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linux/drivers/net/mac8390.c
Al Viro 8c6270f957 [PATCH] 8390 fixes - m68k oddballs 
more 8390 conversions - mac8390, zorro8390 and hydra got the same treatment
as arm etherh; one more case in 8390.h ifdef cascade is gone.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-12-02 00:11:56 -05:00

760 lines
21 KiB
C
Raw Blame History

/* mac8390.c: New driver for 8390-based Nubus (or Nubus-alike)
Ethernet cards on Linux */
/* Based on the former daynaport.c driver, by Alan Cox. Some code
taken from or inspired by skeleton.c by Donald Becker, acenic.c by
Jes Sorensen, and ne2k-pci.c by Donald Becker and Paul Gortmaker.
This software may be used and distributed according to the terms of
the GNU Public License, incorporated herein by reference. */
/* 2000-02-28: support added for Dayna and Kinetics cards by
A.G.deWijn@phys.uu.nl */
/* 2000-04-04: support added for Dayna2 by bart@etpmod.phys.tue.nl */
/* 2001-04-18: support for DaynaPort E/LC-M by rayk@knightsmanor.org */
/* 2001-05-15: support for Cabletron ported from old daynaport driver
* and fixed access to Sonic Sys card which masquerades as a Farallon
* by rayk@knightsmanor.org */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/nubus.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/hwtest.h>
#include <asm/macints.h>
static char version[] =
"mac8390.c: v0.4 2001-05-15 David Huggins-Daines <dhd@debian.org> and others\n";
#define EI_SHIFT(x) (ei_local->reg_offset[x])
#define ei_inb(port) in_8(port)
#define ei_outb(val,port) out_8(port,val)
#define ei_inb_p(port) in_8(port)
#define ei_outb_p(val,port) out_8(port,val)
#include "lib8390.c"
#define WD_START_PG 0x00 /* First page of TX buffer */
#define CABLETRON_RX_START_PG 0x00 /* First page of RX buffer */
#define CABLETRON_RX_STOP_PG 0x30 /* Last page +1 of RX ring */
#define CABLETRON_TX_START_PG CABLETRON_RX_STOP_PG /* First page of TX buffer */
/* Unfortunately it seems we have to hardcode these for the moment */
/* Shouldn't the card know about this? Does anyone know where to read it off the card? Do we trust the data provided by the card? */
#define DAYNA_8390_BASE 0x80000
#define DAYNA_8390_MEM 0x00000
#define KINETICS_8390_BASE 0x80000
#define KINETICS_8390_MEM 0x00000
#define CABLETRON_8390_BASE 0x90000
#define CABLETRON_8390_MEM 0x00000
enum mac8390_type {
MAC8390_NONE = -1,
MAC8390_APPLE,
MAC8390_ASANTE,
MAC8390_FARALLON, /* Apple, Asante, and Farallon are all compatible */
MAC8390_CABLETRON,
MAC8390_DAYNA,
MAC8390_INTERLAN,
MAC8390_KINETICS,
MAC8390_FOCUS,
MAC8390_SONICSYS,
MAC8390_DAYNA2,
MAC8390_DAYNA3,
};
static const char * cardname[] = {
"apple",
"asante",
"farallon",
"cabletron",
"dayna",
"interlan",
"kinetics",
"focus",
"sonic systems",
"dayna2",
"dayna_lc",
};
static int word16[] = {
1, /* apple */
1, /* asante */
1, /* farallon */
1, /* cabletron */
0, /* dayna */
1, /* interlan */
0, /* kinetics */
1, /* focus (??) */
1, /* sonic systems */
1, /* dayna2 */
1, /* dayna-lc */
};
/* on which cards do we use NuBus resources? */
static int useresources[] = {
1, /* apple */
1, /* asante */
1, /* farallon */
0, /* cabletron */
0, /* dayna */
0, /* interlan */
0, /* kinetics */
0, /* focus (??) */
1, /* sonic systems */
1, /* dayna2 */
1, /* dayna-lc */
};
extern enum mac8390_type mac8390_ident(struct nubus_dev * dev);
extern int mac8390_memsize(unsigned long membase);
extern int mac8390_memtest(struct net_device * dev);
static int mac8390_initdev(struct net_device * dev, struct nubus_dev * ndev,
enum mac8390_type type);
static int mac8390_open(struct net_device * dev);
static int mac8390_close(struct net_device * dev);
static void mac8390_no_reset(struct net_device *dev);
/* Sane (32-bit chunk memory read/write) - Apple/Asante/Farallon do this*/
static void sane_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page);
static void sane_block_input(struct net_device * dev, int count,
struct sk_buff * skb, int ring_offset);
static void sane_block_output(struct net_device * dev, int count,
const unsigned char * buf, const int start_page);
/* dayna_memcpy to and from card */
static void dayna_memcpy_fromcard(struct net_device *dev, void *to,
int from, int count);
static void dayna_memcpy_tocard(struct net_device *dev, int to,
const void *from, int count);
/* Dayna - Dayna/Kinetics use this */
static void dayna_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page);
static void dayna_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void dayna_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
/* Slow Sane (16-bit chunk memory read/write) Cabletron uses this */
static void slow_sane_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page);
static void slow_sane_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void slow_sane_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void word_memcpy_tocard(void *tp, const void *fp, int count);
static void word_memcpy_fromcard(void *tp, const void *fp, int count);
enum mac8390_type __init mac8390_ident(struct nubus_dev * dev)
{
if (dev->dr_sw == NUBUS_DRSW_ASANTE)
return MAC8390_ASANTE;
if (dev->dr_sw == NUBUS_DRSW_FARALLON)
return MAC8390_FARALLON;
if (dev->dr_sw == NUBUS_DRSW_KINETICS)
return MAC8390_KINETICS;
if (dev->dr_sw == NUBUS_DRSW_DAYNA)
return MAC8390_DAYNA;
if (dev->dr_sw == NUBUS_DRSW_DAYNA2)
return MAC8390_DAYNA2;
if (dev->dr_sw == NUBUS_DRSW_DAYNA_LC)
return MAC8390_DAYNA3;
if (dev->dr_hw == NUBUS_DRHW_CABLETRON)
return MAC8390_CABLETRON;
return MAC8390_NONE;
}
int __init mac8390_memsize(unsigned long membase)
{
unsigned long flags;
int i, j;
local_irq_save(flags);
/* Check up to 32K in 4K increments */
for (i = 0; i < 8; i++) {
volatile unsigned short *m = (unsigned short *) (membase + (i * 0x1000));
/* Unwriteable - we have a fully decoded card and the
RAM end located */
if (hwreg_present(m) == 0)
break;
/* write a distinctive byte */
*m = 0xA5A0 | i;
/* check that we read back what we wrote */
if (*m != (0xA5A0 | i))
break;
/* check for partial decode and wrap */
for (j = 0; j < i; j++) {
volatile unsigned short *p = (unsigned short *) (membase + (j * 0x1000));
if (*p != (0xA5A0 | j))
break;
}
}
local_irq_restore(flags);
/* in any case, we stopped once we tried one block too many,
or once we reached 32K */
return i * 0x1000;
}
struct net_device * __init mac8390_probe(int unit)
{
struct net_device *dev;
volatile unsigned short *i;
int version_disp = 0;
struct nubus_dev * ndev = NULL;
int err = -ENODEV;
struct nubus_dir dir;
struct nubus_dirent ent;
int offset;
static unsigned int slots;
enum mac8390_type cardtype;
/* probably should check for Nubus instead */
if (!MACH_IS_MAC)
return ERR_PTR(-ENODEV);
dev = ____alloc_ei_netdev(0);
if (!dev)
return ERR_PTR(-ENOMEM);
if (unit >= 0)
sprintf(dev->name, "eth%d", unit);
SET_MODULE_OWNER(dev);
while ((ndev = nubus_find_type(NUBUS_CAT_NETWORK, NUBUS_TYPE_ETHERNET, ndev))) {
/* Have we seen it already? */
if (slots & (1<<ndev->board->slot))
continue;
slots |= 1<<ndev->board->slot;
if ((cardtype = mac8390_ident(ndev)) == MAC8390_NONE)
continue;
if (version_disp == 0) {
version_disp = 1;
printk(version);
}
dev->irq = SLOT2IRQ(ndev->board->slot);
/* This is getting to be a habit */
dev->base_addr = ndev->board->slot_addr | ((ndev->board->slot&0xf) << 20);
/* Get some Nubus info - we will trust the card's idea
of where its memory and registers are. */
if (nubus_get_func_dir(ndev, &dir) == -1) {
printk(KERN_ERR "%s: Unable to get Nubus functional"
" directory for slot %X!\n",
dev->name, ndev->board->slot);
continue;
}
/* Get the MAC address */
if ((nubus_find_rsrc(&dir, NUBUS_RESID_MAC_ADDRESS, &ent)) == -1) {
printk(KERN_INFO "%s: Couldn't get MAC address!\n",
dev->name);
continue;
} else {
nubus_get_rsrc_mem(dev->dev_addr, &ent, 6);
/* Some Sonic Sys cards masquerade as Farallon */
if (cardtype == MAC8390_FARALLON &&
dev->dev_addr[0] == 0x0 &&
dev->dev_addr[1] == 0x40 &&
dev->dev_addr[2] == 0x10) {
/* This is really Sonic Sys card */
cardtype = MAC8390_SONICSYS;
}
}
if (useresources[cardtype] == 1) {
nubus_rewinddir(&dir);
if (nubus_find_rsrc(&dir, NUBUS_RESID_MINOR_BASEOS, &ent) == -1) {
printk(KERN_ERR "%s: Memory offset resource"
" for slot %X not found!\n",
dev->name, ndev->board->slot);
continue;
}
nubus_get_rsrc_mem(&offset, &ent, 4);
dev->mem_start = dev->base_addr + offset;
/* yes, this is how the Apple driver does it */
dev->base_addr = dev->mem_start + 0x10000;
nubus_rewinddir(&dir);
if (nubus_find_rsrc(&dir, NUBUS_RESID_MINOR_LENGTH, &ent) == -1) {
printk(KERN_INFO "%s: Memory length resource"
" for slot %X not found"
", probing\n",
dev->name, ndev->board->slot);
offset = mac8390_memsize(dev->mem_start);
} else {
nubus_get_rsrc_mem(&offset, &ent, 4);
}
dev->mem_end = dev->mem_start + offset;
} else {
switch (cardtype) {
case MAC8390_KINETICS:
case MAC8390_DAYNA: /* it's the same */
dev->base_addr =
(int)(ndev->board->slot_addr +
DAYNA_8390_BASE);
dev->mem_start =
(int)(ndev->board->slot_addr +
DAYNA_8390_MEM);
dev->mem_end =
dev->mem_start +
mac8390_memsize(dev->mem_start);
break;
case MAC8390_CABLETRON:
dev->base_addr =
(int)(ndev->board->slot_addr +
CABLETRON_8390_BASE);
dev->mem_start =
(int)(ndev->board->slot_addr +
CABLETRON_8390_MEM);
/* The base address is unreadable if 0x00
* has been written to the command register
* Reset the chip by writing E8390_NODMA +
* E8390_PAGE0 + E8390_STOP just to be
* sure
*/
i = (void *)dev->base_addr;
*i = 0x21;
dev->mem_end =
dev->mem_start +
mac8390_memsize(dev->mem_start);
break;
default:
printk(KERN_ERR "Card type %s is"
" unsupported, sorry\n",
cardname[cardtype]);
continue;
}
}
/* Do the nasty 8390 stuff */
if (!mac8390_initdev(dev, ndev, cardtype))
break;
}
if (!ndev)
goto out;
err = register_netdev(dev);
if (err)
goto out;
return dev;
out:
free_netdev(dev);
return ERR_PTR(err);
}
#ifdef MODULE
MODULE_AUTHOR("David Huggins-Daines <dhd@debian.org> and others");
MODULE_DESCRIPTION("Macintosh NS8390-based Nubus Ethernet driver");
MODULE_LICENSE("GPL");
/* overkill, of course */
static struct net_device *dev_mac8390[15];
int init_module(void)
{
int i;
for (i = 0; i < 15; i++) {
struct net_device *dev = mac8390_probe(-1);
if (IS_ERR(dev))
break;
dev_mac890[i] = dev;
}
if (!i) {
printk(KERN_NOTICE "mac8390.c: No useable cards found, driver NOT installed.\n");
return -ENODEV;
}
return 0;
}
void cleanup_module(void)
{
int i;
for (i = 0; i < 15; i++) {
struct net_device *dev = dev_mac890[i];
if (dev) {
unregister_netdev(dev);
free_netdev(dev);
}
}
}
#endif /* MODULE */
static int __init mac8390_initdev(struct net_device * dev, struct nubus_dev * ndev,
enum mac8390_type type)
{
static u32 fwrd4_offsets[16]={
0, 4, 8, 12,
16, 20, 24, 28,
32, 36, 40, 44,
48, 52, 56, 60
};
static u32 back4_offsets[16]={
60, 56, 52, 48,
44, 40, 36, 32,
28, 24, 20, 16,
12, 8, 4, 0
};
static u32 fwrd2_offsets[16]={
0, 2, 4, 6,
8, 10, 12, 14,
16, 18, 20, 22,
24, 26, 28, 30
};
int access_bitmode;
/* Now fill in our stuff */
dev->open = &mac8390_open;
dev->stop = &mac8390_close;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = __ei_poll;
#endif
/* GAR, ei_status is actually a macro even though it looks global */
ei_status.name = cardname[type];
ei_status.word16 = word16[type];
/* Cabletron's TX/RX buffers are backwards */
if (type == MAC8390_CABLETRON) {
ei_status.tx_start_page = CABLETRON_TX_START_PG;
ei_status.rx_start_page = CABLETRON_RX_START_PG;
ei_status.stop_page = CABLETRON_RX_STOP_PG;
ei_status.rmem_start = dev->mem_start;
ei_status.rmem_end = dev->mem_start + CABLETRON_RX_STOP_PG*256;
} else {
ei_status.tx_start_page = WD_START_PG;
ei_status.rx_start_page = WD_START_PG + TX_PAGES;
ei_status.stop_page = (dev->mem_end - dev->mem_start)/256;
ei_status.rmem_start = dev->mem_start + TX_PAGES*256;
ei_status.rmem_end = dev->mem_end;
}
/* Fill in model-specific information and functions */
switch(type) {
case MAC8390_SONICSYS:
/* 16 bit card, register map is reversed */
ei_status.reset_8390 = &mac8390_no_reset;
ei_status.block_input = &slow_sane_block_input;
ei_status.block_output = &slow_sane_block_output;
ei_status.get_8390_hdr = &slow_sane_get_8390_hdr;
ei_status.reg_offset = back4_offsets;
access_bitmode = 0;
break;
case MAC8390_FARALLON:
case MAC8390_APPLE:
case MAC8390_ASANTE:
case MAC8390_DAYNA2:
case MAC8390_DAYNA3:
/* 32 bit card, register map is reversed */
/* sane */
ei_status.reset_8390 = &mac8390_no_reset;
ei_status.block_input = &sane_block_input;
ei_status.block_output = &sane_block_output;
ei_status.get_8390_hdr = &sane_get_8390_hdr;
ei_status.reg_offset = back4_offsets;
access_bitmode = 1;
break;
case MAC8390_CABLETRON:
/* 16 bit card, register map is short forward */
ei_status.reset_8390 = &mac8390_no_reset;
ei_status.block_input = &slow_sane_block_input;
ei_status.block_output = &slow_sane_block_output;
ei_status.get_8390_hdr = &slow_sane_get_8390_hdr;
ei_status.reg_offset = fwrd2_offsets;
access_bitmode = 0;
break;
case MAC8390_DAYNA:
case MAC8390_KINETICS:
/* 16 bit memory */
/* dayna and similar */
ei_status.reset_8390 = &mac8390_no_reset;
ei_status.block_input = &dayna_block_input;
ei_status.block_output = &dayna_block_output;
ei_status.get_8390_hdr = &dayna_get_8390_hdr;
ei_status.reg_offset = fwrd4_offsets;
access_bitmode = 0;
break;
default:
printk(KERN_ERR "Card type %s is unsupported, sorry\n", cardname[type]);
return -ENODEV;
}
__NS8390_init(dev, 0);
/* Good, done, now spit out some messages */
printk(KERN_INFO "%s: %s in slot %X (type %s)\n",
dev->name, ndev->board->name, ndev->board->slot, cardname[type]);
printk(KERN_INFO "MAC ");
{
int i;
for (i = 0; i < 6; i++) {
printk("%2.2x", dev->dev_addr[i]);
if (i < 5)
printk(":");
}
}
printk(" IRQ %d, shared memory at %#lx-%#lx, %d-bit access.\n",
dev->irq, dev->mem_start, dev->mem_end-1,
access_bitmode?32:16);
return 0;
}
static int mac8390_open(struct net_device *dev)
{
__ei_open(dev);
if (request_irq(dev->irq, __ei_interrupt, 0, "8390 Ethernet", dev)) {
printk ("%s: unable to get IRQ %d.\n", dev->name, dev->irq);
return -EAGAIN;
}
return 0;
}
static int mac8390_close(struct net_device *dev)
{
free_irq(dev->irq, dev);
__ei_close(dev);
return 0;
}
static void mac8390_no_reset(struct net_device *dev)
{
ei_status.txing = 0;
if (ei_debug > 1)
printk("reset not supported\n");
return;
}
/* dayna_memcpy_fromio/dayna_memcpy_toio */
/* directly from daynaport.c by Alan Cox */
static void dayna_memcpy_fromcard(struct net_device *dev, void *to, int from, int count)
{
volatile unsigned char *ptr;
unsigned char *target=to;
from<<=1; /* word, skip overhead */
ptr=(unsigned char *)(dev->mem_start+from);
/* Leading byte? */
if (from&2) {
*target++ = ptr[-1];
ptr += 2;
count--;
}
while(count>=2)
{
*(unsigned short *)target = *(unsigned short volatile *)ptr;
ptr += 4; /* skip cruft */
target += 2;
count-=2;
}
/* Trailing byte? */
if(count)
*target = *ptr;
}
static void dayna_memcpy_tocard(struct net_device *dev, int to, const void *from, int count)
{
volatile unsigned short *ptr;
const unsigned char *src=from;
to<<=1; /* word, skip overhead */
ptr=(unsigned short *)(dev->mem_start+to);
/* Leading byte? */
if (to&2) { /* avoid a byte write (stomps on other data) */
ptr[-1] = (ptr[-1]&0xFF00)|*src++;
ptr++;
count--;
}
while(count>=2)
{
*ptr++=*(unsigned short *)src; /* Copy and */
ptr++; /* skip cruft */
src += 2;
count-=2;
}
/* Trailing byte? */
if(count)
{
/* card doesn't like byte writes */
*ptr=(*ptr&0x00FF)|(*src << 8);
}
}
/* sane block input/output */
static void sane_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page)
{
unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
memcpy_fromio((void *)hdr, (char *)dev->mem_start + hdr_start, 4);
/* Fix endianness */
hdr->count = swab16(hdr->count);
}
static void sane_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset)
{
unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
unsigned long xfer_start = xfer_base + dev->mem_start;
if (xfer_start + count > ei_status.rmem_end) {
/* We must wrap the input move. */
int semi_count = ei_status.rmem_end - xfer_start;
memcpy_fromio(skb->data, (char *)dev->mem_start + xfer_base, semi_count);
count -= semi_count;
memcpy_toio(skb->data + semi_count, (char *)ei_status.rmem_start, count);
} else {
memcpy_fromio(skb->data, (char *)dev->mem_start + xfer_base, count);
}
}
static void sane_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
long shmem = (start_page - WD_START_PG)<<8;
memcpy_toio((char *)dev->mem_start + shmem, buf, count);
}
/* dayna block input/output */
static void dayna_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
{
unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
dayna_memcpy_fromcard(dev, (void *)hdr, hdr_start, 4);
/* Fix endianness */
hdr->count=(hdr->count&0xFF)<<8|(hdr->count>>8);
}
static void dayna_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
unsigned long xfer_start = xfer_base+dev->mem_start;
/* Note the offset math is done in card memory space which is word
per long onto our space. */
if (xfer_start + count > ei_status.rmem_end)
{
/* We must wrap the input move. */
int semi_count = ei_status.rmem_end - xfer_start;
dayna_memcpy_fromcard(dev, skb->data, xfer_base, semi_count);
count -= semi_count;
dayna_memcpy_fromcard(dev, skb->data + semi_count,
ei_status.rmem_start - dev->mem_start,
count);
}
else
{
dayna_memcpy_fromcard(dev, skb->data, xfer_base, count);
}
}
static void dayna_block_output(struct net_device *dev, int count, const unsigned char *buf,
int start_page)
{
long shmem = (start_page - WD_START_PG)<<8;
dayna_memcpy_tocard(dev, shmem, buf, count);
}
/* Cabletron block I/O */
static void slow_sane_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page)
{
unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
word_memcpy_fromcard((void *)hdr, (char *)dev->mem_start+hdr_start, 4);
/* Register endianism - fix here rather than 8390.c */
hdr->count = (hdr->count&0xFF)<<8|(hdr->count>>8);
}
static void slow_sane_block_input(struct net_device *dev, int count, struct sk_buff *skb,
int ring_offset)
{
unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
unsigned long xfer_start = xfer_base+dev->mem_start;
if (xfer_start + count > ei_status.rmem_end)
{
/* We must wrap the input move. */
int semi_count = ei_status.rmem_end - xfer_start;
word_memcpy_fromcard(skb->data, (char *)dev->mem_start +
xfer_base, semi_count);
count -= semi_count;
word_memcpy_fromcard(skb->data + semi_count,
(char *)ei_status.rmem_start, count);
}
else
{
word_memcpy_fromcard(skb->data, (char *)dev->mem_start +
xfer_base, count);
}
}
static void slow_sane_block_output(struct net_device *dev, int count, const unsigned char *buf,
int start_page)
{
long shmem = (start_page - WD_START_PG)<<8;
word_memcpy_tocard((char *)dev->mem_start + shmem, buf, count);
}
static void word_memcpy_tocard(void *tp, const void *fp, int count)
{
volatile unsigned short *to = tp;
const unsigned short *from = fp;
count++;
count/=2;
while(count--)
*to++=*from++;
}
static void word_memcpy_fromcard(void *tp, const void *fp, int count)
{
unsigned short *to = tp;
const volatile unsigned short *from = fp;
count++;
count/=2;
while(count--)
*to++=*from++;
}
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