![Grant Likely](/assets/img/avatar_default.png)
Merging in current state of Linus' tree to deal with merge conflicts and build failures in vio.c after merge. Conflicts: drivers/i2c/busses/i2c-cpm.c drivers/i2c/busses/i2c-mpc.c drivers/net/gianfar.c Also fixed up one line in arch/powerpc/kernel/vio.c to use the correct node pointer. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
1328 lines
38 KiB
C
1328 lines
38 KiB
C
/*
|
|
* 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/slab.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 = jiffies; /* prevent 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; /* prevent tx timeout */
|
|
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->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);
|
|
|
|
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->dev.of_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->dev.of_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->dev.of_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, resource_size(&r_mem));
|
|
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->dev.of_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->dev.of_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, resource_size(&r_mem));
|
|
|
|
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 = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
.of_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");
|