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* Moxa C101 synchronous serial card driver for Linux
*
* Copyright (C) 2000 Krzysztof Halasa <khc@pm.waw.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Requires hdlc.c, a generic HDLC support module
* Available from ftp://ftp.pm.waw.pl/pub/Linux/hdlc/
*
* Current status:
* - this is work in progress
* - no support for SMP yet
*
* Sources of information:
* Hitachi HD64570 SCA User's Manual
* Moxa C101 User's Manual
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <asm/io.h>
#include <asm/delay.h>
#include "syncppp.h"
#include <linux/hdlc.h>
#include "hd64570.h"
#define DEBUG_RINGS
#undef DEBUG_PKT
static const char* version = "Moxa C101 driver revision: 1.0-pre9";
static const char* devname = "C101";
#define C101_PAGE 0x1D00
#define C101_DTR 0x1E00
#define C101_SCA 0x1F00
#define C101_WINDOW_SIZE 0x2000
#define RAM_SIZE (256*1024)
#define CLOCK_BASE 9830400 /* 9.8304 MHz */
#define PAGE0_ALWAYS_MAPPED
static char *hw=NULL; /* pointer to hw=xxx command line string */
typedef struct card_s {
hdlc_device hdlc; /* HDLC device struct - must be first */
int clkmode; /* clock speed, 0=ext */
int loopback;
u8 *win0base; /* ISA window base address */
u16 buff_offset; /* offset of first buffer of first channel */
u8 irq; /* IRQ (3-15) */
u8 ring_buffers; /* number of buffers in a ring */
u8 page;
u8 rxin; /* rx ring buffer 'in' pointer */
u8 txin; /* tx ring buffer 'in' and 'last' pointers */
u8 txlast;
struct card_s *next_card;
}card_t;
typedef card_t port_t;
#define sca_in(reg, card) readb((card)->win0base+C101_SCA+(reg))
#define sca_out(value, reg, card) writeb(value, (card)->win0base+C101_SCA+(reg))
#define sca_inw(reg, card) readw((card)->win0base+C101_SCA+(reg))
#define sca_outw(value, reg, card) writew(value, (card)->win0base+C101_SCA+(reg))
#define port_to_card(port) (port)
#define log_node(port) (0)
#define phy_node(port) (0)
#define winsize(card) (C101_WINDOW_SIZE)
#define win0base(card) ((card)->win0base)
#define winbase(card) ((card)->win0base+0x2000)
#define get_port(card, port) ((port) == 0 ? (card) : NULL)
static __inline__ u8 sca_get_page(card_t *card)
{
return card->page;
}
static __inline__ void openwin(card_t *card, u8 page)
{
card->page=page;
writeb(page, card->win0base+C101_PAGE);
}
#define close_windows(card) {} /* no hardware support */
static __inline__ int set_clock(port_t *port, int clock)
{
port->clkmode = clock; /* selectable by jumper */
return 0;
}
#define select_phys_iface(port, iface) (-EINVAL) /* No hardware support */
static __inline__ void open_port(port_t *port)
{
writeb(1, port->win0base+C101_DTR);
sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */
}
static __inline__ void close_port(port_t *port)
{
writeb(0, port->win0base+C101_DTR);
sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port);
}
#include "hd6457x.c"
static void c101_destroy_card(card_t *card)
{
if (card->irq)
free_irq(card->irq, card);
kfree(card);
}
static int c101_run(unsigned long irq, unsigned long winbase)
{
card_t *card;
int result;
if (irq<3 || irq>15 || irq == 6) /* FIXME */ {
printk(KERN_ERR "c101: invalid IRQ value\n");
return -ENODEV;
}
if (winbase<0xC0000 || winbase>0xDFFFF || (winbase&0x3FFF)!=0) {
printk(KERN_ERR "c101: invalid RAM value\n");
return -ENODEV;
}
card=kmalloc(sizeof(card_t), GFP_KERNEL);
if (card==NULL) {
printk(KERN_ERR "c101: unable to allocate memory\n");
return -ENOBUFS;
}
memset(card, 0, sizeof(card_t));
if (request_irq(irq, sca_intr, 0, devname, card)) {
printk(KERN_ERR "c101: could not allocate IRQ\n");
c101_destroy_card(card);
return(-EBUSY);
}
card->irq=irq;
card->win0base=(u8*)winbase;
/* 2 rings required for 1 port */
card->ring_buffers = (RAM_SIZE-C101_WINDOW_SIZE) / (2 * HDLC_MAX_MTU);
printk(KERN_DEBUG "c101: using %u packets rings\n",card->ring_buffers);
card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
readb(card->win0base+C101_PAGE); /* Resets SCA? */
udelay(100);
writeb(0, card->win0base+C101_PAGE);
writeb(0, card->win0base+C101_DTR); /* Power-up for RAM? */
sca_init(card, 0);
card->hdlc.ioctl=sca_ioctl;
card->hdlc.open=sca_open;
card->hdlc.close=sca_close;
hdlc_to_dev(&card->hdlc)->hard_start_xmit=sca_xmit;
hdlc_to_dev(&card->hdlc)->irq=irq;
hdlc_to_dev(&card->hdlc)->tx_queue_len=50;
result=register_hdlc_device(&card->hdlc);
if (result) {
printk(KERN_WARNING "c101: unable to register hdlc device\n");
c101_destroy_card(card);
return result;
}
sca_init_sync_port(card); /* Set up C101 memory */
*new_card=card;
new_card=&card->next_card;
return 0;
}
void c101_init(void)
{
if (hw==NULL)
return;
printk(KERN_INFO "%s\n", version);
do {
unsigned long irq, ram;
irq=simple_strtoul(hw, &hw, 0);
if (*hw++ != ',')
break;
ram=simple_strtoul(hw, &hw, 0);
if (*hw == ':' || *hw == '\x0')
c101_run(irq, ram);
if (*hw == '\x0')
return;
}while(*hw++ == ':');
printk(KERN_ERR "c101: invalid hardware parameters\n");
}
#ifndef MODULE
void c101_setup(char *str, int *ints)
{
hw=str;
}
#else
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("Moxa C101 serial port driver");
MODULE_PARM(hw, "s"); /* hw=irq,ram,clock:irq,... */
EXPORT_NO_SYMBOLS;
int init_module(void)
{
if (hw==NULL) {
printk(KERN_ERR "c101: no card initialized\n");
return -ENOSYS; /* no parameters specified, abort */
}
c101_init();
return first_card ? 0 : -ENOSYS;
}
void cleanup_module(void)
{
card_t *card=first_card;
while (card) {
card_t *ptr=card;
card=card->next_card;
unregister_hdlc_device(&ptr->hdlc);
c101_destroy_card(ptr);
}
}
#endif /* MODULE */
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