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linux-loongson/drivers/net/hp-plus.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

506 lines
15 KiB
C
Raw Blame History

/* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
/*
Written 1994 by Donald Becker.
This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
These cards are sold under several model numbers, usually 2724*.
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
As is often the case, a great deal of credit is owed to Russ Nelson.
The Crynwr packet driver was my primary source of HP-specific
programming information.
*/
static const char version[] =
"hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
#include <linux/module.h>
#include <linux/string.h> /* Important -- this inlines word moves. */
#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-plus"
/* A zero-terminated list of I/O addresses to be probed. */
static unsigned int hpplus_portlist[] __initdata =
{0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
/*
The HP EtherTwist chip implementation is a fairly routine DP8390
implementation. It allows both shared memory and programmed-I/O buffer
access, using a custom interface for both. The programmed-I/O mode is
entirely implemented in the HP EtherTwist chip, bypassing the problem
ridden built-in 8390 facilities used on NE2000 designs. The shared
memory mode is likewise special, with an offset register used to make
packets appear at the shared memory base. Both modes use a base and bounds
page register to hide the Rx ring buffer wrap -- a packet that spans the
end of physical buffer memory appears continuous to the driver. (c.f. the
3c503 and Cabletron E2100)
A special note: the internal buffer of the board is only 8 bits wide.
This lays several nasty traps for the unaware:
- the 8390 must be programmed for byte-wide operations
- all I/O and memory operations must work on whole words (the access
latches are serially preloaded and have no byte-swapping ability).
This board is laid out in I/O space much like the earlier HP boards:
the first 16 locations are for the board registers, and the second 16 are
for the 8390. The board is easy to identify, with both a dedicated 16 bit
ID register and a constant 0x530* value in the upper bits of the paging
register.
*/
#define HP_ID 0x00 /* ID register, always 0x4850. */
#define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
#define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
#define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
#define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
#define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
#define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
#define HP_IO_EXTENT 32
#define HP_START_PG 0x00 /* First page of TX buffer */
#define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
/* The register set selected in HP_PAGING. */
enum PageName {
Perf_Page = 0, /* Normal operation. */
MAC_Page = 1, /* The ethernet address (+checksum). */
HW_Page = 2, /* EEPROM-loaded hardware parameters. */
LAN_Page = 4, /* Transceiver selection, testing, etc. */
ID_Page = 6 };
/* The bit definitions for the HPP_OPTION register. */
enum HP_Option {
NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
static int hpp_probe1(struct net_device *dev, int ioaddr);
static void hpp_reset_8390(struct net_device *dev);
static int hpp_open(struct net_device *dev);
static int hpp_close(struct net_device *dev);
static void hpp_mem_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void hpp_mem_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page);
static void hpp_io_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void hpp_io_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page);
/* Probe a list of addresses for an HP LAN+ adaptor.
This routine is almost boilerplate. */
static int __init do_hpp_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 hpp_probe1(dev, base_addr);
else if (base_addr != 0) /* Don't probe at all. */
return -ENXIO;
for (i = 0; hpplus_portlist[i]; i++) {
if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
return 0;
dev->irq = irq;
}
return -ENODEV;
}
#ifndef MODULE
struct net_device * __init hp_plus_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_hpp_probe(dev);
if (err)
goto out;
return dev;
out:
free_netdev(dev);
return ERR_PTR(err);
}
#endif
static const struct net_device_ops hpp_netdev_ops = {
.ndo_open = hpp_open,
.ndo_stop = hpp_close,
.ndo_start_xmit = eip_start_xmit,
.ndo_tx_timeout = eip_tx_timeout,
.ndo_get_stats = eip_get_stats,
.ndo_set_multicast_list = eip_set_multicast_list,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
.ndo_change_mtu = eth_change_mtu,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = eip_poll,
#endif
};
/* Do the interesting part of the probe at a single address. */
static int __init hpp_probe1(struct net_device *dev, int ioaddr)
{
int i, retval;
unsigned char checksum = 0;
const char name[] = "HP-PC-LAN+";
int mem_start;
static unsigned version_printed;
if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
return -EBUSY;
/* Check for the HP+ signature, 50 48 0x 53. */
if (inw(ioaddr + HP_ID) != 0x4850 ||
(inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
retval = -ENODEV;
goto out;
}
if (ei_debug && version_printed++ == 0)
printk(version);
printk("%s: %s at %#3x, ", dev->name, name, ioaddr);
/* Retrieve and checksum the station address. */
outw(MAC_Page, ioaddr + HP_PAGING);
for(i = 0; i < ETHER_ADDR_LEN; i++) {
unsigned char inval = inb(ioaddr + 8 + i);
dev->dev_addr[i] = inval;
checksum += inval;
}
checksum += inb(ioaddr + 14);
printk("%pM", dev->dev_addr);
if (checksum != 0xff) {
printk(" bad checksum %2.2x.\n", checksum);
retval = -ENODEV;
goto out;
} else {
/* Point at the Software Configuration Flags. */
outw(ID_Page, ioaddr + HP_PAGING);
printk(" ID %4.4x", inw(ioaddr + 12));
}
/* Read the IRQ line. */
outw(HW_Page, ioaddr + HP_PAGING);
{
int irq = inb(ioaddr + 13) & 0x0f;
int option = inw(ioaddr + HPP_OPTION);
dev->irq = irq;
if (option & MemEnable) {
mem_start = inw(ioaddr + 9) << 8;
printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
} else {
mem_start = 0;
printk(", IRQ %d, programmed-I/O mode.\n", irq);
}
}
/* Set the wrap registers for string I/O reads. */
outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
/* Set the base address to point to the NIC, not the "real" base! */
dev->base_addr = ioaddr + NIC_OFFSET;
dev->netdev_ops = &hpp_netdev_ops;
ei_status.name = name;
ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
ei_status.tx_start_page = HP_START_PG;
ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
ei_status.stop_page = HP_STOP_PG;
ei_status.reset_8390 = &hpp_reset_8390;
ei_status.block_input = &hpp_io_block_input;
ei_status.block_output = &hpp_io_block_output;
ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
/* Check if the memory_enable flag is set in the option register. */
if (mem_start) {
ei_status.block_input = &hpp_mem_block_input;
ei_status.block_output = &hpp_mem_block_output;
ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
dev->mem_start = mem_start;
ei_status.mem = ioremap(mem_start,
(HP_STOP_PG - HP_START_PG)*256);
if (!ei_status.mem) {
retval = -ENOMEM;
goto out;
}
ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
dev->mem_end = ei_status.rmem_end
= dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
}
outw(Perf_Page, ioaddr + HP_PAGING);
NS8390p_init(dev, 0);
/* Leave the 8390 and HP chip reset. */
outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
retval = register_netdev(dev);
if (retval)
goto out1;
return 0;
out1:
iounmap(ei_status.mem);
out:
release_region(ioaddr, HP_IO_EXTENT);
return retval;
}
static int
hpp_open(struct net_device *dev)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg;
int retval;
if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
return retval;
}
/* Reset the 8390 and HP chip. */
option_reg = inw(ioaddr + HPP_OPTION);
outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
udelay(5);
/* Unreset the board and enable interrupts. */
outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
/* Set the wrap registers for programmed-I/O operation. */
outw(HW_Page, ioaddr + HP_PAGING);
outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
/* Select the operational page. */
outw(Perf_Page, ioaddr + HP_PAGING);
return eip_open(dev);
}
static int
hpp_close(struct net_device *dev)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg = inw(ioaddr + HPP_OPTION);
free_irq(dev->irq, dev);
eip_close(dev);
outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
ioaddr + HPP_OPTION);
return 0;
}
static void
hpp_reset_8390(struct net_device *dev)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg = inw(ioaddr + HPP_OPTION);
if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
/* Pause a few cycles for the hardware reset to take place. */
udelay(5);
ei_status.txing = 0;
outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
udelay(5);
if ((inb_p(ioaddr+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);
}
/* The programmed-I/O version of reading the 4 byte 8390 specific header.
Note that transfer with the EtherTwist+ must be on word boundaries. */
static void
hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
}
/* Block input and output, similar to the Crynwr packet driver. */
static void
hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
char *buf = skb->data;
outw(ring_offset, ioaddr + HPP_IN_ADDR);
insw(ioaddr + HP_DATAPORT, buf, count>>1);
if (count & 0x01)
buf[count-1] = inw(ioaddr + HP_DATAPORT);
}
/* The corresponding shared memory versions of the above 2 functions. */
static void
hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg = inw(ioaddr + HPP_OPTION);
outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
outw(option_reg, ioaddr + HPP_OPTION);
hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
}
static void
hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg = inw(ioaddr + HPP_OPTION);
outw(ring_offset, ioaddr + HPP_IN_ADDR);
outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
/* Caution: this relies on get_8390_hdr() rounding up count!
Also note that we *can't* use eth_io_copy_and_sum() because
it will not always copy "count" bytes (e.g. padded IP). */
memcpy_fromio(skb->data, ei_status.mem, count);
outw(option_reg, ioaddr + HPP_OPTION);
}
/* A special note: we *must* always transfer >=16 bit words.
It's always safe to round up, so we do. */
static void
hpp_io_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
}
static void
hpp_mem_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
int ioaddr = dev->base_addr - NIC_OFFSET;
int option_reg = inw(ioaddr + HPP_OPTION);
outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
outw(option_reg, ioaddr + HPP_OPTION);
}
#ifdef MODULE
#define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
static struct net_device *dev_hpp[MAX_HPP_CARDS];
static int io[MAX_HPP_CARDS];
static int irq[MAX_HPP_CARDS];
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(io, "I/O port address(es)");
MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
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_HPP_CARDS; this_dev++) {
if (io[this_dev] == 0) {
if (this_dev != 0) break; /* only autoprobe 1st one */
printk(KERN_NOTICE "hp-plus.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_hpp_probe(dev) == 0) {
dev_hpp[found++] = dev;
continue;
}
free_netdev(dev);
printk(KERN_WARNING "hp-plus.c: No HP-Plus 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)
{
/* NB: hpp_close() handles free_irq */
iounmap(ei_status.mem);
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_HPP_CARDS; this_dev++) {
struct net_device *dev = dev_hpp[this_dev];
if (dev) {
unregister_netdev(dev);
cleanup_card(dev);
free_netdev(dev);
}
}
}
#endif /* MODULE */
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