diff options
Diffstat (limited to 'drivers/net/xilinx_emaclite.c')
| -rw-r--r-- | drivers/net/xilinx_emaclite.c | 1037 |
1 files changed, 0 insertions, 1037 deletions
diff --git a/drivers/net/xilinx_emaclite.c b/drivers/net/xilinx_emaclite.c deleted file mode 100644 index 8c777ba4e2b..00000000000 --- a/drivers/net/xilinx_emaclite.c +++ /dev/null @@ -1,1037 +0,0 @@ -/* - * 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"); |