diff options
Diffstat (limited to 'drivers/net/ethernet/arc')
| -rw-r--r-- | drivers/net/ethernet/arc/Kconfig | 31 | ||||
| -rw-r--r-- | drivers/net/ethernet/arc/Makefile | 6 | ||||
| -rw-r--r-- | drivers/net/ethernet/arc/emac.h | 214 | ||||
| -rw-r--r-- | drivers/net/ethernet/arc/emac_main.c | 887 | ||||
| -rw-r--r-- | drivers/net/ethernet/arc/emac_mdio.c | 152 |
5 files changed, 1290 insertions, 0 deletions
diff --git a/drivers/net/ethernet/arc/Kconfig b/drivers/net/ethernet/arc/Kconfig new file mode 100644 index 00000000000..514c57fd26f --- /dev/null +++ b/drivers/net/ethernet/arc/Kconfig @@ -0,0 +1,31 @@ +# +# 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 + and read the Ethernet-HOWTO, available from + <http://www.tldp.org/docs.html#howto>. + + 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 + tristate "ARC EMAC support" + select MII + select PHYLIB + depends on OF_IRQ + depends on OF_NET + ---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. + +endif # NET_VENDOR_ARC diff --git a/drivers/net/ethernet/arc/Makefile b/drivers/net/ethernet/arc/Makefile new file mode 100644 index 00000000000..00c8657637d --- /dev/null +++ b/drivers/net/ethernet/arc/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for the ARC network device drivers. +# + +arc_emac-objs := emac_main.o emac_mdio.o +obj-$(CONFIG_ARC_EMAC) += arc_emac.o diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h new file mode 100644 index 00000000000..53f85bf7152 --- /dev/null +++ b/drivers/net/ethernet/arc/emac.h @@ -0,0 +1,214 @@ +/* + * 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 owns buffer, 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_priv - Storage of EMAC's private information. + * @dev: Pointer to the current device. + * @ndev: Pointer to the current network 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. + * @stats: Network device statistics. + * @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 { + /* Devices */ + struct device *dev; + struct net_device *ndev; + struct phy_device *phy_dev; + struct mii_bus *bus; + + void __iomem *regs; + struct clk *clk; + + struct napi_struct napi; + struct net_device_stats stats; + + 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; +}; + +/** + * 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 platform_device *pdev, struct arc_emac_priv *priv); +int arc_mdio_remove(struct arc_emac_priv *priv); + +#endif /* ARC_EMAC_H */ diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c new file mode 100644 index 00000000000..18e2faccebb --- /dev/null +++ b/drivers/net/ethernet/arc/emac_main.c @@ -0,0 +1,887 @@ +/* + * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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_address.h> +#include <linux/of_irq.h> +#include <linux/of_mdio.h> +#include <linux/of_net.h> +#include <linux/of_platform.h> + +#include "emac.h" + +#define DRV_NAME "arc_emac" +#define DRV_VERSION "1.0" + +/** + * 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 = priv->phy_dev; + 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->duplex != phy_dev->duplex) { + reg = arc_reg_get(priv, R_CTRL); + + if (DUPLEX_FULL == phy_dev->duplex) + 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_settings - Get PHY settings. + * @ndev: Pointer to net_device structure. + * @cmd: Pointer to ethtool_cmd structure. + * + * This implements ethtool command for getting PHY settings. If PHY could + * not be found, the function returns -ENODEV. This function calls the + * relevant PHY ethtool API to get the PHY settings. + * Issue "ethtool ethX" under linux prompt to execute this function. + */ +static int arc_emac_get_settings(struct net_device *ndev, + struct ethtool_cmd *cmd) +{ + struct arc_emac_priv *priv = netdev_priv(ndev); + + return phy_ethtool_gset(priv->phy_dev, cmd); +} + +/** + * arc_emac_set_settings - Set PHY settings as passed in the argument. + * @ndev: Pointer to net_device structure. + * @cmd: Pointer to ethtool_cmd structure. + * + * This implements ethtool command for setting various PHY settings. If PHY + * could not be found, the function returns -ENODEV. This function calls the + * relevant PHY ethtool API to set the PHY. + * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this + * function. + */ +static int arc_emac_set_settings(struct net_device *ndev, + struct ethtool_cmd *cmd) +{ + struct arc_emac_priv *priv = netdev_priv(ndev); + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + return phy_ethtool_sset(priv->phy_dev, cmd); +} + +/** + * 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) +{ + strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); + strlcpy(info->version, DRV_VERSION, sizeof(info->version)); +} + +static const struct ethtool_ops arc_emac_ethtool_ops = { + .get_settings = arc_emac_get_settings, + .set_settings = arc_emac_set_settings, + .get_drvinfo = arc_emac_get_drvinfo, + .get_link = ethtool_op_get_link, +}; + +#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 = &priv->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) + 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_kfree_skb_irq(skb); + + txbd->data = 0; + txbd->info = 0; + + *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; + + if (netif_queue_stopped(ndev)) + 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 = &priv->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; + } + + pktlen = info & LEN_MASK; + stats->rx_packets++; + stats->rx_bytes += pktlen; + skb = rx_buff->skb; + skb_put(skb, pktlen); + skb->dev = ndev; + skb->protocol = eth_type_trans(skb, ndev); + + dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), + dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); + + /* Prepare the BD for next cycle */ + rx_buff->skb = netdev_alloc_skb_ip_align(ndev, + EMAC_BUFFER_SIZE); + if (unlikely(!rx_buff->skb)) { + stats->rx_errors++; + /* Because receive_skb is below, increment rx_dropped */ + stats->rx_dropped++; + continue; + } + + /* receive_skb only if new skb was allocated to avoid holes */ + netif_receive_skb(skb); + + addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, + EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(&ndev->dev, addr)) { + if (net_ratelimit()) + netdev_err(ndev, "cannot dma map\n"); + dev_kfree_skb(rx_buff->skb); + stats->rx_errors++; + continue; + } + 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_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); + + work_done = arc_emac_rx(ndev, budget); + if (work_done < budget) { + napi_complete(napi); + arc_reg_or(priv, R_ENABLE, RXINT_MASK); + } + + 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 = &priv->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) { + if (likely(napi_schedule_prep(&priv->napi))) { + arc_reg_clr(priv, R_ENABLE, RXINT_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; + } + + 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 = priv->phy_dev; + int i; + + phy_dev->autoneg = AUTONEG_ENABLE; + phy_dev->speed = 0; + phy_dev->duplex = 0; + 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; + } + + /* 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 | 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_aneg(priv->phy_dev); + + 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 { + 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]); + } + } +} + +/** + * 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); + + /* Disable interrupts */ + arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK); + + /* Disable EMAC */ + arc_reg_clr(priv, R_CTRL, EN_MASK); + + 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 = &priv->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 int 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 = &priv->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); + + /* EMAC still holds this buffer in its possession. + * CPU must not modify this buffer descriptor + */ + if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) { + netif_stop_queue(ndev); + 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(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->tx_buff[*txbd_curr].skb = skb; + 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); + + /* Increment index to point to the next BD */ + *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; + + /* Get "info" of the next BD */ + info = &priv->txbd[*txbd_curr].info; + + /* Check if if Tx BD ring is full - next BD is still owned by EMAC */ + if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) + netif_stop_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; + + memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); + + arc_emac_set_address_internal(ndev); + + return 0; +} + +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, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = arc_emac_poll_controller, +#endif +}; + +static int arc_emac_probe(struct platform_device *pdev) +{ + struct resource res_regs; + struct device_node *phy_node; + struct arc_emac_priv *priv; + struct net_device *ndev; + const char *mac_addr; + unsigned int id, clock_frequency, irq; + int err; + + if (!pdev->dev.of_node) + return -ENODEV; + + /* Get PHY from device tree */ + phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0); + if (!phy_node) { + dev_err(&pdev->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(pdev->dev.of_node, 0, &res_regs); + if (err) { + dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n"); + return -ENODEV; + } + + /* Get IRQ from device tree */ + irq = irq_of_parse_and_map(pdev->dev.of_node, 0); + if (!irq) { + dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n"); + return -ENODEV; + } + + ndev = alloc_etherdev(sizeof(struct arc_emac_priv)); + if (!ndev) + return -ENOMEM; + + platform_set_drvdata(pdev, ndev); + SET_NETDEV_DEV(ndev, &pdev->dev); + + ndev->netdev_ops = &arc_emac_netdev_ops; + ndev->ethtool_ops = &arc_emac_ethtool_ops; + ndev->watchdog_timeo = TX_TIMEOUT; + /* FIXME :: no multicast support yet */ + ndev->flags &= ~IFF_MULTICAST; + + priv = netdev_priv(ndev); + priv->dev = &pdev->dev; + priv->ndev = ndev; + + priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs); + if (IS_ERR(priv->regs)) { + err = PTR_ERR(priv->regs); + goto out_netdev; + } + dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs); + + priv->clk = of_clk_get(pdev->dev.of_node, 0); + if (IS_ERR(priv->clk)) { + /* Get CPU clock frequency from device tree */ + if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", + &clock_frequency)) { + dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n"); + err = -EINVAL; + goto out_netdev; + } + } else { + err = clk_prepare_enable(priv->clk); + if (err) { + dev_err(&pdev->dev, "failed to enable clock\n"); + goto out_clkget; + } + + clock_frequency = clk_get_rate(priv->clk); + } + + id = arc_reg_get(priv, R_ID); + + /* Check for EMAC revision 5 or 7, magic number */ + if (!(id == 0x0005fd02 || id == 0x0007fd02)) { + dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id); + err = -ENODEV; + goto out_clken; + } + dev_info(&pdev->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(&pdev->dev, "IRQ is %d\n", ndev->irq); + + /* Register interrupt handler for device */ + err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0, + ndev->name, ndev); + if (err) { + dev_err(&pdev->dev, "could not allocate IRQ\n"); + goto out_clken; + } + + /* Get MAC address from device tree */ + mac_addr = of_get_mac_address(pdev->dev.of_node); + + if (mac_addr) + memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); + else + eth_hw_addr_random(ndev); + + arc_emac_set_address_internal(ndev); + dev_info(&pdev->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(&pdev->dev, RX_RING_SZ + TX_RING_SZ, + &priv->rxbd_dma, GFP_KERNEL); + + if (!priv->rxbd) { + dev_err(&pdev->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(&pdev->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(pdev, priv); + if (err) { + dev_err(&pdev->dev, "failed to probe MII bus\n"); + goto out_clken; + } + + priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, + PHY_INTERFACE_MODE_MII); + if (!priv->phy_dev) { + dev_err(&pdev->dev, "of_phy_connect() failed\n"); + err = -ENODEV; + goto out_mdio; + } + + dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n", + priv->phy_dev->drv->name, priv->phy_dev->phy_id); + + netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); + + err = register_netdev(ndev); + if (err) { + dev_err(&pdev->dev, "failed to register network device\n"); + goto out_netif_api; + } + + return 0; + +out_netif_api: + netif_napi_del(&priv->napi); + phy_disconnect(priv->phy_dev); + priv->phy_dev = NULL; +out_mdio: + arc_mdio_remove(priv); +out_clken: + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); +out_clkget: + if (!IS_ERR(priv->clk)) + clk_put(priv->clk); +out_netdev: + free_netdev(ndev); + return err; +} + +static int arc_emac_remove(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct arc_emac_priv *priv = netdev_priv(ndev); + + phy_disconnect(priv->phy_dev); + priv->phy_dev = NULL; + arc_mdio_remove(priv); + unregister_netdev(ndev); + netif_napi_del(&priv->napi); + + if (!IS_ERR(priv->clk)) { + clk_disable_unprepare(priv->clk); + clk_put(priv->clk); + } + + free_netdev(ndev); + + return 0; +} + +static const struct of_device_id arc_emac_dt_ids[] = { + { .compatible = "snps,arc-emac" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, arc_emac_dt_ids); + +static struct platform_driver arc_emac_driver = { + .probe = arc_emac_probe, + .remove = arc_emac_remove, + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .of_match_table = arc_emac_dt_ids, + }, +}; + +module_platform_driver(arc_emac_driver); + +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 00000000000..26ba2423f33 --- /dev/null +++ b/drivers/net/ethernet/arc/emac_mdio.c @@ -0,0 +1,152 @@ +/* + * 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 "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_probe - MDIO probe function. + * @pdev: Pointer to platform device. + * @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 platform_device *pdev, struct arc_emac_priv *priv) +{ + 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 = "Synopsys MII Bus", + bus->read = &arc_mdio_read; + bus->write = &arc_mdio_write; + + snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name); + + error = of_mdiobus_register(bus, pdev->dev.of_node); + if (error) { + dev_err(priv->dev, "cannot register MDIO bus %s\n", bus->name); + mdiobus_free(bus); + return error; + } + + 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; +} |