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82596.c
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/* 82596.c: A generic 82596 ethernet driver for linux. */
/*
Based on Apricot.c
Written 1994 by Mark Evans.
This driver is for the Apricot 82596 bus-master interface
Modularised 12/94 Mark Evans
Modified to support the 82596 ethernet chips on 680x0 VME boards.
by Richard Hirst <[email protected]>
Renamed to be 82596.c
980825: Changed to receive directly in to sk_buffs which are
allocated at open() time. Eliminates copy on incoming frames
(small ones are still copied). Shared data now held in a
non-cached page, so we can run on 68060 in copyback mode.
TBD:
* look at deferring rx frames rather than discarding (as per tulip)
* handle tx ring full as per tulip
* performace test to tune rx_copybreak
Most of my modifications relate to the braindead big-endian
implementation by Intel. When the i596 is operating in
'big-endian' mode, it thinks a 32 bit value of 0x12345678
should be stored as 0x56781234. This is a real pain, when
you have linked lists which are shared by the 680x0 and the
i596.
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 [email protected], or C/O
Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
*/
#include <linux/config.h>
#include <linux/module.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/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/pgtable.h>
static char version[] __initdata =
"82596.c $Revision: 1.5 $\n";
#define DRV_NAME "82596"
/* DEBUG flags
*/
#define DEB_INIT 0x0001
#define DEB_PROBE 0x0002
#define DEB_SERIOUS 0x0004
#define DEB_ERRORS 0x0008
#define DEB_MULTI 0x0010
#define DEB_TDR 0x0020
#define DEB_OPEN 0x0040
#define DEB_RESET 0x0080
#define DEB_ADDCMD 0x0100
#define DEB_STATUS 0x0200
#define DEB_STARTTX 0x0400
#define DEB_RXADDR 0x0800
#define DEB_TXADDR 0x1000
#define DEB_RXFRAME 0x2000
#define DEB_INTS 0x4000
#define DEB_STRUCT 0x8000
#define DEB_ANY 0xffff
#define DEB(x,y) if (i596_debug & (x)) y
#if defined(CONFIG_MVME16x_NET) || defined(CONFIG_MVME16x_NET_MODULE)
#define ENABLE_MVME16x_NET
#endif
#if defined(CONFIG_BVME6000_NET) || defined(CONFIG_BVME6000_NET_MODULE)
#define ENABLE_BVME6000_NET
#endif
#if defined(CONFIG_APRICOT) || defined(CONFIG_APRICOT_MODULE)
#define ENABLE_APRICOT
#endif
#ifdef ENABLE_MVME16x_NET
#include <asm/mvme16xhw.h>
#endif
#ifdef ENABLE_BVME6000_NET
#include <asm/bvme6000hw.h>
#endif
/*
* Define various macros for Channel Attention, word swapping etc., dependent
* on architecture. MVME and BVME are 680x0 based, otherwise it is Intel.
*/
#ifdef __mc68000__
#define WSWAPrfd(x) ((struct i596_rfd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPrbd(x) ((struct i596_rbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPiscp(x) ((struct i596_iscp *)(((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPscb(x) ((struct i596_scb *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPcmd(x) ((struct i596_cmd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPtbd(x) ((struct i596_tbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPchar(x) ((char *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define ISCP_BUSY 0x00010000
#define MACH_IS_APRICOT 0
#else
#define WSWAPrfd(x) ((struct i596_rfd *)(x))
#define WSWAPrbd(x) ((struct i596_rbd *)(x))
#define WSWAPiscp(x) ((struct i596_iscp *)(x))
#define WSWAPscb(x) ((struct i596_scb *)(x))
#define WSWAPcmd(x) ((struct i596_cmd *)(x))
#define WSWAPtbd(x) ((struct i596_tbd *)(x))
#define WSWAPchar(x) ((char *)(x))
#define ISCP_BUSY 0x0001
#define MACH_IS_APRICOT 1
#endif
/*
* The MPU_PORT command allows direct access to the 82596. With PORT access
* the following commands are available (p5-18). The 32-bit port command
* must be word-swapped with the most significant word written first.
* This only applies to VME boards.
*/
#define PORT_RESET 0x00 /* reset 82596 */
#define PORT_SELFTEST 0x01 /* selftest */
#define PORT_ALTSCP 0x02 /* alternate SCB address */
#define PORT_ALTDUMP 0x03 /* Alternate DUMP address */
static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
MODULE_AUTHOR("Richard Hirst");
MODULE_DESCRIPTION("i82596 driver");
MODULE_LICENSE("GPL");
module_param(i596_debug, int, 0);
MODULE_PARM_DESC(i596_debug, "i82596 debug mask");
/* Copy frames shorter than rx_copybreak, otherwise pass on up in
* a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
*/
static int rx_copybreak = 100;
#define PKT_BUF_SZ 1536
#define MAX_MC_CNT 64
#define I596_TOTAL_SIZE 17
#define I596_NULL ((void *)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, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
};
#define STAT_C 0x8000 /* Set to 0 after execution */
#define STAT_B 0x4000 /* Command being executed */
#define STAT_OK 0x2000 /* Command executed ok */
#define STAT_A 0x1000 /* Command aborted */
#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
#define TX_TIMEOUT 5
struct i596_reg {
unsigned short porthi;
unsigned short portlo;
unsigned long ca;
};
#define EOF 0x8000
#define SIZE_MASK 0x3fff
struct i596_tbd {
unsigned short size;
unsigned short pad;
struct i596_tbd *next;
char *data;
};
/* The command structure has two 'next' pointers; v_next is the address of
* the next command as seen by the CPU, b_next is the address of the next
* command as seen by the 82596. The b_next pointer, as used by the 82596
* always references the status field of the next command, rather than the
* v_next field, because the 82596 is unaware of v_next. It may seem more
* logical to put v_next at the end of the structure, but we cannot do that
* because the 82596 expects other fields to be there, depending on command
* type.
*/
struct i596_cmd {
struct i596_cmd *v_next; /* Address from CPUs viewpoint */
unsigned short status;
unsigned short command;
struct i596_cmd *b_next; /* Address from i596 viewpoint */
};
struct tx_cmd {
struct i596_cmd cmd;
struct i596_tbd *tbd;
unsigned short size;
unsigned short pad;
struct sk_buff *skb; /* So we can free it after tx */
};
struct tdr_cmd {
struct i596_cmd cmd;
unsigned short status;
unsigned short pad;
};
struct mc_cmd {
struct i596_cmd cmd;
short mc_cnt;
char mc_addrs[MAX_MC_CNT*6];
};
struct sa_cmd {
struct i596_cmd cmd;
char eth_addr[8];
};
struct cf_cmd {
struct i596_cmd cmd;
char i596_config[16];
};
struct i596_rfd {
unsigned short stat;
unsigned short cmd;
struct i596_rfd *b_next; /* Address from i596 viewpoint */
struct i596_rbd *rbd;
unsigned short count;
unsigned short size;
struct i596_rfd *v_next; /* Address from CPUs viewpoint */
struct i596_rfd *v_prev;
};
struct i596_rbd {
unsigned short count;
unsigned short zero1;
struct i596_rbd *b_next;
unsigned char *b_data; /* Address from i596 viewpoint */
unsigned short size;
unsigned short zero2;
struct sk_buff *skb;
struct i596_rbd *v_next;
struct i596_rbd *b_addr; /* This rbd addr from i596 view */
unsigned char *v_data; /* Address from CPUs viewpoint */
};
#define TX_RING_SIZE 64
#define RX_RING_SIZE 16
struct i596_scb {
unsigned short status;
unsigned short command;
struct i596_cmd *cmd;
struct i596_rfd *rfd;
unsigned long crc_err;
unsigned long align_err;
unsigned long resource_err;
unsigned long over_err;
unsigned long rcvdt_err;
unsigned long short_err;
unsigned short t_on;
unsigned short t_off;
};
struct i596_iscp {
unsigned long stat;
struct i596_scb *scb;
};
struct i596_scp {
unsigned long sysbus;
unsigned long pad;
struct i596_iscp *iscp;
};
struct i596_private {
volatile struct i596_scp scp;
volatile struct i596_iscp iscp;
volatile struct i596_scb scb;
struct sa_cmd sa_cmd;
struct cf_cmd cf_cmd;
struct tdr_cmd tdr_cmd;
struct mc_cmd mc_cmd;
unsigned long stat;
int last_restart __attribute__((aligned(4)));
struct i596_rfd *rfd_head;
struct i596_rbd *rbd_head;
struct i596_cmd *cmd_tail;
struct i596_cmd *cmd_head;
int cmd_backlog;
unsigned long last_cmd;
struct net_device_stats stats;
struct i596_rfd rfds[RX_RING_SIZE];
struct i596_rbd rbds[RX_RING_SIZE];
struct tx_cmd tx_cmds[TX_RING_SIZE];
struct i596_tbd tbds[TX_RING_SIZE];
int next_tx_cmd;
spinlock_t lock;
};
static char init_setup[] =
{
0x8E, /* length, prefetch on */
0xC8, /* fifo to 8, monitor off */
#ifdef CONFIG_VME
0xc0, /* don't save bad frames */
#else
0x80, /* don't save bad frames */
#endif
0x2E, /* No source address insertion, 8 byte preamble */
0x00, /* priority and backoff defaults */
0x60, /* interframe spacing */
0x00, /* slot time LSB */
0xf2, /* slot time and retries */
0x00, /* promiscuous mode */
0x00, /* collision detect */
0x40, /* minimum frame length */
0xff,
0x00,
0x7f /* *multi IA */ };
static int i596_open(struct net_device *dev);
static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t i596_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int i596_close(struct net_device *dev);
static struct net_device_stats *i596_get_stats(struct net_device *dev);
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
static void i596_tx_timeout (struct net_device *dev);
static void print_eth(unsigned char *buf, char *str);
static void set_multicast_list(struct net_device *dev);
static int rx_ring_size = RX_RING_SIZE;
static int ticks_limit = 25;
static int max_cmd_backlog = TX_RING_SIZE-1;
static inline void CA(struct net_device *dev)
{
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x) {
((struct i596_reg *) dev->base_addr)->ca = 1;
}
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
volatile u32 i;
i = *(volatile u32 *) (dev->base_addr);
}
#endif
#ifdef ENABLE_APRICOT
if (MACH_IS_APRICOT) {
outw(0, (short) (dev->base_addr) + 4);
}
#endif
}
static inline void MPU_PORT(struct net_device *dev, int c, volatile void *x)
{
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x) {
struct i596_reg *p = (struct i596_reg *) (dev->base_addr);
p->porthi = ((c) | (u32) (x)) & 0xffff;
p->portlo = ((c) | (u32) (x)) >> 16;
}
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
u32 v = (u32) (c) | (u32) (x);
v = ((u32) (v) << 16) | ((u32) (v) >> 16);
*(volatile u32 *) dev->base_addr = v;
udelay(1);
*(volatile u32 *) dev->base_addr = v;
}
#endif
}
static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
while (--delcnt && lp->iscp.stat)
udelay(10);
if (!delcnt) {
printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
dev->name, str, lp->scb.status, lp->scb.command);
return -1;
}
else
return 0;
}
static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
while (--delcnt && lp->scb.command)
udelay(10);
if (!delcnt) {
printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
dev->name, str, lp->scb.status, lp->scb.command);
return -1;
}
else
return 0;
}
static inline int wait_cfg(struct net_device *dev, struct i596_cmd *cmd, int delcnt, char *str)
{
volatile struct i596_cmd *c = cmd;
while (--delcnt && c->command)
udelay(10);
if (!delcnt) {
printk(KERN_ERR "%s: %s.\n", dev->name, str);
return -1;
}
else
return 0;
}
static void i596_display_data(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
struct i596_cmd *cmd;
struct i596_rfd *rfd;
struct i596_rbd *rbd;
printk(KERN_ERR "lp and scp at %p, .sysbus = %08lx, .iscp = %p\n",
&lp->scp, lp->scp.sysbus, lp->scp.iscp);
printk(KERN_ERR "iscp at %p, iscp.stat = %08lx, .scb = %p\n",
&lp->iscp, lp->iscp.stat, lp->iscp.scb);
printk(KERN_ERR "scb at %p, scb.status = %04x, .command = %04x,"
" .cmd = %p, .rfd = %p\n",
&lp->scb, lp->scb.status, lp->scb.command,
lp->scb.cmd, lp->scb.rfd);
printk(KERN_ERR " errors: crc %lx, align %lx, resource %lx,"
" over %lx, rcvdt %lx, short %lx\n",
lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
cmd = lp->cmd_head;
while (cmd != I596_NULL) {
printk(KERN_ERR "cmd at %p, .status = %04x, .command = %04x, .b_next = %p\n",
cmd, cmd->status, cmd->command, cmd->b_next);
cmd = cmd->v_next;
}
rfd = lp->rfd_head;
printk(KERN_ERR "rfd_head = %p\n", rfd);
do {
printk(KERN_ERR " %p .stat %04x, .cmd %04x, b_next %p, rbd %p,"
" count %04x\n",
rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
rfd->count);
rfd = rfd->v_next;
} while (rfd != lp->rfd_head);
rbd = lp->rbd_head;
printk(KERN_ERR "rbd_head = %p\n", rbd);
do {
printk(KERN_ERR " %p .count %04x, b_next %p, b_data %p, size %04x\n",
rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
rbd = rbd->v_next;
} while (rbd != lp->rbd_head);
}
#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
static irqreturn_t i596_error(int irq, void *dev_id, struct pt_regs *regs)
{
struct net_device *dev = dev_id;
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x) {
volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
pcc2[0x28] = 1;
pcc2[0x2b] = 0x1d;
}
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
*ethirq = 1;
*ethirq = 3;
}
#endif
printk(KERN_ERR "%s: Error interrupt\n", dev->name);
i596_display_data(dev);
return IRQ_HANDLED;
}
#endif
static inline void init_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
int i;
struct i596_rfd *rfd;
struct i596_rbd *rbd;
/* First build the Receive Buffer Descriptor List */
for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ);
if (skb == NULL)
panic("82596: alloc_skb() failed");
skb->dev = dev;
rbd->v_next = rbd+1;
rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1));
rbd->b_addr = WSWAPrbd(virt_to_bus(rbd));
rbd->skb = skb;
rbd->v_data = skb->data;
rbd->b_data = WSWAPchar(virt_to_bus(skb->data));
rbd->size = PKT_BUF_SZ;
#ifdef __mc68000__
cache_clear(virt_to_phys(skb->data), PKT_BUF_SZ);
#endif
}
lp->rbd_head = lp->rbds;
rbd = lp->rbds + rx_ring_size - 1;
rbd->v_next = lp->rbds;
rbd->b_next = WSWAPrbd(virt_to_bus(lp->rbds));
/* Now build the Receive Frame Descriptor List */
for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
rfd->rbd = I596_NULL;
rfd->v_next = rfd+1;
rfd->v_prev = rfd-1;
rfd->b_next = WSWAPrfd(virt_to_bus(rfd+1));
rfd->cmd = CMD_FLEX;
}
lp->rfd_head = lp->rfds;
lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
rfd = lp->rfds;
rfd->rbd = lp->rbd_head;
rfd->v_prev = lp->rfds + rx_ring_size - 1;
rfd = lp->rfds + rx_ring_size - 1;
rfd->v_next = lp->rfds;
rfd->b_next = WSWAPrfd(virt_to_bus(lp->rfds));
rfd->cmd = CMD_EOL|CMD_FLEX;
}
static inline void remove_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
struct i596_rbd *rbd;
int i;
for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
if (rbd->skb == NULL)
break;
dev_kfree_skb(rbd->skb);
}
}
static void rebuild_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
int i;
/* Ensure rx frame/buffer descriptors are tidy */
for (i = 0; i < rx_ring_size; i++) {
lp->rfds[i].rbd = I596_NULL;
lp->rfds[i].cmd = CMD_FLEX;
}
lp->rfds[rx_ring_size-1].cmd = CMD_EOL|CMD_FLEX;
lp->rfd_head = lp->rfds;
lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
lp->rbd_head = lp->rbds;
lp->rfds[0].rbd = WSWAPrbd(virt_to_bus(lp->rbds));
}
static int init_i596_mem(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
#if !defined(ENABLE_MVME16x_NET) && !defined(ENABLE_BVME6000_NET)
short ioaddr = dev->base_addr;
#endif
unsigned long flags;
MPU_PORT(dev, PORT_RESET, NULL);
udelay(100); /* Wait 100us - seems to help */
#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x) {
volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
/* Disable all ints for now */
pcc2[0x28] = 1;
pcc2[0x2a] = 0x48;
/* Following disables snooping. Snooping is not required
* as we make appropriate use of non-cached pages for
* shared data, and cache_push/cache_clear.
*/
pcc2[0x2b] = 0x08;
}
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
*ethirq = 1;
}
#endif
/* change the scp address */
MPU_PORT(dev, PORT_ALTSCP, (void *)virt_to_bus((void *)&lp->scp));
#elif defined(ENABLE_APRICOT)
{
u32 scp = virt_to_bus(&lp->scp);
/* change the scp address */
outw(0, ioaddr);
outw(0, ioaddr);
outb(4, ioaddr + 0xf);
outw(scp | 2, ioaddr);
outw(scp >> 16, ioaddr);
}
#endif
lp->last_cmd = jiffies;
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x)
lp->scp.sysbus = 0x00000054;
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000)
lp->scp.sysbus = 0x0000004c;
#endif
#ifdef ENABLE_APRICOT
if (MACH_IS_APRICOT)
lp->scp.sysbus = 0x00440000;
#endif
lp->scp.iscp = WSWAPiscp(virt_to_bus((void *)&lp->iscp));
lp->iscp.scb = WSWAPscb(virt_to_bus((void *)&lp->scb));
lp->iscp.stat = ISCP_BUSY;
lp->cmd_backlog = 0;
lp->cmd_head = lp->scb.cmd = I596_NULL;
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
lp->scb.t_on = 7 * 25;
lp->scb.t_off = 1 * 25;
}
#endif
DEB(DEB_INIT,printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
#if defined(ENABLE_APRICOT)
(void) inb(ioaddr + 0x10);
outb(4, ioaddr + 0xf);
#endif
CA(dev);
if (wait_istat(dev,lp,1000,"initialization timed out"))
goto failed;
DEB(DEB_INIT,printk(KERN_DEBUG "%s: i82596 initialization successful\n", dev->name));
/* Ensure rx frame/buffer descriptors are tidy */
rebuild_rx_bufs(dev);
lp->scb.command = 0;
#ifdef ENABLE_MVME16x_NET
if (MACH_IS_MVME16x) {
volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
/* Enable ints, etc. now */
pcc2[0x2a] = 0x55; /* Edge sensitive */
pcc2[0x2b] = 0x15;
}
#endif
#ifdef ENABLE_BVME6000_NET
if (MACH_IS_BVME6000) {
volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
*ethirq = 3;
}
#endif
DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdConfigure\n", dev->name));
memcpy(lp->cf_cmd.i596_config, init_setup, 14);
lp->cf_cmd.cmd.command = CmdConfigure;
i596_add_cmd(dev, &lp->cf_cmd.cmd);
DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
memcpy(lp->sa_cmd.eth_addr, dev->dev_addr, 6);
lp->sa_cmd.cmd.command = CmdSASetup;
i596_add_cmd(dev, &lp->sa_cmd.cmd);
DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
lp->tdr_cmd.cmd.command = CmdTDR;
i596_add_cmd(dev, &lp->tdr_cmd.cmd);
spin_lock_irqsave (&lp->lock, flags);
if (wait_cmd(dev,lp,1000,"timed out waiting to issue RX_START")) {
spin_unlock_irqrestore (&lp->lock, flags);
goto failed;
}
DEB(DEB_INIT,printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
lp->scb.command = RX_START;
CA(dev);
spin_unlock_irqrestore (&lp->lock, flags);
if (wait_cmd(dev,lp,1000,"RX_START not processed"))
goto failed;
DEB(DEB_INIT,printk(KERN_DEBUG "%s: Receive unit started OK\n", dev->name));
return 0;
failed:
printk(KERN_CRIT "%s: Failed to initialise 82596\n", dev->name);
MPU_PORT(dev, PORT_RESET, NULL);
return -1;
}
static inline int i596_rx(struct net_device *dev)
{
struct i596_private *lp = dev->priv;
struct i596_rfd *rfd;
struct i596_rbd *rbd;
int frames = 0;
DEB(DEB_RXFRAME,printk(KERN_DEBUG "i596_rx(), rfd_head %p, rbd_head %p\n",
lp->rfd_head, lp->rbd_head));
rfd = lp->rfd_head; /* Ref next frame to check */
while ((rfd->stat) & STAT_C) { /* Loop while complete frames */
if (rfd->rbd == I596_NULL)
rbd = I596_NULL;
else if (rfd->rbd == lp->rbd_head->b_addr)
rbd = lp->rbd_head;
else {
printk(KERN_CRIT "%s: rbd chain broken!\n", dev->name);
/* XXX Now what? */
rbd = I596_NULL;
}
DEB(DEB_RXFRAME, printk(KERN_DEBUG " rfd %p, rfd.rbd %p, rfd.stat %04x\n",
rfd, rfd->rbd, rfd->stat));
if (rbd != I596_NULL && ((rfd->stat) & STAT_OK)) {
/* a good frame */
int pkt_len = rbd->count & 0x3fff;
struct sk_buff *skb = rbd->skb;
int rx_in_place = 0;
DEB(DEB_RXADDR,print_eth(rbd->v_data, "received"));
frames++;
/* Check if the packet is long enough to just accept
* without copying to a properly sized skbuff.
*/
if (pkt_len > rx_copybreak) {
struct sk_buff *newskb;
/* Get fresh skbuff to replace filled one. */
newskb = dev_alloc_skb(PKT_BUF_SZ);
if (newskb == NULL) {
skb = NULL; /* drop pkt */
goto memory_squeeze;
}
/* Pass up the skb already on the Rx ring. */
skb_put(skb, pkt_len);
rx_in_place = 1;
rbd->skb = newskb;
newskb->dev = dev;
rbd->v_data = newskb->data;
rbd->b_data = WSWAPchar(virt_to_bus(newskb->data));
#ifdef __mc68000__
cache_clear(virt_to_phys(newskb->data), PKT_BUF_SZ);
#endif
}
else
skb = dev_alloc_skb(pkt_len + 2);
memory_squeeze:
if (skb == NULL) {
/* XXX tulip.c can defer packets here!! */
printk(KERN_WARNING "%s: i596_rx Memory squeeze, dropping packet.\n", dev->name);
lp->stats.rx_dropped++;
}
else {
skb->dev = dev;
if (!rx_in_place) {
/* 16 byte align the data fields */
skb_reserve(skb, 2);
memcpy(skb_put(skb,pkt_len), rbd->v_data, pkt_len);
}
skb->protocol=eth_type_trans(skb,dev);
skb->len = pkt_len;
#ifdef __mc68000__
cache_clear(virt_to_phys(rbd->skb->data),
pkt_len);
#endif
netif_rx(skb);
dev->last_rx = jiffies;
lp->stats.rx_packets++;
lp->stats.rx_bytes+=pkt_len;
}
}
else {
DEB(DEB_ERRORS, printk(KERN_DEBUG "%s: Error, rfd.stat = 0x%04x\n",
dev->name, rfd->stat));
lp->stats.rx_errors++;
if ((rfd->stat) & 0x0001)
lp->stats.collisions++;
if ((rfd->stat) & 0x0080)
lp->stats.rx_length_errors++;
if ((rfd->stat) & 0x0100)
lp->stats.rx_over_errors++;
if ((rfd->stat) & 0x0200)
lp->stats.rx_fifo_errors++;
if ((rfd->stat) & 0x0400)
lp->stats.rx_frame_errors++;
if ((rfd->stat) & 0x0800)
lp->stats.rx_crc_errors++;
if ((rfd->stat) & 0x1000)
lp->stats.rx_length_errors++;
}
/* Clear the buffer descriptor count and EOF + F flags */
if (rbd != I596_NULL && (rbd->count & 0x4000)) {
rbd->count = 0;
lp->rbd_head = rbd->v_next;
}
/* Tidy the frame descriptor, marking it as end of list */
rfd->rbd = I596_NULL;
rfd->stat = 0;
rfd->cmd = CMD_EOL|CMD_FLEX;
rfd->count = 0;
/* Remove end-of-list from old end descriptor */
rfd->v_prev->cmd = CMD_FLEX;
/* Update record of next frame descriptor to process */
lp->scb.rfd = rfd->b_next;
lp->rfd_head = rfd->v_next;
rfd = lp->rfd_head;
}
DEB(DEB_RXFRAME,printk(KERN_DEBUG "frames %d\n", frames));
return 0;
}
static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
{
struct i596_cmd *ptr;
while (lp->cmd_head != I596_NULL) {
ptr = lp->cmd_head;
lp->cmd_head = ptr->v_next;
lp->cmd_backlog--;
switch ((ptr->command) & 0x7) {
case CmdTx:
{
struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
struct sk_buff *skb = tx_cmd->skb;
dev_kfree_skb(skb);
lp->stats.tx_errors++;
lp->stats.tx_aborted_errors++;
ptr->v_next = ptr->b_next = I596_NULL;
tx_cmd->cmd.command = 0; /* Mark as free */
break;
}
default:
ptr->v_next = ptr->b_next = I596_NULL;
}
}
wait_cmd(dev,lp,100,"i596_cleanup_cmd timed out");
lp->scb.cmd = I596_NULL;
}
static inline void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr)
{
unsigned long flags;
DEB(DEB_RESET,printk(KERN_DEBUG "i596_reset\n"));
spin_lock_irqsave (&lp->lock, flags);
wait_cmd(dev,lp,100,"i596_reset timed out");
netif_stop_queue(dev);
lp->scb.command = CUC_ABORT | RX_ABORT;
CA(dev);
/* wait for shutdown */
wait_cmd(dev,lp,1000,"i596_reset 2 timed out");
spin_unlock_irqrestore (&lp->lock, flags);
i596_cleanup_cmd(dev,lp);
i596_rx(dev);
netif_start_queue(dev);
init_i596_mem(dev);
}
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
{
struct i596_private *lp = dev->priv;
int ioaddr = dev->base_addr;
unsigned long flags;
DEB(DEB_ADDCMD,printk(KERN_DEBUG "i596_add_cmd\n"));
cmd->status = 0;
cmd->command |= (CMD_EOL | CMD_INTR);
cmd->v_next = cmd->b_next = I596_NULL;
spin_lock_irqsave (&lp->lock, flags);
if (lp->cmd_head != I596_NULL) {
lp->cmd_tail->v_next = cmd;
lp->cmd_tail->b_next = WSWAPcmd(virt_to_bus(&cmd->status));
} else {
lp->cmd_head = cmd;
wait_cmd(dev,lp,100,"i596_add_cmd timed out");
lp->scb.cmd = WSWAPcmd(virt_to_bus(&cmd->status));
lp->scb.command = CUC_START;
CA(dev);
}
lp->cmd_tail = cmd;
lp->cmd_backlog++;
spin_unlock_irqrestore (&lp->lock, flags);
if (lp->cmd_backlog > max_cmd_backlog) {
unsigned long tickssofar = jiffies - lp->last_cmd;
if (tickssofar < ticks_limit)
return;
printk(KERN_NOTICE "%s: command unit timed out, status resetting.\n", dev->name);
i596_reset(dev, lp, ioaddr);
}