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linux/drivers/net/hp.c
Joe Perches a4b770972b drivers/net: Remove unnecessary returns from void function()s 
This patch removes from drivers/net/ all the unnecessary
return; statements that precede the last closing brace of
void functions.

It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.

It also does not remove null void functions with return.

Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
  xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

with some cleanups by hand.

Compile tested x86 allmodconfig only.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-14 00:19:28 -07:00

439 lines
13 KiB
C
Raw Blame History

/* hp.c: A HP LAN ethernet driver for linux. */
/*
Written 1993-94 by Donald Becker.
Copyright 1993 United States Government as represented by the
Director, National Security Agency.
This software may be used and distributed according to the terms
of the GNU General Public License, 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
This is a driver for the HP PC-LAN adaptors.
Sources:
The Crynwr packet driver.
*/
static const char version[] =
"hp.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/system.h>
#include <asm/io.h>
#include "8390.h"
#define DRV_NAME "hp"
/* A zero-terminated list of I/O addresses to be probed. */
static unsigned int hppclan_portlist[] __initdata =
{ 0x300, 0x320, 0x340, 0x280, 0x2C0, 0x200, 0x240, 0};
#define HP_IO_EXTENT 32
#define HP_DATAPORT 0x0c /* "Remote DMA" data port. */
#define HP_ID 0x07
#define HP_CONFIGURE 0x08 /* Configuration register. */
#define HP_RUN 0x01 /* 1 == Run, 0 == reset. */
#define HP_IRQ 0x0E /* Mask for software-configured IRQ line. */
#define HP_DATAON 0x10 /* Turn on dataport */
#define NIC_OFFSET 0x10 /* Offset the 8390 registers. */
#define HP_START_PG 0x00 /* First page of TX buffer */
#define HP_8BSTOP_PG 0x80 /* Last page +1 of RX ring */
#define HP_16BSTOP_PG 0xFF /* Same, for 16 bit cards. */
static int hp_probe1(struct net_device *dev, int ioaddr);
static void hp_reset_8390(struct net_device *dev);
static void hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page);
static void hp_block_input(struct net_device *dev, int count,
struct sk_buff *skb , int ring_offset);
static void hp_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void hp_init_card(struct net_device *dev);
/* The map from IRQ number to HP_CONFIGURE register setting. */
/* My default is IRQ5 0 1 2 3 4 5 6 7 8 9 10 11 */
static char irqmap[16] __initdata= { 0, 0, 4, 6, 8,10, 0,14, 0, 4, 2,12,0,0,0,0};
/* Probe for an HP LAN adaptor.
Also initialize the card and fill in STATION_ADDR with the station
address. */
static int __init do_hp_probe(struct net_device *dev)
{
int i;
int base_addr = dev->base_addr;
int irq = dev->irq;
if (base_addr > 0x1ff) /* Check a single specified location. */
return hp_probe1(dev, base_addr);
else if (base_addr != 0) /* Don't probe at all. */
return -ENXIO;
for (i = 0; hppclan_portlist[i]; i++) {
if (hp_probe1(dev, hppclan_portlist[i]) == 0)
return 0;
dev->irq = irq;
}
return -ENODEV;
}
#ifndef MODULE
struct net_device * __init hp_probe(int unit)
{
struct net_device *dev = alloc_eip_netdev();
int err;
if (!dev)
return ERR_PTR(-ENOMEM);
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
err = do_hp_probe(dev);
if (err)
goto out;
return dev;
out:
free_netdev(dev);
return ERR_PTR(err);
}
#endif
static int __init hp_probe1(struct net_device *dev, int ioaddr)
{
int i, retval, board_id, wordmode;
const char *name;
static unsigned version_printed;
if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
return -EBUSY;
/* Check for the HP physical address, 08 00 09 xx xx xx. */
/* This really isn't good enough: we may pick up HP LANCE boards
also! Avoid the lance 0x5757 signature. */
if (inb(ioaddr) != 0x08
|| inb(ioaddr+1) != 0x00
|| inb(ioaddr+2) != 0x09
|| inb(ioaddr+14) == 0x57) {
retval = -ENODEV;
goto out;
}
/* Set up the parameters based on the board ID.
If you have additional mappings, please mail them to me -djb. */
if ((board_id = inb(ioaddr + HP_ID)) & 0x80) {
name = "HP27247";
wordmode = 1;
} else {
name = "HP27250";
wordmode = 0;
}
if (ei_debug && version_printed++ == 0)
printk(version);
printk("%s: %s (ID %02x) at %#3x,", dev->name, name, board_id, ioaddr);
for(i = 0; i < ETHER_ADDR_LEN; i++)
dev->dev_addr[i] = inb(ioaddr + i);
printk(" %pM", dev->dev_addr);
/* Snarf the interrupt now. Someday this could be moved to open(). */
if (dev->irq < 2) {
int irq_16list[] = { 11, 10, 5, 3, 4, 7, 9, 0};
int irq_8list[] = { 7, 5, 3, 4, 9, 0};
int *irqp = wordmode ? irq_16list : irq_8list;
do {
int irq = *irqp;
if (request_irq (irq, NULL, 0, "bogus", NULL) != -EBUSY) {
unsigned long cookie = probe_irq_on();
/* Twinkle the interrupt, and check if it's seen. */
outb_p(irqmap[irq] | HP_RUN, ioaddr + HP_CONFIGURE);
outb_p( 0x00 | HP_RUN, ioaddr + HP_CONFIGURE);
if (irq == probe_irq_off(cookie) /* It's a good IRQ line! */
&& request_irq (irq, eip_interrupt, 0, DRV_NAME, dev) == 0) {
printk(" selecting IRQ %d.\n", irq);
dev->irq = *irqp;
break;
}
}
} while (*++irqp);
if (*irqp == 0) {
printk(" no free IRQ lines.\n");
retval = -EBUSY;
goto out;
}
} else {
if (dev->irq == 2)
dev->irq = 9;
if ((retval = request_irq(dev->irq, eip_interrupt, 0, DRV_NAME, dev))) {
printk (" unable to get IRQ %d.\n", dev->irq);
goto out;
}
}
/* Set the base address to point to the NIC, not the "real" base! */
dev->base_addr = ioaddr + NIC_OFFSET;
dev->netdev_ops = &eip_netdev_ops;
ei_status.name = name;
ei_status.word16 = wordmode;
ei_status.tx_start_page = HP_START_PG;
ei_status.rx_start_page = HP_START_PG + TX_PAGES;
ei_status.stop_page = wordmode ? HP_16BSTOP_PG : HP_8BSTOP_PG;
ei_status.reset_8390 = &hp_reset_8390;
ei_status.get_8390_hdr = &hp_get_8390_hdr;
ei_status.block_input = &hp_block_input;
ei_status.block_output = &hp_block_output;
hp_init_card(dev);
retval = register_netdev(dev);
if (retval)
goto out1;
return 0;
out1:
free_irq(dev->irq, dev);
out:
release_region(ioaddr, HP_IO_EXTENT);
return retval;
}
static void
hp_reset_8390(struct net_device *dev)
{
int hp_base = dev->base_addr - NIC_OFFSET;
int saved_config = inb_p(hp_base + HP_CONFIGURE);
if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
outb_p(0x00, hp_base + HP_CONFIGURE);
ei_status.txing = 0;
/* Pause just a few cycles for the hardware reset to take place. */
udelay(5);
outb_p(saved_config, hp_base + HP_CONFIGURE);
udelay(5);
if ((inb_p(hp_base+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
printk("%s: hp_reset_8390() did not complete.\n", dev->name);
if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
}
static void
hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
{
int nic_base = dev->base_addr;
int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
outb_p(0, nic_base + EN0_RCNTHI);
outb_p(0, nic_base + EN0_RSARLO); /* On page boundary */
outb_p(ring_page, nic_base + EN0_RSARHI);
outb_p(E8390_RREAD+E8390_START, nic_base);
if (ei_status.word16)
insw(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
else
insb(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr));
outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
}
/* Block input and output, similar to the Crynwr packet driver. If you are
porting to a new ethercard look at the packet driver source for hints.
The HP LAN doesn't use shared memory -- we put the packet
out through the "remote DMA" dataport. */
static void
hp_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
int nic_base = dev->base_addr;
int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
int xfer_count = count;
char *buf = skb->data;
outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
outb_p(count & 0xff, nic_base + EN0_RCNTLO);
outb_p(count >> 8, nic_base + EN0_RCNTHI);
outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
outb_p(E8390_RREAD+E8390_START, nic_base);
if (ei_status.word16) {
insw(nic_base - NIC_OFFSET + HP_DATAPORT,buf,count>>1);
if (count & 0x01)
buf[count-1] = inb(nic_base - NIC_OFFSET + HP_DATAPORT), xfer_count++;
} else {
insb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
}
/* This is for the ALPHA version only, remove for later releases. */
if (ei_debug > 0) { /* DMA termination address check... */
int high = inb_p(nic_base + EN0_RSARHI);
int low = inb_p(nic_base + EN0_RSARLO);
int addr = (high << 8) + low;
/* Check only the lower 8 bits so we can ignore ring wrap. */
if (((ring_offset + xfer_count) & 0xff) != (addr & 0xff))
printk("%s: RX transfer address mismatch, %#4.4x vs. %#4.4x (actual).\n",
dev->name, ring_offset + xfer_count, addr);
}
outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
}
static void
hp_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
int nic_base = dev->base_addr;
int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
/* Round the count up for word writes. Do we need to do this?
What effect will an odd byte count have on the 8390?
I should check someday. */
if (ei_status.word16 && (count & 0x01))
count++;
/* We should already be in page 0, but to be safe... */
outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base);
#ifdef NE8390_RW_BUGFIX
/* Handle the read-before-write bug the same way as the
Crynwr packet driver -- the NatSemi method doesn't work. */
outb_p(0x42, nic_base + EN0_RCNTLO);
outb_p(0, nic_base + EN0_RCNTHI);
outb_p(0xff, nic_base + EN0_RSARLO);
outb_p(0x00, nic_base + EN0_RSARHI);
#define NE_CMD 0x00
outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
/* Make certain that the dummy read has occurred. */
inb_p(0x61);
inb_p(0x61);
#endif
outb_p(count & 0xff, nic_base + EN0_RCNTLO);
outb_p(count >> 8, nic_base + EN0_RCNTHI);
outb_p(0x00, nic_base + EN0_RSARLO);
outb_p(start_page, nic_base + EN0_RSARHI);
outb_p(E8390_RWRITE+E8390_START, nic_base);
if (ei_status.word16) {
/* Use the 'rep' sequence for 16 bit boards. */
outsw(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count>>1);
} else {
outsb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
}
/* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here -- it's broken! */
/* This is for the ALPHA version only, remove for later releases. */
if (ei_debug > 0) { /* DMA termination address check... */
int high = inb_p(nic_base + EN0_RSARHI);
int low = inb_p(nic_base + EN0_RSARLO);
int addr = (high << 8) + low;
if ((start_page << 8) + count != addr)
printk("%s: TX Transfer address mismatch, %#4.4x vs. %#4.4x.\n",
dev->name, (start_page << 8) + count, addr);
}
outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
}
/* This function resets the ethercard if something screws up. */
static void __init
hp_init_card(struct net_device *dev)
{
int irq = dev->irq;
NS8390p_init(dev, 0);
outb_p(irqmap[irq&0x0f] | HP_RUN,
dev->base_addr - NIC_OFFSET + HP_CONFIGURE);
}
#ifdef MODULE
#define MAX_HP_CARDS 4 /* Max number of HP cards per module */
static struct net_device *dev_hp[MAX_HP_CARDS];
static int io[MAX_HP_CARDS];
static int irq[MAX_HP_CARDS];
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(io, "I/O base address(es)");
MODULE_PARM_DESC(irq, "IRQ number(s) (assigned)");
MODULE_DESCRIPTION("HP PC-LAN ISA ethernet driver");
MODULE_LICENSE("GPL");
/* This is set up so that only a single autoprobe takes place per call.
ISA device autoprobes on a running machine are not recommended. */
int __init
init_module(void)
{
struct net_device *dev;
int this_dev, found = 0;
for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
if (io[this_dev] == 0) {
if (this_dev != 0) break; /* only autoprobe 1st one */
printk(KERN_NOTICE "hp.c: Presently autoprobing (not recommended) for a single card.\n");
}
dev = alloc_eip_netdev();
if (!dev)
break;
dev->irq = irq[this_dev];
dev->base_addr = io[this_dev];
if (do_hp_probe(dev) == 0) {
dev_hp[found++] = dev;
continue;
}
free_netdev(dev);
printk(KERN_WARNING "hp.c: No HP card found (i/o = 0x%x).\n", io[this_dev]);
break;
}
if (found)
return 0;
return -ENXIO;
}
static void cleanup_card(struct net_device *dev)
{
free_irq(dev->irq, dev);
release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
}
void __exit
cleanup_module(void)
{
int this_dev;
for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
struct net_device *dev = dev_hp[this_dev];
if (dev) {
unregister_netdev(dev);
cleanup_card(dev);
free_netdev(dev);
}
}
}
#endif /* MODULE */
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