| /* |
| * Driver for Xilinx TEMAC Ethernet device |
| * |
| * Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi |
| * Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net> |
| * Copyright (c) 2008-2009 Secret Lab Technologies Ltd. |
| * |
| * This is a driver for the Xilinx ll_temac ipcore which is often used |
| * in the Virtex and Spartan series of chips. |
| * |
| * Notes: |
| * - The ll_temac hardware uses indirect access for many of the TEMAC |
| * registers, include the MDIO bus. However, indirect access to MDIO |
| * registers take considerably more clock cycles than to TEMAC registers. |
| * MDIO accesses are long, so threads doing them should probably sleep |
| * rather than busywait. However, since only one indirect access can be |
| * in progress at any given time, that means that *all* indirect accesses |
| * could end up sleeping (to wait for an MDIO access to complete). |
| * Fortunately none of the indirect accesses are on the 'hot' path for tx |
| * or rx, so this should be okay. |
| * |
| * TODO: |
| * - Factor out locallink DMA code into separate driver |
| * - Fix multicast assignment. |
| * - Fix support for hardware checksumming. |
| * - Testing. Lots and lots of testing. |
| * |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/etherdevice.h> |
| #include <linux/mii.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/netdevice.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_mdio.h> |
| #include <linux/of_net.h> |
| #include <linux/of_platform.h> |
| #include <linux/of_address.h> |
| #include <linux/skbuff.h> |
| #include <linux/spinlock.h> |
| #include <linux/tcp.h> /* needed for sizeof(tcphdr) */ |
| #include <linux/udp.h> /* needed for sizeof(udphdr) */ |
| #include <linux/phy.h> |
| #include <linux/in.h> |
| #include <linux/io.h> |
| #include <linux/ip.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "ll_temac.h" |
| |
| #define TX_BD_NUM 64 |
| #define RX_BD_NUM 128 |
| |
| /* --------------------------------------------------------------------- |
| * Low level register access functions |
| */ |
| |
| u32 temac_ior(struct temac_local *lp, int offset) |
| { |
| return in_be32(lp->regs + offset); |
| } |
| |
| void temac_iow(struct temac_local *lp, int offset, u32 value) |
| { |
| out_be32(lp->regs + offset, value); |
| } |
| |
| int temac_indirect_busywait(struct temac_local *lp) |
| { |
| unsigned long end = jiffies + 2; |
| |
| while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) { |
| if (time_before_eq(end, jiffies)) { |
| WARN_ON(1); |
| return -ETIMEDOUT; |
| } |
| msleep(1); |
| } |
| return 0; |
| } |
| |
| /** |
| * temac_indirect_in32 |
| * |
| * lp->indirect_mutex must be held when calling this function |
| */ |
| u32 temac_indirect_in32(struct temac_local *lp, int reg) |
| { |
| u32 val; |
| |
| if (temac_indirect_busywait(lp)) |
| return -ETIMEDOUT; |
| temac_iow(lp, XTE_CTL0_OFFSET, reg); |
| if (temac_indirect_busywait(lp)) |
| return -ETIMEDOUT; |
| val = temac_ior(lp, XTE_LSW0_OFFSET); |
| |
| return val; |
| } |
| |
| /** |
| * temac_indirect_out32 |
| * |
| * lp->indirect_mutex must be held when calling this function |
| */ |
| void temac_indirect_out32(struct temac_local *lp, int reg, u32 value) |
| { |
| if (temac_indirect_busywait(lp)) |
| return; |
| temac_iow(lp, XTE_LSW0_OFFSET, value); |
| temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg); |
| temac_indirect_busywait(lp); |
| } |
| |
| /** |
| * temac_dma_in32 - Memory mapped DMA read, this function expects a |
| * register input that is based on DCR word addresses which |
| * are then converted to memory mapped byte addresses |
| */ |
| static u32 temac_dma_in32(struct temac_local *lp, int reg) |
| { |
| return in_be32(lp->sdma_regs + (reg << 2)); |
| } |
| |
| /** |
| * temac_dma_out32 - Memory mapped DMA read, this function expects a |
| * register input that is based on DCR word addresses which |
| * are then converted to memory mapped byte addresses |
| */ |
| static void temac_dma_out32(struct temac_local *lp, int reg, u32 value) |
| { |
| out_be32(lp->sdma_regs + (reg << 2), value); |
| } |
| |
| /* DMA register access functions can be DCR based or memory mapped. |
| * The PowerPC 440 is DCR based, the PowerPC 405 and MicroBlaze are both |
| * memory mapped. |
| */ |
| #ifdef CONFIG_PPC_DCR |
| |
| /** |
| * temac_dma_dcr_in32 - DCR based DMA read |
| */ |
| static u32 temac_dma_dcr_in(struct temac_local *lp, int reg) |
| { |
| return dcr_read(lp->sdma_dcrs, reg); |
| } |
| |
| /** |
| * temac_dma_dcr_out32 - DCR based DMA write |
| */ |
| static void temac_dma_dcr_out(struct temac_local *lp, int reg, u32 value) |
| { |
| dcr_write(lp->sdma_dcrs, reg, value); |
| } |
| |
| /** |
| * temac_dcr_setup - If the DMA is DCR based, then setup the address and |
| * I/O functions |
| */ |
| static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op, |
| struct device_node *np) |
| { |
| unsigned int dcrs; |
| |
| /* setup the dcr address mapping if it's in the device tree */ |
| |
| dcrs = dcr_resource_start(np, 0); |
| if (dcrs != 0) { |
| lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0)); |
| lp->dma_in = temac_dma_dcr_in; |
| lp->dma_out = temac_dma_dcr_out; |
| dev_dbg(&op->dev, "DCR base: %x\n", dcrs); |
| return 0; |
| } |
| /* no DCR in the device tree, indicate a failure */ |
| return -1; |
| } |
| |
| #else |
| |
| /* |
| * temac_dcr_setup - This is a stub for when DCR is not supported, |
| * such as with MicroBlaze |
| */ |
| static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op, |
| struct device_node *np) |
| { |
| return -1; |
| } |
| |
| #endif |
| |
| /** |
| * temac_dma_bd_release - Release buffer descriptor rings |
| */ |
| static void temac_dma_bd_release(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| int i; |
| |
| /* Reset Local Link (DMA) */ |
| lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST); |
| |
| for (i = 0; i < RX_BD_NUM; i++) { |
| if (!lp->rx_skb[i]) |
| break; |
| else { |
| dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys, |
| XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE); |
| dev_kfree_skb(lp->rx_skb[i]); |
| } |
| } |
| if (lp->rx_bd_v) |
| dma_free_coherent(ndev->dev.parent, |
| sizeof(*lp->rx_bd_v) * RX_BD_NUM, |
| lp->rx_bd_v, lp->rx_bd_p); |
| if (lp->tx_bd_v) |
| dma_free_coherent(ndev->dev.parent, |
| sizeof(*lp->tx_bd_v) * TX_BD_NUM, |
| lp->tx_bd_v, lp->tx_bd_p); |
| kfree(lp->rx_skb); |
| } |
| |
| /** |
| * temac_dma_bd_init - Setup buffer descriptor rings |
| */ |
| static int temac_dma_bd_init(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct sk_buff *skb; |
| int i; |
| |
| lp->rx_skb = kcalloc(RX_BD_NUM, sizeof(*lp->rx_skb), GFP_KERNEL); |
| if (!lp->rx_skb) |
| goto out; |
| |
| /* allocate the tx and rx ring buffer descriptors. */ |
| /* returns a virtual address and a physical address. */ |
| lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent, |
| sizeof(*lp->tx_bd_v) * TX_BD_NUM, |
| &lp->tx_bd_p, GFP_KERNEL); |
| if (!lp->tx_bd_v) |
| goto out; |
| |
| lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent, |
| sizeof(*lp->rx_bd_v) * RX_BD_NUM, |
| &lp->rx_bd_p, GFP_KERNEL); |
| if (!lp->rx_bd_v) |
| goto out; |
| |
| for (i = 0; i < TX_BD_NUM; i++) { |
| lp->tx_bd_v[i].next = lp->tx_bd_p + |
| sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM); |
| } |
| |
| for (i = 0; i < RX_BD_NUM; i++) { |
| lp->rx_bd_v[i].next = lp->rx_bd_p + |
| sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM); |
| |
| skb = netdev_alloc_skb_ip_align(ndev, |
| XTE_MAX_JUMBO_FRAME_SIZE); |
| if (!skb) |
| goto out; |
| |
| lp->rx_skb[i] = skb; |
| /* returns physical address of skb->data */ |
| lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent, |
| skb->data, |
| XTE_MAX_JUMBO_FRAME_SIZE, |
| DMA_FROM_DEVICE); |
| lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE; |
| lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND; |
| } |
| |
| lp->dma_out(lp, TX_CHNL_CTRL, 0x10220400 | |
| CHNL_CTRL_IRQ_EN | |
| CHNL_CTRL_IRQ_DLY_EN | |
| CHNL_CTRL_IRQ_COAL_EN); |
| /* 0x10220483 */ |
| /* 0x00100483 */ |
| lp->dma_out(lp, RX_CHNL_CTRL, 0xff070000 | |
| CHNL_CTRL_IRQ_EN | |
| CHNL_CTRL_IRQ_DLY_EN | |
| CHNL_CTRL_IRQ_COAL_EN | |
| CHNL_CTRL_IRQ_IOE); |
| /* 0xff010283 */ |
| |
| lp->dma_out(lp, RX_CURDESC_PTR, lp->rx_bd_p); |
| lp->dma_out(lp, RX_TAILDESC_PTR, |
| lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1))); |
| lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p); |
| |
| /* Init descriptor indexes */ |
| lp->tx_bd_ci = 0; |
| lp->tx_bd_next = 0; |
| lp->tx_bd_tail = 0; |
| lp->rx_bd_ci = 0; |
| |
| return 0; |
| |
| out: |
| temac_dma_bd_release(ndev); |
| return -ENOMEM; |
| } |
| |
| /* --------------------------------------------------------------------- |
| * net_device_ops |
| */ |
| |
| static void temac_do_set_mac_address(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| |
| /* set up unicast MAC address filter set its mac address */ |
| mutex_lock(&lp->indirect_mutex); |
| temac_indirect_out32(lp, XTE_UAW0_OFFSET, |
| (ndev->dev_addr[0]) | |
| (ndev->dev_addr[1] << 8) | |
| (ndev->dev_addr[2] << 16) | |
| (ndev->dev_addr[3] << 24)); |
| /* There are reserved bits in EUAW1 |
| * so don't affect them Set MAC bits [47:32] in EUAW1 */ |
| temac_indirect_out32(lp, XTE_UAW1_OFFSET, |
| (ndev->dev_addr[4] & 0x000000ff) | |
| (ndev->dev_addr[5] << 8)); |
| mutex_unlock(&lp->indirect_mutex); |
| } |
| |
| static int temac_init_mac_address(struct net_device *ndev, const void *address) |
| { |
| memcpy(ndev->dev_addr, address, ETH_ALEN); |
| if (!is_valid_ether_addr(ndev->dev_addr)) |
| eth_hw_addr_random(ndev); |
| temac_do_set_mac_address(ndev); |
| return 0; |
| } |
| |
| static int temac_set_mac_address(struct net_device *ndev, void *p) |
| { |
| struct sockaddr *addr = p; |
| |
| if (!is_valid_ether_addr(addr->sa_data)) |
| return -EADDRNOTAVAIL; |
| memcpy(ndev->dev_addr, addr->sa_data, ETH_ALEN); |
| temac_do_set_mac_address(ndev); |
| return 0; |
| } |
| |
| static void temac_set_multicast_list(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| u32 multi_addr_msw, multi_addr_lsw, val; |
| int i; |
| |
| mutex_lock(&lp->indirect_mutex); |
| if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) || |
| netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) { |
| /* |
| * We must make the kernel realise we had to move |
| * into promisc mode or we start all out war on |
| * the cable. If it was a promisc request the |
| * flag is already set. If not we assert it. |
| */ |
| ndev->flags |= IFF_PROMISC; |
| temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK); |
| dev_info(&ndev->dev, "Promiscuous mode enabled.\n"); |
| } else if (!netdev_mc_empty(ndev)) { |
| struct netdev_hw_addr *ha; |
| |
| i = 0; |
| netdev_for_each_mc_addr(ha, ndev) { |
| if (i >= MULTICAST_CAM_TABLE_NUM) |
| break; |
| multi_addr_msw = ((ha->addr[3] << 24) | |
| (ha->addr[2] << 16) | |
| (ha->addr[1] << 8) | |
| (ha->addr[0])); |
| temac_indirect_out32(lp, XTE_MAW0_OFFSET, |
| multi_addr_msw); |
| multi_addr_lsw = ((ha->addr[5] << 8) | |
| (ha->addr[4]) | (i << 16)); |
| temac_indirect_out32(lp, XTE_MAW1_OFFSET, |
| multi_addr_lsw); |
| i++; |
| } |
| } else { |
| val = temac_indirect_in32(lp, XTE_AFM_OFFSET); |
| temac_indirect_out32(lp, XTE_AFM_OFFSET, |
| val & ~XTE_AFM_EPPRM_MASK); |
| temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0); |
| temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0); |
| dev_info(&ndev->dev, "Promiscuous mode disabled.\n"); |
| } |
| mutex_unlock(&lp->indirect_mutex); |
| } |
| |
| static struct temac_option { |
| int flg; |
| u32 opt; |
| u32 reg; |
| u32 m_or; |
| u32 m_and; |
| } temac_options[] = { |
| /* Turn on jumbo packet support for both Rx and Tx */ |
| { |
| .opt = XTE_OPTION_JUMBO, |
| .reg = XTE_TXC_OFFSET, |
| .m_or = XTE_TXC_TXJMBO_MASK, |
| }, |
| { |
| .opt = XTE_OPTION_JUMBO, |
| .reg = XTE_RXC1_OFFSET, |
| .m_or =XTE_RXC1_RXJMBO_MASK, |
| }, |
| /* Turn on VLAN packet support for both Rx and Tx */ |
| { |
| .opt = XTE_OPTION_VLAN, |
| .reg = XTE_TXC_OFFSET, |
| .m_or =XTE_TXC_TXVLAN_MASK, |
| }, |
| { |
| .opt = XTE_OPTION_VLAN, |
| .reg = XTE_RXC1_OFFSET, |
| .m_or =XTE_RXC1_RXVLAN_MASK, |
| }, |
| /* Turn on FCS stripping on receive packets */ |
| { |
| .opt = XTE_OPTION_FCS_STRIP, |
| .reg = XTE_RXC1_OFFSET, |
| .m_or =XTE_RXC1_RXFCS_MASK, |
| }, |
| /* Turn on FCS insertion on transmit packets */ |
| { |
| .opt = XTE_OPTION_FCS_INSERT, |
| .reg = XTE_TXC_OFFSET, |
| .m_or =XTE_TXC_TXFCS_MASK, |
| }, |
| /* Turn on length/type field checking on receive packets */ |
| { |
| .opt = XTE_OPTION_LENTYPE_ERR, |
| .reg = XTE_RXC1_OFFSET, |
| .m_or =XTE_RXC1_RXLT_MASK, |
| }, |
| /* Turn on flow control */ |
| { |
| .opt = XTE_OPTION_FLOW_CONTROL, |
| .reg = XTE_FCC_OFFSET, |
| .m_or =XTE_FCC_RXFLO_MASK, |
| }, |
| /* Turn on flow control */ |
| { |
| .opt = XTE_OPTION_FLOW_CONTROL, |
| .reg = XTE_FCC_OFFSET, |
| .m_or =XTE_FCC_TXFLO_MASK, |
| }, |
| /* Turn on promiscuous frame filtering (all frames are received ) */ |
| { |
| .opt = XTE_OPTION_PROMISC, |
| .reg = XTE_AFM_OFFSET, |
| .m_or =XTE_AFM_EPPRM_MASK, |
| }, |
| /* Enable transmitter if not already enabled */ |
| { |
| .opt = XTE_OPTION_TXEN, |
| .reg = XTE_TXC_OFFSET, |
| .m_or =XTE_TXC_TXEN_MASK, |
| }, |
| /* Enable receiver? */ |
| { |
| .opt = XTE_OPTION_RXEN, |
| .reg = XTE_RXC1_OFFSET, |
| .m_or =XTE_RXC1_RXEN_MASK, |
| }, |
| {} |
| }; |
| |
| /** |
| * temac_setoptions |
| */ |
| static u32 temac_setoptions(struct net_device *ndev, u32 options) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct temac_option *tp = &temac_options[0]; |
| int reg; |
| |
| mutex_lock(&lp->indirect_mutex); |
| while (tp->opt) { |
| reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or; |
| if (options & tp->opt) |
| reg |= tp->m_or; |
| temac_indirect_out32(lp, tp->reg, reg); |
| tp++; |
| } |
| lp->options |= options; |
| mutex_unlock(&lp->indirect_mutex); |
| |
| return 0; |
| } |
| |
| /* Initialize temac */ |
| static void temac_device_reset(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| u32 timeout; |
| u32 val; |
| |
| /* Perform a software reset */ |
| |
| /* 0x300 host enable bit ? */ |
| /* reset PHY through control register ?:1 */ |
| |
| dev_dbg(&ndev->dev, "%s()\n", __func__); |
| |
| mutex_lock(&lp->indirect_mutex); |
| /* Reset the receiver and wait for it to finish reset */ |
| temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK); |
| timeout = 1000; |
| while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) { |
| udelay(1); |
| if (--timeout == 0) { |
| dev_err(&ndev->dev, |
| "temac_device_reset RX reset timeout!!\n"); |
| break; |
| } |
| } |
| |
| /* Reset the transmitter and wait for it to finish reset */ |
| temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK); |
| timeout = 1000; |
| while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) { |
| udelay(1); |
| if (--timeout == 0) { |
| dev_err(&ndev->dev, |
| "temac_device_reset TX reset timeout!!\n"); |
| break; |
| } |
| } |
| |
| /* Disable the receiver */ |
| val = temac_indirect_in32(lp, XTE_RXC1_OFFSET); |
| temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK); |
| |
| /* Reset Local Link (DMA) */ |
| lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST); |
| timeout = 1000; |
| while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) { |
| udelay(1); |
| if (--timeout == 0) { |
| dev_err(&ndev->dev, |
| "temac_device_reset DMA reset timeout!!\n"); |
| break; |
| } |
| } |
| lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE); |
| |
| if (temac_dma_bd_init(ndev)) { |
| dev_err(&ndev->dev, |
| "temac_device_reset descriptor allocation failed\n"); |
| } |
| |
| temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0); |
| temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0); |
| temac_indirect_out32(lp, XTE_TXC_OFFSET, 0); |
| temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK); |
| |
| mutex_unlock(&lp->indirect_mutex); |
| |
| /* Sync default options with HW |
| * but leave receiver and transmitter disabled. */ |
| temac_setoptions(ndev, |
| lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN)); |
| |
| temac_do_set_mac_address(ndev); |
| |
| /* Set address filter table */ |
| temac_set_multicast_list(ndev); |
| if (temac_setoptions(ndev, lp->options)) |
| dev_err(&ndev->dev, "Error setting TEMAC options\n"); |
| |
| /* Init Driver variable */ |
| netif_trans_update(ndev); /* prevent tx timeout */ |
| } |
| |
| static void temac_adjust_link(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct phy_device *phy = ndev->phydev; |
| u32 mii_speed; |
| int link_state; |
| |
| /* hash together the state values to decide if something has changed */ |
| link_state = phy->speed | (phy->duplex << 1) | phy->link; |
| |
| mutex_lock(&lp->indirect_mutex); |
| if (lp->last_link != link_state) { |
| mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET); |
| mii_speed &= ~XTE_EMCFG_LINKSPD_MASK; |
| |
| switch (phy->speed) { |
| case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break; |
| case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break; |
| case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break; |
| } |
| |
| /* Write new speed setting out to TEMAC */ |
| temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed); |
| lp->last_link = link_state; |
| phy_print_status(phy); |
| } |
| mutex_unlock(&lp->indirect_mutex); |
| } |
| |
| static void temac_start_xmit_done(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct cdmac_bd *cur_p; |
| unsigned int stat = 0; |
| |
| cur_p = &lp->tx_bd_v[lp->tx_bd_ci]; |
| stat = cur_p->app0; |
| |
| while (stat & STS_CTRL_APP0_CMPLT) { |
| dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len, |
| DMA_TO_DEVICE); |
| if (cur_p->app4) |
| dev_consume_skb_irq((struct sk_buff *)cur_p->app4); |
| cur_p->app0 = 0; |
| cur_p->app1 = 0; |
| cur_p->app2 = 0; |
| cur_p->app3 = 0; |
| cur_p->app4 = 0; |
| |
| ndev->stats.tx_packets++; |
| ndev->stats.tx_bytes += cur_p->len; |
| |
| lp->tx_bd_ci++; |
| if (lp->tx_bd_ci >= TX_BD_NUM) |
| lp->tx_bd_ci = 0; |
| |
| cur_p = &lp->tx_bd_v[lp->tx_bd_ci]; |
| stat = cur_p->app0; |
| } |
| |
| netif_wake_queue(ndev); |
| } |
| |
| static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag) |
| { |
| struct cdmac_bd *cur_p; |
| int tail; |
| |
| tail = lp->tx_bd_tail; |
| cur_p = &lp->tx_bd_v[tail]; |
| |
| do { |
| if (cur_p->app0) |
| return NETDEV_TX_BUSY; |
| |
| tail++; |
| if (tail >= TX_BD_NUM) |
| tail = 0; |
| |
| cur_p = &lp->tx_bd_v[tail]; |
| num_frag--; |
| } while (num_frag >= 0); |
| |
| return 0; |
| } |
| |
| static netdev_tx_t |
| temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct cdmac_bd *cur_p; |
| dma_addr_t start_p, tail_p; |
| int ii; |
| unsigned long num_frag; |
| skb_frag_t *frag; |
| |
| num_frag = skb_shinfo(skb)->nr_frags; |
| frag = &skb_shinfo(skb)->frags[0]; |
| start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail; |
| cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; |
| |
| if (temac_check_tx_bd_space(lp, num_frag)) { |
| if (!netif_queue_stopped(ndev)) |
| netif_stop_queue(ndev); |
| return NETDEV_TX_BUSY; |
| } |
| |
| cur_p->app0 = 0; |
| if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| unsigned int csum_start_off = skb_checksum_start_offset(skb); |
| unsigned int csum_index_off = csum_start_off + skb->csum_offset; |
| |
| cur_p->app0 |= 1; /* TX Checksum Enabled */ |
| cur_p->app1 = (csum_start_off << 16) | csum_index_off; |
| cur_p->app2 = 0; /* initial checksum seed */ |
| } |
| |
| cur_p->app0 |= STS_CTRL_APP0_SOP; |
| cur_p->len = skb_headlen(skb); |
| cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, |
| skb_headlen(skb), DMA_TO_DEVICE); |
| cur_p->app4 = (unsigned long)skb; |
| |
| for (ii = 0; ii < num_frag; ii++) { |
| lp->tx_bd_tail++; |
| if (lp->tx_bd_tail >= TX_BD_NUM) |
| lp->tx_bd_tail = 0; |
| |
| cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; |
| cur_p->phys = dma_map_single(ndev->dev.parent, |
| skb_frag_address(frag), |
| skb_frag_size(frag), DMA_TO_DEVICE); |
| cur_p->len = skb_frag_size(frag); |
| cur_p->app0 = 0; |
| frag++; |
| } |
| cur_p->app0 |= STS_CTRL_APP0_EOP; |
| |
| tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail; |
| lp->tx_bd_tail++; |
| if (lp->tx_bd_tail >= TX_BD_NUM) |
| lp->tx_bd_tail = 0; |
| |
| skb_tx_timestamp(skb); |
| |
| /* Kick off the transfer */ |
| lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */ |
| |
| return NETDEV_TX_OK; |
| } |
| |
| |
| static void ll_temac_recv(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct sk_buff *skb, *new_skb; |
| unsigned int bdstat; |
| struct cdmac_bd *cur_p; |
| dma_addr_t tail_p; |
| int length; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&lp->rx_lock, flags); |
| |
| tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci; |
| cur_p = &lp->rx_bd_v[lp->rx_bd_ci]; |
| |
| bdstat = cur_p->app0; |
| while ((bdstat & STS_CTRL_APP0_CMPLT)) { |
| |
| skb = lp->rx_skb[lp->rx_bd_ci]; |
| length = cur_p->app4 & 0x3FFF; |
| |
| dma_unmap_single(ndev->dev.parent, cur_p->phys, length, |
| DMA_FROM_DEVICE); |
| |
| skb_put(skb, length); |
| skb->protocol = eth_type_trans(skb, ndev); |
| skb_checksum_none_assert(skb); |
| |
| /* if we're doing rx csum offload, set it up */ |
| if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) && |
| (skb->protocol == htons(ETH_P_IP)) && |
| (skb->len > 64)) { |
| |
| skb->csum = cur_p->app3 & 0xFFFF; |
| skb->ip_summed = CHECKSUM_COMPLETE; |
| } |
| |
| if (!skb_defer_rx_timestamp(skb)) |
| netif_rx(skb); |
| |
| ndev->stats.rx_packets++; |
| ndev->stats.rx_bytes += length; |
| |
| new_skb = netdev_alloc_skb_ip_align(ndev, |
| XTE_MAX_JUMBO_FRAME_SIZE); |
| if (!new_skb) { |
| spin_unlock_irqrestore(&lp->rx_lock, flags); |
| return; |
| } |
| |
| cur_p->app0 = STS_CTRL_APP0_IRQONEND; |
| cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data, |
| XTE_MAX_JUMBO_FRAME_SIZE, |
| DMA_FROM_DEVICE); |
| cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE; |
| lp->rx_skb[lp->rx_bd_ci] = new_skb; |
| |
| lp->rx_bd_ci++; |
| if (lp->rx_bd_ci >= RX_BD_NUM) |
| lp->rx_bd_ci = 0; |
| |
| cur_p = &lp->rx_bd_v[lp->rx_bd_ci]; |
| bdstat = cur_p->app0; |
| } |
| lp->dma_out(lp, RX_TAILDESC_PTR, tail_p); |
| |
| spin_unlock_irqrestore(&lp->rx_lock, flags); |
| } |
| |
| static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev) |
| { |
| struct net_device *ndev = _ndev; |
| struct temac_local *lp = netdev_priv(ndev); |
| unsigned int status; |
| |
| status = lp->dma_in(lp, TX_IRQ_REG); |
| lp->dma_out(lp, TX_IRQ_REG, status); |
| |
| if (status & (IRQ_COAL | IRQ_DLY)) |
| temac_start_xmit_done(lp->ndev); |
| if (status & 0x080) |
| dev_err(&ndev->dev, "DMA error 0x%x\n", status); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev) |
| { |
| struct net_device *ndev = _ndev; |
| struct temac_local *lp = netdev_priv(ndev); |
| unsigned int status; |
| |
| /* Read and clear the status registers */ |
| status = lp->dma_in(lp, RX_IRQ_REG); |
| lp->dma_out(lp, RX_IRQ_REG, status); |
| |
| if (status & (IRQ_COAL | IRQ_DLY)) |
| ll_temac_recv(lp->ndev); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int temac_open(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct phy_device *phydev = NULL; |
| int rc; |
| |
| dev_dbg(&ndev->dev, "temac_open()\n"); |
| |
| if (lp->phy_node) { |
| phydev = of_phy_connect(lp->ndev, lp->phy_node, |
| temac_adjust_link, 0, 0); |
| if (!phydev) { |
| dev_err(lp->dev, "of_phy_connect() failed\n"); |
| return -ENODEV; |
| } |
| |
| phy_start(phydev); |
| } |
| |
| temac_device_reset(ndev); |
| |
| rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev); |
| if (rc) |
| goto err_tx_irq; |
| rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev); |
| if (rc) |
| goto err_rx_irq; |
| |
| return 0; |
| |
| err_rx_irq: |
| free_irq(lp->tx_irq, ndev); |
| err_tx_irq: |
| if (phydev) |
| phy_disconnect(phydev); |
| dev_err(lp->dev, "request_irq() failed\n"); |
| return rc; |
| } |
| |
| static int temac_stop(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| struct phy_device *phydev = ndev->phydev; |
| |
| dev_dbg(&ndev->dev, "temac_close()\n"); |
| |
| free_irq(lp->tx_irq, ndev); |
| free_irq(lp->rx_irq, ndev); |
| |
| if (phydev) |
| phy_disconnect(phydev); |
| |
| temac_dma_bd_release(ndev); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| static void |
| temac_poll_controller(struct net_device *ndev) |
| { |
| struct temac_local *lp = netdev_priv(ndev); |
| |
| disable_irq(lp->tx_irq); |
| disable_irq(lp->rx_irq); |
| |
| ll_temac_rx_irq(lp->tx_irq, ndev); |
| ll_temac_tx_irq(lp->rx_irq, ndev); |
| |
| enable_irq(lp->tx_irq); |
| enable_irq(lp->rx_irq); |
| } |
| #endif |
| |
| static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd) |
| { |
| if (!netif_running(ndev)) |
| return -EINVAL; |
| |
| if (!ndev->phydev) |
| return -EINVAL; |
| |
| return phy_mii_ioctl(ndev->phydev, rq, cmd); |
| } |
| |
| static const struct net_device_ops temac_netdev_ops = { |
| .ndo_open = temac_open, |
| .ndo_stop = temac_stop, |
| .ndo_start_xmit = temac_start_xmit, |
| .ndo_set_mac_address = temac_set_mac_address, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_do_ioctl = temac_ioctl, |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| .ndo_poll_controller = temac_poll_controller, |
| #endif |
| }; |
| |
| /* --------------------------------------------------------------------- |
| * SYSFS device attributes |
| */ |
| static ssize_t temac_show_llink_regs(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *ndev = dev_get_drvdata(dev); |
| struct temac_local *lp = netdev_priv(ndev); |
| int i, len = 0; |
| |
| for (i = 0; i < 0x11; i++) |
| len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i), |
| (i % 8) == 7 ? "\n" : " "); |
| len += sprintf(buf + len, "\n"); |
| |
| return len; |
| } |
| |
| static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL); |
| |
| static struct attribute *temac_device_attrs[] = { |
| &dev_attr_llink_regs.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group temac_attr_group = { |
| .attrs = temac_device_attrs, |
| }; |
| |
| /* ethtool support */ |
| static const struct ethtool_ops temac_ethtool_ops = { |
| .nway_reset = phy_ethtool_nway_reset, |
| .get_link = ethtool_op_get_link, |
| .get_ts_info = ethtool_op_get_ts_info, |
| .get_link_ksettings = phy_ethtool_get_link_ksettings, |
| .set_link_ksettings = phy_ethtool_set_link_ksettings, |
| }; |
| |
| static int temac_of_probe(struct platform_device *op) |
| { |
| struct device_node *np; |
| struct temac_local *lp; |
| struct net_device *ndev; |
| const void *addr; |
| __be32 *p; |
| int rc = 0; |
| |
| /* Init network device structure */ |
| ndev = alloc_etherdev(sizeof(*lp)); |
| if (!ndev) |
| return -ENOMEM; |
| |
| platform_set_drvdata(op, ndev); |
| SET_NETDEV_DEV(ndev, &op->dev); |
| ndev->flags &= ~IFF_MULTICAST; /* clear multicast */ |
| ndev->features = NETIF_F_SG; |
| ndev->netdev_ops = &temac_netdev_ops; |
| ndev->ethtool_ops = &temac_ethtool_ops; |
| #if 0 |
| ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */ |
| ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */ |
| ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */ |
| ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */ |
| ndev->features |= NETIF_F_HW_VLAN_CTAG_TX; /* Transmit VLAN hw accel */ |
| ndev->features |= NETIF_F_HW_VLAN_CTAG_RX; /* Receive VLAN hw acceleration */ |
| ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; /* Receive VLAN filtering */ |
| ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */ |
| ndev->features |= NETIF_F_GSO; /* Enable software GSO. */ |
| ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */ |
| ndev->features |= NETIF_F_LRO; /* large receive offload */ |
| #endif |
| |
| /* setup temac private info structure */ |
| lp = netdev_priv(ndev); |
| lp->ndev = ndev; |
| lp->dev = &op->dev; |
| lp->options = XTE_OPTION_DEFAULTS; |
| spin_lock_init(&lp->rx_lock); |
| mutex_init(&lp->indirect_mutex); |
| |
| /* map device registers */ |
| lp->regs = of_iomap(op->dev.of_node, 0); |
| if (!lp->regs) { |
| dev_err(&op->dev, "could not map temac regs.\n"); |
| rc = -ENOMEM; |
| goto nodev; |
| } |
| |
| /* Setup checksum offload, but default to off if not specified */ |
| lp->temac_features = 0; |
| p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL); |
| if (p && be32_to_cpu(*p)) { |
| lp->temac_features |= TEMAC_FEATURE_TX_CSUM; |
| /* Can checksum TCP/UDP over IPv4. */ |
| ndev->features |= NETIF_F_IP_CSUM; |
| } |
| p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL); |
| if (p && be32_to_cpu(*p)) |
| lp->temac_features |= TEMAC_FEATURE_RX_CSUM; |
| |
| /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */ |
| np = of_parse_phandle(op->dev.of_node, "llink-connected", 0); |
| if (!np) { |
| dev_err(&op->dev, "could not find DMA node\n"); |
| rc = -ENODEV; |
| goto err_iounmap; |
| } |
| |
| /* Setup the DMA register accesses, could be DCR or memory mapped */ |
| if (temac_dcr_setup(lp, op, np)) { |
| |
| /* no DCR in the device tree, try non-DCR */ |
| lp->sdma_regs = of_iomap(np, 0); |
| if (lp->sdma_regs) { |
| lp->dma_in = temac_dma_in32; |
| lp->dma_out = temac_dma_out32; |
| dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs); |
| } else { |
| dev_err(&op->dev, "unable to map DMA registers\n"); |
| of_node_put(np); |
| goto err_iounmap; |
| } |
| } |
| |
| lp->rx_irq = irq_of_parse_and_map(np, 0); |
| lp->tx_irq = irq_of_parse_and_map(np, 1); |
| |
| of_node_put(np); /* Finished with the DMA node; drop the reference */ |
| |
| if (!lp->rx_irq || !lp->tx_irq) { |
| dev_err(&op->dev, "could not determine irqs\n"); |
| rc = -ENOMEM; |
| goto err_iounmap_2; |
| } |
| |
| |
| /* Retrieve the MAC address */ |
| addr = of_get_mac_address(op->dev.of_node); |
| if (!addr) { |
| dev_err(&op->dev, "could not find MAC address\n"); |
| rc = -ENODEV; |
| goto err_iounmap_2; |
| } |
| temac_init_mac_address(ndev, addr); |
| |
| rc = temac_mdio_setup(lp, op->dev.of_node); |
| if (rc) |
| dev_warn(&op->dev, "error registering MDIO bus\n"); |
| |
| lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0); |
| if (lp->phy_node) |
| dev_dbg(lp->dev, "using PHY node %pOF (%p)\n", np, np); |
| |
| /* Add the device attributes */ |
| rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group); |
| if (rc) { |
| dev_err(lp->dev, "Error creating sysfs files\n"); |
| goto err_iounmap_2; |
| } |
| |
| rc = register_netdev(lp->ndev); |
| if (rc) { |
| dev_err(lp->dev, "register_netdev() error (%i)\n", rc); |
| goto err_register_ndev; |
| } |
| |
| return 0; |
| |
| err_register_ndev: |
| sysfs_remove_group(&lp->dev->kobj, &temac_attr_group); |
| err_iounmap_2: |
| if (lp->sdma_regs) |
| iounmap(lp->sdma_regs); |
| err_iounmap: |
| iounmap(lp->regs); |
| nodev: |
| free_netdev(ndev); |
| ndev = NULL; |
| return rc; |
| } |
| |
| static int temac_of_remove(struct platform_device *op) |
| { |
| struct net_device *ndev = platform_get_drvdata(op); |
| struct temac_local *lp = netdev_priv(ndev); |
| |
| temac_mdio_teardown(lp); |
| unregister_netdev(ndev); |
| sysfs_remove_group(&lp->dev->kobj, &temac_attr_group); |
| of_node_put(lp->phy_node); |
| lp->phy_node = NULL; |
| iounmap(lp->regs); |
| if (lp->sdma_regs) |
| iounmap(lp->sdma_regs); |
| free_netdev(ndev); |
| return 0; |
| } |
| |
| static const struct of_device_id temac_of_match[] = { |
| { .compatible = "xlnx,xps-ll-temac-1.01.b", }, |
| { .compatible = "xlnx,xps-ll-temac-2.00.a", }, |
| { .compatible = "xlnx,xps-ll-temac-2.02.a", }, |
| { .compatible = "xlnx,xps-ll-temac-2.03.a", }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, temac_of_match); |
| |
| static struct platform_driver temac_of_driver = { |
| .probe = temac_of_probe, |
| .remove = temac_of_remove, |
| .driver = { |
| .name = "xilinx_temac", |
| .of_match_table = temac_of_match, |
| }, |
| }; |
| |
| module_platform_driver(temac_of_driver); |
| |
| MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver"); |
| MODULE_AUTHOR("Yoshio Kashiwagi"); |
| MODULE_LICENSE("GPL"); |