diff options
Diffstat (limited to 'drivers/net/ethernet/aeroflex')
| -rw-r--r-- | drivers/net/ethernet/aeroflex/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/net/ethernet/aeroflex/Makefile | 6 | ||||
| -rw-r--r-- | drivers/net/ethernet/aeroflex/greth.c | 1576 | ||||
| -rw-r--r-- | drivers/net/ethernet/aeroflex/greth.h | 141 |
4 files changed, 1735 insertions, 0 deletions
diff --git a/drivers/net/ethernet/aeroflex/Kconfig b/drivers/net/ethernet/aeroflex/Kconfig new file mode 100644 index 000000000..ea4be67f7 --- /dev/null +++ b/drivers/net/ethernet/aeroflex/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Aeroflex Gaisler network device configuration +# + +config GRETH + tristate "Aeroflex Gaisler GRETH Ethernet MAC support" + depends on SPARC + select PHYLIB + select CRC32 + help + Say Y here if you want to use the Aeroflex Gaisler GRETH Ethernet MAC. diff --git a/drivers/net/ethernet/aeroflex/Makefile b/drivers/net/ethernet/aeroflex/Makefile new file mode 100644 index 000000000..1b18ef0a5 --- /dev/null +++ b/drivers/net/ethernet/aeroflex/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for the Aeroflex Gaisler network device drivers. +# + +obj-$(CONFIG_GRETH) += greth.o diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c new file mode 100644 index 000000000..0d56cb4f5 --- /dev/null +++ b/drivers/net/ethernet/aeroflex/greth.c @@ -0,0 +1,1576 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC. + * + * 2005-2010 (c) Aeroflex Gaisler AB + * + * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs + * available in the GRLIB VHDL IP core library. + * + * Full documentation of both cores can be found here: + * https://www.gaisler.com/products/grlib/grip.pdf + * + * The Gigabit version supports scatter/gather DMA, any alignment of + * buffers and checksum offloading. + * + * Contributors: Kristoffer Glembo + * Daniel Hellstrom + * Marko Isomaki + */ + +#include <linux/dma-mapping.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/skbuff.h> +#include <linux/io.h> +#include <linux/crc32.h> +#include <linux/mii.h> +#include <linux/of_device.h> +#include <linux/of_net.h> +#include <linux/of_platform.h> +#include <linux/slab.h> +#include <asm/cacheflush.h> +#include <asm/byteorder.h> + +#ifdef CONFIG_SPARC +#include <asm/idprom.h> +#endif + +#include "greth.h" + +#define GRETH_DEF_MSG_ENABLE \ + (NETIF_MSG_DRV | \ + NETIF_MSG_PROBE | \ + NETIF_MSG_LINK | \ + NETIF_MSG_IFDOWN | \ + NETIF_MSG_IFUP | \ + NETIF_MSG_RX_ERR | \ + NETIF_MSG_TX_ERR) + +static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */ +module_param(greth_debug, int, 0); +MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value"); + +/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */ +static int macaddr[6]; +module_param_array(macaddr, int, NULL, 0); +MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address"); + +static int greth_edcl = 1; +module_param(greth_edcl, int, 0); +MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used."); + +static int greth_open(struct net_device *dev); +static netdev_tx_t greth_start_xmit(struct sk_buff *skb, + struct net_device *dev); +static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb, + struct net_device *dev); +static int greth_rx(struct net_device *dev, int limit); +static int greth_rx_gbit(struct net_device *dev, int limit); +static void greth_clean_tx(struct net_device *dev); +static void greth_clean_tx_gbit(struct net_device *dev); +static irqreturn_t greth_interrupt(int irq, void *dev_id); +static int greth_close(struct net_device *dev); +static int greth_set_mac_add(struct net_device *dev, void *p); +static void greth_set_multicast_list(struct net_device *dev); + +#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a)))) +#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a))) +#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v)))) +#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v)))) + +#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK) +#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK) +#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK) + +static void greth_print_rx_packet(void *addr, int len) +{ + print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1, + addr, len, true); +} + +static void greth_print_tx_packet(struct sk_buff *skb) +{ + int i; + int length; + + if (skb_shinfo(skb)->nr_frags == 0) + length = skb->len; + else + length = skb_headlen(skb); + + print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, + skb->data, length, true); + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + + print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, + skb_frag_address(&skb_shinfo(skb)->frags[i]), + skb_frag_size(&skb_shinfo(skb)->frags[i]), true); + } +} + +static inline void greth_enable_tx(struct greth_private *greth) +{ + wmb(); + GRETH_REGORIN(greth->regs->control, GRETH_TXEN); +} + +static inline void greth_enable_tx_and_irq(struct greth_private *greth) +{ + wmb(); /* BDs must been written to memory before enabling TX */ + GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI); +} + +static inline void greth_disable_tx(struct greth_private *greth) +{ + GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN); +} + +static inline void greth_enable_rx(struct greth_private *greth) +{ + wmb(); + GRETH_REGORIN(greth->regs->control, GRETH_RXEN); +} + +static inline void greth_disable_rx(struct greth_private *greth) +{ + GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN); +} + +static inline void greth_enable_irqs(struct greth_private *greth) +{ + GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI); +} + +static inline void greth_disable_irqs(struct greth_private *greth) +{ + GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI)); +} + +static inline void greth_write_bd(u32 *bd, u32 val) +{ + __raw_writel(cpu_to_be32(val), bd); +} + +static inline u32 greth_read_bd(u32 *bd) +{ + return be32_to_cpu(__raw_readl(bd)); +} + +static void greth_clean_rings(struct greth_private *greth) +{ + int i; + struct greth_bd *rx_bdp = greth->rx_bd_base; + struct greth_bd *tx_bdp = greth->tx_bd_base; + + if (greth->gbit_mac) { + + /* Free and unmap RX buffers */ + for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { + if (greth->rx_skbuff[i] != NULL) { + dev_kfree_skb(greth->rx_skbuff[i]); + dma_unmap_single(greth->dev, + greth_read_bd(&rx_bdp->addr), + MAX_FRAME_SIZE+NET_IP_ALIGN, + DMA_FROM_DEVICE); + } + } + + /* TX buffers */ + while (greth->tx_free < GRETH_TXBD_NUM) { + + struct sk_buff *skb = greth->tx_skbuff[greth->tx_last]; + int nr_frags = skb_shinfo(skb)->nr_frags; + tx_bdp = greth->tx_bd_base + greth->tx_last; + greth->tx_last = NEXT_TX(greth->tx_last); + + dma_unmap_single(greth->dev, + greth_read_bd(&tx_bdp->addr), + skb_headlen(skb), + DMA_TO_DEVICE); + + for (i = 0; i < nr_frags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + tx_bdp = greth->tx_bd_base + greth->tx_last; + + dma_unmap_page(greth->dev, + greth_read_bd(&tx_bdp->addr), + skb_frag_size(frag), + DMA_TO_DEVICE); + + greth->tx_last = NEXT_TX(greth->tx_last); + } + greth->tx_free += nr_frags+1; + dev_kfree_skb(skb); + } + + + } else { /* 10/100 Mbps MAC */ + + for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { + kfree(greth->rx_bufs[i]); + dma_unmap_single(greth->dev, + greth_read_bd(&rx_bdp->addr), + MAX_FRAME_SIZE, + DMA_FROM_DEVICE); + } + for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) { + kfree(greth->tx_bufs[i]); + dma_unmap_single(greth->dev, + greth_read_bd(&tx_bdp->addr), + MAX_FRAME_SIZE, + DMA_TO_DEVICE); + } + } +} + +static int greth_init_rings(struct greth_private *greth) +{ + struct sk_buff *skb; + struct greth_bd *rx_bd, *tx_bd; + u32 dma_addr; + int i; + + rx_bd = greth->rx_bd_base; + tx_bd = greth->tx_bd_base; + + /* Initialize descriptor rings and buffers */ + if (greth->gbit_mac) { + + for (i = 0; i < GRETH_RXBD_NUM; i++) { + skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN); + if (skb == NULL) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Error allocating DMA ring.\n"); + goto cleanup; + } + skb_reserve(skb, NET_IP_ALIGN); + dma_addr = dma_map_single(greth->dev, + skb->data, + MAX_FRAME_SIZE+NET_IP_ALIGN, + DMA_FROM_DEVICE); + + if (dma_mapping_error(greth->dev, dma_addr)) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Could not create initial DMA mapping\n"); + dev_kfree_skb(skb); + goto cleanup; + } + greth->rx_skbuff[i] = skb; + greth_write_bd(&rx_bd[i].addr, dma_addr); + greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); + } + + } else { + + /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */ + for (i = 0; i < GRETH_RXBD_NUM; i++) { + + greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); + + if (greth->rx_bufs[i] == NULL) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Error allocating DMA ring.\n"); + goto cleanup; + } + + dma_addr = dma_map_single(greth->dev, + greth->rx_bufs[i], + MAX_FRAME_SIZE, + DMA_FROM_DEVICE); + + if (dma_mapping_error(greth->dev, dma_addr)) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Could not create initial DMA mapping\n"); + goto cleanup; + } + greth_write_bd(&rx_bd[i].addr, dma_addr); + greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); + } + for (i = 0; i < GRETH_TXBD_NUM; i++) { + + greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); + + if (greth->tx_bufs[i] == NULL) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Error allocating DMA ring.\n"); + goto cleanup; + } + + dma_addr = dma_map_single(greth->dev, + greth->tx_bufs[i], + MAX_FRAME_SIZE, + DMA_TO_DEVICE); + + if (dma_mapping_error(greth->dev, dma_addr)) { + if (netif_msg_ifup(greth)) + dev_err(greth->dev, "Could not create initial DMA mapping\n"); + goto cleanup; + } + greth_write_bd(&tx_bd[i].addr, dma_addr); + greth_write_bd(&tx_bd[i].stat, 0); + } + } + greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat, + greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR); + + /* Initialize pointers. */ + greth->rx_cur = 0; + greth->tx_next = 0; + greth->tx_last = 0; + greth->tx_free = GRETH_TXBD_NUM; + + /* Initialize descriptor base address */ + GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys); + GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys); + + return 0; + +cleanup: + greth_clean_rings(greth); + return -ENOMEM; +} + +static int greth_open(struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + int err; + + err = greth_init_rings(greth); + if (err) { + if (netif_msg_ifup(greth)) + dev_err(&dev->dev, "Could not allocate memory for DMA rings\n"); + return err; + } + + err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev); + if (err) { + if (netif_msg_ifup(greth)) + dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq); + greth_clean_rings(greth); + return err; + } + + if (netif_msg_ifup(greth)) + dev_dbg(&dev->dev, " starting queue\n"); + netif_start_queue(dev); + + GRETH_REGSAVE(greth->regs->status, 0xFF); + + napi_enable(&greth->napi); + + greth_enable_irqs(greth); + greth_enable_tx(greth); + greth_enable_rx(greth); + return 0; + +} + +static int greth_close(struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + + napi_disable(&greth->napi); + + greth_disable_irqs(greth); + greth_disable_tx(greth); + greth_disable_rx(greth); + + netif_stop_queue(dev); + + free_irq(greth->irq, (void *) dev); + + greth_clean_rings(greth); + + return 0; +} + +static netdev_tx_t +greth_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + struct greth_bd *bdp; + int err = NETDEV_TX_OK; + u32 status, dma_addr, ctrl; + unsigned long flags; + + /* Clean TX Ring */ + greth_clean_tx(greth->netdev); + + if (unlikely(greth->tx_free <= 0)) { + spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/ + ctrl = GRETH_REGLOAD(greth->regs->control); + /* Enable TX IRQ only if not already in poll() routine */ + if (ctrl & GRETH_RXI) + GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI); + netif_stop_queue(dev); + spin_unlock_irqrestore(&greth->devlock, flags); + return NETDEV_TX_BUSY; + } + + if (netif_msg_pktdata(greth)) + greth_print_tx_packet(skb); + + + if (unlikely(skb->len > MAX_FRAME_SIZE)) { + dev->stats.tx_errors++; + goto out; + } + + bdp = greth->tx_bd_base + greth->tx_next; + dma_addr = greth_read_bd(&bdp->addr); + + memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len); + + dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE); + + status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN); + greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN; + + /* Wrap around descriptor ring */ + if (greth->tx_next == GRETH_TXBD_NUM_MASK) { + status |= GRETH_BD_WR; + } + + greth->tx_next = NEXT_TX(greth->tx_next); + greth->tx_free--; + + /* Write descriptor control word and enable transmission */ + greth_write_bd(&bdp->stat, status); + spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/ + greth_enable_tx(greth); + spin_unlock_irqrestore(&greth->devlock, flags); + +out: + dev_kfree_skb(skb); + return err; +} + +static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next) +{ + if (tx_next < tx_last) + return (tx_last - tx_next) - 1; + else + return GRETH_TXBD_NUM - (tx_next - tx_last) - 1; +} + +static netdev_tx_t +greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + struct greth_bd *bdp; + u32 status, dma_addr; + int curr_tx, nr_frags, i, err = NETDEV_TX_OK; + unsigned long flags; + u16 tx_last; + + nr_frags = skb_shinfo(skb)->nr_frags; + tx_last = greth->tx_last; + rmb(); /* tx_last is updated by the poll task */ + + if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) { + netif_stop_queue(dev); + err = NETDEV_TX_BUSY; + goto out; + } + + if (netif_msg_pktdata(greth)) + greth_print_tx_packet(skb); + + if (unlikely(skb->len > MAX_FRAME_SIZE)) { + dev->stats.tx_errors++; + goto out; + } + + /* Save skb pointer. */ + greth->tx_skbuff[greth->tx_next] = skb; + + /* Linear buf */ + if (nr_frags != 0) + status = GRETH_TXBD_MORE; + else + status = GRETH_BD_IE; + + if (skb->ip_summed == CHECKSUM_PARTIAL) + status |= GRETH_TXBD_CSALL; + status |= skb_headlen(skb) & GRETH_BD_LEN; + if (greth->tx_next == GRETH_TXBD_NUM_MASK) + status |= GRETH_BD_WR; + + + bdp = greth->tx_bd_base + greth->tx_next; + greth_write_bd(&bdp->stat, status); + dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); + + if (unlikely(dma_mapping_error(greth->dev, dma_addr))) + goto map_error; + + greth_write_bd(&bdp->addr, dma_addr); + + curr_tx = NEXT_TX(greth->tx_next); + + /* Frags */ + for (i = 0; i < nr_frags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + greth->tx_skbuff[curr_tx] = NULL; + bdp = greth->tx_bd_base + curr_tx; + + status = GRETH_BD_EN; + if (skb->ip_summed == CHECKSUM_PARTIAL) + status |= GRETH_TXBD_CSALL; + status |= skb_frag_size(frag) & GRETH_BD_LEN; + + /* Wrap around descriptor ring */ + if (curr_tx == GRETH_TXBD_NUM_MASK) + status |= GRETH_BD_WR; + + /* More fragments left */ + if (i < nr_frags - 1) + status |= GRETH_TXBD_MORE; + else + status |= GRETH_BD_IE; /* enable IRQ on last fragment */ + + greth_write_bd(&bdp->stat, status); + + dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag), + DMA_TO_DEVICE); + + if (unlikely(dma_mapping_error(greth->dev, dma_addr))) + goto frag_map_error; + + greth_write_bd(&bdp->addr, dma_addr); + + curr_tx = NEXT_TX(curr_tx); + } + + wmb(); + + /* Enable the descriptor chain by enabling the first descriptor */ + bdp = greth->tx_bd_base + greth->tx_next; + greth_write_bd(&bdp->stat, + greth_read_bd(&bdp->stat) | GRETH_BD_EN); + + spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/ + greth->tx_next = curr_tx; + greth_enable_tx_and_irq(greth); + spin_unlock_irqrestore(&greth->devlock, flags); + + return NETDEV_TX_OK; + +frag_map_error: + /* Unmap SKB mappings that succeeded and disable descriptor */ + for (i = 0; greth->tx_next + i != curr_tx; i++) { + bdp = greth->tx_bd_base + greth->tx_next + i; + dma_unmap_single(greth->dev, + greth_read_bd(&bdp->addr), + greth_read_bd(&bdp->stat) & GRETH_BD_LEN, + DMA_TO_DEVICE); + greth_write_bd(&bdp->stat, 0); + } +map_error: + if (net_ratelimit()) + dev_warn(greth->dev, "Could not create TX DMA mapping\n"); + dev_kfree_skb(skb); +out: + return err; +} + +static irqreturn_t greth_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct greth_private *greth; + u32 status, ctrl; + irqreturn_t retval = IRQ_NONE; + + greth = netdev_priv(dev); + + spin_lock(&greth->devlock); + + /* Get the interrupt events that caused us to be here. */ + status = GRETH_REGLOAD(greth->regs->status); + + /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be + * set regardless of whether IRQ is enabled or not. Especially + * important when shared IRQ. + */ + ctrl = GRETH_REGLOAD(greth->regs->control); + + /* Handle rx and tx interrupts through poll */ + if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) || + ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) { + retval = IRQ_HANDLED; + + /* Disable interrupts and schedule poll() */ + greth_disable_irqs(greth); + napi_schedule(&greth->napi); + } + + spin_unlock(&greth->devlock); + + return retval; +} + +static void greth_clean_tx(struct net_device *dev) +{ + struct greth_private *greth; + struct greth_bd *bdp; + u32 stat; + + greth = netdev_priv(dev); + + while (1) { + bdp = greth->tx_bd_base + greth->tx_last; + GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX); + mb(); + stat = greth_read_bd(&bdp->stat); + + if (unlikely(stat & GRETH_BD_EN)) + break; + + if (greth->tx_free == GRETH_TXBD_NUM) + break; + + /* Check status for errors */ + if (unlikely(stat & GRETH_TXBD_STATUS)) { + dev->stats.tx_errors++; + if (stat & GRETH_TXBD_ERR_AL) + dev->stats.tx_aborted_errors++; + if (stat & GRETH_TXBD_ERR_UE) + dev->stats.tx_fifo_errors++; + } + dev->stats.tx_packets++; + dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last]; + greth->tx_last = NEXT_TX(greth->tx_last); + greth->tx_free++; + } + + if (greth->tx_free > 0) { + netif_wake_queue(dev); + } +} + +static inline void greth_update_tx_stats(struct net_device *dev, u32 stat) +{ + /* Check status for errors */ + if (unlikely(stat & GRETH_TXBD_STATUS)) { + dev->stats.tx_errors++; + if (stat & GRETH_TXBD_ERR_AL) + dev->stats.tx_aborted_errors++; + if (stat & GRETH_TXBD_ERR_UE) + dev->stats.tx_fifo_errors++; + if (stat & GRETH_TXBD_ERR_LC) + dev->stats.tx_aborted_errors++; + } + dev->stats.tx_packets++; +} + +static void greth_clean_tx_gbit(struct net_device *dev) +{ + struct greth_private *greth; + struct greth_bd *bdp, *bdp_last_frag; + struct sk_buff *skb = NULL; + u32 stat; + int nr_frags, i; + u16 tx_last; + + greth = netdev_priv(dev); + tx_last = greth->tx_last; + + while (tx_last != greth->tx_next) { + + skb = greth->tx_skbuff[tx_last]; + + nr_frags = skb_shinfo(skb)->nr_frags; + + /* We only clean fully completed SKBs */ + bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags); + + GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX); + mb(); + stat = greth_read_bd(&bdp_last_frag->stat); + + if (stat & GRETH_BD_EN) + break; + + greth->tx_skbuff[tx_last] = NULL; + + greth_update_tx_stats(dev, stat); + dev->stats.tx_bytes += skb->len; + + bdp = greth->tx_bd_base + tx_last; + + tx_last = NEXT_TX(tx_last); + + dma_unmap_single(greth->dev, + greth_read_bd(&bdp->addr), + skb_headlen(skb), + DMA_TO_DEVICE); + + for (i = 0; i < nr_frags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + bdp = greth->tx_bd_base + tx_last; + + dma_unmap_page(greth->dev, + greth_read_bd(&bdp->addr), + skb_frag_size(frag), + DMA_TO_DEVICE); + + tx_last = NEXT_TX(tx_last); + } + dev_kfree_skb(skb); + } + if (skb) { /* skb is set only if the above while loop was entered */ + wmb(); + greth->tx_last = tx_last; + + if (netif_queue_stopped(dev) && + (greth_num_free_bds(tx_last, greth->tx_next) > + (MAX_SKB_FRAGS+1))) + netif_wake_queue(dev); + } +} + +static int greth_rx(struct net_device *dev, int limit) +{ + struct greth_private *greth; + struct greth_bd *bdp; + struct sk_buff *skb; + int pkt_len; + int bad, count; + u32 status, dma_addr; + unsigned long flags; + + greth = netdev_priv(dev); + + for (count = 0; count < limit; ++count) { + + bdp = greth->rx_bd_base + greth->rx_cur; + GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX); + mb(); + status = greth_read_bd(&bdp->stat); + + if (unlikely(status & GRETH_BD_EN)) { + break; + } + + dma_addr = greth_read_bd(&bdp->addr); + bad = 0; + + /* Check status for errors. */ + if (unlikely(status & GRETH_RXBD_STATUS)) { + if (status & GRETH_RXBD_ERR_FT) { + dev->stats.rx_length_errors++; + bad = 1; + } + if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) { + dev->stats.rx_frame_errors++; + bad = 1; + } + if (status & GRETH_RXBD_ERR_CRC) { + dev->stats.rx_crc_errors++; + bad = 1; + } + } + if (unlikely(bad)) { + dev->stats.rx_errors++; + + } else { + + pkt_len = status & GRETH_BD_LEN; + + skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN); + + if (unlikely(skb == NULL)) { + + if (net_ratelimit()) + dev_warn(&dev->dev, "low on memory - " "packet dropped\n"); + + dev->stats.rx_dropped++; + + } else { + skb_reserve(skb, NET_IP_ALIGN); + + dma_sync_single_for_cpu(greth->dev, + dma_addr, + pkt_len, + DMA_FROM_DEVICE); + + if (netif_msg_pktdata(greth)) + greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len); + + skb_put_data(skb, phys_to_virt(dma_addr), + pkt_len); + + skb->protocol = eth_type_trans(skb, dev); + dev->stats.rx_bytes += pkt_len; + dev->stats.rx_packets++; + netif_receive_skb(skb); + } + } + + status = GRETH_BD_EN | GRETH_BD_IE; + if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { + status |= GRETH_BD_WR; + } + + wmb(); + greth_write_bd(&bdp->stat, status); + + dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE); + + spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */ + greth_enable_rx(greth); + spin_unlock_irqrestore(&greth->devlock, flags); + + greth->rx_cur = NEXT_RX(greth->rx_cur); + } + + return count; +} + +static inline int hw_checksummed(u32 status) +{ + + if (status & GRETH_RXBD_IP_FRAG) + return 0; + + if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR) + return 0; + + if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR) + return 0; + + if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR) + return 0; + + return 1; +} + +static int greth_rx_gbit(struct net_device *dev, int limit) +{ + struct greth_private *greth; + struct greth_bd *bdp; + struct sk_buff *skb, *newskb; + int pkt_len; + int bad, count = 0; + u32 status, dma_addr; + unsigned long flags; + + greth = netdev_priv(dev); + + for (count = 0; count < limit; ++count) { + + bdp = greth->rx_bd_base + greth->rx_cur; + skb = greth->rx_skbuff[greth->rx_cur]; + GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX); + mb(); + status = greth_read_bd(&bdp->stat); + bad = 0; + + if (status & GRETH_BD_EN) + break; + + /* Check status for errors. */ + if (unlikely(status & GRETH_RXBD_STATUS)) { + + if (status & GRETH_RXBD_ERR_FT) { + dev->stats.rx_length_errors++; + bad = 1; + } else if (status & + (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) { + dev->stats.rx_frame_errors++; + bad = 1; + } else if (status & GRETH_RXBD_ERR_CRC) { + dev->stats.rx_crc_errors++; + bad = 1; + } + } + + /* Allocate new skb to replace current, not needed if the + * current skb can be reused */ + if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) { + skb_reserve(newskb, NET_IP_ALIGN); + + dma_addr = dma_map_single(greth->dev, + newskb->data, + MAX_FRAME_SIZE + NET_IP_ALIGN, + DMA_FROM_DEVICE); + + if (!dma_mapping_error(greth->dev, dma_addr)) { + /* Process the incoming frame. */ + pkt_len = status & GRETH_BD_LEN; + + dma_unmap_single(greth->dev, + greth_read_bd(&bdp->addr), + MAX_FRAME_SIZE + NET_IP_ALIGN, + DMA_FROM_DEVICE); + + if (netif_msg_pktdata(greth)) + greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len); + + skb_put(skb, pkt_len); + + if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + else + skb_checksum_none_assert(skb); + + skb->protocol = eth_type_trans(skb, dev); + dev->stats.rx_packets++; + dev->stats.rx_bytes += pkt_len; + netif_receive_skb(skb); + + greth->rx_skbuff[greth->rx_cur] = newskb; + greth_write_bd(&bdp->addr, dma_addr); + } else { + if (net_ratelimit()) + dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n"); + dev_kfree_skb(newskb); + /* reusing current skb, so it is a drop */ + dev->stats.rx_dropped++; + } + } else if (bad) { + /* Bad Frame transfer, the skb is reused */ + dev->stats.rx_dropped++; + } else { + /* Failed Allocating a new skb. This is rather stupid + * but the current "filled" skb is reused, as if + * transfer failure. One could argue that RX descriptor + * table handling should be divided into cleaning and + * filling as the TX part of the driver + */ + if (net_ratelimit()) + dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n"); + /* reusing current skb, so it is a drop */ + dev->stats.rx_dropped++; + } + + status = GRETH_BD_EN | GRETH_BD_IE; + if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { + status |= GRETH_BD_WR; + } + + wmb(); + greth_write_bd(&bdp->stat, status); + spin_lock_irqsave(&greth->devlock, flags); + greth_enable_rx(greth); + spin_unlock_irqrestore(&greth->devlock, flags); + greth->rx_cur = NEXT_RX(greth->rx_cur); + } + + return count; + +} + +static int greth_poll(struct napi_struct *napi, int budget) +{ + struct greth_private *greth; + int work_done = 0; + unsigned long flags; + u32 mask, ctrl; + greth = container_of(napi, struct greth_private, napi); + +restart_txrx_poll: + if (greth->gbit_mac) { + greth_clean_tx_gbit(greth->netdev); + work_done += greth_rx_gbit(greth->netdev, budget - work_done); + } else { + if (netif_queue_stopped(greth->netdev)) + greth_clean_tx(greth->netdev); + work_done += greth_rx(greth->netdev, budget - work_done); + } + + if (work_done < budget) { + + spin_lock_irqsave(&greth->devlock, flags); + + ctrl = GRETH_REGLOAD(greth->regs->control); + if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) || + (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) { + GRETH_REGSAVE(greth->regs->control, + ctrl | GRETH_TXI | GRETH_RXI); + mask = GRETH_INT_RX | GRETH_INT_RE | + GRETH_INT_TX | GRETH_INT_TE; + } else { + GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI); + mask = GRETH_INT_RX | GRETH_INT_RE; + } + + if (GRETH_REGLOAD(greth->regs->status) & mask) { + GRETH_REGSAVE(greth->regs->control, ctrl); + spin_unlock_irqrestore(&greth->devlock, flags); + goto restart_txrx_poll; + } else { + napi_complete_done(napi, work_done); + spin_unlock_irqrestore(&greth->devlock, flags); + } + } + + return work_done; +} + +static int greth_set_mac_add(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + struct greth_private *greth; + struct greth_regs *regs; + + greth = netdev_priv(dev); + regs = greth->regs; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]); + GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 | + dev->dev_addr[4] << 8 | dev->dev_addr[5]); + + return 0; +} + +static u32 greth_hash_get_index(__u8 *addr) +{ + return (ether_crc(6, addr)) & 0x3F; +} + +static void greth_set_hash_filter(struct net_device *dev) +{ + struct netdev_hw_addr *ha; + struct greth_private *greth = netdev_priv(dev); + struct greth_regs *regs = greth->regs; + u32 mc_filter[2]; + unsigned int bitnr; + + mc_filter[0] = mc_filter[1] = 0; + + netdev_for_each_mc_addr(ha, dev) { + bitnr = greth_hash_get_index(ha->addr); + mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); + } + + GRETH_REGSAVE(regs->hash_msb, mc_filter[1]); + GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]); +} + +static void greth_set_multicast_list(struct net_device *dev) +{ + int cfg; + struct greth_private *greth = netdev_priv(dev); + struct greth_regs *regs = greth->regs; + + cfg = GRETH_REGLOAD(regs->control); + if (dev->flags & IFF_PROMISC) + cfg |= GRETH_CTRL_PR; + else + cfg &= ~GRETH_CTRL_PR; + + if (greth->multicast) { + if (dev->flags & IFF_ALLMULTI) { + GRETH_REGSAVE(regs->hash_msb, -1); + GRETH_REGSAVE(regs->hash_lsb, -1); + cfg |= GRETH_CTRL_MCEN; + GRETH_REGSAVE(regs->control, cfg); + return; + } + + if (netdev_mc_empty(dev)) { + cfg &= ~GRETH_CTRL_MCEN; + GRETH_REGSAVE(regs->control, cfg); + return; + } + + /* Setup multicast filter */ + greth_set_hash_filter(dev); + cfg |= GRETH_CTRL_MCEN; + } + GRETH_REGSAVE(regs->control, cfg); +} + +static u32 greth_get_msglevel(struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + return greth->msg_enable; +} + +static void greth_set_msglevel(struct net_device *dev, u32 value) +{ + struct greth_private *greth = netdev_priv(dev); + greth->msg_enable = value; +} + +static int greth_get_regs_len(struct net_device *dev) +{ + return sizeof(struct greth_regs); +} + +static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + struct greth_private *greth = netdev_priv(dev); + + strlcpy(info->driver, dev_driver_string(greth->dev), + sizeof(info->driver)); + strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info)); +} + +static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p) +{ + int i; + struct greth_private *greth = netdev_priv(dev); + u32 __iomem *greth_regs = (u32 __iomem *) greth->regs; + u32 *buff = p; + + for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++) + buff[i] = greth_read_bd(&greth_regs[i]); +} + +static const struct ethtool_ops greth_ethtool_ops = { + .get_msglevel = greth_get_msglevel, + .set_msglevel = greth_set_msglevel, + .get_drvinfo = greth_get_drvinfo, + .get_regs_len = greth_get_regs_len, + .get_regs = greth_get_regs, + .get_link = ethtool_op_get_link, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, +}; + +static struct net_device_ops greth_netdev_ops = { + .ndo_open = greth_open, + .ndo_stop = greth_close, + .ndo_start_xmit = greth_start_xmit, + .ndo_set_mac_address = greth_set_mac_add, + .ndo_validate_addr = eth_validate_addr, +}; + +static inline int wait_for_mdio(struct greth_private *greth) +{ + unsigned long timeout = jiffies + 4*HZ/100; + while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) { + if (time_after(jiffies, timeout)) + return 0; + } + return 1; +} + +static int greth_mdio_read(struct mii_bus *bus, int phy, int reg) +{ + struct greth_private *greth = bus->priv; + int data; + + if (!wait_for_mdio(greth)) + return -EBUSY; + + GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2); + + if (!wait_for_mdio(greth)) + return -EBUSY; + + if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) { + data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF; + return data; + + } else { + return -1; + } +} + +static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val) +{ + struct greth_private *greth = bus->priv; + + if (!wait_for_mdio(greth)) + return -EBUSY; + + GRETH_REGSAVE(greth->regs->mdio, + ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1); + + if (!wait_for_mdio(greth)) + return -EBUSY; + + return 0; +} + +static void greth_link_change(struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + struct phy_device *phydev = dev->phydev; + unsigned long flags; + int status_change = 0; + u32 ctrl; + + spin_lock_irqsave(&greth->devlock, flags); + + if (phydev->link) { + + if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) { + ctrl = GRETH_REGLOAD(greth->regs->control) & + ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB); + + if (phydev->duplex) + ctrl |= GRETH_CTRL_FD; + + if (phydev->speed == SPEED_100) + ctrl |= GRETH_CTRL_SP; + else if (phydev->speed == SPEED_1000) + ctrl |= GRETH_CTRL_GB; + + GRETH_REGSAVE(greth->regs->control, ctrl); + greth->speed = phydev->speed; + greth->duplex = phydev->duplex; + status_change = 1; + } + } + + if (phydev->link != greth->link) { + if (!phydev->link) { + greth->speed = 0; + greth->duplex = -1; + } + greth->link = phydev->link; + + status_change = 1; + } + + spin_unlock_irqrestore(&greth->devlock, flags); + + if (status_change) { + if (phydev->link) + pr_debug("%s: link up (%d/%s)\n", + dev->name, phydev->speed, + DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); + else + pr_debug("%s: link down\n", dev->name); + } +} + +static int greth_mdio_probe(struct net_device *dev) +{ + struct greth_private *greth = netdev_priv(dev); + struct phy_device *phy = NULL; + int ret; + + /* Find the first PHY */ + phy = phy_find_first(greth->mdio); + + if (!phy) { + if (netif_msg_probe(greth)) + dev_err(&dev->dev, "no PHY found\n"); + return -ENXIO; + } + + ret = phy_connect_direct(dev, phy, &greth_link_change, + greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII); + if (ret) { + if (netif_msg_ifup(greth)) + dev_err(&dev->dev, "could not attach to PHY\n"); + return ret; + } + + if (greth->gbit_mac) + phy_set_max_speed(phy, SPEED_1000); + else + phy_set_max_speed(phy, SPEED_100); + + linkmode_copy(phy->advertising, phy->supported); + + greth->link = 0; + greth->speed = 0; + greth->duplex = -1; + + return 0; +} + +static int greth_mdio_init(struct greth_private *greth) +{ + int ret; + unsigned long timeout; + struct net_device *ndev = greth->netdev; + + greth->mdio = mdiobus_alloc(); + if (!greth->mdio) { + return -ENOMEM; + } + + greth->mdio->name = "greth-mdio"; + snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq); + greth->mdio->read = greth_mdio_read; + greth->mdio->write = greth_mdio_write; + greth->mdio->priv = greth; + + ret = mdiobus_register(greth->mdio); + if (ret) { + goto error; + } + + ret = greth_mdio_probe(greth->netdev); + if (ret) { + if (netif_msg_probe(greth)) + dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n"); + goto unreg_mdio; + } + + phy_start(ndev->phydev); + + /* If Ethernet debug link is used make autoneg happen right away */ + if (greth->edcl && greth_edcl == 1) { + phy_start_aneg(ndev->phydev); + timeout = jiffies + 6*HZ; + while (!phy_aneg_done(ndev->phydev) && + time_before(jiffies, timeout)) { + } + phy_read_status(ndev->phydev); + greth_link_change(greth->netdev); + } + + return 0; + +unreg_mdio: + mdiobus_unregister(greth->mdio); +error: + mdiobus_free(greth->mdio); + return ret; +} + +/* Initialize the GRETH MAC */ +static int greth_of_probe(struct platform_device *ofdev) +{ + struct net_device *dev; + struct greth_private *greth; + struct greth_regs *regs; + + int i; + int err; + int tmp; + unsigned long timeout; + + dev = alloc_etherdev(sizeof(struct greth_private)); + + if (dev == NULL) + return -ENOMEM; + + greth = netdev_priv(dev); + greth->netdev = dev; + greth->dev = &ofdev->dev; + + if (greth_debug > 0) + greth->msg_enable = greth_debug; + else + greth->msg_enable = GRETH_DEF_MSG_ENABLE; + + spin_lock_init(&greth->devlock); + + greth->regs = of_ioremap(&ofdev->resource[0], 0, + resource_size(&ofdev->resource[0]), + "grlib-greth regs"); + + if (greth->regs == NULL) { + if (netif_msg_probe(greth)) + dev_err(greth->dev, "ioremap failure.\n"); + err = -EIO; + goto error1; + } + + regs = greth->regs; + greth->irq = ofdev->archdata.irqs[0]; + + dev_set_drvdata(greth->dev, dev); + SET_NETDEV_DEV(dev, greth->dev); + + if (netif_msg_probe(greth)) + dev_dbg(greth->dev, "resetting controller.\n"); + + /* Reset the controller. */ + GRETH_REGSAVE(regs->control, GRETH_RESET); + + /* Wait for MAC to reset itself */ + timeout = jiffies + HZ/100; + while (GRETH_REGLOAD(regs->control) & GRETH_RESET) { + if (time_after(jiffies, timeout)) { + err = -EIO; + if (netif_msg_probe(greth)) + dev_err(greth->dev, "timeout when waiting for reset.\n"); + goto error2; + } + } + + /* Get default PHY address */ + greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F; + + /* Check if we have GBIT capable MAC */ + tmp = GRETH_REGLOAD(regs->control); + greth->gbit_mac = (tmp >> 27) & 1; + + /* Check for multicast capability */ + greth->multicast = (tmp >> 25) & 1; + + greth->edcl = (tmp >> 31) & 1; + + /* If we have EDCL we disable the EDCL speed-duplex FSM so + * it doesn't interfere with the software */ + if (greth->edcl != 0) + GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX); + + /* Check if MAC can handle MDIO interrupts */ + greth->mdio_int_en = (tmp >> 26) & 1; + + err = greth_mdio_init(greth); + if (err) { + if (netif_msg_probe(greth)) + dev_err(greth->dev, "failed to register MDIO bus\n"); + goto error2; + } + + /* Allocate TX descriptor ring in coherent memory */ + greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024, + &greth->tx_bd_base_phys, + GFP_KERNEL); + if (!greth->tx_bd_base) { + err = -ENOMEM; + goto error3; + } + + /* Allocate RX descriptor ring in coherent memory */ + greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024, + &greth->rx_bd_base_phys, + GFP_KERNEL); + if (!greth->rx_bd_base) { + err = -ENOMEM; + goto error4; + } + + /* Get MAC address from: module param, OF property or ID prom */ + for (i = 0; i < 6; i++) { + if (macaddr[i] != 0) + break; + } + if (i == 6) { + const u8 *addr; + + addr = of_get_mac_address(ofdev->dev.of_node); + if (!IS_ERR(addr)) { + for (i = 0; i < 6; i++) + macaddr[i] = (unsigned int) addr[i]; + } else { +#ifdef CONFIG_SPARC + for (i = 0; i < 6; i++) + macaddr[i] = (unsigned int) idprom->id_ethaddr[i]; +#endif + } + } + + for (i = 0; i < 6; i++) + dev->dev_addr[i] = macaddr[i]; + + macaddr[5]++; + + if (!is_valid_ether_addr(&dev->dev_addr[0])) { + if (netif_msg_probe(greth)) + dev_err(greth->dev, "no valid ethernet address, aborting.\n"); + err = -EINVAL; + goto error5; + } + + GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]); + GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 | + dev->dev_addr[4] << 8 | dev->dev_addr[5]); + + /* Clear all pending interrupts except PHY irq */ + GRETH_REGSAVE(regs->status, 0xFF); + + if (greth->gbit_mac) { + dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | + NETIF_F_RXCSUM; + dev->features = dev->hw_features | NETIF_F_HIGHDMA; + greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit; + } + + if (greth->multicast) { + greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list; + dev->flags |= IFF_MULTICAST; + } else { + dev->flags &= ~IFF_MULTICAST; + } + + dev->netdev_ops = &greth_netdev_ops; + dev->ethtool_ops = &greth_ethtool_ops; + + err = register_netdev(dev); + if (err) { + if (netif_msg_probe(greth)) + dev_err(greth->dev, "netdevice registration failed.\n"); + goto error5; + } + + /* setup NAPI */ + netif_napi_add(dev, &greth->napi, greth_poll, 64); + + return 0; + +error5: + dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); +error4: + dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); +error3: + mdiobus_unregister(greth->mdio); +error2: + of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0])); +error1: + free_netdev(dev); + return err; +} + +static int greth_of_remove(struct platform_device *of_dev) +{ + struct net_device *ndev = platform_get_drvdata(of_dev); + struct greth_private *greth = netdev_priv(ndev); + + /* Free descriptor areas */ + dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); + + dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); + + if (ndev->phydev) + phy_stop(ndev->phydev); + mdiobus_unregister(greth->mdio); + + unregister_netdev(ndev); + + of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0])); + + free_netdev(ndev); + + return 0; +} + +static const struct of_device_id greth_of_match[] = { + { + .name = "GAISLER_ETHMAC", + }, + { + .name = "01_01d", + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, greth_of_match); + +static struct platform_driver greth_of_driver = { + .driver = { + .name = "grlib-greth", + .of_match_table = greth_of_match, + }, + .probe = greth_of_probe, + .remove = greth_of_remove, +}; + +module_platform_driver(greth_of_driver); + +MODULE_AUTHOR("Aeroflex Gaisler AB."); +MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/ethernet/aeroflex/greth.h b/drivers/net/ethernet/aeroflex/greth.h new file mode 100644 index 000000000..a1e04c9e9 --- /dev/null +++ b/drivers/net/ethernet/aeroflex/greth.h @@ -0,0 +1,141 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef GRETH_H +#define GRETH_H + +#include <linux/phy.h> + +/* Register bits and masks */ +#define GRETH_RESET 0x40 +#define GRETH_MII_BUSY 0x8 +#define GRETH_MII_NVALID 0x10 + +#define GRETH_CTRL_FD 0x10 +#define GRETH_CTRL_PR 0x20 +#define GRETH_CTRL_SP 0x80 +#define GRETH_CTRL_GB 0x100 +#define GRETH_CTRL_PSTATIEN 0x400 +#define GRETH_CTRL_MCEN 0x800 +#define GRETH_CTRL_DISDUPLEX 0x1000 +#define GRETH_STATUS_PHYSTAT 0x100 + +#define GRETH_BD_EN 0x800 +#define GRETH_BD_WR 0x1000 +#define GRETH_BD_IE 0x2000 +#define GRETH_BD_LEN 0x7FF + +#define GRETH_TXEN 0x1 +#define GRETH_INT_TE 0x2 +#define GRETH_INT_TX 0x8 +#define GRETH_TXI 0x4 +#define GRETH_TXBD_STATUS 0x0001C000 +#define GRETH_TXBD_MORE 0x20000 +#define GRETH_TXBD_IPCS 0x40000 +#define GRETH_TXBD_TCPCS 0x80000 +#define GRETH_TXBD_UDPCS 0x100000 +#define GRETH_TXBD_CSALL (GRETH_TXBD_IPCS | GRETH_TXBD_TCPCS | GRETH_TXBD_UDPCS) +#define GRETH_TXBD_ERR_LC 0x10000 +#define GRETH_TXBD_ERR_UE 0x4000 +#define GRETH_TXBD_ERR_AL 0x8000 + +#define GRETH_INT_RE 0x1 +#define GRETH_INT_RX 0x4 +#define GRETH_RXEN 0x2 +#define GRETH_RXI 0x8 +#define GRETH_RXBD_STATUS 0xFFFFC000 +#define GRETH_RXBD_ERR_AE 0x4000 +#define GRETH_RXBD_ERR_FT 0x8000 +#define GRETH_RXBD_ERR_CRC 0x10000 +#define GRETH_RXBD_ERR_OE 0x20000 +#define GRETH_RXBD_ERR_LE 0x40000 +#define GRETH_RXBD_IP 0x80000 +#define GRETH_RXBD_IP_CSERR 0x100000 +#define GRETH_RXBD_UDP 0x200000 +#define GRETH_RXBD_UDP_CSERR 0x400000 +#define GRETH_RXBD_TCP 0x800000 +#define GRETH_RXBD_TCP_CSERR 0x1000000 +#define GRETH_RXBD_IP_FRAG 0x2000000 +#define GRETH_RXBD_MCAST 0x4000000 + +/* Descriptor parameters */ +#define GRETH_TXBD_NUM 128 +#define GRETH_TXBD_NUM_MASK (GRETH_TXBD_NUM-1) +#define GRETH_TX_BUF_SIZE 2048 +#define GRETH_RXBD_NUM 128 +#define GRETH_RXBD_NUM_MASK (GRETH_RXBD_NUM-1) +#define GRETH_RX_BUF_SIZE 2048 + +/* Buffers per page */ +#define GRETH_RX_BUF_PPGAE (PAGE_SIZE/GRETH_RX_BUF_SIZE) +#define GRETH_TX_BUF_PPGAE (PAGE_SIZE/GRETH_TX_BUF_SIZE) + +/* How many pages are needed for buffers */ +#define GRETH_RX_BUF_PAGE_NUM (GRETH_RXBD_NUM/GRETH_RX_BUF_PPGAE) +#define GRETH_TX_BUF_PAGE_NUM (GRETH_TXBD_NUM/GRETH_TX_BUF_PPGAE) + +/* Buffer size. + * Gbit MAC uses tagged maximum frame size which is 1518 excluding CRC. + * Set to 1520 to make all buffers word aligned for non-gbit MAC. + */ +#define MAX_FRAME_SIZE 1520 + +/* GRETH APB registers */ +struct greth_regs { + u32 control; + u32 status; + u32 esa_msb; + u32 esa_lsb; + u32 mdio; + u32 tx_desc_p; + u32 rx_desc_p; + u32 edclip; + u32 hash_msb; + u32 hash_lsb; +}; + +/* GRETH buffer descriptor */ +struct greth_bd { + u32 stat; + u32 addr; +}; + +struct greth_private { + struct sk_buff *rx_skbuff[GRETH_RXBD_NUM]; + struct sk_buff *tx_skbuff[GRETH_TXBD_NUM]; + + unsigned char *tx_bufs[GRETH_TXBD_NUM]; + unsigned char *rx_bufs[GRETH_RXBD_NUM]; + u16 tx_bufs_length[GRETH_TXBD_NUM]; + + u16 tx_next; + u16 tx_last; + u16 tx_free; /* only used on 10/100Mbit */ + u16 rx_cur; + + struct greth_regs *regs; /* Address of controller registers. */ + struct greth_bd *rx_bd_base; /* Address of Rx BDs. */ + struct greth_bd *tx_bd_base; /* Address of Tx BDs. */ + dma_addr_t rx_bd_base_phys; + dma_addr_t tx_bd_base_phys; + + int irq; + + struct device *dev; /* Pointer to platform_device->dev */ + struct net_device *netdev; + struct napi_struct napi; + spinlock_t devlock; + + struct mii_bus *mdio; + unsigned int link; + unsigned int speed; + unsigned int duplex; + + u32 msg_enable; + + u8 phyaddr; + u8 multicast; + u8 gbit_mac; + u8 mdio_int_en; + u8 edcl; +}; + +#endif |