diff options
Diffstat (limited to 'drivers/net/ethernet/rdc/r6040.c')
| -rw-r--r-- | drivers/net/ethernet/rdc/r6040.c | 1215 |
1 files changed, 1215 insertions, 0 deletions
diff --git a/drivers/net/ethernet/rdc/r6040.c b/drivers/net/ethernet/rdc/r6040.c new file mode 100644 index 000000000..f4d434c37 --- /dev/null +++ b/drivers/net/ethernet/rdc/r6040.c @@ -0,0 +1,1215 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RDC R6040 Fast Ethernet MAC support + * + * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw> + * Copyright (C) 2007 + * Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us> + * Copyright (C) 2007-2012 Florian Fainelli <f.fainelli@gmail.com> +*/ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/pci.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/delay.h> +#include <linux/mii.h> +#include <linux/ethtool.h> +#include <linux/crc32.h> +#include <linux/spinlock.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/uaccess.h> +#include <linux/phy.h> + +#include <asm/processor.h> + +#define DRV_NAME "r6040" +#define DRV_VERSION "0.29" +#define DRV_RELDATE "04Jul2016" + +/* Time in jiffies before concluding the transmitter is hung. */ +#define TX_TIMEOUT (6000 * HZ / 1000) + +/* RDC MAC I/O Size */ +#define R6040_IO_SIZE 256 + +/* MAX RDC MAC */ +#define MAX_MAC 2 + +/* MAC registers */ +#define MCR0 0x00 /* Control register 0 */ +#define MCR0_RCVEN 0x0002 /* Receive enable */ +#define MCR0_PROMISC 0x0020 /* Promiscuous mode */ +#define MCR0_HASH_EN 0x0100 /* Enable multicast hash table function */ +#define MCR0_XMTEN 0x1000 /* Transmission enable */ +#define MCR0_FD 0x8000 /* Full/Half duplex */ +#define MCR1 0x04 /* Control register 1 */ +#define MAC_RST 0x0001 /* Reset the MAC */ +#define MBCR 0x08 /* Bus control */ +#define MT_ICR 0x0C /* TX interrupt control */ +#define MR_ICR 0x10 /* RX interrupt control */ +#define MTPR 0x14 /* TX poll command register */ +#define TM2TX 0x0001 /* Trigger MAC to transmit */ +#define MR_BSR 0x18 /* RX buffer size */ +#define MR_DCR 0x1A /* RX descriptor control */ +#define MLSR 0x1C /* Last status */ +#define TX_FIFO_UNDR 0x0200 /* TX FIFO under-run */ +#define TX_EXCEEDC 0x2000 /* Transmit exceed collision */ +#define TX_LATEC 0x4000 /* Transmit late collision */ +#define MMDIO 0x20 /* MDIO control register */ +#define MDIO_WRITE 0x4000 /* MDIO write */ +#define MDIO_READ 0x2000 /* MDIO read */ +#define MMRD 0x24 /* MDIO read data register */ +#define MMWD 0x28 /* MDIO write data register */ +#define MTD_SA0 0x2C /* TX descriptor start address 0 */ +#define MTD_SA1 0x30 /* TX descriptor start address 1 */ +#define MRD_SA0 0x34 /* RX descriptor start address 0 */ +#define MRD_SA1 0x38 /* RX descriptor start address 1 */ +#define MISR 0x3C /* Status register */ +#define MIER 0x40 /* INT enable register */ +#define MSK_INT 0x0000 /* Mask off interrupts */ +#define RX_FINISH 0x0001 /* RX finished */ +#define RX_NO_DESC 0x0002 /* No RX descriptor available */ +#define RX_FIFO_FULL 0x0004 /* RX FIFO full */ +#define RX_EARLY 0x0008 /* RX early */ +#define TX_FINISH 0x0010 /* TX finished */ +#define TX_EARLY 0x0080 /* TX early */ +#define EVENT_OVRFL 0x0100 /* Event counter overflow */ +#define LINK_CHANGED 0x0200 /* PHY link changed */ +#define ME_CISR 0x44 /* Event counter INT status */ +#define ME_CIER 0x48 /* Event counter INT enable */ +#define MR_CNT 0x50 /* Successfully received packet counter */ +#define ME_CNT0 0x52 /* Event counter 0 */ +#define ME_CNT1 0x54 /* Event counter 1 */ +#define ME_CNT2 0x56 /* Event counter 2 */ +#define ME_CNT3 0x58 /* Event counter 3 */ +#define MT_CNT 0x5A /* Successfully transmit packet counter */ +#define ME_CNT4 0x5C /* Event counter 4 */ +#define MP_CNT 0x5E /* Pause frame counter register */ +#define MAR0 0x60 /* Hash table 0 */ +#define MAR1 0x62 /* Hash table 1 */ +#define MAR2 0x64 /* Hash table 2 */ +#define MAR3 0x66 /* Hash table 3 */ +#define MID_0L 0x68 /* Multicast address MID0 Low */ +#define MID_0M 0x6A /* Multicast address MID0 Medium */ +#define MID_0H 0x6C /* Multicast address MID0 High */ +#define MID_1L 0x70 /* MID1 Low */ +#define MID_1M 0x72 /* MID1 Medium */ +#define MID_1H 0x74 /* MID1 High */ +#define MID_2L 0x78 /* MID2 Low */ +#define MID_2M 0x7A /* MID2 Medium */ +#define MID_2H 0x7C /* MID2 High */ +#define MID_3L 0x80 /* MID3 Low */ +#define MID_3M 0x82 /* MID3 Medium */ +#define MID_3H 0x84 /* MID3 High */ +#define PHY_CC 0x88 /* PHY status change configuration register */ +#define SCEN 0x8000 /* PHY status change enable */ +#define PHYAD_SHIFT 8 /* PHY address shift */ +#define TMRDIV_SHIFT 0 /* Timer divider shift */ +#define PHY_ST 0x8A /* PHY status register */ +#define MAC_SM 0xAC /* MAC status machine */ +#define MAC_SM_RST 0x0002 /* MAC status machine reset */ +#define MD_CSC 0xb6 /* MDC speed control register */ +#define MD_CSC_DEFAULT 0x0030 +#define MAC_ID 0xBE /* Identifier register */ + +#define TX_DCNT 0x80 /* TX descriptor count */ +#define RX_DCNT 0x80 /* RX descriptor count */ +#define MAX_BUF_SIZE 0x600 +#define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor)) +#define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor)) +#define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */ +#define MCAST_MAX 3 /* Max number multicast addresses to filter */ + +#define MAC_DEF_TIMEOUT 2048 /* Default MAC read/write operation timeout */ + +/* Descriptor status */ +#define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */ +#define DSC_RX_OK 0x4000 /* RX was successful */ +#define DSC_RX_ERR 0x0800 /* RX PHY error */ +#define DSC_RX_ERR_DRI 0x0400 /* RX dribble packet */ +#define DSC_RX_ERR_BUF 0x0200 /* RX length exceeds buffer size */ +#define DSC_RX_ERR_LONG 0x0100 /* RX length > maximum packet length */ +#define DSC_RX_ERR_RUNT 0x0080 /* RX packet length < 64 byte */ +#define DSC_RX_ERR_CRC 0x0040 /* RX CRC error */ +#define DSC_RX_BCAST 0x0020 /* RX broadcast (no error) */ +#define DSC_RX_MCAST 0x0010 /* RX multicast (no error) */ +#define DSC_RX_MCH_HIT 0x0008 /* RX multicast hit in hash table (no error) */ +#define DSC_RX_MIDH_HIT 0x0004 /* RX MID table hit (no error) */ +#define DSC_RX_IDX_MID_MASK 3 /* RX mask for the index of matched MIDx */ + +MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>," + "Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>," + "Florian Fainelli <f.fainelli@gmail.com>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver"); +MODULE_VERSION(DRV_VERSION " " DRV_RELDATE); + +/* RX and TX interrupts that we handle */ +#define RX_INTS (RX_FIFO_FULL | RX_NO_DESC | RX_FINISH) +#define TX_INTS (TX_FINISH) +#define INT_MASK (RX_INTS | TX_INTS) + +struct r6040_descriptor { + u16 status, len; /* 0-3 */ + __le32 buf; /* 4-7 */ + __le32 ndesc; /* 8-B */ + u32 rev1; /* C-F */ + char *vbufp; /* 10-13 */ + struct r6040_descriptor *vndescp; /* 14-17 */ + struct sk_buff *skb_ptr; /* 18-1B */ + u32 rev2; /* 1C-1F */ +} __aligned(32); + +struct r6040_private { + spinlock_t lock; /* driver lock */ + struct pci_dev *pdev; + struct r6040_descriptor *rx_insert_ptr; + struct r6040_descriptor *rx_remove_ptr; + struct r6040_descriptor *tx_insert_ptr; + struct r6040_descriptor *tx_remove_ptr; + struct r6040_descriptor *rx_ring; + struct r6040_descriptor *tx_ring; + dma_addr_t rx_ring_dma; + dma_addr_t tx_ring_dma; + u16 tx_free_desc; + u16 mcr0; + struct net_device *dev; + struct mii_bus *mii_bus; + struct napi_struct napi; + void __iomem *base; + int old_link; + int old_duplex; +}; + +static char version[] = DRV_NAME + ": RDC R6040 NAPI net driver," + "version "DRV_VERSION " (" DRV_RELDATE ")"; + +/* Read a word data from PHY Chip */ +static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg) +{ + int limit = MAC_DEF_TIMEOUT; + u16 cmd; + + iowrite16(MDIO_READ | reg | (phy_addr << 8), ioaddr + MMDIO); + /* Wait for the read bit to be cleared */ + while (limit--) { + cmd = ioread16(ioaddr + MMDIO); + if (!(cmd & MDIO_READ)) + break; + udelay(1); + } + + if (limit < 0) + return -ETIMEDOUT; + + return ioread16(ioaddr + MMRD); +} + +/* Write a word data from PHY Chip */ +static int r6040_phy_write(void __iomem *ioaddr, + int phy_addr, int reg, u16 val) +{ + int limit = MAC_DEF_TIMEOUT; + u16 cmd; + + iowrite16(val, ioaddr + MMWD); + /* Write the command to the MDIO bus */ + iowrite16(MDIO_WRITE | reg | (phy_addr << 8), ioaddr + MMDIO); + /* Wait for the write bit to be cleared */ + while (limit--) { + cmd = ioread16(ioaddr + MMDIO); + if (!(cmd & MDIO_WRITE)) + break; + udelay(1); + } + + return (limit < 0) ? -ETIMEDOUT : 0; +} + +static int r6040_mdiobus_read(struct mii_bus *bus, int phy_addr, int reg) +{ + struct net_device *dev = bus->priv; + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + + return r6040_phy_read(ioaddr, phy_addr, reg); +} + +static int r6040_mdiobus_write(struct mii_bus *bus, int phy_addr, + int reg, u16 value) +{ + struct net_device *dev = bus->priv; + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + + return r6040_phy_write(ioaddr, phy_addr, reg, value); +} + +static void r6040_free_txbufs(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + int i; + + for (i = 0; i < TX_DCNT; i++) { + if (lp->tx_insert_ptr->skb_ptr) { + dma_unmap_single(&lp->pdev->dev, + le32_to_cpu(lp->tx_insert_ptr->buf), + MAX_BUF_SIZE, DMA_TO_DEVICE); + dev_kfree_skb(lp->tx_insert_ptr->skb_ptr); + lp->tx_insert_ptr->skb_ptr = NULL; + } + lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp; + } +} + +static void r6040_free_rxbufs(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + int i; + + for (i = 0; i < RX_DCNT; i++) { + if (lp->rx_insert_ptr->skb_ptr) { + dma_unmap_single(&lp->pdev->dev, + le32_to_cpu(lp->rx_insert_ptr->buf), + MAX_BUF_SIZE, DMA_FROM_DEVICE); + dev_kfree_skb(lp->rx_insert_ptr->skb_ptr); + lp->rx_insert_ptr->skb_ptr = NULL; + } + lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp; + } +} + +static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring, + dma_addr_t desc_dma, int size) +{ + struct r6040_descriptor *desc = desc_ring; + dma_addr_t mapping = desc_dma; + + while (size-- > 0) { + mapping += sizeof(*desc); + desc->ndesc = cpu_to_le32(mapping); + desc->vndescp = desc + 1; + desc++; + } + desc--; + desc->ndesc = cpu_to_le32(desc_dma); + desc->vndescp = desc_ring; +} + +static void r6040_init_txbufs(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + + lp->tx_free_desc = TX_DCNT; + + lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring; + r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT); +} + +static int r6040_alloc_rxbufs(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + struct r6040_descriptor *desc; + struct sk_buff *skb; + int rc; + + lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring; + r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT); + + /* Allocate skbs for the rx descriptors */ + desc = lp->rx_ring; + do { + skb = netdev_alloc_skb(dev, MAX_BUF_SIZE); + if (!skb) { + rc = -ENOMEM; + goto err_exit; + } + desc->skb_ptr = skb; + desc->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, + desc->skb_ptr->data, + MAX_BUF_SIZE, + DMA_FROM_DEVICE)); + desc->status = DSC_OWNER_MAC; + desc = desc->vndescp; + } while (desc != lp->rx_ring); + + return 0; + +err_exit: + /* Deallocate all previously allocated skbs */ + r6040_free_rxbufs(dev); + return rc; +} + +static void r6040_reset_mac(struct r6040_private *lp) +{ + void __iomem *ioaddr = lp->base; + int limit = MAC_DEF_TIMEOUT; + u16 cmd, md_csc; + + md_csc = ioread16(ioaddr + MD_CSC); + iowrite16(MAC_RST, ioaddr + MCR1); + while (limit--) { + cmd = ioread16(ioaddr + MCR1); + if (cmd & MAC_RST) + break; + } + + /* Reset internal state machine */ + iowrite16(MAC_SM_RST, ioaddr + MAC_SM); + iowrite16(0, ioaddr + MAC_SM); + mdelay(5); + + /* Restore MDIO clock frequency */ + if (md_csc != MD_CSC_DEFAULT) + iowrite16(md_csc, ioaddr + MD_CSC); +} + +static void r6040_init_mac_regs(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + + /* Mask Off Interrupt */ + iowrite16(MSK_INT, ioaddr + MIER); + + /* Reset RDC MAC */ + r6040_reset_mac(lp); + + /* MAC Bus Control Register */ + iowrite16(MBCR_DEFAULT, ioaddr + MBCR); + + /* Buffer Size Register */ + iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR); + + /* Write TX ring start address */ + iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0); + iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1); + + /* Write RX ring start address */ + iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0); + iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1); + + /* Set interrupt waiting time and packet numbers */ + iowrite16(0, ioaddr + MT_ICR); + iowrite16(0, ioaddr + MR_ICR); + + /* Enable interrupts */ + iowrite16(INT_MASK, ioaddr + MIER); + + /* Enable TX and RX */ + iowrite16(lp->mcr0 | MCR0_RCVEN, ioaddr); + + /* Let TX poll the descriptors + * we may got called by r6040_tx_timeout which has left + * some unsent tx buffers */ + iowrite16(TM2TX, ioaddr + MTPR); +} + +static void r6040_tx_timeout(struct net_device *dev, unsigned int txqueue) +{ + struct r6040_private *priv = netdev_priv(dev); + void __iomem *ioaddr = priv->base; + + netdev_warn(dev, "transmit timed out, int enable %4.4x " + "status %4.4x\n", + ioread16(ioaddr + MIER), + ioread16(ioaddr + MISR)); + + dev->stats.tx_errors++; + + /* Reset MAC and re-init all registers */ + r6040_init_mac_regs(dev); +} + +static struct net_device_stats *r6040_get_stats(struct net_device *dev) +{ + struct r6040_private *priv = netdev_priv(dev); + void __iomem *ioaddr = priv->base; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1); + dev->stats.multicast += ioread8(ioaddr + ME_CNT0); + spin_unlock_irqrestore(&priv->lock, flags); + + return &dev->stats; +} + +/* Stop RDC MAC and Free the allocated resource */ +static void r6040_down(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + const u16 *adrp; + + /* Stop MAC */ + iowrite16(MSK_INT, ioaddr + MIER); /* Mask Off Interrupt */ + + /* Reset RDC MAC */ + r6040_reset_mac(lp); + + /* Restore MAC Address to MIDx */ + adrp = (const u16 *) dev->dev_addr; + iowrite16(adrp[0], ioaddr + MID_0L); + iowrite16(adrp[1], ioaddr + MID_0M); + iowrite16(adrp[2], ioaddr + MID_0H); +} + +static int r6040_close(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + struct pci_dev *pdev = lp->pdev; + + phy_stop(dev->phydev); + napi_disable(&lp->napi); + netif_stop_queue(dev); + + spin_lock_irq(&lp->lock); + r6040_down(dev); + + /* Free RX buffer */ + r6040_free_rxbufs(dev); + + /* Free TX buffer */ + r6040_free_txbufs(dev); + + spin_unlock_irq(&lp->lock); + + free_irq(dev->irq, dev); + + /* Free Descriptor memory */ + if (lp->rx_ring) { + dma_free_coherent(&pdev->dev, RX_DESC_SIZE, lp->rx_ring, + lp->rx_ring_dma); + lp->rx_ring = NULL; + } + + if (lp->tx_ring) { + dma_free_coherent(&pdev->dev, TX_DESC_SIZE, lp->tx_ring, + lp->tx_ring_dma); + lp->tx_ring = NULL; + } + + return 0; +} + +static int r6040_rx(struct net_device *dev, int limit) +{ + struct r6040_private *priv = netdev_priv(dev); + struct r6040_descriptor *descptr = priv->rx_remove_ptr; + struct sk_buff *skb_ptr, *new_skb; + int count = 0; + u16 err; + + /* Limit not reached and the descriptor belongs to the CPU */ + while (count < limit && !(descptr->status & DSC_OWNER_MAC)) { + /* Read the descriptor status */ + err = descptr->status; + /* Global error status set */ + if (err & DSC_RX_ERR) { + /* RX dribble */ + if (err & DSC_RX_ERR_DRI) + dev->stats.rx_frame_errors++; + /* Buffer length exceeded */ + if (err & DSC_RX_ERR_BUF) + dev->stats.rx_length_errors++; + /* Packet too long */ + if (err & DSC_RX_ERR_LONG) + dev->stats.rx_length_errors++; + /* Packet < 64 bytes */ + if (err & DSC_RX_ERR_RUNT) + dev->stats.rx_length_errors++; + /* CRC error */ + if (err & DSC_RX_ERR_CRC) { + spin_lock(&priv->lock); + dev->stats.rx_crc_errors++; + spin_unlock(&priv->lock); + } + goto next_descr; + } + + /* Packet successfully received */ + new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE); + if (!new_skb) { + dev->stats.rx_dropped++; + goto next_descr; + } + skb_ptr = descptr->skb_ptr; + skb_ptr->dev = priv->dev; + + /* Do not count the CRC */ + skb_put(skb_ptr, descptr->len - ETH_FCS_LEN); + dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf), + MAX_BUF_SIZE, DMA_FROM_DEVICE); + skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev); + + /* Send to upper layer */ + netif_receive_skb(skb_ptr); + dev->stats.rx_packets++; + dev->stats.rx_bytes += descptr->len - ETH_FCS_LEN; + + /* put new skb into descriptor */ + descptr->skb_ptr = new_skb; + descptr->buf = cpu_to_le32(dma_map_single(&priv->pdev->dev, + descptr->skb_ptr->data, + MAX_BUF_SIZE, + DMA_FROM_DEVICE)); + +next_descr: + /* put the descriptor back to the MAC */ + descptr->status = DSC_OWNER_MAC; + descptr = descptr->vndescp; + count++; + } + priv->rx_remove_ptr = descptr; + + return count; +} + +static void r6040_tx(struct net_device *dev) +{ + struct r6040_private *priv = netdev_priv(dev); + struct r6040_descriptor *descptr; + void __iomem *ioaddr = priv->base; + struct sk_buff *skb_ptr; + u16 err; + + spin_lock(&priv->lock); + descptr = priv->tx_remove_ptr; + while (priv->tx_free_desc < TX_DCNT) { + /* Check for errors */ + err = ioread16(ioaddr + MLSR); + + if (err & TX_FIFO_UNDR) + dev->stats.tx_fifo_errors++; + if (err & (TX_EXCEEDC | TX_LATEC)) + dev->stats.tx_carrier_errors++; + + if (descptr->status & DSC_OWNER_MAC) + break; /* Not complete */ + skb_ptr = descptr->skb_ptr; + + /* Statistic Counter */ + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb_ptr->len; + + dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf), + skb_ptr->len, DMA_TO_DEVICE); + /* Free buffer */ + dev_kfree_skb(skb_ptr); + descptr->skb_ptr = NULL; + /* To next descriptor */ + descptr = descptr->vndescp; + priv->tx_free_desc++; + } + priv->tx_remove_ptr = descptr; + + if (priv->tx_free_desc) + netif_wake_queue(dev); + spin_unlock(&priv->lock); +} + +static int r6040_poll(struct napi_struct *napi, int budget) +{ + struct r6040_private *priv = + container_of(napi, struct r6040_private, napi); + struct net_device *dev = priv->dev; + void __iomem *ioaddr = priv->base; + int work_done; + + r6040_tx(dev); + + work_done = r6040_rx(dev, budget); + + if (work_done < budget) { + napi_complete_done(napi, work_done); + /* Enable RX/TX interrupt */ + iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS, + ioaddr + MIER); + } + return work_done; +} + +/* The RDC interrupt handler. */ +static irqreturn_t r6040_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + u16 misr, status; + + /* Save MIER */ + misr = ioread16(ioaddr + MIER); + /* Mask off RDC MAC interrupt */ + iowrite16(MSK_INT, ioaddr + MIER); + /* Read MISR status and clear */ + status = ioread16(ioaddr + MISR); + + if (status == 0x0000 || status == 0xffff) { + /* Restore RDC MAC interrupt */ + iowrite16(misr, ioaddr + MIER); + return IRQ_NONE; + } + + /* RX interrupt request */ + if (status & (RX_INTS | TX_INTS)) { + if (status & RX_NO_DESC) { + /* RX descriptor unavailable */ + dev->stats.rx_dropped++; + dev->stats.rx_missed_errors++; + } + if (status & RX_FIFO_FULL) + dev->stats.rx_fifo_errors++; + + if (likely(napi_schedule_prep(&lp->napi))) { + /* Mask off RX interrupt */ + misr &= ~(RX_INTS | TX_INTS); + __napi_schedule_irqoff(&lp->napi); + } + } + + /* Restore RDC MAC interrupt */ + iowrite16(misr, ioaddr + MIER); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +static void r6040_poll_controller(struct net_device *dev) +{ + disable_irq(dev->irq); + r6040_interrupt(dev->irq, dev); + enable_irq(dev->irq); +} +#endif + +/* Init RDC MAC */ +static int r6040_up(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + int ret; + + /* Initialise and alloc RX/TX buffers */ + r6040_init_txbufs(dev); + ret = r6040_alloc_rxbufs(dev); + if (ret) + return ret; + + /* improve performance (by RDC guys) */ + r6040_phy_write(ioaddr, 30, 17, + (r6040_phy_read(ioaddr, 30, 17) | 0x4000)); + r6040_phy_write(ioaddr, 30, 17, + ~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000)); + r6040_phy_write(ioaddr, 0, 19, 0x0000); + r6040_phy_write(ioaddr, 0, 30, 0x01F0); + + /* Initialize all MAC registers */ + r6040_init_mac_regs(dev); + + phy_start(dev->phydev); + + return 0; +} + + +/* Read/set MAC address routines */ +static void r6040_mac_address(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + const u16 *adrp; + + /* Reset MAC */ + r6040_reset_mac(lp); + + /* Restore MAC Address */ + adrp = (const u16 *) dev->dev_addr; + iowrite16(adrp[0], ioaddr + MID_0L); + iowrite16(adrp[1], ioaddr + MID_0M); + iowrite16(adrp[2], ioaddr + MID_0H); +} + +static int r6040_open(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + int ret; + + /* Request IRQ and Register interrupt handler */ + ret = request_irq(dev->irq, r6040_interrupt, + IRQF_SHARED, dev->name, dev); + if (ret) + goto out; + + /* Set MAC address */ + r6040_mac_address(dev); + + /* Allocate Descriptor memory */ + lp->rx_ring = + dma_alloc_coherent(&lp->pdev->dev, RX_DESC_SIZE, + &lp->rx_ring_dma, GFP_KERNEL); + if (!lp->rx_ring) { + ret = -ENOMEM; + goto err_free_irq; + } + + lp->tx_ring = + dma_alloc_coherent(&lp->pdev->dev, TX_DESC_SIZE, + &lp->tx_ring_dma, GFP_KERNEL); + if (!lp->tx_ring) { + ret = -ENOMEM; + goto err_free_rx_ring; + } + + ret = r6040_up(dev); + if (ret) + goto err_free_tx_ring; + + napi_enable(&lp->napi); + netif_start_queue(dev); + + return 0; + +err_free_tx_ring: + dma_free_coherent(&lp->pdev->dev, TX_DESC_SIZE, lp->tx_ring, + lp->tx_ring_dma); +err_free_rx_ring: + dma_free_coherent(&lp->pdev->dev, RX_DESC_SIZE, lp->rx_ring, + lp->rx_ring_dma); +err_free_irq: + free_irq(dev->irq, dev); +out: + return ret; +} + +static netdev_tx_t r6040_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + struct r6040_descriptor *descptr; + void __iomem *ioaddr = lp->base; + unsigned long flags; + + if (skb_put_padto(skb, ETH_ZLEN) < 0) + return NETDEV_TX_OK; + + /* Critical Section */ + spin_lock_irqsave(&lp->lock, flags); + + /* TX resource check */ + if (!lp->tx_free_desc) { + spin_unlock_irqrestore(&lp->lock, flags); + netif_stop_queue(dev); + netdev_err(dev, ": no tx descriptor\n"); + return NETDEV_TX_BUSY; + } + + /* Set TX descriptor & Transmit it */ + lp->tx_free_desc--; + descptr = lp->tx_insert_ptr; + descptr->len = skb->len; + descptr->skb_ptr = skb; + descptr->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, skb->data, + skb->len, DMA_TO_DEVICE)); + descptr->status = DSC_OWNER_MAC; + + skb_tx_timestamp(skb); + + /* Trigger the MAC to check the TX descriptor */ + if (!netdev_xmit_more() || netif_queue_stopped(dev)) + iowrite16(TM2TX, ioaddr + MTPR); + lp->tx_insert_ptr = descptr->vndescp; + + /* If no tx resource, stop */ + if (!lp->tx_free_desc) + netif_stop_queue(dev); + + spin_unlock_irqrestore(&lp->lock, flags); + + return NETDEV_TX_OK; +} + +static void r6040_multicast_list(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->base; + unsigned long flags; + struct netdev_hw_addr *ha; + int i; + const u16 *adrp; + u16 hash_table[4] = { 0 }; + + spin_lock_irqsave(&lp->lock, flags); + + /* Keep our MAC Address */ + adrp = (const u16 *)dev->dev_addr; + iowrite16(adrp[0], ioaddr + MID_0L); + iowrite16(adrp[1], ioaddr + MID_0M); + iowrite16(adrp[2], ioaddr + MID_0H); + + /* Clear AMCP & PROM bits */ + lp->mcr0 = ioread16(ioaddr + MCR0) & ~(MCR0_PROMISC | MCR0_HASH_EN); + + /* Promiscuous mode */ + if (dev->flags & IFF_PROMISC) + lp->mcr0 |= MCR0_PROMISC; + + /* Enable multicast hash table function to + * receive all multicast packets. */ + else if (dev->flags & IFF_ALLMULTI) { + lp->mcr0 |= MCR0_HASH_EN; + + for (i = 0; i < MCAST_MAX ; i++) { + iowrite16(0, ioaddr + MID_1L + 8 * i); + iowrite16(0, ioaddr + MID_1M + 8 * i); + iowrite16(0, ioaddr + MID_1H + 8 * i); + } + + for (i = 0; i < 4; i++) + hash_table[i] = 0xffff; + } + /* Use internal multicast address registers if the number of + * multicast addresses is not greater than MCAST_MAX. */ + else if (netdev_mc_count(dev) <= MCAST_MAX) { + i = 0; + netdev_for_each_mc_addr(ha, dev) { + u16 *adrp = (u16 *) ha->addr; + iowrite16(adrp[0], ioaddr + MID_1L + 8 * i); + iowrite16(adrp[1], ioaddr + MID_1M + 8 * i); + iowrite16(adrp[2], ioaddr + MID_1H + 8 * i); + i++; + } + while (i < MCAST_MAX) { + iowrite16(0, ioaddr + MID_1L + 8 * i); + iowrite16(0, ioaddr + MID_1M + 8 * i); + iowrite16(0, ioaddr + MID_1H + 8 * i); + i++; + } + } + /* Otherwise, Enable multicast hash table function. */ + else { + u32 crc; + + lp->mcr0 |= MCR0_HASH_EN; + + for (i = 0; i < MCAST_MAX ; i++) { + iowrite16(0, ioaddr + MID_1L + 8 * i); + iowrite16(0, ioaddr + MID_1M + 8 * i); + iowrite16(0, ioaddr + MID_1H + 8 * i); + } + + /* Build multicast hash table */ + netdev_for_each_mc_addr(ha, dev) { + u8 *addrs = ha->addr; + + crc = ether_crc(ETH_ALEN, addrs); + crc >>= 26; + hash_table[crc >> 4] |= 1 << (crc & 0xf); + } + } + + iowrite16(lp->mcr0, ioaddr + MCR0); + + /* Fill the MAC hash tables with their values */ + if (lp->mcr0 & MCR0_HASH_EN) { + iowrite16(hash_table[0], ioaddr + MAR0); + iowrite16(hash_table[1], ioaddr + MAR1); + iowrite16(hash_table[2], ioaddr + MAR2); + iowrite16(hash_table[3], ioaddr + MAR3); + } + + spin_unlock_irqrestore(&lp->lock, flags); +} + +static void netdev_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + struct r6040_private *rp = netdev_priv(dev); + + strscpy(info->driver, DRV_NAME, sizeof(info->driver)); + strscpy(info->version, DRV_VERSION, sizeof(info->version)); + strscpy(info->bus_info, pci_name(rp->pdev), sizeof(info->bus_info)); +} + +static const struct ethtool_ops netdev_ethtool_ops = { + .get_drvinfo = netdev_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_ts_info = ethtool_op_get_ts_info, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, + .nway_reset = phy_ethtool_nway_reset, +}; + +static const struct net_device_ops r6040_netdev_ops = { + .ndo_open = r6040_open, + .ndo_stop = r6040_close, + .ndo_start_xmit = r6040_start_xmit, + .ndo_get_stats = r6040_get_stats, + .ndo_set_rx_mode = r6040_multicast_list, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = eth_mac_addr, + .ndo_eth_ioctl = phy_do_ioctl, + .ndo_tx_timeout = r6040_tx_timeout, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = r6040_poll_controller, +#endif +}; + +static void r6040_adjust_link(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + struct phy_device *phydev = dev->phydev; + int status_changed = 0; + void __iomem *ioaddr = lp->base; + + BUG_ON(!phydev); + + if (lp->old_link != phydev->link) { + status_changed = 1; + lp->old_link = phydev->link; + } + + /* reflect duplex change */ + if (phydev->link && (lp->old_duplex != phydev->duplex)) { + lp->mcr0 |= (phydev->duplex == DUPLEX_FULL ? MCR0_FD : 0); + iowrite16(lp->mcr0, ioaddr); + + status_changed = 1; + lp->old_duplex = phydev->duplex; + } + + if (status_changed) + phy_print_status(phydev); +} + +static int r6040_mii_probe(struct net_device *dev) +{ + struct r6040_private *lp = netdev_priv(dev); + struct phy_device *phydev = NULL; + + phydev = phy_find_first(lp->mii_bus); + if (!phydev) { + dev_err(&lp->pdev->dev, "no PHY found\n"); + return -ENODEV; + } + + phydev = phy_connect(dev, phydev_name(phydev), &r6040_adjust_link, + PHY_INTERFACE_MODE_MII); + + if (IS_ERR(phydev)) { + dev_err(&lp->pdev->dev, "could not attach to PHY\n"); + return PTR_ERR(phydev); + } + + phy_set_max_speed(phydev, SPEED_100); + + lp->old_link = 0; + lp->old_duplex = -1; + + phy_attached_info(phydev); + + return 0; +} + +static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct net_device *dev; + struct r6040_private *lp; + void __iomem *ioaddr; + int err, io_size = R6040_IO_SIZE; + static int card_idx = -1; + u16 addr[ETH_ALEN / 2]; + int bar = 0; + + pr_info("%s\n", version); + + err = pci_enable_device(pdev); + if (err) + goto err_out; + + /* this should always be supported */ + err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); + if (err) { + dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n"); + goto err_out_disable_dev; + } + err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); + if (err) { + dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n"); + goto err_out_disable_dev; + } + + /* IO Size check */ + if (pci_resource_len(pdev, bar) < io_size) { + dev_err(&pdev->dev, "Insufficient PCI resources, aborting\n"); + err = -EIO; + goto err_out_disable_dev; + } + + pci_set_master(pdev); + + dev = alloc_etherdev(sizeof(struct r6040_private)); + if (!dev) { + err = -ENOMEM; + goto err_out_disable_dev; + } + SET_NETDEV_DEV(dev, &pdev->dev); + lp = netdev_priv(dev); + + err = pci_request_regions(pdev, DRV_NAME); + + if (err) { + dev_err(&pdev->dev, "Failed to request PCI regions\n"); + goto err_out_free_dev; + } + + ioaddr = pci_iomap(pdev, bar, io_size); + if (!ioaddr) { + dev_err(&pdev->dev, "ioremap failed for device\n"); + err = -EIO; + goto err_out_free_res; + } + + /* If PHY status change register is still set to zero it means the + * bootloader didn't initialize it, so we set it to: + * - enable phy status change + * - enable all phy addresses + * - set to lowest timer divider */ + if (ioread16(ioaddr + PHY_CC) == 0) + iowrite16(SCEN | PHY_MAX_ADDR << PHYAD_SHIFT | + 7 << TMRDIV_SHIFT, ioaddr + PHY_CC); + + /* Init system & device */ + lp->base = ioaddr; + dev->irq = pdev->irq; + + spin_lock_init(&lp->lock); + pci_set_drvdata(pdev, dev); + + /* Set MAC address */ + card_idx++; + + addr[0] = ioread16(ioaddr + MID_0L); + addr[1] = ioread16(ioaddr + MID_0M); + addr[2] = ioread16(ioaddr + MID_0H); + eth_hw_addr_set(dev, (u8 *)addr); + + /* Some bootloader/BIOSes do not initialize + * MAC address, warn about that */ + if (!(addr[0] || addr[1] || addr[2])) { + netdev_warn(dev, "MAC address not initialized, " + "generating random\n"); + eth_hw_addr_random(dev); + } + + /* Link new device into r6040_root_dev */ + lp->pdev = pdev; + lp->dev = dev; + + /* Init RDC private data */ + lp->mcr0 = MCR0_XMTEN | MCR0_RCVEN; + + /* The RDC-specific entries in the device structure. */ + dev->netdev_ops = &r6040_netdev_ops; + dev->ethtool_ops = &netdev_ethtool_ops; + dev->watchdog_timeo = TX_TIMEOUT; + + netif_napi_add(dev, &lp->napi, r6040_poll); + + lp->mii_bus = mdiobus_alloc(); + if (!lp->mii_bus) { + dev_err(&pdev->dev, "mdiobus_alloc() failed\n"); + err = -ENOMEM; + goto err_out_unmap; + } + + lp->mii_bus->priv = dev; + lp->mii_bus->read = r6040_mdiobus_read; + lp->mii_bus->write = r6040_mdiobus_write; + lp->mii_bus->name = "r6040_eth_mii"; + snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", + dev_name(&pdev->dev), card_idx); + + err = mdiobus_register(lp->mii_bus); + if (err) { + dev_err(&pdev->dev, "failed to register MII bus\n"); + goto err_out_mdio; + } + + err = r6040_mii_probe(dev); + if (err) { + dev_err(&pdev->dev, "failed to probe MII bus\n"); + goto err_out_mdio_unregister; + } + + /* Register net device. After this dev->name assign */ + err = register_netdev(dev); + if (err) { + dev_err(&pdev->dev, "Failed to register net device\n"); + goto err_out_phy_disconnect; + } + return 0; + +err_out_phy_disconnect: + phy_disconnect(dev->phydev); +err_out_mdio_unregister: + mdiobus_unregister(lp->mii_bus); +err_out_mdio: + mdiobus_free(lp->mii_bus); +err_out_unmap: + netif_napi_del(&lp->napi); + pci_iounmap(pdev, ioaddr); +err_out_free_res: + pci_release_regions(pdev); +err_out_free_dev: + free_netdev(dev); +err_out_disable_dev: + pci_disable_device(pdev); +err_out: + return err; +} + +static void r6040_remove_one(struct pci_dev *pdev) +{ + struct net_device *dev = pci_get_drvdata(pdev); + struct r6040_private *lp = netdev_priv(dev); + + unregister_netdev(dev); + phy_disconnect(dev->phydev); + mdiobus_unregister(lp->mii_bus); + mdiobus_free(lp->mii_bus); + netif_napi_del(&lp->napi); + pci_iounmap(pdev, lp->base); + pci_release_regions(pdev); + free_netdev(dev); + pci_disable_device(pdev); +} + + +static const struct pci_device_id r6040_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) }, + { 0 } +}; +MODULE_DEVICE_TABLE(pci, r6040_pci_tbl); + +static struct pci_driver r6040_driver = { + .name = DRV_NAME, + .id_table = r6040_pci_tbl, + .probe = r6040_init_one, + .remove = r6040_remove_one, +}; + +module_pci_driver(r6040_driver); |