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linux/drivers/net/hydra.c
Bjorn Helgaas 33d8675ea6 [PATCH] amiga: fix driver_register() return handling, remove zorro_module_init() 
Remove the assumption that driver_register() returns the number of devices
bound to the driver.  In fact, it returns zero for success or a negative
error value.

zorro_module_init() used the device count to automatically unregister and
unload drivers that found no devices.  That might have worked at one time,
but has been broken for some time because zorro_register_driver() returned
either a negative error or a positive count (never zero).  So it could only
unregister on failure, when it's not needed anyway.

This functionality could be resurrected in individual drivers by counting
devices in their .probe() methods.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:53 -08:00

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/* New Hydra driver using generic 8390 core */
/* Based on old hydra driver by Topi Kanerva (topi@susanna.oulu.fi) */
/* This file is subject to the terms and conditions of the GNU General */
/* Public License. See the file COPYING in the main directory of the */
/* Linux distribution for more details. */
/* Peter De Schrijver (p2@mind.be) */
/* Oldenburg 2000 */
/* The Amiganet is a Zorro-II board made by Hydra Systems. It contains a */
/* NS8390 NIC (network interface controller) clone, 16 or 64K on-board RAM */
/* and 10BASE-2 (thin coax) and AUI connectors. */
#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/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <linux/zorro.h>
#include "8390.h"
#define NE_EN0_DCFG (0x0e*2)
#define NESM_START_PG 0x0 /* First page of TX buffer */
#define NESM_STOP_PG 0x40 /* Last page +1 of RX ring */
#define HYDRA_NIC_BASE 0xffe1
#define HYDRA_ADDRPROM 0xffc0
#define HYDRA_VERSION "v3.0alpha"
#define WORDSWAP(a) ((((a)>>8)&0xff) | ((a)<<8))
static int __devinit hydra_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent);
static int __devinit hydra_init(struct zorro_dev *z);
static int hydra_open(struct net_device *dev);
static int hydra_close(struct net_device *dev);
static void hydra_reset_8390(struct net_device *dev);
static void hydra_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page);
static void hydra_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void hydra_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void __devexit hydra_remove_one(struct zorro_dev *z);
static struct zorro_device_id hydra_zorro_tbl[] __devinitdata = {
{ ZORRO_PROD_HYDRA_SYSTEMS_AMIGANET },
{ 0 }
};
static struct zorro_driver hydra_driver = {
.name = "hydra",
.id_table = hydra_zorro_tbl,
.probe = hydra_init_one,
.remove = __devexit_p(hydra_remove_one),
};
static int __devinit hydra_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent)
{
int err;
if (!request_mem_region(z->resource.start, 0x10000, "Hydra"))
return -EBUSY;
if ((err = hydra_init(z))) {
release_mem_region(z->resource.start, 0x10000);
return -EBUSY;
}
return 0;
}
static int __devinit hydra_init(struct zorro_dev *z)
{
struct net_device *dev;
unsigned long board = ZTWO_VADDR(z->resource.start);
unsigned long ioaddr = board+HYDRA_NIC_BASE;
const char name[] = "NE2000";
int start_page, stop_page;
int j;
int err;
static u32 hydra_offsets[16] = {
0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e,
0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
};
dev = alloc_ei_netdev();
if (!dev)
return -ENOMEM;
SET_MODULE_OWNER(dev);
for(j = 0; j < ETHER_ADDR_LEN; j++)
dev->dev_addr[j] = *((u8 *)(board + HYDRA_ADDRPROM + 2*j));
/* We must set the 8390 for word mode. */
z_writeb(0x4b, ioaddr + NE_EN0_DCFG);
start_page = NESM_START_PG;
stop_page = NESM_STOP_PG;
dev->base_addr = ioaddr;
dev->irq = IRQ_AMIGA_PORTS;
/* Install the Interrupt handler */
if (request_irq(IRQ_AMIGA_PORTS, ei_interrupt, SA_SHIRQ, "Hydra Ethernet",
dev)) {
free_netdev(dev);
return -EAGAIN;
}
ei_status.name = name;
ei_status.tx_start_page = start_page;
ei_status.stop_page = stop_page;
ei_status.word16 = 1;
ei_status.bigendian = 1;
ei_status.rx_start_page = start_page + TX_PAGES;
ei_status.reset_8390 = &hydra_reset_8390;
ei_status.block_input = &hydra_block_input;
ei_status.block_output = &hydra_block_output;
ei_status.get_8390_hdr = &hydra_get_8390_hdr;
ei_status.reg_offset = hydra_offsets;
dev->open = &hydra_open;
dev->stop = &hydra_close;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = ei_poll;
#endif
NS8390_init(dev, 0);
err = register_netdev(dev);
if (err) {
free_irq(IRQ_AMIGA_PORTS, dev);
free_netdev(dev);
return err;
}
zorro_set_drvdata(z, dev);
printk(KERN_INFO "%s: Hydra at 0x%08lx, address "
"%02x:%02x:%02x:%02x:%02x:%02x (hydra.c " HYDRA_VERSION ")\n",
dev->name, z->resource.start, dev->dev_addr[0], dev->dev_addr[1],
dev->dev_addr[2], dev->dev_addr[3], dev->dev_addr[4],
dev->dev_addr[5]);
return 0;
}
static int hydra_open(struct net_device *dev)
{
ei_open(dev);
return 0;
}
static int hydra_close(struct net_device *dev)
{
if (ei_debug > 1)
printk(KERN_DEBUG "%s: Shutting down ethercard.\n", dev->name);
ei_close(dev);
return 0;
}
static void hydra_reset_8390(struct net_device *dev)
{
printk(KERN_INFO "Hydra hw reset not there\n");
}
static void hydra_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page)
{
int nic_base = dev->base_addr;
short *ptrs;
unsigned long hdr_start= (nic_base-HYDRA_NIC_BASE) +
((ring_page - NESM_START_PG)<<8);
ptrs = (short *)hdr;
*(ptrs++) = z_readw(hdr_start);
*((short *)hdr) = WORDSWAP(*((short *)hdr));
hdr_start += 2;
*(ptrs++) = z_readw(hdr_start);
*((short *)hdr+1) = WORDSWAP(*((short *)hdr+1));
}
static void hydra_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset)
{
unsigned long nic_base = dev->base_addr;
unsigned long mem_base = nic_base - HYDRA_NIC_BASE;
unsigned long xfer_start = mem_base + ring_offset - (NESM_START_PG<<8);
if (count&1)
count++;
if (xfer_start+count > mem_base + (NESM_STOP_PG<<8)) {
int semi_count = (mem_base + (NESM_STOP_PG<<8)) - xfer_start;
z_memcpy_fromio(skb->data,xfer_start,semi_count);
count -= semi_count;
z_memcpy_fromio(skb->data+semi_count, mem_base, count);
} else
z_memcpy_fromio(skb->data, xfer_start,count);
}
static void hydra_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
unsigned long nic_base = dev->base_addr;
unsigned long mem_base = nic_base - HYDRA_NIC_BASE;
if (count&1)
count++;
z_memcpy_toio(mem_base+((start_page - NESM_START_PG)<<8), buf, count);
}
static void __devexit hydra_remove_one(struct zorro_dev *z)
{
struct net_device *dev = zorro_get_drvdata(z);
unregister_netdev(dev);
free_irq(IRQ_AMIGA_PORTS, dev);
release_mem_region(ZTWO_PADDR(dev->base_addr)-HYDRA_NIC_BASE, 0x10000);
free_netdev(dev);
}
static int __init hydra_init_module(void)
{
return zorro_register_driver(&hydra_driver);
}
static void __exit hydra_cleanup_module(void)
{
zorro_unregister_driver(&hydra_driver);
}
module_init(hydra_init_module);
module_exit(hydra_cleanup_module);
MODULE_LICENSE("GPL");
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