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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/net/ethernet/arc
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/ethernet/arc')
-rw-r--r--drivers/net/ethernet/arc/Kconfig47
-rw-r--r--drivers/net/ethernet/arc/Makefile9
-rw-r--r--drivers/net/ethernet/arc/emac.h225
-rw-r--r--drivers/net/ethernet/arc/emac_arc.c90
-rw-r--r--drivers/net/ethernet/arc/emac_main.c1027
-rw-r--r--drivers/net/ethernet/arc/emac_mdio.c190
-rw-r--r--drivers/net/ethernet/arc/emac_rockchip.c279
7 files changed, 1867 insertions, 0 deletions
diff --git a/drivers/net/ethernet/arc/Kconfig b/drivers/net/ethernet/arc/Kconfig
new file mode 100644
index 0000000000..0a67612af2
--- /dev/null
+++ b/drivers/net/ethernet/arc/Kconfig
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# ARC EMAC network device configuration
+#
+
+config NET_VENDOR_ARC
+ bool "ARC devices"
+ default y
+ help
+ If you have a network (Ethernet) card belonging to this class, say Y.
+
+ Note that the answer to this question doesn't directly affect the
+ kernel: saying N will just cause the configurator to skip all
+ the questions about ARC cards. If you say Y, you will be asked for
+ your specific card in the following questions.
+
+if NET_VENDOR_ARC
+
+config ARC_EMAC_CORE
+ tristate
+ depends on ARC || ARCH_ROCKCHIP || COMPILE_TEST
+ select MII
+ select PHYLIB
+ select CRC32
+
+config ARC_EMAC
+ tristate "ARC EMAC support"
+ select ARC_EMAC_CORE
+ depends on OF_IRQ
+ depends on ARC || COMPILE_TEST
+ help
+ On some legacy ARC (Synopsys) FPGA boards such as ARCAngel4/ML50x
+ non-standard on-chip ethernet device ARC EMAC 10/100 is used.
+ Say Y here if you have such a board. If unsure, say N.
+
+config EMAC_ROCKCHIP
+ tristate "Rockchip EMAC support"
+ select ARC_EMAC_CORE
+ depends on OF_IRQ && REGULATOR
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ help
+ Support for Rockchip RK3036/RK3066/RK3188 EMAC ethernet controllers.
+ This selects Rockchip SoC glue layer support for the
+ emac device driver. This driver is used for RK3036/RK3066/RK3188
+ EMAC ethernet controller.
+
+endif # NET_VENDOR_ARC
diff --git a/drivers/net/ethernet/arc/Makefile b/drivers/net/ethernet/arc/Makefile
new file mode 100644
index 0000000000..d63ada577c
--- /dev/null
+++ b/drivers/net/ethernet/arc/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the ARC network device drivers.
+#
+
+arc_emac-objs := emac_main.o emac_mdio.o
+obj-$(CONFIG_ARC_EMAC_CORE) += arc_emac.o
+obj-$(CONFIG_ARC_EMAC) += emac_arc.o
+obj-$(CONFIG_EMAC_ROCKCHIP) += emac_rockchip.o
diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h
new file mode 100644
index 0000000000..0e244f0e25
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac.h
@@ -0,0 +1,225 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Registers and bits definitions of ARC EMAC
+ */
+
+#ifndef ARC_EMAC_H
+#define ARC_EMAC_H
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/clk.h>
+
+/* STATUS and ENABLE Register bit masks */
+#define TXINT_MASK (1 << 0) /* Transmit interrupt */
+#define RXINT_MASK (1 << 1) /* Receive interrupt */
+#define ERR_MASK (1 << 2) /* Error interrupt */
+#define TXCH_MASK (1 << 3) /* Transmit chaining error interrupt */
+#define MSER_MASK (1 << 4) /* Missed packet counter error */
+#define RXCR_MASK (1 << 8) /* RXCRCERR counter rolled over */
+#define RXFR_MASK (1 << 9) /* RXFRAMEERR counter rolled over */
+#define RXFL_MASK (1 << 10) /* RXOFLOWERR counter rolled over */
+#define MDIO_MASK (1 << 12) /* MDIO complete interrupt */
+#define TXPL_MASK (1 << 31) /* Force polling of BD by EMAC */
+
+/* CONTROL Register bit masks */
+#define EN_MASK (1 << 0) /* VMAC enable */
+#define TXRN_MASK (1 << 3) /* TX enable */
+#define RXRN_MASK (1 << 4) /* RX enable */
+#define DSBC_MASK (1 << 8) /* Disable receive broadcast */
+#define ENFL_MASK (1 << 10) /* Enable Full-duplex */
+#define PROM_MASK (1 << 11) /* Promiscuous mode */
+
+/* Buffer descriptor INFO bit masks */
+#define OWN_MASK (1 << 31) /* 0-CPU or 1-EMAC owns buffer */
+#define FIRST_MASK (1 << 16) /* First buffer in chain */
+#define LAST_MASK (1 << 17) /* Last buffer in chain */
+#define LEN_MASK 0x000007FF /* last 11 bits */
+#define CRLS (1 << 21)
+#define DEFR (1 << 22)
+#define DROP (1 << 23)
+#define RTRY (1 << 24)
+#define LTCL (1 << 28)
+#define UFLO (1 << 29)
+
+#define FOR_EMAC OWN_MASK
+#define FOR_CPU 0
+
+/* ARC EMAC register set combines entries for MAC and MDIO */
+enum {
+ R_ID = 0,
+ R_STATUS,
+ R_ENABLE,
+ R_CTRL,
+ R_POLLRATE,
+ R_RXERR,
+ R_MISS,
+ R_TX_RING,
+ R_RX_RING,
+ R_ADDRL,
+ R_ADDRH,
+ R_LAFL,
+ R_LAFH,
+ R_MDIO,
+};
+
+#define TX_TIMEOUT (400 * HZ / 1000) /* Transmission timeout */
+
+#define ARC_EMAC_NAPI_WEIGHT 40 /* Workload for NAPI */
+
+#define EMAC_BUFFER_SIZE 1536 /* EMAC buffer size */
+
+/**
+ * struct arc_emac_bd - EMAC buffer descriptor (BD).
+ *
+ * @info: Contains status information on the buffer itself.
+ * @data: 32-bit byte addressable pointer to the packet data.
+ */
+struct arc_emac_bd {
+ __le32 info;
+ dma_addr_t data;
+};
+
+/* Number of Rx/Tx BD's */
+#define RX_BD_NUM 128
+#define TX_BD_NUM 128
+
+#define RX_RING_SZ (RX_BD_NUM * sizeof(struct arc_emac_bd))
+#define TX_RING_SZ (TX_BD_NUM * sizeof(struct arc_emac_bd))
+
+/**
+ * struct buffer_state - Stores Rx/Tx buffer state.
+ * @sk_buff: Pointer to socket buffer.
+ * @addr: Start address of DMA-mapped memory region.
+ * @len: Length of DMA-mapped memory region.
+ */
+struct buffer_state {
+ struct sk_buff *skb;
+ DEFINE_DMA_UNMAP_ADDR(addr);
+ DEFINE_DMA_UNMAP_LEN(len);
+};
+
+struct arc_emac_mdio_bus_data {
+ struct gpio_desc *reset_gpio;
+ int msec;
+};
+
+/**
+ * struct arc_emac_priv - Storage of EMAC's private information.
+ * @dev: Pointer to the current device.
+ * @phy_dev: Pointer to attached PHY device.
+ * @bus: Pointer to the current MII bus.
+ * @regs: Base address of EMAC memory-mapped control registers.
+ * @napi: Structure for NAPI.
+ * @rxbd: Pointer to Rx BD ring.
+ * @txbd: Pointer to Tx BD ring.
+ * @rxbd_dma: DMA handle for Rx BD ring.
+ * @txbd_dma: DMA handle for Tx BD ring.
+ * @rx_buff: Storage for Rx buffers states.
+ * @tx_buff: Storage for Tx buffers states.
+ * @txbd_curr: Index of Tx BD to use on the next "ndo_start_xmit".
+ * @txbd_dirty: Index of Tx BD to free on the next Tx interrupt.
+ * @last_rx_bd: Index of the last Rx BD we've got from EMAC.
+ * @link: PHY's last seen link state.
+ * @duplex: PHY's last set duplex mode.
+ * @speed: PHY's last set speed.
+ */
+struct arc_emac_priv {
+ const char *drv_name;
+ void (*set_mac_speed)(void *priv, unsigned int speed);
+
+ /* Devices */
+ struct device *dev;
+ struct mii_bus *bus;
+ struct arc_emac_mdio_bus_data bus_data;
+
+ void __iomem *regs;
+ struct clk *clk;
+
+ struct napi_struct napi;
+
+ struct arc_emac_bd *rxbd;
+ struct arc_emac_bd *txbd;
+
+ dma_addr_t rxbd_dma;
+ dma_addr_t txbd_dma;
+
+ struct buffer_state rx_buff[RX_BD_NUM];
+ struct buffer_state tx_buff[TX_BD_NUM];
+ unsigned int txbd_curr;
+ unsigned int txbd_dirty;
+
+ unsigned int last_rx_bd;
+
+ unsigned int link;
+ unsigned int duplex;
+ unsigned int speed;
+
+ unsigned int rx_missed_errors;
+};
+
+/**
+ * arc_reg_set - Sets EMAC register with provided value.
+ * @priv: Pointer to ARC EMAC private data structure.
+ * @reg: Register offset from base address.
+ * @value: Value to set in register.
+ */
+static inline void arc_reg_set(struct arc_emac_priv *priv, int reg, int value)
+{
+ iowrite32(value, priv->regs + reg * sizeof(int));
+}
+
+/**
+ * arc_reg_get - Gets value of specified EMAC register.
+ * @priv: Pointer to ARC EMAC private data structure.
+ * @reg: Register offset from base address.
+ *
+ * returns: Value of requested register.
+ */
+static inline unsigned int arc_reg_get(struct arc_emac_priv *priv, int reg)
+{
+ return ioread32(priv->regs + reg * sizeof(int));
+}
+
+/**
+ * arc_reg_or - Applies mask to specified EMAC register - ("reg" | "mask").
+ * @priv: Pointer to ARC EMAC private data structure.
+ * @reg: Register offset from base address.
+ * @mask: Mask to apply to specified register.
+ *
+ * This function reads initial register value, then applies provided mask
+ * to it and then writes register back.
+ */
+static inline void arc_reg_or(struct arc_emac_priv *priv, int reg, int mask)
+{
+ unsigned int value = arc_reg_get(priv, reg);
+
+ arc_reg_set(priv, reg, value | mask);
+}
+
+/**
+ * arc_reg_clr - Applies mask to specified EMAC register - ("reg" & ~"mask").
+ * @priv: Pointer to ARC EMAC private data structure.
+ * @reg: Register offset from base address.
+ * @mask: Mask to apply to specified register.
+ *
+ * This function reads initial register value, then applies provided mask
+ * to it and then writes register back.
+ */
+static inline void arc_reg_clr(struct arc_emac_priv *priv, int reg, int mask)
+{
+ unsigned int value = arc_reg_get(priv, reg);
+
+ arc_reg_set(priv, reg, value & ~mask);
+}
+
+int arc_mdio_probe(struct arc_emac_priv *priv);
+int arc_mdio_remove(struct arc_emac_priv *priv);
+int arc_emac_probe(struct net_device *ndev, int interface);
+void arc_emac_remove(struct net_device *ndev);
+
+#endif /* ARC_EMAC_H */
diff --git a/drivers/net/ethernet/arc/emac_arc.c b/drivers/net/ethernet/arc/emac_arc.c
new file mode 100644
index 0000000000..ce3147e886
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac_arc.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * DOC: emac_arc.c - ARC EMAC specific glue layer
+ *
+ * Copyright (C) 2014 Romain Perier
+ *
+ * Romain Perier <romain.perier@gmail.com>
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+
+#include "emac.h"
+
+#define DRV_NAME "emac_arc"
+
+static int emac_arc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct arc_emac_priv *priv;
+ phy_interface_t interface;
+ struct net_device *ndev;
+ int err;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
+ if (!ndev)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, ndev);
+ SET_NETDEV_DEV(ndev, dev);
+
+ priv = netdev_priv(ndev);
+ priv->drv_name = DRV_NAME;
+
+ err = of_get_phy_mode(dev->of_node, &interface);
+ if (err) {
+ if (err == -ENODEV)
+ interface = PHY_INTERFACE_MODE_MII;
+ else
+ goto out_netdev;
+ }
+
+ priv->clk = devm_clk_get(dev, "hclk");
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev, "failed to retrieve host clock from device tree\n");
+ err = -EINVAL;
+ goto out_netdev;
+ }
+
+ err = arc_emac_probe(ndev, interface);
+out_netdev:
+ if (err)
+ free_netdev(ndev);
+ return err;
+}
+
+static int emac_arc_remove(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+
+ arc_emac_remove(ndev);
+ free_netdev(ndev);
+
+ return 0;
+}
+
+static const struct of_device_id emac_arc_dt_ids[] = {
+ { .compatible = "snps,arc-emac" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, emac_arc_dt_ids);
+
+static struct platform_driver emac_arc_driver = {
+ .probe = emac_arc_probe,
+ .remove = emac_arc_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = emac_arc_dt_ids,
+ },
+};
+
+module_platform_driver(emac_arc_driver);
+
+MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
+MODULE_DESCRIPTION("ARC EMAC platform driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
new file mode 100644
index 0000000000..31ee477dd1
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -0,0 +1,1027 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Driver for the ARC EMAC 10100 (hardware revision 5)
+ *
+ * Contributors:
+ * Amit Bhor
+ * Sameer Dhavale
+ * Vineet Gupta
+ */
+
+#include <linux/crc32.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+
+#include "emac.h"
+
+static void arc_emac_restart(struct net_device *ndev);
+
+/**
+ * arc_emac_tx_avail - Return the number of available slots in the tx ring.
+ * @priv: Pointer to ARC EMAC private data structure.
+ *
+ * returns: the number of slots available for transmission in tx the ring.
+ */
+static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
+{
+ return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
+}
+
+/**
+ * arc_emac_adjust_link - Adjust the PHY link duplex.
+ * @ndev: Pointer to the net_device structure.
+ *
+ * This function is called to change the duplex setting after auto negotiation
+ * is done by the PHY.
+ */
+static void arc_emac_adjust_link(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct phy_device *phy_dev = ndev->phydev;
+ unsigned int reg, state_changed = 0;
+
+ if (priv->link != phy_dev->link) {
+ priv->link = phy_dev->link;
+ state_changed = 1;
+ }
+
+ if (priv->speed != phy_dev->speed) {
+ priv->speed = phy_dev->speed;
+ state_changed = 1;
+ if (priv->set_mac_speed)
+ priv->set_mac_speed(priv, priv->speed);
+ }
+
+ if (priv->duplex != phy_dev->duplex) {
+ reg = arc_reg_get(priv, R_CTRL);
+
+ if (phy_dev->duplex == DUPLEX_FULL)
+ reg |= ENFL_MASK;
+ else
+ reg &= ~ENFL_MASK;
+
+ arc_reg_set(priv, R_CTRL, reg);
+ priv->duplex = phy_dev->duplex;
+ state_changed = 1;
+ }
+
+ if (state_changed)
+ phy_print_status(phy_dev);
+}
+
+/**
+ * arc_emac_get_drvinfo - Get EMAC driver information.
+ * @ndev: Pointer to net_device structure.
+ * @info: Pointer to ethtool_drvinfo structure.
+ *
+ * This implements ethtool command for getting the driver information.
+ * Issue "ethtool -i ethX" under linux prompt to execute this function.
+ */
+static void arc_emac_get_drvinfo(struct net_device *ndev,
+ struct ethtool_drvinfo *info)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+
+ strscpy(info->driver, priv->drv_name, sizeof(info->driver));
+}
+
+static const struct ethtool_ops arc_emac_ethtool_ops = {
+ .get_drvinfo = arc_emac_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_link_ksettings = phy_ethtool_get_link_ksettings,
+ .set_link_ksettings = phy_ethtool_set_link_ksettings,
+};
+
+#define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
+
+/**
+ * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
+ * @ndev: Pointer to the network device.
+ */
+static void arc_emac_tx_clean(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ unsigned int i;
+
+ for (i = 0; i < TX_BD_NUM; i++) {
+ unsigned int *txbd_dirty = &priv->txbd_dirty;
+ struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
+ struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
+ struct sk_buff *skb = tx_buff->skb;
+ unsigned int info = le32_to_cpu(txbd->info);
+
+ if ((info & FOR_EMAC) || !txbd->data || !skb)
+ break;
+
+ if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
+ stats->tx_errors++;
+ stats->tx_dropped++;
+
+ if (info & DEFR)
+ stats->tx_carrier_errors++;
+
+ if (info & LTCL)
+ stats->collisions++;
+
+ if (info & UFLO)
+ stats->tx_fifo_errors++;
+ } else if (likely(info & FIRST_OR_LAST_MASK)) {
+ stats->tx_packets++;
+ stats->tx_bytes += skb->len;
+ }
+
+ dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
+ dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
+
+ /* return the sk_buff to system */
+ dev_consume_skb_irq(skb);
+
+ txbd->data = 0;
+ txbd->info = 0;
+ tx_buff->skb = NULL;
+
+ *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
+ }
+
+ /* Ensure that txbd_dirty is visible to tx() before checking
+ * for queue stopped.
+ */
+ smp_mb();
+
+ if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
+ netif_wake_queue(ndev);
+}
+
+/**
+ * arc_emac_rx - processing of Rx packets.
+ * @ndev: Pointer to the network device.
+ * @budget: How many BDs to process on 1 call.
+ *
+ * returns: Number of processed BDs
+ *
+ * Iterate through Rx BDs and deliver received packages to upper layer.
+ */
+static int arc_emac_rx(struct net_device *ndev, int budget)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int work_done;
+
+ for (work_done = 0; work_done < budget; work_done++) {
+ unsigned int *last_rx_bd = &priv->last_rx_bd;
+ struct net_device_stats *stats = &ndev->stats;
+ struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
+ struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
+ unsigned int pktlen, info = le32_to_cpu(rxbd->info);
+ struct sk_buff *skb;
+ dma_addr_t addr;
+
+ if (unlikely((info & OWN_MASK) == FOR_EMAC))
+ break;
+
+ /* Make a note that we saw a packet at this BD.
+ * So next time, driver starts from this + 1
+ */
+ *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
+
+ if (unlikely((info & FIRST_OR_LAST_MASK) !=
+ FIRST_OR_LAST_MASK)) {
+ /* We pre-allocate buffers of MTU size so incoming
+ * packets won't be split/chained.
+ */
+ if (net_ratelimit())
+ netdev_err(ndev, "incomplete packet received\n");
+
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+ stats->rx_errors++;
+ stats->rx_length_errors++;
+ continue;
+ }
+
+ /* Prepare the BD for next cycle. netif_receive_skb()
+ * only if new skb was allocated and mapped to avoid holes
+ * in the RX fifo.
+ */
+ skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE);
+ if (unlikely(!skb)) {
+ if (net_ratelimit())
+ netdev_err(ndev, "cannot allocate skb\n");
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+ stats->rx_errors++;
+ stats->rx_dropped++;
+ continue;
+ }
+
+ addr = dma_map_single(&ndev->dev, (void *)skb->data,
+ EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(&ndev->dev, addr)) {
+ if (net_ratelimit())
+ netdev_err(ndev, "cannot map dma buffer\n");
+ dev_kfree_skb(skb);
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+ stats->rx_errors++;
+ stats->rx_dropped++;
+ continue;
+ }
+
+ /* unmap previosly mapped skb */
+ dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
+ dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
+
+ pktlen = info & LEN_MASK;
+ stats->rx_packets++;
+ stats->rx_bytes += pktlen;
+ skb_put(rx_buff->skb, pktlen);
+ rx_buff->skb->dev = ndev;
+ rx_buff->skb->protocol = eth_type_trans(rx_buff->skb, ndev);
+
+ netif_receive_skb(rx_buff->skb);
+
+ rx_buff->skb = skb;
+ dma_unmap_addr_set(rx_buff, addr, addr);
+ dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
+
+ rxbd->data = cpu_to_le32(addr);
+
+ /* Make sure pointer to data buffer is set */
+ wmb();
+
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+ }
+
+ return work_done;
+}
+
+/**
+ * arc_emac_rx_miss_handle - handle R_MISS register
+ * @ndev: Pointer to the net_device structure.
+ */
+static void arc_emac_rx_miss_handle(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ unsigned int miss;
+
+ miss = arc_reg_get(priv, R_MISS);
+ if (miss) {
+ stats->rx_errors += miss;
+ stats->rx_missed_errors += miss;
+ priv->rx_missed_errors += miss;
+ }
+}
+
+/**
+ * arc_emac_rx_stall_check - check RX stall
+ * @ndev: Pointer to the net_device structure.
+ * @budget: How many BDs requested to process on 1 call.
+ * @work_done: How many BDs processed
+ *
+ * Under certain conditions EMAC stop reception of incoming packets and
+ * continuously increment R_MISS register instead of saving data into
+ * provided buffer. This function detect that condition and restart
+ * EMAC.
+ */
+static void arc_emac_rx_stall_check(struct net_device *ndev,
+ int budget, unsigned int work_done)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct arc_emac_bd *rxbd;
+
+ if (work_done)
+ priv->rx_missed_errors = 0;
+
+ if (priv->rx_missed_errors && budget) {
+ rxbd = &priv->rxbd[priv->last_rx_bd];
+ if (le32_to_cpu(rxbd->info) & FOR_EMAC) {
+ arc_emac_restart(ndev);
+ priv->rx_missed_errors = 0;
+ }
+ }
+}
+
+/**
+ * arc_emac_poll - NAPI poll handler.
+ * @napi: Pointer to napi_struct structure.
+ * @budget: How many BDs to process on 1 call.
+ *
+ * returns: Number of processed BDs
+ */
+static int arc_emac_poll(struct napi_struct *napi, int budget)
+{
+ struct net_device *ndev = napi->dev;
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int work_done;
+
+ arc_emac_tx_clean(ndev);
+ arc_emac_rx_miss_handle(ndev);
+
+ work_done = arc_emac_rx(ndev, budget);
+ if (work_done < budget) {
+ napi_complete_done(napi, work_done);
+ arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
+ }
+
+ arc_emac_rx_stall_check(ndev, budget, work_done);
+
+ return work_done;
+}
+
+/**
+ * arc_emac_intr - Global interrupt handler for EMAC.
+ * @irq: irq number.
+ * @dev_instance: device instance.
+ *
+ * returns: IRQ_HANDLED for all cases.
+ *
+ * ARC EMAC has only 1 interrupt line, and depending on bits raised in
+ * STATUS register we may tell what is a reason for interrupt to fire.
+ */
+static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
+{
+ struct net_device *ndev = dev_instance;
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ unsigned int status;
+
+ status = arc_reg_get(priv, R_STATUS);
+ status &= ~MDIO_MASK;
+
+ /* Reset all flags except "MDIO complete" */
+ arc_reg_set(priv, R_STATUS, status);
+
+ if (status & (RXINT_MASK | TXINT_MASK)) {
+ if (likely(napi_schedule_prep(&priv->napi))) {
+ arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
+ __napi_schedule(&priv->napi);
+ }
+ }
+
+ if (status & ERR_MASK) {
+ /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
+ * 8-bit error counter overrun.
+ */
+
+ if (status & MSER_MASK) {
+ stats->rx_missed_errors += 0x100;
+ stats->rx_errors += 0x100;
+ priv->rx_missed_errors += 0x100;
+ napi_schedule(&priv->napi);
+ }
+
+ if (status & RXCR_MASK) {
+ stats->rx_crc_errors += 0x100;
+ stats->rx_errors += 0x100;
+ }
+
+ if (status & RXFR_MASK) {
+ stats->rx_frame_errors += 0x100;
+ stats->rx_errors += 0x100;
+ }
+
+ if (status & RXFL_MASK) {
+ stats->rx_over_errors += 0x100;
+ stats->rx_errors += 0x100;
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void arc_emac_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ arc_emac_intr(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+/**
+ * arc_emac_open - Open the network device.
+ * @ndev: Pointer to the network device.
+ *
+ * returns: 0, on success or non-zero error value on failure.
+ *
+ * This function sets the MAC address, requests and enables an IRQ
+ * for the EMAC device and starts the Tx queue.
+ * It also connects to the phy device.
+ */
+static int arc_emac_open(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct phy_device *phy_dev = ndev->phydev;
+ int i;
+
+ phy_dev->autoneg = AUTONEG_ENABLE;
+ phy_dev->speed = 0;
+ phy_dev->duplex = 0;
+ linkmode_and(phy_dev->advertising, phy_dev->advertising,
+ phy_dev->supported);
+
+ priv->last_rx_bd = 0;
+
+ /* Allocate and set buffers for Rx BD's */
+ for (i = 0; i < RX_BD_NUM; i++) {
+ dma_addr_t addr;
+ unsigned int *last_rx_bd = &priv->last_rx_bd;
+ struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
+ struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
+
+ rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
+ EMAC_BUFFER_SIZE);
+ if (unlikely(!rx_buff->skb))
+ return -ENOMEM;
+
+ addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
+ EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(&ndev->dev, addr)) {
+ netdev_err(ndev, "cannot dma map\n");
+ dev_kfree_skb(rx_buff->skb);
+ return -ENOMEM;
+ }
+ dma_unmap_addr_set(rx_buff, addr, addr);
+ dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
+
+ rxbd->data = cpu_to_le32(addr);
+
+ /* Make sure pointer to data buffer is set */
+ wmb();
+
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+
+ *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
+ }
+
+ priv->txbd_curr = 0;
+ priv->txbd_dirty = 0;
+
+ /* Clean Tx BD's */
+ memset(priv->txbd, 0, TX_RING_SZ);
+
+ /* Initialize logical address filter */
+ arc_reg_set(priv, R_LAFL, 0);
+ arc_reg_set(priv, R_LAFH, 0);
+
+ /* Set BD ring pointers for device side */
+ arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
+ arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
+
+ /* Enable interrupts */
+ arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
+
+ /* Set CONTROL */
+ arc_reg_set(priv, R_CTRL,
+ (RX_BD_NUM << 24) | /* RX BD table length */
+ (TX_BD_NUM << 16) | /* TX BD table length */
+ TXRN_MASK | RXRN_MASK);
+
+ napi_enable(&priv->napi);
+
+ /* Enable EMAC */
+ arc_reg_or(priv, R_CTRL, EN_MASK);
+
+ phy_start(ndev->phydev);
+
+ netif_start_queue(ndev);
+
+ return 0;
+}
+
+/**
+ * arc_emac_set_rx_mode - Change the receive filtering mode.
+ * @ndev: Pointer to the network device.
+ *
+ * This function enables/disables promiscuous or all-multicast mode
+ * and updates the multicast filtering list of the network device.
+ */
+static void arc_emac_set_rx_mode(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+
+ if (ndev->flags & IFF_PROMISC) {
+ arc_reg_or(priv, R_CTRL, PROM_MASK);
+ } else {
+ arc_reg_clr(priv, R_CTRL, PROM_MASK);
+
+ if (ndev->flags & IFF_ALLMULTI) {
+ arc_reg_set(priv, R_LAFL, ~0);
+ arc_reg_set(priv, R_LAFH, ~0);
+ } else if (ndev->flags & IFF_MULTICAST) {
+ struct netdev_hw_addr *ha;
+ unsigned int filter[2] = { 0, 0 };
+ int bit;
+
+ netdev_for_each_mc_addr(ha, ndev) {
+ bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26;
+ filter[bit >> 5] |= 1 << (bit & 31);
+ }
+
+ arc_reg_set(priv, R_LAFL, filter[0]);
+ arc_reg_set(priv, R_LAFH, filter[1]);
+ } else {
+ arc_reg_set(priv, R_LAFL, 0);
+ arc_reg_set(priv, R_LAFH, 0);
+ }
+ }
+}
+
+/**
+ * arc_free_tx_queue - free skb from tx queue
+ * @ndev: Pointer to the network device.
+ *
+ * This function must be called while EMAC disable
+ */
+static void arc_free_tx_queue(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int i;
+
+ for (i = 0; i < TX_BD_NUM; i++) {
+ struct arc_emac_bd *txbd = &priv->txbd[i];
+ struct buffer_state *tx_buff = &priv->tx_buff[i];
+
+ if (tx_buff->skb) {
+ dma_unmap_single(&ndev->dev,
+ dma_unmap_addr(tx_buff, addr),
+ dma_unmap_len(tx_buff, len),
+ DMA_TO_DEVICE);
+
+ /* return the sk_buff to system */
+ dev_kfree_skb_irq(tx_buff->skb);
+ }
+
+ txbd->info = 0;
+ txbd->data = 0;
+ tx_buff->skb = NULL;
+ }
+}
+
+/**
+ * arc_free_rx_queue - free skb from rx queue
+ * @ndev: Pointer to the network device.
+ *
+ * This function must be called while EMAC disable
+ */
+static void arc_free_rx_queue(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int i;
+
+ for (i = 0; i < RX_BD_NUM; i++) {
+ struct arc_emac_bd *rxbd = &priv->rxbd[i];
+ struct buffer_state *rx_buff = &priv->rx_buff[i];
+
+ if (rx_buff->skb) {
+ dma_unmap_single(&ndev->dev,
+ dma_unmap_addr(rx_buff, addr),
+ dma_unmap_len(rx_buff, len),
+ DMA_FROM_DEVICE);
+
+ /* return the sk_buff to system */
+ dev_kfree_skb_irq(rx_buff->skb);
+ }
+
+ rxbd->info = 0;
+ rxbd->data = 0;
+ rx_buff->skb = NULL;
+ }
+}
+
+/**
+ * arc_emac_stop - Close the network device.
+ * @ndev: Pointer to the network device.
+ *
+ * This function stops the Tx queue, disables interrupts and frees the IRQ for
+ * the EMAC device.
+ * It also disconnects the PHY device associated with the EMAC device.
+ */
+static int arc_emac_stop(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+
+ napi_disable(&priv->napi);
+ netif_stop_queue(ndev);
+
+ phy_stop(ndev->phydev);
+
+ /* Disable interrupts */
+ arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
+
+ /* Disable EMAC */
+ arc_reg_clr(priv, R_CTRL, EN_MASK);
+
+ /* Return the sk_buff to system */
+ arc_free_tx_queue(ndev);
+ arc_free_rx_queue(ndev);
+
+ return 0;
+}
+
+/**
+ * arc_emac_stats - Get system network statistics.
+ * @ndev: Pointer to net_device structure.
+ *
+ * Returns the address of the device statistics structure.
+ * Statistics are updated in interrupt handler.
+ */
+static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ unsigned long miss, rxerr;
+ u8 rxcrc, rxfram, rxoflow;
+
+ rxerr = arc_reg_get(priv, R_RXERR);
+ miss = arc_reg_get(priv, R_MISS);
+
+ rxcrc = rxerr;
+ rxfram = rxerr >> 8;
+ rxoflow = rxerr >> 16;
+
+ stats->rx_errors += miss;
+ stats->rx_errors += rxcrc + rxfram + rxoflow;
+
+ stats->rx_over_errors += rxoflow;
+ stats->rx_frame_errors += rxfram;
+ stats->rx_crc_errors += rxcrc;
+ stats->rx_missed_errors += miss;
+
+ return stats;
+}
+
+/**
+ * arc_emac_tx - Starts the data transmission.
+ * @skb: sk_buff pointer that contains data to be Transmitted.
+ * @ndev: Pointer to net_device structure.
+ *
+ * returns: NETDEV_TX_OK, on success
+ * NETDEV_TX_BUSY, if any of the descriptors are not free.
+ *
+ * This function is invoked from upper layers to initiate transmission.
+ */
+static netdev_tx_t arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int len, *txbd_curr = &priv->txbd_curr;
+ struct net_device_stats *stats = &ndev->stats;
+ __le32 *info = &priv->txbd[*txbd_curr].info;
+ dma_addr_t addr;
+
+ if (skb_padto(skb, ETH_ZLEN))
+ return NETDEV_TX_OK;
+
+ len = max_t(unsigned int, ETH_ZLEN, skb->len);
+
+ if (unlikely(!arc_emac_tx_avail(priv))) {
+ netif_stop_queue(ndev);
+ netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
+ DMA_TO_DEVICE);
+
+ if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
+ stats->tx_dropped++;
+ stats->tx_errors++;
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+ dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
+ dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
+
+ priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
+
+ /* Make sure pointer to data buffer is set */
+ wmb();
+
+ skb_tx_timestamp(skb);
+
+ *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
+
+ /* Make sure info word is set */
+ wmb();
+
+ priv->tx_buff[*txbd_curr].skb = skb;
+
+ /* Increment index to point to the next BD */
+ *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
+
+ /* Ensure that tx_clean() sees the new txbd_curr before
+ * checking the queue status. This prevents an unneeded wake
+ * of the queue in tx_clean().
+ */
+ smp_mb();
+
+ if (!arc_emac_tx_avail(priv)) {
+ netif_stop_queue(ndev);
+ /* Refresh tx_dirty */
+ smp_mb();
+ if (arc_emac_tx_avail(priv))
+ netif_start_queue(ndev);
+ }
+
+ arc_reg_set(priv, R_STATUS, TXPL_MASK);
+
+ return NETDEV_TX_OK;
+}
+
+static void arc_emac_set_address_internal(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ unsigned int addr_low, addr_hi;
+
+ addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]);
+ addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]);
+
+ arc_reg_set(priv, R_ADDRL, addr_low);
+ arc_reg_set(priv, R_ADDRH, addr_hi);
+}
+
+/**
+ * arc_emac_set_address - Set the MAC address for this device.
+ * @ndev: Pointer to net_device structure.
+ * @p: 6 byte Address to be written as MAC address.
+ *
+ * This function copies the HW address from the sockaddr structure to the
+ * net_device structure and updates the address in HW.
+ *
+ * returns: -EBUSY if the net device is busy or 0 if the address is set
+ * successfully.
+ */
+static int arc_emac_set_address(struct net_device *ndev, void *p)
+{
+ struct sockaddr *addr = p;
+
+ if (netif_running(ndev))
+ return -EBUSY;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ eth_hw_addr_set(ndev, addr->sa_data);
+
+ arc_emac_set_address_internal(ndev);
+
+ return 0;
+}
+
+/**
+ * arc_emac_restart - Restart EMAC
+ * @ndev: Pointer to net_device structure.
+ *
+ * This function do hardware reset of EMAC in order to restore
+ * network packets reception.
+ */
+static void arc_emac_restart(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ int i;
+
+ if (net_ratelimit())
+ netdev_warn(ndev, "restarting stalled EMAC\n");
+
+ netif_stop_queue(ndev);
+
+ /* Disable interrupts */
+ arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
+
+ /* Disable EMAC */
+ arc_reg_clr(priv, R_CTRL, EN_MASK);
+
+ /* Return the sk_buff to system */
+ arc_free_tx_queue(ndev);
+
+ /* Clean Tx BD's */
+ priv->txbd_curr = 0;
+ priv->txbd_dirty = 0;
+ memset(priv->txbd, 0, TX_RING_SZ);
+
+ for (i = 0; i < RX_BD_NUM; i++) {
+ struct arc_emac_bd *rxbd = &priv->rxbd[i];
+ unsigned int info = le32_to_cpu(rxbd->info);
+
+ if (!(info & FOR_EMAC)) {
+ stats->rx_errors++;
+ stats->rx_dropped++;
+ }
+ /* Return ownership to EMAC */
+ rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
+ }
+ priv->last_rx_bd = 0;
+
+ /* Make sure info is visible to EMAC before enable */
+ wmb();
+
+ /* Enable interrupts */
+ arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
+
+ /* Enable EMAC */
+ arc_reg_or(priv, R_CTRL, EN_MASK);
+
+ netif_start_queue(ndev);
+}
+
+static const struct net_device_ops arc_emac_netdev_ops = {
+ .ndo_open = arc_emac_open,
+ .ndo_stop = arc_emac_stop,
+ .ndo_start_xmit = arc_emac_tx,
+ .ndo_set_mac_address = arc_emac_set_address,
+ .ndo_get_stats = arc_emac_stats,
+ .ndo_set_rx_mode = arc_emac_set_rx_mode,
+ .ndo_eth_ioctl = phy_do_ioctl_running,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = arc_emac_poll_controller,
+#endif
+};
+
+int arc_emac_probe(struct net_device *ndev, int interface)
+{
+ struct device *dev = ndev->dev.parent;
+ struct resource res_regs;
+ struct device_node *phy_node;
+ struct phy_device *phydev = NULL;
+ struct arc_emac_priv *priv;
+ unsigned int id, clock_frequency, irq;
+ int err;
+
+ /* Get PHY from device tree */
+ phy_node = of_parse_phandle(dev->of_node, "phy", 0);
+ if (!phy_node) {
+ dev_err(dev, "failed to retrieve phy description from device tree\n");
+ return -ENODEV;
+ }
+
+ /* Get EMAC registers base address from device tree */
+ err = of_address_to_resource(dev->of_node, 0, &res_regs);
+ if (err) {
+ dev_err(dev, "failed to retrieve registers base from device tree\n");
+ err = -ENODEV;
+ goto out_put_node;
+ }
+
+ /* Get IRQ from device tree */
+ irq = irq_of_parse_and_map(dev->of_node, 0);
+ if (!irq) {
+ dev_err(dev, "failed to retrieve <irq> value from device tree\n");
+ err = -ENODEV;
+ goto out_put_node;
+ }
+
+ ndev->netdev_ops = &arc_emac_netdev_ops;
+ ndev->ethtool_ops = &arc_emac_ethtool_ops;
+ ndev->watchdog_timeo = TX_TIMEOUT;
+
+ priv = netdev_priv(ndev);
+ priv->dev = dev;
+
+ priv->regs = devm_ioremap_resource(dev, &res_regs);
+ if (IS_ERR(priv->regs)) {
+ err = PTR_ERR(priv->regs);
+ goto out_put_node;
+ }
+
+ dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs);
+
+ if (priv->clk) {
+ err = clk_prepare_enable(priv->clk);
+ if (err) {
+ dev_err(dev, "failed to enable clock\n");
+ goto out_put_node;
+ }
+
+ clock_frequency = clk_get_rate(priv->clk);
+ } else {
+ /* Get CPU clock frequency from device tree */
+ if (of_property_read_u32(dev->of_node, "clock-frequency",
+ &clock_frequency)) {
+ dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n");
+ err = -EINVAL;
+ goto out_put_node;
+ }
+ }
+
+ id = arc_reg_get(priv, R_ID);
+
+ /* Check for EMAC revision 5 or 7, magic number */
+ if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
+ dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id);
+ err = -ENODEV;
+ goto out_clken;
+ }
+ dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id);
+
+ /* Set poll rate so that it polls every 1 ms */
+ arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
+
+ ndev->irq = irq;
+ dev_info(dev, "IRQ is %d\n", ndev->irq);
+
+ /* Register interrupt handler for device */
+ err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0,
+ ndev->name, ndev);
+ if (err) {
+ dev_err(dev, "could not allocate IRQ\n");
+ goto out_clken;
+ }
+
+ /* Get MAC address from device tree */
+ err = of_get_ethdev_address(dev->of_node, ndev);
+ if (err)
+ eth_hw_addr_random(ndev);
+
+ arc_emac_set_address_internal(ndev);
+ dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
+
+ /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
+ priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ,
+ &priv->rxbd_dma, GFP_KERNEL);
+
+ if (!priv->rxbd) {
+ dev_err(dev, "failed to allocate data buffers\n");
+ err = -ENOMEM;
+ goto out_clken;
+ }
+
+ priv->txbd = priv->rxbd + RX_BD_NUM;
+
+ priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
+ dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
+ (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
+
+ err = arc_mdio_probe(priv);
+ if (err) {
+ dev_err(dev, "failed to probe MII bus\n");
+ goto out_clken;
+ }
+
+ phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
+ interface);
+ if (!phydev) {
+ dev_err(dev, "of_phy_connect() failed\n");
+ err = -ENODEV;
+ goto out_mdio;
+ }
+
+ dev_info(dev, "connected to %s phy with id 0x%x\n",
+ phydev->drv->name, phydev->phy_id);
+
+ netif_napi_add_weight(ndev, &priv->napi, arc_emac_poll,
+ ARC_EMAC_NAPI_WEIGHT);
+
+ err = register_netdev(ndev);
+ if (err) {
+ dev_err(dev, "failed to register network device\n");
+ goto out_netif_api;
+ }
+
+ of_node_put(phy_node);
+ return 0;
+
+out_netif_api:
+ netif_napi_del(&priv->napi);
+ phy_disconnect(phydev);
+out_mdio:
+ arc_mdio_remove(priv);
+out_clken:
+ if (priv->clk)
+ clk_disable_unprepare(priv->clk);
+out_put_node:
+ of_node_put(phy_node);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(arc_emac_probe);
+
+void arc_emac_remove(struct net_device *ndev)
+{
+ struct arc_emac_priv *priv = netdev_priv(ndev);
+
+ phy_disconnect(ndev->phydev);
+ arc_mdio_remove(priv);
+ unregister_netdev(ndev);
+ netif_napi_del(&priv->napi);
+
+ if (!IS_ERR(priv->clk))
+ clk_disable_unprepare(priv->clk);
+}
+EXPORT_SYMBOL_GPL(arc_emac_remove);
+
+MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
+MODULE_DESCRIPTION("ARC EMAC driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/arc/emac_mdio.c b/drivers/net/ethernet/arc/emac_mdio.c
new file mode 100644
index 0000000000..87f40c2ba9
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac_mdio.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * MDIO implementation for ARC EMAC
+ */
+
+#include <linux/delay.h>
+#include <linux/of_mdio.h>
+#include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
+
+#include "emac.h"
+
+/* Number of seconds we wait for "MDIO complete" flag to appear */
+#define ARC_MDIO_COMPLETE_POLL_COUNT 1
+
+/**
+ * arc_mdio_complete_wait - Waits until MDIO transaction is completed.
+ * @priv: Pointer to ARC EMAC private data structure.
+ *
+ * returns: 0 on success, -ETIMEDOUT on a timeout.
+ */
+static int arc_mdio_complete_wait(struct arc_emac_priv *priv)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARC_MDIO_COMPLETE_POLL_COUNT * 40; i++) {
+ unsigned int status = arc_reg_get(priv, R_STATUS);
+
+ status &= MDIO_MASK;
+
+ if (status) {
+ /* Reset "MDIO complete" flag */
+ arc_reg_set(priv, R_STATUS, status);
+ return 0;
+ }
+
+ msleep(25);
+ }
+
+ return -ETIMEDOUT;
+}
+
+/**
+ * arc_mdio_read - MDIO interface read function.
+ * @bus: Pointer to MII bus structure.
+ * @phy_addr: Address of the PHY device.
+ * @reg_num: PHY register to read.
+ *
+ * returns: The register contents on success, -ETIMEDOUT on a timeout.
+ *
+ * Reads the contents of the requested register from the requested PHY
+ * address.
+ */
+static int arc_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
+{
+ struct arc_emac_priv *priv = bus->priv;
+ unsigned int value;
+ int error;
+
+ arc_reg_set(priv, R_MDIO,
+ 0x60020000 | (phy_addr << 23) | (reg_num << 18));
+
+ error = arc_mdio_complete_wait(priv);
+ if (error < 0)
+ return error;
+
+ value = arc_reg_get(priv, R_MDIO) & 0xffff;
+
+ dev_dbg(priv->dev, "arc_mdio_read(phy_addr=%i, reg_num=%x) = %x\n",
+ phy_addr, reg_num, value);
+
+ return value;
+}
+
+/**
+ * arc_mdio_write - MDIO interface write function.
+ * @bus: Pointer to MII bus structure.
+ * @phy_addr: Address of the PHY device.
+ * @reg_num: PHY register to write to.
+ * @value: Value to be written into the register.
+ *
+ * returns: 0 on success, -ETIMEDOUT on a timeout.
+ *
+ * Writes the value to the requested register.
+ */
+static int arc_mdio_write(struct mii_bus *bus, int phy_addr,
+ int reg_num, u16 value)
+{
+ struct arc_emac_priv *priv = bus->priv;
+
+ dev_dbg(priv->dev,
+ "arc_mdio_write(phy_addr=%i, reg_num=%x, value=%x)\n",
+ phy_addr, reg_num, value);
+
+ arc_reg_set(priv, R_MDIO,
+ 0x50020000 | (phy_addr << 23) | (reg_num << 18) | value);
+
+ return arc_mdio_complete_wait(priv);
+}
+
+/**
+ * arc_mdio_reset
+ * @bus: points to the mii_bus structure
+ * Description: reset the MII bus
+ */
+static int arc_mdio_reset(struct mii_bus *bus)
+{
+ struct arc_emac_priv *priv = bus->priv;
+ struct arc_emac_mdio_bus_data *data = &priv->bus_data;
+
+ if (data->reset_gpio) {
+ gpiod_set_value_cansleep(data->reset_gpio, 1);
+ msleep(data->msec);
+ gpiod_set_value_cansleep(data->reset_gpio, 0);
+ }
+
+ return 0;
+}
+
+/**
+ * arc_mdio_probe - MDIO probe function.
+ * @priv: Pointer to ARC EMAC private data structure.
+ *
+ * returns: 0 on success, -ENOMEM when mdiobus_alloc
+ * (to allocate memory for MII bus structure) fails.
+ *
+ * Sets up and registers the MDIO interface.
+ */
+int arc_mdio_probe(struct arc_emac_priv *priv)
+{
+ struct arc_emac_mdio_bus_data *data = &priv->bus_data;
+ struct device_node *np = priv->dev->of_node;
+ const char *name = "Synopsys MII Bus";
+ struct mii_bus *bus;
+ int error;
+
+ bus = mdiobus_alloc();
+ if (!bus)
+ return -ENOMEM;
+
+ priv->bus = bus;
+ bus->priv = priv;
+ bus->parent = priv->dev;
+ bus->name = name;
+ bus->read = &arc_mdio_read;
+ bus->write = &arc_mdio_write;
+ bus->reset = &arc_mdio_reset;
+
+ /* optional reset-related properties */
+ data->reset_gpio = devm_gpiod_get_optional(priv->dev, "phy-reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(data->reset_gpio)) {
+ mdiobus_free(bus);
+ return dev_err_probe(priv->dev, PTR_ERR(data->reset_gpio),
+ "Failed to request gpio\n");
+ }
+
+ of_property_read_u32(np, "phy-reset-duration", &data->msec);
+ /* A sane reset duration should not be longer than 1s */
+ if (data->msec > 1000)
+ data->msec = 1;
+
+ snprintf(bus->id, MII_BUS_ID_SIZE, "%s", bus->name);
+
+ error = of_mdiobus_register(bus, priv->dev->of_node);
+ if (error) {
+ mdiobus_free(bus);
+ return dev_err_probe(priv->dev, error,
+ "cannot register MDIO bus %s\n", name);
+ }
+
+ return 0;
+}
+
+/**
+ * arc_mdio_remove - MDIO remove function.
+ * @priv: Pointer to ARC EMAC private data structure.
+ *
+ * Unregisters the MDIO and frees any associate memory for MII bus.
+ */
+int arc_mdio_remove(struct arc_emac_priv *priv)
+{
+ mdiobus_unregister(priv->bus);
+ mdiobus_free(priv->bus);
+ priv->bus = NULL;
+
+ return 0;
+}
diff --git a/drivers/net/ethernet/arc/emac_rockchip.c b/drivers/net/ethernet/arc/emac_rockchip.c
new file mode 100644
index 0000000000..5091011122
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac_rockchip.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * emac-rockchip.c - Rockchip EMAC specific glue layer
+ *
+ * Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "emac.h"
+
+#define DRV_NAME "rockchip_emac"
+
+struct emac_rockchip_soc_data {
+ unsigned int grf_offset;
+ unsigned int grf_mode_offset;
+ unsigned int grf_speed_offset;
+ bool need_div_macclk;
+};
+
+struct rockchip_priv_data {
+ struct arc_emac_priv emac;
+ struct regmap *grf;
+ const struct emac_rockchip_soc_data *soc_data;
+ struct regulator *regulator;
+ struct clk *refclk;
+ struct clk *macclk;
+};
+
+static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
+{
+ struct rockchip_priv_data *emac = priv;
+ u32 speed_offset = emac->soc_data->grf_speed_offset;
+ u32 data;
+ int err = 0;
+
+ switch (speed) {
+ case 10:
+ data = (1 << (speed_offset + 16)) | (0 << speed_offset);
+ break;
+ case 100:
+ data = (1 << (speed_offset + 16)) | (1 << speed_offset);
+ break;
+ default:
+ pr_err("speed %u not supported\n", speed);
+ return;
+ }
+
+ err = regmap_write(emac->grf, emac->soc_data->grf_offset, data);
+ if (err)
+ pr_err("unable to apply speed %u to grf (%d)\n", speed, err);
+}
+
+static const struct emac_rockchip_soc_data emac_rk3036_emac_data = {
+ .grf_offset = 0x140, .grf_mode_offset = 8,
+ .grf_speed_offset = 9, .need_div_macclk = 1,
+};
+
+static const struct emac_rockchip_soc_data emac_rk3066_emac_data = {
+ .grf_offset = 0x154, .grf_mode_offset = 0,
+ .grf_speed_offset = 1, .need_div_macclk = 0,
+};
+
+static const struct emac_rockchip_soc_data emac_rk3188_emac_data = {
+ .grf_offset = 0x0a4, .grf_mode_offset = 0,
+ .grf_speed_offset = 1, .need_div_macclk = 0,
+};
+
+static const struct of_device_id emac_rockchip_dt_ids[] = {
+ {
+ .compatible = "rockchip,rk3036-emac",
+ .data = &emac_rk3036_emac_data,
+ },
+ {
+ .compatible = "rockchip,rk3066-emac",
+ .data = &emac_rk3066_emac_data,
+ },
+ {
+ .compatible = "rockchip,rk3188-emac",
+ .data = &emac_rk3188_emac_data,
+ },
+ { /* Sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, emac_rockchip_dt_ids);
+
+static int emac_rockchip_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct net_device *ndev;
+ struct rockchip_priv_data *priv;
+ const struct of_device_id *match;
+ phy_interface_t interface;
+ u32 data;
+ int err;
+
+ if (!pdev->dev.of_node)
+ return -ENODEV;
+
+ ndev = alloc_etherdev(sizeof(struct rockchip_priv_data));
+ if (!ndev)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, ndev);
+ SET_NETDEV_DEV(ndev, dev);
+
+ priv = netdev_priv(ndev);
+ priv->emac.drv_name = DRV_NAME;
+ priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
+
+ err = of_get_phy_mode(dev->of_node, &interface);
+ if (err)
+ goto out_netdev;
+
+ /* RK3036/RK3066/RK3188 SoCs only support RMII */
+ if (interface != PHY_INTERFACE_MODE_RMII) {
+ dev_err(dev, "unsupported phy interface mode %d\n", interface);
+ err = -ENOTSUPP;
+ goto out_netdev;
+ }
+
+ priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "rockchip,grf");
+ if (IS_ERR(priv->grf)) {
+ dev_err(dev, "failed to retrieve global register file (%ld)\n",
+ PTR_ERR(priv->grf));
+ err = PTR_ERR(priv->grf);
+ goto out_netdev;
+ }
+
+ match = of_match_node(emac_rockchip_dt_ids, dev->of_node);
+ priv->soc_data = match->data;
+
+ priv->emac.clk = devm_clk_get(dev, "hclk");
+ if (IS_ERR(priv->emac.clk)) {
+ dev_err(dev, "failed to retrieve host clock (%ld)\n",
+ PTR_ERR(priv->emac.clk));
+ err = PTR_ERR(priv->emac.clk);
+ goto out_netdev;
+ }
+
+ priv->refclk = devm_clk_get(dev, "macref");
+ if (IS_ERR(priv->refclk)) {
+ dev_err(dev, "failed to retrieve reference clock (%ld)\n",
+ PTR_ERR(priv->refclk));
+ err = PTR_ERR(priv->refclk);
+ goto out_netdev;
+ }
+
+ err = clk_prepare_enable(priv->refclk);
+ if (err) {
+ dev_err(dev, "failed to enable reference clock (%d)\n", err);
+ goto out_netdev;
+ }
+
+ /* Optional regulator for PHY */
+ priv->regulator = devm_regulator_get_optional(dev, "phy");
+ if (IS_ERR(priv->regulator)) {
+ if (PTR_ERR(priv->regulator) == -EPROBE_DEFER) {
+ err = -EPROBE_DEFER;
+ goto out_clk_disable;
+ }
+ dev_err(dev, "no regulator found\n");
+ priv->regulator = NULL;
+ }
+
+ if (priv->regulator) {
+ err = regulator_enable(priv->regulator);
+ if (err) {
+ dev_err(dev, "failed to enable phy-supply (%d)\n", err);
+ goto out_clk_disable;
+ }
+ }
+
+ /* Set speed 100M */
+ data = (1 << (priv->soc_data->grf_speed_offset + 16)) |
+ (1 << priv->soc_data->grf_speed_offset);
+ /* Set RMII mode */
+ data |= (1 << (priv->soc_data->grf_mode_offset + 16)) |
+ (0 << priv->soc_data->grf_mode_offset);
+
+ err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
+ if (err) {
+ dev_err(dev, "unable to apply initial settings to grf (%d)\n",
+ err);
+ goto out_regulator_disable;
+ }
+
+ /* RMII interface needs always a rate of 50MHz */
+ err = clk_set_rate(priv->refclk, 50000000);
+ if (err) {
+ dev_err(dev,
+ "failed to change reference clock rate (%d)\n", err);
+ goto out_regulator_disable;
+ }
+
+ if (priv->soc_data->need_div_macclk) {
+ priv->macclk = devm_clk_get(dev, "macclk");
+ if (IS_ERR(priv->macclk)) {
+ dev_err(dev, "failed to retrieve mac clock (%ld)\n",
+ PTR_ERR(priv->macclk));
+ err = PTR_ERR(priv->macclk);
+ goto out_regulator_disable;
+ }
+
+ err = clk_prepare_enable(priv->macclk);
+ if (err) {
+ dev_err(dev, "failed to enable mac clock (%d)\n", err);
+ goto out_regulator_disable;
+ }
+
+ /* RMII TX/RX needs always a rate of 25MHz */
+ err = clk_set_rate(priv->macclk, 25000000);
+ if (err) {
+ dev_err(dev,
+ "failed to change mac clock rate (%d)\n", err);
+ goto out_clk_disable_macclk;
+ }
+ }
+
+ err = arc_emac_probe(ndev, interface);
+ if (err) {
+ dev_err(dev, "failed to probe arc emac (%d)\n", err);
+ goto out_clk_disable_macclk;
+ }
+
+ return 0;
+
+out_clk_disable_macclk:
+ if (priv->soc_data->need_div_macclk)
+ clk_disable_unprepare(priv->macclk);
+out_regulator_disable:
+ if (priv->regulator)
+ regulator_disable(priv->regulator);
+out_clk_disable:
+ clk_disable_unprepare(priv->refclk);
+out_netdev:
+ free_netdev(ndev);
+ return err;
+}
+
+static int emac_rockchip_remove(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct rockchip_priv_data *priv = netdev_priv(ndev);
+
+ arc_emac_remove(ndev);
+
+ clk_disable_unprepare(priv->refclk);
+
+ if (priv->regulator)
+ regulator_disable(priv->regulator);
+
+ if (priv->soc_data->need_div_macclk)
+ clk_disable_unprepare(priv->macclk);
+
+ free_netdev(ndev);
+ return 0;
+}
+
+static struct platform_driver emac_rockchip_driver = {
+ .probe = emac_rockchip_probe,
+ .remove = emac_rockchip_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = emac_rockchip_dt_ids,
+ },
+};
+
+module_platform_driver(emac_rockchip_driver);
+
+MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
+MODULE_DESCRIPTION("Rockchip EMAC platform driver");
+MODULE_LICENSE("GPL");