diff options
Diffstat (limited to 'drivers/net/ioc3-eth.c')
| -rw-r--r-- | drivers/net/ioc3-eth.c | 1653 |
1 files changed, 1653 insertions, 0 deletions
diff --git a/drivers/net/ioc3-eth.c b/drivers/net/ioc3-eth.c new file mode 100644 index 0000000..d520b59 --- /dev/null +++ b/drivers/net/ioc3-eth.c @@ -0,0 +1,1653 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Driver for SGI's IOC3 based Ethernet cards as found in the PCI card. + * + * Copyright (C) 1999, 2000, 2001, 2003 Ralf Baechle + * Copyright (C) 1995, 1999, 2000, 2001 by Silicon Graphics, Inc. + * + * References: + * o IOC3 ASIC specification 4.51, 1996-04-18 + * o IEEE 802.3 specification, 2000 edition + * o DP38840A Specification, National Semiconductor, March 1997 + * + * To do: + * + * o Handle allocation failures in ioc3_alloc_skb() more gracefully. + * o Handle allocation failures in ioc3_init_rings(). + * o Use prefetching for large packets. What is a good lower limit for + * prefetching? + * o We're probably allocating a bit too much memory. + * o Use hardware checksums. + * o Convert to using a IOC3 meta driver. + * o Which PHYs might possibly be attached to the IOC3 in real live, + * which workarounds are required for them? Do we ever have Lucent's? + * o For the 2.5 branch kill the mii-tool ioctls. + */ + +#define IOC3_NAME "ioc3-eth" +#define IOC3_VERSION "2.6.3-3" + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/crc32.h> +#include <linux/mii.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/tcp.h> +#include <linux/udp.h> + +#ifdef CONFIG_SERIAL_8250 +#include <linux/serial.h> +#include <asm/serial.h> +#define IOC3_BAUD (22000000 / (3*16)) +#define IOC3_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) +#endif + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/skbuff.h> +#include <net/ip.h> + +#include <asm/byteorder.h> +#include <asm/checksum.h> +#include <asm/io.h> +#include <asm/pgtable.h> +#include <asm/uaccess.h> +#include <asm/sn/types.h> +#include <asm/sn/sn0/addrs.h> +#include <asm/sn/sn0/hubni.h> +#include <asm/sn/sn0/hubio.h> +#include <asm/sn/klconfig.h> +#include <asm/sn/ioc3.h> +#include <asm/sn/sn0/ip27.h> +#include <asm/pci/bridge.h> + +/* + * 64 RX buffers. This is tunable in the range of 16 <= x < 512. The + * value must be a power of two. + */ +#define RX_BUFFS 64 + +#define ETCSR_FD ((17<<ETCSR_IPGR2_SHIFT) | (11<<ETCSR_IPGR1_SHIFT) | 21) +#define ETCSR_HD ((21<<ETCSR_IPGR2_SHIFT) | (21<<ETCSR_IPGR1_SHIFT) | 21) + +/* Private per NIC data of the driver. */ +struct ioc3_private { + struct ioc3 *regs; + unsigned long *rxr; /* pointer to receiver ring */ + struct ioc3_etxd *txr; + struct sk_buff *rx_skbs[512]; + struct sk_buff *tx_skbs[128]; + struct net_device_stats stats; + int rx_ci; /* RX consumer index */ + int rx_pi; /* RX producer index */ + int tx_ci; /* TX consumer index */ + int tx_pi; /* TX producer index */ + int txqlen; + u32 emcr, ehar_h, ehar_l; + spinlock_t ioc3_lock; + struct mii_if_info mii; + struct pci_dev *pdev; + + /* Members used by autonegotiation */ + struct timer_list ioc3_timer; +}; + +static inline struct net_device *priv_netdev(struct ioc3_private *dev) +{ + return (void *)dev - ((sizeof(struct net_device) + 31) & ~31); +} + +static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); +static void ioc3_set_multicast_list(struct net_device *dev); +static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev); +static void ioc3_timeout(struct net_device *dev); +static inline unsigned int ioc3_hash(const unsigned char *addr); +static inline void ioc3_stop(struct ioc3_private *ip); +static void ioc3_init(struct net_device *dev); + +static const char ioc3_str[] = "IOC3 Ethernet"; +static struct ethtool_ops ioc3_ethtool_ops; + +/* We use this to acquire receive skb's that we can DMA directly into. */ + +#define IOC3_CACHELINE 128UL + +static inline unsigned long aligned_rx_skb_addr(unsigned long addr) +{ + return (~addr + 1) & (IOC3_CACHELINE - 1UL); +} + +static inline struct sk_buff * ioc3_alloc_skb(unsigned long length, + unsigned int gfp_mask) +{ + struct sk_buff *skb; + + skb = alloc_skb(length + IOC3_CACHELINE - 1, gfp_mask); + if (likely(skb)) { + int offset = aligned_rx_skb_addr((unsigned long) skb->data); + if (offset) + skb_reserve(skb, offset); + } + + return skb; +} + +static inline unsigned long ioc3_map(void *ptr, unsigned long vdev) +{ +#ifdef CONFIG_SGI_IP27 + vdev <<= 58; /* Shift to PCI64_ATTR_VIRTUAL */ + + return vdev | (0xaUL << PCI64_ATTR_TARG_SHFT) | PCI64_ATTR_PREF | + ((unsigned long)ptr & TO_PHYS_MASK); +#else + return virt_to_bus(ptr); +#endif +} + +/* BEWARE: The IOC3 documentation documents the size of rx buffers as + 1644 while it's actually 1664. This one was nasty to track down ... */ +#define RX_OFFSET 10 +#define RX_BUF_ALLOC_SIZE (1664 + RX_OFFSET + IOC3_CACHELINE) + +/* DMA barrier to separate cached and uncached accesses. */ +#define BARRIER() \ + __asm__("sync" ::: "memory") + + +#define IOC3_SIZE 0x100000 + +/* + * IOC3 is a big endian device + * + * Unorthodox but makes the users of these macros more readable - the pointer + * to the IOC3's memory mapped registers is expected as struct ioc3 * ioc3 + * in the environment. + */ +#define ioc3_r_mcr() be32_to_cpu(ioc3->mcr) +#define ioc3_w_mcr(v) do { ioc3->mcr = cpu_to_be32(v); } while (0) +#define ioc3_w_gpcr_s(v) do { ioc3->gpcr_s = cpu_to_be32(v); } while (0) +#define ioc3_r_emcr() be32_to_cpu(ioc3->emcr) +#define ioc3_w_emcr(v) do { ioc3->emcr = cpu_to_be32(v); } while (0) +#define ioc3_r_eisr() be32_to_cpu(ioc3->eisr) +#define ioc3_w_eisr(v) do { ioc3->eisr = cpu_to_be32(v); } while (0) +#define ioc3_r_eier() be32_to_cpu(ioc3->eier) +#define ioc3_w_eier(v) do { ioc3->eier = cpu_to_be32(v); } while (0) +#define ioc3_r_ercsr() be32_to_cpu(ioc3->ercsr) +#define ioc3_w_ercsr(v) do { ioc3->ercsr = cpu_to_be32(v); } while (0) +#define ioc3_r_erbr_h() be32_to_cpu(ioc3->erbr_h) +#define ioc3_w_erbr_h(v) do { ioc3->erbr_h = cpu_to_be32(v); } while (0) +#define ioc3_r_erbr_l() be32_to_cpu(ioc3->erbr_l) +#define ioc3_w_erbr_l(v) do { ioc3->erbr_l = cpu_to_be32(v); } while (0) +#define ioc3_r_erbar() be32_to_cpu(ioc3->erbar) +#define ioc3_w_erbar(v) do { ioc3->erbar = cpu_to_be32(v); } while (0) +#define ioc3_r_ercir() be32_to_cpu(ioc3->ercir) +#define ioc3_w_ercir(v) do { ioc3->ercir = cpu_to_be32(v); } while (0) +#define ioc3_r_erpir() be32_to_cpu(ioc3->erpir) +#define ioc3_w_erpir(v) do { ioc3->erpir = cpu_to_be32(v); } while (0) +#define ioc3_r_ertr() be32_to_cpu(ioc3->ertr) +#define ioc3_w_ertr(v) do { ioc3->ertr = cpu_to_be32(v); } while (0) +#define ioc3_r_etcsr() be32_to_cpu(ioc3->etcsr) +#define ioc3_w_etcsr(v) do { ioc3->etcsr = cpu_to_be32(v); } while (0) +#define ioc3_r_ersr() be32_to_cpu(ioc3->ersr) +#define ioc3_w_ersr(v) do { ioc3->ersr = cpu_to_be32(v); } while (0) +#define ioc3_r_etcdc() be32_to_cpu(ioc3->etcdc) +#define ioc3_w_etcdc(v) do { ioc3->etcdc = cpu_to_be32(v); } while (0) +#define ioc3_r_ebir() be32_to_cpu(ioc3->ebir) +#define ioc3_w_ebir(v) do { ioc3->ebir = cpu_to_be32(v); } while (0) +#define ioc3_r_etbr_h() be32_to_cpu(ioc3->etbr_h) +#define ioc3_w_etbr_h(v) do { ioc3->etbr_h = cpu_to_be32(v); } while (0) +#define ioc3_r_etbr_l() be32_to_cpu(ioc3->etbr_l) +#define ioc3_w_etbr_l(v) do { ioc3->etbr_l = cpu_to_be32(v); } while (0) +#define ioc3_r_etcir() be32_to_cpu(ioc3->etcir) +#define ioc3_w_etcir(v) do { ioc3->etcir = cpu_to_be32(v); } while (0) +#define ioc3_r_etpir() be32_to_cpu(ioc3->etpir) +#define ioc3_w_etpir(v) do { ioc3->etpir = cpu_to_be32(v); } while (0) +#define ioc3_r_emar_h() be32_to_cpu(ioc3->emar_h) +#define ioc3_w_emar_h(v) do { ioc3->emar_h = cpu_to_be32(v); } while (0) +#define ioc3_r_emar_l() be32_to_cpu(ioc3->emar_l) +#define ioc3_w_emar_l(v) do { ioc3->emar_l = cpu_to_be32(v); } while (0) +#define ioc3_r_ehar_h() be32_to_cpu(ioc3->ehar_h) +#define ioc3_w_ehar_h(v) do { ioc3->ehar_h = cpu_to_be32(v); } while (0) +#define ioc3_r_ehar_l() be32_to_cpu(ioc3->ehar_l) +#define ioc3_w_ehar_l(v) do { ioc3->ehar_l = cpu_to_be32(v); } while (0) +#define ioc3_r_micr() be32_to_cpu(ioc3->micr) +#define ioc3_w_micr(v) do { ioc3->micr = cpu_to_be32(v); } while (0) +#define ioc3_r_midr_r() be32_to_cpu(ioc3->midr_r) +#define ioc3_w_midr_r(v) do { ioc3->midr_r = cpu_to_be32(v); } while (0) +#define ioc3_r_midr_w() be32_to_cpu(ioc3->midr_w) +#define ioc3_w_midr_w(v) do { ioc3->midr_w = cpu_to_be32(v); } while (0) + +static inline u32 mcr_pack(u32 pulse, u32 sample) +{ + return (pulse << 10) | (sample << 2); +} + +static int nic_wait(struct ioc3 *ioc3) +{ + u32 mcr; + + do { + mcr = ioc3_r_mcr(); + } while (!(mcr & 2)); + + return mcr & 1; +} + +static int nic_reset(struct ioc3 *ioc3) +{ + int presence; + + ioc3_w_mcr(mcr_pack(500, 65)); + presence = nic_wait(ioc3); + + ioc3_w_mcr(mcr_pack(0, 500)); + nic_wait(ioc3); + + return presence; +} + +static inline int nic_read_bit(struct ioc3 *ioc3) +{ + int result; + + ioc3_w_mcr(mcr_pack(6, 13)); + result = nic_wait(ioc3); + ioc3_w_mcr(mcr_pack(0, 100)); + nic_wait(ioc3); + + return result; +} + +static inline void nic_write_bit(struct ioc3 *ioc3, int bit) +{ + if (bit) + ioc3_w_mcr(mcr_pack(6, 110)); + else + ioc3_w_mcr(mcr_pack(80, 30)); + + nic_wait(ioc3); +} + +/* + * Read a byte from an iButton device + */ +static u32 nic_read_byte(struct ioc3 *ioc3) +{ + u32 result = 0; + int i; + + for (i = 0; i < 8; i++) + result = (result >> 1) | (nic_read_bit(ioc3) << 7); + + return result; +} + +/* + * Write a byte to an iButton device + */ +static void nic_write_byte(struct ioc3 *ioc3, int byte) +{ + int i, bit; + + for (i = 8; i; i--) { + bit = byte & 1; + byte >>= 1; + + nic_write_bit(ioc3, bit); + } +} + +static u64 nic_find(struct ioc3 *ioc3, int *last) +{ + int a, b, index, disc; + u64 address = 0; + + nic_reset(ioc3); + /* Search ROM. */ + nic_write_byte(ioc3, 0xf0); + + /* Algorithm from ``Book of iButton Standards''. */ + for (index = 0, disc = 0; index < 64; index++) { + a = nic_read_bit(ioc3); + b = nic_read_bit(ioc3); + + if (a && b) { + printk("NIC search failed (not fatal).\n"); + *last = 0; + return 0; + } + + if (!a && !b) { + if (index == *last) { + address |= 1UL << index; + } else if (index > *last) { + address &= ~(1UL << index); + disc = index; + } else if ((address & (1UL << index)) == 0) + disc = index; + nic_write_bit(ioc3, address & (1UL << index)); + continue; + } else { + if (a) + address |= 1UL << index; + else + address &= ~(1UL << index); + nic_write_bit(ioc3, a); + continue; + } + } + + *last = disc; + + return address; +} + +static int nic_init(struct ioc3 *ioc3) +{ + const char *type; + u8 crc; + u8 serial[6]; + int save = 0, i; + + type = "unknown"; + + while (1) { + u64 reg; + reg = nic_find(ioc3, &save); + + switch (reg & 0xff) { + case 0x91: + type = "DS1981U"; + break; + default: + if (save == 0) { + /* Let the caller try again. */ + return -1; + } + continue; + } + + nic_reset(ioc3); + + /* Match ROM. */ + nic_write_byte(ioc3, 0x55); + for (i = 0; i < 8; i++) + nic_write_byte(ioc3, (reg >> (i << 3)) & 0xff); + + reg >>= 8; /* Shift out type. */ + for (i = 0; i < 6; i++) { + serial[i] = reg & 0xff; + reg >>= 8; + } + crc = reg & 0xff; + break; + } + + printk("Found %s NIC", type); + if (type != "unknown") { + printk (" registration number %02x:%02x:%02x:%02x:%02x:%02x," + " CRC %02x", serial[0], serial[1], serial[2], + serial[3], serial[4], serial[5], crc); + } + printk(".\n"); + + return 0; +} + +/* + * Read the NIC (Number-In-a-Can) device used to store the MAC address on + * SN0 / SN00 nodeboards and PCI cards. + */ +static void ioc3_get_eaddr_nic(struct ioc3_private *ip) +{ + struct ioc3 *ioc3 = ip->regs; + u8 nic[14]; + int tries = 2; /* There may be some problem with the battery? */ + int i; + + ioc3_w_gpcr_s(1 << 21); + + while (tries--) { + if (!nic_init(ioc3)) + break; + udelay(500); + } + + if (tries < 0) { + printk("Failed to read MAC address\n"); + return; + } + + /* Read Memory. */ + nic_write_byte(ioc3, 0xf0); + nic_write_byte(ioc3, 0x00); + nic_write_byte(ioc3, 0x00); + + for (i = 13; i >= 0; i--) + nic[i] = nic_read_byte(ioc3); + + for (i = 2; i < 8; i++) + priv_netdev(ip)->dev_addr[i - 2] = nic[i]; +} + +/* + * Ok, this is hosed by design. It's necessary to know what machine the + * NIC is in in order to know how to read the NIC address. We also have + * to know if it's a PCI card or a NIC in on the node board ... + */ +static void ioc3_get_eaddr(struct ioc3_private *ip) +{ + int i; + + + ioc3_get_eaddr_nic(ip); + + printk("Ethernet address is "); + for (i = 0; i < 6; i++) { + printk("%02x", priv_netdev(ip)->dev_addr[i]); + if (i < 5) + printk(":"); + } + printk(".\n"); +} + +static void __ioc3_set_mac_address(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + ioc3_w_emar_h((dev->dev_addr[5] << 8) | dev->dev_addr[4]); + ioc3_w_emar_l((dev->dev_addr[3] << 24) | (dev->dev_addr[2] << 16) | + (dev->dev_addr[1] << 8) | dev->dev_addr[0]); +} + +static int ioc3_set_mac_address(struct net_device *dev, void *addr) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct sockaddr *sa = addr; + + memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); + + spin_lock_irq(&ip->ioc3_lock); + __ioc3_set_mac_address(dev); + spin_unlock_irq(&ip->ioc3_lock); + + return 0; +} + +/* + * Caller must hold the ioc3_lock ever for MII readers. This is also + * used to protect the transmitter side but it's low contention. + */ +static int ioc3_mdio_read(struct net_device *dev, int phy, int reg) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + while (ioc3_r_micr() & MICR_BUSY); + ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg | MICR_READTRIG); + while (ioc3_r_micr() & MICR_BUSY); + + return ioc3_r_micr() & MIDR_DATA_MASK; +} + +static void ioc3_mdio_write(struct net_device *dev, int phy, int reg, int data) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + while (ioc3_r_micr() & MICR_BUSY); + ioc3_w_midr_w(data); + ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg); + while (ioc3_r_micr() & MICR_BUSY); +} + +static int ioc3_mii_init(struct ioc3_private *ip); + +static struct net_device_stats *ioc3_get_stats(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + ip->stats.collisions += (ioc3_r_etcdc() & ETCDC_COLLCNT_MASK); + return &ip->stats; +} + +#ifdef CONFIG_SGI_IOC3_ETH_HW_RX_CSUM + +static void ioc3_tcpudp_checksum(struct sk_buff *skb, uint32_t hwsum, int len) +{ + struct ethhdr *eh = eth_hdr(skb); + uint32_t csum, ehsum; + unsigned int proto; + struct iphdr *ih; + uint16_t *ew; + unsigned char *cp; + + /* + * Did hardware handle the checksum at all? The cases we can handle + * are: + * + * - TCP and UDP checksums of IPv4 only. + * - IPv6 would be doable but we keep that for later ... + * - Only unfragmented packets. Did somebody already tell you + * fragmentation is evil? + * - don't care about packet size. Worst case when processing a + * malformed packet we'll try to access the packet at ip header + + * 64 bytes which is still inside the skb. Even in the unlikely + * case where the checksum is right the higher layers will still + * drop the packet as appropriate. + */ + if (eh->h_proto != ntohs(ETH_P_IP)) + return; + + ih = (struct iphdr *) ((char *)eh + ETH_HLEN); + if (ih->frag_off & htons(IP_MF | IP_OFFSET)) + return; + + proto = ih->protocol; + if (proto != IPPROTO_TCP && proto != IPPROTO_UDP) + return; + + /* Same as tx - compute csum of pseudo header */ + csum = hwsum + + (ih->tot_len - (ih->ihl << 2)) + + htons((uint16_t)ih->protocol) + + (ih->saddr >> 16) + (ih->saddr & 0xffff) + + (ih->daddr >> 16) + (ih->daddr & 0xffff); + + /* Sum up ethernet dest addr, src addr and protocol */ + ew = (uint16_t *) eh; + ehsum = ew[0] + ew[1] + ew[2] + ew[3] + ew[4] + ew[5] + ew[6]; + + ehsum = (ehsum & 0xffff) + (ehsum >> 16); + ehsum = (ehsum & 0xffff) + (ehsum >> 16); + + csum += 0xffff ^ ehsum; + + /* In the next step we also subtract the 1's complement + checksum of the trailing ethernet CRC. */ + cp = (char *)eh + len; /* points at trailing CRC */ + if (len & 1) { + csum += 0xffff ^ (uint16_t) ((cp[1] << 8) | cp[0]); + csum += 0xffff ^ (uint16_t) ((cp[3] << 8) | cp[2]); + } else { + csum += 0xffff ^ (uint16_t) ((cp[0] << 8) | cp[1]); + csum += 0xffff ^ (uint16_t) ((cp[2] << 8) | cp[3]); + } + + csum = (csum & 0xffff) + (csum >> 16); + csum = (csum & 0xffff) + (csum >> 16); + + if (csum == 0xffff) + skb->ip_summed = CHECKSUM_UNNECESSARY; +} +#endif /* CONFIG_SGI_IOC3_ETH_HW_RX_CSUM */ + +static inline void ioc3_rx(struct ioc3_private *ip) +{ + struct sk_buff *skb, *new_skb; + struct ioc3 *ioc3 = ip->regs; + int rx_entry, n_entry, len; + struct ioc3_erxbuf *rxb; + unsigned long *rxr; + u32 w0, err; + + rxr = (unsigned long *) ip->rxr; /* Ring base */ + rx_entry = ip->rx_ci; /* RX consume index */ + n_entry = ip->rx_pi; + + skb = ip->rx_skbs[rx_entry]; + rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET); + w0 = be32_to_cpu(rxb->w0); + + while (w0 & ERXBUF_V) { + err = be32_to_cpu(rxb->err); /* It's valid ... */ + if (err & ERXBUF_GOODPKT) { + len = ((w0 >> ERXBUF_BYTECNT_SHIFT) & 0x7ff) - 4; + skb_trim(skb, len); + skb->protocol = eth_type_trans(skb, priv_netdev(ip)); + + new_skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC); + if (!new_skb) { + /* Ouch, drop packet and just recycle packet + to keep the ring filled. */ + ip->stats.rx_dropped++; + new_skb = skb; + goto next; + } + +#ifdef CONFIG_SGI_IOC3_ETH_HW_RX_CSUM + ioc3_tcpudp_checksum(skb, w0 & ERXBUF_IPCKSUM_MASK,len); +#endif + + netif_rx(skb); + + ip->rx_skbs[rx_entry] = NULL; /* Poison */ + + new_skb->dev = priv_netdev(ip); + + /* Because we reserve afterwards. */ + skb_put(new_skb, (1664 + RX_OFFSET)); + rxb = (struct ioc3_erxbuf *) new_skb->data; + skb_reserve(new_skb, RX_OFFSET); + + priv_netdev(ip)->last_rx = jiffies; + ip->stats.rx_packets++; /* Statistics */ + ip->stats.rx_bytes += len; + } else { + /* The frame is invalid and the skb never + reached the network layer so we can just + recycle it. */ + new_skb = skb; + ip->stats.rx_errors++; + } + if (err & ERXBUF_CRCERR) /* Statistics */ + ip->stats.rx_crc_errors++; + if (err & ERXBUF_FRAMERR) + ip->stats.rx_frame_errors++; +next: + ip->rx_skbs[n_entry] = new_skb; + rxr[n_entry] = cpu_to_be64(ioc3_map(rxb, 1)); + rxb->w0 = 0; /* Clear valid flag */ + n_entry = (n_entry + 1) & 511; /* Update erpir */ + + /* Now go on to the next ring entry. */ + rx_entry = (rx_entry + 1) & 511; + skb = ip->rx_skbs[rx_entry]; + rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET); + w0 = be32_to_cpu(rxb->w0); + } + ioc3_w_erpir((n_entry << 3) | ERPIR_ARM); + ip->rx_pi = n_entry; + ip->rx_ci = rx_entry; +} + +static inline void ioc3_tx(struct ioc3_private *ip) +{ + unsigned long packets, bytes; + struct ioc3 *ioc3 = ip->regs; + int tx_entry, o_entry; + struct sk_buff *skb; + u32 etcir; + + spin_lock(&ip->ioc3_lock); + etcir = ioc3_r_etcir(); + + tx_entry = (etcir >> 7) & 127; + o_entry = ip->tx_ci; + packets = 0; + bytes = 0; + + while (o_entry != tx_entry) { + packets++; + skb = ip->tx_skbs[o_entry]; + bytes += skb->len; + dev_kfree_skb_irq(skb); + ip->tx_skbs[o_entry] = NULL; + + o_entry = (o_entry + 1) & 127; /* Next */ + + etcir = ioc3_r_etcir(); /* More pkts sent? */ + tx_entry = (etcir >> 7) & 127; + } + + ip->stats.tx_packets += packets; + ip->stats.tx_bytes += bytes; + ip->txqlen -= packets; + + if (ip->txqlen < 128) + netif_wake_queue(priv_netdev(ip)); + + ip->tx_ci = o_entry; + spin_unlock(&ip->ioc3_lock); +} + +/* + * Deal with fatal IOC3 errors. This condition might be caused by a hard or + * software problems, so we should try to recover + * more gracefully if this ever happens. In theory we might be flooded + * with such error interrupts if something really goes wrong, so we might + * also consider to take the interface down. + */ +static void ioc3_error(struct ioc3_private *ip, u32 eisr) +{ + struct net_device *dev = priv_netdev(ip); + unsigned char *iface = dev->name; + + spin_lock(&ip->ioc3_lock); + + if (eisr & EISR_RXOFLO) + printk(KERN_ERR "%s: RX overflow.\n", iface); + if (eisr & EISR_RXBUFOFLO) + printk(KERN_ERR "%s: RX buffer overflow.\n", iface); + if (eisr & EISR_RXMEMERR) + printk(KERN_ERR "%s: RX PCI error.\n", iface); + if (eisr & EISR_RXPARERR) + printk(KERN_ERR "%s: RX SSRAM parity error.\n", iface); + if (eisr & EISR_TXBUFUFLO) + printk(KERN_ERR "%s: TX buffer underflow.\n", iface); + if (eisr & EISR_TXMEMERR) + printk(KERN_ERR "%s: TX PCI error.\n", iface); + + ioc3_stop(ip); + ioc3_init(dev); + ioc3_mii_init(ip); + + netif_wake_queue(dev); + + spin_unlock(&ip->ioc3_lock); +} + +/* The interrupt handler does all of the Rx thread work and cleans up + after the Tx thread. */ +static irqreturn_t ioc3_interrupt(int irq, void *_dev, struct pt_regs *regs) +{ + struct net_device *dev = (struct net_device *)_dev; + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + const u32 enabled = EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO | + EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO | + EISR_TXEXPLICIT | EISR_TXMEMERR; + u32 eisr; + + eisr = ioc3_r_eisr() & enabled; + + ioc3_w_eisr(eisr); + (void) ioc3_r_eisr(); /* Flush */ + + if (eisr & (EISR_RXOFLO | EISR_RXBUFOFLO | EISR_RXMEMERR | + EISR_RXPARERR | EISR_TXBUFUFLO | EISR_TXMEMERR)) + ioc3_error(ip, eisr); + if (eisr & EISR_RXTIMERINT) + ioc3_rx(ip); + if (eisr & EISR_TXEXPLICIT) + ioc3_tx(ip); + + return IRQ_HANDLED; +} + +static inline void ioc3_setup_duplex(struct ioc3_private *ip) +{ + struct ioc3 *ioc3 = ip->regs; + + if (ip->mii.full_duplex) { + ioc3_w_etcsr(ETCSR_FD); + ip->emcr |= EMCR_DUPLEX; + } else { + ioc3_w_etcsr(ETCSR_HD); + ip->emcr &= ~EMCR_DUPLEX; + } + ioc3_w_emcr(ip->emcr); +} + +static void ioc3_timer(unsigned long data) +{ + struct ioc3_private *ip = (struct ioc3_private *) data; + + /* Print the link status if it has changed */ + mii_check_media(&ip->mii, 1, 0); + ioc3_setup_duplex(ip); + + ip->ioc3_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2s */ + add_timer(&ip->ioc3_timer); +} + +/* + * Try to find a PHY. There is no apparent relation between the MII addresses + * in the SGI documentation and what we find in reality, so we simply probe + * for the PHY. It seems IOC3 PHYs usually live on address 31. One of my + * onboard IOC3s has the special oddity that probing doesn't seem to find it + * yet the interface seems to work fine, so if probing fails we for now will + * simply default to PHY 31 instead of bailing out. + */ +static int ioc3_mii_init(struct ioc3_private *ip) +{ + struct net_device *dev = priv_netdev(ip); + int i, found = 0, res = 0; + int ioc3_phy_workaround = 1; + u16 word; + + for (i = 0; i < 32; i++) { + word = ioc3_mdio_read(dev, i, MII_PHYSID1); + + if (word != 0xffff && word != 0x0000) { + found = 1; + break; /* Found a PHY */ + } + } + + if (!found) { + if (ioc3_phy_workaround) + i = 31; + else { + ip->mii.phy_id = -1; + res = -ENODEV; + goto out; + } + } + + ip->mii.phy_id = i; + ip->ioc3_timer.expires = jiffies + (12 * HZ)/10; /* 1.2 sec. */ + ip->ioc3_timer.data = (unsigned long) ip; + ip->ioc3_timer.function = &ioc3_timer; + add_timer(&ip->ioc3_timer); + +out: + return res; +} + +static inline void ioc3_clean_rx_ring(struct ioc3_private *ip) +{ + struct sk_buff *skb; + int i; + + for (i = ip->rx_ci; i & 15; i++) { + ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci]; + ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++]; + } + ip->rx_pi &= 511; + ip->rx_ci &= 511; + + for (i = ip->rx_ci; i != ip->rx_pi; i = (i+1) & 511) { + struct ioc3_erxbuf *rxb; + skb = ip->rx_skbs[i]; + rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET); + rxb->w0 = 0; + } +} + +static inline void ioc3_clean_tx_ring(struct ioc3_private *ip) +{ + struct sk_buff *skb; + int i; + + for (i=0; i < 128; i++) { + skb = ip->tx_skbs[i]; + if (skb) { + ip->tx_skbs[i] = NULL; + dev_kfree_skb_any(skb); + } + ip->txr[i].cmd = 0; + } + ip->tx_pi = 0; + ip->tx_ci = 0; +} + +static void ioc3_free_rings(struct ioc3_private *ip) +{ + struct sk_buff *skb; + int rx_entry, n_entry; + + if (ip->txr) { + ioc3_clean_tx_ring(ip); + free_pages((unsigned long)ip->txr, 2); + ip->txr = NULL; + } + + if (ip->rxr) { + n_entry = ip->rx_ci; + rx_entry = ip->rx_pi; + + while (n_entry != rx_entry) { + skb = ip->rx_skbs[n_entry]; + if (skb) + dev_kfree_skb_any(skb); + + n_entry = (n_entry + 1) & 511; + } + free_page((unsigned long)ip->rxr); + ip->rxr = NULL; + } +} + +static void ioc3_alloc_rings(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3_erxbuf *rxb; + unsigned long *rxr; + int i; + + if (ip->rxr == NULL) { + /* Allocate and initialize rx ring. 4kb = 512 entries */ + ip->rxr = (unsigned long *) get_zeroed_page(GFP_ATOMIC); + rxr = (unsigned long *) ip->rxr; + if (!rxr) + printk("ioc3_alloc_rings(): get_zeroed_page() failed!\n"); + + /* Now the rx buffers. The RX ring may be larger but + we only allocate 16 buffers for now. Need to tune + this for performance and memory later. */ + for (i = 0; i < RX_BUFFS; i++) { + struct sk_buff *skb; + + skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC); + if (!skb) { + show_free_areas(); + continue; + } + + ip->rx_skbs[i] = skb; + skb->dev = dev; + + /* Because we reserve afterwards. */ + skb_put(skb, (1664 + RX_OFFSET)); + rxb = (struct ioc3_erxbuf *) skb->data; + rxr[i] = cpu_to_be64(ioc3_map(rxb, 1)); + skb_reserve(skb, RX_OFFSET); + } + ip->rx_ci = 0; + ip->rx_pi = RX_BUFFS; + } + + if (ip->txr == NULL) { + /* Allocate and initialize tx rings. 16kb = 128 bufs. */ + ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2); + if (!ip->txr) + printk("ioc3_alloc_rings(): __get_free_pages() failed!\n"); + ip->tx_pi = 0; + ip->tx_ci = 0; + } +} + +static void ioc3_init_rings(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + unsigned long ring; + + ioc3_free_rings(ip); + ioc3_alloc_rings(dev); + + ioc3_clean_rx_ring(ip); + ioc3_clean_tx_ring(ip); + + /* Now the rx ring base, consume & produce registers. */ + ring = ioc3_map(ip->rxr, 0); + ioc3_w_erbr_h(ring >> 32); + ioc3_w_erbr_l(ring & 0xffffffff); + ioc3_w_ercir(ip->rx_ci << 3); + ioc3_w_erpir((ip->rx_pi << 3) | ERPIR_ARM); + + ring = ioc3_map(ip->txr, 0); + + ip->txqlen = 0; /* nothing queued */ + + /* Now the tx ring base, consume & produce registers. */ + ioc3_w_etbr_h(ring >> 32); + ioc3_w_etbr_l(ring & 0xffffffff); + ioc3_w_etpir(ip->tx_pi << 7); + ioc3_w_etcir(ip->tx_ci << 7); + (void) ioc3_r_etcir(); /* Flush */ +} + +static inline void ioc3_ssram_disc(struct ioc3_private *ip) +{ + struct ioc3 *ioc3 = ip->regs; + volatile u32 *ssram0 = &ioc3->ssram[0x0000]; + volatile u32 *ssram1 = &ioc3->ssram[0x4000]; + unsigned int pattern = 0x5555; + + /* Assume the larger size SSRAM and enable parity checking */ + ioc3_w_emcr(ioc3_r_emcr() | (EMCR_BUFSIZ | EMCR_RAMPAR)); + + *ssram0 = pattern; + *ssram1 = ~pattern & IOC3_SSRAM_DM; + + if ((*ssram0 & IOC3_SSRAM_DM) != pattern || + (*ssram1 & IOC3_SSRAM_DM) != (~pattern & IOC3_SSRAM_DM)) { + /* set ssram size to 64 KB */ + ip->emcr = EMCR_RAMPAR; + ioc3_w_emcr(ioc3_r_emcr() & ~EMCR_BUFSIZ); + } else + ip->emcr = EMCR_BUFSIZ | EMCR_RAMPAR; +} + +static void ioc3_init(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + del_timer(&ip->ioc3_timer); /* Kill if running */ + + ioc3_w_emcr(EMCR_RST); /* Reset */ + (void) ioc3_r_emcr(); /* Flush WB */ + udelay(4); /* Give it time ... */ + ioc3_w_emcr(0); + (void) ioc3_r_emcr(); + + /* Misc registers */ +#ifdef CONFIG_SGI_IP27 + ioc3_w_erbar(PCI64_ATTR_BAR >> 32); /* Barrier on last store */ +#else + ioc3_w_erbar(0); /* Let PCI API get it right */ +#endif + (void) ioc3_r_etcdc(); /* Clear on read */ + ioc3_w_ercsr(15); /* RX low watermark */ + ioc3_w_ertr(0); /* Interrupt immediately */ + __ioc3_set_mac_address(dev); + ioc3_w_ehar_h(ip->ehar_h); + ioc3_w_ehar_l(ip->ehar_l); + ioc3_w_ersr(42); /* XXX should be random */ + + ioc3_init_rings(dev); + + ip->emcr |= ((RX_OFFSET / 2) << EMCR_RXOFF_SHIFT) | EMCR_TXDMAEN | + EMCR_TXEN | EMCR_RXDMAEN | EMCR_RXEN | EMCR_PADEN; + ioc3_w_emcr(ip->emcr); + ioc3_w_eier(EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO | + EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO | + EISR_TXEXPLICIT | EISR_TXMEMERR); + (void) ioc3_r_eier(); +} + +static inline void ioc3_stop(struct ioc3_private *ip) +{ + struct ioc3 *ioc3 = ip->regs; + + ioc3_w_emcr(0); /* Shutup */ + ioc3_w_eier(0); /* Disable interrupts */ + (void) ioc3_r_eier(); /* Flush */ +} + +static int ioc3_open(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + + if (request_irq(dev->irq, ioc3_interrupt, SA_SHIRQ, ioc3_str, dev)) { + printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq); + + return -EAGAIN; + } + + ip->ehar_h = 0; + ip->ehar_l = 0; + ioc3_init(dev); + + netif_start_queue(dev); + return 0; +} + +static int ioc3_close(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + + del_timer(&ip->ioc3_timer); + + netif_stop_queue(dev); + + ioc3_stop(ip); + free_irq(dev->irq, dev); + + ioc3_free_rings(ip); + return 0; +} + +/* + * MENET cards have four IOC3 chips, which are attached to two sets of + * PCI slot resources each: the primary connections are on slots + * 0..3 and the secondaries are on 4..7 + * + * All four ethernets are brought out to connectors; six serial ports + * (a pair from each of the first three IOC3s) are brought out to + * MiniDINs; all other subdevices are left swinging in the wind, leave + * them disabled. + */ +static inline int ioc3_is_menet(struct pci_dev *pdev) +{ + struct pci_dev *dev; + + return pdev->bus->parent == NULL + && (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(0, 0))) + && dev->vendor == PCI_VENDOR_ID_SGI + && dev->device == PCI_DEVICE_ID_SGI_IOC3 + && (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(1, 0))) + && dev->vendor == PCI_VENDOR_ID_SGI + && dev->device == PCI_DEVICE_ID_SGI_IOC3 + && (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(2, 0))) + && dev->vendor == PCI_VENDOR_ID_SGI + && dev->device == PCI_DEVICE_ID_SGI_IOC3; +} + +#ifdef CONFIG_SERIAL_8250 +/* + * Note about serial ports and consoles: + * For console output, everyone uses the IOC3 UARTA (offset 0x178) + * connected to the master node (look in ip27_setup_console() and + * ip27prom_console_write()). + * + * For serial (/dev/ttyS0 etc), we can not have hardcoded serial port + * addresses on a partitioned machine. Since we currently use the ioc3 + * serial ports, we use dynamic serial port discovery that the serial.c + * driver uses for pci/pnp ports (there is an entry for the SGI ioc3 + * boards in pci_boards[]). Unfortunately, UARTA's pio address is greater + * than UARTB's, although UARTA on o200s has traditionally been known as + * port 0. So, we just use one serial port from each ioc3 (since the + * serial driver adds addresses to get to higher ports). + * + * The first one to do a register_console becomes the preferred console + * (if there is no kernel command line console= directive). /dev/console + * (ie 5, 1) is then "aliased" into the device number returned by the + * "device" routine referred to in this console structure + * (ip27prom_console_dev). + * + * Also look in ip27-pci.c:pci_fixup_ioc3() for some comments on working + * around ioc3 oddities in this respect. + * + * The IOC3 serials use a 22MHz clock rate with an additional divider by 3. + * (IOC3_BAUD = (22000000 / (3*16))) + */ + +static void __devinit ioc3_serial_probe(struct pci_dev *pdev, struct ioc3 *ioc3) +{ + struct serial_struct req; + + /* + * We need to recognice and treat the fourth MENET serial as it + * does not have an SuperIO chip attached to it, therefore attempting + * to access it will result in bus errors. We call something an + * MENET if PCI slot 0, 1, 2 and 3 of a master PCI bus all have an IOC3 + * in it. This is paranoid but we want to avoid blowing up on a + * showhorn PCI box that happens to have 4 IOC3 cards in it so it's + * not paranoid enough ... + */ + if (ioc3_is_menet(pdev) && PCI_SLOT(pdev->devfn) == 3) + return; + + /* Register to interrupt zero because we share the interrupt with + the serial driver which we don't properly support yet. */ + memset(&req, 0, sizeof(req)); + req.irq = 0; + req.flags = IOC3_COM_FLAGS; + req.io_type = SERIAL_IO_MEM; + req.iomem_reg_shift = 0; + req.baud_base = IOC3_BAUD; + + req.iomem_base = (unsigned char *) &ioc3->sregs.uarta; + register_serial(&req); + + req.iomem_base = (unsigned char *) &ioc3->sregs.uartb; + register_serial(&req); +} +#endif + +static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + unsigned int sw_physid1, sw_physid2; + struct net_device *dev = NULL; + struct ioc3_private *ip; + struct ioc3 *ioc3; + unsigned long ioc3_base, ioc3_size; + u32 vendor, model, rev; + int err, pci_using_dac; + + /* Configure DMA attributes. */ + err = pci_set_dma_mask(pdev, 0xffffffffffffffffULL); + if (!err) { + pci_using_dac = 1; + err = pci_set_consistent_dma_mask(pdev, 0xffffffffffffffffULL); + if (err < 0) { + printk(KERN_ERR "%s: Unable to obtain 64 bit DMA " + "for consistent allocations\n", pci_name(pdev)); + goto out; + } + } else { + err = pci_set_dma_mask(pdev, 0xffffffffULL); + if (err) { + printk(KERN_ERR "%s: No usable DMA configuration, " + "aborting.\n", pci_name(pdev)); + goto out; + } + pci_using_dac = 0; + } + + if (pci_enable_device(pdev)) + return -ENODEV; + + dev = alloc_etherdev(sizeof(struct ioc3_private)); + if (!dev) { + err = -ENOMEM; + goto out_disable; + } + + if (pci_using_dac) + dev->features |= NETIF_F_HIGHDMA; + + err = pci_request_regions(pdev, "ioc3"); + if (err) + goto out_free; + + SET_MODULE_OWNER(dev); + SET_NETDEV_DEV(dev, &pdev->dev); + + ip = netdev_priv(dev); + + dev->irq = pdev->irq; + + ioc3_base = pci_resource_start(pdev, 0); + ioc3_size = pci_resource_len(pdev, 0); + ioc3 = (struct ioc3 *) ioremap(ioc3_base, ioc3_size); + if (!ioc3) { + printk(KERN_CRIT "ioc3eth(%s): ioremap failed, goodbye.\n", + pci_name(pdev)); + err = -ENOMEM; + goto out_res; + } + ip->regs = ioc3; + +#ifdef CONFIG_SERIAL_8250 + ioc3_serial_probe(pdev, ioc3); +#endif + + spin_lock_init(&ip->ioc3_lock); + init_timer(&ip->ioc3_timer); + + ioc3_stop(ip); + ioc3_init(dev); + + ip->pdev = pdev; + + ip->mii.phy_id_mask = 0x1f; + ip->mii.reg_num_mask = 0x1f; + ip->mii.dev = dev; + ip->mii.mdio_read = ioc3_mdio_read; + ip->mii.mdio_write = ioc3_mdio_write; + + ioc3_mii_init(ip); + + if (ip->mii.phy_id == -1) { + printk(KERN_CRIT "ioc3-eth(%s): Didn't find a PHY, goodbye.\n", + pci_name(pdev)); + err = -ENODEV; + goto out_stop; + } + + ioc3_ssram_disc(ip); + ioc3_get_eaddr(ip); + + /* The IOC3-specific entries in the device structure. */ + dev->open = ioc3_open; + dev->hard_start_xmit = ioc3_start_xmit; + dev->tx_timeout = ioc3_timeout; + dev->watchdog_timeo = 5 * HZ; + dev->stop = ioc3_close; + dev->get_stats = ioc3_get_stats; + dev->do_ioctl = ioc3_ioctl; + dev->set_multicast_list = ioc3_set_multicast_list; + dev->set_mac_address = ioc3_set_mac_address; + dev->ethtool_ops = &ioc3_ethtool_ops; +#ifdef CONFIG_SGI_IOC3_ETH_HW_TX_CSUM + dev->features = NETIF_F_IP_CSUM; +#endif + + ioc3_setup_duplex(ip); + sw_physid1 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID1); + sw_physid2 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID2); + + err = register_netdev(dev); + if (err) + goto out_stop; + + mii_check_media(&ip->mii, 1, 1); + + vendor = (sw_physid1 << 12) | (sw_physid2 >> 4); + model = (sw_physid2 >> 4) & 0x3f; + rev = sw_physid2 & 0xf; + printk(KERN_INFO "%s: Using PHY %d, vendor 0x%x, model %d, " + "rev %d.\n", dev->name, ip->mii.phy_id, vendor, model, rev); + printk(KERN_INFO "%s: IOC3 SSRAM has %d kbyte.\n", dev->name, + ip->emcr & EMCR_BUFSIZ ? 128 : 64); + + return 0; + +out_stop: + ioc3_stop(ip); + ioc3_free_rings(ip); +out_res: + pci_release_regions(pdev); +out_free: + free_netdev(dev); +out_disable: + /* + * We should call pci_disable_device(pdev); here if the IOC3 wasn't + * such a weird device ... + */ +out: + return err; +} + +static void __devexit ioc3_remove_one (struct pci_dev *pdev) +{ + struct net_device *dev = pci_get_drvdata(pdev); + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + + unregister_netdev(dev); + iounmap(ioc3); + pci_release_regions(pdev); + free_netdev(dev); + /* + * We should call pci_disable_device(pdev); here if the IOC3 wasn't + * such a weird device ... + */ +} + +static struct pci_device_id ioc3_pci_tbl[] = { + { PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID }, + { 0 } +}; +MODULE_DEVICE_TABLE(pci, ioc3_pci_tbl); + +static struct pci_driver ioc3_driver = { + .name = "ioc3-eth", + .id_table = ioc3_pci_tbl, + .probe = ioc3_probe, + .remove = __devexit_p(ioc3_remove_one), +}; + +static int __init ioc3_init_module(void) +{ + return pci_module_init(&ioc3_driver); +} + +static void __exit ioc3_cleanup_module(void) +{ + pci_unregister_driver(&ioc3_driver); +} + +static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + unsigned long data; + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + unsigned int len; + struct ioc3_etxd *desc; + uint32_t w0 = 0; + int produce; + +#ifdef CONFIG_SGI_IOC3_ETH_HW_TX_CSUM + /* + * IOC3 has a fairly simple minded checksumming hardware which simply + * adds up the 1's complement checksum for the entire packet and + * inserts it at an offset which can be specified in the descriptor + * into the transmit packet. This means we have to compensate for the + * MAC header which should not be summed and the TCP/UDP pseudo headers + * manually. + */ + if (skb->ip_summed == CHECKSUM_HW) { + int proto = ntohs(skb->nh.iph->protocol); + unsigned int csoff; + struct iphdr *ih = skb->nh.iph; + uint32_t csum, ehsum; + uint16_t *eh; + + /* The MAC header. skb->mac seem the logic approach + to find the MAC header - except it's a NULL pointer ... */ + eh = (uint16_t *) skb->data; + + /* Sum up dest addr, src addr and protocol */ + ehsum = eh[0] + eh[1] + eh[2] + eh[3] + eh[4] + eh[5] + eh[6]; + + /* Fold ehsum. can't use csum_fold which negates also ... */ + ehsum = (ehsum & 0xffff) + (ehsum >> 16); + ehsum = (ehsum & 0xffff) + (ehsum >> 16); + + /* Skip IP header; it's sum is always zero and was + already filled in by ip_output.c */ + csum = csum_tcpudp_nofold(ih->saddr, ih->daddr, + ih->tot_len - (ih->ihl << 2), + proto, 0xffff ^ ehsum); + + csum = (csum & 0xffff) + (csum >> 16); /* Fold again */ + csum = (csum & 0xffff) + (csum >> 16); + + csoff = ETH_HLEN + (ih->ihl << 2); + if (proto == IPPROTO_UDP) { + csoff += offsetof(struct udphdr, check); + skb->h.uh->check = csum; + } + if (proto == IPPROTO_TCP) { + csoff += offsetof(struct tcphdr, check); + skb->h.th->check = csum; + } + + w0 = ETXD_DOCHECKSUM | (csoff << ETXD_CHKOFF_SHIFT); + } +#endif /* CONFIG_SGI_IOC3_ETH_HW_TX_CSUM */ + + spin_lock_irq(&ip->ioc3_lock); + + data = (unsigned long) skb->data; + len = skb->len; + + produce = ip->tx_pi; + desc = &ip->txr[produce]; + + if (len <= 104) { + /* Short packet, let's copy it directly into the ring. */ + memcpy(desc->data, skb->data, skb->len); + if (len < ETH_ZLEN) { + /* Very short packet, pad with zeros at the end. */ + memset(desc->data + len, 0, ETH_ZLEN - len); + len = ETH_ZLEN; + } + desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_D0V | w0); + desc->bufcnt = cpu_to_be32(len); + } else if ((data ^ (data + len - 1)) & 0x4000) { + unsigned long b2 = (data | 0x3fffUL) + 1UL; + unsigned long s1 = b2 - data; + unsigned long s2 = data + len - b2; + + desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | + ETXD_B1V | ETXD_B2V | w0); + desc->bufcnt = cpu_to_be32((s1 << ETXD_B1CNT_SHIFT) | + (s2 << ETXD_B2CNT_SHIFT)); + desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1)); + desc->p2 = cpu_to_be64(ioc3_map((void *) b2, 1)); + } else { + /* Normal sized packet that doesn't cross a page boundary. */ + desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_B1V | w0); + desc->bufcnt = cpu_to_be32(len << ETXD_B1CNT_SHIFT); + desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1)); + } + + BARRIER(); + + dev->trans_start = jiffies; + ip->tx_skbs[produce] = skb; /* Remember skb */ + produce = (produce + 1) & 127; + ip->tx_pi = produce; + ioc3_w_etpir(produce << 7); /* Fire ... */ + + ip->txqlen++; + + if (ip->txqlen >= 127) + netif_stop_queue(dev); + + spin_unlock_irq(&ip->ioc3_lock); + + return 0; +} + +static void ioc3_timeout(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + + printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name); + + spin_lock_irq(&ip->ioc3_lock); + + ioc3_stop(ip); + ioc3_init(dev); + ioc3_mii_init(ip); + + spin_unlock_irq(&ip->ioc3_lock); + + netif_wake_queue(dev); +} + +/* + * Given a multicast ethernet address, this routine calculates the + * address's bit index in the logical address filter mask + */ + +static inline unsigned int ioc3_hash(const unsigned char *addr) +{ + unsigned int temp = 0; + u32 crc; + int bits; + + crc = ether_crc_le(ETH_ALEN, addr); + + crc &= 0x3f; /* bit reverse lowest 6 bits for hash index */ + for (bits = 6; --bits >= 0; ) { + temp <<= 1; + temp |= (crc & 0x1); + crc >>= 1; + } + + return temp; +} + +static void ioc3_get_drvinfo (struct net_device *dev, + struct ethtool_drvinfo *info) +{ + struct ioc3_private *ip = netdev_priv(dev); + + strcpy (info->driver, IOC3_NAME); + strcpy (info->version, IOC3_VERSION); + strcpy (info->bus_info, pci_name(ip->pdev)); +} + +static int ioc3_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + struct ioc3_private *ip = netdev_priv(dev); + int rc; + + spin_lock_irq(&ip->ioc3_lock); + rc = mii_ethtool_gset(&ip->mii, cmd); + spin_unlock_irq(&ip->ioc3_lock); + + return rc; +} + +static int ioc3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + struct ioc3_private *ip = netdev_priv(dev); + int rc; + + spin_lock_irq(&ip->ioc3_lock); + rc = mii_ethtool_sset(&ip->mii, cmd); + spin_unlock_irq(&ip->ioc3_lock); + + return rc; +} + +static int ioc3_nway_reset(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + int rc; + + spin_lock_irq(&ip->ioc3_lock); + rc = mii_nway_restart(&ip->mii); + spin_unlock_irq(&ip->ioc3_lock); + + return rc; +} + +static u32 ioc3_get_link(struct net_device *dev) +{ + struct ioc3_private *ip = netdev_priv(dev); + int rc; + + spin_lock_irq(&ip->ioc3_lock); + rc = mii_link_ok(&ip->mii); + spin_unlock_irq(&ip->ioc3_lock); + + return rc; +} + +static struct ethtool_ops ioc3_ethtool_ops = { + .get_drvinfo = ioc3_get_drvinfo, + .get_settings = ioc3_get_settings, + .set_settings = ioc3_set_settings, + .nway_reset = ioc3_nway_reset, + .get_link = ioc3_get_link, +}; + +static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct ioc3_private *ip = netdev_priv(dev); + int rc; + + spin_lock_irq(&ip->ioc3_lock); + rc = generic_mii_ioctl(&ip->mii, if_mii(rq), cmd, NULL); + spin_unlock_irq(&ip->ioc3_lock); + + return rc; +} + +static void ioc3_set_multicast_list(struct net_device *dev) +{ + struct dev_mc_list *dmi = dev->mc_list; + struct ioc3_private *ip = netdev_priv(dev); + struct ioc3 *ioc3 = ip->regs; + u64 ehar = 0; + int i; + + netif_stop_queue(dev); /* Lock out others. */ + + if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */ + /* Unconditionally log net taps. */ + printk(KERN_INFO "%s: Promiscuous mode enabled.\n", dev->name); + ip->emcr |= EMCR_PROMISC; + ioc3_w_emcr(ip->emcr); + (void) ioc3_r_emcr(); + } else { + ip->emcr &= ~EMCR_PROMISC; + ioc3_w_emcr(ip->emcr); /* Clear promiscuous. */ + (void) ioc3_r_emcr(); + + if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) { + /* Too many for hashing to make sense or we want all + multicast packets anyway, so skip computing all the + hashes and just accept all packets. */ + ip->ehar_h = 0xffffffff; + ip->ehar_l = 0xffffffff; + } else { + for (i = 0; i < dev->mc_count; i++) { + char *addr = dmi->dmi_addr; + dmi = dmi->next; + + if (!(*addr & 1)) + continue; + + ehar |= (1UL << ioc3_hash(addr)); + } + ip->ehar_h = ehar >> 32; + ip->ehar_l = ehar & 0xffffffff; + } + ioc3_w_ehar_h(ip->ehar_h); + ioc3_w_ehar_l(ip->ehar_l); + } + + netif_wake_queue(dev); /* Let us get going again. */ +} + +MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); +MODULE_DESCRIPTION("SGI IOC3 Ethernet driver"); +MODULE_LICENSE("GPL"); + +module_init(ioc3_init_module); +module_exit(ioc3_cleanup_module); |
