diff options
Diffstat (limited to 'kernel/drivers/net/ethernet/pasemi/pasemi_mac.c')
| -rw-r--r-- | kernel/drivers/net/ethernet/pasemi/pasemi_mac.c | 1902 |
1 files changed, 1902 insertions, 0 deletions
diff --git a/kernel/drivers/net/ethernet/pasemi/pasemi_mac.c b/kernel/drivers/net/ethernet/pasemi/pasemi_mac.c new file mode 100644 index 000000000..57a6e6cd7 --- /dev/null +++ b/kernel/drivers/net/ethernet/pasemi/pasemi_mac.c @@ -0,0 +1,1902 @@ +/* + * Copyright (C) 2006-2007 PA Semi, Inc + * + * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/of_mdio.h> +#include <linux/etherdevice.h> +#include <asm/dma-mapping.h> +#include <linux/in.h> +#include <linux/skbuff.h> + +#include <linux/ip.h> +#include <linux/tcp.h> +#include <net/checksum.h> +#include <linux/inet_lro.h> +#include <linux/prefetch.h> + +#include <asm/irq.h> +#include <asm/firmware.h> +#include <asm/pasemi_dma.h> + +#include "pasemi_mac.h" + +/* We have our own align, since ppc64 in general has it at 0 because + * of design flaws in some of the server bridge chips. However, for + * PWRficient doing the unaligned copies is more expensive than doing + * unaligned DMA, so make sure the data is aligned instead. + */ +#define LOCAL_SKB_ALIGN 2 + +/* TODO list + * + * - Multicast support + * - Large MTU support + * - SW LRO + * - Multiqueue RX/TX + */ + +#define LRO_MAX_AGGR 64 + +#define PE_MIN_MTU 64 +#define PE_MAX_MTU 9000 +#define PE_DEF_MTU ETH_DATA_LEN + +#define DEFAULT_MSG_ENABLE \ + (NETIF_MSG_DRV | \ + NETIF_MSG_PROBE | \ + NETIF_MSG_LINK | \ + NETIF_MSG_TIMER | \ + NETIF_MSG_IFDOWN | \ + NETIF_MSG_IFUP | \ + NETIF_MSG_RX_ERR | \ + NETIF_MSG_TX_ERR) + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>"); +MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver"); + +static int debug = -1; /* -1 == use DEFAULT_MSG_ENABLE as value */ +module_param(debug, int, 0); +MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value"); + +extern const struct ethtool_ops pasemi_mac_ethtool_ops; + +static int translation_enabled(void) +{ +#if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE) + return 1; +#else + return firmware_has_feature(FW_FEATURE_LPAR); +#endif +} + +static void write_iob_reg(unsigned int reg, unsigned int val) +{ + pasemi_write_iob_reg(reg, val); +} + +static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg) +{ + return pasemi_read_mac_reg(mac->dma_if, reg); +} + +static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg, + unsigned int val) +{ + pasemi_write_mac_reg(mac->dma_if, reg, val); +} + +static unsigned int read_dma_reg(unsigned int reg) +{ + return pasemi_read_dma_reg(reg); +} + +static void write_dma_reg(unsigned int reg, unsigned int val) +{ + pasemi_write_dma_reg(reg, val); +} + +static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac) +{ + return mac->rx; +} + +static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac) +{ + return mac->tx; +} + +static inline void prefetch_skb(const struct sk_buff *skb) +{ + const void *d = skb; + + prefetch(d); + prefetch(d+64); + prefetch(d+128); + prefetch(d+192); +} + +static int mac_to_intf(struct pasemi_mac *mac) +{ + struct pci_dev *pdev = mac->pdev; + u32 tmp; + int nintf, off, i, j; + int devfn = pdev->devfn; + + tmp = read_dma_reg(PAS_DMA_CAP_IFI); + nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S; + off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S; + + /* IOFF contains the offset to the registers containing the + * DMA interface-to-MAC-pci-id mappings, and NIN contains number + * of total interfaces. Each register contains 4 devfns. + * Just do a linear search until we find the devfn of the MAC + * we're trying to look up. + */ + + for (i = 0; i < (nintf+3)/4; i++) { + tmp = read_dma_reg(off+4*i); + for (j = 0; j < 4; j++) { + if (((tmp >> (8*j)) & 0xff) == devfn) + return i*4 + j; + } + } + return -1; +} + +static void pasemi_mac_intf_disable(struct pasemi_mac *mac) +{ + unsigned int flags; + + flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG); + flags &= ~PAS_MAC_CFG_PCFG_PE; + write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags); +} + +static void pasemi_mac_intf_enable(struct pasemi_mac *mac) +{ + unsigned int flags; + + flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG); + flags |= PAS_MAC_CFG_PCFG_PE; + write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags); +} + +static int pasemi_get_mac_addr(struct pasemi_mac *mac) +{ + struct pci_dev *pdev = mac->pdev; + struct device_node *dn = pci_device_to_OF_node(pdev); + int len; + const u8 *maddr; + u8 addr[ETH_ALEN]; + + if (!dn) { + dev_dbg(&pdev->dev, + "No device node for mac, not configuring\n"); + return -ENOENT; + } + + maddr = of_get_property(dn, "local-mac-address", &len); + + if (maddr && len == ETH_ALEN) { + memcpy(mac->mac_addr, maddr, ETH_ALEN); + return 0; + } + + /* Some old versions of firmware mistakenly uses mac-address + * (and as a string) instead of a byte array in local-mac-address. + */ + + if (maddr == NULL) + maddr = of_get_property(dn, "mac-address", NULL); + + if (maddr == NULL) { + dev_warn(&pdev->dev, + "no mac address in device tree, not configuring\n"); + return -ENOENT; + } + + if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", + &addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) + != ETH_ALEN) { + dev_warn(&pdev->dev, + "can't parse mac address, not configuring\n"); + return -EINVAL; + } + + memcpy(mac->mac_addr, addr, ETH_ALEN); + + return 0; +} + +static int pasemi_mac_set_mac_addr(struct net_device *dev, void *p) +{ + struct pasemi_mac *mac = netdev_priv(dev); + struct sockaddr *addr = p; + unsigned int adr0, adr1; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + + adr0 = dev->dev_addr[2] << 24 | + dev->dev_addr[3] << 16 | + dev->dev_addr[4] << 8 | + dev->dev_addr[5]; + adr1 = read_mac_reg(mac, PAS_MAC_CFG_ADR1); + adr1 &= ~0xffff; + adr1 |= dev->dev_addr[0] << 8 | dev->dev_addr[1]; + + pasemi_mac_intf_disable(mac); + write_mac_reg(mac, PAS_MAC_CFG_ADR0, adr0); + write_mac_reg(mac, PAS_MAC_CFG_ADR1, adr1); + pasemi_mac_intf_enable(mac); + + return 0; +} + +static int get_skb_hdr(struct sk_buff *skb, void **iphdr, + void **tcph, u64 *hdr_flags, void *data) +{ + u64 macrx = (u64) data; + unsigned int ip_len; + struct iphdr *iph; + + /* IPv4 header checksum failed */ + if ((macrx & XCT_MACRX_HTY_M) != XCT_MACRX_HTY_IPV4_OK) + return -1; + + /* non tcp packet */ + skb_reset_network_header(skb); + iph = ip_hdr(skb); + if (iph->protocol != IPPROTO_TCP) + return -1; + + ip_len = ip_hdrlen(skb); + skb_set_transport_header(skb, ip_len); + *tcph = tcp_hdr(skb); + + /* check if ip header and tcp header are complete */ + if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb)) + return -1; + + *hdr_flags = LRO_IPV4 | LRO_TCP; + *iphdr = iph; + + return 0; +} + +static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac, + const int nfrags, + struct sk_buff *skb, + const dma_addr_t *dmas) +{ + int f; + struct pci_dev *pdev = mac->dma_pdev; + + pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE); + + for (f = 0; f < nfrags; f++) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; + + pci_unmap_page(pdev, dmas[f+1], skb_frag_size(frag), PCI_DMA_TODEVICE); + } + dev_kfree_skb_irq(skb); + + /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs, + * aligned up to a power of 2 + */ + return (nfrags + 3) & ~1; +} + +static struct pasemi_mac_csring *pasemi_mac_setup_csring(struct pasemi_mac *mac) +{ + struct pasemi_mac_csring *ring; + u32 val; + unsigned int cfg; + int chno; + + ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_csring), + offsetof(struct pasemi_mac_csring, chan)); + + if (!ring) { + dev_err(&mac->pdev->dev, "Can't allocate checksum channel\n"); + goto out_chan; + } + + chno = ring->chan.chno; + + ring->size = CS_RING_SIZE; + ring->next_to_fill = 0; + + /* Allocate descriptors */ + if (pasemi_dma_alloc_ring(&ring->chan, CS_RING_SIZE)) + goto out_ring_desc; + + write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno), + PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma)); + val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32); + val |= PAS_DMA_TXCHAN_BASEU_SIZ(CS_RING_SIZE >> 3); + + write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val); + + ring->events[0] = pasemi_dma_alloc_flag(); + ring->events[1] = pasemi_dma_alloc_flag(); + if (ring->events[0] < 0 || ring->events[1] < 0) + goto out_flags; + + pasemi_dma_clear_flag(ring->events[0]); + pasemi_dma_clear_flag(ring->events[1]); + + ring->fun = pasemi_dma_alloc_fun(); + if (ring->fun < 0) + goto out_fun; + + cfg = PAS_DMA_TXCHAN_CFG_TY_FUNC | PAS_DMA_TXCHAN_CFG_UP | + PAS_DMA_TXCHAN_CFG_TATTR(ring->fun) | + PAS_DMA_TXCHAN_CFG_LPSQ | PAS_DMA_TXCHAN_CFG_LPDQ; + + if (translation_enabled()) + cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR; + + write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg); + + /* enable channel */ + pasemi_dma_start_chan(&ring->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ | + PAS_DMA_TXCHAN_TCMDSTA_DB | + PAS_DMA_TXCHAN_TCMDSTA_DE | + PAS_DMA_TXCHAN_TCMDSTA_DA); + + return ring; + +out_fun: +out_flags: + if (ring->events[0] >= 0) + pasemi_dma_free_flag(ring->events[0]); + if (ring->events[1] >= 0) + pasemi_dma_free_flag(ring->events[1]); + pasemi_dma_free_ring(&ring->chan); +out_ring_desc: + pasemi_dma_free_chan(&ring->chan); +out_chan: + + return NULL; +} + +static void pasemi_mac_setup_csrings(struct pasemi_mac *mac) +{ + int i; + mac->cs[0] = pasemi_mac_setup_csring(mac); + if (mac->type == MAC_TYPE_XAUI) + mac->cs[1] = pasemi_mac_setup_csring(mac); + else + mac->cs[1] = 0; + + for (i = 0; i < MAX_CS; i++) + if (mac->cs[i]) + mac->num_cs++; +} + +static void pasemi_mac_free_csring(struct pasemi_mac_csring *csring) +{ + pasemi_dma_stop_chan(&csring->chan); + pasemi_dma_free_flag(csring->events[0]); + pasemi_dma_free_flag(csring->events[1]); + pasemi_dma_free_ring(&csring->chan); + pasemi_dma_free_chan(&csring->chan); + pasemi_dma_free_fun(csring->fun); +} + +static int pasemi_mac_setup_rx_resources(const struct net_device *dev) +{ + struct pasemi_mac_rxring *ring; + struct pasemi_mac *mac = netdev_priv(dev); + int chno; + unsigned int cfg; + + ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring), + offsetof(struct pasemi_mac_rxring, chan)); + + if (!ring) { + dev_err(&mac->pdev->dev, "Can't allocate RX channel\n"); + goto out_chan; + } + chno = ring->chan.chno; + + spin_lock_init(&ring->lock); + + ring->size = RX_RING_SIZE; + ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) * + RX_RING_SIZE, GFP_KERNEL); + + if (!ring->ring_info) + goto out_ring_info; + + /* Allocate descriptors */ + if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE)) + goto out_ring_desc; + + ring->buffers = dma_zalloc_coherent(&mac->dma_pdev->dev, + RX_RING_SIZE * sizeof(u64), + &ring->buf_dma, GFP_KERNEL); + if (!ring->buffers) + goto out_ring_desc; + + write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno), + PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma)); + + write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno), + PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) | + PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3)); + + cfg = PAS_DMA_RXCHAN_CFG_HBU(2); + + if (translation_enabled()) + cfg |= PAS_DMA_RXCHAN_CFG_CTR; + + write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg); + + write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if), + PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma)); + + write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if), + PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) | + PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3)); + + cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 | + PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP | + PAS_DMA_RXINT_CFG_HEN; + + if (translation_enabled()) + cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR; + + write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg); + + ring->next_to_fill = 0; + ring->next_to_clean = 0; + ring->mac = mac; + mac->rx = ring; + + return 0; + +out_ring_desc: + kfree(ring->ring_info); +out_ring_info: + pasemi_dma_free_chan(&ring->chan); +out_chan: + return -ENOMEM; +} + +static struct pasemi_mac_txring * +pasemi_mac_setup_tx_resources(const struct net_device *dev) +{ + struct pasemi_mac *mac = netdev_priv(dev); + u32 val; + struct pasemi_mac_txring *ring; + unsigned int cfg; + int chno; + + ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring), + offsetof(struct pasemi_mac_txring, chan)); + + if (!ring) { + dev_err(&mac->pdev->dev, "Can't allocate TX channel\n"); + goto out_chan; + } + + chno = ring->chan.chno; + + spin_lock_init(&ring->lock); + + ring->size = TX_RING_SIZE; + ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) * + TX_RING_SIZE, GFP_KERNEL); + if (!ring->ring_info) + goto out_ring_info; + + /* Allocate descriptors */ + if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE)) + goto out_ring_desc; + + write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno), + PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma)); + val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32); + val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3); + + write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val); + + cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE | + PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) | + PAS_DMA_TXCHAN_CFG_UP | + PAS_DMA_TXCHAN_CFG_WT(4); + + if (translation_enabled()) + cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR; + + write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg); + + ring->next_to_fill = 0; + ring->next_to_clean = 0; + ring->mac = mac; + + return ring; + +out_ring_desc: + kfree(ring->ring_info); +out_ring_info: + pasemi_dma_free_chan(&ring->chan); +out_chan: + return NULL; +} + +static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac) +{ + struct pasemi_mac_txring *txring = tx_ring(mac); + unsigned int i, j; + struct pasemi_mac_buffer *info; + dma_addr_t dmas[MAX_SKB_FRAGS+1]; + int freed, nfrags; + int start, limit; + + start = txring->next_to_clean; + limit = txring->next_to_fill; + + /* Compensate for when fill has wrapped and clean has not */ + if (start > limit) + limit += TX_RING_SIZE; + + for (i = start; i < limit; i += freed) { + info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)]; + if (info->dma && info->skb) { + nfrags = skb_shinfo(info->skb)->nr_frags; + for (j = 0; j <= nfrags; j++) + dmas[j] = txring->ring_info[(i+1+j) & + (TX_RING_SIZE-1)].dma; + freed = pasemi_mac_unmap_tx_skb(mac, nfrags, + info->skb, dmas); + } else { + freed = 2; + } + } + + kfree(txring->ring_info); + pasemi_dma_free_chan(&txring->chan); + +} + +static void pasemi_mac_free_rx_buffers(struct pasemi_mac *mac) +{ + struct pasemi_mac_rxring *rx = rx_ring(mac); + unsigned int i; + struct pasemi_mac_buffer *info; + + for (i = 0; i < RX_RING_SIZE; i++) { + info = &RX_DESC_INFO(rx, i); + if (info->skb && info->dma) { + pci_unmap_single(mac->dma_pdev, + info->dma, + info->skb->len, + PCI_DMA_FROMDEVICE); + dev_kfree_skb_any(info->skb); + } + info->dma = 0; + info->skb = NULL; + } + + for (i = 0; i < RX_RING_SIZE; i++) + RX_BUFF(rx, i) = 0; +} + +static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac) +{ + pasemi_mac_free_rx_buffers(mac); + + dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64), + rx_ring(mac)->buffers, rx_ring(mac)->buf_dma); + + kfree(rx_ring(mac)->ring_info); + pasemi_dma_free_chan(&rx_ring(mac)->chan); + mac->rx = NULL; +} + +static void pasemi_mac_replenish_rx_ring(struct net_device *dev, + const int limit) +{ + const struct pasemi_mac *mac = netdev_priv(dev); + struct pasemi_mac_rxring *rx = rx_ring(mac); + int fill, count; + + if (limit <= 0) + return; + + fill = rx_ring(mac)->next_to_fill; + for (count = 0; count < limit; count++) { + struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill); + u64 *buff = &RX_BUFF(rx, fill); + struct sk_buff *skb; + dma_addr_t dma; + + /* Entry in use? */ + WARN_ON(*buff); + + skb = netdev_alloc_skb(dev, mac->bufsz); + skb_reserve(skb, LOCAL_SKB_ALIGN); + + if (unlikely(!skb)) + break; + + dma = pci_map_single(mac->dma_pdev, skb->data, + mac->bufsz - LOCAL_SKB_ALIGN, + PCI_DMA_FROMDEVICE); + + if (unlikely(pci_dma_mapping_error(mac->dma_pdev, dma))) { + dev_kfree_skb_irq(info->skb); + break; + } + + info->skb = skb; + info->dma = dma; + *buff = XCT_RXB_LEN(mac->bufsz) | XCT_RXB_ADDR(dma); + fill++; + } + + wmb(); + + write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count); + + rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) & + (RX_RING_SIZE - 1); +} + +static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac) +{ + struct pasemi_mac_rxring *rx = rx_ring(mac); + unsigned int reg, pcnt; + /* Re-enable packet count interrupts: finally + * ack the packet count interrupt we got in rx_intr. + */ + + pcnt = *rx->chan.status & PAS_STATUS_PCNT_M; + + reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC; + + if (*rx->chan.status & PAS_STATUS_TIMER) + reg |= PAS_IOB_DMA_RXCH_RESET_TINTC; + + write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg); +} + +static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac) +{ + unsigned int reg, pcnt; + + /* Re-enable packet count interrupts */ + pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M; + + reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC; + + write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg); +} + + +static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac, + const u64 macrx) +{ + unsigned int rcmdsta, ccmdsta; + struct pasemi_dmachan *chan = &rx_ring(mac)->chan; + + if (!netif_msg_rx_err(mac)) + return; + + rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if)); + ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno)); + + printk(KERN_ERR "pasemi_mac: rx error. macrx %016llx, rx status %llx\n", + macrx, *chan->status); + + printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n", + rcmdsta, ccmdsta); +} + +static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac, + const u64 mactx) +{ + unsigned int cmdsta; + struct pasemi_dmachan *chan = &tx_ring(mac)->chan; + + if (!netif_msg_tx_err(mac)) + return; + + cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno)); + + printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016llx, "\ + "tx status 0x%016llx\n", mactx, *chan->status); + + printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta); +} + +static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, + const int limit) +{ + const struct pasemi_dmachan *chan = &rx->chan; + struct pasemi_mac *mac = rx->mac; + struct pci_dev *pdev = mac->dma_pdev; + unsigned int n; + int count, buf_index, tot_bytes, packets; + struct pasemi_mac_buffer *info; + struct sk_buff *skb; + unsigned int len; + u64 macrx, eval; + dma_addr_t dma; + + tot_bytes = 0; + packets = 0; + + spin_lock(&rx->lock); + + n = rx->next_to_clean; + + prefetch(&RX_DESC(rx, n)); + + for (count = 0; count < limit; count++) { + macrx = RX_DESC(rx, n); + prefetch(&RX_DESC(rx, n+4)); + + if ((macrx & XCT_MACRX_E) || + (*chan->status & PAS_STATUS_ERROR)) + pasemi_mac_rx_error(mac, macrx); + + if (!(macrx & XCT_MACRX_O)) + break; + + info = NULL; + + BUG_ON(!(macrx & XCT_MACRX_RR_8BRES)); + + eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >> + XCT_RXRES_8B_EVAL_S; + buf_index = eval-1; + + dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M); + info = &RX_DESC_INFO(rx, buf_index); + + skb = info->skb; + + prefetch_skb(skb); + + len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S; + + pci_unmap_single(pdev, dma, mac->bufsz - LOCAL_SKB_ALIGN, + PCI_DMA_FROMDEVICE); + + if (macrx & XCT_MACRX_CRC) { + /* CRC error flagged */ + mac->netdev->stats.rx_errors++; + mac->netdev->stats.rx_crc_errors++; + /* No need to free skb, it'll be reused */ + goto next; + } + + info->skb = NULL; + info->dma = 0; + + if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) { + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->csum = (macrx & XCT_MACRX_CSUM_M) >> + XCT_MACRX_CSUM_S; + } else { + skb_checksum_none_assert(skb); + } + + packets++; + tot_bytes += len; + + /* Don't include CRC */ + skb_put(skb, len-4); + + skb->protocol = eth_type_trans(skb, mac->netdev); + lro_receive_skb(&mac->lro_mgr, skb, (void *)macrx); + +next: + RX_DESC(rx, n) = 0; + RX_DESC(rx, n+1) = 0; + + /* Need to zero it out since hardware doesn't, since the + * replenish loop uses it to tell when it's done. + */ + RX_BUFF(rx, buf_index) = 0; + + n += 4; + } + + if (n > RX_RING_SIZE) { + /* Errata 5971 workaround: L2 target of headers */ + write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0); + n &= (RX_RING_SIZE-1); + } + + rx_ring(mac)->next_to_clean = n; + + lro_flush_all(&mac->lro_mgr); + + /* Increase is in number of 16-byte entries, and since each descriptor + * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with + * count*2. + */ + write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1); + + pasemi_mac_replenish_rx_ring(mac->netdev, count); + + mac->netdev->stats.rx_bytes += tot_bytes; + mac->netdev->stats.rx_packets += packets; + + spin_unlock(&rx_ring(mac)->lock); + + return count; +} + +/* Can't make this too large or we blow the kernel stack limits */ +#define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS) + +static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring) +{ + struct pasemi_dmachan *chan = &txring->chan; + struct pasemi_mac *mac = txring->mac; + int i, j; + unsigned int start, descr_count, buf_count, batch_limit; + unsigned int ring_limit; + unsigned int total_count; + unsigned long flags; + struct sk_buff *skbs[TX_CLEAN_BATCHSIZE]; + dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1]; + int nf[TX_CLEAN_BATCHSIZE]; + int nr_frags; + + total_count = 0; + batch_limit = TX_CLEAN_BATCHSIZE; +restart: + spin_lock_irqsave(&txring->lock, flags); + + start = txring->next_to_clean; + ring_limit = txring->next_to_fill; + + prefetch(&TX_DESC_INFO(txring, start+1).skb); + + /* Compensate for when fill has wrapped but clean has not */ + if (start > ring_limit) + ring_limit += TX_RING_SIZE; + + buf_count = 0; + descr_count = 0; + + for (i = start; + descr_count < batch_limit && i < ring_limit; + i += buf_count) { + u64 mactx = TX_DESC(txring, i); + struct sk_buff *skb; + + if ((mactx & XCT_MACTX_E) || + (*chan->status & PAS_STATUS_ERROR)) + pasemi_mac_tx_error(mac, mactx); + + /* Skip over control descriptors */ + if (!(mactx & XCT_MACTX_LLEN_M)) { + TX_DESC(txring, i) = 0; + TX_DESC(txring, i+1) = 0; + buf_count = 2; + continue; + } + + skb = TX_DESC_INFO(txring, i+1).skb; + nr_frags = TX_DESC_INFO(txring, i).dma; + + if (unlikely(mactx & XCT_MACTX_O)) + /* Not yet transmitted */ + break; + + buf_count = 2 + nr_frags; + /* Since we always fill with an even number of entries, make + * sure we skip any unused one at the end as well. + */ + if (buf_count & 1) + buf_count++; + + for (j = 0; j <= nr_frags; j++) + dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma; + + skbs[descr_count] = skb; + nf[descr_count] = nr_frags; + + TX_DESC(txring, i) = 0; + TX_DESC(txring, i+1) = 0; + + descr_count++; + } + txring->next_to_clean = i & (TX_RING_SIZE-1); + + spin_unlock_irqrestore(&txring->lock, flags); + netif_wake_queue(mac->netdev); + + for (i = 0; i < descr_count; i++) + pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]); + + total_count += descr_count; + + /* If the batch was full, try to clean more */ + if (descr_count == batch_limit) + goto restart; + + return total_count; +} + + +static irqreturn_t pasemi_mac_rx_intr(int irq, void *data) +{ + const struct pasemi_mac_rxring *rxring = data; + struct pasemi_mac *mac = rxring->mac; + const struct pasemi_dmachan *chan = &rxring->chan; + unsigned int reg; + + if (!(*chan->status & PAS_STATUS_CAUSE_M)) + return IRQ_NONE; + + /* Don't reset packet count so it won't fire again but clear + * all others. + */ + + reg = 0; + if (*chan->status & PAS_STATUS_SOFT) + reg |= PAS_IOB_DMA_RXCH_RESET_SINTC; + if (*chan->status & PAS_STATUS_ERROR) + reg |= PAS_IOB_DMA_RXCH_RESET_DINTC; + + napi_schedule(&mac->napi); + + write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg); + + return IRQ_HANDLED; +} + +#define TX_CLEAN_INTERVAL HZ + +static void pasemi_mac_tx_timer(unsigned long data) +{ + struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data; + struct pasemi_mac *mac = txring->mac; + + pasemi_mac_clean_tx(txring); + + mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL); + + pasemi_mac_restart_tx_intr(mac); +} + +static irqreturn_t pasemi_mac_tx_intr(int irq, void *data) +{ + struct pasemi_mac_txring *txring = data; + const struct pasemi_dmachan *chan = &txring->chan; + struct pasemi_mac *mac = txring->mac; + unsigned int reg; + + if (!(*chan->status & PAS_STATUS_CAUSE_M)) + return IRQ_NONE; + + reg = 0; + + if (*chan->status & PAS_STATUS_SOFT) + reg |= PAS_IOB_DMA_TXCH_RESET_SINTC; + if (*chan->status & PAS_STATUS_ERROR) + reg |= PAS_IOB_DMA_TXCH_RESET_DINTC; + + mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2); + + napi_schedule(&mac->napi); + + if (reg) + write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg); + + return IRQ_HANDLED; +} + +static void pasemi_adjust_link(struct net_device *dev) +{ + struct pasemi_mac *mac = netdev_priv(dev); + int msg; + unsigned int flags; + unsigned int new_flags; + + if (!mac->phydev->link) { + /* If no link, MAC speed settings don't matter. Just report + * link down and return. + */ + if (mac->link && netif_msg_link(mac)) + printk(KERN_INFO "%s: Link is down.\n", dev->name); + + netif_carrier_off(dev); + pasemi_mac_intf_disable(mac); + mac->link = 0; + + return; + } else { + pasemi_mac_intf_enable(mac); + netif_carrier_on(dev); + } + + flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG); + new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M | + PAS_MAC_CFG_PCFG_TSR_M); + + if (!mac->phydev->duplex) + new_flags |= PAS_MAC_CFG_PCFG_HD; + + switch (mac->phydev->speed) { + case 1000: + new_flags |= PAS_MAC_CFG_PCFG_SPD_1G | + PAS_MAC_CFG_PCFG_TSR_1G; + break; + case 100: + new_flags |= PAS_MAC_CFG_PCFG_SPD_100M | + PAS_MAC_CFG_PCFG_TSR_100M; + break; + case 10: + new_flags |= PAS_MAC_CFG_PCFG_SPD_10M | + PAS_MAC_CFG_PCFG_TSR_10M; + break; + default: + printk("Unsupported speed %d\n", mac->phydev->speed); + } + + /* Print on link or speed/duplex change */ + msg = mac->link != mac->phydev->link || flags != new_flags; + + mac->duplex = mac->phydev->duplex; + mac->speed = mac->phydev->speed; + mac->link = mac->phydev->link; + + if (new_flags != flags) + write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags); + + if (msg && netif_msg_link(mac)) + printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n", + dev->name, mac->speed, mac->duplex ? "full" : "half"); +} + +static int pasemi_mac_phy_init(struct net_device *dev) +{ + struct pasemi_mac *mac = netdev_priv(dev); + struct device_node *dn, *phy_dn; + struct phy_device *phydev; + + dn = pci_device_to_OF_node(mac->pdev); + phy_dn = of_parse_phandle(dn, "phy-handle", 0); + of_node_put(phy_dn); + + mac->link = 0; + mac->speed = 0; + mac->duplex = -1; + + phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0, + PHY_INTERFACE_MODE_SGMII); + + if (!phydev) { + printk(KERN_ERR "%s: Could not attach to phy\n", dev->name); + return -ENODEV; + } + + mac->phydev = phydev; + + return 0; +} + + +static int pasemi_mac_open(struct net_device *dev) +{ + struct pasemi_mac *mac = netdev_priv(dev); + unsigned int flags; + int i, ret; + + flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) | + PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) | + PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12); + + write_mac_reg(mac, PAS_MAC_CFG_TXP, flags); + + ret = pasemi_mac_setup_rx_resources(dev); + if (ret) + goto out_rx_resources; + + mac->tx = pasemi_mac_setup_tx_resources(dev); + + if (!mac->tx) + goto out_tx_ring; + + /* We might already have allocated rings in case mtu was changed + * before interface was brought up. + */ + if (dev->mtu > 1500 && !mac->num_cs) { + pasemi_mac_setup_csrings(mac); + if (!mac->num_cs) + goto out_tx_ring; + } + + /* Zero out rmon counters */ + for (i = 0; i < 32; i++) + write_mac_reg(mac, PAS_MAC_RMON(i), 0); + + /* 0x3ff with 33MHz clock is about 31us */ + write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG, + PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff)); + + write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno), + PAS_IOB_DMA_RXCH_CFG_CNTTH(256)); + + write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno), + PAS_IOB_DMA_TXCH_CFG_CNTTH(32)); + + write_mac_reg(mac, PAS_MAC_IPC_CHNL, + PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) | + PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno)); + + /* enable rx if */ + write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), + PAS_DMA_RXINT_RCMDSTA_EN | + PAS_DMA_RXINT_RCMDSTA_DROPS_M | + PAS_DMA_RXINT_RCMDSTA_BP | + PAS_DMA_RXINT_RCMDSTA_OO | + PAS_DMA_RXINT_RCMDSTA_BT); + + /* enable rx channel */ + pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU | + PAS_DMA_RXCHAN_CCMDSTA_OD | + PAS_DMA_RXCHAN_CCMDSTA_FD | + PAS_DMA_RXCHAN_CCMDSTA_DT); + + /* enable tx channel */ + pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ | + PAS_DMA_TXCHAN_TCMDSTA_DB | + PAS_DMA_TXCHAN_TCMDSTA_DE | + PAS_DMA_TXCHAN_TCMDSTA_DA); + + pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE); + + write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno), + RX_RING_SIZE>>1); + + /* Clear out any residual packet count state from firmware */ + pasemi_mac_restart_rx_intr(mac); + pasemi_mac_restart_tx_intr(mac); + + flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE; + + if (mac->type == MAC_TYPE_GMAC) + flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G; + else + flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G; + + /* Enable interface in MAC */ + write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags); + + ret = pasemi_mac_phy_init(dev); + if (ret) { + /* Since we won't get link notification, just enable RX */ + pasemi_mac_intf_enable(mac); + if (mac->type == MAC_TYPE_GMAC) { + /* Warn for missing PHY on SGMII (1Gig) ports */ + dev_warn(&mac->pdev->dev, + "PHY init failed: %d.\n", ret); + dev_warn(&mac->pdev->dev, + "Defaulting to 1Gbit full duplex\n"); + } + } + + netif_start_queue(dev); + napi_enable(&mac->napi); + + snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx", + dev->name); + + ret = request_irq(mac->tx->chan.irq, pasemi_mac_tx_intr, 0, + mac->tx_irq_name, mac->tx); + if (ret) { + dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n", + mac->tx->chan.irq, ret); + goto out_tx_int; + } + + snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx", + dev->name); + + ret = request_irq(mac->rx->chan.irq, pasemi_mac_rx_intr, 0, + mac->rx_irq_name, mac->rx); + if (ret) { + dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n", + mac->rx->chan.irq, ret); + goto out_rx_int; + } + + if (mac->phydev) + phy_start(mac->phydev); + + setup_timer(&mac->tx->clean_timer, pasemi_mac_tx_timer, + (unsigned long)mac->tx); + mod_timer(&mac->tx->clean_timer, jiffies + HZ); + + return 0; + +out_rx_int: + free_irq(mac->tx->chan.irq, mac->tx); +out_tx_int: + napi_disable(&mac->napi); + netif_stop_queue(dev); +out_tx_ring: + if (mac->tx) + pasemi_mac_free_tx_resources(mac); + pasemi_mac_free_rx_resources(mac); +out_rx_resources: + + return ret; +} + +#define MAX_RETRIES 5000 + +static void pasemi_mac_pause_txchan(struct pasemi_mac *mac) +{ + unsigned int sta, retries; + int txch = tx_ring(mac)->chan.chno; + + write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), + PAS_DMA_TXCHAN_TCMDSTA_ST); + + for (retries = 0; retries < MAX_RETRIES; retries++) { + sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch)); + if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)) + break; + cond_resched(); + } + + if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT) + dev_err(&mac->dma_pdev->dev, + "Failed to stop tx channel, tcmdsta %08x\n", sta); + + write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0); +} + +static void pasemi_mac_pause_rxchan(struct pasemi_mac *mac) +{ + unsigned int sta, retries; + int rxch = rx_ring(mac)->chan.chno; + + write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), + PAS_DMA_RXCHAN_CCMDSTA_ST); + for (retries = 0; retries < MAX_RETRIES; retries++) { + sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch)); + if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)) + break; + cond_resched(); + } + + if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT) + dev_err(&mac->dma_pdev->dev, + "Failed to stop rx channel, ccmdsta 08%x\n", sta); + write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0); +} + +static void pasemi_mac_pause_rxint(struct pasemi_mac *mac) +{ + unsigned int sta, retries; + + write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), + PAS_DMA_RXINT_RCMDSTA_ST); + for (retries = 0; retries < MAX_RETRIES; retries++) { + sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if)); + if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT)) + break; + cond_resched(); + } + + if (sta & PAS_DMA_RXINT_RCMDSTA_ACT) + dev_err(&mac->dma_pdev->dev, + "Failed to stop rx interface, rcmdsta %08x\n", sta); + write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0); +} + +static int pasemi_mac_close(struct net_device *dev) +{ + struct pasemi_mac *mac = netdev_priv(dev); + unsigned int sta; + int rxch, txch, i; + + rxch = rx_ring(mac)->chan.chno; + txch = tx_ring(mac)->chan.chno; + + if (mac->phydev) { + phy_stop(mac->phydev); + phy_disconnect(mac->phydev); + } + + del_timer_sync(&mac->tx->clean_timer); + + netif_stop_queue(dev); + napi_disable(&mac->napi); + + sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if)); + if (sta & (PAS_DMA_RXINT_RCMDSTA_BP | + PAS_DMA_RXINT_RCMDSTA_OO | + PAS_DMA_RXINT_RCMDSTA_BT)) + printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta); + + sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch)); + if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU | + PAS_DMA_RXCHAN_CCMDSTA_OD | + PAS_DMA_RXCHAN_CCMDSTA_FD | + PAS_DMA_RXCHAN_CCMDSTA_DT)) + printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta); + + sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch)); + if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB | + PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA)) + printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta); + + /* Clean out any pending buffers */ + pasemi_mac_clean_tx(tx_ring(mac)); + pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE); + + pasemi_mac_pause_txchan(mac); + pasemi_mac_pause_rxint(mac); + pasemi_mac_pause_rxchan(mac); + pasemi_mac_intf_disable(mac); + + free_irq(mac->tx->chan.irq, mac->tx); + free_irq(mac->rx->chan.irq, mac->rx); + + for (i = 0; i < mac->num_cs; i++) { + pasemi_mac_free_csring(mac->cs[i]); + mac->cs[i] = NULL; + } + + mac->num_cs = 0; + + /* Free resources */ + pasemi_mac_free_rx_resources(mac); + pasemi_mac_free_tx_resources(mac); + + return 0; +} + +static void pasemi_mac_queue_csdesc(const struct sk_buff *skb, + const dma_addr_t *map, + const unsigned int *map_size, + struct pasemi_mac_txring *txring, + struct pasemi_mac_csring *csring) +{ + u64 fund; + dma_addr_t cs_dest; + const int nh_off = skb_network_offset(skb); + const int nh_len = skb_network_header_len(skb); + const int nfrags = skb_shinfo(skb)->nr_frags; + int cs_size, i, fill, hdr, cpyhdr, evt; + dma_addr_t csdma; + + fund = XCT_FUN_ST | XCT_FUN_RR_8BRES | + XCT_FUN_O | XCT_FUN_FUN(csring->fun) | + XCT_FUN_CRM_SIG | XCT_FUN_LLEN(skb->len - nh_off) | + XCT_FUN_SHL(nh_len >> 2) | XCT_FUN_SE; + + switch (ip_hdr(skb)->protocol) { + case IPPROTO_TCP: + fund |= XCT_FUN_SIG_TCP4; + /* TCP checksum is 16 bytes into the header */ + cs_dest = map[0] + skb_transport_offset(skb) + 16; + break; + case IPPROTO_UDP: + fund |= XCT_FUN_SIG_UDP4; + /* UDP checksum is 6 bytes into the header */ + cs_dest = map[0] + skb_transport_offset(skb) + 6; + break; + default: + BUG(); + } + + /* Do the checksum offloaded */ + fill = csring->next_to_fill; + hdr = fill; + + CS_DESC(csring, fill++) = fund; + /* Room for 8BRES. Checksum result is really 2 bytes into it */ + csdma = csring->chan.ring_dma + (fill & (CS_RING_SIZE-1)) * 8 + 2; + CS_DESC(csring, fill++) = 0; + + CS_DESC(csring, fill) = XCT_PTR_LEN(map_size[0]-nh_off) | XCT_PTR_ADDR(map[0]+nh_off); + for (i = 1; i <= nfrags; i++) + CS_DESC(csring, fill+i) = XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]); + + fill += i; + if (fill & 1) + fill++; + + /* Copy the result into the TCP packet */ + cpyhdr = fill; + CS_DESC(csring, fill++) = XCT_FUN_O | XCT_FUN_FUN(csring->fun) | + XCT_FUN_LLEN(2) | XCT_FUN_SE; + CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(cs_dest) | XCT_PTR_T; + CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(csdma); + fill++; + + evt = !csring->last_event; + csring->last_event = evt; + + /* Event handshaking with MAC TX */ + CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O | + CTRL_CMD_ETYPE_SET | CTRL_CMD_REG(csring->events[evt]); + CS_DESC(csring, fill++) = 0; + CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O | + CTRL_CMD_ETYPE_WCLR | CTRL_CMD_REG(csring->events[!evt]); + CS_DESC(csring, fill++) = 0; + csring->next_to_fill = fill & (CS_RING_SIZE-1); + + cs_size = fill - hdr; + write_dma_reg(PAS_DMA_TXCHAN_INCR(csring->chan.chno), (cs_size) >> 1); + + /* TX-side event handshaking */ + fill = txring->next_to_fill; + TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O | + CTRL_CMD_ETYPE_WSET | CTRL_CMD_REG(csring->events[evt]); + TX_DESC(txring, fill++) = 0; + TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O | + CTRL_CMD_ETYPE_CLR | CTRL_CMD_REG(csring->events[!evt]); + TX_DESC(txring, fill++) = 0; + txring->next_to_fill = fill; + + write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), 2); +} + +static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct pasemi_mac * const mac = netdev_priv(dev); + struct pasemi_mac_txring * const txring = tx_ring(mac); + struct pasemi_mac_csring *csring; + u64 dflags = 0; + u64 mactx; + dma_addr_t map[MAX_SKB_FRAGS+1]; + unsigned int map_size[MAX_SKB_FRAGS+1]; + unsigned long flags; + int i, nfrags; + int fill; + const int nh_off = skb_network_offset(skb); + const int nh_len = skb_network_header_len(skb); + + prefetch(&txring->ring_info); + + dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD; + + nfrags = skb_shinfo(skb)->nr_frags; + + map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb), + PCI_DMA_TODEVICE); + map_size[0] = skb_headlen(skb); + if (pci_dma_mapping_error(mac->dma_pdev, map[0])) + goto out_err_nolock; + + for (i = 0; i < nfrags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + map[i + 1] = skb_frag_dma_map(&mac->dma_pdev->dev, frag, 0, + skb_frag_size(frag), DMA_TO_DEVICE); + map_size[i+1] = skb_frag_size(frag); + if (dma_mapping_error(&mac->dma_pdev->dev, map[i + 1])) { + nfrags = i; + goto out_err_nolock; + } + } + + if (skb->ip_summed == CHECKSUM_PARTIAL && skb->len <= 1540) { + switch (ip_hdr(skb)->protocol) { + case IPPROTO_TCP: + dflags |= XCT_MACTX_CSUM_TCP; + dflags |= XCT_MACTX_IPH(nh_len >> 2); + dflags |= XCT_MACTX_IPO(nh_off); + break; + case IPPROTO_UDP: + dflags |= XCT_MACTX_CSUM_UDP; + dflags |= XCT_MACTX_IPH(nh_len >> 2); + dflags |= XCT_MACTX_IPO(nh_off); + break; + default: + WARN_ON(1); + } + } + + mactx = dflags | XCT_MACTX_LLEN(skb->len); + + spin_lock_irqsave(&txring->lock, flags); + + /* Avoid stepping on the same cache line that the DMA controller + * is currently about to send, so leave at least 8 words available. + * Total free space needed is mactx + fragments + 8 + */ + if (RING_AVAIL(txring) < nfrags + 14) { + /* no room -- stop the queue and wait for tx intr */ + netif_stop_queue(dev); + goto out_err; + } + + /* Queue up checksum + event descriptors, if needed */ + if (mac->num_cs && skb->ip_summed == CHECKSUM_PARTIAL && skb->len > 1540) { + csring = mac->cs[mac->last_cs]; + mac->last_cs = (mac->last_cs + 1) % mac->num_cs; + + pasemi_mac_queue_csdesc(skb, map, map_size, txring, csring); + } + + fill = txring->next_to_fill; + TX_DESC(txring, fill) = mactx; + TX_DESC_INFO(txring, fill).dma = nfrags; + fill++; + TX_DESC_INFO(txring, fill).skb = skb; + for (i = 0; i <= nfrags; i++) { + TX_DESC(txring, fill+i) = + XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]); + TX_DESC_INFO(txring, fill+i).dma = map[i]; + } + + /* We have to add an even number of 8-byte entries to the ring + * even if the last one is unused. That means always an odd number + * of pointers + one mactx descriptor. + */ + if (nfrags & 1) + nfrags++; + + txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1); + + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb->len; + + spin_unlock_irqrestore(&txring->lock, flags); + + write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1); + + return NETDEV_TX_OK; + +out_err: + spin_unlock_irqrestore(&txring->lock, flags); +out_err_nolock: + while (nfrags--) + pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags], + PCI_DMA_TODEVICE); + + return NETDEV_TX_BUSY; +} + +static void pasemi_mac_set_rx_mode(struct net_device *dev) +{ + const struct pasemi_mac *mac = netdev_priv(dev); + unsigned int flags; + + flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG); + + /* Set promiscuous */ + if (dev->flags & IFF_PROMISC) + flags |= PAS_MAC_CFG_PCFG_PR; + else + flags &= ~PAS_MAC_CFG_PCFG_PR; + + write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags); +} + + +static int pasemi_mac_poll(struct napi_struct *napi, int budget) +{ + struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi); + int pkts; + + pasemi_mac_clean_tx(tx_ring(mac)); + pkts = pasemi_mac_clean_rx(rx_ring(mac), budget); + if (pkts < budget) { + /* all done, no more packets present */ + napi_complete(napi); + + pasemi_mac_restart_rx_intr(mac); + pasemi_mac_restart_tx_intr(mac); + } + return pkts; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +/* + * Polling 'interrupt' - used by things like netconsole to send skbs + * without having to re-enable interrupts. It's not called while + * the interrupt routine is executing. + */ +static void pasemi_mac_netpoll(struct net_device *dev) +{ + const struct pasemi_mac *mac = netdev_priv(dev); + + disable_irq(mac->tx->chan.irq); + pasemi_mac_tx_intr(mac->tx->chan.irq, mac->tx); + enable_irq(mac->tx->chan.irq); + + disable_irq(mac->rx->chan.irq); + pasemi_mac_rx_intr(mac->rx->chan.irq, mac->rx); + enable_irq(mac->rx->chan.irq); +} +#endif + +static int pasemi_mac_change_mtu(struct net_device *dev, int new_mtu) +{ + struct pasemi_mac *mac = netdev_priv(dev); + unsigned int reg; + unsigned int rcmdsta = 0; + int running; + int ret = 0; + + if (new_mtu < PE_MIN_MTU || new_mtu > PE_MAX_MTU) + return -EINVAL; + + running = netif_running(dev); + + if (running) { + /* Need to stop the interface, clean out all already + * received buffers, free all unused buffers on the RX + * interface ring, then finally re-fill the rx ring with + * the new-size buffers and restart. + */ + + napi_disable(&mac->napi); + netif_tx_disable(dev); + pasemi_mac_intf_disable(mac); + + rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if)); + pasemi_mac_pause_rxint(mac); + pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE); + pasemi_mac_free_rx_buffers(mac); + + } + + /* Setup checksum channels if large MTU and none already allocated */ + if (new_mtu > 1500 && !mac->num_cs) { + pasemi_mac_setup_csrings(mac); + if (!mac->num_cs) { + ret = -ENOMEM; + goto out; + } + } + + /* Change maxf, i.e. what size frames are accepted. + * Need room for ethernet header and CRC word + */ + reg = read_mac_reg(mac, PAS_MAC_CFG_MACCFG); + reg &= ~PAS_MAC_CFG_MACCFG_MAXF_M; + reg |= PAS_MAC_CFG_MACCFG_MAXF(new_mtu + ETH_HLEN + 4); + write_mac_reg(mac, PAS_MAC_CFG_MACCFG, reg); + + dev->mtu = new_mtu; + /* MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */ + mac->bufsz = new_mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128; + +out: + if (running) { + write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), + rcmdsta | PAS_DMA_RXINT_RCMDSTA_EN); + + rx_ring(mac)->next_to_fill = 0; + pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE-1); + + napi_enable(&mac->napi); + netif_start_queue(dev); + pasemi_mac_intf_enable(mac); + } + + return ret; +} + +static const struct net_device_ops pasemi_netdev_ops = { + .ndo_open = pasemi_mac_open, + .ndo_stop = pasemi_mac_close, + .ndo_start_xmit = pasemi_mac_start_tx, + .ndo_set_rx_mode = pasemi_mac_set_rx_mode, + .ndo_set_mac_address = pasemi_mac_set_mac_addr, + .ndo_change_mtu = pasemi_mac_change_mtu, + .ndo_validate_addr = eth_validate_addr, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = pasemi_mac_netpoll, +#endif +}; + +static int +pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct net_device *dev; + struct pasemi_mac *mac; + int err, ret; + + err = pci_enable_device(pdev); + if (err) + return err; + + dev = alloc_etherdev(sizeof(struct pasemi_mac)); + if (dev == NULL) { + err = -ENOMEM; + goto out_disable_device; + } + + pci_set_drvdata(pdev, dev); + SET_NETDEV_DEV(dev, &pdev->dev); + + mac = netdev_priv(dev); + + mac->pdev = pdev; + mac->netdev = dev; + + netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64); + + dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG | + NETIF_F_HIGHDMA | NETIF_F_GSO; + + mac->lro_mgr.max_aggr = LRO_MAX_AGGR; + mac->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS; + mac->lro_mgr.lro_arr = mac->lro_desc; + mac->lro_mgr.get_skb_header = get_skb_hdr; + mac->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID; + mac->lro_mgr.dev = mac->netdev; + mac->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY; + mac->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY; + + + mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL); + if (!mac->dma_pdev) { + dev_err(&mac->pdev->dev, "Can't find DMA Controller\n"); + err = -ENODEV; + goto out; + } + + mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL); + if (!mac->iob_pdev) { + dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n"); + err = -ENODEV; + goto out; + } + + /* get mac addr from device tree */ + if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) { + err = -ENODEV; + goto out; + } + memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr)); + + ret = mac_to_intf(mac); + if (ret < 0) { + dev_err(&mac->pdev->dev, "Can't map DMA interface\n"); + err = -ENODEV; + goto out; + } + mac->dma_if = ret; + + switch (pdev->device) { + case 0xa005: + mac->type = MAC_TYPE_GMAC; + break; + case 0xa006: + mac->type = MAC_TYPE_XAUI; + break; + default: + err = -ENODEV; + goto out; + } + + dev->netdev_ops = &pasemi_netdev_ops; + dev->mtu = PE_DEF_MTU; + /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */ + mac->bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128; + + dev->ethtool_ops = &pasemi_mac_ethtool_ops; + + if (err) + goto out; + + mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE); + + /* Enable most messages by default */ + mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1; + + err = register_netdev(dev); + + if (err) { + dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n", + err); + goto out; + } else if (netif_msg_probe(mac)) { + printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %pM\n", + dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI", + mac->dma_if, dev->dev_addr); + } + + return err; + +out: + pci_dev_put(mac->iob_pdev); + pci_dev_put(mac->dma_pdev); + + free_netdev(dev); +out_disable_device: + pci_disable_device(pdev); + return err; + +} + +static void pasemi_mac_remove(struct pci_dev *pdev) +{ + struct net_device *netdev = pci_get_drvdata(pdev); + struct pasemi_mac *mac; + + if (!netdev) + return; + + mac = netdev_priv(netdev); + + unregister_netdev(netdev); + + pci_disable_device(pdev); + pci_dev_put(mac->dma_pdev); + pci_dev_put(mac->iob_pdev); + + pasemi_dma_free_chan(&mac->tx->chan); + pasemi_dma_free_chan(&mac->rx->chan); + + free_netdev(netdev); +} + +static const struct pci_device_id pasemi_mac_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) }, + { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) }, + { }, +}; + +MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl); + +static struct pci_driver pasemi_mac_driver = { + .name = "pasemi_mac", + .id_table = pasemi_mac_pci_tbl, + .probe = pasemi_mac_probe, + .remove = pasemi_mac_remove, +}; + +static void __exit pasemi_mac_cleanup_module(void) +{ + pci_unregister_driver(&pasemi_mac_driver); +} + +int pasemi_mac_init_module(void) +{ + int err; + + err = pasemi_dma_init(); + if (err) + return err; + + return pci_register_driver(&pasemi_mac_driver); +} + +module_init(pasemi_mac_init_module); +module_exit(pasemi_mac_cleanup_module); |