// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * FarSync WAN driver for Linux (2.6.x kernel version)
+/* FarSync WAN driver for Linux (2.6.x kernel version)
*
* Actually sync driver for X.21, V.35 and V.24 on FarSync T-series cards
*
#include "farsync.h"
-/*
- * Module info
+/* Module info
*/
MODULE_AUTHOR("R.J.Dunlop <bob.dunlop@farsite.co.uk>");
MODULE_DESCRIPTION("FarSync T-Series WAN driver. FarSite Communications Ltd.");
/* Default parameters for the link
*/
#define FST_TX_QUEUE_LEN 100 /* At 8Mbps a longer queue length is
- * useful */
+ * useful
+ */
#define FST_TXQ_DEPTH 16 /* This one is for the buffering
* of frames on the way down to the card
* so that we can keep the card busy
* and maximise throughput
*/
#define FST_HIGH_WATER_MARK 12 /* Point at which we flow control
- * network layer */
+ * network layer
+ */
#define FST_LOW_WATER_MARK 8 /* Point at which we remove flow
- * control from network layer */
+ * control from network layer
+ */
#define FST_MAX_MTU 8000 /* Huge but possible */
#define FST_DEF_MTU 1500 /* Common sane value */
#define ARPHRD_MYTYPE ARPHRD_HDLC /* Cisco-HDLC (keepalives etc) */
#endif
-/*
- * Modules parameters and associated variables
+/* Modules parameters and associated variables
*/
static int fst_txq_low = FST_LOW_WATER_MARK;
static int fst_txq_high = FST_HIGH_WATER_MARK;
#define FST_MEMSIZE 0x100000 /* Size of card memory (1Mb) */
#define SMC_BASE 0x00002000L /* Base offset of the shared memory window main
- * configuration structure */
+ * configuration structure
+ */
#define BFM_BASE 0x00010000L /* Base offset of the shared memory window DMA
- * buffers */
+ * buffers
+ */
#define LEN_TX_BUFFER 8192 /* Size of packet buffers */
#define LEN_RX_BUFFER 8192
#define INTCSR_9054 0x68 /* Interrupt control/status register */
/* 9054 DMA Registers */
-/*
- * Note that we will be using DMA Channel 0 for copying rx data
+/* Note that we will be using DMA Channel 0 for copying rx data
* and Channel 1 for copying tx data
*/
#define DMAMODE0 0x80
int txpos; /* Next Tx buffer to use */
int txipos; /* Next Tx buffer to check for free */
int start; /* Indication of start/stop to network */
- /*
- * A sixteen entry transmit queue
+ /* A sixteen entry transmit queue
*/
int txqs; /* index to get next buffer to tx */
int txqe; /* index to queue next packet */
#define dev_to_port(D) (dev_to_hdlc(D)->priv)
#define port_to_dev(P) ((P)->dev)
-/*
- * Shared memory window access macros
+/* Shared memory window access macros
*
* We have a nice memory based structure above, which could be directly
* mapped on i386 but might not work on other architectures unless we use
#define FST_WRW(C,E,W) writew ((W), (C)->mem + WIN_OFFSET(E))
#define FST_WRL(C,E,L) writel ((L), (C)->mem + WIN_OFFSET(E))
-/*
- * Debug support
+/* Debug support
*/
#if FST_DEBUG
} while (0)
#endif
-/*
- * PCI ID lookup table
+/* PCI ID lookup table
*/
static const struct pci_device_id fst_pci_dev_id[] = {
{PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2P, PCI_ANY_ID,
MODULE_DEVICE_TABLE(pci, fst_pci_dev_id);
-/*
- * Device Driver Work Queues
+/* Device Driver Work Queues
*
* So that we don't spend too much time processing events in the
* Interrupt Service routine, we will declare a work queue per Card
unsigned long flags;
u64 mask;
- /*
- * Grab the queue exclusively
+ /* Grab the queue exclusively
*/
spin_lock_irqsave(&fst_work_q_lock, flags);
- /*
- * Making an entry in the queue is simply a matter of setting
+ /* Making an entry in the queue is simply a matter of setting
* a bit for the card indicating that there is work to do in the
* bottom half for the card. Note the limitation of 64 cards.
* That ought to be enough
u64 work_txq;
int i;
- /*
- * Grab the queue exclusively
+ /* Grab the queue exclusively
*/
dbg(DBG_TX, "fst_process_tx_work_q\n");
spin_lock_irqsave(&fst_work_q_lock, flags);
fst_work_txq = 0;
spin_unlock_irqrestore(&fst_work_q_lock, flags);
- /*
- * Call the bottom half for each card with work waiting
+ /* Call the bottom half for each card with work waiting
*/
for (i = 0; i < FST_MAX_CARDS; i++) {
if (work_txq & 0x01) {
u64 work_intq;
int i;
- /*
- * Grab the queue exclusively
+ /* Grab the queue exclusively
*/
dbg(DBG_INTR, "fst_process_int_work_q\n");
spin_lock_irqsave(&fst_work_q_lock, flags);
fst_work_intq = 0;
spin_unlock_irqrestore(&fst_work_q_lock, flags);
- /*
- * Call the bottom half for each card with work waiting
+ /* Call the bottom half for each card with work waiting
*/
for (i = 0; i < FST_MAX_CARDS; i++) {
if (work_intq & 0x01) {
dbg(DBG_ASS,
"Error in reading interrupt line register\n");
}
- /*
- * Assert PLX software reset and Am186 hardware reset
+ /* Assert PLX software reset and Am186 hardware reset
* and then deassert the PLX software reset but 186 still in reset
*/
outw(0x440f, card->pci_conf + CNTRL_9054 + 2);
outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
- /*
- * We are delaying here to allow the 9054 to reset itself
+ /* We are delaying here to allow the 9054 to reset itself
*/
usleep_range(10, 20);
outw(0x240f, card->pci_conf + CNTRL_9054 + 2);
- /*
- * We are delaying here to allow the 9054 to reload its eeprom
+ /* We are delaying here to allow the 9054 to reload its eeprom
*/
usleep_range(10, 20);
outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
fst_cpurelease(struct fst_card_info *card)
{
if (card->family == FST_FAMILY_TXU) {
- /*
- * Force posted writes to complete
+ /* Force posted writes to complete
*/
(void) readb(card->mem);
- /*
- * Release LRESET DO = 1
+ /* Release LRESET DO = 1
* Then release Local Hold, DO = 1
*/
outw(0x040e, card->pci_conf + CNTRL_9054 + 2);
switch (rx_status) {
case NET_RX_SUCCESS:
{
- /*
- * Nothing to do here
+ /* Nothing to do here
*/
break;
}
static inline void
fst_init_dma(struct fst_card_info *card)
{
- /*
- * This is only required for the PLX 9054
+ /* This is only required for the PLX 9054
*/
if (card->family == FST_FAMILY_TXU) {
pci_set_master(card->device);
{
struct net_device *dev = port_to_dev(port);
- /*
- * Everything is now set, just tell the card to go
+ /* Everything is now set, just tell the card to go
*/
dbg(DBG_TX, "fst_tx_dma_complete\n");
FST_WRB(card, txDescrRing[port->index][txpos].bits,
netif_trans_update(dev);
}
-/*
- * Mark it for our own raw sockets interface
+/* Mark it for our own raw sockets interface
*/
static __be16 farsync_type_trans(struct sk_buff *skb, struct net_device *dev)
{
dev->stats.rx_dropped++;
}
-/*
- * Receive a frame through the DMA
+/* Receive a frame through the DMA
*/
static inline void
fst_rx_dma(struct fst_card_info *card, dma_addr_t dma, u32 mem, int len)
{
- /*
- * This routine will setup the DMA and start it
+ /* This routine will setup the DMA and start it
*/
dbg(DBG_RX, "In fst_rx_dma %x %x %d\n", (u32)dma, mem, len);
outl(len, card->pci_conf + DMASIZ0); /* for this length */
outl(0x00000000c, card->pci_conf + DMADPR0); /* In this direction */
- /*
- * We use the dmarx_in_progress flag to flag the channel as busy
+ /* We use the dmarx_in_progress flag to flag the channel as busy
*/
card->dmarx_in_progress = 1;
outb(0x03, card->pci_conf + DMACSR0); /* Start the transfer */
}
-/*
- * Send a frame through the DMA
+/* Send a frame through the DMA
*/
static inline void
fst_tx_dma(struct fst_card_info *card, dma_addr_t dma, u32 mem, int len)
{
- /*
- * This routine will setup the DMA and start it.
+ /* This routine will setup the DMA and start it.
*/
dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)dma, mem, len);
outl(len, card->pci_conf + DMASIZ1); /* for this length */
outl(0x000000004, card->pci_conf + DMADPR1); /* In this direction */
- /*
- * We use the dmatx_in_progress to flag the channel as busy
+ /* We use the dmatx_in_progress to flag the channel as busy
*/
card->dmatx_in_progress = 1;
outb(0x03, card->pci_conf + DMACSR1); /* Start the transfer */
fst_issue_cmd(port, SETV24O);
}
-/*
- * Setup port Rx buffers
+/* Setup port Rx buffers
*/
static void
fst_rx_config(struct fst_port_info *port)
spin_unlock_irqrestore(&card->card_lock, flags);
}
-/*
- * Setup port Tx buffers
+/* Setup port Tx buffers
*/
static void
fst_tx_config(struct fst_port_info *port)
ais = FST_RDB(card, suStatus.alarmIndicationSignal);
if (los) {
- /*
- * Lost the link
+ /* Lost the link
*/
if (netif_carrier_ok(port_to_dev(port))) {
dbg(DBG_INTR, "Net carrier off\n");
netif_carrier_off(port_to_dev(port));
}
} else {
- /*
- * Link available
+ /* Link available
*/
if (!netif_carrier_ok(port_to_dev(port))) {
dbg(DBG_INTR, "Net carrier on\n");
{
struct net_device *dev = port_to_dev(port);
- /*
- * Increment the appropriate error counter
+ /* Increment the appropriate error counter
*/
dev->stats.rx_errors++;
if (dmabits & RX_OFLO) {
int pi;
pi = port->index;
- /*
- * Discard buffer descriptors until we see the start of the
+ /* Discard buffer descriptors until we see the start of the
* next frame. Note that for long frames this could be in
* a subsequent interrupt.
*/
/* Discard the CRC */
len -= 2;
if (len == 0) {
- /*
- * This seems to happen on the TE1 interface sometimes
+ /* This seems to happen on the TE1 interface sometimes
* so throw the frame away and log the event.
*/
pr_err("Frame received with 0 length. Card %d Port %d\n",
return;
}
- /*
- * We know the length we need to receive, len.
+ /* We know the length we need to receive, len.
* It's not worth using the DMA for reads of less than
* FST_MIN_DMA_LEN
*/
port->rxpos = rxp;
}
-/*
- * The bottom halfs to the ISR
+/* The bottom half to the ISR
*
*/
unsigned long flags;
struct net_device *dev;
- /*
- * Find a free buffer for the transmit
+ /* Find a free buffer for the transmit
* Step through each port on this card
*/
while (!(FST_RDB(card, txDescrRing[pi][port->txpos].bits) &
DMA_OWN) &&
!(card->dmatx_in_progress)) {
- /*
- * There doesn't seem to be a txdone event per-se
+ /* There doesn't seem to be a txdone event per-se
* We seem to have to deduce it, by checking the DMA_OWN
* bit on the next buffer we think we can use
*/
spin_lock_irqsave(&card->card_lock, flags);
txq_length = port->txqe - port->txqs;
if (txq_length < 0) {
- /*
- * This is the case where one has wrapped and the
+ /* This is the case where one has wrapped and the
* maths gives us a negative number
*/
txq_length = txq_length + FST_TXQ_DEPTH;
}
spin_unlock_irqrestore(&card->card_lock, flags);
if (txq_length > 0) {
- /*
- * There is something to send
+ /* There is something to send
*/
spin_lock_irqsave(&card->card_lock, flags);
skb = port->txq[port->txqs];
port->txqs = 0;
}
spin_unlock_irqrestore(&card->card_lock, flags);
- /*
- * copy the data and set the required indicators on the
+ /* copy the data and set the required indicators on the
* card.
*/
FST_WRW(card, txDescrRing[pi][port->txpos].bcnt,
}
if (++port->txpos >= NUM_TX_BUFFER)
port->txpos = 0;
- /*
- * If we have flow control on, can we now release it?
+ /* If we have flow control on, can we now release it?
*/
if (port->start) {
if (txq_length < fst_txq_low) {
}
dev_kfree_skb(skb);
} else {
- /*
- * Nothing to send so break out of the while loop
+ /* Nothing to send so break out of the while loop
*/
break;
}
while (!(FST_RDB(card, rxDescrRing[pi][port->rxpos].bits)
& DMA_OWN) && !(card->dmarx_in_progress)) {
if (rx_count > fst_max_reads) {
- /*
- * Don't spend forever in receive processing
+ /* Don't spend forever in receive processing
* Schedule another event
*/
fst_q_work_item(&fst_work_intq, card->card_no);
}
}
-/*
- * The interrupt service routine
+/* The interrupt service routine
* Dev_id is our fst_card_info pointer
*/
static irqreturn_t
unsigned int do_card_interrupt;
unsigned int int_retry_count;
- /*
- * Check to see if the interrupt was for this card
+ /* Check to see if the interrupt was for this card
* return if not
* Note that the call to clear the interrupt is important
*/
pr_err("Interrupt received for card %d in a non running state (%d)\n",
card->card_no, card->state);
- /*
- * It is possible to really be running, i.e. we have re-loaded
+ /* It is possible to really be running, i.e. we have re-loaded
* a running card
* Clear and reprime the interrupt source
*/
/* Clear and reprime the interrupt source */
fst_clear_intr(card);
- /*
- * Is the interrupt for this card (handshake == 1)
+ /* Is the interrupt for this card (handshake == 1)
*/
do_card_interrupt = 0;
if (FST_RDB(card, interruptHandshake) == 1) {
FST_WRB(card, interruptHandshake, 0xEE);
}
if (card->family == FST_FAMILY_TXU) {
- /*
- * Is it a DMA Interrupt
+ /* Is it a DMA Interrupt
*/
dma_intcsr = inl(card->pci_conf + INTCSR_9054);
if (dma_intcsr & 0x00200000) {
- /*
- * DMA Channel 0 (Rx transfer complete)
+ /* DMA Channel 0 (Rx transfer complete)
*/
dbg(DBG_RX, "DMA Rx xfer complete\n");
outb(0x8, card->pci_conf + DMACSR0);
do_card_interrupt += FST_RX_DMA_INT;
}
if (dma_intcsr & 0x00400000) {
- /*
- * DMA Channel 1 (Tx transfer complete)
+ /* DMA Channel 1 (Tx transfer complete)
*/
dbg(DBG_TX, "DMA Tx xfer complete\n");
outb(0x8, card->pci_conf + DMACSR1);
}
}
- /*
- * Have we been missing Interrupts
+ /* Have we been missing Interrupts
*/
int_retry_count = FST_RDL(card, interruptRetryCount);
if (int_retry_count) {
info->cardMode = FST_RDW(card, cardMode);
info->smcFirmwareVersion = FST_RDL(card, smcFirmwareVersion);
- /*
- * The T2U can report cable presence for both A or B
+ /* The T2U can report cable presence for both A or B
* in bits 0 and 1 of cableStatus. See which port we are and
* do the mapping.
*/
if (card->family == FST_FAMILY_TXU) {
if (port->index == 0) {
- /*
- * Port A
+ /* Port A
*/
info->cableStatus = info->cableStatus & 1;
} else {
- /*
- * Port B
+ /* Port B
*/
info->cableStatus = info->cableStatus >> 1;
info->cableStatus = info->cableStatus & 1;
}
}
- /*
- * Some additional bits if we are TE1
+ /* Some additional bits if we are TE1
*/
if (card->type == FST_TYPE_TE1) {
info->lineSpeed = FST_RDL(card, suConfig.dataRate);
return 0;
case FSTSETCONF:
-
- /*
- * Most of the settings have been moved to the generic ioctls
+ /* Most of the settings have been moved to the generic ioctls
* this just covers debug and board ident now
*/
static int
fst_attach(struct net_device *dev, unsigned short encoding, unsigned short parity)
{
- /*
- * Setting currently fixed in FarSync card so we check and forget
+ /* Setting currently fixed in FarSync card so we check and forget
*/
if (encoding != ENCODING_NRZ || parity != PARITY_CRC16_PR1_CCITT)
return -EINVAL;
return NETDEV_TX_OK;
}
- /*
- * We are always going to queue the packet
+ /* We are always going to queue the packet
* so that the bottom half is the only place we tx from
* Check there is room in the port txq
*/
spin_lock_irqsave(&card->card_lock, flags);
txq_length = port->txqe - port->txqs;
if (txq_length < 0) {
- /*
- * This is the case where the next free has wrapped but the
+ /* This is the case where the next free has wrapped but the
* last used hasn't
*/
txq_length = txq_length + FST_TXQ_DEPTH;
}
spin_unlock_irqrestore(&card->card_lock, flags);
if (txq_length > fst_txq_high) {
- /*
- * We have got enough buffers in the pipeline. Ask the network
+ /* We have got enough buffers in the pipeline. Ask the network
* layer to stop sending frames down
*/
netif_stop_queue(dev);
}
if (txq_length == FST_TXQ_DEPTH - 1) {
- /*
- * This shouldn't have happened but such is life
+ /* This shouldn't have happened but such is life
*/
dev_kfree_skb(skb);
dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
- /*
- * queue the buffer
+ /* queue the buffer
*/
spin_lock_irqsave(&card->card_lock, flags);
port->txq[port->txqe] = skb;
return NETDEV_TX_OK;
}
-/*
- * Card setup having checked hardware resources.
+/* Card setup having checked hardware resources.
* Should be pretty bizarre if we get an error here (kernel memory
* exhaustion is one possibility). If we do see a problem we report it
* via a printk and leave the corresponding interface and all that follow
.ndo_tx_timeout = fst_tx_timeout,
};
-/*
- * Initialise card when detected.
+/* Initialise card when detected.
* Returns 0 to indicate success, or errno otherwise.
*/
static int
#if FST_DEBUG
dbg(DBG_ASS, "The value of debug mask is %x\n", fst_debug_mask);
#endif
- /*
- * We are going to be clever and allow certain cards not to be
+ /* We are going to be clever and allow certain cards not to be
* configured. An exclude list can be provided in /etc/modules.conf
*/
if (fst_excluded_cards != 0) {
- /*
- * There are cards to exclude
+ /* There are cards to exclude
*
*/
for (i = 0; i < fst_excluded_cards; i++) {
if (err)
goto init_card_fail;
if (card->family == FST_FAMILY_TXU) {
- /*
- * Allocate a dma buffer for transmit and receives
+ /* Allocate a dma buffer for transmit and receives
*/
card->rx_dma_handle_host =
dma_alloc_coherent(&card->device->dev, FST_MAX_MTU,
return err;
}
-/*
- * Cleanup and close down a card
+/* Cleanup and close down a card
*/
static void
fst_remove_one(struct pci_dev *pdev)
iounmap(card->mem);
pci_release_regions(pdev);
if (card->family == FST_FAMILY_TXU) {
- /*
- * Free dma buffers
+ /* Free dma buffers
*/
dma_free_coherent(&card->device->dev, FST_MAX_MTU,
card->rx_dma_handle_host,
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