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kernel-fxtec-pro1x/drivers/net/xilinx_emaclite.c
John Linn 5cdaaa1286 net: emaclite: adding MDIO and phy lib support 
These changes add MDIO and phy lib support to the driver as the
IP core now supports the MDIO bus.

The MDIO bus and phy are added as a child to the emaclite in the device
tree as illustrated below.

mdio {
	#address-cells = <1>;
	#size-cells = <0>;
	phy0: phy@7 {
		compatible = "marvell,88e1111";
		reg = <7>;
	} ;
}

Signed-off-by: Sadanand Mutyala <Sadanand.Mutyala@xilinx.com>
Signed-off-by: John Linn <john.linn@xilinx.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-15 21:51:00 -08:00

1325 lines
38 KiB
C
Raw Blame History

/*
* 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>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#define DRIVER_NAME "xilinx_emaclite"
/* Register offsets for the EmacLite Core */
#define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
#define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */
#define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */
#define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */
#define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */
#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 */
/* MDIO Address Register Bit Masks */
#define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
#define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
#define XEL_MDIOADDR_PHYADR_SHIFT 5
#define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
/* MDIO Write Data Register Bit Masks */
#define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
/* MDIO Read Data Register Bit Masks */
#define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
/* MDIO Control Register Bit Masks */
#define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
#define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
/* 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
* @phy_dev: pointer to the PHY device
* @phy_node: pointer to the PHY device node
* @mii_bus: pointer to the MII bus
* @mdio_irqs: IRQs table for MDIO bus
* @last_link: last link status
* @has_mdio: indicates whether MDIO is included in the HW
*/
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;
struct phy_device *phy_dev;
struct device_node *phy_node;
struct mii_bus *mii_bus;
int mdio_irqs[PHY_MAX_ADDR];
int last_link;
bool has_mdio;
};
/*************************/
/* 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_update_address - Update the MAC address in the 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_update_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_set_mac_address - Set the MAC address for this device
* @dev: Pointer to the network device instance
* @addr: Void pointer to the sockaddr structure
*
* This function copies the HW address from the sockaddr strucutre to the
* net_device structure and updates the address in HW.
*
* Return: Error if the net device is busy or 0 if the addr is set
* successfully
*/
static int xemaclite_set_mac_address(struct net_device *dev, void *address)
{
struct net_local *lp = (struct net_local *) netdev_priv(dev);
struct sockaddr *addr = address;
if (netif_running(dev))
return -EBUSY;
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
xemaclite_update_address(lp, dev->dev_addr);
return 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;
}
/**********************/
/* MDIO Bus functions */
/**********************/
/**
* xemaclite_mdio_wait - Wait for the MDIO to be ready to use
* @lp: Pointer to the Emaclite device private data
*
* This function waits till the device is ready to accept a new MDIO
* request.
*
* Return: 0 for success or ETIMEDOUT for a timeout
*/
static int xemaclite_mdio_wait(struct net_local *lp)
{
long end = jiffies + 2;
/* wait for the MDIO interface to not be busy or timeout
after some time.
*/
while (in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET) &
XEL_MDIOCTRL_MDIOSTS_MASK) {
if (end - jiffies <= 0) {
WARN_ON(1);
return -ETIMEDOUT;
}
msleep(1);
}
return 0;
}
/**
* xemaclite_mdio_read - Read from a given MII management register
* @bus: the mii_bus struct
* @phy_id: the phy address
* @reg: register number to read from
*
* This function waits till the device is ready to accept a new MDIO
* request and then writes the phy address to the MDIO Address register
* and reads data from MDIO Read Data register, when its available.
*
* Return: Value read from the MII management register
*/
static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
{
struct net_local *lp = bus->priv;
u32 ctrl_reg;
u32 rc;
if (xemaclite_mdio_wait(lp))
return -ETIMEDOUT;
/* Write the PHY address, register number and set the OP bit in the
* MDIO Address register. Set the Status bit in the MDIO Control
* register to start a MDIO read transaction.
*/
ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET);
out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET,
XEL_MDIOADDR_OP_MASK |
((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg));
out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK);
if (xemaclite_mdio_wait(lp))
return -ETIMEDOUT;
rc = in_be32(lp->base_addr + XEL_MDIORD_OFFSET);
dev_dbg(&lp->ndev->dev,
"xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n",
phy_id, reg, rc);
return rc;
}
/**
* xemaclite_mdio_write - Write to a given MII management register
* @bus: the mii_bus struct
* @phy_id: the phy address
* @reg: register number to write to
* @val: value to write to the register number specified by reg
*
* This fucntion waits till the device is ready to accept a new MDIO
* request and then writes the val to the MDIO Write Data register.
*/
static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
u16 val)
{
struct net_local *lp = bus->priv;
u32 ctrl_reg;
dev_dbg(&lp->ndev->dev,
"xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
phy_id, reg, val);
if (xemaclite_mdio_wait(lp))
return -ETIMEDOUT;
/* Write the PHY address, register number and clear the OP bit in the
* MDIO Address register and then write the value into the MDIO Write
* Data register. Finally, set the Status bit in the MDIO Control
* register to start a MDIO write transaction.
*/
ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET);
out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET,
~XEL_MDIOADDR_OP_MASK &
((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg));
out_be32(lp->base_addr + XEL_MDIOWR_OFFSET, val);
out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK);
return 0;
}
/**
* xemaclite_mdio_reset - Reset the mdio bus.
* @bus: Pointer to the MII bus
*
* This function is required(?) as per Documentation/networking/phy.txt.
* There is no reset in this device; this function always returns 0.
*/
static int xemaclite_mdio_reset(struct mii_bus *bus)
{
return 0;
}
/**
* xemaclite_mdio_setup - Register mii_bus for the Emaclite device
* @lp: Pointer to the Emaclite device private data
* @ofdev: Pointer to OF device structure
*
* This function enables MDIO bus in the Emaclite device and registers a
* mii_bus.
*
* Return: 0 upon success or a negative error upon failure
*/
static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
{
struct mii_bus *bus;
int rc;
struct resource res;
struct device_node *np = of_get_parent(lp->phy_node);
/* Don't register the MDIO bus if the phy_node or its parent node
* can't be found.
*/
if (!np)
return -ENODEV;
/* Enable the MDIO bus by asserting the enable bit in MDIO Control
* register.
*/
out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
XEL_MDIOCTRL_MDIOEN_MASK);
bus = mdiobus_alloc();
if (!bus)
return -ENOMEM;
of_address_to_resource(np, 0, &res);
snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
(unsigned long long)res.start);
bus->priv = lp;
bus->name = "Xilinx Emaclite MDIO";
bus->read = xemaclite_mdio_read;
bus->write = xemaclite_mdio_write;
bus->reset = xemaclite_mdio_reset;
bus->parent = dev;
bus->irq = lp->mdio_irqs; /* preallocated IRQ table */
lp->mii_bus = bus;
rc = of_mdiobus_register(bus, np);
if (rc)
goto err_register;
return 0;
err_register:
mdiobus_free(bus);
return rc;
}
/**
* xemaclite_adjust_link - Link state callback for the Emaclite device
* @ndev: pointer to net_device struct
*
* There's nothing in the Emaclite device to be configured when the link
* state changes. We just print the status.
*/
void xemaclite_adjust_link(struct net_device *ndev)
{
struct net_local *lp = netdev_priv(ndev);
struct phy_device *phy = lp->phy_dev;
int link_state;
/* hash together the state values to decide if something has changed */
link_state = phy->speed | (phy->duplex << 1) | phy->link;
if (lp->last_link != link_state) {
lp->last_link = link_state;
phy_print_status(phy);
}
}
/**
* 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.
* It also connects to the phy device, if MDIO is included in Emaclite device.
*/
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);
if (lp->phy_node) {
u32 bmcr;
lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
xemaclite_adjust_link, 0,
PHY_INTERFACE_MODE_MII);
if (!lp->phy_dev) {
dev_err(&lp->ndev->dev, "of_phy_connect() failed\n");
return -ENODEV;
}
/* EmacLite doesn't support giga-bit speeds */
lp->phy_dev->supported &= (PHY_BASIC_FEATURES);
lp->phy_dev->advertising = lp->phy_dev->supported;
/* Don't advertise 1000BASE-T Full/Half duplex speeds */
phy_write(lp->phy_dev, MII_CTRL1000, 0);
/* Advertise only 10 and 100mbps full/half duplex speeds */
phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL);
/* Restart auto negotiation */
bmcr = phy_read(lp->phy_dev, MII_BMCR);
bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
phy_write(lp->phy_dev, MII_BMCR, bmcr);
phy_start(lp->phy_dev);
}
/* Set the MAC address each time opened */
xemaclite_update_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);
if (lp->phy_dev)
phy_disconnect(lp->phy_dev);
lp->phy_dev = NULL;
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.
* It also disconnects the phy device associated with 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);
if (lp->phy_dev)
phy_disconnect(lp->phy_dev);
lp->phy_dev = NULL;
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_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.
* It also registers a mii_bus for the Emaclite device, if MDIO is included
* in the 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);
SET_NETDEV_DEV(ndev, &ofdev->dev);
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_update_address(lp, ndev->dev_addr);
lp->phy_node = of_parse_phandle(ofdev->node, "phy-handle", 0);
rc = xemaclite_mdio_setup(lp, &ofdev->dev);
if (rc)
dev_warn(&ofdev->dev, "error registering MDIO bus\n");
dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
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);
struct net_local *lp = (struct net_local *) netdev_priv(ndev);
/* Un-register the mii_bus, if configured */
if (lp->has_mdio) {
mdiobus_unregister(lp->mii_bus);
kfree(lp->mii_bus->irq);
mdiobus_free(lp->mii_bus);
lp->mii_bus = NULL;
}
unregister_netdev(ndev);
if (lp->phy_node)
of_node_put(lp->phy_node);
lp->phy_node = NULL;
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_set_mac_address = xemaclite_set_mac_address,
.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", },
{ .compatible = "xlnx,xps-ethernetlite-3.00.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");
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