+static char *no_regs_list = "80018001,e1918001,8001a001,fc0d0000";
+unsigned long ax88796c_no_regs_mask[AX88796C_REGDUMP_LEN / (sizeof(unsigned long) * 8)];
+
+module_param(comp, int, 0444);
+MODULE_PARM_DESC(comp, "0=Non-Compression Mode, 1=Compression Mode");
+
+module_param(msg_enable, int, 0444);
+MODULE_PARM_DESC(msg_enable, "Message mask (see linux/netdevice.h for bitmap)");
+
+static int ax88796c_soft_reset(struct ax88796c_device *ax_local)
+{
+ u16 temp;
+ int ret;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ AX_WRITE(&ax_local->ax_spi, PSR_RESET, P0_PSR);
+ AX_WRITE(&ax_local->ax_spi, PSR_RESET_CLR, P0_PSR);
+
+ ret = read_poll_timeout(AX_READ, ret,
+ (ret & PSR_DEV_READY),
+ 0, jiffies_to_usecs(160 * HZ / 1000), false,
+ &ax_local->ax_spi, P0_PSR);
+ if (ret)
+ return ret;
+
+ temp = AX_READ(&ax_local->ax_spi, P4_SPICR);
+ if (ax_local->capabilities & AX_CAP_COMP) {
+ AX_WRITE(&ax_local->ax_spi,
+ (temp | SPICR_RCEN | SPICR_QCEN), P4_SPICR);
+ ax_local->ax_spi.comp = 1;
+ } else {
+ AX_WRITE(&ax_local->ax_spi,
+ (temp & ~(SPICR_RCEN | SPICR_QCEN)), P4_SPICR);
+ ax_local->ax_spi.comp = 0;
+ }
+
+ return 0;
+}
+
+static int ax88796c_reload_eeprom(struct ax88796c_device *ax_local)
+{
+ int ret;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ AX_WRITE(&ax_local->ax_spi, EECR_RELOAD, P3_EECR);
+
+ ret = read_poll_timeout(AX_READ, ret,
+ (ret & PSR_DEV_READY),
+ 0, jiffies_to_usecs(2 * HZ / 1000), false,
+ &ax_local->ax_spi, P0_PSR);
+ if (ret) {
+ dev_err(&ax_local->spi->dev,
+ "timeout waiting for reload eeprom\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ax88796c_set_hw_multicast(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ u16 rx_ctl = RXCR_AB;
+ int mc_count = netdev_mc_count(ndev);
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ memset(ax_local->multi_filter, 0, AX_MCAST_FILTER_SIZE);
+
+ if (ndev->flags & IFF_PROMISC) {
+ rx_ctl |= RXCR_PRO;
+
+ } else if (ndev->flags & IFF_ALLMULTI || mc_count > AX_MAX_MCAST) {
+ rx_ctl |= RXCR_AMALL;
+
+ } else if (mc_count == 0) {
+ /* just broadcast and directed */
+ } else {
+ u32 crc_bits;
+ int i;
+ struct netdev_hw_addr *ha;
+
+ netdev_for_each_mc_addr(ha, ndev) {
+ crc_bits = ether_crc(ETH_ALEN, ha->addr);
+ ax_local->multi_filter[crc_bits >> 29] |=
+ (1 << ((crc_bits >> 26) & 7));
+ }
+
+ for (i = 0; i < 4; i++) {
+ AX_WRITE(&ax_local->ax_spi,
+ ((ax_local->multi_filter[i * 2 + 1] << 8) |
+ ax_local->multi_filter[i * 2]), P3_MFAR(i));
+ }
+ }
+
+ AX_WRITE(&ax_local->ax_spi, rx_ctl, P2_RXCR);
+}
+
+static void ax88796c_set_mac_addr(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[4] << 8) |
+ (u16)ndev->dev_addr[5]), P3_MACASR0);
+ AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[2] << 8) |
+ (u16)ndev->dev_addr[3]), P3_MACASR1);
+ AX_WRITE(&ax_local->ax_spi, ((u16)(ndev->dev_addr[0] << 8) |
+ (u16)ndev->dev_addr[1]), P3_MACASR2);
+}
+
+static void ax88796c_load_mac_addr(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ u16 temp;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ /* Try the device tree first */
+ if (!eth_platform_get_mac_address(&ax_local->spi->dev, ndev->dev_addr) &&
+ is_valid_ether_addr(ndev->dev_addr)) {
+ if (netif_msg_probe(ax_local))
+ dev_info(&ax_local->spi->dev,
+ "MAC address read from device tree\n");
+ return;
+ }
+
+ /* Read the MAC address from AX88796C */
+ temp = AX_READ(&ax_local->ax_spi, P3_MACASR0);
+ ndev->dev_addr[5] = (u8)temp;
+ ndev->dev_addr[4] = (u8)(temp >> 8);
+
+ temp = AX_READ(&ax_local->ax_spi, P3_MACASR1);
+ ndev->dev_addr[3] = (u8)temp;
+ ndev->dev_addr[2] = (u8)(temp >> 8);
+
+ temp = AX_READ(&ax_local->ax_spi, P3_MACASR2);
+ ndev->dev_addr[1] = (u8)temp;
+ ndev->dev_addr[0] = (u8)(temp >> 8);
+
+ if (is_valid_ether_addr(ndev->dev_addr)) {
+ if (netif_msg_probe(ax_local))
+ dev_info(&ax_local->spi->dev,
+ "MAC address read from ASIX chip\n");
+ return;
+ }
+
+ /* Use random address if none found */
+ if (netif_msg_probe(ax_local))
+ dev_info(&ax_local->spi->dev, "Use random MAC address\n");
+ eth_hw_addr_random(ndev);
+}
+
+static void ax88796c_proc_tx_hdr(struct tx_pkt_info *info, u8 ip_summed)
+{
+ u16 pkt_len_bar = (~info->pkt_len & TX_HDR_SOP_PKTLENBAR);
+
+ /* Prepare SOP header */
+ info->sop.flags_len = info->pkt_len |
+ ((ip_summed == CHECKSUM_NONE) ||
+ (ip_summed == CHECKSUM_UNNECESSARY) ? TX_HDR_SOP_DICF : 0);
+
+ info->sop.seq_lenbar = ((info->seq_num << 11) & TX_HDR_SOP_SEQNUM)
+ | pkt_len_bar;
+ cpu_to_be16s(&info->sop.flags_len);
+ cpu_to_be16s(&info->sop.seq_lenbar);
+
+ /* Prepare Segment header */
+ info->seg.flags_seqnum_seglen = TX_HDR_SEG_FS | TX_HDR_SEG_LS
+ | info->pkt_len;
+
+ info->seg.eo_so_seglenbar = pkt_len_bar;
+
+ cpu_to_be16s(&info->seg.flags_seqnum_seglen);
+ cpu_to_be16s(&info->seg.eo_so_seglenbar);
+
+ /* Prepare EOP header */
+ info->eop.seq_len = ((info->seq_num << 11) &
+ TX_HDR_EOP_SEQNUM) | info->pkt_len;
+ info->eop.seqbar_lenbar = ((~info->seq_num << 11) &
+ TX_HDR_EOP_SEQNUMBAR) | pkt_len_bar;
+
+ cpu_to_be16s(&info->eop.seq_len);
+ cpu_to_be16s(&info->eop.seqbar_lenbar);
+}
+
+static int
+ax88796c_check_free_pages(struct ax88796c_device *ax_local, u8 need_pages)
+{
+ u8 free_pages;
+ u16 tmp;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ free_pages = AX_READ(&ax_local->ax_spi, P0_TFBFCR) & TX_FREEBUF_MASK;
+ if (free_pages < need_pages) {
+ /* schedule free page interrupt */
+ tmp = AX_READ(&ax_local->ax_spi, P0_TFBFCR)
+ & TFBFCR_SCHE_FREE_PAGE;
+ AX_WRITE(&ax_local->ax_spi, tmp | TFBFCR_TX_PAGE_SET |
+ TFBFCR_SET_FREE_PAGE(need_pages),
+ P0_TFBFCR);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static struct sk_buff *
+ax88796c_tx_fixup(struct net_device *ndev, struct sk_buff_head *q)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ struct sk_buff *skb, *tx_skb;
+ struct tx_pkt_info *info;
+ struct skb_data *entry;
+ int headroom;
+ int tailroom;
+ u8 need_pages;
+ u16 tol_len, pkt_len;
+ u8 padlen, seq_num;
+ u8 spi_len = ax_local->ax_spi.comp ? 1 : 4;
+
+ if (skb_queue_empty(q))
+ return NULL;
+
+ skb = skb_peek(q);
+ pkt_len = skb->len;
+ need_pages = (pkt_len + TX_OVERHEAD + 127) >> 7;
+ if (ax88796c_check_free_pages(ax_local, need_pages) != 0)
+ return NULL;
+
+ headroom = skb_headroom(skb);
+ tailroom = skb_tailroom(skb);
+ padlen = ((pkt_len + 3) & 0x7FC) - pkt_len;
+ tol_len = ((pkt_len + 3) & 0x7FC) +
+ TX_OVERHEAD + TX_EOP_SIZE + spi_len;
+ seq_num = ++ax_local->seq_num & 0x1F;
+
+ info = (struct tx_pkt_info *)skb->cb;
+ info->pkt_len = pkt_len;
+
+ if ((!skb_cloned(skb)) &&
+ (headroom >= (TX_OVERHEAD + spi_len)) &&
+ (tailroom >= (padlen + TX_EOP_SIZE))) {
+ info->seq_num = seq_num;
+ ax88796c_proc_tx_hdr(info, skb->ip_summed);
+
+ /* SOP and SEG header */
+ memcpy(skb_push(skb, TX_OVERHEAD), &info->sop, TX_OVERHEAD);
+
+ /* Write SPI TXQ header */
+ memcpy(skb_push(skb, spi_len), tx_cmd_buf, spi_len);
+
+ /* Make 32-bit alignment */
+ skb_put(skb, padlen);
+
+ /* EOP header */
+ memcpy(skb_put(skb, TX_EOP_SIZE), &info->eop, TX_EOP_SIZE);
+
+ tx_skb = skb;
+ skb_unlink(skb, q);
+ } else {
+ tx_skb = alloc_skb(tol_len, GFP_KERNEL);
+ if (!tx_skb)
+ return NULL;
+
+ /* Write SPI TXQ header */
+ memcpy(skb_put(tx_skb, spi_len), tx_cmd_buf, spi_len);
+
+ info->seq_num = seq_num;
+ ax88796c_proc_tx_hdr(info, skb->ip_summed);
+
+ /* SOP and SEG header */
+ memcpy(skb_put(tx_skb, TX_OVERHEAD),
+ &info->sop, TX_OVERHEAD);
+
+ /* Packet */
+ memcpy(skb_put(tx_skb, ((pkt_len + 3) & 0xFFFC)),
+ skb->data, pkt_len);
+
+ /* EOP header */
+ memcpy(skb_put(tx_skb, TX_EOP_SIZE),
+ &info->eop, TX_EOP_SIZE);
+
+ skb_unlink(skb, q);
+ dev_kfree_skb(skb);
+ }
+
+ entry = (struct skb_data *)tx_skb->cb;
+ memset(entry, 0, sizeof(*entry));
+ entry->len = pkt_len;
+
+ if (netif_msg_pktdata(ax_local)) {
+ char pfx[IFNAMSIZ + 7];
+
+ snprintf(pfx, sizeof(pfx), "%s: ", ndev->name);
+
+ netdev_info(ndev, "TX packet len %d, total len %d, seq %d\n",
+ pkt_len, tx_skb->len, seq_num);
+
+ netdev_info(ndev, " SPI Header:\n");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ tx_skb->data, 4, 0);
+
+ netdev_info(ndev, " TX SOP:\n");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ tx_skb->data + 4, TX_OVERHEAD, 0);
+
+ netdev_info(ndev, " TX packet:\n");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ tx_skb->data + 4 + TX_OVERHEAD,
+ tx_skb->len - TX_EOP_SIZE - 4 - TX_OVERHEAD, 0);
+
+ netdev_info(ndev, " TX EOP:\n");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ tx_skb->data + tx_skb->len - 4, 4, 0);
+ }
+
+ return tx_skb;
+}
+
+static int ax88796c_hard_xmit(struct ax88796c_device *ax_local)
+{
+ struct sk_buff *tx_skb;
+ struct skb_data *entry;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ tx_skb = ax88796c_tx_fixup(ax_local->ndev, &ax_local->tx_wait_q);
+
+ if (!tx_skb)
+ return 0;
+
+ entry = (struct skb_data *)tx_skb->cb;
+
+ AX_WRITE(&ax_local->ax_spi,
+ (TSNR_TXB_START | TSNR_PKT_CNT(1)), P0_TSNR);
+
+ axspi_write_txq(&ax_local->ax_spi, tx_skb->data, tx_skb->len);
+
+ if (((AX_READ(&ax_local->ax_spi, P0_TSNR) & TXNR_TXB_IDLE) == 0) ||
+ ((ISR_TXERR & AX_READ(&ax_local->ax_spi, P0_ISR)) != 0)) {
+ /* Ack tx error int */
+ AX_WRITE(&ax_local->ax_spi, ISR_TXERR, P0_ISR);
+
+ ax_local->stats.tx_dropped++;
+
+ netif_err(ax_local, tx_err, ax_local->ndev,
+ "TX FIFO error, re-initialize the TX bridge\n");
+
+ /* Reinitial tx bridge */
+ AX_WRITE(&ax_local->ax_spi, TXNR_TXB_REINIT |
+ AX_READ(&ax_local->ax_spi, P0_TSNR), P0_TSNR);
+ ax_local->seq_num = 0;
+ } else {
+ ax_local->stats.tx_packets++;
+ ax_local->stats.tx_bytes += entry->len;
+ }
+
+ entry->state = tx_done;
+ dev_kfree_skb(tx_skb);
+
+ return 1;
+}
+
+static int
+ax88796c_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ skb_queue_tail(&ax_local->tx_wait_q, skb);
+ if (skb_queue_len(&ax_local->tx_wait_q) > TX_QUEUE_HIGH_WATER) {
+ netif_err(ax_local, tx_queued, ndev,
+ "Too many TX packets in queue %d\n",
+ skb_queue_len(&ax_local->tx_wait_q));
+
+ netif_stop_queue(ndev);
+ }
+
+ set_bit(EVENT_TX, &ax_local->flags);
+ schedule_work(&ax_local->ax_work);
+
+ return NETDEV_TX_OK;
+}
+
+static void
+ax88796c_skb_return(struct ax88796c_device *ax_local, struct sk_buff *skb,
+ struct rx_header *rxhdr)
+{
+ struct net_device *ndev = ax_local->ndev;
+ int status;
+
+ do {
+ if (!(ndev->features & NETIF_F_RXCSUM))
+ break;
+
+ /* checksum error bit is set */
+ if ((rxhdr->flags & RX_HDR3_L3_ERR) ||
+ (rxhdr->flags & RX_HDR3_L4_ERR))
+ break;
+
+ /* Other types may be indicated by more than one bit. */
+ if ((rxhdr->flags & RX_HDR3_L4_TYPE_TCP) ||
+ (rxhdr->flags & RX_HDR3_L4_TYPE_UDP))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } while (0);
+
+ ax_local->stats.rx_packets++;
+ ax_local->stats.rx_bytes += skb->len;
+ skb->dev = ndev;
+
+ skb->truesize = skb->len + sizeof(struct sk_buff);
+ skb->protocol = eth_type_trans(skb, ax_local->ndev);
+
+ netif_info(ax_local, rx_status, ndev, "< rx, len %zu, type 0x%x\n",
+ skb->len + sizeof(struct ethhdr), skb->protocol);
+
+ status = netif_rx(skb);
+ if (status != NET_RX_SUCCESS)
+ netif_info(ax_local, rx_err, ndev,
+ "netif_rx status %d\n", status);
+}
+
+static void
+ax88796c_rx_fixup(struct ax88796c_device *ax_local, struct sk_buff *rx_skb)
+{
+ struct rx_header *rxhdr = (struct rx_header *)rx_skb->data;
+ struct net_device *ndev = ax_local->ndev;
+ u16 len;
+
+ be16_to_cpus(&rxhdr->flags_len);
+ be16_to_cpus(&rxhdr->seq_lenbar);
+ be16_to_cpus(&rxhdr->flags);
+
+ if ((((short)rxhdr->flags_len) & RX_HDR1_PKT_LEN) !=
+ (~((short)rxhdr->seq_lenbar) & 0x7FF)) {
+ netif_err(ax_local, rx_err, ndev, "Header error\n");
+
+ ax_local->stats.rx_frame_errors++;
+ kfree_skb(rx_skb);
+ return;
+ }
+
+ if ((rxhdr->flags_len & RX_HDR1_MII_ERR) ||
+ (rxhdr->flags_len & RX_HDR1_CRC_ERR)) {
+ netif_err(ax_local, rx_err, ndev, "CRC or MII error\n");
+
+ ax_local->stats.rx_crc_errors++;
+ kfree_skb(rx_skb);
+ return;
+ }
+
+ len = rxhdr->flags_len & RX_HDR1_PKT_LEN;
+ if (netif_msg_pktdata(ax_local)) {
+ char pfx[IFNAMSIZ + 7];
+
+ snprintf(pfx, sizeof(pfx), "%s: ", ndev->name);
+ netdev_info(ndev, "RX data, total len %d, packet len %d\n",
+ rx_skb->len, len);
+
+ netdev_info(ndev, " Dump RX packet header:");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ rx_skb->data, sizeof(*rxhdr), 0);
+
+ netdev_info(ndev, " Dump RX packet:");
+ print_hex_dump(KERN_INFO, pfx, DUMP_PREFIX_OFFSET, 16, 1,
+ rx_skb->data + sizeof(*rxhdr), len, 0);
+ }
+
+ skb_pull(rx_skb, sizeof(*rxhdr));
+ __pskb_trim(rx_skb, len);
+
+ return ax88796c_skb_return(ax_local, rx_skb, rxhdr);
+}
+
+static int ax88796c_receive(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ struct sk_buff *skb;
+ struct skb_data *entry;
+ u16 w_count, pkt_len;
+ u8 pkt_cnt;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ /* check rx packet and total word count */
+ AX_WRITE(&ax_local->ax_spi, AX_READ(&ax_local->ax_spi, P0_RTWCR)
+ | RTWCR_RX_LATCH, P0_RTWCR);
+
+ pkt_cnt = AX_READ(&ax_local->ax_spi, P0_RXBCR2) & RXBCR2_PKT_MASK;
+ if (!pkt_cnt)
+ return 0;
+
+ pkt_len = AX_READ(&ax_local->ax_spi, P0_RCPHR) & 0x7FF;
+
+ w_count = ((pkt_len + 6 + 3) & 0xFFFC) >> 1;
+
+ skb = alloc_skb((w_count * 2), GFP_ATOMIC);
+ if (!skb) {
+ AX_WRITE(&ax_local->ax_spi, RXBCR1_RXB_DISCARD, P0_RXBCR1);
+ return 0;
+ }
+ entry = (struct skb_data *)skb->cb;
+
+ AX_WRITE(&ax_local->ax_spi, RXBCR1_RXB_START | w_count, P0_RXBCR1);
+
+ axspi_read_rxq(&ax_local->ax_spi,
+ skb_put(skb, w_count * 2), skb->len);
+
+ /* Check if rx bridge is idle */
+ if ((AX_READ(&ax_local->ax_spi, P0_RXBCR2) & RXBCR2_RXB_IDLE) == 0) {
+ netif_err(ax_local, rx_err, ndev,
+ "Rx Bridge is not idle\n");
+ AX_WRITE(&ax_local->ax_spi, RXBCR2_RXB_REINIT, P0_RXBCR2);
+
+ entry->state = rx_err;
+ } else {
+ entry->state = rx_done;
+ }
+
+ AX_WRITE(&ax_local->ax_spi, ISR_RXPKT, P0_ISR);
+
+ ax88796c_rx_fixup(ax_local, skb);
+
+ return 1;
+}
+
+static int ax88796c_process_isr(struct ax88796c_device *ax_local)
+{
+ u16 isr;
+ u8 done = 0;
+ struct net_device *ndev = ax_local->ndev;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ isr = AX_READ(&ax_local->ax_spi, P0_ISR);
+ AX_WRITE(&ax_local->ax_spi, isr, P0_ISR);
+
+ netif_dbg(ax_local, intr, ndev, " ISR 0x%04x\n", isr);
+
+ if (isr & ISR_TXERR) {
+ netif_dbg(ax_local, intr, ndev, " TXERR interrupt\n");
+ AX_WRITE(&ax_local->ax_spi, TXNR_TXB_REINIT, P0_TSNR);
+ ax_local->seq_num = 0x1f;
+ }
+
+ if (isr & ISR_TXPAGES) {
+ netif_dbg(ax_local, intr, ndev, " TXPAGES interrupt\n");
+ set_bit(EVENT_TX, &ax_local->flags);
+ }
+
+ if (isr & ISR_LINK) {
+ netif_dbg(ax_local, intr, ndev, " Link change interrupt\n");
+ phy_mac_interrupt(ax_local->ndev->phydev);
+ }
+
+ if (isr & ISR_RXPKT) {
+ netif_dbg(ax_local, intr, ndev, " RX interrupt\n");
+ done = ax88796c_receive(ax_local->ndev);
+ }
+
+ return done;
+}
+
+static irqreturn_t ax88796c_interrupt(int irq, void *dev_instance)
+{
+ struct net_device *ndev = dev_instance;
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ if (!ndev) {
+ pr_err("irq %d for unknown device.\n", irq);
+ return IRQ_RETVAL(0);
+ }
+
+ disable_irq_nosync(irq);
+
+ netif_dbg(ax_local, intr, ndev, "Interrupt occurred\n");
+
+ set_bit(EVENT_INTR, &ax_local->flags);
+ schedule_work(&ax_local->ax_work);
+
+ return IRQ_HANDLED;
+}
+
+static void ax88796c_work(struct work_struct *work)
+{
+ struct ax88796c_device *ax_local =
+ container_of(work, struct ax88796c_device, ax_work);
+
+ mutex_lock(&ax_local->spi_lock);
+
+ if (test_bit(EVENT_SET_MULTI, &ax_local->flags)) {
+ ax88796c_set_hw_multicast(ax_local->ndev);
+ clear_bit(EVENT_SET_MULTI, &ax_local->flags);
+ }
+
+ if (test_bit(EVENT_INTR, &ax_local->flags)) {
+ AX_WRITE(&ax_local->ax_spi, IMR_MASKALL, P0_IMR);
+
+ while (1) {
+ if (!ax88796c_process_isr(ax_local))
+ break;
+ }
+
+ clear_bit(EVENT_INTR, &ax_local->flags);
+
+ AX_WRITE(&ax_local->ax_spi, IMR_DEFAULT, P0_IMR);
+
+ enable_irq(ax_local->ndev->irq);
+ }
+
+ if (test_bit(EVENT_TX, &ax_local->flags)) {
+ while (skb_queue_len(&ax_local->tx_wait_q)) {
+ if (!ax88796c_hard_xmit(ax_local))
+ break;
+ }
+
+ clear_bit(EVENT_TX, &ax_local->flags);
+
+ if (netif_queue_stopped(ax_local->ndev) &&
+ (skb_queue_len(&ax_local->tx_wait_q) < TX_QUEUE_LOW_WATER))
+ netif_wake_queue(ax_local->ndev);
+ }
+
+ mutex_unlock(&ax_local->spi_lock);
+}
+
+static struct net_device_stats *ax88796c_get_stats(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ return &ax_local->stats;
+}
+
+static void ax88796c_set_mac(struct ax88796c_device *ax_local)
+{
+ u16 maccr;
+
+ maccr = (ax_local->link) ? MACCR_RXEN : 0;
+
+ switch (ax_local->speed) {
+ case SPEED_100:
+ maccr |= MACCR_SPEED_100;
+ case SPEED_10:
+ case SPEED_UNKNOWN:
+ break;
+ default:
+ return;
+ }
+
+ switch (ax_local->duplex) {
+ case DUPLEX_FULL:
+ maccr |= MACCR_SPEED_100;
+ case DUPLEX_HALF:
+ case DUPLEX_UNKNOWN:
+ break;
+ default:
+ return;
+ }
+
+ if (ax_local->flowctrl & AX_FC_ANEG &&
+ ax_local->phydev->autoneg) {
+ maccr |= ax_local->pause ? MACCR_RXFC_ENABLE : 0;
+ maccr |= !ax_local->pause != !ax_local->asym_pause ?
+ MACCR_TXFC_ENABLE : 0;
+ } else {
+ maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
+ maccr |= (ax_local->flowctrl & AX_FC_TX) ? MACCR_TXFC_ENABLE : 0;
+ }
+
+ mutex_lock(&ax_local->spi_lock);
+
+ maccr |= AX_READ(&ax_local->ax_spi, P0_MACCR) &
+ ~(MACCR_DUPLEX_FULL | MACCR_SPEED_100 |
+ MACCR_TXFC_ENABLE | MACCR_RXFC_ENABLE);
+ AX_WRITE(&ax_local->ax_spi, maccr, P0_MACCR);
+
+ mutex_unlock(&ax_local->spi_lock);
+}
+
+static void ax88796c_handle_link_change(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ struct phy_device *phydev = ndev->phydev;
+ bool update = false;
+
+ if (phydev->link && (ax_local->speed != phydev->speed ||
+ ax_local->duplex != phydev->duplex ||
+ ax_local->pause != phydev->pause ||
+ ax_local->asym_pause != phydev->asym_pause)) {
+ ax_local->speed = phydev->speed;
+ ax_local->duplex = phydev->duplex;
+ ax_local->pause = phydev->pause;
+ ax_local->asym_pause = phydev->asym_pause;
+ update = true;
+ }
+
+ if (phydev->link != ax_local->link) {
+ if (!phydev->link) {
+ ax_local->speed = SPEED_UNKNOWN;
+ ax_local->duplex = DUPLEX_UNKNOWN;
+ }
+
+ ax_local->link = phydev->link;
+ update = true;
+ }
+
+ if (update)
+ ax88796c_set_mac(ax_local);
+
+ if (net_ratelimit())
+ phy_print_status(ndev->phydev);
+}
+
+static void ax88796c_set_csums(struct ax88796c_device *ax_local)
+{
+ struct net_device *ndev = ax_local->ndev;
+
+ WARN_ON(!mutex_is_locked(&ax_local->spi_lock));
+
+ if (ndev->features & NETIF_F_RXCSUM) {
+ AX_WRITE(&ax_local->ax_spi, COERCR0_DEFAULT, P4_COERCR0);
+ AX_WRITE(&ax_local->ax_spi, COERCR1_DEFAULT, P4_COERCR1);
+ } else {
+ AX_WRITE(&ax_local->ax_spi, 0, P4_COERCR0);
+ AX_WRITE(&ax_local->ax_spi, 0, P4_COERCR1);
+ }
+
+ if (ndev->features & NETIF_F_HW_CSUM) {
+ AX_WRITE(&ax_local->ax_spi, COETCR0_DEFAULT, P4_COETCR0);
+ AX_WRITE(&ax_local->ax_spi, COETCR1_TXPPPE, P4_COETCR1);
+ } else {
+ AX_WRITE(&ax_local->ax_spi, 0, P4_COETCR0);
+ AX_WRITE(&ax_local->ax_spi, 0, P4_COETCR1);
+ }
+}
+
+static int
+ax88796c_open(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ int ret;
+ unsigned long irq_flag = IRQF_SHARED;
+ int fc = AX_FC_NONE;
+
+ ret = request_irq(ndev->irq, ax88796c_interrupt,
+ irq_flag, ndev->name, ndev);
+ if (ret) {
+ netdev_err(ndev, "unable to get IRQ %d (errno=%d).\n",
+ ndev->irq, ret);
+ return ret;
+ }
+
+ mutex_lock(&ax_local->spi_lock);
+
+ ret = ax88796c_soft_reset(ax_local);
+ if (ret < 0) {
+ mutex_unlock(&ax_local->spi_lock);
+ return ret;
+ }
+ ax_local->seq_num = 0x1f;
+
+ ax88796c_set_mac_addr(ndev);
+ ax88796c_set_csums(ax_local);
+
+ /* Disable stuffing packet */
+ AX_WRITE(&ax_local->ax_spi,
+ AX_READ(&ax_local->ax_spi, P1_RXBSPCR)
+ & ~RXBSPCR_STUF_ENABLE, P1_RXBSPCR);
+
+ /* Enable RX packet process */
+ AX_WRITE(&ax_local->ax_spi, RPPER_RXEN, P1_RPPER);
+
+ AX_WRITE(&ax_local->ax_spi, AX_READ(&ax_local->ax_spi, P0_FER)
+ | FER_RXEN | FER_TXEN | FER_BSWAP | FER_IRQ_PULL, P0_FER);
+
+ /* Setup LED mode */
+ AX_WRITE(&ax_local->ax_spi,
+ (LCR_LED0_EN | LCR_LED0_DUPLEX | LCR_LED1_EN |
+ LCR_LED1_100MODE), P2_LCR0);
+ AX_WRITE(&ax_local->ax_spi,
+ (AX_READ(&ax_local->ax_spi, P2_LCR1) & LCR_LED2_MASK) |
+ LCR_LED2_EN | LCR_LED2_LINK, P2_LCR1);
+
+ /* Disable PHY auto-polling */
+ AX_WRITE(&ax_local->ax_spi, PCR_PHYID(AX88796C_PHY_ID), P2_PCR);
+
+ /* Enable MAC interrupts */
+ AX_WRITE(&ax_local->ax_spi, IMR_DEFAULT, P0_IMR);
+
+ mutex_unlock(&ax_local->spi_lock);
+
+ /* Setup flow-control configuration */
+ phy_support_asym_pause(ax_local->phydev);
+
+ if (ax_local->phydev->advertising &&
+ (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ ax_local->phydev->advertising) ||
+ linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+ ax_local->phydev->advertising)))
+ fc |= AX_FC_ANEG;
+
+ fc |= linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ ax_local->phydev->advertising) ? AX_FC_RX : 0;
+ fc |= (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ ax_local->phydev->advertising) !=
+ linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+ ax_local->phydev->advertising)) ? AX_FC_TX : 0;
+ ax_local->flowctrl = fc;
+
+ phy_start(ax_local->ndev->phydev);
+
+ netif_start_queue(ndev);
+
+ spi_message_init(&ax_local->ax_spi.rx_msg);
+
+ return 0;
+}
+
+static void ax88796c_free_skb_queue(struct sk_buff_head *q)
+{
+ struct sk_buff *skb;
+
+ while (q->qlen) {
+ skb = skb_dequeue(q);
+ kfree_skb(skb);
+ }
+}
+
+static int
+ax88796c_close(struct net_device *ndev)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+
+ netif_stop_queue(ndev);
+ phy_stop(ndev->phydev);
+
+ mutex_lock(&ax_local->spi_lock);
+
+ /* Disable MAC interrupts */
+ AX_WRITE(&ax_local->ax_spi, IMR_MASKALL, P0_IMR);
+ ax88796c_free_skb_queue(&ax_local->tx_wait_q);
+ ax88796c_soft_reset(ax_local);
+
+ mutex_unlock(&ax_local->spi_lock);
+
+ free_irq(ndev->irq, ndev);
+
+ return 0;
+}
+
+static int
+ax88796c_set_features(struct net_device *ndev, netdev_features_t features)
+{
+ struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
+ netdev_features_t changed = features ^ ndev->features;
+
+ if (!(changed & (NETIF_F_RXCSUM | NETIF_F_HW_CSUM)))
+ return 0;
+
+ ndev->features = features;
+
+ if (changed & (NETIF_F_RXCSUM | NETIF_F_HW_CSUM))
+ ax88796c_set_csums(ax_local);
+
+ return 0;
+}
+
+static const struct net_device_ops ax88796c_netdev_ops = {
+ .ndo_open = ax88796c_open,
+ .ndo_stop = ax88796c_close,
+ .ndo_start_xmit = ax88796c_start_xmit,
+ .ndo_get_stats = ax88796c_get_stats,
+ .ndo_do_ioctl = ax88796c_ioctl,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_set_features = ax88796c_set_features,
+};
+
+static int ax88796c_hard_reset(struct ax88796c_device *ax_local)
+{
+ struct device *dev = (struct device *)&ax_local->spi->dev;
+ struct gpio_desc *reset_gpio;
+
+ /* reset info */
+ reset_gpio = gpiod_get(dev, "reset", 0);
+ if (IS_ERR(reset_gpio)) {
+ dev_err(dev, "Could not get 'reset' GPIO: %ld", PTR_ERR(reset_gpio));
+ return PTR_ERR(reset_gpio);
+ }
+
+ /* set reset */
+ gpiod_direction_output(reset_gpio, 1);
+ msleep(100);
+ gpiod_direction_output(reset_gpio, 0);
+ gpiod_put(reset_gpio);
+ msleep(20);
+
+ return 0;
+}
+
+static int ax88796c_probe(struct spi_device *spi)
+{
+ struct net_device *ndev;
+ struct ax88796c_device *ax_local;
+ char phy_id[MII_BUS_ID_SIZE + 3];
+ int ret;
+ u16 temp;
+
+ ndev = devm_alloc_etherdev(&spi->dev, sizeof(*ax_local));
+ if (!ndev)
+ return -ENOMEM;
+
+ SET_NETDEV_DEV(ndev, &spi->dev);
+
+ ax_local = to_ax88796c_device(ndev);
+ memset(ax_local, 0, sizeof(*ax_local));
+
+ dev_set_drvdata(&spi->dev, ax_local);
+ ax_local->spi = spi;
+ ax_local->ax_spi.spi = spi;
+
+ ax_local->ndev = ndev;
+ ax_local->capabilities |= comp ? AX_CAP_COMP : 0;
+ ax_local->msg_enable = msg_enable;
+ mutex_init(&ax_local->spi_lock);
+
+ ax_local->mdiobus = devm_mdiobus_alloc(&spi->dev);
+ if (!ax_local->mdiobus)
+ return -ENOMEM;
+
+ ax_local->mdiobus->priv = ax_local;
+ ax_local->mdiobus->read = ax88796c_mdio_read;
+ ax_local->mdiobus->write = ax88796c_mdio_write;
+ ax_local->mdiobus->name = "ax88976c-mdiobus";
+ ax_local->mdiobus->phy_mask = ~BIT(AX88796C_PHY_ID);
+ ax_local->mdiobus->parent = &spi->dev;
+
+ snprintf(ax_local->mdiobus->id, MII_BUS_ID_SIZE,
+ "ax88796c-%s.%u", dev_name(&spi->dev), spi->chip_select);
+
+ ret = devm_mdiobus_register(&spi->dev, ax_local->mdiobus);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Could not register MDIO bus\n");
+ return ret;
+ }
+
+ if (netif_msg_probe(ax_local)) {
+ dev_info(&spi->dev, "AX88796C-SPI Configuration:\n");
+ dev_info(&spi->dev, " Compression : %s\n",
+ ax_local->capabilities & AX_CAP_COMP ? "ON" : "OFF");
+ }
+
+ ndev->irq = spi->irq;
+ ndev->netdev_ops = &ax88796c_netdev_ops;
+ ndev->ethtool_ops = &ax88796c_ethtool_ops;
+ ndev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ ndev->features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ ndev->hard_header_len += (TX_OVERHEAD + 4);
+
+ mutex_lock(&ax_local->spi_lock);
+
+ /* ax88796c gpio reset */
+ ax88796c_hard_reset(ax_local);
+
+ /* Reset AX88796C */
+ ret = ax88796c_soft_reset(ax_local);
+ if (ret < 0) {
+ ret = -ENODEV;
+ goto err;
+ }
+ /* Check board revision */
+ temp = AX_READ(&ax_local->ax_spi, P2_CRIR);
+ if ((temp & 0xF) != 0x0) {
+ dev_err(&spi->dev, "spi read failed: %d\n", temp);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ temp = AX_READ(&ax_local->ax_spi, P0_BOR);
+ if (temp == 0x1234) {
+ ax_local->plat_endian = PLAT_LITTLE_ENDIAN;
+ } else {
+ AX_WRITE(&ax_local->ax_spi, 0xFFFF, P0_BOR);
+ ax_local->plat_endian = PLAT_BIG_ENDIAN;
+ }
+
+ /*Reload EEPROM*/
+ ax88796c_reload_eeprom(ax_local);
+
+ ax88796c_load_mac_addr(ndev);
+
+ if (netif_msg_probe(ax_local))
+ dev_info(&spi->dev,
+ "irq %d, MAC addr %02X:%02X:%02X:%02X:%02X:%02X\n",
+ ndev->irq,
+ ndev->dev_addr[0], ndev->dev_addr[1],
+ ndev->dev_addr[2], ndev->dev_addr[3],
+ ndev->dev_addr[4], ndev->dev_addr[5]);
+
+ /* Disable power saving */
+ AX_WRITE(&ax_local->ax_spi, (AX_READ(&ax_local->ax_spi, P0_PSCR)
+ & PSCR_PS_MASK) | PSCR_PS_D0, P0_PSCR);
+
+ mutex_unlock(&ax_local->spi_lock);
+
+ INIT_WORK(&ax_local->ax_work, ax88796c_work);
+
+ skb_queue_head_init(&ax_local->tx_wait_q);
+
+ snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT,
+ ax_local->mdiobus->id, AX88796C_PHY_ID);
+ ax_local->phydev = phy_connect(ax_local->ndev, phy_id,
+ ax88796c_handle_link_change,
+ PHY_INTERFACE_MODE_MII);
+ if (IS_ERR(ax_local->phydev)) {
+ ret = PTR_ERR(ax_local->phydev);
+ goto err;
+ }
+ ax_local->phydev->irq = PHY_POLL;
+
+ ret = devm_register_netdev(&spi->dev, ndev);
+ if (ret) {
+ dev_err(&spi->dev, "failed to register a network device\n");
+ goto err_phy_dis;
+ }
+
+ netif_info(ax_local, probe, ndev, "%s %s registered\n",
+ dev_driver_string(&spi->dev),
+ dev_name(&spi->dev));
+ phy_attached_info(ax_local->phydev);
+
+ return 0;
+
+err_phy_dis:
+ phy_disconnect(ax_local->phydev);
+err:
+ return ret;
+}
+
+static int ax88796c_remove(struct spi_device *spi)
+{
+ struct ax88796c_device *ax_local = dev_get_drvdata(&spi->dev);
+ struct net_device *ndev = ax_local->ndev;
+
+ phy_disconnect(ndev->phydev);
+
+ netif_info(ax_local, probe, ndev, "removing network device %s %s\n",
+ dev_driver_string(&spi->dev),
+ dev_name(&spi->dev));
+
+ return 0;
+}
+
+static const struct of_device_id ax88796c_dt_ids[] = {
+ { .compatible = "asix,ax88796c" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ax88796c_dt_ids);
+
+static const struct spi_device_id asix_id[] = {
+ { "ax88796c", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, asix_id);
+
+static struct spi_driver ax88796c_spi_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = of_match_ptr(ax88796c_dt_ids),
+ },
+ .probe = ax88796c_probe,
+ .remove = ax88796c_remove,
+ .id_table = asix_id,
+};
+
+static __init int ax88796c_spi_init(void)
+{
+ int ret;
+
+ bitmap_zero(ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
+ ret = bitmap_parse(no_regs_list, 35,
+ ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
+ if (ret) {
+ bitmap_fill(ax88796c_no_regs_mask, AX88796C_REGDUMP_LEN);
+ pr_err("Invalid bitmap description, masking all registers\n");
+ }
+
+ return spi_register_driver(&ax88796c_spi_driver);
+}
+
+static __exit void ax88796c_spi_exit(void)
+{
+ spi_unregister_driver(&ax88796c_spi_driver);
+}
+
+module_init(ax88796c_spi_init);
+module_exit(ax88796c_spi_exit);
+
+MODULE_AUTHOR("ASIX");
+MODULE_DESCRIPTION("ASIX AX88796C SPI Ethernet driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/asix/ax88796c_main.h b/drivers/net/ethernet/asix/ax88796c_main.h
new file mode 100644
index 000000000000..8a708039249b
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_main.h
@@ -0,0 +1,578 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#ifndef _AX88796C_MAIN_H
+#define _AX88796C_MAIN_H
+
+#include <linux/netdevice.h>
+#include <linux/mii.h>
+
+#include "ax88796c_spi.h"
+
+/* These identify the driver base version and may not be removed. */
+#define DRV_NAME "ax88796c"
+#define ADP_NAME "ASIX AX88796C SPI Ethernet Adapter"
+
+#define TX_QUEUE_HIGH_WATER 45 /* Tx queue high water mark */
+#define TX_QUEUE_LOW_WATER 20 /* Tx queue low water mark */
+
+#define AX88796C_REGDUMP_LEN 256
+#define AX88796C_PHY_REGDUMP_LEN 14
+#define AX88796C_PHY_ID 0x10
+
+#define TX_OVERHEAD 8
+#define TX_EOP_SIZE 4
+
+#define AX_MCAST_FILTER_SIZE 8
+#define AX_MAX_MCAST 64
+#define AX_MAX_CLK 80000000
+#define TX_HDR_SOP_DICF 0x8000
+#define TX_HDR_SOP_CPHI 0x4000
+#define TX_HDR_SOP_INT 0x2000
+#define TX_HDR_SOP_MDEQ 0x1000
+#define TX_HDR_SOP_PKTLEN 0x07FF
+#define TX_HDR_SOP_SEQNUM 0xF800
+#define TX_HDR_SOP_PKTLENBAR 0x07FF
+
+#define TX_HDR_SEG_FS 0x8000
+#define TX_HDR_SEG_LS 0x4000
+#define TX_HDR_SEG_SEGNUM 0x3800
+#define TX_HDR_SEG_SEGLEN 0x0700
+#define TX_HDR_SEG_EOFST 0xC000
+#define TX_HDR_SEG_SOFST 0x3800
+#define TX_HDR_SEG_SEGLENBAR 0x07FF
+
+#define TX_HDR_EOP_SEQNUM 0xF800
+#define TX_HDR_EOP_PKTLEN 0x07FF
+#define TX_HDR_EOP_SEQNUMBAR 0xF800
+#define TX_HDR_EOP_PKTLENBAR 0x07FF
+
+/* Rx header fields mask */
+#define RX_HDR1_MCBC 0x8000
+#define RX_HDR1_STUFF_PKT 0x4000
+#define RX_HDR1_MII_ERR 0x2000
+#define RX_HDR1_CRC_ERR 0x1000
+#define RX_HDR1_PKT_LEN 0x07FF
+
+#define RX_HDR2_SEQ_NUM 0xF800
+#define RX_HDR2_PKT_LEN_BAR 0x7FFF
+
+#define RX_HDR3_PE 0x8000
+#define RX_HDR3_L3_TYPE_IPV4V6 0x6000
+#define RX_HDR3_L3_TYPE_IP 0x4000
+#define RX_HDR3_L3_TYPE_IPV6 0x2000
+#define RX_HDR3_L4_TYPE_ICMPV6 0x1400
+#define RX_HDR3_L4_TYPE_TCP 0x1000
+#define RX_HDR3_L4_TYPE_IGMP 0x0c00
+#define RX_HDR3_L4_TYPE_ICMP 0x0800
+#define RX_HDR3_L4_TYPE_UDP 0x0400
+#define RX_HDR3_L3_ERR 0x0200
+#define RX_HDR3_L4_ERR 0x0100
+#define RX_HDR3_PRIORITY(x) ((x) << 4)
+#define RX_HDR3_STRIP 0x0008
+#define RX_HDR3_VLAN_ID 0x0007
+
+enum watchdog_state {
+ chk_link = 0,
+ chk_cable,
+ ax_nop,
+};
+
+struct ax88796c_device {
+ struct resource *addr_res; /* resources found */
+ struct resource *addr_req; /* resources requested */
+ struct resource *irq_res;
+
+ struct spi_device *spi;
+ struct net_device *ndev;
+ struct net_device_stats stats;
+
+ struct timer_list watchdog;
+ enum watchdog_state w_state;
+ size_t w_ticks;
+
+ struct work_struct ax_work;
+
+ struct mutex spi_lock; /* device access */
+
+ struct sk_buff_head tx_wait_q;
+
+ struct axspi_data ax_spi;
+
+ struct mii_bus *mdiobus;
+ struct phy_device *phydev;
+
+ int msg_enable;
+
+ u16 seq_num;
+
+ u8 multi_filter[AX_MCAST_FILTER_SIZE];
+
+ int link;
+ int speed;
+ int duplex;
+ int pause;
+ int asym_pause;
+ int flowctrl;
+ #define AX_FC_NONE 0
+ #define AX_FC_RX BIT(0)
+ #define AX_FC_TX BIT(1)
+ #define AX_FC_ANEG BIT(2)
+
+ unsigned long capabilities;
+ #define AX_CAP_DMA BIT(0)
+ #define AX_CAP_COMP BIT(1)
+ #define AX_CAP_BIDIR BIT(2)
+
+ u8 plat_endian;
+ #define PLAT_LITTLE_ENDIAN 0
+ #define PLAT_BIG_ENDIAN 1
+
+ unsigned long flags;
+ #define EVENT_INTR BIT(0)
+ #define EVENT_TX BIT(1)
+ #define EVENT_SET_MULTI BIT(2)
+
+};
+
+#define to_ax88796c_device(ndev) ((struct ax88796c_device *)netdev_priv(ndev))
+
+enum skb_state {
+ illegal = 0,
+ tx_done,
+ rx_done,
+ rx_err,
+};
+
+struct skb_data {
+ enum skb_state state;
+ struct net_device *ndev;
+ struct sk_buff *skb;
+ size_t len;
+ dma_addr_t phy_addr;
+};
+
+/* A88796C register definition */
+ /* Definition of PAGE0 */
+#define P0_PSR (0x00)
+ #define PSR_DEV_READY BIT(7)
+ #define PSR_RESET (0 << 15)
+ #define PSR_RESET_CLR BIT(15)
+#define P0_BOR (0x02)
+#define P0_FER (0x04)
+ #define FER_IPALM BIT(0)
+ #define FER_DCRC BIT(1)
+ #define FER_RH3M BIT(2)
+ #define FER_HEADERSWAP BIT(7)
+ #define FER_WSWAP BIT(8)
+ #define FER_BSWAP BIT(9)
+ #define FER_INTHI BIT(10)
+ #define FER_INTLO (0 << 10)
+ #define FER_IRQ_PULL BIT(11)
+ #define FER_RXEN BIT(14)
+ #define FER_TXEN BIT(15)
+#define P0_ISR (0x06)
+ #define ISR_RXPKT BIT(0)
+ #define ISR_MDQ BIT(4)
+ #define ISR_TXT BIT(5)
+ #define ISR_TXPAGES BIT(6)
+ #define ISR_TXERR BIT(8)
+ #define ISR_LINK BIT(9)
+#define P0_IMR (0x08)
+ #define IMR_RXPKT BIT(0)
+ #define IMR_MDQ BIT(4)
+ #define IMR_TXT BIT(5)
+ #define IMR_TXPAGES BIT(6)
+ #define IMR_TXERR BIT(8)
+ #define IMR_LINK BIT(9)
+ #define IMR_MASKALL (0xFFFF)
+ #define IMR_DEFAULT (IMR_TXERR)
+#define P0_WFCR (0x0A)
+ #define WFCR_PMEIND BIT(0) /* PME indication */
+ #define WFCR_PMETYPE BIT(1) /* PME I/O type */
+ #define WFCR_PMEPOL BIT(2) /* PME polarity */
+ #define WFCR_PMERST BIT(3) /* Reset PME */
+ #define WFCR_SLEEP BIT(4) /* Enable sleep mode */
+ #define WFCR_WAKEUP BIT(5) /* Enable wakeup mode */
+ #define WFCR_WAITEVENT BIT(6) /* Reserved */
+ #define WFCR_CLRWAKE BIT(7) /* Clear wakeup */
+ #define WFCR_LINKCH BIT(8) /* Enable link change */
+ #define WFCR_MAGICP BIT(9) /* Enable magic packet */
+ #define WFCR_WAKEF BIT(10) /* Enable wakeup frame */
+ #define WFCR_PMEEN BIT(11) /* Enable PME pin */
+ #define WFCR_LINKCHS BIT(12) /* Link change status */
+ #define WFCR_MAGICPS BIT(13) /* Magic packet status */
+ #define WFCR_WAKEFS BIT(14) /* Wakeup frame status */
+ #define WFCR_PMES BIT(15) /* PME pin status */
+#define P0_PSCR (0x0C)
+ #define PSCR_PS_MASK (0xFFF0)
+ #define PSCR_PS_D0 (0)
+ #define PSCR_PS_D1 BIT(0)
+ #define PSCR_PS_D2 BIT(1)
+ #define PSCR_FPS BIT(3) /* Enable fiber mode PS */
+ #define PSCR_SWPS BIT(4) /* Enable software */
+ /* PS control */
+ #define PSCR_WOLPS BIT(5) /* Enable WOL PS */
+ #define PSCR_SWWOL BIT(6) /* Enable software select */
+ /* WOL PS */
+ #define PSCR_PHYOSC BIT(7) /* Internal PHY OSC control */
+ #define PSCR_FOFEF BIT(8) /* Force PHY generate FEF */
+ #define PSCR_FOF BIT(9) /* Force PHY in fiber mode */
+ #define PSCR_PHYPD BIT(10) /* PHY power down. */
+ /* Active high */
+ #define PSCR_PHYRST BIT(11) /* PHY reset signal. */
+ /* Active low */
+ #define PSCR_PHYCSIL BIT(12) /* PHY cable energy detect */
+ #define PSCR_PHYCOFF BIT(13) /* PHY cable off */
+ #define PSCR_PHYLINK BIT(14) /* PHY link status */
+ #define PSCR_EEPOK BIT(15) /* EEPROM load complete */
+#define P0_MACCR (0x0E)
+ #define MACCR_RXEN BIT(0) /* Enable RX */
+ #define MACCR_DUPLEX_FULL BIT(1) /* 1: Full, 0: Half */
+ #define MACCR_SPEED_100 BIT(2) /* 1: 100Mbps, 0: 10Mbps */
+ #define MACCR_RXFC_ENABLE BIT(3)
+ #define MACCR_RXFC_MASK 0xFFF7
+ #define MACCR_TXFC_ENABLE BIT(4)
+ #define MACCR_TXFC_MASK 0xFFEF
+ #define MACCR_PSI BIT(6) /* Software Cable-Off */
+ /* Power Saving Interrupt */
+ #define MACCR_PF BIT(7)
+ #define MACCR_PMM_BITS 8
+ #define MACCR_PMM_MASK (0x1F00)
+ #define MACCR_PMM_RESET BIT(8)
+ #define MACCR_PMM_WAIT (2 << 8)
+ #define MACCR_PMM_READY (3 << 8)
+ #define MACCR_PMM_D1 (4 << 8)
+ #define MACCR_PMM_D2 (5 << 8)
+ #define MACCR_PMM_WAKE (7 << 8)
+ #define MACCR_PMM_D1_WAKE (8 << 8)
+ #define MACCR_PMM_D2_WAKE (9 << 8)
+ #define MACCR_PMM_SLEEP (10 << 8)
+ #define MACCR_PMM_PHY_RESET (11 << 8)
+ #define MACCR_PMM_SOFT_D1 (16 << 8)
+ #define MACCR_PMM_SOFT_D2 (17 << 8)
+#define P0_TFBFCR (0x10)
+ #define TFBFCR_SCHE_FREE_PAGE 0xE07F
+ #define TFBFCR_FREE_PAGE_BITS 0x07
+ #define TFBFCR_FREE_PAGE_LATCH BIT(6)
+ #define TFBFCR_SET_FREE_PAGE(x) (((x) & 0x3F) << TFBFCR_FREE_PAGE_BITS)
+ #define TFBFCR_TX_PAGE_SET BIT(13)
+ #define TFBFCR_MANU_ENTX BIT(15)
+ #define TX_FREEBUF_MASK 0x003F
+ #define TX_DPTSTART 0x4000
+
+#define P0_TSNR (0x12)
+ #define TXNR_TXB_ERR BIT(5)
+ #define TXNR_TXB_IDLE BIT(6)
+ #define TSNR_PKT_CNT(x) (((x) & 0x3F) << 8)
+ #define TXNR_TXB_REINIT BIT(14)
+ #define TSNR_TXB_START BIT(15)
+#define P0_RTDPR (0x14)
+#define P0_RXBCR1 (0x16)
+ #define RXBCR1_RXB_DISCARD BIT(14)
+ #define RXBCR1_RXB_START BIT(15)
+#define P0_RXBCR2 (0x18)
+ #define RXBCR2_PKT_MASK (0xFF)
+ #define RXBCR2_RXPC_MASK (0x7F)
+ #define RXBCR2_RXB_READY BIT(13)
+ #define RXBCR2_RXB_IDLE BIT(14)
+ #define RXBCR2_RXB_REINIT BIT(15)
+#define P0_RTWCR (0x1A)
+ #define RTWCR_RXWC_MASK (0x3FFF)
+ #define RTWCR_RX_LATCH BIT(15)
+#define P0_RCPHR (0x1C)
+
+ /* Definition of PAGE1 */
+#define P1_RPPER (0x22)
+ #define RPPER_RXEN BIT(0)
+#define P1_MRCR (0x28)
+#define P1_MDR (0x2A)
+#define P1_RMPR (0x2C)
+#define P1_TMPR (0x2E)
+#define P1_RXBSPCR (0x30)
+ #define RXBSPCR_STUF_WORD_CNT(x) (((x) & 0x7000) >> 12)
+ #define RXBSPCR_STUF_ENABLE BIT(15)
+#define P1_MCR (0x32)
+ #define MCR_SBP BIT(8)
+ #define MCR_SM BIT(9)
+ #define MCR_CRCENLAN BIT(11)
+ #define MCR_STP BIT(12)
+ /* Definition of PAGE2 */
+#define P2_CIR (0x42)
+#define P2_PCR (0x44)
+ #define PCR_POLL_EN BIT(0)
+ #define PCR_POLL_FLOWCTRL BIT(1)
+ #define PCR_POLL_BMCR BIT(2)
+ #define PCR_PHYID(x) ((x) << 8)
+#define P2_PHYSR (0x46)
+#define P2_MDIODR (0x48)
+#define P2_MDIOCR (0x4A)
+ #define MDIOCR_RADDR(x) ((x) & 0x1F)
+ #define MDIOCR_FADDR(x) (((x) & 0x1F) << 8)
+ #define MDIOCR_VALID BIT(13)
+ #define MDIOCR_READ BIT(14)
+ #define MDIOCR_WRITE BIT(15)
+#define P2_LCR0 (0x4C)
+ #define LCR_LED0_EN BIT(0)
+ #define LCR_LED0_100MODE BIT(1)
+ #define LCR_LED0_DUPLEX BIT(2)
+ #define LCR_LED0_LINK BIT(3)
+ #define LCR_LED0_ACT BIT(4)
+ #define LCR_LED0_COL BIT(5)
+ #define LCR_LED0_10MODE BIT(6)
+ #define LCR_LED0_DUPCOL BIT(7)
+ #define LCR_LED1_EN BIT(8)
+ #define LCR_LED1_100MODE BIT(9)
+ #define LCR_LED1_DUPLEX BIT(10)
+ #define LCR_LED1_LINK BIT(11)
+ #define LCR_LED1_ACT BIT(12)
+ #define LCR_LED1_COL BIT(13)
+ #define LCR_LED1_10MODE BIT(14)
+ #define LCR_LED1_DUPCOL BIT(15)
+#define P2_LCR1 (0x4E)
+ #define LCR_LED2_MASK (0xFF00)
+ #define LCR_LED2_EN BIT(0)
+ #define LCR_LED2_100MODE BIT(1)
+ #define LCR_LED2_DUPLEX BIT(2)
+ #define LCR_LED2_LINK BIT(3)
+ #define LCR_LED2_ACT BIT(4)
+ #define LCR_LED2_COL BIT(5)
+ #define LCR_LED2_10MODE BIT(6)
+ #define LCR_LED2_DUPCOL BIT(7)
+#define P2_IPGCR (0x50)
+#define P2_CRIR (0x52)
+#define P2_FLHWCR (0x54)
+#define P2_RXCR (0x56)
+ #define RXCR_PRO BIT(0)
+ #define RXCR_AMALL BIT(1)
+ #define RXCR_SEP BIT(2)
+ #define RXCR_AB BIT(3)
+ #define RXCR_AM BIT(4)
+ #define RXCR_AP BIT(5)
+ #define RXCR_ARP BIT(6)
+#define P2_JLCR (0x58)
+#define P2_MPLR (0x5C)
+
+ /* Definition of PAGE3 */
+#define P3_MACASR0 (0x62)
+ #define P3_MACASR(x) (P3_MACASR0 + 2 * (x))
+ #define MACASR_LOWBYTE_MASK 0x00FF
+ #define MACASR_HIGH_BITS 0x08
+#define P3_MACASR1 (0x64)
+#define P3_MACASR2 (0x66)
+#define P3_MFAR01 (0x68)
+#define P3_MFAR_BASE (0x68)
+ #define P3_MFAR(x) (P3_MFAR_BASE + 2 * (x))
+
+#define P3_MFAR23 (0x6A)
+#define P3_MFAR45 (0x6C)
+#define P3_MFAR67 (0x6E)
+#define P3_VID0FR (0x70)
+#define P3_VID1FR (0x72)
+#define P3_EECSR (0x74)
+#define P3_EEDR (0x76)
+#define P3_EECR (0x78)
+ #define EECR_ADDR_MASK (0x00FF)
+ #define EECR_READ_ACT BIT(8)
+ #define EECR_WRITE_ACT BIT(9)
+ #define EECR_WRITE_DISABLE BIT(10)
+ #define EECR_WRITE_ENABLE BIT(11)
+ #define EECR_EE_READY BIT(13)
+ #define EECR_RELOAD BIT(14)
+ #define EECR_RESET BIT(15)
+#define P3_TPCR (0x7A)
+ #define TPCR_PATT_MASK (0xFF)
+ #define TPCR_RAND_PKT_EN BIT(14)
+ #define TPCR_FIXED_PKT_EN BIT(15)
+#define P3_TPLR (0x7C)
+ /* Definition of PAGE4 */
+#define P4_SPICR (0x8A)
+ #define SPICR_RCEN BIT(0)
+ #define SPICR_QCEN BIT(1)
+ #define SPICR_RBRE BIT(3)
+ #define SPICR_PMM BIT(4)
+ #define SPICR_LOOPBACK BIT(8)
+ #define SPICR_CORE_RES_CLR BIT(10)
+ #define SPICR_SPI_RES_CLR BIT(11)
+#define P4_SPIISMR (0x8C)
+
+#define P4_COERCR0 (0x92)
+ #define COERCR0_RXIPCE BIT(0)
+ #define COERCR0_RXIPVE BIT(1)
+ #define COERCR0_RXV6PE BIT(2)
+ #define COERCR0_RXTCPE BIT(3)
+ #define COERCR0_RXUDPE BIT(4)
+ #define COERCR0_RXICMP BIT(5)
+ #define COERCR0_RXIGMP BIT(6)
+ #define COERCR0_RXICV6 BIT(7)
+
+ #define COERCR0_RXTCPV6 BIT(8)
+ #define COERCR0_RXUDPV6 BIT(9)
+ #define COERCR0_RXICMV6 BIT(10)
+ #define COERCR0_RXIGMV6 BIT(11)
+ #define COERCR0_RXICV6V6 BIT(12)
+
+ #define COERCR0_DEFAULT (COERCR0_RXIPCE | COERCR0_RXV6PE | \
+ COERCR0_RXTCPE | COERCR0_RXUDPE | \
+ COERCR0_RXTCPV6 | COERCR0_RXUDPV6)
+#define P4_COERCR1 (0x94)
+ #define COERCR1_IPCEDP BIT(0)
+ #define COERCR1_IPVEDP BIT(1)
+ #define COERCR1_V6VEDP BIT(2)
+ #define COERCR1_TCPEDP BIT(3)
+ #define COERCR1_UDPEDP BIT(4)
+ #define COERCR1_ICMPDP BIT(5)
+ #define COERCR1_IGMPDP BIT(6)
+ #define COERCR1_ICV6DP BIT(7)
+ #define COERCR1_RX64TE BIT(8)
+ #define COERCR1_RXPPPE BIT(9)
+ #define COERCR1_TCP6DP BIT(10)
+ #define COERCR1_UDP6DP BIT(11)
+ #define COERCR1_IC6DP BIT(12)
+ #define COERCR1_IG6DP BIT(13)
+ #define COERCR1_ICV66DP BIT(14)
+ #define COERCR1_RPCE BIT(15)
+
+ #define COERCR1_DEFAULT (COERCR1_RXPPPE)
+
+#define P4_COETCR0 (0x96)
+ #define COETCR0_TXIP BIT(0)
+ #define COETCR0_TXTCP BIT(1)
+ #define COETCR0_TXUDP BIT(2)
+ #define COETCR0_TXICMP BIT(3)
+ #define COETCR0_TXIGMP BIT(4)
+ #define COETCR0_TXICV6 BIT(5)
+ #define COETCR0_TXTCPV6 BIT(8)
+ #define COETCR0_TXUDPV6 BIT(9)
+ #define COETCR0_TXICMV6 BIT(10)
+ #define COETCR0_TXIGMV6 BIT(11)
+ #define COETCR0_TXICV6V6 BIT(12)
+
+ #define COETCR0_DEFAULT (COETCR0_TXIP | COETCR0_TXTCP | \
+ COETCR0_TXUDP | COETCR0_TXTCPV6 | \
+ COETCR0_TXUDPV6)
+#define P4_COETCR1 (0x98)
+ #define COETCR1_TX64TE BIT(0)
+ #define COETCR1_TXPPPE BIT(1)
+
+#define P4_COECEDR (0x9A)
+#define P4_L2CECR (0x9C)
+
+ /* Definition of PAGE5 */
+#define P5_WFTR (0xA2)
+ #define WFTR_2MS (0x01)
+ #define WFTR_4MS (0x02)
+ #define WFTR_8MS (0x03)
+ #define WFTR_16MS (0x04)
+ #define WFTR_32MS (0x05)
+ #define WFTR_64MS (0x06)
+ #define WFTR_128MS (0x07)
+ #define WFTR_256MS (0x08)
+ #define WFTR_512MS (0x09)
+ #define WFTR_1024MS (0x0A)
+ #define WFTR_2048MS (0x0B)
+ #define WFTR_4096MS (0x0C)
+ #define WFTR_8192MS (0x0D)
+ #define WFTR_16384MS (0x0E)
+ #define WFTR_32768MS (0x0F)
+#define P5_WFCCR (0xA4)
+#define P5_WFCR03 (0xA6)
+ #define WFCR03_F0_EN BIT(0)
+ #define WFCR03_F1_EN BIT(4)
+ #define WFCR03_F2_EN BIT(8)
+ #define WFCR03_F3_EN BIT(12)
+#define P5_WFCR47 (0xA8)
+ #define WFCR47_F4_EN BIT(0)
+ #define WFCR47_F5_EN BIT(4)
+ #define WFCR47_F6_EN BIT(8)
+ #define WFCR47_F7_EN BIT(12)
+#define P5_WF0BMR0 (0xAA)
+#define P5_WF0BMR1 (0xAC)
+#define P5_WF0CR (0xAE)
+#define P5_WF0OBR (0xB0)
+#define P5_WF1BMR0 (0xB2)
+#define P5_WF1BMR1 (0xB4)
+#define P5_WF1CR (0xB6)
+#define P5_WF1OBR (0xB8)
+#define P5_WF2BMR0 (0xBA)
+#define P5_WF2BMR1 (0xBC)
+
+ /* Definition of PAGE6 */
+#define P6_WF2CR (0xC2)
+#define P6_WF2OBR (0xC4)
+#define P6_WF3BMR0 (0xC6)
+#define P6_WF3BMR1 (0xC8)
+#define P6_WF3CR (0xCA)
+#define P6_WF3OBR (0xCC)
+#define P6_WF4BMR0 (0xCE)
+#define P6_WF4BMR1 (0xD0)
+#define P6_WF4CR (0xD2)
+#define P6_WF4OBR (0xD4)
+#define P6_WF5BMR0 (0xD6)
+#define P6_WF5BMR1 (0xD8)
+#define P6_WF5CR (0xDA)
+#define P6_WF5OBR (0xDC)
+
+/* Definition of PAGE7 */
+#define P7_WF6BMR0 (0xE2)
+#define P7_WF6BMR1 (0xE4)
+#define P7_WF6CR (0xE6)
+#define P7_WF6OBR (0xE8)
+#define P7_WF7BMR0 (0xEA)
+#define P7_WF7BMR1 (0xEC)
+#define P7_WF7CR (0xEE)
+#define P7_WF7OBR (0xF0)
+#define P7_WFR01 (0xF2)
+#define P7_WFR23 (0xF4)
+#define P7_WFR45 (0xF6)
+#define P7_WFR67 (0xF8)
+#define P7_WFPC0 (0xFA)
+#define P7_WFPC1 (0xFC)
+
+/* Tx headers structure */
+struct tx_sop_header {
+ /* bit 15-11: flags, bit 10-0: packet length */
+ u16 flags_len;
+ /* bit 15-11: sequence number, bit 11-0: packet length bar */
+ u16 seq_lenbar;
+} __packed;
+
+struct tx_segment_header {
+ /* bit 15-14: flags, bit 13-11: segment number */
+ /* bit 10-0: segment length */
+ u16 flags_seqnum_seglen;
+ /* bit 15-14: end offset, bit 13-11: start offset */
+ /* bit 10-0: segment length bar */
+ u16 eo_so_seglenbar;
+} __packed;
+
+struct tx_eop_header {
+ /* bit 15-11: sequence number, bit 10-0: packet length */
+ u16 seq_len;
+ /* bit 15-11: sequence number bar, bit 10-0: packet length bar */
+ u16 seqbar_lenbar;
+} __packed;
+
+struct tx_pkt_info {
+ struct tx_sop_header sop;
+ struct tx_segment_header seg;
+ struct tx_eop_header eop;
+ u16 pkt_len;
+ u16 seq_num;
+} __packed;
+
+/* Rx headers structure */
+struct rx_header {
+ u16 flags_len;
+ u16 seq_lenbar;
+ u16 flags;
+} __packed;
+
+extern unsigned long ax88796c_no_regs_mask[];
+
+#endif /* #ifndef _AX88796C_MAIN_H */
diff --git a/drivers/net/ethernet/asix/ax88796c_spi.c b/drivers/net/ethernet/asix/ax88796c_spi.c
new file mode 100644
index 000000000000..1a20bbeb4dc1
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_spi.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#define pr_fmt(fmt) "ax88796c: " fmt
+
+#include <linux/string.h>
+#include <linux/spi/spi.h>
+
+#include "ax88796c_spi.h"
+
+/* driver bus management functions */
+int axspi_wakeup(const struct axspi_data *ax_spi)
+{
+ u8 tx_buf;
+ int ret;
+
+ tx_buf = AX_SPICMD_EXIT_PWD; /* OP */
+ ret = spi_write(ax_spi->spi, &tx_buf, 1);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ return ret;
+}
+
+int axspi_read_status(const struct axspi_data *ax_spi, struct spi_status *status)
+{
+ u8 tx_buf;
+ int ret;
+
+ /* OP */
+ tx_buf = AX_SPICMD_READ_STATUS;
+ ret = spi_write_then_read(ax_spi->spi, &tx_buf, 1, (u8 *)&status, 3);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ else
+ le16_to_cpus(&status->isr);
+
+ return ret;
+}
+
+int axspi_read_rxq(struct axspi_data *ax_spi, void *data, int len)
+{
+ struct spi_transfer *xfer = ax_spi->spi_rx_xfer;
+ int ret;
+
+ memcpy(ax_spi->cmd_buf, rx_cmd_buf, 5);
+
+ xfer->tx_buf = ax_spi->cmd_buf;
+ xfer->rx_buf = NULL;
+ xfer->len = ax_spi->comp ? 2 : 5;
+ xfer->bits_per_word = 8;
+ spi_message_add_tail(xfer, &ax_spi->rx_msg);
+
+ xfer++;
+ xfer->rx_buf = data;
+ xfer->tx_buf = NULL;
+ xfer->len = len;
+ xfer->bits_per_word = 8;
+ spi_message_add_tail(xfer, &ax_spi->rx_msg);
+ ret = spi_sync(ax_spi->spi, &ax_spi->rx_msg);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+
+ return ret;
+}
+
+int axspi_write_txq(const struct axspi_data *ax_spi, void *data, int len)
+{
+ return spi_write(ax_spi->spi, data, len);
+}
+
+u16 axspi_read_reg(const struct axspi_data *ax_spi, u8 reg)
+{
+ u8 tx_buf[4];
+ u16 rx_buf = 0;
+ int ret;
+ int len = ax_spi->comp ? 3 : 4;
+
+ tx_buf[0] = 0x03; /* OP code read register */
+ tx_buf[1] = reg; /* register address */
+ tx_buf[2] = 0xFF; /* dumy cycle */
+ tx_buf[3] = 0xFF; /* dumy cycle */
+ ret = spi_write_then_read(ax_spi->spi, tx_buf, len, (u8 *)&rx_buf, 2);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ else
+ le16_to_cpus(&rx_buf);
+
+ return rx_buf;
+}
+
+int axspi_write_reg(const struct axspi_data *ax_spi, u8 reg, u16 value)
+{
+ u8 tx_buf[4];
+ int ret;
+
+ tx_buf[0] = AX_SPICMD_WRITE_REG; /* OP code read register */
+ tx_buf[1] = reg; /* register address */
+ tx_buf[2] = value;
+ tx_buf[3] = value >> 8;
+
+ ret = spi_write(ax_spi->spi, tx_buf, 4);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ return ret;
+}
+
diff --git a/drivers/net/ethernet/asix/ax88796c_spi.h b/drivers/net/ethernet/asix/ax88796c_spi.h
new file mode 100644
index 000000000000..7a49205c2cfb
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_spi.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#ifndef _AX88796C_SPI_H
+#define _AX88796C_SPI_H
+
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+
+/* Definition of SPI command */
+#define AX_SPICMD_WRITE_TXQ 0x02
+#define AX_SPICMD_READ_REG 0x03
+#define AX_SPICMD_READ_STATUS 0x05
+#define AX_SPICMD_READ_RXQ 0x0B
+#define AX_SPICMD_BIDIR_WRQ 0xB2
+#define AX_SPICMD_WRITE_REG 0xD8
+#define AX_SPICMD_EXIT_PWD 0xAB
+
+static const u8 rx_cmd_buf[5] = {AX_SPICMD_READ_RXQ, 0xFF, 0xFF, 0xFF, 0xFF};
+static const u8 tx_cmd_buf[4] = {AX_SPICMD_WRITE_TXQ, 0xFF, 0xFF, 0xFF};
+
+struct axspi_data {
+ struct spi_device *spi;
+ struct spi_message rx_msg;
+ struct spi_transfer spi_rx_xfer[2];
+ u8 cmd_buf[6];
+ u8 comp;
+};
+
+struct spi_status {
+ u16 isr;
+ u8 status;
+# define AX_STATUS_READY 0x80
+};
+
+int axspi_read_rxq(struct axspi_data *ax_spi, void *data, int len);
+int axspi_write_txq(const struct axspi_data *ax_spi, void *data, int len);
+u16 axspi_read_reg(const struct axspi_data *ax_spi, u8 reg);
+int axspi_write_reg(const struct axspi_data *ax_spi, u8 reg, u16 value);
+int axspi_read_status(const struct axspi_data *ax_spi, struct spi_status *status);
+int axspi_wakeup(const struct axspi_data *ax_spi);
+
+static inline u16 AX_READ(const struct axspi_data *ax_spi, u8 offset)
+{
+ return axspi_read_reg(ax_spi, offset);
+}
+
+static inline int AX_WRITE(const struct axspi_data *ax_spi, u16 value, u8 offset)
+{
+ return axspi_write_reg(ax_spi, offset, value);
+}
+
+static inline int AX_READ_STATUS(const struct axspi_data *ax_spi,
+ struct spi_status *status)
+{
+ return axspi_read_status(ax_spi, status);
+}
+
+static inline int AX_WAKEUP(struct axspi_data *ax_spi)
+{
+ return axspi_wakeup(ax_spi);
+}
+#endif
+
--
2.26.2