diff options
Diffstat (limited to 'drivers/net/ethernet/i825xx/lp486e.c')
| -rw-r--r-- | drivers/net/ethernet/i825xx/lp486e.c | 1339 |
1 files changed, 1339 insertions, 0 deletions
diff --git a/drivers/net/ethernet/i825xx/lp486e.c b/drivers/net/ethernet/i825xx/lp486e.c new file mode 100644 index 000000000000..414044b3cb11 --- /dev/null +++ b/drivers/net/ethernet/i825xx/lp486e.c @@ -0,0 +1,1339 @@ +/* Intel Professional Workstation/panther ethernet driver */ +/* lp486e.c: A panther 82596 ethernet driver for linux. */ +/* + History and copyrights: + + Driver skeleton + Written 1993 by Donald Becker. + Copyright 1993 United States Government as represented by the Director, + National Security Agency. This software may only be used and + distributed according to the terms of the GNU General Public License + as modified by SRC, incorporated herein by reference. + + The author may be reached as becker@scyld.com, or C/O + Scyld Computing Corporation + 410 Severn Ave., Suite 210 + Annapolis MD 21403 + + Apricot + Written 1994 by Mark Evans. + This driver is for the Apricot 82596 bus-master interface + + Modularised 12/94 Mark Evans + + Professional Workstation + Derived from apricot.c by Ard van Breemen + <ard@murphy.nl>|<ard@cstmel.hobby.nl>|<ard@cstmel.nl.eu.org> + + Credits: + Thanks to Murphy Software BV for letting me write this in their time. + Well, actually, I get paid doing this... + (Also: see http://www.murphy.nl for murphy, and my homepage ~ard for + more information on the Professional Workstation) + + Present version + aeb@cwi.nl +*/ +/* + There are currently two motherboards that I know of in the + professional workstation. The only one that I know is the + intel panther motherboard. -- ard +*/ +/* +The pws is equipped with an intel 82596. This is a very intelligent controller +which runs its own micro-code. Communication with the hostprocessor is done +through linked lists of commands and buffers in the hostprocessors memory. +A complete description of the 82596 is available from intel. Search for +a file called "29021806.pdf". It is a complete description of the chip itself. +To use it for the pws some additions are needed regarding generation of +the PORT and CA signal, and the interrupt glue needed for a pc. +I/O map: +PORT SIZE ACTION MEANING +0xCB0 2 WRITE Lower 16 bits for PORT command +0xCB2 2 WRITE Upper 16 bits for PORT command, and issue of PORT command +0xCB4 1 WRITE Generation of CA signal +0xCB8 1 WRITE Clear interrupt glue +All other communication is through memory! +*/ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/bitops.h> + +#include <asm/io.h> +#include <asm/dma.h> + +#define DRV_NAME "lp486e" + +/* debug print flags */ +#define LOG_SRCDST 0x80000000 +#define LOG_STATINT 0x40000000 +#define LOG_STARTINT 0x20000000 + +#define i596_debug debug + +static int i596_debug = 0; + +static const char * const medianame[] = { + "10baseT", "AUI", + "10baseT-FD", "AUI-FD", +}; + +#define LP486E_TOTAL_SIZE 16 + +#define I596_NULL (0xffffffff) + +#define CMD_EOL 0x8000 /* The last command of the list, stop. */ +#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */ +#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */ + +#define CMD_FLEX 0x0008 /* Enable flexible memory model */ + +enum commands { + CmdNOP = 0, + CmdIASetup = 1, + CmdConfigure = 2, + CmdMulticastList = 3, + CmdTx = 4, + CmdTDR = 5, + CmdDump = 6, + CmdDiagnose = 7 +}; + +#if 0 +static const char *CUcmdnames[8] = { "NOP", "IASetup", "Configure", "MulticastList", + "Tx", "TDR", "Dump", "Diagnose" }; +#endif + +/* Status word bits */ +#define STAT_CX 0x8000 /* The CU finished executing a command + with the Interrupt bit set */ +#define STAT_FR 0x4000 /* The RU finished receiving a frame */ +#define STAT_CNA 0x2000 /* The CU left the active state */ +#define STAT_RNR 0x1000 /* The RU left the active state */ +#define STAT_ACK (STAT_CX | STAT_FR | STAT_CNA | STAT_RNR) +#define STAT_CUS 0x0700 /* Status of CU: 0: idle, 1: suspended, + 2: active, 3-7: unused */ +#define STAT_RUS 0x00f0 /* Status of RU: 0: idle, 1: suspended, + 2: no resources, 4: ready, + 10: no resources due to no more RBDs, + 12: no more RBDs, other: unused */ +#define STAT_T 0x0008 /* Bus throttle timers loaded */ +#define STAT_ZERO 0x0807 /* Always zero */ + +#if 0 +static char *CUstates[8] = { + "idle", "suspended", "active", 0, 0, 0, 0, 0 +}; +static char *RUstates[16] = { + "idle", "suspended", "no resources", 0, "ready", 0, 0, 0, + 0, 0, "no RBDs", 0, "out of RBDs", 0, 0, 0 +}; + +static void +i596_out_status(int status) { + int bad = 0; + char *s; + + printk("status %4.4x:", status); + if (status == 0xffff) + printk(" strange..\n"); + else { + if (status & STAT_CX) + printk(" CU done"); + if (status & STAT_CNA) + printk(" CU stopped"); + if (status & STAT_FR) + printk(" got a frame"); + if (status & STAT_RNR) + printk(" RU stopped"); + if (status & STAT_T) + printk(" throttled"); + if (status & STAT_ZERO) + bad = 1; + s = CUstates[(status & STAT_CUS) >> 8]; + if (!s) + bad = 1; + else + printk(" CU(%s)", s); + s = RUstates[(status & STAT_RUS) >> 4]; + if (!s) + bad = 1; + else + printk(" RU(%s)", s); + if (bad) + printk(" bad status"); + printk("\n"); + } +} +#endif + +/* Command word bits */ +#define ACK_CX 0x8000 +#define ACK_FR 0x4000 +#define ACK_CNA 0x2000 +#define ACK_RNR 0x1000 + +#define CUC_START 0x0100 +#define CUC_RESUME 0x0200 +#define CUC_SUSPEND 0x0300 +#define CUC_ABORT 0x0400 + +#define RX_START 0x0010 +#define RX_RESUME 0x0020 +#define RX_SUSPEND 0x0030 +#define RX_ABORT 0x0040 + +typedef u32 phys_addr; + +static inline phys_addr +va_to_pa(void *x) { + return x ? virt_to_bus(x) : I596_NULL; +} + +static inline void * +pa_to_va(phys_addr x) { + return (x == I596_NULL) ? NULL : bus_to_virt(x); +} + +/* status bits for cmd */ +#define CMD_STAT_C 0x8000 /* CU command complete */ +#define CMD_STAT_B 0x4000 /* CU command in progress */ +#define CMD_STAT_OK 0x2000 /* CU command completed without errors */ +#define CMD_STAT_A 0x1000 /* CU command abnormally terminated */ + +struct i596_cmd { /* 8 bytes */ + unsigned short status; + unsigned short command; + phys_addr pa_next; /* va_to_pa(struct i596_cmd *next) */ +}; + +#define EOF 0x8000 +#define SIZE_MASK 0x3fff + +struct i596_tbd { + unsigned short size; + unsigned short pad; + phys_addr pa_next; /* va_to_pa(struct i596_tbd *next) */ + phys_addr pa_data; /* va_to_pa(char *data) */ + struct sk_buff *skb; +}; + +struct tx_cmd { + struct i596_cmd cmd; + phys_addr pa_tbd; /* va_to_pa(struct i596_tbd *tbd) */ + unsigned short size; + unsigned short pad; +}; + +/* status bits for rfd */ +#define RFD_STAT_C 0x8000 /* Frame reception complete */ +#define RFD_STAT_B 0x4000 /* Frame reception in progress */ +#define RFD_STAT_OK 0x2000 /* Frame received without errors */ +#define RFD_STATUS 0x1fff +#define RFD_LENGTH_ERR 0x1000 +#define RFD_CRC_ERR 0x0800 +#define RFD_ALIGN_ERR 0x0400 +#define RFD_NOBUFS_ERR 0x0200 +#define RFD_DMA_ERR 0x0100 /* DMA overrun failure to acquire system bus */ +#define RFD_SHORT_FRAME_ERR 0x0080 +#define RFD_NOEOP_ERR 0x0040 +#define RFD_TRUNC_ERR 0x0020 +#define RFD_MULTICAST 0x0002 /* 0: destination had our address + 1: destination was broadcast/multicast */ +#define RFD_COLLISION 0x0001 + +/* receive frame descriptor */ +struct i596_rfd { + unsigned short stat; + unsigned short cmd; + phys_addr pa_next; /* va_to_pa(struct i596_rfd *next) */ + phys_addr pa_rbd; /* va_to_pa(struct i596_rbd *rbd) */ + unsigned short count; + unsigned short size; + char data[1532]; +}; + +#define RBD_EL 0x8000 +#define RBD_P 0x4000 +#define RBD_SIZEMASK 0x3fff +#define RBD_EOF 0x8000 +#define RBD_F 0x4000 + +/* receive buffer descriptor */ +struct i596_rbd { + unsigned short size; + unsigned short pad; + phys_addr pa_next; /* va_to_pa(struct i596_tbd *next) */ + phys_addr pa_data; /* va_to_pa(char *data) */ + phys_addr pa_prev; /* va_to_pa(struct i596_tbd *prev) */ + + /* Driver private part */ + struct sk_buff *skb; +}; + +#define RX_RING_SIZE 64 +#define RX_SKBSIZE (ETH_FRAME_LEN+10) +#define RX_RBD_SIZE 32 + +/* System Control Block - 40 bytes */ +struct i596_scb { + u16 status; /* 0 */ + u16 command; /* 2 */ + phys_addr pa_cmd; /* 4 - va_to_pa(struct i596_cmd *cmd) */ + phys_addr pa_rfd; /* 8 - va_to_pa(struct i596_rfd *rfd) */ + u32 crc_err; /* 12 */ + u32 align_err; /* 16 */ + u32 resource_err; /* 20 */ + u32 over_err; /* 24 */ + u32 rcvdt_err; /* 28 */ + u32 short_err; /* 32 */ + u16 t_on; /* 36 */ + u16 t_off; /* 38 */ +}; + +/* Intermediate System Configuration Pointer - 8 bytes */ +struct i596_iscp { + u32 busy; /* 0 */ + phys_addr pa_scb; /* 4 - va_to_pa(struct i596_scb *scb) */ +}; + +/* System Configuration Pointer - 12 bytes */ +struct i596_scp { + u32 sysbus; /* 0 */ + u32 pad; /* 4 */ + phys_addr pa_iscp; /* 8 - va_to_pa(struct i596_iscp *iscp) */ +}; + +/* Selftest and dump results - needs 16-byte alignment */ +/* + * The size of the dump area is 304 bytes. When the dump is executed + * by the Port command an extra word will be appended to the dump area. + * The extra word is a copy of the Dump status word (containing the + * C, B, OK bits). [I find 0xa006, with a0 for C+OK and 6 for dump] + */ +struct i596_dump { + u16 dump[153]; /* (304 = 130h) + 2 bytes */ +}; + +struct i596_private { /* aligned to a 16-byte boundary */ + struct i596_scp scp; /* 0 - needs 16-byte alignment */ + struct i596_iscp iscp; /* 12 */ + struct i596_scb scb; /* 20 */ + u32 dummy; /* 60 */ + struct i596_dump dump; /* 64 - needs 16-byte alignment */ + + struct i596_cmd set_add; + char eth_addr[8]; /* directly follows set_add */ + + struct i596_cmd set_conf; + char i596_config[16]; /* directly follows set_conf */ + + struct i596_cmd tdr; + unsigned long tdr_stat; /* directly follows tdr */ + + int last_restart; + struct i596_rbd *rbd_list; + struct i596_rbd *rbd_tail; + struct i596_rfd *rx_tail; + struct i596_cmd *cmd_tail; + struct i596_cmd *cmd_head; + int cmd_backlog; + unsigned long last_cmd; + spinlock_t cmd_lock; +}; + +static char init_setup[14] = { + 0x8E, /* length 14 bytes, prefetch on */ + 0xC8, /* default: fifo to 8, monitor off */ + 0x40, /* default: don't save bad frames (apricot.c had 0x80) */ + 0x2E, /* (default is 0x26) + No source address insertion, 8 byte preamble */ + 0x00, /* default priority and backoff */ + 0x60, /* default interframe spacing */ + 0x00, /* default slot time LSB */ + 0xf2, /* default slot time and nr of retries */ + 0x00, /* default various bits + (0: promiscuous mode, 1: broadcast disable, + 2: encoding mode, 3: transmit on no CRS, + 4: no CRC insertion, 5: CRC type, + 6: bit stuffing, 7: padding) */ + 0x00, /* default carrier sense and collision detect */ + 0x40, /* default minimum frame length */ + 0xff, /* (default is 0xff, and that is what apricot.c has; + elp486.c has 0xfb: Enable crc append in memory.) */ + 0x00, /* default: not full duplex */ + 0x7f /* (default is 0x3f) multi IA */ +}; + +static int i596_open(struct net_device *dev); +static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev); +static irqreturn_t i596_interrupt(int irq, void *dev_id); +static int i596_close(struct net_device *dev); +static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd); +static void print_eth(char *); +static void set_multicast_list(struct net_device *dev); +static void i596_tx_timeout(struct net_device *dev); + +static int +i596_timeout(struct net_device *dev, char *msg, int ct) { + struct i596_private *lp; + int boguscnt = ct; + + lp = netdev_priv(dev); + while (lp->scb.command) { + if (--boguscnt == 0) { + printk("%s: %s timed out - stat %4.4x, cmd %4.4x\n", + dev->name, msg, + lp->scb.status, lp->scb.command); + return 1; + } + udelay(5); + barrier(); + } + return 0; +} + +static inline int +init_rx_bufs(struct net_device *dev, int num) { + struct i596_private *lp; + struct i596_rfd *rfd; + int i; + // struct i596_rbd *rbd; + + lp = netdev_priv(dev); + lp->scb.pa_rfd = I596_NULL; + + for (i = 0; i < num; i++) { + rfd = kmalloc(sizeof(struct i596_rfd), GFP_KERNEL); + if (rfd == NULL) + break; + + rfd->stat = 0; + rfd->pa_rbd = I596_NULL; + rfd->count = 0; + rfd->size = 1532; + if (i == 0) { + rfd->cmd = CMD_EOL; + lp->rx_tail = rfd; + } else { + rfd->cmd = 0; + } + rfd->pa_next = lp->scb.pa_rfd; + lp->scb.pa_rfd = va_to_pa(rfd); + lp->rx_tail->pa_next = lp->scb.pa_rfd; + } + +#if 0 + for (i = 0; i<RX_RBD_SIZE; i++) { + rbd = kmalloc(sizeof(struct i596_rbd), GFP_KERNEL); + if (rbd) { + rbd->pad = 0; + rbd->count = 0; + rbd->skb = dev_alloc_skb(RX_SKBSIZE); + if (!rbd->skb) { + printk("dev_alloc_skb failed"); + } + rbd->next = rfd->rbd; + if (i) { + rfd->rbd->prev = rbd; + rbd->size = RX_SKBSIZE; + } else { + rbd->size = (RX_SKBSIZE | RBD_EL); + lp->rbd_tail = rbd; + } + + rfd->rbd = rbd; + } else { + printk("Could not kmalloc rbd\n"); + } + } + lp->rbd_tail->next = rfd->rbd; +#endif + return i; +} + +static inline void +remove_rx_bufs(struct net_device *dev) { + struct i596_private *lp; + struct i596_rfd *rfd; + + lp = netdev_priv(dev); + lp->rx_tail->pa_next = I596_NULL; + + do { + rfd = pa_to_va(lp->scb.pa_rfd); + lp->scb.pa_rfd = rfd->pa_next; + kfree(rfd); + } while (rfd != lp->rx_tail); + + lp->rx_tail = NULL; + +#if 0 + for (lp->rbd_list) { + } +#endif +} + +#define PORT_RESET 0x00 /* reset 82596 */ +#define PORT_SELFTEST 0x01 /* selftest */ +#define PORT_ALTSCP 0x02 /* alternate SCB address */ +#define PORT_DUMP 0x03 /* dump */ + +#define IOADDR 0xcb0 /* real constant */ +#define IRQ 10 /* default IRQ - can be changed by ECU */ + +/* The 82596 requires two 16-bit write cycles for a port command */ +static inline void +PORT(phys_addr a, unsigned int cmd) { + if (a & 0xf) + printk("lp486e.c: PORT: address not aligned\n"); + outw(((a & 0xffff) | cmd), IOADDR); + outw(((a>>16) & 0xffff), IOADDR+2); +} + +static inline void +CA(void) { + outb(0, IOADDR+4); + udelay(8); +} + +static inline void +CLEAR_INT(void) { + outb(0, IOADDR+8); +} + +#if 0 +/* selftest or dump */ +static void +i596_port_do(struct net_device *dev, int portcmd, char *cmdname) { + struct i596_private *lp = netdev_priv(dev); + u16 *outp; + int i, m; + + memset((void *)&(lp->dump), 0, sizeof(struct i596_dump)); + outp = &(lp->dump.dump[0]); + + PORT(va_to_pa(outp), portcmd); + mdelay(30); /* random, unmotivated */ + + printk("lp486e i82596 %s result:\n", cmdname); + for (m = ARRAY_SIZE(lp->dump.dump); m && lp->dump.dump[m-1] == 0; m--) + ; + for (i = 0; i < m; i++) { + printk(" %04x", lp->dump.dump[i]); + if (i%8 == 7) + printk("\n"); + } + printk("\n"); +} +#endif + +static int +i596_scp_setup(struct net_device *dev) { + struct i596_private *lp = netdev_priv(dev); + int boguscnt; + + /* Setup SCP, ISCP, SCB */ + /* + * sysbus bits: + * only a single byte is significant - here 0x44 + * 0x80: big endian mode (details depend on stepping) + * 0x40: 1 + * 0x20: interrupt pin is active low + * 0x10: lock function disabled + * 0x08: external triggering of bus throttle timers + * 0x06: 00: 82586 compat mode, 01: segmented mode, 10: linear mode + * 0x01: unused + */ + lp->scp.sysbus = 0x00440000; /* linear mode */ + lp->scp.pad = 0; /* must be zero */ + lp->scp.pa_iscp = va_to_pa(&(lp->iscp)); + + /* + * The CPU sets the ISCP to 1 before it gives the first CA() + */ + lp->iscp.busy = 0x0001; + lp->iscp.pa_scb = va_to_pa(&(lp->scb)); + + lp->scb.command = 0; + lp->scb.status = 0; + lp->scb.pa_cmd = I596_NULL; + /* lp->scb.pa_rfd has been initialised already */ + + lp->last_cmd = jiffies; + lp->cmd_backlog = 0; + lp->cmd_head = NULL; + + /* + * Reset the 82596. + * We need to wait 10 systemclock cycles, and + * 5 serial clock cycles. + */ + PORT(0, PORT_RESET); /* address part ignored */ + udelay(100); + + /* + * Before the CA signal is asserted, the default SCP address + * (0x00fffff4) can be changed to a 16-byte aligned value + */ + PORT(va_to_pa(&lp->scp), PORT_ALTSCP); /* change the scp address */ + + /* + * The initialization procedure begins when a + * Channel Attention signal is asserted after a reset. + */ + + CA(); + + /* + * The ISCP busy is cleared by the 82596 after the SCB address is read. + */ + boguscnt = 100; + while (lp->iscp.busy) { + if (--boguscnt == 0) { + /* No i82596 present? */ + printk("%s: i82596 initialization timed out\n", + dev->name); + return 1; + } + udelay(5); + barrier(); + } + /* I find here boguscnt==100, so no delay was required. */ + + return 0; +} + +static int +init_i596(struct net_device *dev) { + struct i596_private *lp; + + if (i596_scp_setup(dev)) + return 1; + + lp = netdev_priv(dev); + lp->scb.command = 0; + + memcpy ((void *)lp->i596_config, init_setup, 14); + lp->set_conf.command = CmdConfigure; + i596_add_cmd(dev, (void *)&lp->set_conf); + + memcpy ((void *)lp->eth_addr, dev->dev_addr, 6); + lp->set_add.command = CmdIASetup; + i596_add_cmd(dev, (struct i596_cmd *)&lp->set_add); + + lp->tdr.command = CmdTDR; + i596_add_cmd(dev, (struct i596_cmd *)&lp->tdr); + + if (lp->scb.command && i596_timeout(dev, "i82596 init", 200)) + return 1; + + lp->scb.command = RX_START; + CA(); + + barrier(); + + if (lp->scb.command && i596_timeout(dev, "Receive Unit start", 100)) + return 1; + + return 0; +} + +/* Receive a single frame */ +static inline int +i596_rx_one(struct net_device *dev, struct i596_private *lp, + struct i596_rfd *rfd, int *frames) { + + if (rfd->stat & RFD_STAT_OK) { + /* a good frame */ + int pkt_len = (rfd->count & 0x3fff); + struct sk_buff *skb = dev_alloc_skb(pkt_len); + + (*frames)++; + + if (rfd->cmd & CMD_EOL) + printk("Received on EOL\n"); + + if (skb == NULL) { + printk ("%s: i596_rx Memory squeeze, " + "dropping packet.\n", dev->name); + dev->stats.rx_dropped++; + return 1; + } + + memcpy(skb_put(skb,pkt_len), rfd->data, pkt_len); + + skb->protocol = eth_type_trans(skb,dev); + netif_rx(skb); + dev->stats.rx_packets++; + } else { +#if 0 + printk("Frame reception error status %04x\n", + rfd->stat); +#endif + dev->stats.rx_errors++; + if (rfd->stat & RFD_COLLISION) + dev->stats.collisions++; + if (rfd->stat & RFD_SHORT_FRAME_ERR) + dev->stats.rx_length_errors++; + if (rfd->stat & RFD_DMA_ERR) + dev->stats.rx_over_errors++; + if (rfd->stat & RFD_NOBUFS_ERR) + dev->stats.rx_fifo_errors++; + if (rfd->stat & RFD_ALIGN_ERR) + dev->stats.rx_frame_errors++; + if (rfd->stat & RFD_CRC_ERR) + dev->stats.rx_crc_errors++; + if (rfd->stat & RFD_LENGTH_ERR) + dev->stats.rx_length_errors++; + } + rfd->stat = rfd->count = 0; + return 0; +} + +static int +i596_rx(struct net_device *dev) { + struct i596_private *lp = netdev_priv(dev); + struct i596_rfd *rfd; + int frames = 0; + + while (1) { + rfd = pa_to_va(lp->scb.pa_rfd); + if (!rfd) { + printk(KERN_ERR "i596_rx: NULL rfd?\n"); + return 0; + } +#if 1 + if (rfd->stat && !(rfd->stat & (RFD_STAT_C | RFD_STAT_B))) + printk("SF:%p-%04x\n", rfd, rfd->stat); +#endif + if (!(rfd->stat & RFD_STAT_C)) + break; /* next one not ready */ + if (i596_rx_one(dev, lp, rfd, &frames)) + break; /* out of memory */ + rfd->cmd = CMD_EOL; + lp->rx_tail->cmd = 0; + lp->rx_tail = rfd; + lp->scb.pa_rfd = rfd->pa_next; + barrier(); + } + + return frames; +} + +static void +i596_cleanup_cmd(struct net_device *dev) { + struct i596_private *lp; + struct i596_cmd *cmd; + + lp = netdev_priv(dev); + while (lp->cmd_head) { + cmd = (struct i596_cmd *)lp->cmd_head; + + lp->cmd_head = pa_to_va(lp->cmd_head->pa_next); + lp->cmd_backlog--; + + switch ((cmd->command) & 0x7) { + case CmdTx: { + struct tx_cmd *tx_cmd = (struct tx_cmd *) cmd; + struct i596_tbd * tx_cmd_tbd; + tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd); + + dev_kfree_skb_any(tx_cmd_tbd->skb); + + dev->stats.tx_errors++; + dev->stats.tx_aborted_errors++; + + cmd->pa_next = I596_NULL; + kfree((unsigned char *)tx_cmd); + netif_wake_queue(dev); + break; + } + case CmdMulticastList: { + // unsigned short count = *((unsigned short *) (ptr + 1)); + + cmd->pa_next = I596_NULL; + kfree((unsigned char *)cmd); + break; + } + default: { + cmd->pa_next = I596_NULL; + break; + } + } + barrier(); + } + + if (lp->scb.command && i596_timeout(dev, "i596_cleanup_cmd", 100)) + ; + + lp->scb.pa_cmd = va_to_pa(lp->cmd_head); +} + +static void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr) { + + if (lp->scb.command && i596_timeout(dev, "i596_reset", 100)) + ; + + netif_stop_queue(dev); + + lp->scb.command = CUC_ABORT | RX_ABORT; + CA(); + barrier(); + + /* wait for shutdown */ + if (lp->scb.command && i596_timeout(dev, "i596_reset(2)", 400)) + ; + + i596_cleanup_cmd(dev); + i596_rx(dev); + + netif_start_queue(dev); + /*dev_kfree_skb(skb, FREE_WRITE);*/ + init_i596(dev); +} + +static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd) { + struct i596_private *lp = netdev_priv(dev); + int ioaddr = dev->base_addr; + unsigned long flags; + + cmd->status = 0; + cmd->command |= (CMD_EOL | CMD_INTR); + cmd->pa_next = I596_NULL; + + spin_lock_irqsave(&lp->cmd_lock, flags); + + if (lp->cmd_head) { + lp->cmd_tail->pa_next = va_to_pa(cmd); + } else { + lp->cmd_head = cmd; + if (lp->scb.command && i596_timeout(dev, "i596_add_cmd", 100)) + ; + lp->scb.pa_cmd = va_to_pa(cmd); + lp->scb.command = CUC_START; + CA(); + } + lp->cmd_tail = cmd; + lp->cmd_backlog++; + + lp->cmd_head = pa_to_va(lp->scb.pa_cmd); + spin_unlock_irqrestore(&lp->cmd_lock, flags); + + if (lp->cmd_backlog > 16) { + int tickssofar = jiffies - lp->last_cmd; + if (tickssofar < HZ/4) + return; + + printk(KERN_WARNING "%s: command unit timed out, status resetting.\n", dev->name); + i596_reset(dev, lp, ioaddr); + } +} + +static int i596_open(struct net_device *dev) +{ + int i; + + i = request_irq(dev->irq, i596_interrupt, IRQF_SHARED, dev->name, dev); + if (i) { + printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq); + return i; + } + + if ((i = init_rx_bufs(dev, RX_RING_SIZE)) < RX_RING_SIZE) + printk(KERN_ERR "%s: only able to allocate %d receive buffers\n", dev->name, i); + + if (i < 4) { + free_irq(dev->irq, dev); + return -EAGAIN; + } + netif_start_queue(dev); + init_i596(dev); + return 0; /* Always succeed */ +} + +static netdev_tx_t i596_start_xmit (struct sk_buff *skb, struct net_device *dev) { + struct tx_cmd *tx_cmd; + short length; + + length = skb->len; + + if (length < ETH_ZLEN) { + if (skb_padto(skb, ETH_ZLEN)) + return NETDEV_TX_OK; + length = ETH_ZLEN; + } + + tx_cmd = kmalloc((sizeof (struct tx_cmd) + sizeof (struct i596_tbd)), GFP_ATOMIC); + if (tx_cmd == NULL) { + printk(KERN_WARNING "%s: i596_xmit Memory squeeze, dropping packet.\n", dev->name); + dev->stats.tx_dropped++; + dev_kfree_skb (skb); + } else { + struct i596_tbd *tx_cmd_tbd; + tx_cmd_tbd = (struct i596_tbd *) (tx_cmd + 1); + tx_cmd->pa_tbd = va_to_pa (tx_cmd_tbd); + tx_cmd_tbd->pa_next = I596_NULL; + + tx_cmd->cmd.command = (CMD_FLEX | CmdTx); + + tx_cmd->pad = 0; + tx_cmd->size = 0; + tx_cmd_tbd->pad = 0; + tx_cmd_tbd->size = (EOF | length); + + tx_cmd_tbd->pa_data = va_to_pa (skb->data); + tx_cmd_tbd->skb = skb; + + if (i596_debug & LOG_SRCDST) + print_eth (skb->data); + + i596_add_cmd (dev, (struct i596_cmd *) tx_cmd); + + dev->stats.tx_packets++; + } + + return NETDEV_TX_OK; +} + +static void +i596_tx_timeout (struct net_device *dev) { + struct i596_private *lp = netdev_priv(dev); + int ioaddr = dev->base_addr; + + /* Transmitter timeout, serious problems. */ + printk(KERN_WARNING "%s: transmit timed out, status resetting.\n", dev->name); + dev->stats.tx_errors++; + + /* Try to restart the adaptor */ + if (lp->last_restart == dev->stats.tx_packets) { + printk ("Resetting board.\n"); + + /* Shutdown and restart */ + i596_reset (dev, lp, ioaddr); + } else { + /* Issue a channel attention signal */ + printk ("Kicking board.\n"); + lp->scb.command = (CUC_START | RX_START); + CA(); + lp->last_restart = dev->stats.tx_packets; + } + netif_wake_queue(dev); +} + +static void print_eth(char *add) +{ + int i; + + printk ("Dest "); + for (i = 0; i < 6; i++) + printk(" %2.2X", (unsigned char) add[i]); + printk ("\n"); + + printk ("Source"); + for (i = 0; i < 6; i++) + printk(" %2.2X", (unsigned char) add[i+6]); + printk ("\n"); + + printk ("type %2.2X%2.2X\n", + (unsigned char) add[12], (unsigned char) add[13]); +} + +static const struct net_device_ops i596_netdev_ops = { + .ndo_open = i596_open, + .ndo_stop = i596_close, + .ndo_start_xmit = i596_start_xmit, + .ndo_set_rx_mode = set_multicast_list, + .ndo_tx_timeout = i596_tx_timeout, + .ndo_change_mtu = eth_change_mtu, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +static int __init lp486e_probe(struct net_device *dev) { + struct i596_private *lp; + unsigned char eth_addr[6] = { 0, 0xaa, 0, 0, 0, 0 }; + unsigned char *bios; + int i, j; + int ret = -ENOMEM; + static int probed; + + if (probed) + return -ENODEV; + probed++; + + if (!request_region(IOADDR, LP486E_TOTAL_SIZE, DRV_NAME)) { + printk(KERN_ERR "lp486e: IO address 0x%x in use\n", IOADDR); + return -EBUSY; + } + + lp = netdev_priv(dev); + spin_lock_init(&lp->cmd_lock); + + /* + * Do we really have this thing? + */ + if (i596_scp_setup(dev)) { + ret = -ENODEV; + goto err_out_kfree; + } + + dev->base_addr = IOADDR; + dev->irq = IRQ; + + + /* + * How do we find the ethernet address? I don't know. + * One possibility is to look at the EISA configuration area + * [0xe8000-0xe9fff]. This contains the ethernet address + * but not at a fixed address - things depend on setup options. + * + * If we find no address, or the wrong address, use + * ifconfig eth0 hw ether a1:a2:a3:a4:a5:a6 + * with the value found in the BIOS setup. + */ + bios = bus_to_virt(0xe8000); + for (j = 0; j < 0x2000; j++) { + if (bios[j] == 0 && bios[j+1] == 0xaa && bios[j+2] == 0) { + printk("%s: maybe address at BIOS 0x%x:", + dev->name, 0xe8000+j); + for (i = 0; i < 6; i++) { + eth_addr[i] = bios[i+j]; + printk(" %2.2X", eth_addr[i]); + } + printk("\n"); + } + } + + printk("%s: lp486e 82596 at %#3lx, IRQ %d,", + dev->name, dev->base_addr, dev->irq); + for (i = 0; i < 6; i++) + printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]); + printk("\n"); + + /* The LP486E-specific entries in the device structure. */ + dev->netdev_ops = &i596_netdev_ops; + dev->watchdog_timeo = 5*HZ; + +#if 0 + /* selftest reports 0x320925ae - don't know what that means */ + i596_port_do(dev, PORT_SELFTEST, "selftest"); + i596_port_do(dev, PORT_DUMP, "dump"); +#endif + return 0; + +err_out_kfree: + release_region(IOADDR, LP486E_TOTAL_SIZE); + return ret; +} + +static inline void +i596_handle_CU_completion(struct net_device *dev, + struct i596_private *lp, + unsigned short status, + unsigned short *ack_cmdp) { + struct i596_cmd *cmd; + int frames_out = 0; + int commands_done = 0; + int cmd_val; + unsigned long flags; + + spin_lock_irqsave(&lp->cmd_lock, flags); + cmd = lp->cmd_head; + + while (lp->cmd_head && (lp->cmd_head->status & CMD_STAT_C)) { + cmd = lp->cmd_head; + + lp->cmd_head = pa_to_va(lp->cmd_head->pa_next); + lp->cmd_backlog--; + + commands_done++; + cmd_val = cmd->command & 0x7; +#if 0 + printk("finished CU %s command (%d)\n", + CUcmdnames[cmd_val], cmd_val); +#endif + switch (cmd_val) { + case CmdTx: + { + struct tx_cmd *tx_cmd; + struct i596_tbd *tx_cmd_tbd; + + tx_cmd = (struct tx_cmd *) cmd; + tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd); + + frames_out++; + if (cmd->status & CMD_STAT_OK) { + if (i596_debug) + print_eth(pa_to_va(tx_cmd_tbd->pa_data)); + } else { + dev->stats.tx_errors++; + if (i596_debug) + printk("transmission failure:%04x\n", + cmd->status); + if (cmd->status & 0x0020) + dev->stats.collisions++; + if (!(cmd->status & 0x0040)) + dev->stats.tx_heartbeat_errors++; + if (cmd->status & 0x0400) + dev->stats.tx_carrier_errors++; + if (cmd->status & 0x0800) + dev->stats.collisions++; + if (cmd->status & 0x1000) + dev->stats.tx_aborted_errors++; + } + dev_kfree_skb_irq(tx_cmd_tbd->skb); + + cmd->pa_next = I596_NULL; + kfree((unsigned char *)tx_cmd); + netif_wake_queue(dev); + break; + } + + case CmdMulticastList: + cmd->pa_next = I596_NULL; + kfree((unsigned char *)cmd); + break; + + case CmdTDR: + { + unsigned long status = *((unsigned long *) (cmd + 1)); + if (status & 0x8000) { + if (i596_debug) + printk("%s: link ok.\n", dev->name); + } else { + if (status & 0x4000) + printk("%s: Transceiver problem.\n", + dev->name); + if (status & 0x2000) + printk("%s: Termination problem.\n", + dev->name); + if (status & 0x1000) + printk("%s: Short circuit.\n", + dev->name); + printk("%s: Time %ld.\n", + dev->name, status & 0x07ff); + } + } + default: + cmd->pa_next = I596_NULL; + lp->last_cmd = jiffies; + + } + barrier(); + } + + cmd = lp->cmd_head; + while (cmd && (cmd != lp->cmd_tail)) { + cmd->command &= 0x1fff; + cmd = pa_to_va(cmd->pa_next); + barrier(); + } + + if (lp->cmd_head) + *ack_cmdp |= CUC_START; + lp->scb.pa_cmd = va_to_pa(lp->cmd_head); + spin_unlock_irqrestore(&lp->cmd_lock, flags); +} + +static irqreturn_t +i596_interrupt(int irq, void *dev_instance) +{ + struct net_device *dev = dev_instance; + struct i596_private *lp = netdev_priv(dev); + unsigned short status, ack_cmd = 0; + int frames_in = 0; + + /* + * The 82596 examines the command, performs the required action, + * and then clears the SCB command word. + */ + if (lp->scb.command && i596_timeout(dev, "interrupt", 40)) + ; + + /* + * The status word indicates the status of the 82596. + * It is modified only by the 82596. + * + * [So, we must not clear it. I find often status 0xffff, + * which is not one of the values allowed by the docs.] + */ + status = lp->scb.status; +#if 0 + if (i596_debug) { + printk("%s: i596 interrupt, ", dev->name); + i596_out_status(status); + } +#endif + /* Impossible, but it happens - perhaps when we get + a receive interrupt but scb.pa_rfd is I596_NULL. */ + if (status == 0xffff) { + printk("%s: i596_interrupt: got status 0xffff\n", dev->name); + goto out; + } + + ack_cmd = (status & STAT_ACK); + + if (status & (STAT_CX | STAT_CNA)) + i596_handle_CU_completion(dev, lp, status, &ack_cmd); + + if (status & (STAT_FR | STAT_RNR)) { + /* Restart the receive unit when it got inactive somehow */ + if ((status & STAT_RNR) && netif_running(dev)) + ack_cmd |= RX_START; + + if (status & STAT_FR) { + frames_in = i596_rx(dev); + if (!frames_in) + printk("receive frame reported, but no frames\n"); + } + } + + /* acknowledge the interrupt */ + /* + if ((lp->scb.pa_cmd != I596_NULL) && netif_running(dev)) + ack_cmd |= CUC_START; + */ + + if (lp->scb.command && i596_timeout(dev, "i596 interrupt", 100)) + ; + + lp->scb.command = ack_cmd; + + CLEAR_INT(); + CA(); + + out: + return IRQ_HANDLED; +} + +static int i596_close(struct net_device *dev) { + struct i596_private *lp = netdev_priv(dev); + + netif_stop_queue(dev); + + if (i596_debug) + printk("%s: Shutting down ethercard, status was %4.4x.\n", + dev->name, lp->scb.status); + + lp->scb.command = (CUC_ABORT | RX_ABORT); + CA(); + + i596_cleanup_cmd(dev); + + if (lp->scb.command && i596_timeout(dev, "i596_close", 200)) + ; + + free_irq(dev->irq, dev); + remove_rx_bufs(dev); + + return 0; +} + +/* +* Set or clear the multicast filter for this adaptor. +*/ + +static void set_multicast_list(struct net_device *dev) { + struct i596_private *lp = netdev_priv(dev); + struct i596_cmd *cmd; + + if (i596_debug > 1) + printk ("%s: set multicast list %d\n", + dev->name, netdev_mc_count(dev)); + + if (!netdev_mc_empty(dev)) { + struct netdev_hw_addr *ha; + char *cp; + cmd = kmalloc(sizeof(struct i596_cmd) + 2 + + netdev_mc_count(dev) * 6, GFP_ATOMIC); + if (cmd == NULL) { + printk (KERN_ERR "%s: set_multicast Memory squeeze.\n", dev->name); + return; + } + cmd->command = CmdMulticastList; + *((unsigned short *) (cmd + 1)) = netdev_mc_count(dev) * 6; + cp = ((char *)(cmd + 1))+2; + netdev_for_each_mc_addr(ha, dev) { + memcpy(cp, ha->addr, 6); + cp += 6; + } + if (i596_debug & LOG_SRCDST) + print_eth (((char *)(cmd + 1)) + 2); + i596_add_cmd(dev, cmd); + } else { + if (lp->set_conf.pa_next != I596_NULL) { + return; + } + if (netdev_mc_empty(dev) && + !(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) { + lp->i596_config[8] &= ~0x01; + } else { + lp->i596_config[8] |= 0x01; + } + + i596_add_cmd(dev, (struct i596_cmd *) &lp->set_conf); + } +} + +MODULE_AUTHOR("Ard van Breemen <ard@cstmel.nl.eu.org>"); +MODULE_DESCRIPTION("Intel Panther onboard i82596 driver"); +MODULE_LICENSE("GPL"); + +static struct net_device *dev_lp486e; +static int full_duplex; +static int options; +static int io = IOADDR; +static int irq = IRQ; + +module_param(debug, int, 0); +//module_param(max_interrupt_work, int, 0); +//module_param(reverse_probe, int, 0); +//module_param(rx_copybreak, int, 0); +module_param(options, int, 0); +module_param(full_duplex, int, 0); + +static int __init lp486e_init_module(void) { + int err; + struct net_device *dev = alloc_etherdev(sizeof(struct i596_private)); + if (!dev) + return -ENOMEM; + + dev->irq = irq; + dev->base_addr = io; + err = lp486e_probe(dev); + if (err) { + free_netdev(dev); + return err; + } + err = register_netdev(dev); + if (err) { + release_region(dev->base_addr, LP486E_TOTAL_SIZE); + free_netdev(dev); + return err; + } + dev_lp486e = dev; + full_duplex = 0; + options = 0; + return 0; +} + +static void __exit lp486e_cleanup_module(void) { + unregister_netdev(dev_lp486e); + release_region(dev_lp486e->base_addr, LP486E_TOTAL_SIZE); + free_netdev(dev_lp486e); +} + +module_init(lp486e_init_module); +module_exit(lp486e_cleanup_module); |