/* * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device. * * This is a new flat driver which is based on the original emac_lite * driver from John Williams <john.williams@petalogix.com>. * * 2007-2009 (c) Xilinx, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/uaccess.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/io.h> #include <linux/of_device.h> #include <linux/of_platform.h> #define DRIVER_NAME "xilinx_emaclite" /* Register offsets for the EmacLite Core */ #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */ #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */ #define XEL_TSR_OFFSET 0x07FC /* Tx status */ #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */ #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */ #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */ #define XEL_RSR_OFFSET 0x17FC /* Rx status */ #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */ /* Global Interrupt Enable Register (GIER) Bit Masks */ #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */ /* Transmit Status Register (TSR) Bit Masks */ #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */ #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */ #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */ #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit * only. This is not documented * in the HW spec */ /* Define for programming the MAC address into the EmacLite */ #define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK) /* Receive Status Register (RSR) */ #define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */ #define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */ /* Transmit Packet Length Register (TPLR) */ #define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */ /* Receive Packet Length Register (RPLR) */ #define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */ #define XEL_HEADER_OFFSET 12 /* Offset to length field */ #define XEL_HEADER_SHIFT 16 /* Shift value for length */ /* General Ethernet Definitions */ #define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */ #define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */ #define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */ #define ALIGNMENT 4 /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */ #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT) /** * struct net_local - Our private per device data * @ndev: instance of the network device * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW * @next_tx_buf_to_use: next Tx buffer to write to * @next_rx_buf_to_use: next Rx buffer to read from * @base_addr: base address of the Emaclite device * @reset_lock: lock used for synchronization * @deferred_skb: holds an skb (for transmission at a later time) when the * Tx buffer is not free */ struct net_local { struct net_device *ndev; bool tx_ping_pong; bool rx_ping_pong; u32 next_tx_buf_to_use; u32 next_rx_buf_to_use; void __iomem *base_addr; spinlock_t reset_lock; struct sk_buff *deferred_skb; }; /*************************/ /* EmacLite driver calls */ /*************************/ /** * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device * @drvdata: Pointer to the Emaclite device private data * * This function enables the Tx and Rx interrupts for the Emaclite device along * with the Global Interrupt Enable. */ static void xemaclite_enable_interrupts(struct net_local *drvdata) { u32 reg_data; /* Enable the Tx interrupts for the first Buffer */ reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); out_be32(drvdata->base_addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_XMIT_IE_MASK); /* Enable the Tx interrupts for the second Buffer if * configured in HW */ if (drvdata->tx_ping_pong != 0) { reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, reg_data | XEL_TSR_XMIT_IE_MASK); } /* Enable the Rx interrupts for the first buffer */ out_be32(drvdata->base_addr + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK); /* Enable the Rx interrupts for the second Buffer if * configured in HW */ if (drvdata->rx_ping_pong != 0) { out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK); } /* Enable the Global Interrupt Enable */ out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); } /** * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device * @drvdata: Pointer to the Emaclite device private data * * This function disables the Tx and Rx interrupts for the Emaclite device, * along with the Global Interrupt Enable. */ static void xemaclite_disable_interrupts(struct net_local *drvdata) { u32 reg_data; /* Disable the Global Interrupt Enable */ out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); /* Disable the Tx interrupts for the first buffer */ reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); out_be32(drvdata->base_addr + XEL_TSR_OFFSET, reg_data & (~XEL_TSR_XMIT_IE_MASK)); /* Disable the Tx interrupts for the second Buffer * if configured in HW */ if (drvdata->tx_ping_pong != 0) { reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, reg_data & (~XEL_TSR_XMIT_IE_MASK)); } /* Disable the Rx interrupts for the first buffer */ reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET); out_be32(drvdata->base_addr + XEL_RSR_OFFSET, reg_data & (~XEL_RSR_RECV_IE_MASK)); /* Disable the Rx interrupts for the second buffer * if configured in HW */ if (drvdata->rx_ping_pong != 0) { reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET); out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET, reg_data & (~XEL_RSR_RECV_IE_MASK)); } } /** * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address * @src_ptr: Void pointer to the 16-bit aligned source address * @dest_ptr: Pointer to the 32-bit aligned destination address * @length: Number bytes to write from source to destination * * This function writes data from a 16-bit aligned buffer to a 32-bit aligned * address in the EmacLite device. */ static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr, unsigned length) { u32 align_buffer; u32 *to_u32_ptr; u16 *from_u16_ptr, *to_u16_ptr; to_u32_ptr = dest_ptr; from_u16_ptr = (u16 *) src_ptr; align_buffer = 0; for (; length > 3; length -= 4) { to_u16_ptr = (u16 *) ((void *) &align_buffer); *to_u16_ptr++ = *from_u16_ptr++; *to_u16_ptr++ = *from_u16_ptr++; /* Output a word */ *to_u32_ptr++ = align_buffer; } if (length) { u8 *from_u8_ptr, *to_u8_ptr; /* Set up to output the remaining data */ align_buffer = 0; to_u8_ptr = (u8 *) &align_buffer; from_u8_ptr = (u8 *) from_u16_ptr; /* Output the remaining data */ for (; length > 0; length--) *to_u8_ptr++ = *from_u8_ptr++; *to_u32_ptr = align_buffer; } } /** * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer * @src_ptr: Pointer to the 32-bit aligned source address * @dest_ptr: Pointer to the 16-bit aligned destination address * @length: Number bytes to read from source to destination * * This function reads data from a 32-bit aligned address in the EmacLite device * to a 16-bit aligned buffer. */ static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr, unsigned length) { u16 *to_u16_ptr, *from_u16_ptr; u32 *from_u32_ptr; u32 align_buffer; from_u32_ptr = src_ptr; to_u16_ptr = (u16 *) dest_ptr; for (; length > 3; length -= 4) { /* Copy each word into the temporary buffer */ align_buffer = *from_u32_ptr++; from_u16_ptr = (u16 *)&align_buffer; /* Read data from source */ *to_u16_ptr++ = *from_u16_ptr++; *to_u16_ptr++ = *from_u16_ptr++; } if (length) { u8 *to_u8_ptr, *from_u8_ptr; /* Set up to read the remaining data */ to_u8_ptr = (u8 *) to_u16_ptr; align_buffer = *from_u32_ptr++; from_u8_ptr = (u8 *) &align_buffer; /* Read the remaining data */ for (; length > 0; length--) *to_u8_ptr = *from_u8_ptr; } } /** * xemaclite_send_data - Send an Ethernet frame * @drvdata: Pointer to the Emaclite device private data * @data: Pointer to the data to be sent * @byte_count: Total frame size, including header * * This function checks if the Tx buffer of the Emaclite device is free to send * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it * returns an error. * * Return: 0 upon success or -1 if the buffer(s) are full. * * Note: The maximum Tx packet size can not be more than Ethernet header * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS. */ static int xemaclite_send_data(struct net_local *drvdata, u8 *data, unsigned int byte_count) { u32 reg_data; void __iomem *addr; /* Determine the expected Tx buffer address */ addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; /* If the length is too large, truncate it */ if (byte_count > ETH_FRAME_LEN) byte_count = ETH_FRAME_LEN; /* Check if the expected buffer is available */ reg_data = in_be32(addr + XEL_TSR_OFFSET); if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK)) == 0) { /* Switch to next buffer if configured */ if (drvdata->tx_ping_pong != 0) drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET; } else if (drvdata->tx_ping_pong != 0) { /* If the expected buffer is full, try the other buffer, * if it is configured in HW */ addr = (void __iomem __force *)((u32 __force)addr ^ XEL_BUFFER_OFFSET); reg_data = in_be32(addr + XEL_TSR_OFFSET); if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK)) != 0) return -1; /* Buffers were full, return failure */ } else return -1; /* Buffer was full, return failure */ /* Write the frame to the buffer */ xemaclite_aligned_write(data, (u32 __force *) addr, byte_count); out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK)); /* Update the Tx Status Register to indicate that there is a * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which * is used by the interrupt handler to check whether a frame * has been transmitted */ reg_data = in_be32(addr + XEL_TSR_OFFSET); reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK); out_be32(addr + XEL_TSR_OFFSET, reg_data); return 0; } /** * xemaclite_recv_data - Receive a frame * @drvdata: Pointer to the Emaclite device private data * @data: Address where the data is to be received * * This function is intended to be called from the interrupt context or * with a wrapper which waits for the receive frame to be available. * * Return: Total number of bytes received */ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) { void __iomem *addr; u16 length, proto_type; u32 reg_data; /* Determine the expected buffer address */ addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use); /* Verify which buffer has valid data */ reg_data = in_be32(addr + XEL_RSR_OFFSET); if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { if (drvdata->rx_ping_pong != 0) drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET; } else { /* The instance is out of sync, try other buffer if other * buffer is configured, return 0 otherwise. If the instance is * out of sync, do not update the 'next_rx_buf_to_use' since it * will correct on subsequent calls */ if (drvdata->rx_ping_pong != 0) addr = (void __iomem __force *)((u32 __force)addr ^ XEL_BUFFER_OFFSET); else return 0; /* No data was available */ /* Verify that buffer has valid data */ reg_data = in_be32(addr + XEL_RSR_OFFSET); if ((reg_data & XEL_RSR_RECV_DONE_MASK) != XEL_RSR_RECV_DONE_MASK) return 0; /* No data was available */ } /* Get the protocol type of the ethernet frame that arrived */ proto_type = ((in_be32(addr + XEL_HEADER_OFFSET + XEL_RXBUFF_OFFSET) >> XEL_HEADER_SHIFT) & XEL_RPLR_LENGTH_MASK); /* Check if received ethernet frame is a raw ethernet frame * or an IP packet or an ARP packet */ if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) { if (proto_type == ETH_P_IP) { length = ((in_be32(addr + XEL_HEADER_IP_LENGTH_OFFSET + XEL_RXBUFF_OFFSET) >> XEL_HEADER_SHIFT) & XEL_RPLR_LENGTH_MASK); length += ETH_HLEN + ETH_FCS_LEN; } else if (proto_type == ETH_P_ARP) length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN; else /* Field contains type other than IP or ARP, use max * frame size and let user parse it */ length = ETH_FRAME_LEN + ETH_FCS_LEN; } else /* Use the length in the frame, plus the header and trailer */ length = proto_type + ETH_HLEN + ETH_FCS_LEN; /* Read from the EmacLite device */ xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET), data, length); /* Acknowledge the frame */ reg_data = in_be32(addr + XEL_RSR_OFFSET); reg_data &= ~XEL_RSR_RECV_DONE_MASK; out_be32(addr + XEL_RSR_OFFSET, reg_data); return length; } /** * xemaclite_set_mac_address - Set the MAC address for this device * @drvdata: Pointer to the Emaclite device private data * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value) * * Tx must be idle and Rx should be idle for deterministic results. * It is recommended that this function should be called after the * initialization and before transmission of any packets from the device. * The MAC address can be programmed using any of the two transmit * buffers (if configured). */ static void xemaclite_set_mac_address(struct net_local *drvdata, u8 *address_ptr) { void __iomem *addr; u32 reg_data; /* Determine the expected Tx buffer address */ addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN); out_be32(addr + XEL_TPLR_OFFSET, ETH_ALEN); /* Update the MAC address in the EmacLite */ reg_data = in_be32(addr + XEL_TSR_OFFSET); out_be32(addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_PROG_MAC_ADDR); /* Wait for EmacLite to finish with the MAC address update */ while ((in_be32(addr + XEL_TSR_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ; } /** * xemaclite_tx_timeout - Callback for Tx Timeout * @dev: Pointer to the network device * * This function is called when Tx time out occurs for Emaclite device. */ static void xemaclite_tx_timeout(struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); unsigned long flags; dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n", TX_TIMEOUT * 1000UL / HZ); dev->stats.tx_errors++; /* Reset the device */ spin_lock_irqsave(&lp->reset_lock, flags); /* Shouldn't really be necessary, but shouldn't hurt */ netif_stop_queue(dev); xemaclite_disable_interrupts(lp); xemaclite_enable_interrupts(lp); if (lp->deferred_skb) { dev_kfree_skb(lp->deferred_skb); lp->deferred_skb = NULL; dev->stats.tx_errors++; } /* To exclude tx timeout */ dev->trans_start = 0xffffffff - TX_TIMEOUT - TX_TIMEOUT; /* We're all ready to go. Start the queue */ netif_wake_queue(dev); spin_unlock_irqrestore(&lp->reset_lock, flags); } /**********************/ /* Interrupt Handlers */ /**********************/ /** * xemaclite_tx_handler - Interrupt handler for frames sent * @dev: Pointer to the network device * * This function updates the number of packets transmitted and handles the * deferred skb, if there is one. */ static void xemaclite_tx_handler(struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); dev->stats.tx_packets++; if (lp->deferred_skb) { if (xemaclite_send_data(lp, (u8 *) lp->deferred_skb->data, lp->deferred_skb->len) != 0) return; else { dev->stats.tx_bytes += lp->deferred_skb->len; dev_kfree_skb_irq(lp->deferred_skb); lp->deferred_skb = NULL; dev->trans_start = jiffies; netif_wake_queue(dev); } } } /** * xemaclite_rx_handler- Interrupt handler for frames received * @dev: Pointer to the network device * * This function allocates memory for a socket buffer, fills it with data * received and hands it over to the TCP/IP stack. */ static void xemaclite_rx_handler(struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); struct sk_buff *skb; unsigned int align; u32 len; len = ETH_FRAME_LEN + ETH_FCS_LEN; skb = dev_alloc_skb(len + ALIGNMENT); if (!skb) { /* Couldn't get memory. */ dev->stats.rx_dropped++; dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n"); return; } /* * A new skb should have the data halfword aligned, but this code is * here just in case that isn't true. Calculate how many * bytes we should reserve to get the data to start on a word * boundary */ align = BUFFER_ALIGN(skb->data); if (align) skb_reserve(skb, align); skb_reserve(skb, 2); len = xemaclite_recv_data(lp, (u8 *) skb->data); if (!len) { dev->stats.rx_errors++; dev_kfree_skb_irq(skb); return; } skb_put(skb, len); /* Tell the skb how much data we got */ skb->dev = dev; /* Fill out required meta-data */ skb->protocol = eth_type_trans(skb, dev); skb->ip_summed = CHECKSUM_NONE; dev->stats.rx_packets++; dev->stats.rx_bytes += len; netif_rx(skb); /* Send the packet upstream */ } /** * xemaclite_interrupt - Interrupt handler for this driver * @irq: Irq of the Emaclite device * @dev_id: Void pointer to the network device instance used as callback * reference * * This function handles the Tx and Rx interrupts of the EmacLite device. */ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) { bool tx_complete = 0; struct net_device *dev = dev_id; struct net_local *lp = (struct net_local *) netdev_priv(dev); void __iomem *base_addr = lp->base_addr; u32 tx_status; /* Check if there is Rx Data available */ if ((in_be32(base_addr + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK) || (in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK)) xemaclite_rx_handler(dev); /* Check if the Transmission for the first buffer is completed */ tx_status = in_be32(base_addr + XEL_TSR_OFFSET); if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; out_be32(base_addr + XEL_TSR_OFFSET, tx_status); tx_complete = 1; } /* Check if the Transmission for the second buffer is completed */ tx_status = in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; out_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, tx_status); tx_complete = 1; } /* If there was a Tx interrupt, call the Tx Handler */ if (tx_complete != 0) xemaclite_tx_handler(dev); return IRQ_HANDLED; } /** * xemaclite_open - Open the network device * @dev: Pointer to the network device * * This function sets the MAC address, requests an IRQ and enables interrupts * for the Emaclite device and starts the Tx queue. */ static int xemaclite_open(struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); int retval; /* Just to be safe, stop the device first */ xemaclite_disable_interrupts(lp); /* Set the MAC address each time opened */ xemaclite_set_mac_address(lp, dev->dev_addr); /* Grab the IRQ */ retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev); if (retval) { dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n", dev->irq); return retval; } /* Enable Interrupts */ xemaclite_enable_interrupts(lp); /* We're ready to go */ netif_start_queue(dev); return 0; } /** * xemaclite_close - Close the network device * @dev: Pointer to the network device * * This function stops the Tx queue, disables interrupts and frees the IRQ for * the Emaclite device. */ static int xemaclite_close(struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); netif_stop_queue(dev); xemaclite_disable_interrupts(lp); free_irq(dev->irq, dev); return 0; } /** * xemaclite_get_stats - Get the stats for the net_device * @dev: Pointer to the network device * * This function returns the address of the 'net_device_stats' structure for the * given network device. This structure holds usage statistics for the network * device. * * Return: Pointer to the net_device_stats structure. */ static struct net_device_stats *xemaclite_get_stats(struct net_device *dev) { return &dev->stats; } /** * xemaclite_send - Transmit a frame * @orig_skb: Pointer to the socket buffer to be transmitted * @dev: Pointer to the network device * * This function checks if the Tx buffer of the Emaclite device is free to send * data. If so, it fills the Tx buffer with data from socket buffer data, * updates the stats and frees the socket buffer. The Tx completion is signaled * by an interrupt. If the Tx buffer isn't free, then the socket buffer is * deferred and the Tx queue is stopped so that the deferred socket buffer can * be transmitted when the Emaclite device is free to transmit data. * * Return: 0, always. */ static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev) { struct net_local *lp = (struct net_local *) netdev_priv(dev); struct sk_buff *new_skb; unsigned int len; unsigned long flags; len = orig_skb->len; new_skb = orig_skb; spin_lock_irqsave(&lp->reset_lock, flags); if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) { /* If the Emaclite Tx buffer is busy, stop the Tx queue and * defer the skb for transmission at a later point when the * current transmission is complete */ netif_stop_queue(dev); lp->deferred_skb = new_skb; spin_unlock_irqrestore(&lp->reset_lock, flags); return 0; } spin_unlock_irqrestore(&lp->reset_lock, flags); dev->stats.tx_bytes += len; dev_kfree_skb(new_skb); dev->trans_start = jiffies; return 0; } /** * xemaclite_ioctl - Perform IO Control operations on the network device * @dev: Pointer to the network device * @rq: Pointer to the interface request structure * @cmd: IOCTL command * * The only IOCTL operation supported by this function is setting the MAC * address. An error is reported if any other operations are requested. * * Return: 0 to indicate success, or a negative error for failure. */ static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) { struct net_local *lp = (struct net_local *) netdev_priv(dev); struct hw_addr_data *hw_addr = (struct hw_addr_data *) &rq->ifr_hwaddr; switch (cmd) { case SIOCETHTOOL: return -EIO; case SIOCSIFHWADDR: dev_err(&lp->ndev->dev, "SIOCSIFHWADDR\n"); /* Copy MAC address in from user space */ copy_from_user((void __force *) dev->dev_addr, (void __user __force *) hw_addr, IFHWADDRLEN); xemaclite_set_mac_address(lp, dev->dev_addr); break; default: return -EOPNOTSUPP; } return 0; } /** * xemaclite_remove_ndev - Free the network device * @ndev: Pointer to the network device to be freed * * This function un maps the IO region of the Emaclite device and frees the net * device. */ static void xemaclite_remove_ndev(struct net_device *ndev) { if (ndev) { struct net_local *lp = (struct net_local *) netdev_priv(ndev); if (lp->base_addr) iounmap((void __iomem __force *) (lp->base_addr)); free_netdev(ndev); } } /** * get_bool - Get a parameter from the OF device * @ofdev: Pointer to OF device structure * @s: Property to be retrieved * * This function looks for a property in the device node and returns the value * of the property if its found or 0 if the property is not found. * * Return: Value of the parameter if the parameter is found, or 0 otherwise */ static bool get_bool(struct of_device *ofdev, const char *s) { u32 *p = (u32 *)of_get_property(ofdev->node, s, NULL); if (p) { return (bool)*p; } else { dev_warn(&ofdev->dev, "Parameter %s not found," "defaulting to false\n", s); return 0; } } static struct net_device_ops xemaclite_netdev_ops; /** * xemaclite_of_probe - Probe method for the Emaclite device. * @ofdev: Pointer to OF device structure * @match: Pointer to the structure used for matching a device * * This function probes for the Emaclite device in the device tree. * It initializes the driver data structure and the hardware, sets the MAC * address and registers the network device. * * Return: 0, if the driver is bound to the Emaclite device, or * a negative error if there is failure. */ static int __devinit xemaclite_of_probe(struct of_device *ofdev, const struct of_device_id *match) { struct resource r_irq; /* Interrupt resources */ struct resource r_mem; /* IO mem resources */ struct net_device *ndev = NULL; struct net_local *lp = NULL; struct device *dev = &ofdev->dev; const void *mac_address; int rc = 0; dev_info(dev, "Device Tree Probing\n"); /* Get iospace for the device */ rc = of_address_to_resource(ofdev->node, 0, &r_mem); if (rc) { dev_err(dev, "invalid address\n"); return rc; } /* Get IRQ for the device */ rc = of_irq_to_resource(ofdev->node, 0, &r_irq); if (rc == NO_IRQ) { dev_err(dev, "no IRQ found\n"); return rc; } /* Create an ethernet device instance */ ndev = alloc_etherdev(sizeof(struct net_local)); if (!ndev) { dev_err(dev, "Could not allocate network device\n"); return -ENOMEM; } dev_set_drvdata(dev, ndev); ndev->irq = r_irq.start; ndev->mem_start = r_mem.start; ndev->mem_end = r_mem.end; lp = netdev_priv(ndev); lp->ndev = ndev; if (!request_mem_region(ndev->mem_start, ndev->mem_end - ndev->mem_start + 1, DRIVER_NAME)) { dev_err(dev, "Couldn't lock memory region at %p\n", (void *)ndev->mem_start); rc = -EBUSY; goto error2; } /* Get the virtual base address for the device */ lp->base_addr = ioremap(r_mem.start, r_mem.end - r_mem.start + 1); if (NULL == lp->base_addr) { dev_err(dev, "EmacLite: Could not allocate iomem\n"); rc = -EIO; goto error1; } spin_lock_init(&lp->reset_lock); lp->next_tx_buf_to_use = 0x0; lp->next_rx_buf_to_use = 0x0; lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong"); lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong"); mac_address = of_get_mac_address(ofdev->node); if (mac_address) /* Set the MAC address. */ memcpy(ndev->dev_addr, mac_address, 6); else dev_warn(dev, "No MAC address found\n"); /* Clear the Tx CSR's in case this is a restart */ out_be32(lp->base_addr + XEL_TSR_OFFSET, 0); out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0); /* Set the MAC address in the EmacLite device */ xemaclite_set_mac_address(lp, ndev->dev_addr); dev_info(dev, "MAC address is now %2x:%2x:%2x:%2x:%2x:%2x\n", ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2], ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]); ndev->netdev_ops = &xemaclite_netdev_ops; ndev->flags &= ~IFF_MULTICAST; ndev->watchdog_timeo = TX_TIMEOUT; /* Finally, register the device */ rc = register_netdev(ndev); if (rc) { dev_err(dev, "Cannot register network device, aborting\n"); goto error1; } dev_info(dev, "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n", (unsigned int __force)ndev->mem_start, (unsigned int __force)lp->base_addr, ndev->irq); return 0; error1: release_mem_region(ndev->mem_start, r_mem.end - r_mem.start + 1); error2: xemaclite_remove_ndev(ndev); return rc; } /** * xemaclite_of_remove - Unbind the driver from the Emaclite device. * @of_dev: Pointer to OF device structure * * This function is called if a device is physically removed from the system or * if the driver module is being unloaded. It frees any resources allocated to * the device. * * Return: 0, always. */ static int __devexit xemaclite_of_remove(struct of_device *of_dev) { struct device *dev = &of_dev->dev; struct net_device *ndev = dev_get_drvdata(dev); unregister_netdev(ndev); release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1); xemaclite_remove_ndev(ndev); dev_set_drvdata(dev, NULL); return 0; } static struct net_device_ops xemaclite_netdev_ops = { .ndo_open = xemaclite_open, .ndo_stop = xemaclite_close, .ndo_start_xmit = xemaclite_send, .ndo_do_ioctl = xemaclite_ioctl, .ndo_tx_timeout = xemaclite_tx_timeout, .ndo_get_stats = xemaclite_get_stats, }; /* Match table for OF platform binding */ static struct of_device_id xemaclite_of_match[] __devinitdata = { { .compatible = "xlnx,opb-ethernetlite-1.01.a", }, { .compatible = "xlnx,opb-ethernetlite-1.01.b", }, { .compatible = "xlnx,xps-ethernetlite-1.00.a", }, { .compatible = "xlnx,xps-ethernetlite-2.00.a", }, { .compatible = "xlnx,xps-ethernetlite-2.01.a", }, { /* end of list */ }, }; MODULE_DEVICE_TABLE(of, xemaclite_of_match); static struct of_platform_driver xemaclite_of_driver = { .name = DRIVER_NAME, .match_table = xemaclite_of_match, .probe = xemaclite_of_probe, .remove = __devexit_p(xemaclite_of_remove), }; /** * xgpiopss_init - Initial driver registration call * * Return: 0 upon success, or a negative error upon failure. */ static int __init xemaclite_init(void) { /* No kernel boot options used, we just need to register the driver */ return of_register_platform_driver(&xemaclite_of_driver); } /** * xemaclite_cleanup - Driver un-registration call */ static void __exit xemaclite_cleanup(void) { of_unregister_platform_driver(&xemaclite_of_driver); } module_init(xemaclite_init); module_exit(xemaclite_cleanup); MODULE_AUTHOR("Xilinx, Inc."); MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver"); MODULE_LICENSE("GPL");