diff options
Diffstat (limited to 'drivers/net/wan/farsync.c')
| -rw-r--r-- | drivers/net/wan/farsync.c | 2712 |
1 files changed, 2712 insertions, 0 deletions
diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c new file mode 100644 index 000000000000..7575b799ce53 --- /dev/null +++ b/drivers/net/wan/farsync.c @@ -0,0 +1,2712 @@ +/* + * 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 + * + * Copyright (C) 2001-2004 FarSite Communications Ltd. + * www.farsite.co.uk + * + * 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. + * + * Author: R.J.Dunlop <bob.dunlop@farsite.co.uk> + * Maintainer: Kevin Curtis <kevin.curtis@farsite.co.uk> + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/version.h> +#include <linux/pci.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/if.h> +#include <linux/hdlc.h> +#include <asm/io.h> +#include <asm/uaccess.h> + +#include "farsync.h" + +/* + * Module info + */ +MODULE_AUTHOR("R.J.Dunlop <bob.dunlop@farsite.co.uk>"); +MODULE_DESCRIPTION("FarSync T-Series WAN driver. FarSite Communications Ltd."); +MODULE_LICENSE("GPL"); + +/* Driver configuration and global parameters + * ========================================== + */ + +/* Number of ports (per card) and cards supported + */ +#define FST_MAX_PORTS 4 +#define FST_MAX_CARDS 32 + +/* Default parameters for the link + */ +#define FST_TX_QUEUE_LEN 100 /* At 8Mbps a longer queue length is + * useful, the syncppp module forces + * this down assuming a slower line I + * guess. + */ +#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 */ +#define FST_LOW_WATER_MARK 8 /* Point at which we remove flow + * control from network layer */ +#define FST_MAX_MTU 8000 /* Huge but possible */ +#define FST_DEF_MTU 1500 /* Common sane value */ + +#define FST_TX_TIMEOUT (2*HZ) + +#ifdef ARPHRD_RAWHDLC +#define ARPHRD_MYTYPE ARPHRD_RAWHDLC /* Raw frames */ +#else +#define ARPHRD_MYTYPE ARPHRD_HDLC /* Cisco-HDLC (keepalives etc) */ +#endif + +/* + * Modules parameters and associated varaibles + */ +int fst_txq_low = FST_LOW_WATER_MARK; +int fst_txq_high = FST_HIGH_WATER_MARK; +int fst_max_reads = 7; +int fst_excluded_cards = 0; +int fst_excluded_list[FST_MAX_CARDS]; + +module_param(fst_txq_low, int, 0); +module_param(fst_txq_high, int, 0); +module_param(fst_max_reads, int, 0); +module_param(fst_excluded_cards, int, 0); +module_param_array(fst_excluded_list, int, NULL, 0); + +/* Card shared memory layout + * ========================= + */ +#pragma pack(1) + +/* This information is derived in part from the FarSite FarSync Smc.h + * file. Unfortunately various name clashes and the non-portability of the + * bit field declarations in that file have meant that I have chosen to + * recreate the information here. + * + * The SMC (Shared Memory Configuration) has a version number that is + * incremented every time there is a significant change. This number can + * be used to check that we have not got out of step with the firmware + * contained in the .CDE files. + */ +#define SMC_VERSION 24 + +#define FST_MEMSIZE 0x100000 /* Size of card memory (1Mb) */ + +#define SMC_BASE 0x00002000L /* Base offset of the shared memory window main + * configuration structure */ +#define BFM_BASE 0x00010000L /* Base offset of the shared memory window DMA + * buffers */ + +#define LEN_TX_BUFFER 8192 /* Size of packet buffers */ +#define LEN_RX_BUFFER 8192 + +#define LEN_SMALL_TX_BUFFER 256 /* Size of obsolete buffs used for DOS diags */ +#define LEN_SMALL_RX_BUFFER 256 + +#define NUM_TX_BUFFER 2 /* Must be power of 2. Fixed by firmware */ +#define NUM_RX_BUFFER 8 + +/* Interrupt retry time in milliseconds */ +#define INT_RETRY_TIME 2 + +/* The Am186CH/CC processors support a SmartDMA mode using circular pools + * of buffer descriptors. The structure is almost identical to that used + * in the LANCE Ethernet controllers. Details available as PDF from the + * AMD web site: http://www.amd.com/products/epd/processors/\ + * 2.16bitcont/3.am186cxfa/a21914/21914.pdf + */ +struct txdesc { /* Transmit descriptor */ + volatile u16 ladr; /* Low order address of packet. This is a + * linear address in the Am186 memory space + */ + volatile u8 hadr; /* High order address. Low 4 bits only, high 4 + * bits must be zero + */ + volatile u8 bits; /* Status and config */ + volatile u16 bcnt; /* 2s complement of packet size in low 15 bits. + * Transmit terminal count interrupt enable in + * top bit. + */ + u16 unused; /* Not used in Tx */ +}; + +struct rxdesc { /* Receive descriptor */ + volatile u16 ladr; /* Low order address of packet */ + volatile u8 hadr; /* High order address */ + volatile u8 bits; /* Status and config */ + volatile u16 bcnt; /* 2s complement of buffer size in low 15 bits. + * Receive terminal count interrupt enable in + * top bit. + */ + volatile u16 mcnt; /* Message byte count (15 bits) */ +}; + +/* Convert a length into the 15 bit 2's complement */ +/* #define cnv_bcnt(len) (( ~(len) + 1 ) & 0x7FFF ) */ +/* Since we need to set the high bit to enable the completion interrupt this + * can be made a lot simpler + */ +#define cnv_bcnt(len) (-(len)) + +/* Status and config bits for the above */ +#define DMA_OWN 0x80 /* SmartDMA owns the descriptor */ +#define TX_STP 0x02 /* Tx: start of packet */ +#define TX_ENP 0x01 /* Tx: end of packet */ +#define RX_ERR 0x40 /* Rx: error (OR of next 4 bits) */ +#define RX_FRAM 0x20 /* Rx: framing error */ +#define RX_OFLO 0x10 /* Rx: overflow error */ +#define RX_CRC 0x08 /* Rx: CRC error */ +#define RX_HBUF 0x04 /* Rx: buffer error */ +#define RX_STP 0x02 /* Rx: start of packet */ +#define RX_ENP 0x01 /* Rx: end of packet */ + +/* Interrupts from the card are caused by various events which are presented + * in a circular buffer as several events may be processed on one physical int + */ +#define MAX_CIRBUFF 32 + +struct cirbuff { + u8 rdindex; /* read, then increment and wrap */ + u8 wrindex; /* write, then increment and wrap */ + u8 evntbuff[MAX_CIRBUFF]; +}; + +/* Interrupt event codes. + * Where appropriate the two low order bits indicate the port number + */ +#define CTLA_CHG 0x18 /* Control signal changed */ +#define CTLB_CHG 0x19 +#define CTLC_CHG 0x1A +#define CTLD_CHG 0x1B + +#define INIT_CPLT 0x20 /* Initialisation complete */ +#define INIT_FAIL 0x21 /* Initialisation failed */ + +#define ABTA_SENT 0x24 /* Abort sent */ +#define ABTB_SENT 0x25 +#define ABTC_SENT 0x26 +#define ABTD_SENT 0x27 + +#define TXA_UNDF 0x28 /* Transmission underflow */ +#define TXB_UNDF 0x29 +#define TXC_UNDF 0x2A +#define TXD_UNDF 0x2B + +#define F56_INT 0x2C +#define M32_INT 0x2D + +#define TE1_ALMA 0x30 + +/* Port physical configuration. See farsync.h for field values */ +struct port_cfg { + u16 lineInterface; /* Physical interface type */ + u8 x25op; /* Unused at present */ + u8 internalClock; /* 1 => internal clock, 0 => external */ + u8 transparentMode; /* 1 => on, 0 => off */ + u8 invertClock; /* 0 => normal, 1 => inverted */ + u8 padBytes[6]; /* Padding */ + u32 lineSpeed; /* Speed in bps */ +}; + +/* TE1 port physical configuration */ +struct su_config { + u32 dataRate; + u8 clocking; + u8 framing; + u8 structure; + u8 interface; + u8 coding; + u8 lineBuildOut; + u8 equalizer; + u8 transparentMode; + u8 loopMode; + u8 range; + u8 txBufferMode; + u8 rxBufferMode; + u8 startingSlot; + u8 losThreshold; + u8 enableIdleCode; + u8 idleCode; + u8 spare[44]; +}; + +/* TE1 Status */ +struct su_status { + u32 receiveBufferDelay; + u32 framingErrorCount; + u32 codeViolationCount; + u32 crcErrorCount; + u32 lineAttenuation; + u8 portStarted; + u8 lossOfSignal; + u8 receiveRemoteAlarm; + u8 alarmIndicationSignal; + u8 spare[40]; +}; + +/* Finally sling all the above together into the shared memory structure. + * Sorry it's a hodge podge of arrays, structures and unused bits, it's been + * evolving under NT for some time so I guess we're stuck with it. + * The structure starts at offset SMC_BASE. + * See farsync.h for some field values. + */ +struct fst_shared { + /* DMA descriptor rings */ + struct rxdesc rxDescrRing[FST_MAX_PORTS][NUM_RX_BUFFER]; + struct txdesc txDescrRing[FST_MAX_PORTS][NUM_TX_BUFFER]; + + /* Obsolete small buffers */ + u8 smallRxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_SMALL_RX_BUFFER]; + u8 smallTxBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_SMALL_TX_BUFFER]; + + u8 taskStatus; /* 0x00 => initialising, 0x01 => running, + * 0xFF => halted + */ + + u8 interruptHandshake; /* Set to 0x01 by adapter to signal interrupt, + * set to 0xEE by host to acknowledge interrupt + */ + + u16 smcVersion; /* Must match SMC_VERSION */ + + u32 smcFirmwareVersion; /* 0xIIVVRRBB where II = product ID, VV = major + * version, RR = revision and BB = build + */ + + u16 txa_done; /* Obsolete completion flags */ + u16 rxa_done; + u16 txb_done; + u16 rxb_done; + u16 txc_done; + u16 rxc_done; + u16 txd_done; + u16 rxd_done; + + u16 mailbox[4]; /* Diagnostics mailbox. Not used */ + + struct cirbuff interruptEvent; /* interrupt causes */ + + u32 v24IpSts[FST_MAX_PORTS]; /* V.24 control input status */ + u32 v24OpSts[FST_MAX_PORTS]; /* V.24 control output status */ + + struct port_cfg portConfig[FST_MAX_PORTS]; + + u16 clockStatus[FST_MAX_PORTS]; /* lsb: 0=> present, 1=> absent */ + + u16 cableStatus; /* lsb: 0=> present, 1=> absent */ + + u16 txDescrIndex[FST_MAX_PORTS]; /* transmit descriptor ring index */ + u16 rxDescrIndex[FST_MAX_PORTS]; /* receive descriptor ring index */ + + u16 portMailbox[FST_MAX_PORTS][2]; /* command, modifier */ + u16 cardMailbox[4]; /* Not used */ + + /* Number of times the card thinks the host has + * missed an interrupt by not acknowledging + * within 2mS (I guess NT has problems) + */ + u32 interruptRetryCount; + + /* Driver private data used as an ID. We'll not + * use this as I'd rather keep such things + * in main memory rather than on the PCI bus + */ + u32 portHandle[FST_MAX_PORTS]; + + /* Count of Tx underflows for stats */ + u32 transmitBufferUnderflow[FST_MAX_PORTS]; + + /* Debounced V.24 control input status */ + u32 v24DebouncedSts[FST_MAX_PORTS]; + + /* Adapter debounce timers. Don't touch */ + u32 ctsTimer[FST_MAX_PORTS]; + u32 ctsTimerRun[FST_MAX_PORTS]; + u32 dcdTimer[FST_MAX_PORTS]; + u32 dcdTimerRun[FST_MAX_PORTS]; + + u32 numberOfPorts; /* Number of ports detected at startup */ + + u16 _reserved[64]; + + u16 cardMode; /* Bit-mask to enable features: + * Bit 0: 1 enables LED identify mode + */ + + u16 portScheduleOffset; + + struct su_config suConfig; /* TE1 Bits */ + struct su_status suStatus; + + u32 endOfSmcSignature; /* endOfSmcSignature MUST be the last member of + * the structure and marks the end of shared + * memory. Adapter code initializes it as + * END_SIG. + */ +}; + +/* endOfSmcSignature value */ +#define END_SIG 0x12345678 + +/* Mailbox values. (portMailbox) */ +#define NOP 0 /* No operation */ +#define ACK 1 /* Positive acknowledgement to PC driver */ +#define NAK 2 /* Negative acknowledgement to PC driver */ +#define STARTPORT 3 /* Start an HDLC port */ +#define STOPPORT 4 /* Stop an HDLC port */ +#define ABORTTX 5 /* Abort the transmitter for a port */ +#define SETV24O 6 /* Set V24 outputs */ + +/* PLX Chip Register Offsets */ +#define CNTRL_9052 0x50 /* Control Register */ +#define CNTRL_9054 0x6c /* Control Register */ + +#define INTCSR_9052 0x4c /* Interrupt control/status register */ +#define INTCSR_9054 0x68 /* Interrupt control/status register */ + +/* 9054 DMA Registers */ +/* + * Note that we will be using DMA Channel 0 for copying rx data + * and Channel 1 for copying tx data + */ +#define DMAMODE0 0x80 +#define DMAPADR0 0x84 +#define DMALADR0 0x88 +#define DMASIZ0 0x8c +#define DMADPR0 0x90 +#define DMAMODE1 0x94 +#define DMAPADR1 0x98 +#define DMALADR1 0x9c +#define DMASIZ1 0xa0 +#define DMADPR1 0xa4 +#define DMACSR0 0xa8 +#define DMACSR1 0xa9 +#define DMAARB 0xac +#define DMATHR 0xb0 +#define DMADAC0 0xb4 +#define DMADAC1 0xb8 +#define DMAMARBR 0xac + +#define FST_MIN_DMA_LEN 64 +#define FST_RX_DMA_INT 0x01 +#define FST_TX_DMA_INT 0x02 +#define FST_CARD_INT 0x04 + +/* Larger buffers are positioned in memory at offset BFM_BASE */ +struct buf_window { + u8 txBuffer[FST_MAX_PORTS][NUM_TX_BUFFER][LEN_TX_BUFFER]; + u8 rxBuffer[FST_MAX_PORTS][NUM_RX_BUFFER][LEN_RX_BUFFER]; +}; + +/* Calculate offset of a buffer object within the shared memory window */ +#define BUF_OFFSET(X) (BFM_BASE + offsetof(struct buf_window, X)) + +#pragma pack() + +/* Device driver private information + * ================================= + */ +/* Per port (line or channel) information + */ +struct fst_port_info { + struct net_device *dev; /* Device struct - must be first */ + struct fst_card_info *card; /* Card we're associated with */ + int index; /* Port index on the card */ + int hwif; /* Line hardware (lineInterface copy) */ + int run; /* Port is running */ + int mode; /* Normal or FarSync raw */ + int rxpos; /* Next Rx buffer to use */ + 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 + */ + int txqs; /* index to get next buffer to tx */ + int txqe; /* index to queue next packet */ + struct sk_buff *txq[FST_TXQ_DEPTH]; /* The queue */ + int rxqdepth; +}; + +/* Per card information + */ +struct fst_card_info { + char __iomem *mem; /* Card memory mapped to kernel space */ + char __iomem *ctlmem; /* Control memory for PCI cards */ + unsigned int phys_mem; /* Physical memory window address */ + unsigned int phys_ctlmem; /* Physical control memory address */ + unsigned int irq; /* Interrupt request line number */ + unsigned int nports; /* Number of serial ports */ + unsigned int type; /* Type index of card */ + unsigned int state; /* State of card */ + spinlock_t card_lock; /* Lock for SMP access */ + unsigned short pci_conf; /* PCI card config in I/O space */ + /* Per port info */ + struct fst_port_info ports[FST_MAX_PORTS]; + struct pci_dev *device; /* Information about the pci device */ + int card_no; /* Inst of the card on the system */ + int family; /* TxP or TxU */ + int dmarx_in_progress; + int dmatx_in_progress; + unsigned long int_count; + unsigned long int_time_ave; + void *rx_dma_handle_host; + dma_addr_t rx_dma_handle_card; + void *tx_dma_handle_host; + dma_addr_t tx_dma_handle_card; + struct sk_buff *dma_skb_rx; + struct fst_port_info *dma_port_rx; + struct fst_port_info *dma_port_tx; + int dma_len_rx; + int dma_len_tx; + int dma_txpos; + int dma_rxpos; +}; + +/* Convert an HDLC device pointer into a port info pointer and similar */ +#define dev_to_port(D) (dev_to_hdlc(D)->priv) +#define port_to_dev(P) ((P)->dev) + + +/* + * 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 + * the readb,w,l and writeb,w,l macros. Unfortunately these macros take + * physical offsets so we have to convert. The only saving grace is that + * this should all collapse back to a simple indirection eventually. + */ +#define WIN_OFFSET(X) ((long)&(((struct fst_shared *)SMC_BASE)->X)) + +#define FST_RDB(C,E) readb ((C)->mem + WIN_OFFSET(E)) +#define FST_RDW(C,E) readw ((C)->mem + WIN_OFFSET(E)) +#define FST_RDL(C,E) readl ((C)->mem + WIN_OFFSET(E)) + +#define FST_WRB(C,E,B) writeb ((B), (C)->mem + WIN_OFFSET(E)) +#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 + */ +#if FST_DEBUG + +static int fst_debug_mask = { FST_DEBUG }; + +/* Most common debug activity is to print something if the corresponding bit + * is set in the debug mask. Note: this uses a non-ANSI extension in GCC to + * support variable numbers of macro parameters. The inverted if prevents us + * eating someone else's else clause. + */ +#define dbg(F,fmt,A...) if ( ! ( fst_debug_mask & (F))) \ + ; \ + else \ + printk ( KERN_DEBUG FST_NAME ": " fmt, ## A ) + +#else +#define dbg(X...) /* NOP */ +#endif + +/* Printing short cuts + */ +#define printk_err(fmt,A...) printk ( KERN_ERR FST_NAME ": " fmt, ## A ) +#define printk_warn(fmt,A...) printk ( KERN_WARNING FST_NAME ": " fmt, ## A ) +#define printk_info(fmt,A...) printk ( KERN_INFO FST_NAME ": " fmt, ## A ) + +/* + * PCI ID lookup table + */ +static struct pci_device_id fst_pci_dev_id[] __devinitdata = { + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2P, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_T2P}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4P, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_T4P}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T1U, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_T1U}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T2U, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_T2U}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_T4U, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_T4U}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_TE1}, + + {PCI_VENDOR_ID_FARSITE, PCI_DEVICE_ID_FARSITE_TE1C, PCI_ANY_ID, + PCI_ANY_ID, 0, 0, FST_TYPE_TE1}, + {0,} /* End */ +}; + +MODULE_DEVICE_TABLE(pci, fst_pci_dev_id); + +/* + * 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 + * and make the ISR schedule a task in the queue for later execution. + * In the 2.4 Kernel we used to use the immediate queue for BH's + * Now that they are gone, tasklets seem to be much better than work + * queues. + */ + +static void do_bottom_half_tx(struct fst_card_info *card); +static void do_bottom_half_rx(struct fst_card_info *card); +static void fst_process_tx_work_q(unsigned long work_q); +static void fst_process_int_work_q(unsigned long work_q); + +DECLARE_TASKLET(fst_tx_task, fst_process_tx_work_q, 0); +DECLARE_TASKLET(fst_int_task, fst_process_int_work_q, 0); + +struct fst_card_info *fst_card_array[FST_MAX_CARDS]; +spinlock_t fst_work_q_lock; +u64 fst_work_txq; +u64 fst_work_intq; + +static void +fst_q_work_item(u64 * queue, int card_index) +{ + unsigned long flags; + u64 mask; + + /* + * Grab the queue exclusively + */ + spin_lock_irqsave(&fst_work_q_lock, flags); + + /* + * 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 + */ + mask = 1 << card_index; + *queue |= mask; + spin_unlock_irqrestore(&fst_work_q_lock, flags); +} + +static void +fst_process_tx_work_q(unsigned long /*void **/work_q) +{ + unsigned long flags; + u64 work_txq; + int i; + + /* + * Grab the queue exclusively + */ + dbg(DBG_TX, "fst_process_tx_work_q\n"); + spin_lock_irqsave(&fst_work_q_lock, flags); + work_txq = fst_work_txq; + fst_work_txq = 0; + spin_unlock_irqrestore(&fst_work_q_lock, flags); + + /* + * Call the bottom half for each card with work waiting + */ + for (i = 0; i < FST_MAX_CARDS; i++) { + if (work_txq & 0x01) { + if (fst_card_array[i] != NULL) { + dbg(DBG_TX, "Calling tx bh for card %d\n", i); + do_bottom_half_tx(fst_card_array[i]); + } + } + work_txq = work_txq >> 1; + } +} + +static void +fst_process_int_work_q(unsigned long /*void **/work_q) +{ + unsigned long flags; + u64 work_intq; + int i; + + /* + * Grab the queue exclusively + */ + dbg(DBG_INTR, "fst_process_int_work_q\n"); + spin_lock_irqsave(&fst_work_q_lock, flags); + work_intq = fst_work_intq; + fst_work_intq = 0; + spin_unlock_irqrestore(&fst_work_q_lock, flags); + + /* + * Call the bottom half for each card with work waiting + */ + for (i = 0; i < FST_MAX_CARDS; i++) { + if (work_intq & 0x01) { + if (fst_card_array[i] != NULL) { + dbg(DBG_INTR, + "Calling rx & tx bh for card %d\n", i); + do_bottom_half_rx(fst_card_array[i]); + do_bottom_half_tx(fst_card_array[i]); + } + } + work_intq = work_intq >> 1; + } +} + +/* Card control functions + * ====================== + */ +/* Place the processor in reset state + * + * Used to be a simple write to card control space but a glitch in the latest + * AMD Am186CH processor means that we now have to do it by asserting and de- + * asserting the PLX chip PCI Adapter Software Reset. Bit 30 in CNTRL register + * at offset 9052_CNTRL. Note the updates for the TXU. + */ +static inline void +fst_cpureset(struct fst_card_info *card) +{ + unsigned char interrupt_line_register; + unsigned long j = jiffies + 1; + unsigned int regval; + + if (card->family == FST_FAMILY_TXU) { + if (pci_read_config_byte + (card->device, PCI_INTERRUPT_LINE, &interrupt_line_register)) { + dbg(DBG_ASS, + "Error in reading interrupt line register\n"); + } + /* + * 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 + */ + j = jiffies + 1; + while (jiffies < j) + /* Do nothing */ ; + outw(0x240f, card->pci_conf + CNTRL_9054 + 2); + /* + * We are delaying here to allow the 9054 to reload its eeprom + */ + j = jiffies + 1; + while (jiffies < j) + /* Do nothing */ ; + outw(0x040f, card->pci_conf + CNTRL_9054 + 2); + + if (pci_write_config_byte + (card->device, PCI_INTERRUPT_LINE, interrupt_line_register)) { + dbg(DBG_ASS, + "Error in writing interrupt line register\n"); + } + + } else { + regval = inl(card->pci_conf + CNTRL_9052); + + outl(regval | 0x40000000, card->pci_conf + CNTRL_9052); + outl(regval & ~0x40000000, card->pci_conf + CNTRL_9052); + } +} + +/* Release the processor from reset + */ +static inline void +fst_cpurelease(struct fst_card_info *card) +{ + if (card->family == FST_FAMILY_TXU) { + /* + * Force posted writes to complete + */ + (void) readb(card->mem); + + /* + * Release LRESET DO = 1 + * Then release Local Hold, DO = 1 + */ + outw(0x040e, card->pci_conf + CNTRL_9054 + 2); + outw(0x040f, card->pci_conf + CNTRL_9054 + 2); + } else { + (void) readb(card->ctlmem); + } +} + +/* Clear the cards interrupt flag + */ +static inline void +fst_clear_intr(struct fst_card_info *card) +{ + if (card->family == FST_FAMILY_TXU) { + (void) readb(card->ctlmem); + } else { + /* Poke the appropriate PLX chip register (same as enabling interrupts) + */ + outw(0x0543, card->pci_conf + INTCSR_9052); + } +} + +/* Enable card interrupts + */ +static inline void +fst_enable_intr(struct fst_card_info *card) +{ + if (card->family == FST_FAMILY_TXU) { + outl(0x0f0c0900, card->pci_conf + INTCSR_9054); + } else { + outw(0x0543, card->pci_conf + INTCSR_9052); + } +} + +/* Disable card interrupts + */ +static inline void +fst_disable_intr(struct fst_card_info *card) +{ + if (card->family == FST_FAMILY_TXU) { + outl(0x00000000, card->pci_conf + INTCSR_9054); + } else { + outw(0x0000, card->pci_conf + INTCSR_9052); + } +} + +/* Process the result of trying to pass a received frame up the stack + */ +static void +fst_process_rx_status(int rx_status, char *name) +{ + switch (rx_status) { + case NET_RX_SUCCESS: + { + /* + * Nothing to do here + */ + break; + } + + case NET_RX_CN_LOW: + { + dbg(DBG_ASS, "%s: Receive Low Congestion\n", name); + break; + } + + case NET_RX_CN_MOD: + { + dbg(DBG_ASS, "%s: Receive Moderate Congestion\n", name); + break; + } + + case NET_RX_CN_HIGH: + { + dbg(DBG_ASS, "%s: Receive High Congestion\n", name); + break; + } + + case NET_RX_DROP: + { + dbg(DBG_ASS, "%s: Received packet dropped\n", name); + break; + } + } +} + +/* Initilaise DMA for PLX 9054 + */ +static inline void +fst_init_dma(struct fst_card_info *card) +{ + /* + * This is only required for the PLX 9054 + */ + if (card->family == FST_FAMILY_TXU) { + pci_set_master(card->device); + outl(0x00020441, card->pci_conf + DMAMODE0); + outl(0x00020441, card->pci_conf + DMAMODE1); + outl(0x0, card->pci_conf + DMATHR); + } +} + +/* Tx dma complete interrupt + */ +static void +fst_tx_dma_complete(struct fst_card_info *card, struct fst_port_info *port, + int len, int txpos) +{ + struct net_device *dev = port_to_dev(port); + struct net_device_stats *stats = hdlc_stats(dev); + + /* + * 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, + DMA_OWN | TX_STP | TX_ENP); + stats->tx_packets++; + stats->tx_bytes += len; + dev->trans_start = jiffies; +} + +/* + * Mark it for our own raw sockets interface + */ +static unsigned short farsync_type_trans(struct sk_buff *skb, + struct net_device *dev) +{ + skb->dev = dev; + skb->mac.raw = skb->data; + skb->pkt_type = PACKET_HOST; + return htons(ETH_P_CUST); +} + +/* Rx dma complete interrupt + */ +static void +fst_rx_dma_complete(struct fst_card_info *card, struct fst_port_info *port, + int len, struct sk_buff *skb, int rxp) +{ + struct net_device *dev = port_to_dev(port); + struct net_device_stats *stats = hdlc_stats(dev); + int pi; + int rx_status; + + dbg(DBG_TX, "fst_rx_dma_complete\n"); + pi = port->index; + memcpy(skb_put(skb, len), card->rx_dma_handle_host, len); + + /* Reset buffer descriptor */ + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + + /* Update stats */ + stats->rx_packets++; + stats->rx_bytes += len; + + /* Push upstream */ + dbg(DBG_RX, "Pushing the frame up the stack\n"); + if (port->mode == FST_RAW) + skb->protocol = farsync_type_trans(skb, dev); + else + skb->protocol = hdlc_type_trans(skb, dev); + rx_status = netif_rx(skb); + fst_process_rx_status(rx_status, port_to_dev(port)->name); + if (rx_status == NET_RX_DROP) + stats->rx_dropped++; + dev->last_rx = jiffies; +} + +/* + * Receive a frame through the DMA + */ +static inline void +fst_rx_dma(struct fst_card_info *card, unsigned char *skb, + unsigned char *mem, int len) +{ + /* + * This routine will setup the DMA and start it + */ + + dbg(DBG_RX, "In fst_rx_dma %p %p %d\n", skb, mem, len); + if (card->dmarx_in_progress) { + dbg(DBG_ASS, "In fst_rx_dma while dma in progress\n"); + } + + outl((unsigned long) skb, card->pci_conf + DMAPADR0); /* Copy to here */ + outl((unsigned long) mem, card->pci_conf + DMALADR0); /* from here */ + 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 + */ + card->dmarx_in_progress = 1; + outb(0x03, card->pci_conf + DMACSR0); /* Start the transfer */ +} + +/* + * Send a frame through the DMA + */ +static inline void +fst_tx_dma(struct fst_card_info *card, unsigned char *skb, + unsigned char *mem, int len) +{ + /* + * This routine will setup the DMA and start it. + */ + + dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len); + if (card->dmatx_in_progress) { + dbg(DBG_ASS, "In fst_tx_dma while dma in progress\n"); + } + + outl((unsigned long) skb, card->pci_conf + DMAPADR1); /* Copy from here */ + outl((unsigned long) mem, card->pci_conf + DMALADR1); /* to here */ + 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 + */ + card->dmatx_in_progress = 1; + outb(0x03, card->pci_conf + DMACSR1); /* Start the transfer */ +} + +/* Issue a Mailbox command for a port. + * Note we issue them on a fire and forget basis, not expecting to see an + * error and not waiting for completion. + */ +static void +fst_issue_cmd(struct fst_port_info *port, unsigned short cmd) +{ + struct fst_card_info *card; + unsigned short mbval; + unsigned long flags; + int safety; + + card = port->card; + spin_lock_irqsave(&card->card_lock, flags); + mbval = FST_RDW(card, portMailbox[port->index][0]); + + safety = 0; + /* Wait for any previous command to complete */ + while (mbval > NAK) { + spin_unlock_irqrestore(&card->card_lock, flags); + schedule_timeout(1); + spin_lock_irqsave(&card->card_lock, flags); + + if (++safety > 2000) { + printk_err("Mailbox safety timeout\n"); + break; + } + + mbval = FST_RDW(card, portMailbox[port->index][0]); + } + if (safety > 0) { + dbg(DBG_CMD, "Mailbox clear after %d jiffies\n", safety); + } + if (mbval == NAK) { + dbg(DBG_CMD, "issue_cmd: previous command was NAK'd\n"); + } + + FST_WRW(card, portMailbox[port->index][0], cmd); + + if (cmd == ABORTTX || cmd == STARTPORT) { + port->txpos = 0; + port->txipos = 0; + port->start = 0; + } + + spin_unlock_irqrestore(&card->card_lock, flags); +} + +/* Port output signals control + */ +static inline void +fst_op_raise(struct fst_port_info *port, unsigned int outputs) +{ + outputs |= FST_RDL(port->card, v24OpSts[port->index]); + FST_WRL(port->card, v24OpSts[port->index], outputs); + + if (port->run) + fst_issue_cmd(port, SETV24O); +} + +static inline void +fst_op_lower(struct fst_port_info *port, unsigned int outputs) +{ + outputs = ~outputs & FST_RDL(port->card, v24OpSts[port->index]); + FST_WRL(port->card, v24OpSts[port->index], outputs); + + if (port->run) + fst_issue_cmd(port, SETV24O); +} + +/* + * Setup port Rx buffers + */ +static void +fst_rx_config(struct fst_port_info *port) +{ + int i; + int pi; + unsigned int offset; + unsigned long flags; + struct fst_card_info *card; + + pi = port->index; + card = port->card; + spin_lock_irqsave(&card->card_lock, flags); + for (i = 0; i < NUM_RX_BUFFER; i++) { + offset = BUF_OFFSET(rxBuffer[pi][i][0]); + + FST_WRW(card, rxDescrRing[pi][i].ladr, (u16) offset); + FST_WRB(card, rxDescrRing[pi][i].hadr, (u8) (offset >> 16)); + FST_WRW(card, rxDescrRing[pi][i].bcnt, cnv_bcnt(LEN_RX_BUFFER)); + FST_WRW(card, rxDescrRing[pi][i].mcnt, LEN_RX_BUFFER); + FST_WRB(card, rxDescrRing[pi][i].bits, DMA_OWN); + } + port->rxpos = 0; + spin_unlock_irqrestore(&card->card_lock, flags); +} + +/* + * Setup port Tx buffers + */ +static void +fst_tx_config(struct fst_port_info *port) +{ + int i; + int pi; + unsigned int offset; + unsigned long flags; + struct fst_card_info *card; + + pi = port->index; + card = port->card; + spin_lock_irqsave(&card->card_lock, flags); + for (i = 0; i < NUM_TX_BUFFER; i++) { + offset = BUF_OFFSET(txBuffer[pi][i][0]); + + FST_WRW(card, txDescrRing[pi][i].ladr, (u16) offset); + FST_WRB(card, txDescrRing[pi][i].hadr, (u8) (offset >> 16)); + FST_WRW(card, txDescrRing[pi][i].bcnt, 0); + FST_WRB(card, txDescrRing[pi][i].bits, 0); + } + port->txpos = 0; + port->txipos = 0; + port->start = 0; + spin_unlock_irqrestore(&card->card_lock, flags); +} + +/* TE1 Alarm change interrupt event + */ +static void +fst_intr_te1_alarm(struct fst_card_info *card, struct fst_port_info *port) +{ + u8 los; + u8 rra; + u8 ais; + + los = FST_RDB(card, suStatus.lossOfSignal); + rra = FST_RDB(card, suStatus.receiveRemoteAlarm); + ais = FST_RDB(card, suStatus.alarmIndicationSignal); + + if (los) { + /* + * 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 + */ + if (!netif_carrier_ok(port_to_dev(port))) { + dbg(DBG_INTR, "Net carrier on\n"); + netif_carrier_on(port_to_dev(port)); + } + } + + if (los) + dbg(DBG_INTR, "Assert LOS Alarm\n"); + else + dbg(DBG_INTR, "De-assert LOS Alarm\n"); + if (rra) + dbg(DBG_INTR, "Assert RRA Alarm\n"); + else + dbg(DBG_INTR, "De-assert RRA Alarm\n"); + + if (ais) + dbg(DBG_INTR, "Assert AIS Alarm\n"); + else + dbg(DBG_INTR, "De-assert AIS Alarm\n"); +} + +/* Control signal change interrupt event + */ +static void +fst_intr_ctlchg(struct fst_card_info *card, struct fst_port_info *port) +{ + int signals; + + signals = FST_RDL(card, v24DebouncedSts[port->index]); + + if (signals & (((port->hwif == X21) || (port->hwif == X21D)) + ? IPSTS_INDICATE : IPSTS_DCD)) { + if (!netif_carrier_ok(port_to_dev(port))) { + dbg(DBG_INTR, "DCD active\n"); + netif_carrier_on(port_to_dev(port)); + } + } else { + if (netif_carrier_ok(port_to_dev(port))) { + dbg(DBG_INTR, "DCD lost\n"); + netif_carrier_off(port_to_dev(port)); + } + } +} + +/* Log Rx Errors + */ +static void +fst_log_rx_error(struct fst_card_info *card, struct fst_port_info *port, + unsigned char dmabits, int rxp, unsigned short len) +{ + struct net_device *dev = port_to_dev(port); + struct net_device_stats *stats = hdlc_stats(dev); + + /* + * Increment the appropriate error counter + */ + stats->rx_errors++; + if (dmabits & RX_OFLO) { + stats->rx_fifo_errors++; + dbg(DBG_ASS, "Rx fifo error on card %d port %d buffer %d\n", + card->card_no, port->index, rxp); + } + if (dmabits & RX_CRC) { + stats->rx_crc_errors++; + dbg(DBG_ASS, "Rx crc error on card %d port %d\n", + card->card_no, port->index); + } + if (dmabits & RX_FRAM) { + stats->rx_frame_errors++; + dbg(DBG_ASS, "Rx frame error on card %d port %d\n", + card->card_no, port->index); + } + if (dmabits == (RX_STP | RX_ENP)) { + stats->rx_length_errors++; + dbg(DBG_ASS, "Rx length error (%d) on card %d port %d\n", + len, card->card_no, port->index); + } +} + +/* Rx Error Recovery + */ +static void +fst_recover_rx_error(struct fst_card_info *card, struct fst_port_info *port, + unsigned char dmabits, int rxp, unsigned short len) +{ + int i; + int pi; + + pi = port->index; + /* + * Discard buffer descriptors until we see the start of the + * next frame. Note that for long frames this could be in + * a subsequent interrupt. + */ + i = 0; + while ((dmabits & (DMA_OWN | RX_STP)) == 0) { + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + rxp = (rxp+1) % NUM_RX_BUFFER; + if (++i > NUM_RX_BUFFER) { + dbg(DBG_ASS, "intr_rx: Discarding more bufs" + " than we have\n"); + break; + } + dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits); + dbg(DBG_ASS, "DMA Bits of next buffer was %x\n", dmabits); + } + dbg(DBG_ASS, "There were %d subsequent buffers in error\n", i); + + /* Discard the terminal buffer */ + if (!(dmabits & DMA_OWN)) { + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + rxp = (rxp+1) % NUM_RX_BUFFER; + } + port->rxpos = rxp; + return; + +} + +/* Rx complete interrupt + */ +static void +fst_intr_rx(struct fst_card_info *card, struct fst_port_info *port) +{ + unsigned char dmabits; + int pi; + int rxp; + int rx_status; + unsigned short len; + struct sk_buff *skb; + struct net_device *dev = port_to_dev(port); + struct net_device_stats *stats = hdlc_stats(dev); + + /* Check we have a buffer to process */ + pi = port->index; + rxp = port->rxpos; + dmabits = FST_RDB(card, rxDescrRing[pi][rxp].bits); + if (dmabits & DMA_OWN) { + dbg(DBG_RX | DBG_INTR, "intr_rx: No buffer port %d pos %d\n", + pi, rxp); + return; + } + if (card->dmarx_in_progress) { + return; + } + + /* Get buffer length */ + len = FST_RDW(card, rxDescrRing[pi][rxp].mcnt); + /* Discard the CRC */ + len -= 2; + if (len == 0) { + /* + * This seems to happen on the TE1 interface sometimes + * so throw the frame away and log the event. + */ + printk_err("Frame received with 0 length. Card %d Port %d\n", + card->card_no, port->index); + /* Return descriptor to card */ + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + + rxp = (rxp+1) % NUM_RX_BUFFER; + port->rxpos = rxp; + return; + } + + /* Check buffer length and for other errors. We insist on one packet + * in one buffer. This simplifies things greatly and since we've + * allocated 8K it shouldn't be a real world limitation + */ + dbg(DBG_RX, "intr_rx: %d,%d: flags %x len %d\n", pi, rxp, dmabits, len); + if (dmabits != (RX_STP | RX_ENP) || len > LEN_RX_BUFFER - 2) { + fst_log_rx_error(card, port, dmabits, rxp, len); + fst_recover_rx_error(card, port, dmabits, rxp, len); + return; + } + + /* Allocate SKB */ + if ((skb = dev_alloc_skb(len)) == NULL) { + dbg(DBG_RX, "intr_rx: can't allocate buffer\n"); + + stats->rx_dropped++; + + /* Return descriptor to card */ + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + + rxp = (rxp+1) % NUM_RX_BUFFER; + port->rxpos = rxp; + return; + } + + /* + * 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 + */ + + if ((len < FST_MIN_DMA_LEN) || (card->family == FST_FAMILY_TXP)) { + memcpy_fromio(skb_put(skb, len), + card->mem + BUF_OFFSET(rxBuffer[pi][rxp][0]), + len); + + /* Reset buffer descriptor */ + FST_WRB(card, rxDescrRing[pi][rxp].bits, DMA_OWN); + + /* Update stats */ + stats->rx_packets++; + stats->rx_bytes += len; + + /* Push upstream */ + dbg(DBG_RX, "Pushing frame up the stack\n"); + if (port->mode == FST_RAW) + skb->protocol = farsync_type_trans(skb, dev); + else + skb->protocol = hdlc_type_trans(skb, dev); + rx_status = netif_rx(skb); + fst_process_rx_status(rx_status, port_to_dev(port)->name); + if (rx_status == NET_RX_DROP) { + stats->rx_dropped++; + } + dev->last_rx = jiffies; + } else { + card->dma_skb_rx = skb; + card->dma_port_rx = port; + card->dma_len_rx = len; + card->dma_rxpos = rxp; + fst_rx_dma(card, (char *) card->rx_dma_handle_card, + (char *) BUF_OFFSET(rxBuffer[pi][rxp][0]), len); + } + if (rxp != port->rxpos) { + dbg(DBG_ASS, "About to increment rxpos by more than 1\n"); + dbg(DBG_ASS, "rxp = %d rxpos = %d\n", rxp, port->rxpos); + } + rxp = (rxp+1) % NUM_RX_BUFFER; + port->rxpos = rxp; +} + +/* + * The bottom halfs to the ISR + * + */ + +static void +do_bottom_half_tx(struct fst_card_info *card) +{ + struct fst_port_info *port; + int pi; + int txq_length; + struct sk_buff *skb; + unsigned long flags; + struct net_device *dev; + struct net_device_stats *stats; + + /* + * Find a free buffer for the transmit + * Step through each port on this card + */ + + dbg(DBG_TX, "do_bottom_half_tx\n"); + for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) { + if (!port->run) + continue; + + dev = port_to_dev(port); + stats = hdlc_stats(dev); + 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 + * 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); + if ((txq_length = port->txqe - port->txqs) < 0) { + /* + * 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 + */ + spin_lock_irqsave(&card->card_lock, flags); + skb = port->txq[port->txqs]; + port->txqs++; + if (port->txqs == FST_TXQ_DEPTH) { + port->txqs = 0; + } + spin_unlock_irqrestore(&card->card_lock, flags); + /* + * copy the data and set the required indicators on the + * card. + */ + FST_WRW(card, txDescrRing[pi][port->txpos].bcnt, + cnv_bcnt(skb->len)); + if ((skb->len < FST_MIN_DMA_LEN) + || (card->family == FST_FAMILY_TXP)) { + /* Enqueue the packet with normal io */ + memcpy_toio(card->mem + + BUF_OFFSET(txBuffer[pi] + [port-> + txpos][0]), + skb->data, skb->len); + FST_WRB(card, + txDescrRing[pi][port->txpos]. + bits, + DMA_OWN | TX_STP | TX_ENP); + stats->tx_packets++; + stats->tx_bytes += skb->len; + dev->trans_start = jiffies; + } else { + /* Or do it through dma */ + memcpy(card->tx_dma_handle_host, + skb->data, skb->len); + card->dma_port_tx = port; + card->dma_len_tx = skb->len; + card->dma_txpos = port->txpos; + fst_tx_dma(card, + (char *) card-> + tx_dma_handle_card, + (char *) + BUF_OFFSET(txBuffer[pi] + [port->txpos][0]), + skb->len); + } + if (++port->txpos >= NUM_TX_BUFFER) + port->txpos = 0; + /* + * If we have flow control on, can we now release it? + */ + if (port->start) { + if (txq_length < fst_txq_low) { + netif_wake_queue(port_to_dev + (port)); + port->start = 0; + } + } + dev_kfree_skb(skb); + } else { + /* + * Nothing to send so break out of the while loop + */ + break; + } + } + } +} + +static void +do_bottom_half_rx(struct fst_card_info *card) +{ + struct fst_port_info *port; + int pi; + int rx_count = 0; + + /* Check for rx completions on all ports on this card */ + dbg(DBG_RX, "do_bottom_half_rx\n"); + for (pi = 0, port = card->ports; pi < card->nports; pi++, port++) { + if (!port->run) + continue; + + 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 + * Schedule another event + */ + fst_q_work_item(&fst_work_intq, card->card_no); + tasklet_schedule(&fst_int_task); + break; /* Leave the loop */ + } + fst_intr_rx(card, port); + rx_count++; + } + } +} + +/* + * The interrupt service routine + * Dev_id is our fst_card_info pointer + */ +irqreturn_t +fst_intr(int irq, void *dev_id, struct pt_regs *regs) +{ + struct fst_card_info *card; + struct fst_port_info *port; + int rdidx; /* Event buffer indices */ + int wridx; + int event; /* Actual event for processing */ + unsigned int dma_intcsr = 0; + unsigned int do_card_interrupt; + unsigned int int_retry_count; + + if ((card = dev_id) == NULL) { + dbg(DBG_INTR, "intr: spurious %d\n", irq); + return IRQ_NONE; + } + + /* + * Check to see if the interrupt was for this card + * return if not + * Note that the call to clear the interrupt is important + */ + dbg(DBG_INTR, "intr: %d %p\n", irq, card); + if (card->state != FST_RUNNING) { + printk_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 + * a running card + * Clear and reprime the interrupt source + */ + fst_clear_intr(card); + return IRQ_HANDLED; + } + + /* Clear and reprime the interrupt source */ + fst_clear_intr(card); + + /* + * Is the interrupt for this card (handshake == 1) + */ + do_card_interrupt = 0; + if (FST_RDB(card, interruptHandshake) == 1) { + do_card_interrupt += FST_CARD_INT; + /* Set the software acknowledge */ + FST_WRB(card, interruptHandshake, 0xEE); + } + if (card->family == FST_FAMILY_TXU) { + /* + * Is it a DMA Interrupt + */ + dma_intcsr = inl(card->pci_conf + INTCSR_9054); + if (dma_intcsr & 0x00200000) { + /* + * DMA Channel 0 (Rx transfer complete) + */ + dbg(DBG_RX, "DMA Rx xfer complete\n"); + outb(0x8, card->pci_conf + DMACSR0); + fst_rx_dma_complete(card, card->dma_port_rx, + card->dma_len_rx, card->dma_skb_rx, + card->dma_rxpos); + card->dmarx_in_progress = 0; + do_card_interrupt += FST_RX_DMA_INT; + } + if (dma_intcsr & 0x00400000) { + /* + * DMA Channel 1 (Tx transfer complete) + */ + dbg(DBG_TX, "DMA Tx xfer complete\n"); + outb(0x8, card->pci_conf + DMACSR1); + fst_tx_dma_complete(card, card->dma_port_tx, + card->dma_len_tx, card->dma_txpos); + card->dmatx_in_progress = 0; + do_card_interrupt += FST_TX_DMA_INT; + } + } + + /* + * Have we been missing Interrupts + */ + int_retry_count = FST_RDL(card, interruptRetryCount); + if (int_retry_count) { + dbg(DBG_ASS, "Card %d int_retry_count is %d\n", + card->card_no, int_retry_count); + FST_WRL(card, interruptRetryCount, 0); + } + + if (!do_card_interrupt) { + return IRQ_HANDLED; + } + + /* Scehdule the bottom half of the ISR */ + fst_q_work_item(&fst_work_intq, card->card_no); + tasklet_schedule(&fst_int_task); + + /* Drain the event queue */ + rdidx = FST_RDB(card, interruptEvent.rdindex) & 0x1f; + wridx = FST_RDB(card, interruptEvent.wrindex) & 0x1f; + while (rdidx != wridx) { + event = FST_RDB(card, interruptEvent.evntbuff[rdidx]); + port = &card->ports[event & 0x03]; + + dbg(DBG_INTR, "Processing Interrupt event: %x\n", event); + + switch (event) { + case TE1_ALMA: + dbg(DBG_INTR, "TE1 Alarm intr\n"); + if (port->run) + fst_intr_te1_alarm(card, port); + break; + + case CTLA_CHG: + case CTLB_CHG: + case CTLC_CHG: + case CTLD_CHG: + if (port->run) + fst_intr_ctlchg(card, port); + break; + + case ABTA_SENT: + case ABTB_SENT: + case ABTC_SENT: + case ABTD_SENT: + dbg(DBG_TX, "Abort complete port %d\n", port->index); + break; + + case TXA_UNDF: + case TXB_UNDF: + case TXC_UNDF: + case TXD_UNDF: + /* Difficult to see how we'd get this given that we + * always load up the entire packet for DMA. + */ + dbg(DBG_TX, "Tx underflow port %d\n", port->index); + hdlc_stats(port_to_dev(port))->tx_errors++; + hdlc_stats(port_to_dev(port))->tx_fifo_errors++; + dbg(DBG_ASS, "Tx underflow on card %d port %d\n", + card->card_no, port->index); + break; + + case INIT_CPLT: + dbg(DBG_INIT, "Card init OK intr\n"); + break; + + case INIT_FAIL: + dbg(DBG_INIT, "Card init FAILED intr\n"); + card->state = FST_IFAILED; + break; + + default: + printk_err("intr: unknown card event %d. ignored\n", + event); + break; + } + + /* Bump and wrap the index */ + if (++rdidx >= MAX_CIRBUFF) + rdidx = 0; + } + FST_WRB(card, interruptEvent.rdindex, rdidx); + return IRQ_HANDLED; +} + +/* Check that the shared memory configuration is one that we can handle + * and that some basic parameters are correct + */ +static void +check_started_ok(struct fst_card_info *card) +{ + int i; + + /* Check structure version and end marker */ + if (FST_RDW(card, smcVersion) != SMC_VERSION) { + printk_err("Bad shared memory version %d expected %d\n", + FST_RDW(card, smcVersion), SMC_VERSION); + card->state = FST_BADVERSION; + return; + } + if (FST_RDL(card, endOfSmcSignature) != END_SIG) { + printk_err("Missing shared memory signature\n"); + card->state = FST_BADVERSION; + return; + } + /* Firmware status flag, 0x00 = initialising, 0x01 = OK, 0xFF = fail */ + if ((i = FST_RDB(card, taskStatus)) == 0x01) { + card->state = FST_RUNNING; + } else if (i == 0xFF) { + printk_err("Firmware initialisation failed. Card halted\n"); + card->state = FST_HALTED; + return; + } else if (i != 0x00) { + printk_err("Unknown firmware status 0x%x\n", i); + card->state = FST_HALTED; + return; + } + + /* Finally check the number of ports reported by firmware against the + * number we assumed at card detection. Should never happen with + * existing firmware etc so we just report it for the moment. + */ + if (FST_RDL(card, numberOfPorts) != card->nports) { + printk_warn("Port count mismatch on card %d." + " Firmware thinks %d we say %d\n", card->card_no, + FST_RDL(card, numberOfPorts), card->nports); + } +} + +static int +set_conf_from_info(struct fst_card_info *card, struct fst_port_info *port, + struct fstioc_info *info) +{ + int err; + unsigned char my_framing; + + /* Set things according to the user set valid flags + * Several of the old options have been invalidated/replaced by the + * generic hdlc package. + */ + err = 0; + if (info->valid & FSTVAL_PROTO) { + if (info->proto == FST_RAW) + port->mode = FST_RAW; + else + port->mode = FST_GEN_HDLC; + } + + if (info->valid & FSTVAL_CABLE) + err = -EINVAL; + + if (info->valid & FSTVAL_SPEED) + err = -EINVAL; + + if (info->valid & FSTVAL_PHASE) + FST_WRB(card, portConfig[port->index].invertClock, + info->invertClock); + if (info->valid & FSTVAL_MODE) + FST_WRW(card, cardMode, info->cardMode); + if (info->valid & FSTVAL_TE1) { + FST_WRL(card, suConfig.dataRate, info->lineSpeed); + FST_WRB(card, suConfig.clocking, info->clockSource); + my_framing = FRAMING_E1; + if (info->framing == E1) + my_framing = FRAMING_E1; + if (info->framing == T1) + my_framing = FRAMING_T1; + if (info->framing == J1) + my_framing = FRAMING_J1; + FST_WRB(card, suConfig.framing, my_framing); + FST_WRB(card, suConfig.structure, info->structure); + FST_WRB(card, suConfig.interface, info->interface); + FST_WRB(card, suConfig.coding, info->coding); + FST_WRB(card, suConfig.lineBuildOut, info->lineBuildOut); + FST_WRB(card, suConfig.equalizer, info->equalizer); + FST_WRB(card, suConfig.transparentMode, info->transparentMode); + FST_WRB(card, suConfig.loopMode, info->loopMode); + FST_WRB(card, suConfig.range, info->range); + FST_WRB(card, suConfig.txBufferMode, info->txBufferMode); + FST_WRB(card, suConfig.rxBufferMode, info->rxBufferMode); + FST_WRB(card, suConfig.startingSlot, info->startingSlot); + FST_WRB(card, suConfig.losThreshold, info->losThreshold); + if (info->idleCode) + FST_WRB(card, suConfig.enableIdleCode, 1); + else + FST_WRB(card, suConfig.enableIdleCode, 0); + FST_WRB(card, suConfig.idleCode, info->idleCode); +#if FST_DEBUG + if (info->valid & FSTVAL_TE1) { + printk("Setting TE1 data\n"); + printk("Line Speed = %d\n", info->lineSpeed); + printk("Start slot = %d\n", info->startingSlot); + printk("Clock source = %d\n", info->clockSource); + printk("Framing = %d\n", my_framing); + printk("Structure = %d\n", info->structure); + printk("interface = %d\n", info->interface); + printk("Coding = %d\n", info->coding); + printk("Line build out = %d\n", info->lineBuildOut); + printk("Equaliser = %d\n", info->equalizer); + printk("Transparent mode = %d\n", + info->transparentMode); + printk("Loop mode = %d\n", info->loopMode); + printk("Range = %d\n", info->range); + printk("Tx Buffer mode = %d\n", info->txBufferMode); + printk("Rx Buffer mode = %d\n", info->rxBufferMode); + printk("LOS Threshold = %d\n", info->losThreshold); + printk("Idle Code = %d\n", info->idleCode); + } +#endif + } +#if FST_DEBUG + if (info->valid & FSTVAL_DEBUG) { + fst_debug_mask = info->debug; + } +#endif + + return err; +} + +static void +gather_conf_info(struct fst_card_info *card, struct fst_port_info *port, + struct fstioc_info *info) +{ + int i; + + memset(info, 0, sizeof (struct fstioc_info)); + + i = port->index; + info->kernelVersion = LINUX_VERSION_CODE; + info->nports = card->nports; + info->type = card->type; + info->state = card->state; + info->proto = FST_GEN_HDLC; + info->index = i; +#if FST_DEBUG + info->debug = fst_debug_mask; +#endif + + /* Only mark information as valid if card is running. + * Copy the data anyway in case it is useful for diagnostics + */ + info->valid = ((card->state == FST_RUNNING) ? FSTVAL_ALL : FSTVAL_CARD) +#if FST_DEBUG + | FSTVAL_DEBUG +#endif + ; + + info->lineInterface = FST_RDW(card, portConfig[i].lineInterface); + info->internalClock = FST_RDB(card, portConfig[i].internalClock); + info->lineSpeed = FST_RDL(card, portConfig[i].lineSpeed); + info->invertClock = FST_RDB(card, portConfig[i].invertClock); + info->v24IpSts = FST_RDL(card, v24IpSts[i]); + info->v24OpSts = FST_RDL(card, v24OpSts[i]); + info->clockStatus = FST_RDW(card, clockStatus[i]); + info->cableStatus = FST_RDW(card, cableStatus); + info->cardMode = FST_RDW(card, cardMode); + info->smcFirmwareVersion = FST_RDL(card, smcFirmwareVersion); + + /* + * 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 + */ + info->cableStatus = info->cableStatus & 1; + } else { + /* + * Port B + */ + info->cableStatus = info->cableStatus >> 1; + info->cableStatus = info->cableStatus & 1; + } + } + /* + * Some additional bits if we are TE1 + */ + if (card->type == FST_TYPE_TE1) { + info->lineSpeed = FST_RDL(card, suConfig.dataRate); + info->clockSource = FST_RDB(card, suConfig.clocking); + info->framing = FST_RDB(card, suConfig.framing); + info->structure = FST_RDB(card, suConfig.structure); + info->interface = FST_RDB(card, suConfig.interface); + info->coding = FST_RDB(card, suConfig.coding); + info->lineBuildOut = FST_RDB(card, suConfig.lineBuildOut); + info->equalizer = FST_RDB(card, suConfig.equalizer); + info->loopMode = FST_RDB(card, suConfig.loopMode); + info->range = FST_RDB(card, suConfig.range); + info->txBufferMode = FST_RDB(card, suConfig.txBufferMode); + info->rxBufferMode = FST_RDB(card, suConfig.rxBufferMode); + info->startingSlot = FST_RDB(card, suConfig.startingSlot); + info->losThreshold = FST_RDB(card, suConfig.losThreshold); + if (FST_RDB(card, suConfig.enableIdleCode)) + info->idleCode = FST_RDB(card, suConfig.idleCode); + else + info->idleCode = 0; + info->receiveBufferDelay = + FST_RDL(card, suStatus.receiveBufferDelay); + info->framingErrorCount = + FST_RDL(card, suStatus.framingErrorCount); + info->codeViolationCount = + FST_RDL(card, suStatus.codeViolationCount); + info->crcErrorCount = FST_RDL(card, suStatus.crcErrorCount); + info->lineAttenuation = FST_RDL(card, suStatus.lineAttenuation); + info->lossOfSignal = FST_RDB(card, suStatus.lossOfSignal); + info->receiveRemoteAlarm = + FST_RDB(card, suStatus.receiveRemoteAlarm); + info->alarmIndicationSignal = + FST_RDB(card, suStatus.alarmIndicationSignal); + } +} + +static int +fst_set_iface(struct fst_card_info *card, struct fst_port_info *port, + struct ifreq *ifr) +{ + sync_serial_settings sync; + int i; + + if (ifr->ifr_settings.size != sizeof (sync)) { + return -ENOMEM; + } + + if (copy_from_user + (&sync, ifr->ifr_settings.ifs_ifsu.sync, sizeof (sync))) { + return -EFAULT; + } + + if (sync.loopback) + return -EINVAL; + + i = port->index; + + switch (ifr->ifr_settings.type) { + case IF_IFACE_V35: + FST_WRW(card, portConfig[i].lineInterface, V35); + port->hwif = V35; + break; + + case IF_IFACE_V24: + FST_WRW(card, portConfig[i].lineInterface, V24); + port->hwif = V24; + break; + + case IF_IFACE_X21: + FST_WRW(card, portConfig[i].lineInterface, X21); + port->hwif = X21; + break; + + case IF_IFACE_X21D: + FST_WRW(card, portConfig[i].lineInterface, X21D); + port->hwif = X21D; + break; + + case IF_IFACE_T1: + FST_WRW(card, portConfig[i].lineInterface, T1); + port->hwif = T1; + break; + + case IF_IFACE_E1: + FST_WRW(card, portConfig[i].lineInterface, E1); + port->hwif = E1; + break; + + case IF_IFACE_SYNC_SERIAL: + break; + + default: + return -EINVAL; + } + + switch (sync.clock_type) { + case CLOCK_EXT: + FST_WRB(card, portConfig[i].internalClock, EXTCLK); + break; + + case CLOCK_INT: + FST_WRB(card, portConfig[i].internalClock, INTCLK); + break; + + default: + return -EINVAL; + } + FST_WRL(card, portConfig[i].lineSpeed, sync.clock_rate); + return 0; +} + +static int +fst_get_iface(struct fst_card_info *card, struct fst_port_info *port, + struct ifreq *ifr) +{ + sync_serial_settings sync; + int i; + + /* First check what line type is set, we'll default to reporting X.21 + * if nothing is set as IF_IFACE_SYNC_SERIAL implies it can't be + * changed + */ + switch (port->hwif) { + case E1: + ifr->ifr_settings.type = IF_IFACE_E1; + break; + case T1: + ifr->ifr_settings.type = IF_IFACE_T1; + break; + case V35: + ifr->ifr_settings.type = IF_IFACE_V35; + break; + case V24: + ifr->ifr_settings.type = IF_IFACE_V24; + break; + case X21D: + ifr->ifr_settings.type = IF_IFACE_X21D; + break; + case X21: + default: + ifr->ifr_settings.type = IF_IFACE_X21; + break; + } + if (ifr->ifr_settings.size == 0) { + return 0; /* only type requested */ + } + if (ifr->ifr_settings.size < sizeof (sync)) { + return -ENOMEM; + } + + i = port->index; + sync.clock_rate = FST_RDL(card, portConfig[i].lineSpeed); + /* Lucky card and linux use same encoding here */ + sync.clock_type = FST_RDB(card, portConfig[i].internalClock) == + INTCLK ? CLOCK_INT : CLOCK_EXT; + sync.loopback = 0; + + if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &sync, sizeof (sync))) { + return -EFAULT; + } + + ifr->ifr_settings.size = sizeof (sync); + return 0; +} + +static int +fst_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + struct fst_card_info *card; + struct fst_port_info *port; + struct fstioc_write wrthdr; + struct fstioc_info info; + unsigned long flags; + + dbg(DBG_IOCTL, "ioctl: %x, %p\n", cmd, ifr->ifr_data); + + port = dev_to_port(dev); + card = port->card; + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + switch (cmd) { + case FSTCPURESET: + fst_cpureset(card); + card->state = FST_RESET; + return 0; + + case FSTCPURELEASE: + fst_cpurelease(card); + card->state = FST_STARTING; + return 0; + + case FSTWRITE: /* Code write (download) */ + + /* First copy in the header with the length and offset of data + * to write + */ + if (ifr->ifr_data == NULL) { + return -EINVAL; + } + if (copy_from_user(&wrthdr, ifr->ifr_data, + sizeof (struct fstioc_write))) { + return -EFAULT; + } + + /* Sanity check the parameters. We don't support partial writes + * when going over the top + */ + if (wrthdr.size > FST_MEMSIZE || wrthdr.offset > FST_MEMSIZE + || wrthdr.size + wrthdr.offset > FST_MEMSIZE) { + return -ENXIO; + } + + /* Now copy the data to the card. + * This will probably break on some architectures. + * I'll fix it when I have something to test on. + */ + if (copy_from_user(card->mem + wrthdr.offset, + ifr->ifr_data + sizeof (struct fstioc_write), + wrthdr.size)) { + return -EFAULT; + } + + /* Writes to the memory of a card in the reset state constitute + * a download + */ + if (card->state == FST_RESET) { + card->state = FST_DOWNLOAD; + } + return 0; + + case FSTGETCONF: + + /* If card has just been started check the shared memory config + * version and marker + */ + if (card->state == FST_STARTING) { + check_started_ok(card); + + /* If everything checked out enable card interrupts */ + if (card->state == FST_RUNNING) { + spin_lock_irqsave(&card->card_lock, flags); + fst_enable_intr(card); + FST_WRB(card, interruptHandshake, 0xEE); + spin_unlock_irqrestore(&card->card_lock, flags); + } + } + + if (ifr->ifr_data == NULL) { + return -EINVAL; + } + + gather_conf_info(card, port, &info); + + if (copy_to_user(ifr->ifr_data, &info, sizeof (info))) { + return -EFAULT; + } + return 0; + + case FSTSETCONF: + + /* + * Most of the settings have been moved to the generic ioctls + * this just covers debug and board ident now + */ + + if (card->state != FST_RUNNING) { + printk_err + ("Attempt to configure card %d in non-running state (%d)\n", + card->card_no, card->state); + return -EIO; + } + if (copy_from_user(&info, ifr->ifr_data, sizeof (info))) { + return -EFAULT; + } + + return set_conf_from_info(card, port, &info); + + case SIOCWANDEV: + switch (ifr->ifr_settings.type) { + case IF_GET_IFACE: + return fst_get_iface(card, port, ifr); + + case IF_IFACE_SYNC_SERIAL: + case IF_IFACE_V35: + case IF_IFACE_V24: + case IF_IFACE_X21: + case IF_IFACE_X21D: + case IF_IFACE_T1: + case IF_IFACE_E1: + return fst_set_iface(card, port, ifr); + + case IF_PROTO_RAW: + port->mode = FST_RAW; + return 0; + + case IF_GET_PROTO: + if (port->mode == FST_RAW) { + ifr->ifr_settings.type = IF_PROTO_RAW; + return 0; + } + return hdlc_ioctl(dev, ifr, cmd); + + default: + port->mode = FST_GEN_HDLC; + dbg(DBG_IOCTL, "Passing this type to hdlc %x\n", + ifr->ifr_settings.type); + return hdlc_ioctl(dev, ifr, cmd); + } + + default: + /* Not one of ours. Pass through to HDLC package */ + return hdlc_ioctl(dev, ifr, cmd); + } +} + +static void +fst_openport(struct fst_port_info *port) +{ + int signals; + int txq_length; + + /* Only init things if card is actually running. This allows open to + * succeed for downloads etc. + */ + if (port->card->state == FST_RUNNING) { + if (port->run) { + dbg(DBG_OPEN, "open: found port already running\n"); + + fst_issue_cmd(port, STOPPORT); + port->run = 0; + } + + fst_rx_config(port); + fst_tx_config(port); + fst_op_raise(port, OPSTS_RTS | OPSTS_DTR); + + fst_issue_cmd(port, STARTPORT); + port->run = 1; + + signals = FST_RDL(port->card, v24DebouncedSts[port->index]); + if (signals & (((port->hwif == X21) || (port->hwif == X21D)) + ? IPSTS_INDICATE : IPSTS_DCD)) + netif_carrier_on(port_to_dev(port)); + else + netif_carrier_off(port_to_dev(port)); + + txq_length = port->txqe - port->txqs; + port->txqe = 0; + port->txqs = 0; + } + +} + +static void +fst_closeport(struct fst_port_info *port) +{ + if (port->card->state == FST_RUNNING) { + if (port->run) { + port->run = 0; + fst_op_lower(port, OPSTS_RTS | OPSTS_DTR); + + fst_issue_cmd(port, STOPPORT); + } else { + dbg(DBG_OPEN, "close: port not running\n"); + } + } +} + +static int +fst_open(struct net_device *dev) +{ + int err; + struct fst_port_info *port; + + port = dev_to_port(dev); + if (!try_module_get(THIS_MODULE)) + return -EBUSY; + + if (port->mode != FST_RAW) { + err = hdlc_open(dev); + if (err) + return err; + } + + fst_openport(port); + netif_wake_queue(dev); + return 0; +} + +static int +fst_close(struct net_device *dev) +{ + struct fst_port_info *port; + struct fst_card_info *card; + unsigned char tx_dma_done; + unsigned char rx_dma_done; + + port = dev_to_port(dev); + card = port->card; + + tx_dma_done = inb(card->pci_conf + DMACSR1); + rx_dma_done = inb(card->pci_conf + DMACSR0); + dbg(DBG_OPEN, + "Port Close: tx_dma_in_progress = %d (%x) rx_dma_in_progress = %d (%x)\n", + card->dmatx_in_progress, tx_dma_done, card->dmarx_in_progress, + rx_dma_done); + + netif_stop_queue(dev); + fst_closeport(dev_to_port(dev)); + if (port->mode != FST_RAW) { + hdlc_close(dev); + } + module_put(THIS_MODULE); + return 0; +} + +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 + */ + if (encoding != ENCODING_NRZ || parity != PARITY_CRC16_PR1_CCITT) + return -EINVAL; + return 0; +} + +static void +fst_tx_timeout(struct net_device *dev) +{ + struct fst_port_info *port; + struct fst_card_info *card; + struct net_device_stats *stats = hdlc_stats(dev); + + port = dev_to_port(dev); + card = port->card; + stats->tx_errors++; + stats->tx_aborted_errors++; + dbg(DBG_ASS, "Tx timeout card %d port %d\n", + card->card_no, port->index); + fst_issue_cmd(port, ABORTTX); + + dev->trans_start = jiffies; + netif_wake_queue(dev); + port->start = 0; +} + +static int +fst_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct fst_card_info *card; + struct fst_port_info *port; + struct net_device_stats *stats = hdlc_stats(dev); + unsigned long flags; + int txq_length; + + port = dev_to_port(dev); + card = port->card; + dbg(DBG_TX, "fst_start_xmit: length = %d\n", skb->len); + + /* Drop packet with error if we don't have carrier */ + if (!netif_carrier_ok(dev)) { + dev_kfree_skb(skb); + stats->tx_errors++; + stats->tx_carrier_errors++; + dbg(DBG_ASS, + "Tried to transmit but no carrier on card %d port %d\n", + card->card_no, port->index); + return 0; + } + + /* Drop it if it's too big! MTU failure ? */ + if (skb->len > LEN_TX_BUFFER) { + dbg(DBG_ASS, "Packet too large %d vs %d\n", skb->len, + LEN_TX_BUFFER); + dev_kfree_skb(skb); + stats->tx_errors++; + return 0; + } + + /* + * 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); + if ((txq_length = port->txqe - port->txqs) < 0) { + /* + * 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 + * layer to stop sending frames down + */ + netif_stop_queue(dev); + port->start = 1; /* I'm using this to signal stop sent up */ + } + + if (txq_length == FST_TXQ_DEPTH - 1) { + /* + * This shouldn't have happened but such is life + */ + dev_kfree_skb(skb); + stats->tx_errors++; + dbg(DBG_ASS, "Tx queue overflow card %d port %d\n", + card->card_no, port->index); + return 0; + } + + /* + * queue the buffer + */ + spin_lock_irqsave(&card->card_lock, flags); + port->txq[port->txqe] = skb; + port->txqe++; + if (port->txqe == FST_TXQ_DEPTH) + port->txqe = 0; + spin_unlock_irqrestore(&card->card_lock, flags); + + /* Scehdule the bottom half which now does transmit processing */ + fst_q_work_item(&fst_work_txq, card->card_no); + tasklet_schedule(&fst_tx_task); + + return 0; +} + +/* + * 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 + * disabled. + */ +static char *type_strings[] __devinitdata = { + "no hardware", /* Should never be seen */ + "FarSync T2P", + "FarSync T4P", + "FarSync T1U", + "FarSync T2U", + "FarSync T4U", + "FarSync TE1" +}; + +static void __devinit +fst_init_card(struct fst_card_info *card) +{ + int i; + int err; + + /* We're working on a number of ports based on the card ID. If the + * firmware detects something different later (should never happen) + * we'll have to revise it in some way then. + */ + for (i = 0; i < card->nports; i++) { + err = register_hdlc_device(card->ports[i].dev); + if (err < 0) { + int j; + printk_err ("Cannot register HDLC device for port %d" + " (errno %d)\n", i, -err ); + for (j = i; j < card->nports; j++) { + free_netdev(card->ports[j].dev); + card->ports[j].dev = NULL; + } + card->nports = i; + break; + } + } + + printk_info("%s-%s: %s IRQ%d, %d ports\n", + port_to_dev(&card->ports[0])->name, + port_to_dev(&card->ports[card->nports - 1])->name, + type_strings[card->type], card->irq, card->nports); +} + +/* + * Initialise card when detected. + * Returns 0 to indicate success, or errno otherwise. + */ +static int __devinit +fst_add_one(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + static int firsttime_done = 0; + static int no_of_cards_added = 0; + struct fst_card_info *card; + int err = 0; + int i; + + if (!firsttime_done) { + printk_info("FarSync WAN driver " FST_USER_VERSION + " (c) 2001-2004 FarSite Communications Ltd.\n"); + firsttime_done = 1; + dbg(DBG_ASS, "The value of debug mask is %x\n", fst_debug_mask); + } + + /* + * 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 + * + */ + for (i = 0; i < fst_excluded_cards; i++) { + if ((pdev->devfn) >> 3 == fst_excluded_list[i]) { + printk_info("FarSync PCI device %d not assigned\n", + (pdev->devfn) >> 3); + return -EBUSY; + } + } + } + + /* Allocate driver private data */ + card = kmalloc(sizeof (struct fst_card_info), GFP_KERNEL); + if (card == NULL) { + printk_err("FarSync card found but insufficient memory for" + " driver storage\n"); + return -ENOMEM; + } + memset(card, 0, sizeof (struct fst_card_info)); + + /* Try to enable the device */ + if ((err = pci_enable_device(pdev)) != 0) { + printk_err("Failed to enable card. Err %d\n", -err); + kfree(card); + return err; + } + + if ((err = pci_request_regions(pdev, "FarSync")) !=0) { + printk_err("Failed to allocate regions. Err %d\n", -err); + pci_disable_device(pdev); + kfree(card); + return err; + } + + /* Get virtual addresses of memory regions */ + card->pci_conf = pci_resource_start(pdev, 1); + card->phys_mem = pci_resource_start(pdev, 2); + card->phys_ctlmem = pci_resource_start(pdev, 3); + if ((card->mem = ioremap(card->phys_mem, FST_MEMSIZE)) == NULL) { + printk_err("Physical memory remap failed\n"); + pci_release_regions(pdev); + pci_disable_device(pdev); + kfree(card); + return -ENODEV; + } + if ((card->ctlmem = ioremap(card->phys_ctlmem, 0x10)) == NULL) { + printk_err("Control memory remap failed\n"); + pci_release_regions(pdev); + pci_disable_device(pdev); + kfree(card); + return -ENODEV; + } + dbg(DBG_PCI, "kernel mem %p, ctlmem %p\n", card->mem, card->ctlmem); + + /* Register the interrupt handler */ + if (request_irq(pdev->irq, fst_intr, SA_SHIRQ, FST_DEV_NAME, card)) { + printk_err("Unable to register interrupt %d\n", card->irq); + pci_release_regions(pdev); + pci_disable_device(pdev); + iounmap(card->ctlmem); + iounmap(card->mem); + kfree(card); + return -ENODEV; + } + + /* Record info we need */ + card->irq = pdev->irq; + card->type = ent->driver_data; + card->family = ((ent->driver_data == FST_TYPE_T2P) || + (ent->driver_data == FST_TYPE_T4P)) + ? FST_FAMILY_TXP : FST_FAMILY_TXU; + if ((ent->driver_data == FST_TYPE_T1U) || + (ent->driver_data == FST_TYPE_TE1)) + card->nports = 1; + else + card->nports = ((ent->driver_data == FST_TYPE_T2P) || + (ent->driver_data == FST_TYPE_T2U)) ? 2 : 4; + + card->state = FST_UNINIT; + spin_lock_init ( &card->card_lock ); + + for ( i = 0 ; i < card->nports ; i++ ) { + struct net_device *dev = alloc_hdlcdev(&card->ports[i]); + hdlc_device *hdlc; + if (!dev) { + while (i--) + free_netdev(card->ports[i].dev); + printk_err ("FarSync: out of memory\n"); + free_irq(card->irq, card); + pci_release_regions(pdev); + pci_disable_device(pdev); + iounmap(card->ctlmem); + iounmap(card->mem); + kfree(card); + return -ENODEV; + } + card->ports[i].dev = dev; + card->ports[i].card = card; + card->ports[i].index = i; + card->ports[i].run = 0; + + hdlc = dev_to_hdlc(dev); + + /* Fill in the net device info */ + /* Since this is a PCI setup this is purely + * informational. Give them the buffer addresses + * and basic card I/O. + */ + dev->mem_start = card->phys_mem + + BUF_OFFSET ( txBuffer[i][0][0]); + dev->mem_end = card->phys_mem + + BUF_OFFSET ( txBuffer[i][NUM_TX_BUFFER][0]); + dev->base_addr = card->pci_conf; + dev->irq = card->irq; + + dev->tx_queue_len = FST_TX_QUEUE_LEN; + dev->open = fst_open; + dev->stop = fst_close; + dev->do_ioctl = fst_ioctl; + dev->watchdog_timeo = FST_TX_TIMEOUT; + dev->tx_timeout = fst_tx_timeout; + hdlc->attach = fst_attach; + hdlc->xmit = fst_start_xmit; + } + + card->device = pdev; + + dbg(DBG_PCI, "type %d nports %d irq %d\n", card->type, + card->nports, card->irq); + dbg(DBG_PCI, "conf %04x mem %08x ctlmem %08x\n", + card->pci_conf, card->phys_mem, card->phys_ctlmem); + + /* Reset the card's processor */ + fst_cpureset(card); + card->state = FST_RESET; + + /* Initialise DMA (if required) */ + fst_init_dma(card); + + /* Record driver data for later use */ + pci_set_drvdata(pdev, card); + + /* Remainder of card setup */ + fst_card_array[no_of_cards_added] = card; + card->card_no = no_of_cards_added++; /* Record instance and bump it */ + fst_init_card(card); + if (card->family == FST_FAMILY_TXU) { + /* + * Allocate a dma buffer for transmit and receives + */ + card->rx_dma_handle_host = + pci_alloc_consistent(card->device, FST_MAX_MTU, + &card->rx_dma_handle_card); + if (card->rx_dma_handle_host == NULL) { + printk_err("Could not allocate rx dma buffer\n"); + fst_disable_intr(card); + pci_release_regions(pdev); + pci_disable_device(pdev); + iounmap(card->ctlmem); + iounmap(card->mem); + kfree(card); + return -ENOMEM; + } + card->tx_dma_handle_host = + pci_alloc_consistent(card->device, FST_MAX_MTU, + &card->tx_dma_handle_card); + if (card->tx_dma_handle_host == NULL) { + printk_err("Could not allocate tx dma buffer\n"); + fst_disable_intr(card); + pci_release_regions(pdev); + pci_disable_device(pdev); + iounmap(card->ctlmem); + iounmap(card->mem); + kfree(card); + return -ENOMEM; + } + } + return 0; /* Success */ +} + +/* + * Cleanup and close down a card + */ +static void __devexit +fst_remove_one(struct pci_dev *pdev) +{ + struct fst_card_info *card; + int i; + + card = pci_get_drvdata(pdev); + + for (i = 0; i < card->nports; i++) { + struct net_device *dev = port_to_dev(&card->ports[i]); + unregister_hdlc_device(dev); + } + + fst_disable_intr(card); + free_irq(card->irq, card); + + iounmap(card->ctlmem); + iounmap(card->mem); + pci_release_regions(pdev); + if (card->family == FST_FAMILY_TXU) { + /* + * Free dma buffers + */ + pci_free_consistent(card->device, FST_MAX_MTU, + card->rx_dma_handle_host, + card->rx_dma_handle_card); + pci_free_consistent(card->device, FST_MAX_MTU, + card->tx_dma_handle_host, + card->tx_dma_handle_card); + } + fst_card_array[card->card_no] = NULL; +} + +static struct pci_driver fst_driver = { + .name = FST_NAME, + .id_table = fst_pci_dev_id, + .probe = fst_add_one, + .remove = __devexit_p(fst_remove_one), + .suspend = NULL, + .resume = NULL, +}; + +static int __init +fst_init(void) +{ + int i; + + for (i = 0; i < FST_MAX_CARDS; i++) + fst_card_array[i] = NULL; + spin_lock_init(&fst_work_q_lock); + return pci_module_init(&fst_driver); +} + +static void __exit +fst_cleanup_module(void) +{ + printk_info("FarSync WAN driver unloading\n"); + pci_unregister_driver(&fst_driver); +} + +module_init(fst_init); +module_exit(fst_cleanup_module); |