/* * Network device driver for Cell Processor-Based Blade * * (C) Copyright IBM Corp. 2005 * * Authors : Utz Bacher <utz.bacher@de.ibm.com> * Jens Osterkamp <Jens.Osterkamp@de.ibm.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, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/compiler.h> #include <linux/crc32.h> #include <linux/delay.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/firmware.h> #include <linux/if_vlan.h> #include <linux/in.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/ip.h> #include <linux/kernel.h> #include <linux/mii.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/device.h> #include <linux/pci.h> #include <linux/skbuff.h> #include <linux/slab.h> #include <linux/tcp.h> #include <linux/types.h> #include <linux/vmalloc.h> #include <linux/wait.h> #include <linux/workqueue.h> #include <asm/bitops.h> #include <asm/pci-bridge.h> #include <net/checksum.h> #include "spider_net.h" MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \ "<Jens.Osterkamp@de.ibm.com>"); MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(VERSION); static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT; static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT; module_param(rx_descriptors, int, 0444); module_param(tx_descriptors, int, 0444); MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \ "in rx chains"); MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \ "in tx chain"); char spider_net_driver_name[] = "spidernet"; static struct pci_device_id spider_net_pci_tbl[] = { { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { 0, } }; MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl); /** * spider_net_read_reg - reads an SMMIO register of a card * @card: device structure * @reg: register to read from * * returns the content of the specified SMMIO register. */ static inline u32 spider_net_read_reg(struct spider_net_card *card, u32 reg) { /* We use the powerpc specific variants instead of readl_be() because * we know spidernet is not a real PCI device and we can thus avoid the * performance hit caused by the PCI workarounds. */ return in_be32(card->regs + reg); } /** * spider_net_write_reg - writes to an SMMIO register of a card * @card: device structure * @reg: register to write to * @value: value to write into the specified SMMIO register */ static inline void spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value) { /* We use the powerpc specific variants instead of writel_be() because * we know spidernet is not a real PCI device and we can thus avoid the * performance hit caused by the PCI workarounds. */ out_be32(card->regs + reg, value); } /** spider_net_write_phy - write to phy register * @netdev: adapter to be written to * @mii_id: id of MII * @reg: PHY register * @val: value to be written to phy register * * spider_net_write_phy_register writes to an arbitrary PHY * register via the spider GPCWOPCMD register. We assume the queue does * not run full (not more than 15 commands outstanding). **/ static void spider_net_write_phy(struct net_device *netdev, int mii_id, int reg, int val) { struct spider_net_card *card = netdev_priv(netdev); u32 writevalue; writevalue = ((u32)mii_id << 21) | ((u32)reg << 16) | ((u32)val); spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue); } /** spider_net_read_phy - read from phy register * @netdev: network device to be read from * @mii_id: id of MII * @reg: PHY register * * Returns value read from PHY register * * spider_net_write_phy reads from an arbitrary PHY * register via the spider GPCROPCMD register **/ static int spider_net_read_phy(struct net_device *netdev, int mii_id, int reg) { struct spider_net_card *card = netdev_priv(netdev); u32 readvalue; readvalue = ((u32)mii_id << 21) | ((u32)reg << 16); spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue); /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT * interrupt, as we poll for the completion of the read operation * in spider_net_read_phy. Should take about 50 us */ do { readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD); } while (readvalue & SPIDER_NET_GPREXEC); readvalue &= SPIDER_NET_GPRDAT_MASK; return readvalue; } /** * spider_net_rx_irq_off - switch off rx irq on this spider card * @card: device structure * * switches off rx irq by masking them out in the GHIINTnMSK register */ static void spider_net_rx_irq_off(struct spider_net_card *card) { u32 regvalue; regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT); spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); } /** * spider_net_rx_irq_on - switch on rx irq on this spider card * @card: device structure * * switches on rx irq by enabling them in the GHIINTnMSK register */ static void spider_net_rx_irq_on(struct spider_net_card *card) { u32 regvalue; regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT; spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); } /** * spider_net_set_promisc - sets the unicast address or the promiscuous mode * @card: card structure * * spider_net_set_promisc sets the unicast destination address filter and * thus either allows for non-promisc mode or promisc mode */ static void spider_net_set_promisc(struct spider_net_card *card) { u32 macu, macl; struct net_device *netdev = card->netdev; if (netdev->flags & IFF_PROMISC) { /* clear destination entry 0 */ spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0); spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0); spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, SPIDER_NET_PROMISC_VALUE); } else { macu = netdev->dev_addr[0]; macu <<= 8; macu |= netdev->dev_addr[1]; memcpy(&macl, &netdev->dev_addr[2], sizeof(macl)); macu |= SPIDER_NET_UA_DESCR_VALUE; spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu); spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl); spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, SPIDER_NET_NONPROMISC_VALUE); } } /** * spider_net_get_mac_address - read mac address from spider card * @card: device structure * * reads MAC address from GMACUNIMACU and GMACUNIMACL registers */ static int spider_net_get_mac_address(struct net_device *netdev) { struct spider_net_card *card = netdev_priv(netdev); u32 macl, macu; macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL); macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU); netdev->dev_addr[0] = (macu >> 24) & 0xff; netdev->dev_addr[1] = (macu >> 16) & 0xff; netdev->dev_addr[2] = (macu >> 8) & 0xff; netdev->dev_addr[3] = macu & 0xff; netdev->dev_addr[4] = (macl >> 8) & 0xff; netdev->dev_addr[5] = macl & 0xff; if (!is_valid_ether_addr(&netdev->dev_addr[0])) return -EINVAL; return 0; } /** * spider_net_get_descr_status -- returns the status of a descriptor * @descr: descriptor to look at * * returns the status as in the dmac_cmd_status field of the descriptor */ static inline int spider_net_get_descr_status(struct spider_net_descr *descr) { return descr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK; } /** * spider_net_free_chain - free descriptor chain * @card: card structure * @chain: address of chain * */ static void spider_net_free_chain(struct spider_net_card *card, struct spider_net_descr_chain *chain) { struct spider_net_descr *descr; descr = chain->ring; do { descr->bus_addr = 0; descr->next_descr_addr = 0; descr = descr->next; } while (descr != chain->ring); dma_free_coherent(&card->pdev->dev, chain->num_desc, chain->ring, chain->dma_addr); } /** * spider_net_init_chain - alloc and link descriptor chain * @card: card structure * @chain: address of chain * * We manage a circular list that mirrors the hardware structure, * except that the hardware uses bus addresses. * * Returns 0 on success, <0 on failure */ static int spider_net_init_chain(struct spider_net_card *card, struct spider_net_descr_chain *chain) { int i; struct spider_net_descr *descr; dma_addr_t buf; size_t alloc_size; alloc_size = chain->num_desc * sizeof (struct spider_net_descr); chain->ring = dma_alloc_coherent(&card->pdev->dev, alloc_size, &chain->dma_addr, GFP_KERNEL); if (!chain->ring) return -ENOMEM; descr = chain->ring; memset(descr, 0, alloc_size); /* Set up the hardware pointers in each descriptor */ buf = chain->dma_addr; for (i=0; i < chain->num_desc; i++, descr++) { descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; descr->bus_addr = buf; descr->next_descr_addr = 0; descr->next = descr + 1; descr->prev = descr - 1; buf += sizeof(struct spider_net_descr); } /* do actual circular list */ (descr-1)->next = chain->ring; chain->ring->prev = descr-1; spin_lock_init(&chain->lock); chain->head = chain->ring; chain->tail = chain->ring; return 0; } /** * spider_net_free_rx_chain_contents - frees descr contents in rx chain * @card: card structure * * returns 0 on success, <0 on failure */ static void spider_net_free_rx_chain_contents(struct spider_net_card *card) { struct spider_net_descr *descr; descr = card->rx_chain.head; do { if (descr->skb) { dev_kfree_skb(descr->skb); pci_unmap_single(card->pdev, descr->buf_addr, SPIDER_NET_MAX_FRAME, PCI_DMA_BIDIRECTIONAL); } descr = descr->next; } while (descr != card->rx_chain.head); } /** * spider_net_prepare_rx_descr - Reinitialize RX descriptor * @card: card structure * @descr: descriptor to re-init * * Return 0 on succes, <0 on failure. * * Allocates a new rx skb, iommu-maps it and attaches it to the * descriptor. Mark the descriptor as activated, ready-to-use. */ static int spider_net_prepare_rx_descr(struct spider_net_card *card, struct spider_net_descr *descr) { dma_addr_t buf; int offset; int bufsize; /* we need to round up the buffer size to a multiple of 128 */ bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) & (~(SPIDER_NET_RXBUF_ALIGN - 1)); /* and we need to have it 128 byte aligned, therefore we allocate a * bit more */ /* allocate an skb */ descr->skb = dev_alloc_skb(bufsize + SPIDER_NET_RXBUF_ALIGN - 1); if (!descr->skb) { if (netif_msg_rx_err(card) && net_ratelimit()) pr_err("Not enough memory to allocate rx buffer\n"); card->spider_stats.alloc_rx_skb_error++; return -ENOMEM; } descr->buf_size = bufsize; descr->result_size = 0; descr->valid_size = 0; descr->data_status = 0; descr->data_error = 0; offset = ((unsigned long)descr->skb->data) & (SPIDER_NET_RXBUF_ALIGN - 1); if (offset) skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset); /* iommu-map the skb */ buf = pci_map_single(card->pdev, descr->skb->data, SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); descr->buf_addr = buf; if (pci_dma_mapping_error(buf)) { dev_kfree_skb_any(descr->skb); if (netif_msg_rx_err(card) && net_ratelimit()) pr_err("Could not iommu-map rx buffer\n"); card->spider_stats.rx_iommu_map_error++; descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; } else { descr->next_descr_addr = 0; wmb(); descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOINTR_COMPLETE; wmb(); descr->prev->next_descr_addr = descr->bus_addr; } return 0; } /** * spider_net_enable_rxchtails - sets RX dmac chain tail addresses * @card: card structure * * spider_net_enable_rxchtails sets the RX DMAC chain tail adresses in the * chip by writing to the appropriate register. DMA is enabled in * spider_net_enable_rxdmac. */ static inline void spider_net_enable_rxchtails(struct spider_net_card *card) { /* assume chain is aligned correctly */ spider_net_write_reg(card, SPIDER_NET_GDADCHA , card->rx_chain.tail->bus_addr); } /** * spider_net_enable_rxdmac - enables a receive DMA controller * @card: card structure * * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN * in the GDADMACCNTR register */ static inline void spider_net_enable_rxdmac(struct spider_net_card *card) { wmb(); spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, SPIDER_NET_DMA_RX_VALUE); } /** * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains * @card: card structure * * refills descriptors in the rx chain: allocates skbs and iommu-maps them. */ static void spider_net_refill_rx_chain(struct spider_net_card *card) { struct spider_net_descr_chain *chain = &card->rx_chain; unsigned long flags; /* one context doing the refill (and a second context seeing that * and omitting it) is ok. If called by NAPI, we'll be called again * as spider_net_decode_one_descr is called several times. If some * interrupt calls us, the NAPI is about to clean up anyway. */ if (!spin_trylock_irqsave(&chain->lock, flags)) return; while (spider_net_get_descr_status(chain->head) == SPIDER_NET_DESCR_NOT_IN_USE) { if (spider_net_prepare_rx_descr(card, chain->head)) break; chain->head = chain->head->next; } spin_unlock_irqrestore(&chain->lock, flags); } /** * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains * @card: card structure * * Returns 0 on success, <0 on failure. */ static int spider_net_alloc_rx_skbs(struct spider_net_card *card) { int result; struct spider_net_descr_chain *chain; result = -ENOMEM; chain = &card->rx_chain; /* Put at least one buffer into the chain. if this fails, * we've got a problem. If not, spider_net_refill_rx_chain * will do the rest at the end of this function. */ if (spider_net_prepare_rx_descr(card, chain->head)) goto error; else chain->head = chain->head->next; /* This will allocate the rest of the rx buffers; * if not, it's business as usual later on. */ spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); return 0; error: spider_net_free_rx_chain_contents(card); return result; } /** * spider_net_get_multicast_hash - generates hash for multicast filter table * @addr: multicast address * * returns the hash value. * * spider_net_get_multicast_hash calculates a hash value for a given multicast * address, that is used to set the multicast filter tables */ static u8 spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr) { u32 crc; u8 hash; char addr_for_crc[ETH_ALEN] = { 0, }; int i, bit; for (i = 0; i < ETH_ALEN * 8; i++) { bit = (addr[i / 8] >> (i % 8)) & 1; addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8)); } crc = crc32_be(~0, addr_for_crc, netdev->addr_len); hash = (crc >> 27); hash <<= 3; hash |= crc & 7; hash &= 0xff; return hash; } /** * spider_net_set_multi - sets multicast addresses and promisc flags * @netdev: interface device structure * * spider_net_set_multi configures multicast addresses as needed for the * netdev interface. It also sets up multicast, allmulti and promisc * flags appropriately */ static void spider_net_set_multi(struct net_device *netdev) { struct dev_mc_list *mc; u8 hash; int i; u32 reg; struct spider_net_card *card = netdev_priv(netdev); unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] = {0, }; spider_net_set_promisc(card); if (netdev->flags & IFF_ALLMULTI) { for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) { set_bit(i, bitmask); } goto write_hash; } /* well, we know, what the broadcast hash value is: it's xfd hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */ set_bit(0xfd, bitmask); for (mc = netdev->mc_list; mc; mc = mc->next) { hash = spider_net_get_multicast_hash(netdev, mc->dmi_addr); set_bit(hash, bitmask); } write_hash: for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) { reg = 0; if (test_bit(i * 4, bitmask)) reg += 0x08; reg <<= 8; if (test_bit(i * 4 + 1, bitmask)) reg += 0x08; reg <<= 8; if (test_bit(i * 4 + 2, bitmask)) reg += 0x08; reg <<= 8; if (test_bit(i * 4 + 3, bitmask)) reg += 0x08; spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg); } } /** * spider_net_disable_rxdmac - disables the receive DMA controller * @card: card structure * * spider_net_disable_rxdmac terminates processing on the DMA controller by * turing off DMA and issueing a force end */ static void spider_net_disable_rxdmac(struct spider_net_card *card) { spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, SPIDER_NET_DMA_RX_FEND_VALUE); } /** * spider_net_prepare_tx_descr - fill tx descriptor with skb data * @card: card structure * @descr: descriptor structure to fill out * @skb: packet to use * * returns 0 on success, <0 on failure. * * fills out the descriptor structure with skb data and len. Copies data, * if needed (32bit DMA!) */ static int spider_net_prepare_tx_descr(struct spider_net_card *card, struct sk_buff *skb) { struct spider_net_descr *descr; dma_addr_t buf; unsigned long flags; buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE); if (pci_dma_mapping_error(buf)) { if (netif_msg_tx_err(card) && net_ratelimit()) pr_err("could not iommu-map packet (%p, %i). " "Dropping packet\n", skb->data, skb->len); card->spider_stats.tx_iommu_map_error++; return -ENOMEM; } spin_lock_irqsave(&card->tx_chain.lock, flags); descr = card->tx_chain.head; card->tx_chain.head = descr->next; descr->buf_addr = buf; descr->buf_size = skb->len; descr->next_descr_addr = 0; descr->skb = skb; descr->data_status = 0; descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOCS; spin_unlock_irqrestore(&card->tx_chain.lock, flags); if (skb->protocol == htons(ETH_P_IP)) switch (skb->nh.iph->protocol) { case IPPROTO_TCP: descr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP; break; case IPPROTO_UDP: descr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP; break; } /* Chain the bus address, so that the DMA engine finds this descr. */ descr->prev->next_descr_addr = descr->bus_addr; card->netdev->trans_start = jiffies; /* set netdev watchdog timer */ return 0; } static int spider_net_set_low_watermark(struct spider_net_card *card) { unsigned long flags; int status; int cnt=0; int i; struct spider_net_descr *descr = card->tx_chain.tail; /* Measure the length of the queue. Measurement does not * need to be precise -- does not need a lock. */ while (descr != card->tx_chain.head) { status = descr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE; if (status == SPIDER_NET_DESCR_NOT_IN_USE) break; descr = descr->next; cnt++; } /* If TX queue is short, don't even bother with interrupts */ if (cnt < card->tx_chain.num_desc/4) return cnt; /* Set low-watermark 3/4th's of the way into the queue. */ descr = card->tx_chain.tail; cnt = (cnt*3)/4; for (i=0;i<cnt; i++) descr = descr->next; /* Set the new watermark, clear the old watermark */ spin_lock_irqsave(&card->tx_chain.lock, flags); descr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG; if (card->low_watermark && card->low_watermark != descr) card->low_watermark->dmac_cmd_status = card->low_watermark->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG; card->low_watermark = descr; spin_unlock_irqrestore(&card->tx_chain.lock, flags); return cnt; } /** * spider_net_release_tx_chain - processes sent tx descriptors * @card: adapter structure * @brutal: if set, don't care about whether descriptor seems to be in use * * returns 0 if the tx ring is empty, otherwise 1. * * spider_net_release_tx_chain releases the tx descriptors that spider has * finished with (if non-brutal) or simply release tx descriptors (if brutal). * If some other context is calling this function, we return 1 so that we're * scheduled again (if we were scheduled) and will not loose initiative. */ static int spider_net_release_tx_chain(struct spider_net_card *card, int brutal) { struct spider_net_descr_chain *chain = &card->tx_chain; struct spider_net_descr *descr; struct sk_buff *skb; u32 buf_addr; unsigned long flags; int status; while (chain->tail != chain->head) { spin_lock_irqsave(&chain->lock, flags); descr = chain->tail; status = spider_net_get_descr_status(descr); switch (status) { case SPIDER_NET_DESCR_COMPLETE: card->netdev_stats.tx_packets++; card->netdev_stats.tx_bytes += descr->skb->len; break; case SPIDER_NET_DESCR_CARDOWNED: if (!brutal) { spin_unlock_irqrestore(&chain->lock, flags); return 1; } /* fallthrough, if we release the descriptors * brutally (then we don't care about * SPIDER_NET_DESCR_CARDOWNED) */ case SPIDER_NET_DESCR_RESPONSE_ERROR: case SPIDER_NET_DESCR_PROTECTION_ERROR: case SPIDER_NET_DESCR_FORCE_END: if (netif_msg_tx_err(card)) pr_err("%s: forcing end of tx descriptor " "with status x%02x\n", card->netdev->name, status); card->netdev_stats.tx_errors++; break; default: card->netdev_stats.tx_dropped++; if (!brutal) { spin_unlock_irqrestore(&chain->lock, flags); return 1; } } chain->tail = descr->next; descr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE; skb = descr->skb; buf_addr = descr->buf_addr; spin_unlock_irqrestore(&chain->lock, flags); /* unmap the skb */ if (skb) { pci_unmap_single(card->pdev, buf_addr, skb->len, PCI_DMA_TODEVICE); dev_kfree_skb(skb); } } return 0; } /** * spider_net_kick_tx_dma - enables TX DMA processing * @card: card structure * @descr: descriptor address to enable TX processing at * * This routine will start the transmit DMA running if * it is not already running. This routine ned only be * called when queueing a new packet to an empty tx queue. * Writes the current tx chain head as start address * of the tx descriptor chain and enables the transmission * DMA engine. */ static inline void spider_net_kick_tx_dma(struct spider_net_card *card) { struct spider_net_descr *descr; if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) & SPIDER_NET_TX_DMA_EN) goto out; descr = card->tx_chain.tail; for (;;) { if (spider_net_get_descr_status(descr) == SPIDER_NET_DESCR_CARDOWNED) { spider_net_write_reg(card, SPIDER_NET_GDTDCHA, descr->bus_addr); spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, SPIDER_NET_DMA_TX_VALUE); break; } if (descr == card->tx_chain.head) break; descr = descr->next; } out: mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER); } /** * spider_net_xmit - transmits a frame over the device * @skb: packet to send out * @netdev: interface device structure * * returns 0 on success, !0 on failure */ static int spider_net_xmit(struct sk_buff *skb, struct net_device *netdev) { int cnt; struct spider_net_card *card = netdev_priv(netdev); struct spider_net_descr_chain *chain = &card->tx_chain; spider_net_release_tx_chain(card, 0); if ((chain->head->next == chain->tail->prev) || (spider_net_prepare_tx_descr(card, skb) != 0)) { card->netdev_stats.tx_dropped++; netif_stop_queue(netdev); return NETDEV_TX_BUSY; } cnt = spider_net_set_low_watermark(card); if (cnt < 5) spider_net_kick_tx_dma(card); return NETDEV_TX_OK; } /** * spider_net_cleanup_tx_ring - cleans up the TX ring * @card: card structure * * spider_net_cleanup_tx_ring is called by either the tx_timer * or from the NAPI polling routine. * This routine releases resources associted with transmitted * packets, including updating the queue tail pointer. */ static void spider_net_cleanup_tx_ring(struct spider_net_card *card) { if ((spider_net_release_tx_chain(card, 0) != 0) && (card->netdev->flags & IFF_UP)) { spider_net_kick_tx_dma(card); netif_wake_queue(card->netdev); } } /** * spider_net_do_ioctl - called for device ioctls * @netdev: interface device structure * @ifr: request parameter structure for ioctl * @cmd: command code for ioctl * * returns 0 on success, <0 on failure. Currently, we have no special ioctls. * -EOPNOTSUPP is returned, if an unknown ioctl was requested */ static int spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) { switch (cmd) { default: return -EOPNOTSUPP; } } /** * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on * @descr: descriptor to process * @card: card structure * * Fills out skb structure and passes the data to the stack. * The descriptor state is not changed. */ static void spider_net_pass_skb_up(struct spider_net_descr *descr, struct spider_net_card *card) { struct sk_buff *skb; struct net_device *netdev; u32 data_status, data_error; data_status = descr->data_status; data_error = descr->data_error; netdev = card->netdev; skb = descr->skb; skb->dev = netdev; skb_put(skb, descr->valid_size); /* the card seems to add 2 bytes of junk in front * of the ethernet frame */ #define SPIDER_MISALIGN 2 skb_pull(skb, SPIDER_MISALIGN); skb->protocol = eth_type_trans(skb, netdev); /* checksum offload */ if (card->options.rx_csum) { if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) == SPIDER_NET_DATA_STATUS_CKSUM_MASK) && !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK)) skb->ip_summed = CHECKSUM_UNNECESSARY; else skb->ip_summed = CHECKSUM_NONE; } else skb->ip_summed = CHECKSUM_NONE; if (data_status & SPIDER_NET_VLAN_PACKET) { /* further enhancements: HW-accel VLAN * vlan_hwaccel_receive_skb */ } /* pass skb up to stack */ netif_receive_skb(skb); /* update netdevice statistics */ card->netdev_stats.rx_packets++; card->netdev_stats.rx_bytes += skb->len; } #ifdef DEBUG static void show_rx_chain(struct spider_net_card *card) { struct spider_net_descr_chain *chain = &card->rx_chain; struct spider_net_descr *start= chain->tail; struct spider_net_descr *descr= start; int status; int cnt = 0; int cstat = spider_net_get_descr_status(descr); printk(KERN_INFO "RX chain tail at descr=%ld\n", (start - card->descr) - card->tx_chain.num_desc); status = cstat; do { status = spider_net_get_descr_status(descr); if (cstat != status) { printk(KERN_INFO "Have %d descrs with stat=x%08x\n", cnt, cstat); cstat = status; cnt = 0; } cnt ++; descr = descr->next; } while (descr != start); printk(KERN_INFO "Last %d descrs with stat=x%08x\n", cnt, cstat); } #endif /** * spider_net_decode_one_descr - processes an rx descriptor * @card: card structure * * Returns 1 if a packet has been sent to the stack, otherwise 0 * * Processes an rx descriptor by iommu-unmapping the data buffer and passing * the packet up to the stack. This function is called in softirq * context, e.g. either bottom half from interrupt or NAPI polling context */ static int spider_net_decode_one_descr(struct spider_net_card *card) { struct spider_net_descr_chain *chain = &card->rx_chain; struct spider_net_descr *descr = chain->tail; int status; status = spider_net_get_descr_status(descr); /* Nothing in the descriptor, or ring must be empty */ if ((status == SPIDER_NET_DESCR_CARDOWNED) || (status == SPIDER_NET_DESCR_NOT_IN_USE)) return 0; /* descriptor definitively used -- move on tail */ chain->tail = descr->next; /* unmap descriptor */ pci_unmap_single(card->pdev, descr->buf_addr, SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) || (status == SPIDER_NET_DESCR_PROTECTION_ERROR) || (status == SPIDER_NET_DESCR_FORCE_END) ) { if (netif_msg_rx_err(card)) pr_err("%s: dropping RX descriptor with state %d\n", card->netdev->name, status); card->netdev_stats.rx_dropped++; goto bad_desc; } if ( (status != SPIDER_NET_DESCR_COMPLETE) && (status != SPIDER_NET_DESCR_FRAME_END) ) { if (netif_msg_rx_err(card)) pr_err("%s: RX descriptor with unkown state %d\n", card->netdev->name, status); card->spider_stats.rx_desc_unk_state++; goto bad_desc; } /* The cases we'll throw away the packet immediately */ if (descr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) { if (netif_msg_rx_err(card)) pr_err("%s: error in received descriptor found, " "data_status=x%08x, data_error=x%08x\n", card->netdev->name, descr->data_status, descr->data_error); goto bad_desc; } if (descr->dmac_cmd_status & 0xfefe) { pr_err("%s: bad status, cmd_status=x%08x\n", card->netdev->name, descr->dmac_cmd_status); pr_err("buf_addr=x%08x\n", descr->buf_addr); pr_err("buf_size=x%08x\n", descr->buf_size); pr_err("next_descr_addr=x%08x\n", descr->next_descr_addr); pr_err("result_size=x%08x\n", descr->result_size); pr_err("valid_size=x%08x\n", descr->valid_size); pr_err("data_status=x%08x\n", descr->data_status); pr_err("data_error=x%08x\n", descr->data_error); pr_err("bus_addr=x%08x\n", descr->bus_addr); pr_err("which=%ld\n", descr - card->rx_chain.ring); card->spider_stats.rx_desc_error++; goto bad_desc; } /* Ok, we've got a packet in descr */ spider_net_pass_skb_up(descr, card); descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; return 1; bad_desc: dev_kfree_skb_irq(descr->skb); descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; return 0; } /** * spider_net_poll - NAPI poll function called by the stack to return packets * @netdev: interface device structure * @budget: number of packets we can pass to the stack at most * * returns 0 if no more packets available to the driver/stack. Returns 1, * if the quota is exceeded, but the driver has still packets. * * spider_net_poll returns all packets from the rx descriptors to the stack * (using netif_receive_skb). If all/enough packets are up, the driver * reenables interrupts and returns 0. If not, 1 is returned. */ static int spider_net_poll(struct net_device *netdev, int *budget) { struct spider_net_card *card = netdev_priv(netdev); int packets_to_do, packets_done = 0; int no_more_packets = 0; spider_net_cleanup_tx_ring(card); packets_to_do = min(*budget, netdev->quota); while (packets_to_do) { if (spider_net_decode_one_descr(card)) { packets_done++; packets_to_do--; } else { /* no more packets for the stack */ no_more_packets = 1; break; } } netdev->quota -= packets_done; *budget -= packets_done; spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); /* if all packets are in the stack, enable interrupts and return 0 */ /* if not, return 1 */ if (no_more_packets) { netif_rx_complete(netdev); spider_net_rx_irq_on(card); return 0; } return 1; } /** * spider_net_vlan_rx_reg - initializes VLAN structures in the driver and card * @netdev: interface device structure * @grp: vlan_group structure that is registered (NULL on destroying interface) */ static void spider_net_vlan_rx_reg(struct net_device *netdev, struct vlan_group *grp) { /* further enhancement... yet to do */ return; } /** * spider_net_vlan_rx_add - adds VLAN id to the card filter * @netdev: interface device structure * @vid: VLAN id to add */ static void spider_net_vlan_rx_add(struct net_device *netdev, uint16_t vid) { /* further enhancement... yet to do */ /* add vid to card's VLAN filter table */ return; } /** * spider_net_vlan_rx_kill - removes VLAN id to the card filter * @netdev: interface device structure * @vid: VLAN id to remove */ static void spider_net_vlan_rx_kill(struct net_device *netdev, uint16_t vid) { /* further enhancement... yet to do */ /* remove vid from card's VLAN filter table */ } /** * spider_net_get_stats - get interface statistics * @netdev: interface device structure * * returns the interface statistics residing in the spider_net_card struct */ static struct net_device_stats * spider_net_get_stats(struct net_device *netdev) { struct spider_net_card *card = netdev_priv(netdev); struct net_device_stats *stats = &card->netdev_stats; return stats; } /** * spider_net_change_mtu - changes the MTU of an interface * @netdev: interface device structure * @new_mtu: new MTU value * * returns 0 on success, <0 on failure */ static int spider_net_change_mtu(struct net_device *netdev, int new_mtu) { /* no need to re-alloc skbs or so -- the max mtu is about 2.3k * and mtu is outbound only anyway */ if ( (new_mtu < SPIDER_NET_MIN_MTU ) || (new_mtu > SPIDER_NET_MAX_MTU) ) return -EINVAL; netdev->mtu = new_mtu; return 0; } /** * spider_net_set_mac - sets the MAC of an interface * @netdev: interface device structure * @ptr: pointer to new MAC address * * Returns 0 on success, <0 on failure. Currently, we don't support this * and will always return EOPNOTSUPP. */ static int spider_net_set_mac(struct net_device *netdev, void *p) { struct spider_net_card *card = netdev_priv(netdev); u32 macl, macu, regvalue; struct sockaddr *addr = p; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; /* switch off GMACTPE and GMACRPE */ regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); regvalue &= ~((1 << 5) | (1 << 6)); spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); /* write mac */ macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) + (addr->sa_data[2]<<8) + (addr->sa_data[3]); macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]); spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu); spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl); /* switch GMACTPE and GMACRPE back on */ regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); regvalue |= ((1 << 5) | (1 << 6)); spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); spider_net_set_promisc(card); /* look up, whether we have been successful */ if (spider_net_get_mac_address(netdev)) return -EADDRNOTAVAIL; if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len)) return -EADDRNOTAVAIL; return 0; } /** * spider_net_handle_error_irq - handles errors raised by an interrupt * @card: card structure * @status_reg: interrupt status register 0 (GHIINT0STS) * * spider_net_handle_error_irq treats or ignores all error conditions * found when an interrupt is presented */ static void spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg) { u32 error_reg1, error_reg2; u32 i; int show_error = 1; error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS); error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS); /* check GHIINT0STS ************************************/ if (status_reg) for (i = 0; i < 32; i++) if (status_reg & (1<<i)) switch (i) { /* let error_reg1 and error_reg2 evaluation decide, what to do case SPIDER_NET_PHYINT: case SPIDER_NET_GMAC2INT: case SPIDER_NET_GMAC1INT: case SPIDER_NET_GFIFOINT: case SPIDER_NET_DMACINT: case SPIDER_NET_GSYSINT: break; */ case SPIDER_NET_GIPSINT: show_error = 0; break; case SPIDER_NET_GPWOPCMPINT: /* PHY write operation completed */ show_error = 0; break; case SPIDER_NET_GPROPCMPINT: /* PHY read operation completed */ /* we don't use semaphores, as we poll for the completion * of the read operation in spider_net_read_phy. Should take * about 50 us */ show_error = 0; break; case SPIDER_NET_GPWFFINT: /* PHY command queue full */ if (netif_msg_intr(card)) pr_err("PHY write queue full\n"); show_error = 0; break; /* case SPIDER_NET_GRMDADRINT: not used. print a message */ /* case SPIDER_NET_GRMARPINT: not used. print a message */ /* case SPIDER_NET_GRMMPINT: not used. print a message */ case SPIDER_NET_GDTDEN0INT: /* someone has set TX_DMA_EN to 0 */ show_error = 0; break; case SPIDER_NET_GDDDEN0INT: /* fallthrough */ case SPIDER_NET_GDCDEN0INT: /* fallthrough */ case SPIDER_NET_GDBDEN0INT: /* fallthrough */ case SPIDER_NET_GDADEN0INT: /* someone has set RX_DMA_EN to 0 */ show_error = 0; break; /* RX interrupts */ case SPIDER_NET_GDDFDCINT: case SPIDER_NET_GDCFDCINT: case SPIDER_NET_GDBFDCINT: case SPIDER_NET_GDAFDCINT: /* case SPIDER_NET_GDNMINT: not used. print a message */ /* case SPIDER_NET_GCNMINT: not used. print a message */ /* case SPIDER_NET_GBNMINT: not used. print a message */ /* case SPIDER_NET_GANMINT: not used. print a message */ /* case SPIDER_NET_GRFNMINT: not used. print a message */ show_error = 0; break; /* TX interrupts */ case SPIDER_NET_GDTFDCINT: show_error = 0; break; case SPIDER_NET_GTTEDINT: show_error = 0; break; case SPIDER_NET_GDTDCEINT: /* chain end. If a descriptor should be sent, kick off * tx dma if (card->tx_chain.tail != card->tx_chain.head) spider_net_kick_tx_dma(card); */ show_error = 0; break; /* case SPIDER_NET_G1TMCNTINT: not used. print a message */ /* case SPIDER_NET_GFREECNTINT: not used. print a message */ } /* check GHIINT1STS ************************************/ if (error_reg1) for (i = 0; i < 32; i++) if (error_reg1 & (1<<i)) switch (i) { case SPIDER_NET_GTMFLLINT: if (netif_msg_intr(card) && net_ratelimit()) pr_err("Spider TX RAM full\n"); show_error = 0; break; case SPIDER_NET_GRFDFLLINT: /* fallthrough */ case SPIDER_NET_GRFCFLLINT: /* fallthrough */ case SPIDER_NET_GRFBFLLINT: /* fallthrough */ case SPIDER_NET_GRFAFLLINT: /* fallthrough */ case SPIDER_NET_GRMFLLINT: if (netif_msg_intr(card) && net_ratelimit()) pr_err("Spider RX RAM full, incoming packets " "might be discarded!\n"); spider_net_rx_irq_off(card); netif_rx_schedule(card->netdev); show_error = 0; break; /* case SPIDER_NET_GTMSHTINT: problem, print a message */ case SPIDER_NET_GDTINVDINT: /* allrighty. tx from previous descr ok */ show_error = 0; break; /* chain end */ case SPIDER_NET_GDDDCEINT: /* fallthrough */ case SPIDER_NET_GDCDCEINT: /* fallthrough */ case SPIDER_NET_GDBDCEINT: /* fallthrough */ case SPIDER_NET_GDADCEINT: if (netif_msg_intr(card) && net_ratelimit()) pr_err("got descriptor chain end interrupt, " "restarting DMAC %c.\n", 'D'-(i-SPIDER_NET_GDDDCEINT)/3); spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); show_error = 0; break; /* invalid descriptor */ case SPIDER_NET_GDDINVDINT: /* fallthrough */ case SPIDER_NET_GDCINVDINT: /* fallthrough */ case SPIDER_NET_GDBINVDINT: /* fallthrough */ case SPIDER_NET_GDAINVDINT: /* could happen when rx chain is full */ spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); show_error = 0; break; /* case SPIDER_NET_GDTRSERINT: problem, print a message */ /* case SPIDER_NET_GDDRSERINT: problem, print a message */ /* case SPIDER_NET_GDCRSERINT: problem, print a message */ /* case SPIDER_NET_GDBRSERINT: problem, print a message */ /* case SPIDER_NET_GDARSERINT: problem, print a message */ /* case SPIDER_NET_GDSERINT: problem, print a message */ /* case SPIDER_NET_GDTPTERINT: problem, print a message */ /* case SPIDER_NET_GDDPTERINT: problem, print a message */ /* case SPIDER_NET_GDCPTERINT: problem, print a message */ /* case SPIDER_NET_GDBPTERINT: problem, print a message */ /* case SPIDER_NET_GDAPTERINT: problem, print a message */ default: show_error = 1; break; } /* check GHIINT2STS ************************************/ if (error_reg2) for (i = 0; i < 32; i++) if (error_reg2 & (1<<i)) switch (i) { /* there is nothing we can (want to) do at this time. Log a * message, we can switch on and off the specific values later on case SPIDER_NET_GPROPERINT: case SPIDER_NET_GMCTCRSNGINT: case SPIDER_NET_GMCTLCOLINT: case SPIDER_NET_GMCTTMOTINT: case SPIDER_NET_GMCRCAERINT: case SPIDER_NET_GMCRCALERINT: case SPIDER_NET_GMCRALNERINT: case SPIDER_NET_GMCROVRINT: case SPIDER_NET_GMCRRNTINT: case SPIDER_NET_GMCRRXERINT: case SPIDER_NET_GTITCSERINT: case SPIDER_NET_GTIFMTERINT: case SPIDER_NET_GTIPKTRVKINT: case SPIDER_NET_GTISPINGINT: case SPIDER_NET_GTISADNGINT: case SPIDER_NET_GTISPDNGINT: case SPIDER_NET_GRIFMTERINT: case SPIDER_NET_GRIPKTRVKINT: case SPIDER_NET_GRISPINGINT: case SPIDER_NET_GRISADNGINT: case SPIDER_NET_GRISPDNGINT: break; */ default: break; } if ((show_error) && (netif_msg_intr(card)) && net_ratelimit()) pr_err("Got error interrupt on %s, GHIINT0STS = 0x%08x, " "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n", card->netdev->name, status_reg, error_reg1, error_reg2); /* clear interrupt sources */ spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1); spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2); } /** * spider_net_interrupt - interrupt handler for spider_net * @irq: interupt number * @ptr: pointer to net_device * @regs: PU registers * * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no * interrupt found raised by card. * * This is the interrupt handler, that turns off * interrupts for this device and makes the stack poll the driver */ static irqreturn_t spider_net_interrupt(int irq, void *ptr) { struct net_device *netdev = ptr; struct spider_net_card *card = netdev_priv(netdev); u32 status_reg; status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS); if (!status_reg) return IRQ_NONE; if (status_reg & SPIDER_NET_RXINT ) { spider_net_rx_irq_off(card); netif_rx_schedule(netdev); } if (status_reg & SPIDER_NET_TXINT) netif_rx_schedule(netdev); if (status_reg & SPIDER_NET_ERRINT ) spider_net_handle_error_irq(card, status_reg); /* clear interrupt sources */ spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg); return IRQ_HANDLED; } #ifdef CONFIG_NET_POLL_CONTROLLER /** * spider_net_poll_controller - artificial interrupt for netconsole etc. * @netdev: interface device structure * * see Documentation/networking/netconsole.txt */ static void spider_net_poll_controller(struct net_device *netdev) { disable_irq(netdev->irq); spider_net_interrupt(netdev->irq, netdev); enable_irq(netdev->irq); } #endif /* CONFIG_NET_POLL_CONTROLLER */ /** * spider_net_init_card - initializes the card * @card: card structure * * spider_net_init_card initializes the card so that other registers can * be used */ static void spider_net_init_card(struct spider_net_card *card) { spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_STOP_VALUE); spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_RUN_VALUE); } /** * spider_net_enable_card - enables the card by setting all kinds of regs * @card: card structure * * spider_net_enable_card sets a lot of SMMIO registers to enable the device */ static void spider_net_enable_card(struct spider_net_card *card) { int i; /* the following array consists of (register),(value) pairs * that are set in this function. A register of 0 ends the list */ u32 regs[][2] = { { SPIDER_NET_GRESUMINTNUM, 0 }, { SPIDER_NET_GREINTNUM, 0 }, /* set interrupt frame number registers */ /* clear the single DMA engine registers first */ { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, /* then set, what we really need */ { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE }, /* timer counter registers and stuff */ { SPIDER_NET_GFREECNNUM, 0 }, { SPIDER_NET_GONETIMENUM, 0 }, { SPIDER_NET_GTOUTFRMNUM, 0 }, /* RX mode setting */ { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE }, /* TX mode setting */ { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE }, /* IPSEC mode setting */ { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE }, { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE }, { SPIDER_NET_GMRWOLCTRL, 0 }, { SPIDER_NET_GTESTMD, 0x10000000 }, { SPIDER_NET_GTTQMSK, 0x00400040 }, { SPIDER_NET_GMACINTEN, 0 }, /* flow control stuff */ { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE }, { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE }, { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE }, { 0, 0} }; i = 0; while (regs[i][0]) { spider_net_write_reg(card, regs[i][0], regs[i][1]); i++; } /* clear unicast filter table entries 1 to 14 */ for (i = 1; i <= 14; i++) { spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + i * 8, 0x00080000); spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + i * 8 + 4, 0x00000000); } spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000); spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE); /* set chain tail adress for RX chains and * enable DMA */ spider_net_enable_rxchtails(card); spider_net_enable_rxdmac(card); spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE); spider_net_write_reg(card, SPIDER_NET_GMACLENLMT, SPIDER_NET_LENLMT_VALUE); spider_net_write_reg(card, SPIDER_NET_GMACMODE, SPIDER_NET_MACMODE_VALUE); spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, SPIDER_NET_OPMODE_VALUE); /* set interrupt mask registers */ spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, SPIDER_NET_INT0_MASK_VALUE); spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, SPIDER_NET_INT1_MASK_VALUE); spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, SPIDER_NET_INT2_MASK_VALUE); spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, SPIDER_NET_GDTBSTA); } /** * spider_net_open - called upon ifonfig up * @netdev: interface device structure * * returns 0 on success, <0 on failure * * spider_net_open allocates all the descriptors and memory needed for * operation, sets up multicast list and enables interrupts */ int spider_net_open(struct net_device *netdev) { struct spider_net_card *card = netdev_priv(netdev); int result; result = spider_net_init_chain(card, &card->tx_chain); if (result) goto alloc_tx_failed; card->low_watermark = NULL; result = spider_net_init_chain(card, &card->rx_chain); if (result) goto alloc_rx_failed; /* Allocate rx skbs */ if (spider_net_alloc_rx_skbs(card)) goto alloc_skbs_failed; spider_net_set_multi(netdev); /* further enhancement: setup hw vlan, if needed */ result = -EBUSY; if (request_irq(netdev->irq, spider_net_interrupt, IRQF_SHARED, netdev->name, netdev)) goto register_int_failed; spider_net_enable_card(card); netif_start_queue(netdev); netif_carrier_on(netdev); netif_poll_enable(netdev); return 0; register_int_failed: spider_net_free_rx_chain_contents(card); alloc_skbs_failed: spider_net_free_chain(card, &card->rx_chain); alloc_rx_failed: spider_net_free_chain(card, &card->tx_chain); alloc_tx_failed: return result; } /** * spider_net_setup_phy - setup PHY * @card: card structure * * returns 0 on success, <0 on failure * * spider_net_setup_phy is used as part of spider_net_probe. Sets * the PHY to 1000 Mbps **/ static int spider_net_setup_phy(struct spider_net_card *card) { struct mii_phy *phy = &card->phy; spider_net_write_reg(card, SPIDER_NET_GDTDMASEL, SPIDER_NET_DMASEL_VALUE); spider_net_write_reg(card, SPIDER_NET_GPCCTRL, SPIDER_NET_PHY_CTRL_VALUE); phy->mii_id = 1; phy->dev = card->netdev; phy->mdio_read = spider_net_read_phy; phy->mdio_write = spider_net_write_phy; mii_phy_probe(phy, phy->mii_id); if (phy->def->ops->setup_forced) phy->def->ops->setup_forced(phy, SPEED_1000, DUPLEX_FULL); phy->def->ops->enable_fiber(phy); phy->def->ops->read_link(phy); pr_info("Found %s with %i Mbps, %s-duplex.\n", phy->def->name, phy->speed, phy->duplex==1 ? "Full" : "Half"); return 0; } /** * spider_net_download_firmware - loads firmware into the adapter * @card: card structure * @firmware_ptr: pointer to firmware data * * spider_net_download_firmware loads the firmware data into the * adapter. It assumes the length etc. to be allright. */ static int spider_net_download_firmware(struct spider_net_card *card, const void *firmware_ptr) { int sequencer, i; const u32 *fw_ptr = firmware_ptr; /* stop sequencers */ spider_net_write_reg(card, SPIDER_NET_GSINIT, SPIDER_NET_STOP_SEQ_VALUE); for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; sequencer++) { spider_net_write_reg(card, SPIDER_NET_GSnPRGADR + sequencer * 8, 0); for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + sequencer * 8, *fw_ptr); fw_ptr++; } } if (spider_net_read_reg(card, SPIDER_NET_GSINIT)) return -EIO; spider_net_write_reg(card, SPIDER_NET_GSINIT, SPIDER_NET_RUN_SEQ_VALUE); return 0; } /** * spider_net_init_firmware - reads in firmware parts * @card: card structure * * Returns 0 on success, <0 on failure * * spider_net_init_firmware opens the sequencer firmware and does some basic * checks. This function opens and releases the firmware structure. A call * to download the firmware is performed before the release. * * Firmware format * =============== * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being * the program for each sequencer. Use the command * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \ * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \ * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin * * to generate spider_fw.bin, if you have sequencer programs with something * like the following contents for each sequencer: * <ONE LINE COMMENT> * <FIRST 4-BYTES-WORD FOR SEQUENCER> * <SECOND 4-BYTES-WORD FOR SEQUENCER> * ... * <1024th 4-BYTES-WORD FOR SEQUENCER> */ static int spider_net_init_firmware(struct spider_net_card *card) { struct firmware *firmware = NULL; struct device_node *dn; const u8 *fw_prop = NULL; int err = -ENOENT; int fw_size; if (request_firmware((const struct firmware **)&firmware, SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) { if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) && netif_msg_probe(card) ) { pr_err("Incorrect size of spidernet firmware in " \ "filesystem. Looking in host firmware...\n"); goto try_host_fw; } err = spider_net_download_firmware(card, firmware->data); release_firmware(firmware); if (err) goto try_host_fw; goto done; } try_host_fw: dn = pci_device_to_OF_node(card->pdev); if (!dn) goto out_err; fw_prop = get_property(dn, "firmware", &fw_size); if (!fw_prop) goto out_err; if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) && netif_msg_probe(card) ) { pr_err("Incorrect size of spidernet firmware in " \ "host firmware\n"); goto done; } err = spider_net_download_firmware(card, fw_prop); done: return err; out_err: if (netif_msg_probe(card)) pr_err("Couldn't find spidernet firmware in filesystem " \ "or host firmware\n"); return err; } /** * spider_net_workaround_rxramfull - work around firmware bug * @card: card structure * * no return value **/ static void spider_net_workaround_rxramfull(struct spider_net_card *card) { int i, sequencer = 0; /* cancel reset */ spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_RUN_VALUE); /* empty sequencer data */ for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; sequencer++) { spider_net_write_reg(card, SPIDER_NET_GSnPRGADR + sequencer * 8, 0x0); for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + sequencer * 8, 0x0); } } /* set sequencer operation */ spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe); /* reset */ spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_STOP_VALUE); } /** * spider_net_stop - called upon ifconfig down * @netdev: interface device structure * * always returns 0 */ int spider_net_stop(struct net_device *netdev) { struct spider_net_card *card = netdev_priv(netdev); netif_poll_disable(netdev); netif_carrier_off(netdev); netif_stop_queue(netdev); del_timer_sync(&card->tx_timer); /* disable/mask all interrupts */ spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0); spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0); spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0); free_irq(netdev->irq, netdev); spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, SPIDER_NET_DMA_TX_FEND_VALUE); /* turn off DMA, force end */ spider_net_disable_rxdmac(card); /* release chains */ spider_net_release_tx_chain(card, 1); spider_net_free_rx_chain_contents(card); spider_net_free_chain(card, &card->tx_chain); spider_net_free_chain(card, &card->rx_chain); return 0; } /** * spider_net_tx_timeout_task - task scheduled by the watchdog timeout * function (to be called not under interrupt status) * @data: data, is interface device structure * * called as task when tx hangs, resets interface (if interface is up) */ static void spider_net_tx_timeout_task(struct work_struct *work) { struct spider_net_card *card = container_of(work, struct spider_net_card, tx_timeout_task); struct net_device *netdev = card->netdev; if (!(netdev->flags & IFF_UP)) goto out; netif_device_detach(netdev); spider_net_stop(netdev); spider_net_workaround_rxramfull(card); spider_net_init_card(card); if (spider_net_setup_phy(card)) goto out; if (spider_net_init_firmware(card)) goto out; spider_net_open(netdev); spider_net_kick_tx_dma(card); netif_device_attach(netdev); out: atomic_dec(&card->tx_timeout_task_counter); } /** * spider_net_tx_timeout - called when the tx timeout watchdog kicks in. * @netdev: interface device structure * * called, if tx hangs. Schedules a task that resets the interface */ static void spider_net_tx_timeout(struct net_device *netdev) { struct spider_net_card *card; card = netdev_priv(netdev); atomic_inc(&card->tx_timeout_task_counter); if (netdev->flags & IFF_UP) schedule_work(&card->tx_timeout_task); else atomic_dec(&card->tx_timeout_task_counter); card->spider_stats.tx_timeouts++; } /** * spider_net_setup_netdev_ops - initialization of net_device operations * @netdev: net_device structure * * fills out function pointers in the net_device structure */ static void spider_net_setup_netdev_ops(struct net_device *netdev) { netdev->open = &spider_net_open; netdev->stop = &spider_net_stop; netdev->hard_start_xmit = &spider_net_xmit; netdev->get_stats = &spider_net_get_stats; netdev->set_multicast_list = &spider_net_set_multi; netdev->set_mac_address = &spider_net_set_mac; netdev->change_mtu = &spider_net_change_mtu; netdev->do_ioctl = &spider_net_do_ioctl; /* tx watchdog */ netdev->tx_timeout = &spider_net_tx_timeout; netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT; /* NAPI */ netdev->poll = &spider_net_poll; netdev->weight = SPIDER_NET_NAPI_WEIGHT; /* HW VLAN */ netdev->vlan_rx_register = &spider_net_vlan_rx_reg; netdev->vlan_rx_add_vid = &spider_net_vlan_rx_add; netdev->vlan_rx_kill_vid = &spider_net_vlan_rx_kill; #ifdef CONFIG_NET_POLL_CONTROLLER /* poll controller */ netdev->poll_controller = &spider_net_poll_controller; #endif /* CONFIG_NET_POLL_CONTROLLER */ /* ethtool ops */ netdev->ethtool_ops = &spider_net_ethtool_ops; } /** * spider_net_setup_netdev - initialization of net_device * @card: card structure * * Returns 0 on success or <0 on failure * * spider_net_setup_netdev initializes the net_device structure **/ static int spider_net_setup_netdev(struct spider_net_card *card) { int result; struct net_device *netdev = card->netdev; struct device_node *dn; struct sockaddr addr; const u8 *mac; SET_MODULE_OWNER(netdev); SET_NETDEV_DEV(netdev, &card->pdev->dev); pci_set_drvdata(card->pdev, netdev); init_timer(&card->tx_timer); card->tx_timer.function = (void (*)(unsigned long)) spider_net_cleanup_tx_ring; card->tx_timer.data = (unsigned long) card; netdev->irq = card->pdev->irq; card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT; card->tx_chain.num_desc = tx_descriptors; card->rx_chain.num_desc = rx_descriptors; spider_net_setup_netdev_ops(netdev); netdev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX; /* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX | * NETIF_F_HW_VLAN_FILTER */ netdev->irq = card->pdev->irq; dn = pci_device_to_OF_node(card->pdev); if (!dn) return -EIO; mac = get_property(dn, "local-mac-address", NULL); if (!mac) return -EIO; memcpy(addr.sa_data, mac, ETH_ALEN); result = spider_net_set_mac(netdev, &addr); if ((result) && (netif_msg_probe(card))) pr_err("Failed to set MAC address: %i\n", result); result = register_netdev(netdev); if (result) { if (netif_msg_probe(card)) pr_err("Couldn't register net_device: %i\n", result); return result; } if (netif_msg_probe(card)) pr_info("Initialized device %s.\n", netdev->name); return 0; } /** * spider_net_alloc_card - allocates net_device and card structure * * returns the card structure or NULL in case of errors * * the card and net_device structures are linked to each other */ static struct spider_net_card * spider_net_alloc_card(void) { struct net_device *netdev; struct spider_net_card *card; netdev = alloc_etherdev(sizeof(struct spider_net_card)); if (!netdev) return NULL; card = netdev_priv(netdev); card->netdev = netdev; card->msg_enable = SPIDER_NET_DEFAULT_MSG; INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task); init_waitqueue_head(&card->waitq); atomic_set(&card->tx_timeout_task_counter, 0); return card; } /** * spider_net_undo_pci_setup - releases PCI ressources * @card: card structure * * spider_net_undo_pci_setup releases the mapped regions */ static void spider_net_undo_pci_setup(struct spider_net_card *card) { iounmap(card->regs); pci_release_regions(card->pdev); } /** * spider_net_setup_pci_dev - sets up the device in terms of PCI operations * @card: card structure * @pdev: PCI device * * Returns the card structure or NULL if any errors occur * * spider_net_setup_pci_dev initializes pdev and together with the * functions called in spider_net_open configures the device so that * data can be transferred over it * The net_device structure is attached to the card structure, if the * function returns without error. **/ static struct spider_net_card * spider_net_setup_pci_dev(struct pci_dev *pdev) { struct spider_net_card *card; unsigned long mmio_start, mmio_len; if (pci_enable_device(pdev)) { pr_err("Couldn't enable PCI device\n"); return NULL; } if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { pr_err("Couldn't find proper PCI device base address.\n"); goto out_disable_dev; } if (pci_request_regions(pdev, spider_net_driver_name)) { pr_err("Couldn't obtain PCI resources, aborting.\n"); goto out_disable_dev; } pci_set_master(pdev); card = spider_net_alloc_card(); if (!card) { pr_err("Couldn't allocate net_device structure, " "aborting.\n"); goto out_release_regions; } card->pdev = pdev; /* fetch base address and length of first resource */ mmio_start = pci_resource_start(pdev, 0); mmio_len = pci_resource_len(pdev, 0); card->netdev->mem_start = mmio_start; card->netdev->mem_end = mmio_start + mmio_len; card->regs = ioremap(mmio_start, mmio_len); if (!card->regs) { pr_err("Couldn't obtain PCI resources, aborting.\n"); goto out_release_regions; } return card; out_release_regions: pci_release_regions(pdev); out_disable_dev: pci_disable_device(pdev); pci_set_drvdata(pdev, NULL); return NULL; } /** * spider_net_probe - initialization of a device * @pdev: PCI device * @ent: entry in the device id list * * Returns 0 on success, <0 on failure * * spider_net_probe initializes pdev and registers a net_device * structure for it. After that, the device can be ifconfig'ed up **/ static int __devinit spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { int err = -EIO; struct spider_net_card *card; card = spider_net_setup_pci_dev(pdev); if (!card) goto out; spider_net_workaround_rxramfull(card); spider_net_init_card(card); err = spider_net_setup_phy(card); if (err) goto out_undo_pci; err = spider_net_init_firmware(card); if (err) goto out_undo_pci; err = spider_net_setup_netdev(card); if (err) goto out_undo_pci; return 0; out_undo_pci: spider_net_undo_pci_setup(card); free_netdev(card->netdev); out: return err; } /** * spider_net_remove - removal of a device * @pdev: PCI device * * Returns 0 on success, <0 on failure * * spider_net_remove is called to remove the device and unregisters the * net_device **/ static void __devexit spider_net_remove(struct pci_dev *pdev) { struct net_device *netdev; struct spider_net_card *card; netdev = pci_get_drvdata(pdev); card = netdev_priv(netdev); wait_event(card->waitq, atomic_read(&card->tx_timeout_task_counter) == 0); unregister_netdev(netdev); /* switch off card */ spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_STOP_VALUE); spider_net_write_reg(card, SPIDER_NET_CKRCTRL, SPIDER_NET_CKRCTRL_RUN_VALUE); spider_net_undo_pci_setup(card); free_netdev(netdev); } static struct pci_driver spider_net_driver = { .name = spider_net_driver_name, .id_table = spider_net_pci_tbl, .probe = spider_net_probe, .remove = __devexit_p(spider_net_remove) }; /** * spider_net_init - init function when the driver is loaded * * spider_net_init registers the device driver */ static int __init spider_net_init(void) { printk(KERN_INFO "Spidernet version %s.\n", VERSION); if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) { rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN; pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); } if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) { rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX; pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); } if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) { tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN; pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); } if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) { tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX; pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); } return pci_register_driver(&spider_net_driver); } /** * spider_net_cleanup - exit function when driver is unloaded * * spider_net_cleanup unregisters the device driver */ static void __exit spider_net_cleanup(void) { pci_unregister_driver(&spider_net_driver); } module_init(spider_net_init); module_exit(spider_net_cleanup);