diff options
Diffstat (limited to 'drivers/net/ethernet/microchip/encx24j600.c')
| -rw-r--r-- | drivers/net/ethernet/microchip/encx24j600.c | 1152 |
1 files changed, 1152 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/encx24j600.c b/drivers/net/ethernet/microchip/encx24j600.c new file mode 100644 index 000000000..ff45326eb --- /dev/null +++ b/drivers/net/ethernet/microchip/encx24j600.c @@ -0,0 +1,1152 @@ +/** + * Microchip ENCX24J600 ethernet driver + * + * Copyright (C) 2015 Gridpoint + * Author: Jon Ringle <jringle@gridpoint.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/regmap.h> +#include <linux/skbuff.h> +#include <linux/spi/spi.h> + +#include "encx24j600_hw.h" + +#define DRV_NAME "encx24j600" +#define DRV_VERSION "1.0" + +#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK) +static int debug = -1; +module_param(debug, int, 0000); +MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); + +/* SRAM memory layout: + * + * 0x0000-0x05ff TX buffers 1.5KB (1*1536) reside in the GP area in SRAM + * 0x0600-0x5fff RX buffers 22.5KB (15*1536) reside in the RX area in SRAM + */ +#define ENC_TX_BUF_START 0x0000U +#define ENC_RX_BUF_START 0x0600U +#define ENC_RX_BUF_END 0x5fffU +#define ENC_SRAM_SIZE 0x6000U + +enum { + RXFILTER_NORMAL, + RXFILTER_MULTI, + RXFILTER_PROMISC +}; + +struct encx24j600_priv { + struct net_device *ndev; + struct mutex lock; /* device access lock */ + struct encx24j600_context ctx; + struct sk_buff *tx_skb; + struct task_struct *kworker_task; + struct kthread_worker kworker; + struct kthread_work tx_work; + struct kthread_work setrx_work; + u16 next_packet; + bool hw_enabled; + bool full_duplex; + bool autoneg; + u16 speed; + int rxfilter; + u32 msg_enable; +}; + +static void dump_packet(const char *msg, int len, const char *data) +{ + pr_debug(DRV_NAME ": %s - packet len:%d\n", msg, len); + print_hex_dump_bytes("pk data: ", DUMP_PREFIX_OFFSET, data, len); +} + +static void encx24j600_dump_rsv(struct encx24j600_priv *priv, const char *msg, + struct rsv *rsv) +{ + struct net_device *dev = priv->ndev; + + netdev_info(dev, "RX packet Len:%d\n", rsv->len); + netdev_dbg(dev, "%s - NextPk: 0x%04x\n", msg, + rsv->next_packet); + netdev_dbg(dev, "RxOK: %d, DribbleNibble: %d\n", + RSV_GETBIT(rsv->rxstat, RSV_RXOK), + RSV_GETBIT(rsv->rxstat, RSV_DRIBBLENIBBLE)); + netdev_dbg(dev, "CRCErr:%d, LenChkErr: %d, LenOutOfRange: %d\n", + RSV_GETBIT(rsv->rxstat, RSV_CRCERROR), + RSV_GETBIT(rsv->rxstat, RSV_LENCHECKERR), + RSV_GETBIT(rsv->rxstat, RSV_LENOUTOFRANGE)); + netdev_dbg(dev, "Multicast: %d, Broadcast: %d, LongDropEvent: %d, CarrierEvent: %d\n", + RSV_GETBIT(rsv->rxstat, RSV_RXMULTICAST), + RSV_GETBIT(rsv->rxstat, RSV_RXBROADCAST), + RSV_GETBIT(rsv->rxstat, RSV_RXLONGEVDROPEV), + RSV_GETBIT(rsv->rxstat, RSV_CARRIEREV)); + netdev_dbg(dev, "ControlFrame: %d, PauseFrame: %d, UnknownOp: %d, VLanTagFrame: %d\n", + RSV_GETBIT(rsv->rxstat, RSV_RXCONTROLFRAME), + RSV_GETBIT(rsv->rxstat, RSV_RXPAUSEFRAME), + RSV_GETBIT(rsv->rxstat, RSV_RXUNKNOWNOPCODE), + RSV_GETBIT(rsv->rxstat, RSV_RXTYPEVLAN)); +} + +static u16 encx24j600_read_reg(struct encx24j600_priv *priv, u8 reg) +{ + struct net_device *dev = priv->ndev; + unsigned int val = 0; + int ret = regmap_read(priv->ctx.regmap, reg, &val); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d reading reg %02x\n", + __func__, ret, reg); + return val; +} + +static void encx24j600_write_reg(struct encx24j600_priv *priv, u8 reg, u16 val) +{ + struct net_device *dev = priv->ndev; + int ret = regmap_write(priv->ctx.regmap, reg, val); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d writing reg %02x=%04x\n", + __func__, ret, reg, val); +} + +static void encx24j600_update_reg(struct encx24j600_priv *priv, u8 reg, + u16 mask, u16 val) +{ + struct net_device *dev = priv->ndev; + int ret = regmap_update_bits(priv->ctx.regmap, reg, mask, val); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d updating reg %02x=%04x~%04x\n", + __func__, ret, reg, val, mask); +} + +static u16 encx24j600_read_phy(struct encx24j600_priv *priv, u8 reg) +{ + struct net_device *dev = priv->ndev; + unsigned int val = 0; + int ret = regmap_read(priv->ctx.phymap, reg, &val); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d reading %02x\n", + __func__, ret, reg); + return val; +} + +static void encx24j600_write_phy(struct encx24j600_priv *priv, u8 reg, u16 val) +{ + struct net_device *dev = priv->ndev; + int ret = regmap_write(priv->ctx.phymap, reg, val); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d writing reg %02x=%04x\n", + __func__, ret, reg, val); +} + +static void encx24j600_clr_bits(struct encx24j600_priv *priv, u8 reg, u16 mask) +{ + encx24j600_update_reg(priv, reg, mask, 0); +} + +static void encx24j600_set_bits(struct encx24j600_priv *priv, u8 reg, u16 mask) +{ + encx24j600_update_reg(priv, reg, mask, mask); +} + +static void encx24j600_cmd(struct encx24j600_priv *priv, u8 cmd) +{ + struct net_device *dev = priv->ndev; + int ret = regmap_write(priv->ctx.regmap, cmd, 0); + + if (unlikely(ret)) + netif_err(priv, drv, dev, "%s: error %d with cmd %02x\n", + __func__, ret, cmd); +} + +static int encx24j600_raw_read(struct encx24j600_priv *priv, u8 reg, u8 *data, + size_t count) +{ + int ret; + + mutex_lock(&priv->ctx.mutex); + ret = regmap_encx24j600_spi_read(&priv->ctx, reg, data, count); + mutex_unlock(&priv->ctx.mutex); + + return ret; +} + +static int encx24j600_raw_write(struct encx24j600_priv *priv, u8 reg, + const u8 *data, size_t count) +{ + int ret; + + mutex_lock(&priv->ctx.mutex); + ret = regmap_encx24j600_spi_write(&priv->ctx, reg, data, count); + mutex_unlock(&priv->ctx.mutex); + + return ret; +} + +static void encx24j600_update_phcon1(struct encx24j600_priv *priv) +{ + u16 phcon1 = encx24j600_read_phy(priv, PHCON1); + + if (priv->autoneg == AUTONEG_ENABLE) { + phcon1 |= ANEN | RENEG; + } else { + phcon1 &= ~ANEN; + if (priv->speed == SPEED_100) + phcon1 |= SPD100; + else + phcon1 &= ~SPD100; + + if (priv->full_duplex) + phcon1 |= PFULDPX; + else + phcon1 &= ~PFULDPX; + } + encx24j600_write_phy(priv, PHCON1, phcon1); +} + +/* Waits for autonegotiation to complete. */ +static int encx24j600_wait_for_autoneg(struct encx24j600_priv *priv) +{ + struct net_device *dev = priv->ndev; + unsigned long timeout = jiffies + msecs_to_jiffies(2000); + u16 phstat1; + u16 estat; + int ret = 0; + + phstat1 = encx24j600_read_phy(priv, PHSTAT1); + while ((phstat1 & ANDONE) == 0) { + if (time_after(jiffies, timeout)) { + u16 phstat3; + + netif_notice(priv, drv, dev, "timeout waiting for autoneg done\n"); + + priv->autoneg = AUTONEG_DISABLE; + phstat3 = encx24j600_read_phy(priv, PHSTAT3); + priv->speed = (phstat3 & PHY3SPD100) + ? SPEED_100 : SPEED_10; + priv->full_duplex = (phstat3 & PHY3DPX) ? 1 : 0; + encx24j600_update_phcon1(priv); + netif_notice(priv, drv, dev, "Using parallel detection: %s/%s", + priv->speed == SPEED_100 ? "100" : "10", + priv->full_duplex ? "Full" : "Half"); + + return -ETIMEDOUT; + } + cpu_relax(); + phstat1 = encx24j600_read_phy(priv, PHSTAT1); + } + + estat = encx24j600_read_reg(priv, ESTAT); + if (estat & PHYDPX) { + encx24j600_set_bits(priv, MACON2, FULDPX); + encx24j600_write_reg(priv, MABBIPG, 0x15); + } else { + encx24j600_clr_bits(priv, MACON2, FULDPX); + encx24j600_write_reg(priv, MABBIPG, 0x12); + /* Max retransmittions attempt */ + encx24j600_write_reg(priv, MACLCON, 0x370f); + } + + return ret; +} + +/* Access the PHY to determine link status */ +static void encx24j600_check_link_status(struct encx24j600_priv *priv) +{ + struct net_device *dev = priv->ndev; + u16 estat; + + estat = encx24j600_read_reg(priv, ESTAT); + + if (estat & PHYLNK) { + if (priv->autoneg == AUTONEG_ENABLE) + encx24j600_wait_for_autoneg(priv); + + netif_carrier_on(dev); + netif_info(priv, ifup, dev, "link up\n"); + } else { + netif_info(priv, ifdown, dev, "link down\n"); + + /* Re-enable autoneg since we won't know what we might be + * connected to when the link is brought back up again. + */ + priv->autoneg = AUTONEG_ENABLE; + priv->full_duplex = true; + priv->speed = SPEED_100; + netif_carrier_off(dev); + } +} + +static void encx24j600_int_link_handler(struct encx24j600_priv *priv) +{ + struct net_device *dev = priv->ndev; + + netif_dbg(priv, intr, dev, "%s", __func__); + encx24j600_check_link_status(priv); + encx24j600_clr_bits(priv, EIR, LINKIF); +} + +static void encx24j600_tx_complete(struct encx24j600_priv *priv, bool err) +{ + struct net_device *dev = priv->ndev; + + if (!priv->tx_skb) { + BUG(); + return; + } + + mutex_lock(&priv->lock); + + if (err) + dev->stats.tx_errors++; + else + dev->stats.tx_packets++; + + dev->stats.tx_bytes += priv->tx_skb->len; + + encx24j600_clr_bits(priv, EIR, TXIF | TXABTIF); + + netif_dbg(priv, tx_done, dev, "TX Done%s\n", err ? ": Err" : ""); + + dev_kfree_skb(priv->tx_skb); + priv->tx_skb = NULL; + + netif_wake_queue(dev); + + mutex_unlock(&priv->lock); +} + +static int encx24j600_receive_packet(struct encx24j600_priv *priv, + struct rsv *rsv) +{ + struct net_device *dev = priv->ndev; + struct sk_buff *skb = netdev_alloc_skb(dev, rsv->len + NET_IP_ALIGN); + + if (!skb) { + pr_err_ratelimited("RX: OOM: packet dropped\n"); + dev->stats.rx_dropped++; + return -ENOMEM; + } + skb_reserve(skb, NET_IP_ALIGN); + encx24j600_raw_read(priv, RRXDATA, skb_put(skb, rsv->len), rsv->len); + + if (netif_msg_pktdata(priv)) + dump_packet("RX", skb->len, skb->data); + + skb->dev = dev; + skb->protocol = eth_type_trans(skb, dev); + skb->ip_summed = CHECKSUM_COMPLETE; + + /* Maintain stats */ + dev->stats.rx_packets++; + dev->stats.rx_bytes += rsv->len; + + netif_rx(skb); + + return 0; +} + +static void encx24j600_rx_packets(struct encx24j600_priv *priv, u8 packet_count) +{ + struct net_device *dev = priv->ndev; + + while (packet_count--) { + struct rsv rsv; + u16 newrxtail; + + encx24j600_write_reg(priv, ERXRDPT, priv->next_packet); + encx24j600_raw_read(priv, RRXDATA, (u8 *)&rsv, sizeof(rsv)); + + if (netif_msg_rx_status(priv)) + encx24j600_dump_rsv(priv, __func__, &rsv); + + if (!RSV_GETBIT(rsv.rxstat, RSV_RXOK) || + (rsv.len > MAX_FRAMELEN)) { + netif_err(priv, rx_err, dev, "RX Error %04x\n", + rsv.rxstat); + dev->stats.rx_errors++; + + if (RSV_GETBIT(rsv.rxstat, RSV_CRCERROR)) + dev->stats.rx_crc_errors++; + if (RSV_GETBIT(rsv.rxstat, RSV_LENCHECKERR)) + dev->stats.rx_frame_errors++; + if (rsv.len > MAX_FRAMELEN) + dev->stats.rx_over_errors++; + } else { + encx24j600_receive_packet(priv, &rsv); + } + + priv->next_packet = rsv.next_packet; + + newrxtail = priv->next_packet - 2; + if (newrxtail == ENC_RX_BUF_START) + newrxtail = SRAM_SIZE - 2; + + encx24j600_cmd(priv, SETPKTDEC); + encx24j600_write_reg(priv, ERXTAIL, newrxtail); + } +} + +static irqreturn_t encx24j600_isr(int irq, void *dev_id) +{ + struct encx24j600_priv *priv = dev_id; + struct net_device *dev = priv->ndev; + int eir; + + /* Clear interrupts */ + encx24j600_cmd(priv, CLREIE); + + eir = encx24j600_read_reg(priv, EIR); + + if (eir & LINKIF) + encx24j600_int_link_handler(priv); + + if (eir & TXIF) + encx24j600_tx_complete(priv, false); + + if (eir & TXABTIF) + encx24j600_tx_complete(priv, true); + + if (eir & RXABTIF) { + if (eir & PCFULIF) { + /* Packet counter is full */ + netif_err(priv, rx_err, dev, "Packet counter full\n"); + } + dev->stats.rx_dropped++; + encx24j600_clr_bits(priv, EIR, RXABTIF); + } + + if (eir & PKTIF) { + u8 packet_count; + + mutex_lock(&priv->lock); + + packet_count = encx24j600_read_reg(priv, ESTAT) & 0xff; + while (packet_count) { + encx24j600_rx_packets(priv, packet_count); + packet_count = encx24j600_read_reg(priv, ESTAT) & 0xff; + } + + mutex_unlock(&priv->lock); + } + + /* Enable interrupts */ + encx24j600_cmd(priv, SETEIE); + + return IRQ_HANDLED; +} + +static int encx24j600_soft_reset(struct encx24j600_priv *priv) +{ + int ret = 0; + int timeout; + u16 eudast; + + /* Write and verify a test value to EUDAST */ + regcache_cache_bypass(priv->ctx.regmap, true); + timeout = 10; + do { + encx24j600_write_reg(priv, EUDAST, EUDAST_TEST_VAL); + eudast = encx24j600_read_reg(priv, EUDAST); + usleep_range(25, 100); + } while ((eudast != EUDAST_TEST_VAL) && --timeout); + regcache_cache_bypass(priv->ctx.regmap, false); + + if (timeout == 0) { + ret = -ETIMEDOUT; + goto err_out; + } + + /* Wait for CLKRDY to become set */ + timeout = 10; + while (!(encx24j600_read_reg(priv, ESTAT) & CLKRDY) && --timeout) + usleep_range(25, 100); + + if (timeout == 0) { + ret = -ETIMEDOUT; + goto err_out; + } + + /* Issue a System Reset command */ + encx24j600_cmd(priv, SETETHRST); + usleep_range(25, 100); + + /* Confirm that EUDAST has 0000h after system reset */ + if (encx24j600_read_reg(priv, EUDAST) != 0) { + ret = -EINVAL; + goto err_out; + } + + /* Wait for PHY register and status bits to become available */ + usleep_range(256, 1000); + +err_out: + return ret; +} + +static int encx24j600_hw_reset(struct encx24j600_priv *priv) +{ + int ret; + + mutex_lock(&priv->lock); + ret = encx24j600_soft_reset(priv); + mutex_unlock(&priv->lock); + + return ret; +} + +static void encx24j600_reset_hw_tx(struct encx24j600_priv *priv) +{ + encx24j600_set_bits(priv, ECON2, TXRST); + encx24j600_clr_bits(priv, ECON2, TXRST); +} + +static void encx24j600_hw_init_tx(struct encx24j600_priv *priv) +{ + /* Reset TX */ + encx24j600_reset_hw_tx(priv); + + /* Clear the TXIF flag if were previously set */ + encx24j600_clr_bits(priv, EIR, TXIF | TXABTIF); + + /* Write the Tx Buffer pointer */ + encx24j600_write_reg(priv, EGPWRPT, ENC_TX_BUF_START); +} + +static void encx24j600_hw_init_rx(struct encx24j600_priv *priv) +{ + encx24j600_cmd(priv, DISABLERX); + + /* Set up RX packet start address in the SRAM */ + encx24j600_write_reg(priv, ERXST, ENC_RX_BUF_START); + + /* Preload the RX Data pointer to the beginning of the RX area */ + encx24j600_write_reg(priv, ERXRDPT, ENC_RX_BUF_START); + + priv->next_packet = ENC_RX_BUF_START; + + /* Set up RX end address in the SRAM */ + encx24j600_write_reg(priv, ERXTAIL, ENC_SRAM_SIZE - 2); + + /* Reset the user data pointers */ + encx24j600_write_reg(priv, EUDAST, ENC_SRAM_SIZE); + encx24j600_write_reg(priv, EUDAND, ENC_SRAM_SIZE + 1); + + /* Set Max Frame length */ + encx24j600_write_reg(priv, MAMXFL, MAX_FRAMELEN); +} + +static void encx24j600_dump_config(struct encx24j600_priv *priv, + const char *msg) +{ + pr_info(DRV_NAME ": %s\n", msg); + + /* CHIP configuration */ + pr_info(DRV_NAME " ECON1: %04X\n", encx24j600_read_reg(priv, ECON1)); + pr_info(DRV_NAME " ECON2: %04X\n", encx24j600_read_reg(priv, ECON2)); + pr_info(DRV_NAME " ERXFCON: %04X\n", encx24j600_read_reg(priv, + ERXFCON)); + pr_info(DRV_NAME " ESTAT: %04X\n", encx24j600_read_reg(priv, ESTAT)); + pr_info(DRV_NAME " EIR: %04X\n", encx24j600_read_reg(priv, EIR)); + pr_info(DRV_NAME " EIDLED: %04X\n", encx24j600_read_reg(priv, EIDLED)); + + /* MAC layer configuration */ + pr_info(DRV_NAME " MACON1: %04X\n", encx24j600_read_reg(priv, MACON1)); + pr_info(DRV_NAME " MACON2: %04X\n", encx24j600_read_reg(priv, MACON2)); + pr_info(DRV_NAME " MAIPG: %04X\n", encx24j600_read_reg(priv, MAIPG)); + pr_info(DRV_NAME " MACLCON: %04X\n", encx24j600_read_reg(priv, + MACLCON)); + pr_info(DRV_NAME " MABBIPG: %04X\n", encx24j600_read_reg(priv, + MABBIPG)); + + /* PHY configuation */ + pr_info(DRV_NAME " PHCON1: %04X\n", encx24j600_read_phy(priv, PHCON1)); + pr_info(DRV_NAME " PHCON2: %04X\n", encx24j600_read_phy(priv, PHCON2)); + pr_info(DRV_NAME " PHANA: %04X\n", encx24j600_read_phy(priv, PHANA)); + pr_info(DRV_NAME " PHANLPA: %04X\n", encx24j600_read_phy(priv, + PHANLPA)); + pr_info(DRV_NAME " PHANE: %04X\n", encx24j600_read_phy(priv, PHANE)); + pr_info(DRV_NAME " PHSTAT1: %04X\n", encx24j600_read_phy(priv, + PHSTAT1)); + pr_info(DRV_NAME " PHSTAT2: %04X\n", encx24j600_read_phy(priv, + PHSTAT2)); + pr_info(DRV_NAME " PHSTAT3: %04X\n", encx24j600_read_phy(priv, + PHSTAT3)); +} + +static void encx24j600_set_rxfilter_mode(struct encx24j600_priv *priv) +{ + switch (priv->rxfilter) { + case RXFILTER_PROMISC: + encx24j600_set_bits(priv, MACON1, PASSALL); + encx24j600_write_reg(priv, ERXFCON, UCEN | MCEN | NOTMEEN); + break; + case RXFILTER_MULTI: + encx24j600_clr_bits(priv, MACON1, PASSALL); + encx24j600_write_reg(priv, ERXFCON, UCEN | CRCEN | BCEN | MCEN); + break; + case RXFILTER_NORMAL: + default: + encx24j600_clr_bits(priv, MACON1, PASSALL); + encx24j600_write_reg(priv, ERXFCON, UCEN | CRCEN | BCEN); + break; + } +} + +static int encx24j600_hw_init(struct encx24j600_priv *priv) +{ + int ret = 0; + u16 macon2; + + priv->hw_enabled = false; + + /* PHY Leds: link status, + * LEDA: Link State + collision events + * LEDB: Link State + transmit/receive events + */ + encx24j600_update_reg(priv, EIDLED, 0xff00, 0xcb00); + + /* Loopback disabled */ + encx24j600_write_reg(priv, MACON1, 0x9); + + /* interpacket gap value */ + encx24j600_write_reg(priv, MAIPG, 0x0c12); + + /* Write the auto negotiation pattern */ + encx24j600_write_phy(priv, PHANA, PHANA_DEFAULT); + + encx24j600_update_phcon1(priv); + encx24j600_check_link_status(priv); + + macon2 = MACON2_RSV1 | TXCRCEN | PADCFG0 | PADCFG2 | MACON2_DEFER; + if ((priv->autoneg == AUTONEG_DISABLE) && priv->full_duplex) + macon2 |= FULDPX; + + encx24j600_set_bits(priv, MACON2, macon2); + + priv->rxfilter = RXFILTER_NORMAL; + encx24j600_set_rxfilter_mode(priv); + + /* Program the Maximum frame length */ + encx24j600_write_reg(priv, MAMXFL, MAX_FRAMELEN); + + /* Init Tx pointers */ + encx24j600_hw_init_tx(priv); + + /* Init Rx pointers */ + encx24j600_hw_init_rx(priv); + + if (netif_msg_hw(priv)) + encx24j600_dump_config(priv, "Hw is initialized"); + + return ret; +} + +static void encx24j600_hw_enable(struct encx24j600_priv *priv) +{ + /* Clear the interrupt flags in case was set */ + encx24j600_clr_bits(priv, EIR, (PCFULIF | RXABTIF | TXABTIF | TXIF | + PKTIF | LINKIF)); + + /* Enable the interrupts */ + encx24j600_write_reg(priv, EIE, (PCFULIE | RXABTIE | TXABTIE | TXIE | + PKTIE | LINKIE | INTIE)); + + /* Enable RX */ + encx24j600_cmd(priv, ENABLERX); + + priv->hw_enabled = true; +} + +static void encx24j600_hw_disable(struct encx24j600_priv *priv) +{ + /* Disable all interrupts */ + encx24j600_write_reg(priv, EIE, 0); + + /* Disable RX */ + encx24j600_cmd(priv, DISABLERX); + + priv->hw_enabled = false; +} + +static int encx24j600_setlink(struct net_device *dev, u8 autoneg, u16 speed, + u8 duplex) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + int ret = 0; + + if (!priv->hw_enabled) { + /* link is in low power mode now; duplex setting + * will take effect on next encx24j600_hw_init() + */ + if (speed == SPEED_10 || speed == SPEED_100) { + priv->autoneg = (autoneg == AUTONEG_ENABLE); + priv->full_duplex = (duplex == DUPLEX_FULL); + priv->speed = (speed == SPEED_100); + } else { + netif_warn(priv, link, dev, "unsupported link speed setting\n"); + /*speeds other than SPEED_10 and SPEED_100 */ + /*are not supported by chip */ + ret = -EOPNOTSUPP; + } + } else { + netif_warn(priv, link, dev, "Warning: hw must be disabled to set link mode\n"); + ret = -EBUSY; + } + return ret; +} + +static void encx24j600_hw_get_macaddr(struct encx24j600_priv *priv, + unsigned char *ethaddr) +{ + unsigned short val; + + val = encx24j600_read_reg(priv, MAADR1); + + ethaddr[0] = val & 0x00ff; + ethaddr[1] = (val & 0xff00) >> 8; + + val = encx24j600_read_reg(priv, MAADR2); + + ethaddr[2] = val & 0x00ffU; + ethaddr[3] = (val & 0xff00U) >> 8; + + val = encx24j600_read_reg(priv, MAADR3); + + ethaddr[4] = val & 0x00ffU; + ethaddr[5] = (val & 0xff00U) >> 8; +} + +/* Program the hardware MAC address from dev->dev_addr.*/ +static int encx24j600_set_hw_macaddr(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + if (priv->hw_enabled) { + netif_info(priv, drv, dev, "Hardware must be disabled to set Mac address\n"); + return -EBUSY; + } + + mutex_lock(&priv->lock); + + netif_info(priv, drv, dev, "%s: Setting MAC address to %pM\n", + dev->name, dev->dev_addr); + + encx24j600_write_reg(priv, MAADR3, (dev->dev_addr[4] | + dev->dev_addr[5] << 8)); + encx24j600_write_reg(priv, MAADR2, (dev->dev_addr[2] | + dev->dev_addr[3] << 8)); + encx24j600_write_reg(priv, MAADR1, (dev->dev_addr[0] | + dev->dev_addr[1] << 8)); + + mutex_unlock(&priv->lock); + + return 0; +} + +/* Store the new hardware address in dev->dev_addr, and update the MAC.*/ +static int encx24j600_set_mac_address(struct net_device *dev, void *addr) +{ + struct sockaddr *address = addr; + + if (netif_running(dev)) + return -EBUSY; + if (!is_valid_ether_addr(address->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(dev->dev_addr, address->sa_data, dev->addr_len); + return encx24j600_set_hw_macaddr(dev); +} + +static int encx24j600_open(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + int ret = request_threaded_irq(priv->ctx.spi->irq, NULL, encx24j600_isr, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + DRV_NAME, priv); + if (unlikely(ret < 0)) { + netdev_err(dev, "request irq %d failed (ret = %d)\n", + priv->ctx.spi->irq, ret); + return ret; + } + + encx24j600_hw_disable(priv); + encx24j600_hw_init(priv); + encx24j600_hw_enable(priv); + netif_start_queue(dev); + + return 0; +} + +static int encx24j600_stop(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + netif_stop_queue(dev); + free_irq(priv->ctx.spi->irq, priv); + return 0; +} + +static void encx24j600_setrx_proc(struct kthread_work *ws) +{ + struct encx24j600_priv *priv = + container_of(ws, struct encx24j600_priv, setrx_work); + + mutex_lock(&priv->lock); + encx24j600_set_rxfilter_mode(priv); + mutex_unlock(&priv->lock); +} + +static void encx24j600_set_multicast_list(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + int oldfilter = priv->rxfilter; + + if (dev->flags & IFF_PROMISC) { + netif_dbg(priv, link, dev, "promiscuous mode\n"); + priv->rxfilter = RXFILTER_PROMISC; + } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) { + netif_dbg(priv, link, dev, "%smulticast mode\n", + (dev->flags & IFF_ALLMULTI) ? "all-" : ""); + priv->rxfilter = RXFILTER_MULTI; + } else { + netif_dbg(priv, link, dev, "normal mode\n"); + priv->rxfilter = RXFILTER_NORMAL; + } + + if (oldfilter != priv->rxfilter) + kthread_queue_work(&priv->kworker, &priv->setrx_work); +} + +static void encx24j600_hw_tx(struct encx24j600_priv *priv) +{ + struct net_device *dev = priv->ndev; + + netif_info(priv, tx_queued, dev, "TX Packet Len:%d\n", + priv->tx_skb->len); + + if (netif_msg_pktdata(priv)) + dump_packet("TX", priv->tx_skb->len, priv->tx_skb->data); + + if (encx24j600_read_reg(priv, EIR) & TXABTIF) + /* Last transmition aborted due to error. Reset TX interface */ + encx24j600_reset_hw_tx(priv); + + /* Clear the TXIF flag if were previously set */ + encx24j600_clr_bits(priv, EIR, TXIF); + + /* Set the data pointer to the TX buffer address in the SRAM */ + encx24j600_write_reg(priv, EGPWRPT, ENC_TX_BUF_START); + + /* Copy the packet into the SRAM */ + encx24j600_raw_write(priv, WGPDATA, (u8 *)priv->tx_skb->data, + priv->tx_skb->len); + + /* Program the Tx buffer start pointer */ + encx24j600_write_reg(priv, ETXST, ENC_TX_BUF_START); + + /* Program the packet length */ + encx24j600_write_reg(priv, ETXLEN, priv->tx_skb->len); + + /* Start the transmission */ + encx24j600_cmd(priv, SETTXRTS); +} + +static void encx24j600_tx_proc(struct kthread_work *ws) +{ + struct encx24j600_priv *priv = + container_of(ws, struct encx24j600_priv, tx_work); + + mutex_lock(&priv->lock); + encx24j600_hw_tx(priv); + mutex_unlock(&priv->lock); +} + +static netdev_tx_t encx24j600_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + netif_stop_queue(dev); + + /* save the timestamp */ + netif_trans_update(dev); + + /* Remember the skb for deferred processing */ + priv->tx_skb = skb; + + kthread_queue_work(&priv->kworker, &priv->tx_work); + + return NETDEV_TX_OK; +} + +/* Deal with a transmit timeout */ +static void encx24j600_tx_timeout(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + netif_err(priv, tx_err, dev, "TX timeout at %ld, latency %ld\n", + jiffies, jiffies - dev_trans_start(dev)); + + dev->stats.tx_errors++; + netif_wake_queue(dev); +} + +static int encx24j600_get_regs_len(struct net_device *dev) +{ + return SFR_REG_COUNT; +} + +static void encx24j600_get_regs(struct net_device *dev, + struct ethtool_regs *regs, void *p) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + u16 *buff = p; + u8 reg; + + regs->version = 1; + mutex_lock(&priv->lock); + for (reg = 0; reg < SFR_REG_COUNT; reg += 2) { + unsigned int val = 0; + /* ignore errors for unreadable registers */ + regmap_read(priv->ctx.regmap, reg, &val); + buff[reg] = val & 0xffff; + } + mutex_unlock(&priv->lock); +} + +static void encx24j600_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); + strlcpy(info->version, DRV_VERSION, sizeof(info->version)); + strlcpy(info->bus_info, dev_name(dev->dev.parent), + sizeof(info->bus_info)); +} + +static int encx24j600_get_link_ksettings(struct net_device *dev, + struct ethtool_link_ksettings *cmd) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + u32 supported; + + supported = SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg | SUPPORTED_TP; + + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported, + supported); + + cmd->base.speed = priv->speed; + cmd->base.duplex = priv->full_duplex ? DUPLEX_FULL : DUPLEX_HALF; + cmd->base.port = PORT_TP; + cmd->base.autoneg = priv->autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE; + + return 0; +} + +static int +encx24j600_set_link_ksettings(struct net_device *dev, + const struct ethtool_link_ksettings *cmd) +{ + return encx24j600_setlink(dev, cmd->base.autoneg, + cmd->base.speed, cmd->base.duplex); +} + +static u32 encx24j600_get_msglevel(struct net_device *dev) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + return priv->msg_enable; +} + +static void encx24j600_set_msglevel(struct net_device *dev, u32 val) +{ + struct encx24j600_priv *priv = netdev_priv(dev); + + priv->msg_enable = val; +} + +static const struct ethtool_ops encx24j600_ethtool_ops = { + .get_drvinfo = encx24j600_get_drvinfo, + .get_msglevel = encx24j600_get_msglevel, + .set_msglevel = encx24j600_set_msglevel, + .get_regs_len = encx24j600_get_regs_len, + .get_regs = encx24j600_get_regs, + .get_link_ksettings = encx24j600_get_link_ksettings, + .set_link_ksettings = encx24j600_set_link_ksettings, +}; + +static const struct net_device_ops encx24j600_netdev_ops = { + .ndo_open = encx24j600_open, + .ndo_stop = encx24j600_stop, + .ndo_start_xmit = encx24j600_tx, + .ndo_set_rx_mode = encx24j600_set_multicast_list, + .ndo_set_mac_address = encx24j600_set_mac_address, + .ndo_tx_timeout = encx24j600_tx_timeout, + .ndo_validate_addr = eth_validate_addr, +}; + +static int encx24j600_spi_probe(struct spi_device *spi) +{ + int ret; + + struct net_device *ndev; + struct encx24j600_priv *priv; + u16 eidled; + + ndev = alloc_etherdev(sizeof(struct encx24j600_priv)); + + if (!ndev) { + ret = -ENOMEM; + goto error_out; + } + + priv = netdev_priv(ndev); + spi_set_drvdata(spi, priv); + dev_set_drvdata(&spi->dev, priv); + SET_NETDEV_DEV(ndev, &spi->dev); + + priv->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); + priv->ndev = ndev; + + /* Default configuration PHY configuration */ + priv->full_duplex = true; + priv->autoneg = AUTONEG_ENABLE; + priv->speed = SPEED_100; + + priv->ctx.spi = spi; + ndev->irq = spi->irq; + ndev->netdev_ops = &encx24j600_netdev_ops; + + ret = devm_regmap_init_encx24j600(&spi->dev, &priv->ctx); + if (ret) + goto out_free; + + mutex_init(&priv->lock); + + /* Reset device and check if it is connected */ + if (encx24j600_hw_reset(priv)) { + netif_err(priv, probe, ndev, + DRV_NAME ": Chip is not detected\n"); + ret = -EIO; + goto out_free; + } + + /* Initialize the device HW to the consistent state */ + if (encx24j600_hw_init(priv)) { + netif_err(priv, probe, ndev, + DRV_NAME ": HW initialization error\n"); + ret = -EIO; + goto out_free; + } + + kthread_init_worker(&priv->kworker); + kthread_init_work(&priv->tx_work, encx24j600_tx_proc); + kthread_init_work(&priv->setrx_work, encx24j600_setrx_proc); + + priv->kworker_task = kthread_run(kthread_worker_fn, &priv->kworker, + "encx24j600"); + + if (IS_ERR(priv->kworker_task)) { + ret = PTR_ERR(priv->kworker_task); + goto out_free; + } + + /* Get the MAC address from the chip */ + encx24j600_hw_get_macaddr(priv, ndev->dev_addr); + + ndev->ethtool_ops = &encx24j600_ethtool_ops; + + ret = register_netdev(ndev); + if (unlikely(ret)) { + netif_err(priv, probe, ndev, "Error %d initializing card encx24j600 card\n", + ret); + goto out_stop; + } + + eidled = encx24j600_read_reg(priv, EIDLED); + if (((eidled & DEVID_MASK) >> DEVID_SHIFT) != ENCX24J600_DEV_ID) { + ret = -EINVAL; + goto out_unregister; + } + + netif_info(priv, probe, ndev, "Silicon rev ID: 0x%02x\n", + (eidled & REVID_MASK) >> REVID_SHIFT); + + netif_info(priv, drv, priv->ndev, "MAC address %pM\n", ndev->dev_addr); + + return ret; + +out_unregister: + unregister_netdev(priv->ndev); +out_stop: + kthread_stop(priv->kworker_task); +out_free: + free_netdev(ndev); + +error_out: + return ret; +} + +static int encx24j600_spi_remove(struct spi_device *spi) +{ + struct encx24j600_priv *priv = dev_get_drvdata(&spi->dev); + + unregister_netdev(priv->ndev); + kthread_stop(priv->kworker_task); + + free_netdev(priv->ndev); + + return 0; +} + +static const struct spi_device_id encx24j600_spi_id_table[] = { + { .name = "encx24j600" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(spi, encx24j600_spi_id_table); + +static struct spi_driver encx24j600_spi_net_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .bus = &spi_bus_type, + }, + .probe = encx24j600_spi_probe, + .remove = encx24j600_spi_remove, + .id_table = encx24j600_spi_id_table, +}; + +static int __init encx24j600_init(void) +{ + return spi_register_driver(&encx24j600_spi_net_driver); +} +module_init(encx24j600_init); + +static void encx24j600_exit(void) +{ + spi_unregister_driver(&encx24j600_spi_net_driver); +} +module_exit(encx24j600_exit); + +MODULE_DESCRIPTION(DRV_NAME " ethernet driver"); +MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("spi:" DRV_NAME); |