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/*
* SBE 2T3E3 synchronous serial card driver for Linux
*
* Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
* This code is based on a driver written by SBE Inc.
*/
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include "2t3e3.h"
void t3e3_init(struct channel *sc)
{
cpld_init(sc);
dc_reset(sc);
dc_init(sc);
exar7250_init(sc);
exar7300_init(sc);
}
int t3e3_if_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct channel *sc = dev_to_priv(dev);
u32 current_write, last_write;
unsigned long flags;
struct sk_buff *skb2;
if (skb == NULL) {
sc->s.out_errors++;
return 0;
}
if (sc->p.transmitter_on != SBE_2T3E3_ON) {
sc->s.out_errors++;
sc->s.out_dropped++;
dev_kfree_skb_any(skb);
return 0;
}
if (sc->s.OOF && sc->p.loopback == SBE_2T3E3_LOOPBACK_NONE) {
sc->s.out_dropped++;
dev_kfree_skb_any(skb);
return 0;
}
spin_lock_irqsave(&sc->ether.tx_lock, flags);
current_write = sc->ether.tx_ring_current_write;
for (skb2 = skb; skb2 != NULL; skb2 = NULL) {
if (skb2->len) {
if ((sc->ether.tx_ring[current_write].tdes1 &
SBE_2T3E3_TX_DESC_BUFFER_1_SIZE) > 0)
break;
current_write = (current_write + 1) % SBE_2T3E3_TX_DESC_RING_SIZE;
/*
* Leave at least 1 tx desc free so that dc_intr_tx() can
* identify empty list
*/
if (current_write == sc->ether.tx_ring_current_read)
break;
}
}
if (skb2 != NULL) {
netif_stop_queue(sc->dev);
sc->ether.tx_full = 1;
dev_dbg(&sc->pdev->dev, "SBE 2T3E3: out of descriptors\n");
spin_unlock_irqrestore(&sc->ether.tx_lock, flags);
return NETDEV_TX_BUSY;
}
current_write = last_write = sc->ether.tx_ring_current_write;
dev_dbg(&sc->pdev->dev, "sending mbuf (current_write = %d)\n",
current_write);
for (skb2 = skb; skb2 != NULL; skb2 = NULL) {
if (skb2->len) {
dev_dbg(&sc->pdev->dev,
"sending mbuf (len = %d, next = %p)\n",
skb2->len, NULL);
sc->ether.tx_free_cnt--;
sc->ether.tx_ring[current_write].tdes0 = 0;
sc->ether.tx_ring[current_write].tdes1 &=
SBE_2T3E3_TX_DESC_END_OF_RING |
SBE_2T3E3_TX_DESC_SECOND_ADDRESS_CHAINED;
/* DISABLE_PADDING sometimes gets lost somehow, hands off... */
sc->ether.tx_ring[current_write].tdes1 |=
SBE_2T3E3_TX_DESC_DISABLE_PADDING | skb2->len;
if (current_write == sc->ether.tx_ring_current_write) {
sc->ether.tx_ring[current_write].tdes1 |=
SBE_2T3E3_TX_DESC_FIRST_SEGMENT;
} else {
sc->ether.tx_ring[current_write].tdes0 =
SBE_2T3E3_TX_DESC_21143_OWN;
}
sc->ether.tx_ring[current_write].tdes2 = virt_to_phys(skb2->data);
sc->ether.tx_data[current_write] = NULL;
last_write = current_write;
current_write = (current_write + 1) % SBE_2T3E3_TX_DESC_RING_SIZE;
}
}
sc->ether.tx_data[last_write] = skb;
sc->ether.tx_ring[last_write].tdes1 |=
SBE_2T3E3_TX_DESC_LAST_SEGMENT |
SBE_2T3E3_TX_DESC_INTERRUPT_ON_COMPLETION;
sc->ether.tx_ring[sc->ether.tx_ring_current_write].tdes0 |=
SBE_2T3E3_TX_DESC_21143_OWN;
sc->ether.tx_ring_current_write = current_write;
dev_dbg(&sc->pdev->dev, "txput: tdes0 = %08X tdes1 = %08X\n",
sc->ether.tx_ring[last_write].tdes0,
sc->ether.tx_ring[last_write].tdes1);
dc_write(sc->addr, SBE_2T3E3_21143_REG_TRANSMIT_POLL_DEMAND,
0xffffffff);
spin_unlock_irqrestore(&sc->ether.tx_lock, flags);
return 0;
}
void t3e3_read_card_serial_number(struct channel *sc)
{
u32 i;
for (i = 0; i < 3; i++)
sc->ether.card_serial_number[i] = t3e3_eeprom_read_word(sc, 10 + i);
netdev_info(sc->dev, "SBE wanPMC-2T3E3 serial number: %04X%04X%04X\n",
sc->ether.card_serial_number[0],
sc->ether.card_serial_number[1],
sc->ether.card_serial_number[2]);
}
/*
bit 0 led1 (green)
bit 1 led1 (yellow)
bit 2 led2 (green)
bit 3 led2 (yellow)
bit 4 led3 (green)
bit 5 led3 (yellow)
bit 6 led4 (green)
bit 7 led4 (yellow)
*/
void update_led(struct channel *sc, int blinker)
{
int leds;
if (sc->s.LOS)
leds = 0; /* led1 = off */
else if (sc->s.OOF)
leds = 2; /* led1 = yellow */
else if ((blinker & 1) && sc->rcv_count) {
leds = 0; /* led1 = off */
sc->rcv_count = 0;
} else
leds = 1; /* led1 = green */
cpld_write(sc, SBE_2T3E3_CPLD_REG_LEDR, leds);
sc->leds = leds;
}
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