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linux-sg2042/drivers/net/bfin_mac.c

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/*
* File: drivers/net/bfin_mac.c
* Based on:
* Maintainer:
* Bryan Wu <bryan.wu@analog.com>
*
* Original author:
* Luke Yang <luke.yang@analog.com>
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program ; see the file COPYING.
* If not, write to the Free Software Foundation,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <asm/dma.h>
#include <linux/dma-mapping.h>
#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/portmux.h>
#include "bfin_mac.h"
#define DRV_NAME "bfin_mac"
#define DRV_VERSION "1.1"
#define DRV_AUTHOR "Bryan Wu, Luke Yang"
#define DRV_DESC "Blackfin BF53[67] on-chip Ethernet MAC driver"
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRV_DESC);
#if defined(CONFIG_BFIN_MAC_USE_L1)
# define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
# define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
#else
# define bfin_mac_alloc(dma_handle, size) \
dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
# define bfin_mac_free(dma_handle, ptr) \
dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
#endif
#define PKT_BUF_SZ 1580
#define MAX_TIMEOUT_CNT 500
/* pointers to maintain transmit list */
static struct net_dma_desc_tx *tx_list_head;
static struct net_dma_desc_tx *tx_list_tail;
static struct net_dma_desc_rx *rx_list_head;
static struct net_dma_desc_rx *rx_list_tail;
static struct net_dma_desc_rx *current_rx_ptr;
static struct net_dma_desc_tx *current_tx_ptr;
static struct net_dma_desc_tx *tx_desc;
static struct net_dma_desc_rx *rx_desc;
static void desc_list_free(void)
{
struct net_dma_desc_rx *r;
struct net_dma_desc_tx *t;
int i;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
dma_addr_t dma_handle = 0;
#endif
if (tx_desc) {
t = tx_list_head;
for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
if (t) {
if (t->skb) {
dev_kfree_skb(t->skb);
t->skb = NULL;
}
t = t->next;
}
}
bfin_mac_free(dma_handle, tx_desc);
}
if (rx_desc) {
r = rx_list_head;
for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
if (r) {
if (r->skb) {
dev_kfree_skb(r->skb);
r->skb = NULL;
}
r = r->next;
}
}
bfin_mac_free(dma_handle, rx_desc);
}
}
static int desc_list_init(void)
{
int i;
struct sk_buff *new_skb;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
/*
* This dma_handle is useless in Blackfin dma_alloc_coherent().
* The real dma handler is the return value of dma_alloc_coherent().
*/
dma_addr_t dma_handle;
#endif
tx_desc = bfin_mac_alloc(&dma_handle,
sizeof(struct net_dma_desc_tx) *
CONFIG_BFIN_TX_DESC_NUM);
if (tx_desc == NULL)
goto init_error;
rx_desc = bfin_mac_alloc(&dma_handle,
sizeof(struct net_dma_desc_rx) *
CONFIG_BFIN_RX_DESC_NUM);
if (rx_desc == NULL)
goto init_error;
/* init tx_list */
tx_list_head = tx_list_tail = tx_desc;
for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
struct net_dma_desc_tx *t = tx_desc + i;
struct dma_descriptor *a = &(t->desc_a);
struct dma_descriptor *b = &(t->desc_b);
/*
* disable DMA
* read from memory WNR = 0
* wordsize is 32 bits
* 6 half words is desc size
* large desc flow
*/
a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
a->start_addr = (unsigned long)t->packet;
a->x_count = 0;
a->next_dma_desc = b;
/*
* enabled DMA
* write to memory WNR = 1
* wordsize is 32 bits
* disable interrupt
* 6 half words is desc size
* large desc flow
*/
b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
b->start_addr = (unsigned long)(&(t->status));
b->x_count = 0;
t->skb = NULL;
tx_list_tail->desc_b.next_dma_desc = a;
tx_list_tail->next = t;
tx_list_tail = t;
}
tx_list_tail->next = tx_list_head; /* tx_list is a circle */
tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
current_tx_ptr = tx_list_head;
/* init rx_list */
rx_list_head = rx_list_tail = rx_desc;
for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
struct net_dma_desc_rx *r = rx_desc + i;
struct dma_descriptor *a = &(r->desc_a);
struct dma_descriptor *b = &(r->desc_b);
/* allocate a new skb for next time receive */
new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
if (!new_skb) {
printk(KERN_NOTICE DRV_NAME
": init: low on mem - packet dropped\n");
goto init_error;
}
skb_reserve(new_skb, 2);
r->skb = new_skb;
/*
* enabled DMA
* write to memory WNR = 1
* wordsize is 32 bits
* disable interrupt
* 6 half words is desc size
* large desc flow
*/
a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
/* since RXDWA is enabled */
a->start_addr = (unsigned long)new_skb->data - 2;
a->x_count = 0;
a->next_dma_desc = b;
/*
* enabled DMA
* write to memory WNR = 1
* wordsize is 32 bits
* enable interrupt
* 6 half words is desc size
* large desc flow
*/
b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
NDSIZE_6 | DMAFLOW_LARGE;
b->start_addr = (unsigned long)(&(r->status));
b->x_count = 0;
rx_list_tail->desc_b.next_dma_desc = a;
rx_list_tail->next = r;
rx_list_tail = r;
}
rx_list_tail->next = rx_list_head; /* rx_list is a circle */
rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
current_rx_ptr = rx_list_head;
return 0;
init_error:
desc_list_free();
printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
return -ENOMEM;
}
/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
/* Set FER regs to MUX in Ethernet pins */
static int setup_pin_mux(int action)
{
#if defined(CONFIG_BFIN_MAC_RMII)
u16 pin_req[] = P_RMII0;
#else
u16 pin_req[] = P_MII0;
#endif
if (action) {
if (peripheral_request_list(pin_req, DRV_NAME)) {
printk(KERN_ERR DRV_NAME
": Requesting Peripherals failed\n");
return -EFAULT;
}
} else
peripheral_free_list(pin_req);
return 0;
}
/* Wait until the previous MDC/MDIO transaction has completed */
static void poll_mdc_done(void)
{
int timeout_cnt = MAX_TIMEOUT_CNT;
/* poll the STABUSY bit */
while ((bfin_read_EMAC_STAADD()) & STABUSY) {
mdelay(10);
if (timeout_cnt-- < 0) {
printk(KERN_ERR DRV_NAME
": wait MDC/MDIO transaction to complete timeout\n");
break;
}
}
}
/* Read an off-chip register in a PHY through the MDC/MDIO port */
static u16 read_phy_reg(u16 PHYAddr, u16 RegAddr)
{
poll_mdc_done();
/* read mode */
bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) |
SET_REGAD(RegAddr) |
STABUSY);
poll_mdc_done();
return (u16) bfin_read_EMAC_STADAT();
}
/* Write an off-chip register in a PHY through the MDC/MDIO port */
static void raw_write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
{
bfin_write_EMAC_STADAT(Data);
/* write mode */
bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) |
SET_REGAD(RegAddr) |
STAOP |
STABUSY);
poll_mdc_done();
}
static void write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
{
poll_mdc_done();
raw_write_phy_reg(PHYAddr, RegAddr, Data);
}
/* set up the phy */
static void bf537mac_setphy(struct net_device *dev)
{
u16 phydat;
struct bf537mac_local *lp = netdev_priv(dev);
/* Program PHY registers */
pr_debug("start setting up phy\n");
/* issue a reset */
raw_write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, 0x8000);
/* wait half a second */
msleep(500);
phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
/* advertise flow control supported */
phydat = read_phy_reg(lp->PhyAddr, PHYREG_ANAR);
phydat |= (1 << 10);
write_phy_reg(lp->PhyAddr, PHYREG_ANAR, phydat);
phydat = 0;
if (lp->Negotiate)
phydat |= 0x1000; /* enable auto negotiation */
else {
if (lp->FullDuplex)
phydat |= (1 << 8); /* full duplex */
else
phydat &= (~(1 << 8)); /* half duplex */
if (!lp->Port10)
phydat |= (1 << 13); /* 100 Mbps */
else
phydat &= (~(1 << 13)); /* 10 Mbps */
}
if (lp->Loopback)
phydat |= (1 << 14); /* enable TX->RX loopback */
write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
msleep(500);
phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
/* check for SMSC PHY */
if ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID1) == 0x7) &&
((read_phy_reg(lp->PhyAddr, PHYREG_PHYID2) & 0xfff0) == 0xC0A0)) {
/*
* we have SMSC PHY so reqest interrupt
* on link down condition
*/
/* enable interrupts */
write_phy_reg(lp->PhyAddr, 30, 0x0ff);
}
}
/**************************************************************************/
void setup_system_regs(struct net_device *dev)
{
int phyaddr;
unsigned short sysctl, phydat;
u32 opmode;
struct bf537mac_local *lp = netdev_priv(dev);
int count = 0;
phyaddr = lp->PhyAddr;
/* Enable PHY output */
if (!(bfin_read_VR_CTL() & PHYCLKOE))
bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
/* MDC = 2.5 MHz */
sysctl = SET_MDCDIV(24);
/* Odd word alignment for Receive Frame DMA word */
/* Configure checksum support and rcve frame word alignment */
#if defined(BFIN_MAC_CSUM_OFFLOAD)
sysctl |= RXDWA | RXCKS;
#else
sysctl |= RXDWA;
#endif
bfin_write_EMAC_SYSCTL(sysctl);
/* auto negotiation on */
/* full duplex */
/* 100 Mbps */
phydat = PHY_ANEG_EN | PHY_DUPLEX | PHY_SPD_SET;
write_phy_reg(phyaddr, PHYREG_MODECTL, phydat);
/* test if full duplex supported */
do {
msleep(100);
phydat = read_phy_reg(phyaddr, PHYREG_MODESTAT);
if (count > 30) {
printk(KERN_NOTICE DRV_NAME ": Link is down\n");
printk(KERN_NOTICE DRV_NAME
"please check your network connection\n");
break;
}
count++;
} while (!(phydat & 0x0004));
phydat = read_phy_reg(phyaddr, PHYREG_ANLPAR);
if ((phydat & 0x0100) || (phydat & 0x0040)) {
opmode = FDMODE;
} else {
opmode = 0;
printk(KERN_INFO DRV_NAME
": Network is set to half duplex\n");
}
#if defined(CONFIG_BFIN_MAC_RMII)
opmode |= RMII; /* For Now only 100MBit are supported */
#endif
bfin_write_EMAC_OPMODE(opmode);
bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
/* Initialize the TX DMA channel registers */
bfin_write_DMA2_X_COUNT(0);
bfin_write_DMA2_X_MODIFY(4);
bfin_write_DMA2_Y_COUNT(0);
bfin_write_DMA2_Y_MODIFY(0);
/* Initialize the RX DMA channel registers */
bfin_write_DMA1_X_COUNT(0);
bfin_write_DMA1_X_MODIFY(4);
bfin_write_DMA1_Y_COUNT(0);
bfin_write_DMA1_Y_MODIFY(0);
}
void setup_mac_addr(u8 * mac_addr)
{
u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
/* this depends on a little-endian machine */
bfin_write_EMAC_ADDRLO(addr_low);
bfin_write_EMAC_ADDRHI(addr_hi);
}
static void adjust_tx_list(void)
{
int timeout_cnt = MAX_TIMEOUT_CNT;
if (tx_list_head->status.status_word != 0
&& current_tx_ptr != tx_list_head) {
goto adjust_head; /* released something, just return; */
}
/*
* if nothing released, check wait condition
* current's next can not be the head,
* otherwise the dma will not stop as we want
*/
if (current_tx_ptr->next->next == tx_list_head) {
while (tx_list_head->status.status_word == 0) {
mdelay(10);
if (tx_list_head->status.status_word != 0
|| !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
goto adjust_head;
}
if (timeout_cnt-- < 0) {
printk(KERN_ERR DRV_NAME
": wait for adjust tx list head timeout\n");
break;
}
}
if (tx_list_head->status.status_word != 0) {
goto adjust_head;
}
}
return;
adjust_head:
do {
tx_list_head->desc_a.config &= ~DMAEN;
tx_list_head->status.status_word = 0;
if (tx_list_head->skb) {
dev_kfree_skb(tx_list_head->skb);
tx_list_head->skb = NULL;
} else {
printk(KERN_ERR DRV_NAME
": no sk_buff in a transmitted frame!\n");
}
tx_list_head = tx_list_head->next;
} while (tx_list_head->status.status_word != 0
&& current_tx_ptr != tx_list_head);
return;
}
static int bf537mac_hard_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct bf537mac_local *lp = netdev_priv(dev);
unsigned int data;
current_tx_ptr->skb = skb;
/*
* Is skb->data always 16-bit aligned?
* Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
*/
if ((((unsigned int)(skb->data)) & 0x02) == 2) {
/* move skb->data to current_tx_ptr payload */
data = (unsigned int)(skb->data) - 2;
*((unsigned short *)data) = (unsigned short)(skb->len);
current_tx_ptr->desc_a.start_addr = (unsigned long)data;
/* this is important! */
blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
} else {
*((unsigned short *)(current_tx_ptr->packet)) =
(unsigned short)(skb->len);
memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
(skb->len));
current_tx_ptr->desc_a.start_addr =
(unsigned long)current_tx_ptr->packet;
if (current_tx_ptr->status.status_word != 0)
current_tx_ptr->status.status_word = 0;
blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
packet,
(unsigned int)(current_tx_ptr->
packet + skb->len) +
2);
}
/* enable this packet's dma */
current_tx_ptr->desc_a.config |= DMAEN;
/* tx dma is running, just return */
if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
goto out;
/* tx dma is not running */
bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
/* dma enabled, read from memory, size is 6 */
bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
/* Turn on the EMAC tx */
bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
out:
adjust_tx_list();
current_tx_ptr = current_tx_ptr->next;
dev->trans_start = jiffies;
lp->stats.tx_packets++;
lp->stats.tx_bytes += (skb->len);
return 0;
}
static void bf537mac_rx(struct net_device *dev)
{
struct sk_buff *skb, *new_skb;
struct bf537mac_local *lp = netdev_priv(dev);
unsigned short len;
/* allocate a new skb for next time receive */
skb = current_rx_ptr->skb;
new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
if (!new_skb) {
printk(KERN_NOTICE DRV_NAME
": rx: low on mem - packet dropped\n");
lp->stats.rx_dropped++;
goto out;
}
/* reserve 2 bytes for RXDWA padding */
skb_reserve(new_skb, 2);
current_rx_ptr->skb = new_skb;
current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
skb_put(skb, len);
blackfin_dcache_invalidate_range((unsigned long)skb->head,
(unsigned long)skb->tail);
dev->last_rx = jiffies;
skb->dev = dev;
skb->protocol = eth_type_trans(skb, dev);
#if defined(BFIN_MAC_CSUM_OFFLOAD)
skb->csum = current_rx_ptr->status.ip_payload_csum;
skb->ip_summed = CHECKSUM_PARTIAL;
#endif
netif_rx(skb);
lp->stats.rx_packets++;
lp->stats.rx_bytes += len;
current_rx_ptr->status.status_word = 0x00000000;
current_rx_ptr = current_rx_ptr->next;
out:
return;
}
/* interrupt routine to handle rx and error signal */
static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
int number = 0;
get_one_packet:
if (current_rx_ptr->status.status_word == 0) {
/* no more new packet received */
if (number == 0) {
if (current_rx_ptr->next->status.status_word != 0) {
current_rx_ptr = current_rx_ptr->next;
goto real_rx;
}
}
bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
DMA_DONE | DMA_ERR);
return IRQ_HANDLED;
}
real_rx:
bf537mac_rx(dev);
number++;
goto get_one_packet;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void bf537mac_poll(struct net_device *dev)
{
disable_irq(IRQ_MAC_RX);
bf537mac_interrupt(IRQ_MAC_RX, dev);
enable_irq(IRQ_MAC_RX);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */
static void bf537mac_reset(void)
{
unsigned int opmode;
opmode = bfin_read_EMAC_OPMODE();
opmode &= (~RE);
opmode &= (~TE);
/* Turn off the EMAC */
bfin_write_EMAC_OPMODE(opmode);
}
/*
* Enable Interrupts, Receive, and Transmit
*/
static int bf537mac_enable(struct net_device *dev)
{
u32 opmode;
pr_debug("%s: %s\n", dev->name, __FUNCTION__);
/* Set RX DMA */
bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
/* Wait MII done */
poll_mdc_done();
/* We enable only RX here */
/* ASTP : Enable Automatic Pad Stripping
PR : Promiscuous Mode for test
PSF : Receive frames with total length less than 64 bytes.
FDMODE : Full Duplex Mode
LB : Internal Loopback for test
RE : Receiver Enable */
opmode = bfin_read_EMAC_OPMODE();
if (opmode & FDMODE)
opmode |= PSF;
else
opmode |= DRO | DC | PSF;
opmode |= RE;
#if defined(CONFIG_BFIN_MAC_RMII)
opmode |= RMII; /* For Now only 100MBit are supported */
#ifdef CONFIG_BF_REV_0_2
opmode |= TE;
#endif
#endif
/* Turn on the EMAC rx */
bfin_write_EMAC_OPMODE(opmode);
return 0;
}
/* Our watchdog timed out. Called by the networking layer */
static void bf537mac_timeout(struct net_device *dev)
{
pr_debug("%s: %s\n", dev->name, __FUNCTION__);
bf537mac_reset();
/* reset tx queue */
tx_list_tail = tx_list_head->next;
bf537mac_enable(dev);
/* We can accept TX packets again */
dev->trans_start = jiffies;
netif_wake_queue(dev);
}
/*
* Get the current statistics.
* This may be called with the card open or closed.
*/
static struct net_device_stats *bf537mac_query_statistics(struct net_device
*dev)
{
struct bf537mac_local *lp = netdev_priv(dev);
pr_debug("%s: %s\n", dev->name, __FUNCTION__);
return &lp->stats;
}
/*
* This routine will, depending on the values passed to it,
* either make it accept multicast packets, go into
* promiscuous mode (for TCPDUMP and cousins) or accept
* a select set of multicast packets
*/
static void bf537mac_set_multicast_list(struct net_device *dev)
{
u32 sysctl;
if (dev->flags & IFF_PROMISC) {
printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
sysctl = bfin_read_EMAC_OPMODE();
sysctl |= RAF;
bfin_write_EMAC_OPMODE(sysctl);
} else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
/* accept all multicast */
sysctl = bfin_read_EMAC_OPMODE();
sysctl |= PAM;
bfin_write_EMAC_OPMODE(sysctl);
} else {
/* clear promisc or multicast mode */
sysctl = bfin_read_EMAC_OPMODE();
sysctl &= ~(RAF | PAM);
bfin_write_EMAC_OPMODE(sysctl);
}
}
/*
* this puts the device in an inactive state
*/
static void bf537mac_shutdown(struct net_device *dev)
{
/* Turn off the EMAC */
bfin_write_EMAC_OPMODE(0x00000000);
/* Turn off the EMAC RX DMA */
bfin_write_DMA1_CONFIG(0x0000);
bfin_write_DMA2_CONFIG(0x0000);
}
/*
* Open and Initialize the interface
*
* Set up everything, reset the card, etc..
*/
static int bf537mac_open(struct net_device *dev)
{
pr_debug("%s: %s\n", dev->name, __FUNCTION__);
/*
* Check that the address is valid. If its not, refuse
* to bring the device up. The user must specify an
* address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
*/
if (!is_valid_ether_addr(dev->dev_addr)) {
printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
return -EINVAL;
}
/* initial rx and tx list */
desc_list_init();
bf537mac_setphy(dev);
setup_system_regs(dev);
bf537mac_reset();
bf537mac_enable(dev);
pr_debug("hardware init finished\n");
netif_start_queue(dev);
netif_carrier_on(dev);
return 0;
}
/*
*
* this makes the board clean up everything that it can
* and not talk to the outside world. Caused by
* an 'ifconfig ethX down'
*/
static int bf537mac_close(struct net_device *dev)
{
pr_debug("%s: %s\n", dev->name, __FUNCTION__);
netif_stop_queue(dev);
netif_carrier_off(dev);
/* clear everything */
bf537mac_shutdown(dev);
/* free the rx/tx buffers */
desc_list_free();
return 0;
}
static int __init bf537mac_probe(struct net_device *dev)
{
struct bf537mac_local *lp = netdev_priv(dev);
int retval;
/* Grab the MAC address in the MAC */
*(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
*(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
/* probe mac */
/*todo: how to proble? which is revision_register */
bfin_write_EMAC_ADDRLO(0x12345678);
if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
pr_debug("can't detect bf537 mac!\n");
retval = -ENODEV;
goto err_out;
}
/* set the GPIO pins to Ethernet mode */
retval = setup_pin_mux(1);
if (retval)
return retval;
/*Is it valid? (Did bootloader initialize it?) */
if (!is_valid_ether_addr(dev->dev_addr)) {
/* Grab the MAC from the board somehow - this is done in the
arch/blackfin/mach-bf537/boards/eth_mac.c */
get_bf537_ether_addr(dev->dev_addr);
}
/* If still not valid, get a random one */
if (!is_valid_ether_addr(dev->dev_addr)) {
random_ether_addr(dev->dev_addr);
}
setup_mac_addr(dev->dev_addr);
/* Fill in the fields of the device structure with ethernet values. */
ether_setup(dev);
dev->open = bf537mac_open;
dev->stop = bf537mac_close;
dev->hard_start_xmit = bf537mac_hard_start_xmit;
dev->tx_timeout = bf537mac_timeout;
dev->get_stats = bf537mac_query_statistics;
dev->set_multicast_list = bf537mac_set_multicast_list;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = bf537mac_poll;
#endif
/* fill in some of the fields */
lp->version = 1;
lp->PhyAddr = 0x01;
lp->CLKIN = 25;
lp->FullDuplex = 0;
lp->Negotiate = 1;
lp->FlowControl = 0;
spin_lock_init(&lp->lock);
/* now, enable interrupts */
/* register irq handler */
if (request_irq
(IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
"BFIN537_MAC_RX", dev)) {
printk(KERN_WARNING DRV_NAME
": Unable to attach BlackFin MAC RX interrupt\n");
return -EBUSY;
}
/* Enable PHY output early */
if (!(bfin_read_VR_CTL() & PHYCLKOE))
bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
retval = register_netdev(dev);
if (retval == 0) {
/* now, print out the card info, in a short format.. */
printk(KERN_INFO "%s: Version %s, %s\n",
DRV_NAME, DRV_VERSION, DRV_DESC);
}
err_out:
return retval;
}
static int bfin_mac_probe(struct platform_device *pdev)
{
struct net_device *ndev;
ndev = alloc_etherdev(sizeof(struct bf537mac_local));
if (!ndev) {
printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
return -ENOMEM;
}
SET_MODULE_OWNER(ndev);
SET_NETDEV_DEV(ndev, &pdev->dev);
platform_set_drvdata(pdev, ndev);
if (bf537mac_probe(ndev) != 0) {
platform_set_drvdata(pdev, NULL);
free_netdev(ndev);
printk(KERN_WARNING DRV_NAME ": not found\n");
return -ENODEV;
}
return 0;
}
static int bfin_mac_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
unregister_netdev(ndev);
free_irq(IRQ_MAC_RX, ndev);
free_netdev(ndev);
setup_pin_mux(0);
return 0;
}
static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t state)
{
return 0;
}
static int bfin_mac_resume(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver bfin_mac_driver = {
.probe = bfin_mac_probe,
.remove = bfin_mac_remove,
.resume = bfin_mac_resume,
.suspend = bfin_mac_suspend,
.driver = {
.name = DRV_NAME,
},
};
static int __init bfin_mac_init(void)
{
return platform_driver_register(&bfin_mac_driver);
}
module_init(bfin_mac_init);
static void __exit bfin_mac_cleanup(void)
{
platform_driver_unregister(&bfin_mac_driver);
}
module_exit(bfin_mac_cleanup);
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