File: [Development] / linux-2.6-xfs / drivers / net / mv643xx_eth.c (download)
Revision 1.2, Wed Jan 5 14:17:31 2005 UTC (12 years, 9 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.1: +1 -1
lines
Merge up to 2.6.10.
Merge of 2.6.x-xfs-melb:linux:21010a by kenmcd.
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/*
* drivers/net/mv64340_eth.c - Driver for MV64340X ethernet ports
* Copyright (C) 2002 Matthew Dharm <mdharm@momenco.com>
*
* Based on the 64360 driver from:
* Copyright (C) 2002 rabeeh@galileo.co.il
*
* Copyright (C) 2003 PMC-Sierra, Inc.,
* written by Manish Lachwani (lachwani@pmc-sierra.com)
*
* Copyright (C) 2003 Ralf Baechle <ralf@linux-mips.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
* of the License, 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/fcntl.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ip.h>
#include <linux/init.h>
#include <linux/in.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include <asm/smp.h>
#include <linux/skbuff.h>
#include <linux/tcp.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/ip.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/types.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include "mv643xx_eth.h"
/*
* The first part is the high level driver of the gigE ethernet ports.
*/
/* Definition for configuring driver */
#undef MV64340_RX_QUEUE_FILL_ON_TASK
/* Constants */
#define EXTRA_BYTES 32
#define WRAP ETH_HLEN + 2 + 4 + 16
#define BUFFER_MTU dev->mtu + WRAP
#define INT_CAUSE_UNMASK_ALL 0x0007ffff
#define INT_CAUSE_UNMASK_ALL_EXT 0x0011ffff
#ifdef MV64340_RX_FILL_ON_TASK
#define INT_CAUSE_MASK_ALL 0x00000000
#define INT_CAUSE_CHECK_BITS INT_CAUSE_UNMASK_ALL
#define INT_CAUSE_CHECK_BITS_EXT INT_CAUSE_UNMASK_ALL_EXT
#endif
/* Static function declarations */
static int mv64340_eth_real_open(struct net_device *);
static int mv64340_eth_real_stop(struct net_device *);
static int mv64340_eth_change_mtu(struct net_device *, int);
static struct net_device_stats *mv64340_eth_get_stats(struct net_device *);
static void eth_port_init_mac_tables(unsigned int eth_port_num);
#ifdef MV64340_NAPI
static int mv64340_poll(struct net_device *dev, int *budget);
#endif
unsigned char prom_mac_addr_base[6];
unsigned long mv64340_sram_base;
/*
* Changes MTU (maximum transfer unit) of the gigabit ethenret port
*
* Input : pointer to ethernet interface network device structure
* new mtu size
* Output : 0 upon success, -EINVAL upon failure
*/
static int mv64340_eth_change_mtu(struct net_device *dev, int new_mtu)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned long flags;
spin_lock_irqsave(&mp->lock, flags);
if ((new_mtu > 9500) || (new_mtu < 64)) {
spin_unlock_irqrestore(&mp->lock, flags);
return -EINVAL;
}
dev->mtu = new_mtu;
/*
* Stop then re-open the interface. This will allocate RX skb's with
* the new MTU.
* There is a possible danger that the open will not successed, due
* to memory is full, which might fail the open function.
*/
if (netif_running(dev)) {
if (mv64340_eth_real_stop(dev))
printk(KERN_ERR
"%s: Fatal error on stopping device\n",
dev->name);
if (mv64340_eth_real_open(dev))
printk(KERN_ERR
"%s: Fatal error on opening device\n",
dev->name);
}
spin_unlock_irqrestore(&mp->lock, flags);
return 0;
}
/*
* mv64340_eth_rx_task
*
* Fills / refills RX queue on a certain gigabit ethernet port
*
* Input : pointer to ethernet interface network device structure
* Output : N/A
*/
static void mv64340_eth_rx_task(void *data)
{
struct net_device *dev = (struct net_device *) data;
struct mv64340_private *mp = netdev_priv(dev);
struct pkt_info pkt_info;
struct sk_buff *skb;
if (test_and_set_bit(0, &mp->rx_task_busy))
panic("%s: Error in test_set_bit / clear_bit", dev->name);
while (mp->rx_ring_skbs < (mp->rx_ring_size - 5)) {
/* The +8 for buffer allignment and another 32 byte extra */
skb = dev_alloc_skb(BUFFER_MTU + 8 + EXTRA_BYTES);
if (!skb)
/* Better luck next time */
break;
mp->rx_ring_skbs++;
pkt_info.cmd_sts = ETH_RX_ENABLE_INTERRUPT;
pkt_info.byte_cnt = dev->mtu + ETH_HLEN + 4 + 2 + EXTRA_BYTES;
/* Allign buffer to 8 bytes */
if (pkt_info.byte_cnt & ~0x7) {
pkt_info.byte_cnt &= ~0x7;
pkt_info.byte_cnt += 8;
}
pkt_info.buf_ptr =
pci_map_single(0, skb->data,
dev->mtu + ETH_HLEN + 4 + 2 + EXTRA_BYTES,
PCI_DMA_FROMDEVICE);
pkt_info.return_info = skb;
if (eth_rx_return_buff(mp, &pkt_info) != ETH_OK) {
printk(KERN_ERR
"%s: Error allocating RX Ring\n", dev->name);
break;
}
skb_reserve(skb, 2);
}
clear_bit(0, &mp->rx_task_busy);
/*
* If RX ring is empty of SKB, set a timer to try allocating
* again in a later time .
*/
if ((mp->rx_ring_skbs == 0) && (mp->rx_timer_flag == 0)) {
printk(KERN_INFO "%s: Rx ring is empty\n", dev->name);
/* After 100mSec */
mp->timeout.expires = jiffies + (HZ / 10);
add_timer(&mp->timeout);
mp->rx_timer_flag = 1;
}
#if MV64340_RX_QUEUE_FILL_ON_TASK
else {
/* Return interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(mp->port_num),
INT_CAUSE_UNMASK_ALL);
}
#endif
}
/*
* mv64340_eth_rx_task_timer_wrapper
*
* Timer routine to wake up RX queue filling task. This function is
* used only in case the RX queue is empty, and all alloc_skb has
* failed (due to out of memory event).
*
* Input : pointer to ethernet interface network device structure
* Output : N/A
*/
static void mv64340_eth_rx_task_timer_wrapper(unsigned long data)
{
struct net_device *dev = (struct net_device *) data;
struct mv64340_private *mp = netdev_priv(dev);
mp->rx_timer_flag = 0;
mv64340_eth_rx_task((void *) data);
}
/*
* mv64340_eth_update_mac_address
*
* Update the MAC address of the port in the address table
*
* Input : pointer to ethernet interface network device structure
* Output : N/A
*/
static void mv64340_eth_update_mac_address(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
eth_port_init_mac_tables(port_num);
memcpy(mp->port_mac_addr, dev->dev_addr, 6);
eth_port_uc_addr_set(port_num, mp->port_mac_addr);
}
/*
* mv64340_eth_set_rx_mode
*
* Change from promiscuos to regular rx mode
*
* Input : pointer to ethernet interface network device structure
* Output : N/A
*/
static void mv64340_eth_set_rx_mode(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
if (dev->flags & IFF_PROMISC) {
ethernet_set_config_reg
(mp->port_num,
ethernet_get_config_reg(mp->port_num) |
ETH_UNICAST_PROMISCUOUS_MODE);
} else {
ethernet_set_config_reg
(mp->port_num,
ethernet_get_config_reg(mp->port_num) &
~(unsigned int) ETH_UNICAST_PROMISCUOUS_MODE);
}
}
/*
* mv64340_eth_set_mac_address
*
* Change the interface's mac address.
* No special hardware thing should be done because interface is always
* put in promiscuous mode.
*
* Input : pointer to ethernet interface network device structure and
* a pointer to the designated entry to be added to the cache.
* Output : zero upon success, negative upon failure
*/
static int mv64340_eth_set_mac_address(struct net_device *dev, void *addr)
{
int i;
for (i = 0; i < 6; i++)
/* +2 is for the offset of the HW addr type */
dev->dev_addr[i] = ((unsigned char *) addr)[i + 2];
mv64340_eth_update_mac_address(dev);
return 0;
}
/*
* mv64340_eth_tx_timeout
*
* Called upon a timeout on transmitting a packet
*
* Input : pointer to ethernet interface network device structure.
* Output : N/A
*/
static void mv64340_eth_tx_timeout(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
printk(KERN_INFO "%s: TX timeout ", dev->name);
/* Do the reset outside of interrupt context */
schedule_work(&mp->tx_timeout_task);
}
/*
* mv64340_eth_tx_timeout_task
*
* Actual routine to reset the adapter when a timeout on Tx has occurred
*/
static void mv64340_eth_tx_timeout_task(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
netif_device_detach(dev);
eth_port_reset(mp->port_num);
eth_port_start(mp);
netif_device_attach(dev);
}
/*
* mv64340_eth_free_tx_queue
*
* Input : dev - a pointer to the required interface
*
* Output : 0 if was able to release skb , nonzero otherwise
*/
static int mv64340_eth_free_tx_queue(struct net_device *dev,
unsigned int eth_int_cause_ext)
{
struct mv64340_private *mp = netdev_priv(dev);
struct net_device_stats *stats = &mp->stats;
struct pkt_info pkt_info;
int released = 1;
if (!(eth_int_cause_ext & (BIT0 | BIT8)))
return released;
spin_lock(&mp->lock);
/* Check only queue 0 */
while (eth_tx_return_desc(mp, &pkt_info) == ETH_OK) {
if (pkt_info.cmd_sts & BIT0) {
printk("%s: Error in TX\n", dev->name);
stats->tx_errors++;
}
/*
* If return_info is different than 0, release the skb.
* The case where return_info is not 0 is only in case
* when transmitted a scatter/gather packet, where only
* last skb releases the whole chain.
*/
if (pkt_info.return_info) {
dev_kfree_skb_irq((struct sk_buff *)
pkt_info.return_info);
released = 0;
if (skb_shinfo(pkt_info.return_info)->nr_frags)
pci_unmap_page(NULL, pkt_info.buf_ptr,
pkt_info.byte_cnt, PCI_DMA_TODEVICE);
if (mp->tx_ring_skbs != 1)
mp->tx_ring_skbs--;
} else
pci_unmap_page(NULL, pkt_info.buf_ptr,
pkt_info.byte_cnt, PCI_DMA_TODEVICE);
/*
* Decrement the number of outstanding skbs counter on
* the TX queue.
*/
if (mp->tx_ring_skbs == 0)
panic("ERROR - TX outstanding SKBs counter is corrupted");
}
spin_unlock(&mp->lock);
return released;
}
/*
* mv64340_eth_receive
*
* This function is forward packets that are received from the port's
* queues toward kernel core or FastRoute them to another interface.
*
* Input : dev - a pointer to the required interface
* max - maximum number to receive (0 means unlimted)
*
* Output : number of served packets
*/
#ifdef MV64340_NAPI
static int mv64340_eth_receive_queue(struct net_device *dev, unsigned int max,
int budget)
#else
static int mv64340_eth_receive_queue(struct net_device *dev, unsigned int max)
#endif
{
struct mv64340_private *mp = netdev_priv(dev);
struct net_device_stats *stats = &mp->stats;
unsigned int received_packets = 0;
struct sk_buff *skb;
struct pkt_info pkt_info;
#ifdef MV64340_NAPI
while (eth_port_receive(mp, &pkt_info) == ETH_OK && budget > 0) {
#else
while ((--max) && eth_port_receive(mp, &pkt_info) == ETH_OK) {
#endif
mp->rx_ring_skbs--;
received_packets++;
#ifdef MV64340_NAPI
budget--;
#endif
/* Update statistics. Note byte count includes 4 byte CRC count */
stats->rx_packets++;
stats->rx_bytes += pkt_info.byte_cnt;
skb = (struct sk_buff *) pkt_info.return_info;
/*
* In case received a packet without first / last bits on OR
* the error summary bit is on, the packets needs to be dropeed.
*/
if (((pkt_info.cmd_sts
& (ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC)) !=
(ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC))
|| (pkt_info.cmd_sts & ETH_ERROR_SUMMARY)) {
stats->rx_dropped++;
if ((pkt_info.cmd_sts & (ETH_RX_FIRST_DESC |
ETH_RX_LAST_DESC)) !=
(ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC)) {
if (net_ratelimit())
printk(KERN_ERR
"%s: Received packet spread on multiple"
" descriptors\n",
dev->name);
}
if (pkt_info.cmd_sts & ETH_ERROR_SUMMARY)
stats->rx_errors++;
dev_kfree_skb_irq(skb);
} else {
/*
* The -4 is for the CRC in the trailer of the
* received packet
*/
skb_put(skb, pkt_info.byte_cnt - 4);
skb->dev = dev;
if (pkt_info.cmd_sts & ETH_LAYER_4_CHECKSUM_OK) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->csum = htons((pkt_info.cmd_sts
& 0x0007fff8) >> 3);
}
skb->protocol = eth_type_trans(skb, dev);
#ifdef MV64340_NAPI
netif_receive_skb(skb);
#else
netif_rx(skb);
#endif
}
}
return received_packets;
}
/*
* mv64340_eth_int_handler
*
* Main interrupt handler for the gigbit ethernet ports
*
* Input : irq - irq number (not used)
* dev_id - a pointer to the required interface's data structure
* regs - not used
* Output : N/A
*/
static irqreturn_t mv64340_eth_int_handler(int irq, void *dev_id,
struct pt_regs *regs)
{
struct net_device *dev = (struct net_device *) dev_id;
struct mv64340_private *mp = netdev_priv(dev);
u32 eth_int_cause, eth_int_cause_ext = 0;
unsigned int port_num = mp->port_num;
/* Read interrupt cause registers */
eth_int_cause = MV_READ(MV64340_ETH_INTERRUPT_CAUSE_REG(port_num)) &
INT_CAUSE_UNMASK_ALL;
if (eth_int_cause & BIT1)
eth_int_cause_ext =
MV_READ(MV64340_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num)) &
INT_CAUSE_UNMASK_ALL_EXT;
#ifdef MV64340_NAPI
if (!(eth_int_cause & 0x0007fffd)) {
/* Dont ack the Rx interrupt */
#endif
/*
* Clear specific ethernet port intrerrupt registers by
* acknowleding relevant bits.
*/
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_REG(port_num),
~eth_int_cause);
if (eth_int_cause_ext != 0x0)
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num),
~eth_int_cause_ext);
/* UDP change : We may need this */
if ((eth_int_cause_ext & 0x0000ffff) &&
(mv64340_eth_free_tx_queue(dev, eth_int_cause_ext) == 0) &&
(MV64340_TX_QUEUE_SIZE > mp->tx_ring_skbs + 1))
netif_wake_queue(dev);
#ifdef MV64340_NAPI
} else {
if (netif_rx_schedule_prep(dev)) {
/* Mask all the interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(port_num),0);
MV_WRITE(MV64340_ETH_INTERRUPT_EXTEND_MASK_REG(port_num), 0);
__netif_rx_schedule(dev);
}
#else
{
if (eth_int_cause & (BIT2 | BIT11))
mv64340_eth_receive_queue(dev, 0);
/*
* After forwarded received packets to upper layer, add a task
* in an interrupts enabled context that refills the RX ring
* with skb's.
*/
#if MV64340_RX_QUEUE_FILL_ON_TASK
/* Unmask all interrupts on ethernet port */
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(port_num),
INT_CAUSE_MASK_ALL);
queue_task(&mp->rx_task, &tq_immediate);
mark_bh(IMMEDIATE_BH);
#else
mp->rx_task.func(dev);
#endif
#endif
}
/* PHY status changed */
if (eth_int_cause_ext & (BIT16 | BIT20)) {
unsigned int phy_reg_data;
/* Check Link status on ethernet port */
eth_port_read_smi_reg(port_num, 1, &phy_reg_data);
if (!(phy_reg_data & 0x20)) {
netif_stop_queue(dev);
} else {
netif_wake_queue(dev);
/*
* Start all TX queues on ethernet port. This is good in
* case of previous packets where not transmitted, due
* to link down and this command re-enables all TX
* queues.
* Note that it is possible to get a TX resource error
* interrupt after issuing this, since not all TX queues
* are enabled, or has anything to send.
*/
MV_WRITE(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num), 1);
}
}
/*
* If no real interrupt occured, exit.
* This can happen when using gigE interrupt coalescing mechanism.
*/
if ((eth_int_cause == 0x0) && (eth_int_cause_ext == 0x0))
return IRQ_NONE;
return IRQ_HANDLED;
}
#ifdef MV64340_COAL
/*
* eth_port_set_rx_coal - Sets coalescing interrupt mechanism on RX path
*
* DESCRIPTION:
* This routine sets the RX coalescing interrupt mechanism parameter.
* This parameter is a timeout counter, that counts in 64 t_clk
* chunks ; that when timeout event occurs a maskable interrupt
* occurs.
* The parameter is calculated using the tClk of the MV-643xx chip
* , and the required delay of the interrupt in usec.
*
* INPUT:
* unsigned int eth_port_num Ethernet port number
* unsigned int t_clk t_clk of the MV-643xx chip in HZ units
* unsigned int delay Delay in usec
*
* OUTPUT:
* Interrupt coalescing mechanism value is set in MV-643xx chip.
*
* RETURN:
* The interrupt coalescing value set in the gigE port.
*
*/
static unsigned int eth_port_set_rx_coal(unsigned int eth_port_num,
unsigned int t_clk, unsigned int delay)
{
unsigned int coal = ((t_clk / 1000000) * delay) / 64;
/* Set RX Coalescing mechanism */
MV_WRITE(MV64340_ETH_SDMA_CONFIG_REG(eth_port_num),
((coal & 0x3fff) << 8) |
(MV_READ(MV64340_ETH_SDMA_CONFIG_REG(eth_port_num))
& 0xffc000ff));
return coal;
}
#endif
/*
* eth_port_set_tx_coal - Sets coalescing interrupt mechanism on TX path
*
* DESCRIPTION:
* This routine sets the TX coalescing interrupt mechanism parameter.
* This parameter is a timeout counter, that counts in 64 t_clk
* chunks ; that when timeout event occurs a maskable interrupt
* occurs.
* The parameter is calculated using the t_cLK frequency of the
* MV-643xx chip and the required delay in the interrupt in uSec
*
* INPUT:
* unsigned int eth_port_num Ethernet port number
* unsigned int t_clk t_clk of the MV-643xx chip in HZ units
* unsigned int delay Delay in uSeconds
*
* OUTPUT:
* Interrupt coalescing mechanism value is set in MV-643xx chip.
*
* RETURN:
* The interrupt coalescing value set in the gigE port.
*
*/
static unsigned int eth_port_set_tx_coal(unsigned int eth_port_num,
unsigned int t_clk, unsigned int delay)
{
unsigned int coal;
coal = ((t_clk / 1000000) * delay) / 64;
/* Set TX Coalescing mechanism */
MV_WRITE(MV64340_ETH_TX_FIFO_URGENT_THRESHOLD_REG(eth_port_num),
coal << 4);
return coal;
}
/*
* mv64340_eth_open
*
* This function is called when openning the network device. The function
* should initialize all the hardware, initialize cyclic Rx/Tx
* descriptors chain and buffers and allocate an IRQ to the network
* device.
*
* Input : a pointer to the network device structure
*
* Output : zero of success , nonzero if fails.
*/
static int mv64340_eth_open(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
int err = err;
spin_lock_irq(&mp->lock);
err = request_irq(dev->irq, mv64340_eth_int_handler,
SA_INTERRUPT | SA_SAMPLE_RANDOM, dev->name, dev);
if (err) {
printk(KERN_ERR "Can not assign IRQ number to MV64340_eth%d\n",
port_num);
err = -EAGAIN;
goto out;
}
if (mv64340_eth_real_open(dev)) {
printk("%s: Error opening interface\n", dev->name);
err = -EBUSY;
goto out_free;
}
spin_unlock_irq(&mp->lock);
return 0;
out_free:
free_irq(dev->irq, dev);
out:
spin_unlock_irq(&mp->lock);
return err;
}
/*
* ether_init_rx_desc_ring - Curve a Rx chain desc list and buffer in memory.
*
* DESCRIPTION:
* This function prepares a Rx chained list of descriptors and packet
* buffers in a form of a ring. The routine must be called after port
* initialization routine and before port start routine.
* The Ethernet SDMA engine uses CPU bus addresses to access the various
* devices in the system (i.e. DRAM). This function uses the ethernet
* struct 'virtual to physical' routine (set by the user) to set the ring
* with physical addresses.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* int rx_desc_num Number of Rx descriptors
* int rx_buff_size Size of Rx buffer
* unsigned int rx_desc_base_addr Rx descriptors memory area base addr.
* unsigned int rx_buff_base_addr Rx buffer memory area base addr.
*
* OUTPUT:
* The routine updates the Ethernet port control struct with information
* regarding the Rx descriptors and buffers.
*
* RETURN:
* false if the given descriptors memory area is not aligned according to
* Ethernet SDMA specifications.
* true otherwise.
*/
static int ether_init_rx_desc_ring(struct mv64340_private * mp,
unsigned long rx_buff_base_addr)
{
unsigned long buffer_addr = rx_buff_base_addr;
volatile struct eth_rx_desc *p_rx_desc;
int rx_desc_num = mp->rx_ring_size;
unsigned long rx_desc_base_addr = (unsigned long) mp->p_rx_desc_area;
int rx_buff_size = 1536; /* Dummy, will be replaced later */
int i;
p_rx_desc = (struct eth_rx_desc *) rx_desc_base_addr;
/* Rx desc Must be 4LW aligned (i.e. Descriptor_Address[3:0]=0000). */
if (rx_buff_base_addr & 0xf)
return 0;
/* Rx buffers are limited to 64K bytes and Minimum size is 8 bytes */
if ((rx_buff_size < 8) || (rx_buff_size > RX_BUFFER_MAX_SIZE))
return 0;
/* Rx buffers must be 64-bit aligned. */
if ((rx_buff_base_addr + rx_buff_size) & 0x7)
return 0;
/* initialize the Rx descriptors ring */
for (i = 0; i < rx_desc_num; i++) {
p_rx_desc[i].buf_size = rx_buff_size;
p_rx_desc[i].byte_cnt = 0x0000;
p_rx_desc[i].cmd_sts =
ETH_BUFFER_OWNED_BY_DMA | ETH_RX_ENABLE_INTERRUPT;
p_rx_desc[i].next_desc_ptr = mp->rx_desc_dma +
((i + 1) % rx_desc_num) * sizeof(struct eth_rx_desc);
p_rx_desc[i].buf_ptr = buffer_addr;
mp->rx_skb[i] = NULL;
buffer_addr += rx_buff_size;
}
/* Save Rx desc pointer to driver struct. */
mp->rx_curr_desc_q = 0;
mp->rx_used_desc_q = 0;
mp->rx_desc_area_size = rx_desc_num * sizeof(struct eth_rx_desc);
mp->port_rx_queue_command |= 1;
return 1;
}
/*
* ether_init_tx_desc_ring - Curve a Tx chain desc list and buffer in memory.
*
* DESCRIPTION:
* This function prepares a Tx chained list of descriptors and packet
* buffers in a form of a ring. The routine must be called after port
* initialization routine and before port start routine.
* The Ethernet SDMA engine uses CPU bus addresses to access the various
* devices in the system (i.e. DRAM). This function uses the ethernet
* struct 'virtual to physical' routine (set by the user) to set the ring
* with physical addresses.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* int tx_desc_num Number of Tx descriptors
* int tx_buff_size Size of Tx buffer
* unsigned int tx_desc_base_addr Tx descriptors memory area base addr.
*
* OUTPUT:
* The routine updates the Ethernet port control struct with information
* regarding the Tx descriptors and buffers.
*
* RETURN:
* false if the given descriptors memory area is not aligned according to
* Ethernet SDMA specifications.
* true otherwise.
*/
static int ether_init_tx_desc_ring(struct mv64340_private *mp)
{
unsigned long tx_desc_base_addr = (unsigned long) mp->p_tx_desc_area;
int tx_desc_num = mp->tx_ring_size;
struct eth_tx_desc *p_tx_desc;
int i;
/* Tx desc Must be 4LW aligned (i.e. Descriptor_Address[3:0]=0000). */
if (tx_desc_base_addr & 0xf)
return 0;
/* save the first desc pointer to link with the last descriptor */
p_tx_desc = (struct eth_tx_desc *) tx_desc_base_addr;
/* Initialize the Tx descriptors ring */
for (i = 0; i < tx_desc_num; i++) {
p_tx_desc[i].byte_cnt = 0x0000;
p_tx_desc[i].l4i_chk = 0x0000;
p_tx_desc[i].cmd_sts = 0x00000000;
p_tx_desc[i].next_desc_ptr = mp->tx_desc_dma +
((i + 1) % tx_desc_num) * sizeof(struct eth_tx_desc);
p_tx_desc[i].buf_ptr = 0x00000000;
mp->tx_skb[i] = NULL;
}
/* Set Tx desc pointer in driver struct. */
mp->tx_curr_desc_q = 0;
mp->tx_used_desc_q = 0;
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
mp->tx_first_desc_q = 0;
#endif
/* Init Tx ring base and size parameters */
mp->tx_desc_area_size = tx_desc_num * sizeof(struct eth_tx_desc);
/* Add the queue to the list of Tx queues of this port */
mp->port_tx_queue_command |= 1;
return 1;
}
/* Helper function for mv64340_eth_open */
static int mv64340_eth_real_open(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
u32 phy_reg_data;
unsigned int size;
/* Stop RX Queues */
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num),
0x0000ff00);
/* Clear the ethernet port interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
/* Unmask RX buffer and TX end interrupt */
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(port_num),
INT_CAUSE_UNMASK_ALL);
/* Unmask phy and link status changes interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_EXTEND_MASK_REG(port_num),
INT_CAUSE_UNMASK_ALL_EXT);
/* Set the MAC Address */
memcpy(mp->port_mac_addr, dev->dev_addr, 6);
eth_port_init(mp);
INIT_WORK(&mp->rx_task, (void (*)(void *)) mv64340_eth_rx_task, dev);
memset(&mp->timeout, 0, sizeof(struct timer_list));
mp->timeout.function = mv64340_eth_rx_task_timer_wrapper;
mp->timeout.data = (unsigned long) dev;
mp->rx_task_busy = 0;
mp->rx_timer_flag = 0;
/* Allocate TX ring */
mp->tx_ring_skbs = 0;
mp->tx_ring_size = MV64340_TX_QUEUE_SIZE;
size = mp->tx_ring_size * sizeof(struct eth_tx_desc);
mp->tx_desc_area_size = size;
/* Assumes allocated ring is 16 bytes alligned */
mp->p_tx_desc_area = pci_alloc_consistent(NULL, size, &mp->tx_desc_dma);
if (!mp->p_tx_desc_area) {
printk(KERN_ERR "%s: Cannot allocate Tx Ring (size %d bytes)\n",
dev->name, size);
return -ENOMEM;
}
memset((void *) mp->p_tx_desc_area, 0, mp->tx_desc_area_size);
/* Dummy will be replaced upon real tx */
ether_init_tx_desc_ring(mp);
/* Allocate RX ring */
/* Meantime RX Ring are fixed - but must be configurable by user */
mp->rx_ring_size = MV64340_RX_QUEUE_SIZE;
mp->rx_ring_skbs = 0;
size = mp->rx_ring_size * sizeof(struct eth_rx_desc);
mp->rx_desc_area_size = size;
/* Assumes allocated ring is 16 bytes aligned */
mp->p_rx_desc_area = pci_alloc_consistent(NULL, size, &mp->rx_desc_dma);
if (!mp->p_rx_desc_area) {
printk(KERN_ERR "%s: Cannot allocate Rx ring (size %d bytes)\n",
dev->name, size);
printk(KERN_ERR "%s: Freeing previously allocated TX queues...",
dev->name);
pci_free_consistent(0, mp->tx_desc_area_size,
(void *) mp->p_tx_desc_area,
mp->tx_desc_dma);
return -ENOMEM;
}
memset(mp->p_rx_desc_area, 0, size);
if (!(ether_init_rx_desc_ring(mp, 0)))
panic("%s: Error initializing RX Ring", dev->name);
mv64340_eth_rx_task(dev); /* Fill RX ring with skb's */
eth_port_start(mp);
/* Interrupt Coalescing */
#ifdef MV64340_COAL
mp->rx_int_coal =
eth_port_set_rx_coal(port_num, 133000000, MV64340_RX_COAL);
#endif
mp->tx_int_coal =
eth_port_set_tx_coal (port_num, 133000000, MV64340_TX_COAL);
/* Increase the Rx side buffer size */
MV_WRITE (MV64340_ETH_PORT_SERIAL_CONTROL_REG(port_num), (0x5 << 17) |
(MV_READ(MV64340_ETH_PORT_SERIAL_CONTROL_REG(port_num))
& 0xfff1ffff));
/* Check Link status on phy */
eth_port_read_smi_reg(port_num, 1, &phy_reg_data);
if (!(phy_reg_data & 0x20))
netif_stop_queue(dev);
else
netif_start_queue(dev);
return 0;
}
static void mv64340_eth_free_tx_rings(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
unsigned int curr;
/* Stop Tx Queues */
MV_WRITE(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num),
0x0000ff00);
/* Free TX rings */
/* Free outstanding skb's on TX rings */
for (curr = 0;
(mp->tx_ring_skbs) && (curr < MV64340_TX_QUEUE_SIZE);
curr++) {
if (mp->tx_skb[curr]) {
dev_kfree_skb(mp->tx_skb[curr]);
mp->tx_ring_skbs--;
}
}
if (mp->tx_ring_skbs != 0)
printk("%s: Error on Tx descriptor free - could not free %d"
" descriptors\n", dev->name,
mp->tx_ring_skbs);
pci_free_consistent(0, mp->tx_desc_area_size,
(void *) mp->p_tx_desc_area, mp->tx_desc_dma);
}
static void mv64340_eth_free_rx_rings(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
int curr;
/* Stop RX Queues */
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num),
0x0000ff00);
/* Free RX rings */
/* Free preallocated skb's on RX rings */
for (curr = 0;
mp->rx_ring_skbs && (curr < MV64340_RX_QUEUE_SIZE);
curr++) {
if (mp->rx_skb[curr]) {
dev_kfree_skb(mp->rx_skb[curr]);
mp->rx_ring_skbs--;
}
}
if (mp->rx_ring_skbs != 0)
printk(KERN_ERR
"%s: Error in freeing Rx Ring. %d skb's still"
" stuck in RX Ring - ignoring them\n", dev->name,
mp->rx_ring_skbs);
pci_free_consistent(0, mp->rx_desc_area_size,
(void *) mp->p_rx_desc_area,
mp->rx_desc_dma);
}
/*
* mv64340_eth_stop
*
* This function is used when closing the network device.
* It updates the hardware,
* release all memory that holds buffers and descriptors and release the IRQ.
* Input : a pointer to the device structure
* Output : zero if success , nonzero if fails
*/
/* Helper function for mv64340_eth_stop */
static int mv64340_eth_real_stop(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unsigned int port_num = mp->port_num;
netif_stop_queue(dev);
mv64340_eth_free_tx_rings(dev);
mv64340_eth_free_rx_rings(dev);
eth_port_reset(mp->port_num);
/* Disable ethernet port interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
/* Mask RX buffer and TX end interrupt */
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(port_num), 0);
/* Mask phy and link status changes interrupts */
MV_WRITE(MV64340_ETH_INTERRUPT_EXTEND_MASK_REG(port_num), 0);
return 0;
}
static int mv64340_eth_stop(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
spin_lock_irq(&mp->lock);
mv64340_eth_real_stop(dev);
free_irq(dev->irq, dev);
spin_unlock_irq(&mp->lock);
return 0;
}
#ifdef MV64340_NAPI
static void mv64340_tx(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
struct pkt_info pkt_info;
while (eth_tx_return_desc(mp, &pkt_info) == ETH_OK) {
if (pkt_info.return_info) {
dev_kfree_skb_irq((struct sk_buff *)
pkt_info.return_info);
if (skb_shinfo(pkt_info.return_info)->nr_frags)
pci_unmap_page(NULL, pkt_info.buf_ptr,
pkt_info.byte_cnt,
PCI_DMA_TODEVICE);
if (mp->tx_ring_skbs != 1)
mp->tx_ring_skbs--;
} else
pci_unmap_page(NULL, pkt_info.buf_ptr, pkt_info.byte_cnt,
PCI_DMA_TODEVICE);
}
if (netif_queue_stopped(dev) &&
MV64340_TX_QUEUE_SIZE > mp->tx_ring_skbs + 1)
netif_wake_queue(dev);
}
/*
* mv64340_poll
*
* This function is used in case of NAPI
*/
static int mv64340_poll(struct net_device *dev, int *budget)
{
struct mv64340_private *mp = netdev_priv(dev);
int done = 1, orig_budget, work_done;
unsigned int port_num = mp->port_num;
unsigned long flags;
#ifdef MV64340_TX_FAST_REFILL
if (++mp->tx_clean_threshold > 5) {
spin_lock_irqsave(&mp->lock, flags);
mv64340_tx(dev);
mp->tx_clean_threshold = 0;
spin_unlock_irqrestore(&mp->lock, flags);
}
#endif
if ((u32)(MV_READ(MV64340_ETH_RX_CURRENT_QUEUE_DESC_PTR_0(port_num))) != (u32)mp->rx_used_desc_q) {
orig_budget = *budget;
if (orig_budget > dev->quota)
orig_budget = dev->quota;
work_done = mv64340_eth_receive_queue(dev, 0, orig_budget);
mp->rx_task.func(dev);
*budget -= work_done;
dev->quota -= work_done;
if (work_done >= orig_budget)
done = 0;
}
if (done) {
spin_lock_irqsave(&mp->lock, flags);
__netif_rx_complete(dev);
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_REG(port_num),0);
MV_WRITE(MV64340_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num),0);
MV_WRITE(MV64340_ETH_INTERRUPT_MASK_REG(port_num),
INT_CAUSE_UNMASK_ALL);
MV_WRITE(MV64340_ETH_INTERRUPT_EXTEND_MASK_REG(port_num),
INT_CAUSE_UNMASK_ALL_EXT);
spin_unlock_irqrestore(&mp->lock, flags);
}
return done ? 0 : 1;
}
#endif
/*
* mv64340_eth_start_xmit
*
* This function is queues a packet in the Tx descriptor for
* required port.
*
* Input : skb - a pointer to socket buffer
* dev - a pointer to the required port
*
* Output : zero upon success
*/
static int mv64340_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
struct net_device_stats *stats = &mp->stats;
ETH_FUNC_RET_STATUS status;
unsigned long flags;
struct pkt_info pkt_info;
if (netif_queue_stopped(dev)) {
printk(KERN_ERR
"%s: Tried sending packet when interface is stopped\n",
dev->name);
return 1;
}
/* This is a hard error, log it. */
if ((MV64340_TX_QUEUE_SIZE - mp->tx_ring_skbs) <=
(skb_shinfo(skb)->nr_frags + 1)) {
netif_stop_queue(dev);
printk(KERN_ERR
"%s: Bug in mv64340_eth - Trying to transmit when"
" queue full !\n", dev->name);
return 1;
}
/* Paranoid check - this shouldn't happen */
if (skb == NULL) {
stats->tx_dropped++;
return 1;
}
spin_lock_irqsave(&mp->lock, flags);
/* Update packet info data structure -- DMA owned, first last */
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
if (!skb_shinfo(skb)->nr_frags || (skb_shinfo(skb)->nr_frags > 3)) {
#endif
pkt_info.cmd_sts = ETH_TX_ENABLE_INTERRUPT |
ETH_TX_FIRST_DESC | ETH_TX_LAST_DESC;
pkt_info.byte_cnt = skb->len;
pkt_info.buf_ptr = pci_map_single(0, skb->data, skb->len,
PCI_DMA_TODEVICE);
pkt_info.return_info = skb;
status = eth_port_send(mp, &pkt_info);
if ((status == ETH_ERROR) || (status == ETH_QUEUE_FULL))
printk(KERN_ERR "%s: Error on transmitting packet\n",
dev->name);
mp->tx_ring_skbs++;
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
} else {
unsigned int frag;
u32 ipheader;
/* first frag which is skb header */
pkt_info.byte_cnt = skb_headlen(skb);
pkt_info.buf_ptr = pci_map_single(0, skb->data,
skb_headlen(skb), PCI_DMA_TODEVICE);
pkt_info.return_info = 0;
ipheader = skb->nh.iph->ihl << 11;
pkt_info.cmd_sts = ETH_TX_FIRST_DESC |
ETH_GEN_TCP_UDP_CHECKSUM |
ETH_GEN_IP_V_4_CHECKSUM |
ipheader;
/* CPU already calculated pseudo header checksum. So, use it */
pkt_info.l4i_chk = skb->h.th->check;
status = eth_port_send(mp, &pkt_info);
if (status != ETH_OK) {
if ((status == ETH_ERROR))
printk(KERN_ERR "%s: Error on transmitting packet\n", dev->name);
if (status == ETH_QUEUE_FULL)
printk("Error on Queue Full \n");
if (status == ETH_QUEUE_LAST_RESOURCE)
printk("Tx resource error \n");
}
/* Check for the remaining frags */
for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
pkt_info.l4i_chk = 0x0000;
pkt_info.cmd_sts = 0x00000000;
/* Last Frag enables interrupt and frees the skb */
if (frag == (skb_shinfo(skb)->nr_frags - 1)) {
pkt_info.cmd_sts |= ETH_TX_ENABLE_INTERRUPT |
ETH_TX_LAST_DESC;
pkt_info.return_info = skb;
mp->tx_ring_skbs++;
}
else {
pkt_info.return_info = 0;
}
pkt_info.byte_cnt = this_frag->size;
if (this_frag->size < 8)
printk("%d : \n", skb_shinfo(skb)->nr_frags);
pkt_info.buf_ptr = pci_map_page(NULL, this_frag->page,
this_frag->page_offset,
this_frag->size, PCI_DMA_TODEVICE);
status = eth_port_send(mp, &pkt_info);
if (status != ETH_OK) {
if ((status == ETH_ERROR))
printk(KERN_ERR "%s: Error on transmitting packet\n", dev->name);
if (status == ETH_QUEUE_LAST_RESOURCE)
printk("Tx resource error \n");
if (status == ETH_QUEUE_FULL)
printk("Queue is full \n");
}
}
}
#endif
/* Check if TX queue can handle another skb. If not, then
* signal higher layers to stop requesting TX
*/
if (MV64340_TX_QUEUE_SIZE <= (mp->tx_ring_skbs + 1))
/*
* Stop getting skb's from upper layers.
* Getting skb's from upper layers will be enabled again after
* packets are released.
*/
netif_stop_queue(dev);
/* Update statistics and start of transmittion time */
stats->tx_bytes += skb->len;
stats->tx_packets++;
dev->trans_start = jiffies;
spin_unlock_irqrestore(&mp->lock, flags);
return 0; /* success */
}
/*
* mv64340_eth_get_stats
*
* Returns a pointer to the interface statistics.
*
* Input : dev - a pointer to the required interface
*
* Output : a pointer to the interface's statistics
*/
static struct net_device_stats *mv64340_eth_get_stats(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
return &mp->stats;
}
/*/
* mv64340_eth_init
*
* First function called after registering the network device.
* It's purpose is to initialize the device as an ethernet device,
* fill the structure that was given in registration with pointers
* to functions, and setting the MAC address of the interface
*
* Input : number of port to initialize
* Output : -ENONMEM if failed , 0 if success
*/
static struct net_device *mv64340_eth_init(int port_num)
{
struct mv64340_private *mp;
struct net_device *dev;
int err;
dev = alloc_etherdev(sizeof(struct mv64340_private));
if (!dev)
return NULL;
mp = netdev_priv(dev);
dev->irq = ETH_PORT0_IRQ_NUM + port_num;
dev->open = mv64340_eth_open;
dev->stop = mv64340_eth_stop;
dev->hard_start_xmit = mv64340_eth_start_xmit;
dev->get_stats = mv64340_eth_get_stats;
dev->set_mac_address = mv64340_eth_set_mac_address;
dev->set_multicast_list = mv64340_eth_set_rx_mode;
/* No need to Tx Timeout */
dev->tx_timeout = mv64340_eth_tx_timeout;
#ifdef MV64340_NAPI
dev->poll = mv64340_poll;
dev->weight = 64;
#endif
dev->watchdog_timeo = 2 * HZ;
dev->tx_queue_len = MV64340_TX_QUEUE_SIZE;
dev->base_addr = 0;
dev->change_mtu = mv64340_eth_change_mtu;
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
#ifdef MAX_SKB_FRAGS
#ifndef CONFIG_JAGUAR_DMALOW
/*
* Zero copy can only work if we use Discovery II memory. Else, we will
* have to map the buffers to ISA memory which is only 16 MB
*/
dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HW_CSUM;
#endif
#endif
#endif
mp->port_num = port_num;
/* Configure the timeout task */
INIT_WORK(&mp->tx_timeout_task,
(void (*)(void *))mv64340_eth_tx_timeout_task, dev);
spin_lock_init(&mp->lock);
/* set MAC addresses */
memcpy(dev->dev_addr, prom_mac_addr_base, 6);
dev->dev_addr[5] += port_num;
err = register_netdev(dev);
if (err)
goto out_free_dev;
printk(KERN_NOTICE "%s: port %d with MAC address %02x:%02x:%02x:%02x:%02x:%02x\n",
dev->name, port_num,
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
if (dev->features & NETIF_F_SG)
printk("Scatter Gather Enabled ");
if (dev->features & NETIF_F_IP_CSUM)
printk("TX TCP/IP Checksumming Supported \n");
printk("RX TCP/UDP Checksum Offload ON, \n");
printk("TX and RX Interrupt Coalescing ON \n");
#ifdef MV64340_NAPI
printk("RX NAPI Enabled \n");
#endif
return dev;
out_free_dev:
free_netdev(dev);
return NULL;
}
static void mv64340_eth_remove(struct net_device *dev)
{
struct mv64340_private *mp = netdev_priv(dev);
unregister_netdev(dev);
flush_scheduled_work();
free_netdev(dev);
}
static struct net_device *mv64340_dev0;
static struct net_device *mv64340_dev1;
static struct net_device *mv64340_dev2;
/*
* mv64340_init_module
*
* Registers the network drivers into the Linux kernel
*
* Input : N/A
*
* Output : N/A
*/
static int __init mv64340_init_module(void)
{
printk(KERN_NOTICE "MV-643xx 10/100/1000 Ethernet Driver\n");
#ifdef CONFIG_MV643XX_ETH_0
mv64340_dev0 = mv64340_eth_init(0);
if (!mv64340_dev0) {
printk(KERN_ERR
"Error registering MV-64360 ethernet port 0\n");
}
#endif
#ifdef CONFIG_MV643XX_ETH_1
mv64340_dev1 = mv64340_eth_init(1);
if (!mv64340_dev1) {
printk(KERN_ERR
"Error registering MV-64360 ethernet port 1\n");
}
#endif
#ifdef CONFIG_MV643XX_ETH_2
mv64340_dev2 = mv64340_eth_init(2);
if (!mv64340_dev2) {
printk(KERN_ERR
"Error registering MV-64360 ethernet port 2\n");
}
#endif
return 0;
}
/*
* mv64340_cleanup_module
*
* Registers the network drivers into the Linux kernel
*
* Input : N/A
*
* Output : N/A
*/
static void __exit mv64340_cleanup_module(void)
{
if (mv64340_dev2)
mv64340_eth_remove(mv64340_dev2);
if (mv64340_dev1)
mv64340_eth_remove(mv64340_dev1);
if (mv64340_dev0)
mv64340_eth_remove(mv64340_dev0);
}
module_init(mv64340_init_module);
module_exit(mv64340_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rabeeh Khoury, Assaf Hoffman, Matthew Dharm and Manish Lachwani");
MODULE_DESCRIPTION("Ethernet driver for Marvell MV64340");
/*
* The second part is the low level driver of the gigE ethernet ports.
*/
/*
* Marvell's Gigabit Ethernet controller low level driver
*
* DESCRIPTION:
* This file introduce low level API to Marvell's Gigabit Ethernet
* controller. This Gigabit Ethernet Controller driver API controls
* 1) Operations (i.e. port init, start, reset etc').
* 2) Data flow (i.e. port send, receive etc').
* Each Gigabit Ethernet port is controlled via
* struct mv64340_private.
* This struct includes user configuration information as well as
* driver internal data needed for its operations.
*
* Supported Features:
* - This low level driver is OS independent. Allocating memory for
* the descriptor rings and buffers are not within the scope of
* this driver.
* - The user is free from Rx/Tx queue managing.
* - This low level driver introduce functionality API that enable
* the to operate Marvell's Gigabit Ethernet Controller in a
* convenient way.
* - Simple Gigabit Ethernet port operation API.
* - Simple Gigabit Ethernet port data flow API.
* - Data flow and operation API support per queue functionality.
* - Support cached descriptors for better performance.
* - Enable access to all four DRAM banks and internal SRAM memory
* spaces.
* - PHY access and control API.
* - Port control register configuration API.
* - Full control over Unicast and Multicast MAC configurations.
*
* Operation flow:
*
* Initialization phase
* This phase complete the initialization of the the mv64340_private
* struct.
* User information regarding port configuration has to be set
* prior to calling the port initialization routine.
*
* In this phase any port Tx/Rx activity is halted, MIB counters
* are cleared, PHY address is set according to user parameter and
* access to DRAM and internal SRAM memory spaces.
*
* Driver ring initialization
* Allocating memory for the descriptor rings and buffers is not
* within the scope of this driver. Thus, the user is required to
* allocate memory for the descriptors ring and buffers. Those
* memory parameters are used by the Rx and Tx ring initialization
* routines in order to curve the descriptor linked list in a form
* of a ring.
* Note: Pay special attention to alignment issues when using
* cached descriptors/buffers. In this phase the driver store
* information in the mv64340_private struct regarding each queue
* ring.
*
* Driver start
* This phase prepares the Ethernet port for Rx and Tx activity.
* It uses the information stored in the mv64340_private struct to
* initialize the various port registers.
*
* Data flow:
* All packet references to/from the driver are done using
* struct pkt_info.
* This struct is a unified struct used with Rx and Tx operations.
* This way the user is not required to be familiar with neither
* Tx nor Rx descriptors structures.
* The driver's descriptors rings are management by indexes.
* Those indexes controls the ring resources and used to indicate
* a SW resource error:
* 'current'
* This index points to the current available resource for use. For
* example in Rx process this index will point to the descriptor
* that will be passed to the user upon calling the receive routine.
* In Tx process, this index will point to the descriptor
* that will be assigned with the user packet info and transmitted.
* 'used'
* This index points to the descriptor that need to restore its
* resources. For example in Rx process, using the Rx buffer return
* API will attach the buffer returned in packet info to the
* descriptor pointed by 'used'. In Tx process, using the Tx
* descriptor return will merely return the user packet info with
* the command status of the transmitted buffer pointed by the
* 'used' index. Nevertheless, it is essential to use this routine
* to update the 'used' index.
* 'first'
* This index supports Tx Scatter-Gather. It points to the first
* descriptor of a packet assembled of multiple buffers. For example
* when in middle of Such packet we have a Tx resource error the
* 'curr' index get the value of 'first' to indicate that the ring
* returned to its state before trying to transmit this packet.
*
* Receive operation:
* The eth_port_receive API set the packet information struct,
* passed by the caller, with received information from the
* 'current' SDMA descriptor.
* It is the user responsibility to return this resource back
* to the Rx descriptor ring to enable the reuse of this source.
* Return Rx resource is done using the eth_rx_return_buff API.
*
* Transmit operation:
* The eth_port_send API supports Scatter-Gather which enables to
* send a packet spanned over multiple buffers. This means that
* for each packet info structure given by the user and put into
* the Tx descriptors ring, will be transmitted only if the 'LAST'
* bit will be set in the packet info command status field. This
* API also consider restriction regarding buffer alignments and
* sizes.
* The user must return a Tx resource after ensuring the buffer
* has been transmitted to enable the Tx ring indexes to update.
*
* BOARD LAYOUT
* This device is on-board. No jumper diagram is necessary.
*
* EXTERNAL INTERFACE
*
* Prior to calling the initialization routine eth_port_init() the user
* must set the following fields under mv64340_private struct:
* port_num User Ethernet port number.
* port_mac_addr[6] User defined port MAC address.
* port_config User port configuration value.
* port_config_extend User port config extend value.
* port_sdma_config User port SDMA config value.
* port_serial_control User port serial control value.
*
* This driver introduce a set of default values:
* PORT_CONFIG_VALUE Default port configuration value
* PORT_CONFIG_EXTEND_VALUE Default port extend configuration value
* PORT_SDMA_CONFIG_VALUE Default sdma control value
* PORT_SERIAL_CONTROL_VALUE Default port serial control value
*
* This driver data flow is done using the struct pkt_info which
* is a unified struct for Rx and Tx operations:
*
* byte_cnt Tx/Rx descriptor buffer byte count.
* l4i_chk CPU provided TCP Checksum. For Tx operation
* only.
* cmd_sts Tx/Rx descriptor command status.
* buf_ptr Tx/Rx descriptor buffer pointer.
* return_info Tx/Rx user resource return information.
*/
/* defines */
/* SDMA command macros */
#define ETH_ENABLE_TX_QUEUE(eth_port) \
MV_WRITE(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port), 1)
#define ETH_DISABLE_TX_QUEUE(eth_port) \
MV_WRITE(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port), \
(1 << 8))
#define ETH_ENABLE_RX_QUEUE(rx_queue, eth_port) \
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG(eth_port), \
(1 << rx_queue))
#define ETH_DISABLE_RX_QUEUE(rx_queue, eth_port) \
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG(eth_port), \
(1 << (8 + rx_queue)))
#define LINK_UP_TIMEOUT 100000
#define PHY_BUSY_TIMEOUT 10000000
/* locals */
/* PHY routines */
static int ethernet_phy_get(unsigned int eth_port_num);
/* Ethernet Port routines */
static int eth_port_uc_addr(unsigned int eth_port_num, unsigned char uc_nibble,
int option);
/*
* eth_port_init - Initialize the Ethernet port driver
*
* DESCRIPTION:
* This function prepares the ethernet port to start its activity:
* 1) Completes the ethernet port driver struct initialization toward port
* start routine.
* 2) Resets the device to a quiescent state in case of warm reboot.
* 3) Enable SDMA access to all four DRAM banks as well as internal SRAM.
* 4) Clean MAC tables. The reset status of those tables is unknown.
* 5) Set PHY address.
* Note: Call this routine prior to eth_port_start routine and after
* setting user values in the user fields of Ethernet port control
* struct.
*
* INPUT:
* struct mv64340_private *mp Ethernet port control struct
*
* OUTPUT:
* See description.
*
* RETURN:
* None.
*/
static void eth_port_init(struct mv64340_private * mp)
{
mp->port_config = PORT_CONFIG_VALUE;
mp->port_config_extend = PORT_CONFIG_EXTEND_VALUE;
#if defined(__BIG_ENDIAN)
mp->port_sdma_config = PORT_SDMA_CONFIG_VALUE;
#elif defined(__LITTLE_ENDIAN)
mp->port_sdma_config = PORT_SDMA_CONFIG_VALUE |
ETH_BLM_RX_NO_SWAP | ETH_BLM_TX_NO_SWAP;
#else
#error One of __LITTLE_ENDIAN or __BIG_ENDIAN must be defined!
#endif
mp->port_serial_control = PORT_SERIAL_CONTROL_VALUE;
mp->port_rx_queue_command = 0;
mp->port_tx_queue_command = 0;
mp->rx_resource_err = 0;
mp->tx_resource_err = 0;
eth_port_reset(mp->port_num);
eth_port_init_mac_tables(mp->port_num);
ethernet_phy_reset(mp->port_num);
}
/*
* eth_port_start - Start the Ethernet port activity.
*
* DESCRIPTION:
* This routine prepares the Ethernet port for Rx and Tx activity:
* 1. Initialize Tx and Rx Current Descriptor Pointer for each queue that
* has been initialized a descriptor's ring (using
* ether_init_tx_desc_ring for Tx and ether_init_rx_desc_ring for Rx)
* 2. Initialize and enable the Ethernet configuration port by writing to
* the port's configuration and command registers.
* 3. Initialize and enable the SDMA by writing to the SDMA's
* configuration and command registers. After completing these steps,
* the ethernet port SDMA can starts to perform Rx and Tx activities.
*
* Note: Each Rx and Tx queue descriptor's list must be initialized prior
* to calling this function (use ether_init_tx_desc_ring for Tx queues
* and ether_init_rx_desc_ring for Rx queues).
*
* INPUT:
* struct mv64340_private *mp Ethernet port control struct
*
* OUTPUT:
* Ethernet port is ready to receive and transmit.
*
* RETURN:
* false if the port PHY is not up.
* true otherwise.
*/
static int eth_port_start(struct mv64340_private *mp)
{
unsigned int eth_port_num = mp->port_num;
int tx_curr_desc, rx_curr_desc;
unsigned int phy_reg_data;
/* Assignment of Tx CTRP of given queue */
tx_curr_desc = mp->tx_curr_desc_q;
MV_WRITE(MV64340_ETH_TX_CURRENT_QUEUE_DESC_PTR_0(eth_port_num),
(struct eth_tx_desc *) mp->tx_desc_dma + tx_curr_desc);
/* Assignment of Rx CRDP of given queue */
rx_curr_desc = mp->rx_curr_desc_q;
MV_WRITE(MV64340_ETH_RX_CURRENT_QUEUE_DESC_PTR_0(eth_port_num),
(struct eth_rx_desc *) mp->rx_desc_dma + rx_curr_desc);
/* Add the assigned Ethernet address to the port's address table */
eth_port_uc_addr_set(mp->port_num, mp->port_mac_addr);
/* Assign port configuration and command. */
MV_WRITE(MV64340_ETH_PORT_CONFIG_REG(eth_port_num),
mp->port_config);
MV_WRITE(MV64340_ETH_PORT_CONFIG_EXTEND_REG(eth_port_num),
mp->port_config_extend);
MV_WRITE(MV64340_ETH_PORT_SERIAL_CONTROL_REG(eth_port_num),
mp->port_serial_control);
MV_SET_REG_BITS(MV64340_ETH_PORT_SERIAL_CONTROL_REG(eth_port_num),
ETH_SERIAL_PORT_ENABLE);
/* Assign port SDMA configuration */
MV_WRITE(MV64340_ETH_SDMA_CONFIG_REG(eth_port_num),
mp->port_sdma_config);
/* Enable port Rx. */
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG(eth_port_num),
mp->port_rx_queue_command);
/* Check if link is up */
eth_port_read_smi_reg(eth_port_num, 1, &phy_reg_data);
if (!(phy_reg_data & 0x20))
return 0;
return 1;
}
/*
* eth_port_uc_addr_set - This function Set the port Unicast address.
*
* DESCRIPTION:
* This function Set the port Ethernet MAC address.
*
* INPUT:
* unsigned int eth_port_num Port number.
* char * p_addr Address to be set
*
* OUTPUT:
* Set MAC address low and high registers. also calls eth_port_uc_addr()
* To set the unicast table with the proper information.
*
* RETURN:
* N/A.
*
*/
static void eth_port_uc_addr_set(unsigned int eth_port_num,
unsigned char *p_addr)
{
unsigned int mac_h;
unsigned int mac_l;
mac_l = (p_addr[4] << 8) | (p_addr[5]);
mac_h = (p_addr[0] << 24) | (p_addr[1] << 16) |
(p_addr[2] << 8) | (p_addr[3] << 0);
MV_WRITE(MV64340_ETH_MAC_ADDR_LOW(eth_port_num), mac_l);
MV_WRITE(MV64340_ETH_MAC_ADDR_HIGH(eth_port_num), mac_h);
/* Accept frames of this address */
eth_port_uc_addr(eth_port_num, p_addr[5], ACCEPT_MAC_ADDR);
return;
}
/*
* eth_port_uc_addr - This function Set the port unicast address table
*
* DESCRIPTION:
* This function locates the proper entry in the Unicast table for the
* specified MAC nibble and sets its properties according to function
* parameters.
*
* INPUT:
* unsigned int eth_port_num Port number.
* unsigned char uc_nibble Unicast MAC Address last nibble.
* int option 0 = Add, 1 = remove address.
*
* OUTPUT:
* This function add/removes MAC addresses from the port unicast address
* table.
*
* RETURN:
* true is output succeeded.
* false if option parameter is invalid.
*
*/
static int eth_port_uc_addr(unsigned int eth_port_num,
unsigned char uc_nibble, int option)
{
unsigned int unicast_reg;
unsigned int tbl_offset;
unsigned int reg_offset;
/* Locate the Unicast table entry */
uc_nibble = (0xf & uc_nibble);
tbl_offset = (uc_nibble / 4) * 4; /* Register offset from unicast table base */
reg_offset = uc_nibble % 4; /* Entry offset within the above register */
switch (option) {
case REJECT_MAC_ADDR:
/* Clear accepts frame bit at specified unicast DA table entry */
unicast_reg = MV_READ((MV64340_ETH_DA_FILTER_UNICAST_TABLE_BASE
(eth_port_num) + tbl_offset));
unicast_reg &= (0x0E << (8 * reg_offset));
MV_WRITE(
(MV64340_ETH_DA_FILTER_UNICAST_TABLE_BASE
(eth_port_num) + tbl_offset), unicast_reg);
break;
case ACCEPT_MAC_ADDR:
/* Set accepts frame bit at unicast DA filter table entry */
unicast_reg =
MV_READ(
(MV64340_ETH_DA_FILTER_UNICAST_TABLE_BASE
(eth_port_num) + tbl_offset));
unicast_reg |= (0x01 << (8 * reg_offset));
MV_WRITE(
(MV64340_ETH_DA_FILTER_UNICAST_TABLE_BASE
(eth_port_num) + tbl_offset), unicast_reg);
break;
default:
return 0;
}
return 1;
}
/*
* eth_port_init_mac_tables - Clear all entrance in the UC, SMC and OMC tables
*
* DESCRIPTION:
* Go through all the DA filter tables (Unicast, Special Multicast &
* Other Multicast) and set each entry to 0.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* Multicast and Unicast packets are rejected.
*
* RETURN:
* None.
*/
static void eth_port_init_mac_tables(unsigned int eth_port_num)
{
int table_index;
/* Clear DA filter unicast table (Ex_dFUT) */
for (table_index = 0; table_index <= 0xC; table_index += 4)
MV_WRITE(
(MV64340_ETH_DA_FILTER_UNICAST_TABLE_BASE
(eth_port_num) + table_index), 0);
for (table_index = 0; table_index <= 0xFC; table_index += 4) {
/* Clear DA filter special multicast table (Ex_dFSMT) */
MV_WRITE(
(MV64340_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
(eth_port_num) + table_index), 0);
/* Clear DA filter other multicast table (Ex_dFOMT) */
MV_WRITE((MV64340_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE
(eth_port_num) + table_index), 0);
}
}
/*
* eth_clear_mib_counters - Clear all MIB counters
*
* DESCRIPTION:
* This function clears all MIB counters of a specific ethernet port.
* A read from the MIB counter will reset the counter.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* After reading all MIB counters, the counters resets.
*
* RETURN:
* MIB counter value.
*
*/
static void eth_clear_mib_counters(unsigned int eth_port_num)
{
int i;
/* Perform dummy reads from MIB counters */
for (i = ETH_MIB_GOOD_OCTETS_RECEIVED_LOW; i < ETH_MIB_LATE_COLLISION; i += 4)
MV_READ(MV64340_ETH_MIB_COUNTERS_BASE(eth_port_num) + i);
}
/*
* ethernet_phy_get - Get the ethernet port PHY address.
*
* DESCRIPTION:
* This routine returns the given ethernet port PHY address.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* None.
*
* RETURN:
* PHY address.
*
*/
static int ethernet_phy_get(unsigned int eth_port_num)
{
unsigned int reg_data;
reg_data = MV_READ(MV64340_ETH_PHY_ADDR_REG);
return ((reg_data >> (5 * eth_port_num)) & 0x1f);
}
/*
* ethernet_phy_reset - Reset Ethernet port PHY.
*
* DESCRIPTION:
* This routine utilize the SMI interface to reset the ethernet port PHY.
* The routine waits until the link is up again or link up is timeout.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* The ethernet port PHY renew its link.
*
* RETURN:
* None.
*
*/
static int ethernet_phy_reset(unsigned int eth_port_num)
{
unsigned int time_out = 50;
unsigned int phy_reg_data;
/* Reset the PHY */
eth_port_read_smi_reg(eth_port_num, 0, &phy_reg_data);
phy_reg_data |= 0x8000; /* Set bit 15 to reset the PHY */
eth_port_write_smi_reg(eth_port_num, 0, phy_reg_data);
/* Poll on the PHY LINK */
do {
eth_port_read_smi_reg(eth_port_num, 1, &phy_reg_data);
if (time_out-- == 0)
return 0;
} while (!(phy_reg_data & 0x20));
return 1;
}
/*
* eth_port_reset - Reset Ethernet port
*
* DESCRIPTION:
* This routine resets the chip by aborting any SDMA engine activity and
* clearing the MIB counters. The Receiver and the Transmit unit are in
* idle state after this command is performed and the port is disabled.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* Channel activity is halted.
*
* RETURN:
* None.
*
*/
static void eth_port_reset(unsigned int eth_port_num)
{
unsigned int reg_data;
/* Stop Tx port activity. Check port Tx activity. */
reg_data =
MV_READ(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port_num));
if (reg_data & 0xFF) {
/* Issue stop command for active channels only */
MV_WRITE(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG
(eth_port_num), (reg_data << 8));
/* Wait for all Tx activity to terminate. */
do {
/* Check port cause register that all Tx queues are stopped */
reg_data =
MV_READ
(MV64340_ETH_TRANSMIT_QUEUE_COMMAND_REG
(eth_port_num));
}
while (reg_data & 0xFF);
}
/* Stop Rx port activity. Check port Rx activity. */
reg_data =
MV_READ(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG
(eth_port_num));
if (reg_data & 0xFF) {
/* Issue stop command for active channels only */
MV_WRITE(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG
(eth_port_num), (reg_data << 8));
/* Wait for all Rx activity to terminate. */
do {
/* Check port cause register that all Rx queues are stopped */
reg_data =
MV_READ
(MV64340_ETH_RECEIVE_QUEUE_COMMAND_REG
(eth_port_num));
}
while (reg_data & 0xFF);
}
/* Clear all MIB counters */
eth_clear_mib_counters(eth_port_num);
/* Reset the Enable bit in the Configuration Register */
reg_data =
MV_READ(MV64340_ETH_PORT_SERIAL_CONTROL_REG (eth_port_num));
reg_data &= ~ETH_SERIAL_PORT_ENABLE;
MV_WRITE(MV64340_ETH_PORT_SERIAL_CONTROL_REG(eth_port_num), reg_data);
return;
}
/*
* ethernet_set_config_reg - Set specified bits in configuration register.
*
* DESCRIPTION:
* This function sets specified bits in the given ethernet
* configuration register.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
* unsigned int value 32 bit value.
*
* OUTPUT:
* The set bits in the value parameter are set in the configuration
* register.
*
* RETURN:
* None.
*
*/
static void ethernet_set_config_reg(unsigned int eth_port_num,
unsigned int value)
{
unsigned int eth_config_reg;
eth_config_reg =
MV_READ(MV64340_ETH_PORT_CONFIG_REG(eth_port_num));
eth_config_reg |= value;
MV_WRITE(MV64340_ETH_PORT_CONFIG_REG(eth_port_num),
eth_config_reg);
}
/*
* ethernet_get_config_reg - Get the port configuration register
*
* DESCRIPTION:
* This function returns the configuration register value of the given
* ethernet port.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
*
* OUTPUT:
* None.
*
* RETURN:
* Port configuration register value.
*/
static unsigned int ethernet_get_config_reg(unsigned int eth_port_num)
{
unsigned int eth_config_reg;
eth_config_reg = MV_READ(MV64340_ETH_PORT_CONFIG_EXTEND_REG
(eth_port_num));
return eth_config_reg;
}
/*
* eth_port_read_smi_reg - Read PHY registers
*
* DESCRIPTION:
* This routine utilize the SMI interface to interact with the PHY in
* order to perform PHY register read.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
* unsigned int phy_reg PHY register address offset.
* unsigned int *value Register value buffer.
*
* OUTPUT:
* Write the value of a specified PHY register into given buffer.
*
* RETURN:
* false if the PHY is busy or read data is not in valid state.
* true otherwise.
*
*/
static int eth_port_read_smi_reg(unsigned int eth_port_num,
unsigned int phy_reg, unsigned int *value)
{
int phy_addr = ethernet_phy_get(eth_port_num);
unsigned int time_out = PHY_BUSY_TIMEOUT;
unsigned int reg_value;
/* first check that it is not busy */
do {
reg_value = MV_READ(MV64340_ETH_SMI_REG);
if (time_out-- == 0)
return 0;
} while (reg_value & ETH_SMI_BUSY);
/* not busy */
MV_WRITE(MV64340_ETH_SMI_REG,
(phy_addr << 16) | (phy_reg << 21) | ETH_SMI_OPCODE_READ);
time_out = PHY_BUSY_TIMEOUT; /* initialize the time out var again */
do {
reg_value = MV_READ(MV64340_ETH_SMI_REG);
if (time_out-- == 0)
return 0;
} while (reg_value & ETH_SMI_READ_VALID);
/* Wait for the data to update in the SMI register */
for (time_out = 0; time_out < PHY_BUSY_TIMEOUT; time_out++);
reg_value = MV_READ(MV64340_ETH_SMI_REG);
*value = reg_value & 0xffff;
return 1;
}
/*
* eth_port_write_smi_reg - Write to PHY registers
*
* DESCRIPTION:
* This routine utilize the SMI interface to interact with the PHY in
* order to perform writes to PHY registers.
*
* INPUT:
* unsigned int eth_port_num Ethernet Port number.
* unsigned int phy_reg PHY register address offset.
* unsigned int value Register value.
*
* OUTPUT:
* Write the given value to the specified PHY register.
*
* RETURN:
* false if the PHY is busy.
* true otherwise.
*
*/
static int eth_port_write_smi_reg(unsigned int eth_port_num,
unsigned int phy_reg, unsigned int value)
{
unsigned int time_out = PHY_BUSY_TIMEOUT;
unsigned int reg_value;
int phy_addr;
phy_addr = ethernet_phy_get(eth_port_num);
/* first check that it is not busy */
do {
reg_value = MV_READ(MV64340_ETH_SMI_REG);
if (time_out-- == 0)
return 0;
} while (reg_value & ETH_SMI_BUSY);
/* not busy */
MV_WRITE(MV64340_ETH_SMI_REG, (phy_addr << 16) | (phy_reg << 21) |
ETH_SMI_OPCODE_WRITE | (value & 0xffff));
return 1;
}
/*
* eth_port_send - Send an Ethernet packet
*
* DESCRIPTION:
* This routine send a given packet described by p_pktinfo parameter. It
* supports transmitting of a packet spaned over multiple buffers. The
* routine updates 'curr' and 'first' indexes according to the packet
* segment passed to the routine. In case the packet segment is first,
* the 'first' index is update. In any case, the 'curr' index is updated.
* If the routine get into Tx resource error it assigns 'curr' index as
* 'first'. This way the function can abort Tx process of multiple
* descriptors per packet.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* struct pkt_info *p_pkt_info User packet buffer.
*
* OUTPUT:
* Tx ring 'curr' and 'first' indexes are updated.
*
* RETURN:
* ETH_QUEUE_FULL in case of Tx resource error.
* ETH_ERROR in case the routine can not access Tx desc ring.
* ETH_QUEUE_LAST_RESOURCE if the routine uses the last Tx resource.
* ETH_OK otherwise.
*
*/
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
/*
* Modified to include the first descriptor pointer in case of SG
*/
static ETH_FUNC_RET_STATUS eth_port_send(struct mv64340_private * mp,
struct pkt_info * p_pkt_info)
{
int tx_desc_curr, tx_desc_used, tx_first_desc, tx_next_desc;
volatile struct eth_tx_desc *current_descriptor;
volatile struct eth_tx_desc *first_descriptor;
u32 command_status, first_chip_ptr;
/* Do not process Tx ring in case of Tx ring resource error */
if (mp->tx_resource_err)
return ETH_QUEUE_FULL;
/* Get the Tx Desc ring indexes */
tx_desc_curr = mp->tx_curr_desc_q;
tx_desc_used = mp->tx_used_desc_q;
current_descriptor = &mp->p_tx_desc_area[tx_desc_curr];
if (current_descriptor == NULL)
return ETH_ERROR;
tx_next_desc = (tx_desc_curr + 1) % MV64340_TX_QUEUE_SIZE;
command_status = p_pkt_info->cmd_sts | ETH_ZERO_PADDING | ETH_GEN_CRC;
if (command_status & ETH_TX_FIRST_DESC) {
tx_first_desc = tx_desc_curr;
mp->tx_first_desc_q = tx_first_desc;
/* fill first descriptor */
first_descriptor = &mp->p_tx_desc_area[tx_desc_curr];
first_descriptor->l4i_chk = p_pkt_info->l4i_chk;
first_descriptor->cmd_sts = command_status;
first_descriptor->byte_cnt = p_pkt_info->byte_cnt;
first_descriptor->buf_ptr = p_pkt_info->buf_ptr;
first_descriptor->next_desc_ptr = mp->tx_desc_dma +
tx_next_desc * sizeof(struct eth_tx_desc);
wmb();
} else {
tx_first_desc = mp->tx_first_desc_q;
first_descriptor = &mp->p_tx_desc_area[tx_first_desc];
if (first_descriptor == NULL) {
printk("First desc is NULL !!\n");
return ETH_ERROR;
}
if (command_status & ETH_TX_LAST_DESC)
current_descriptor->next_desc_ptr = 0x00000000;
else {
command_status |= ETH_BUFFER_OWNED_BY_DMA;
current_descriptor->next_desc_ptr = mp->tx_desc_dma +
tx_next_desc * sizeof(struct eth_tx_desc);
}
}
if (p_pkt_info->byte_cnt < 8) {
printk(" < 8 problem \n");
return ETH_ERROR;
}
current_descriptor->buf_ptr = p_pkt_info->buf_ptr;
current_descriptor->byte_cnt = p_pkt_info->byte_cnt;
current_descriptor->l4i_chk = p_pkt_info->l4i_chk;
current_descriptor->cmd_sts = command_status;
mp->tx_skb[tx_desc_curr] = (struct sk_buff*) p_pkt_info->return_info;
wmb();
/* Set last desc with DMA ownership and interrupt enable. */
if (command_status & ETH_TX_LAST_DESC) {
current_descriptor->cmd_sts = command_status |
ETH_TX_ENABLE_INTERRUPT |
ETH_BUFFER_OWNED_BY_DMA;
if (!(command_status & ETH_TX_FIRST_DESC))
first_descriptor->cmd_sts |= ETH_BUFFER_OWNED_BY_DMA;
wmb();
first_chip_ptr = MV_READ(MV64340_ETH_CURRENT_SERVED_TX_DESC_PTR(mp->port_num));
/* Apply send command */
if (first_chip_ptr == 0x00000000)
MV_WRITE(MV64340_ETH_TX_CURRENT_QUEUE_DESC_PTR_0(mp->port_num), (struct eth_tx_desc *) mp->tx_desc_dma + tx_first_desc);
ETH_ENABLE_TX_QUEUE(mp->port_num);
/*
* Finish Tx packet. Update first desc in case of Tx resource
* error */
tx_first_desc = tx_next_desc;
mp->tx_first_desc_q = tx_first_desc;
} else {
if (! (command_status & ETH_TX_FIRST_DESC) ) {
current_descriptor->cmd_sts = command_status;
wmb();
}
}
/* Check for ring index overlap in the Tx desc ring */
if (tx_next_desc == tx_desc_used) {
mp->tx_resource_err = 1;
mp->tx_curr_desc_q = tx_first_desc;
return ETH_QUEUE_LAST_RESOURCE;
}
mp->tx_curr_desc_q = tx_next_desc;
wmb();
return ETH_OK;
}
#else
static ETH_FUNC_RET_STATUS eth_port_send(struct mv64340_private * mp,
struct pkt_info * p_pkt_info)
{
int tx_desc_curr;
int tx_desc_used;
volatile struct eth_tx_desc* current_descriptor;
unsigned int command_status;
/* Do not process Tx ring in case of Tx ring resource error */
if (mp->tx_resource_err)
return ETH_QUEUE_FULL;
/* Get the Tx Desc ring indexes */
tx_desc_curr = mp->tx_curr_desc_q;
tx_desc_used = mp->tx_used_desc_q;
current_descriptor = &mp->p_tx_desc_area[tx_desc_curr];
if (current_descriptor == NULL)
return ETH_ERROR;
command_status = p_pkt_info->cmd_sts | ETH_ZERO_PADDING | ETH_GEN_CRC;
/* XXX Is this for real ?!?!? */
/* Buffers with a payload smaller than 8 bytes must be aligned to a
* 64-bit boundary. We use the memory allocated for Tx descriptor.
* This memory is located in TX_BUF_OFFSET_IN_DESC offset within the
* Tx descriptor. */
if (p_pkt_info->byte_cnt <= 8) {
printk(KERN_ERR
"You have failed in the < 8 bytes errata - fixme\n");
return ETH_ERROR;
}
current_descriptor->buf_ptr = p_pkt_info->buf_ptr;
current_descriptor->byte_cnt = p_pkt_info->byte_cnt;
mp->tx_skb[tx_desc_curr] = (struct sk_buff *) p_pkt_info->return_info;
mb();
/* Set last desc with DMA ownership and interrupt enable. */
current_descriptor->cmd_sts = command_status |
ETH_BUFFER_OWNED_BY_DMA | ETH_TX_ENABLE_INTERRUPT;
/* Apply send command */
ETH_ENABLE_TX_QUEUE(mp->port_num);
/* Finish Tx packet. Update first desc in case of Tx resource error */
tx_desc_curr = (tx_desc_curr + 1) % MV64340_TX_QUEUE_SIZE;
/* Update the current descriptor */
mp->tx_curr_desc_q = tx_desc_curr;
/* Check for ring index overlap in the Tx desc ring */
if (tx_desc_curr == tx_desc_used) {
mp->tx_resource_err = 1;
return ETH_QUEUE_LAST_RESOURCE;
}
return ETH_OK;
}
#endif
/*
* eth_tx_return_desc - Free all used Tx descriptors
*
* DESCRIPTION:
* This routine returns the transmitted packet information to the caller.
* It uses the 'first' index to support Tx desc return in case a transmit
* of a packet spanned over multiple buffer still in process.
* In case the Tx queue was in "resource error" condition, where there are
* no available Tx resources, the function resets the resource error flag.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* struct pkt_info *p_pkt_info User packet buffer.
*
* OUTPUT:
* Tx ring 'first' and 'used' indexes are updated.
*
* RETURN:
* ETH_ERROR in case the routine can not access Tx desc ring.
* ETH_RETRY in case there is transmission in process.
* ETH_END_OF_JOB if the routine has nothing to release.
* ETH_OK otherwise.
*
*/
static ETH_FUNC_RET_STATUS eth_tx_return_desc(struct mv64340_private * mp,
struct pkt_info * p_pkt_info)
{
int tx_desc_used, tx_desc_curr;
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
int tx_first_desc;
#endif
volatile struct eth_tx_desc *p_tx_desc_used;
unsigned int command_status;
/* Get the Tx Desc ring indexes */
tx_desc_curr = mp->tx_curr_desc_q;
tx_desc_used = mp->tx_used_desc_q;
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
tx_first_desc = mp->tx_first_desc_q;
#endif
p_tx_desc_used = &mp->p_tx_desc_area[tx_desc_used];
/* XXX Sanity check */
if (p_tx_desc_used == NULL)
return ETH_ERROR;
command_status = p_tx_desc_used->cmd_sts;
/* Still transmitting... */
#ifndef MV64340_CHECKSUM_OFFLOAD_TX
if (command_status & (ETH_BUFFER_OWNED_BY_DMA))
return ETH_RETRY;
#endif
/* Stop release. About to overlap the current available Tx descriptor */
#ifdef MV64340_CHECKSUM_OFFLOAD_TX
if (tx_desc_used == tx_first_desc && !mp->tx_resource_err)
return ETH_END_OF_JOB;
#else
if (tx_desc_used == tx_desc_curr && !mp->tx_resource_err)
return ETH_END_OF_JOB;
#endif
/* Pass the packet information to the caller */
p_pkt_info->cmd_sts = command_status;
p_pkt_info->return_info = mp->tx_skb[tx_desc_used];
mp->tx_skb[tx_desc_used] = NULL;
/* Update the next descriptor to release. */
mp->tx_used_desc_q = (tx_desc_used + 1) % MV64340_TX_QUEUE_SIZE;
/* Any Tx return cancels the Tx resource error status */
mp->tx_resource_err = 0;
return ETH_OK;
}
/*
* eth_port_receive - Get received information from Rx ring.
*
* DESCRIPTION:
* This routine returns the received data to the caller. There is no
* data copying during routine operation. All information is returned
* using pointer to packet information struct passed from the caller.
* If the routine exhausts Rx ring resources then the resource error flag
* is set.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* struct pkt_info *p_pkt_info User packet buffer.
*
* OUTPUT:
* Rx ring current and used indexes are updated.
*
* RETURN:
* ETH_ERROR in case the routine can not access Rx desc ring.
* ETH_QUEUE_FULL if Rx ring resources are exhausted.
* ETH_END_OF_JOB if there is no received data.
* ETH_OK otherwise.
*/
static ETH_FUNC_RET_STATUS eth_port_receive(struct mv64340_private * mp,
struct pkt_info * p_pkt_info)
{
int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
volatile struct eth_rx_desc * p_rx_desc;
unsigned int command_status;
/* Do not process Rx ring in case of Rx ring resource error */
if (mp->rx_resource_err)
return ETH_QUEUE_FULL;
/* Get the Rx Desc ring 'curr and 'used' indexes */
rx_curr_desc = mp->rx_curr_desc_q;
rx_used_desc = mp->rx_used_desc_q;
p_rx_desc = &mp->p_rx_desc_area[rx_curr_desc];
/* The following parameters are used to save readings from memory */
command_status = p_rx_desc->cmd_sts;
/* Nothing to receive... */
if (command_status & (ETH_BUFFER_OWNED_BY_DMA))
return ETH_END_OF_JOB;
p_pkt_info->byte_cnt = (p_rx_desc->byte_cnt) - RX_BUF_OFFSET;
p_pkt_info->cmd_sts = command_status;
p_pkt_info->buf_ptr = (p_rx_desc->buf_ptr) + RX_BUF_OFFSET;
p_pkt_info->return_info = mp->rx_skb[rx_curr_desc];
p_pkt_info->l4i_chk = p_rx_desc->buf_size;
/* Clean the return info field to indicate that the packet has been */
/* moved to the upper layers */
mp->rx_skb[rx_curr_desc] = NULL;
/* Update current index in data structure */
rx_next_curr_desc = (rx_curr_desc + 1) % MV64340_RX_QUEUE_SIZE;
mp->rx_curr_desc_q = rx_next_curr_desc;
/* Rx descriptors exhausted. Set the Rx ring resource error flag */
if (rx_next_curr_desc == rx_used_desc)
mp->rx_resource_err = 1;
mb();
return ETH_OK;
}
/*
* eth_rx_return_buff - Returns a Rx buffer back to the Rx ring.
*
* DESCRIPTION:
* This routine returns a Rx buffer back to the Rx ring. It retrieves the
* next 'used' descriptor and attached the returned buffer to it.
* In case the Rx ring was in "resource error" condition, where there are
* no available Rx resources, the function resets the resource error flag.
*
* INPUT:
* struct mv64340_private *mp Ethernet Port Control srtuct.
* struct pkt_info *p_pkt_info Information on the returned buffer.
*
* OUTPUT:
* New available Rx resource in Rx descriptor ring.
*
* RETURN:
* ETH_ERROR in case the routine can not access Rx desc ring.
* ETH_OK otherwise.
*/
static ETH_FUNC_RET_STATUS eth_rx_return_buff(struct mv64340_private * mp,
struct pkt_info * p_pkt_info)
{
int used_rx_desc; /* Where to return Rx resource */
volatile struct eth_rx_desc* p_used_rx_desc;
/* Get 'used' Rx descriptor */
used_rx_desc = mp->rx_used_desc_q;
p_used_rx_desc = &mp->p_rx_desc_area[used_rx_desc];
p_used_rx_desc->buf_ptr = p_pkt_info->buf_ptr;
p_used_rx_desc->buf_size = p_pkt_info->byte_cnt;
mp->rx_skb[used_rx_desc] = p_pkt_info->return_info;
/* Flush the write pipe */
mb();
/* Return the descriptor to DMA ownership */
p_used_rx_desc->cmd_sts =
ETH_BUFFER_OWNED_BY_DMA | ETH_RX_ENABLE_INTERRUPT;
/* Flush descriptor and CPU pipe */
mb();
/* Move the used descriptor pointer to the next descriptor */
mp->rx_used_desc_q = (used_rx_desc + 1) % MV64340_RX_QUEUE_SIZE;
/* Any Rx return cancels the Rx resource error status */
mp->rx_resource_err = 0;
return ETH_OK;
}
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