2009-08-20 17:52:16 +08:00
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/*
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* Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
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*
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* This is a new flat driver which is based on the original emac_lite
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* driver from John Williams <john.williams@petalogix.com>.
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*
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* 2007-2009 (c) Xilinx, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#define DRIVER_NAME "xilinx_emaclite"
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/* Register offsets for the EmacLite Core */
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#define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
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#define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
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#define XEL_TSR_OFFSET 0x07FC /* Tx status */
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#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
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#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
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#define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
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#define XEL_RSR_OFFSET 0x17FC /* Rx status */
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#define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
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/* Global Interrupt Enable Register (GIER) Bit Masks */
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#define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
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/* Transmit Status Register (TSR) Bit Masks */
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#define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
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#define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
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#define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
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#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
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* only. This is not documented
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* in the HW spec */
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/* Define for programming the MAC address into the EmacLite */
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#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
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/* Receive Status Register (RSR) */
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#define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */
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#define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */
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/* Transmit Packet Length Register (TPLR) */
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#define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */
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/* Receive Packet Length Register (RPLR) */
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#define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */
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#define XEL_HEADER_OFFSET 12 /* Offset to length field */
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#define XEL_HEADER_SHIFT 16 /* Shift value for length */
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/* General Ethernet Definitions */
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#define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */
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#define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */
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#define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */
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#define ALIGNMENT 4
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/* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
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#define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT)
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/**
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* struct net_local - Our private per device data
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* @ndev: instance of the network device
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* @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
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* @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
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* @next_tx_buf_to_use: next Tx buffer to write to
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* @next_rx_buf_to_use: next Rx buffer to read from
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* @base_addr: base address of the Emaclite device
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* @reset_lock: lock used for synchronization
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* @deferred_skb: holds an skb (for transmission at a later time) when the
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* Tx buffer is not free
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*/
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struct net_local {
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struct net_device *ndev;
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bool tx_ping_pong;
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bool rx_ping_pong;
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u32 next_tx_buf_to_use;
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u32 next_rx_buf_to_use;
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void __iomem *base_addr;
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spinlock_t reset_lock;
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struct sk_buff *deferred_skb;
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};
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/*************************/
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/* EmacLite driver calls */
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/*************************/
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/**
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* xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
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* @drvdata: Pointer to the Emaclite device private data
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*
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* This function enables the Tx and Rx interrupts for the Emaclite device along
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* with the Global Interrupt Enable.
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*/
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static void xemaclite_enable_interrupts(struct net_local *drvdata)
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{
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u32 reg_data;
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/* Enable the Tx interrupts for the first Buffer */
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reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
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reg_data | XEL_TSR_XMIT_IE_MASK);
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/* Enable the Tx interrupts for the second Buffer if
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* configured in HW */
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if (drvdata->tx_ping_pong != 0) {
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reg_data = in_be32(drvdata->base_addr +
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XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_TSR_OFFSET,
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reg_data | XEL_TSR_XMIT_IE_MASK);
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}
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/* Enable the Rx interrupts for the first buffer */
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out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
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2009-09-22 13:24:14 +08:00
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XEL_RSR_RECV_IE_MASK);
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2009-08-20 17:52:16 +08:00
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/* Enable the Rx interrupts for the second Buffer if
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* configured in HW */
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if (drvdata->rx_ping_pong != 0) {
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out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_RSR_OFFSET,
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2009-09-22 13:24:14 +08:00
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XEL_RSR_RECV_IE_MASK);
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2009-08-20 17:52:16 +08:00
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}
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/* Enable the Global Interrupt Enable */
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out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
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}
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/**
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* xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
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* @drvdata: Pointer to the Emaclite device private data
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*
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* This function disables the Tx and Rx interrupts for the Emaclite device,
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* along with the Global Interrupt Enable.
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*/
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static void xemaclite_disable_interrupts(struct net_local *drvdata)
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{
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u32 reg_data;
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/* Disable the Global Interrupt Enable */
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out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
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/* Disable the Tx interrupts for the first buffer */
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reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
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reg_data & (~XEL_TSR_XMIT_IE_MASK));
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/* Disable the Tx interrupts for the second Buffer
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* if configured in HW */
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if (drvdata->tx_ping_pong != 0) {
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reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_TSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_TSR_OFFSET,
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reg_data & (~XEL_TSR_XMIT_IE_MASK));
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}
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/* Disable the Rx interrupts for the first buffer */
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reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
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reg_data & (~XEL_RSR_RECV_IE_MASK));
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/* Disable the Rx interrupts for the second buffer
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* if configured in HW */
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if (drvdata->rx_ping_pong != 0) {
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reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_RSR_OFFSET);
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out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
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XEL_RSR_OFFSET,
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reg_data & (~XEL_RSR_RECV_IE_MASK));
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}
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}
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/**
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* xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
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* @src_ptr: Void pointer to the 16-bit aligned source address
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* @dest_ptr: Pointer to the 32-bit aligned destination address
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* @length: Number bytes to write from source to destination
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*
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* This function writes data from a 16-bit aligned buffer to a 32-bit aligned
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* address in the EmacLite device.
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*/
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static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
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unsigned length)
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{
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u32 align_buffer;
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u32 *to_u32_ptr;
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u16 *from_u16_ptr, *to_u16_ptr;
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to_u32_ptr = dest_ptr;
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from_u16_ptr = (u16 *) src_ptr;
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align_buffer = 0;
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for (; length > 3; length -= 4) {
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to_u16_ptr = (u16 *) ((void *) &align_buffer);
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*to_u16_ptr++ = *from_u16_ptr++;
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*to_u16_ptr++ = *from_u16_ptr++;
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/* Output a word */
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*to_u32_ptr++ = align_buffer;
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}
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if (length) {
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u8 *from_u8_ptr, *to_u8_ptr;
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/* Set up to output the remaining data */
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align_buffer = 0;
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to_u8_ptr = (u8 *) &align_buffer;
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from_u8_ptr = (u8 *) from_u16_ptr;
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/* Output the remaining data */
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for (; length > 0; length--)
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*to_u8_ptr++ = *from_u8_ptr++;
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*to_u32_ptr = align_buffer;
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}
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}
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/**
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* xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
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* @src_ptr: Pointer to the 32-bit aligned source address
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* @dest_ptr: Pointer to the 16-bit aligned destination address
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* @length: Number bytes to read from source to destination
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*
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* This function reads data from a 32-bit aligned address in the EmacLite device
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* to a 16-bit aligned buffer.
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*/
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static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
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unsigned length)
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{
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u16 *to_u16_ptr, *from_u16_ptr;
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u32 *from_u32_ptr;
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u32 align_buffer;
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from_u32_ptr = src_ptr;
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to_u16_ptr = (u16 *) dest_ptr;
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for (; length > 3; length -= 4) {
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/* Copy each word into the temporary buffer */
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align_buffer = *from_u32_ptr++;
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from_u16_ptr = (u16 *)&align_buffer;
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/* Read data from source */
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*to_u16_ptr++ = *from_u16_ptr++;
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*to_u16_ptr++ = *from_u16_ptr++;
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}
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if (length) {
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u8 *to_u8_ptr, *from_u8_ptr;
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/* Set up to read the remaining data */
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to_u8_ptr = (u8 *) to_u16_ptr;
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align_buffer = *from_u32_ptr++;
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from_u8_ptr = (u8 *) &align_buffer;
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/* Read the remaining data */
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for (; length > 0; length--)
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*to_u8_ptr = *from_u8_ptr;
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}
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}
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/**
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* xemaclite_send_data - Send an Ethernet frame
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* @drvdata: Pointer to the Emaclite device private data
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* @data: Pointer to the data to be sent
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* @byte_count: Total frame size, including header
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*
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* This function checks if the Tx buffer of the Emaclite device is free to send
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* data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
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* returns an error.
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*
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* Return: 0 upon success or -1 if the buffer(s) are full.
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*
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* Note: The maximum Tx packet size can not be more than Ethernet header
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* (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
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*/
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static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
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unsigned int byte_count)
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{
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u32 reg_data;
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void __iomem *addr;
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/* Determine the expected Tx buffer address */
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addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
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/* If the length is too large, truncate it */
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if (byte_count > ETH_FRAME_LEN)
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byte_count = ETH_FRAME_LEN;
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/* Check if the expected buffer is available */
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reg_data = in_be32(addr + XEL_TSR_OFFSET);
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if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
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XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
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/* Switch to next buffer if configured */
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if (drvdata->tx_ping_pong != 0)
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drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
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} else if (drvdata->tx_ping_pong != 0) {
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/* If the expected buffer is full, try the other buffer,
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* if it is configured in HW */
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addr = (void __iomem __force *)((u32 __force)addr ^
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XEL_BUFFER_OFFSET);
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reg_data = in_be32(addr + XEL_TSR_OFFSET);
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if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
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XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
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return -1; /* Buffers were full, return failure */
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} else
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return -1; /* Buffer was full, return failure */
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/* Write the frame to the buffer */
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xemaclite_aligned_write(data, (u32 __force *) addr, byte_count);
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out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK));
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/* Update the Tx Status Register to indicate that there is a
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* frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
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* 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 */
|
2009-11-19 15:29:17 +08:00
|
|
|
retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev);
|
2009-08-20 17:52:16 +08:00
|
|
|
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");
|