/*  * mixmem - a block device driver for flash rom found on the  *          piggyback board of the multi-purpose mixcom card * * Author: Gergely Madarasz <gorgo@itc.hu>  * * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu> * * This code is GPL * */#include <linux/module.h>#include <linux/malloc.h>#include <linux/ioport.h>#include <asm/io.h>#include <linux/init.h>#include <linux/mtd/mapped.h>#define MIXCOM_ID_OFFSET 0xc10#define MIXCOM_PAGE_OFFSET 0xc11#define MIXCOM_ID_1 0x11#define MIXCOM_ID_2 0x13#define MIXMEM_PAGESIZE 4096#define FIRST_BLOCK_OFFSET 0x1000#if LINUX_VERSION_CODE < 0x20300#define __exit#endifstatic unsigned int mixmem_addrs[] = { 0xc8000, 0xd8000, 0 };static unsigned int mixcom_ports[] = { 0x180, 0x280, 0x380, 0 };// We could store these in the mtd structure, but we only support 1 device..static unsigned long base_io = 0;static unsigned long base_addr = 0;static struct mapped_mtd_info *SSD;static unsigned long mixmem_page(struct mapped_mtd_info *map,				 unsigned long page){	outb((char)(page & 0xff), base_io+MIXCOM_PAGE_OFFSET);	outb((char)((page >> 8) & 0x7), base_io+MIXCOM_PAGE_OFFSET+1);   	return base_addr;}static int flash_probe(int base){	int prev,curr;	unsigned long flags;	writeb(0xf0, base);	save_flags(flags); cli();		prev=readw(base);	writeb(0xaa, base+0x555);	writeb(0x55, base+0x2AA);	writeb(0x90, base+0x555);		curr=readw(base);		restore_flags(flags);	writeb(0xf0, base);	return(prev==curr?0:curr);}static int mixmem_probe(void) {	int i;	int id;	int chip;	        /* This should really check to see if the io ports are in use before           writing to them */	for(i=0;mixcom_ports[i]!=0;i++) {		id=inb(mixcom_ports[i]+MIXCOM_ID_OFFSET);		if(id==MIXCOM_ID_1 || id==MIXCOM_ID_2) {			printk("mixmem: mixcom board found at 0x%3x\n",mixcom_ports[i]);			break;		}	}		if(mixcom_ports[i]==0) {		printk("mixmem: no mixcom board found\n");		return -ENODEV;	}		if (check_region(mixcom_ports[i]+MIXCOM_PAGE_OFFSET, 2)) return -EAGAIN;			// What is the deal with first_block_offset?	for(i=0;mixmem_addrs[i]!=0;i++) {		chip=flash_probe(mixmem_addrs[i]+FIRST_BLOCK_OFFSET);		if(chip)break;	}		if(mixmem_addrs[i]==0) {		printk("mixmem: no flash available\n");		return -ENODEV;	}        base_io = mixcom_ports[i];        base_addr = mixmem_addrs[i];	request_region(mixcom_ports[i]+MIXCOM_PAGE_OFFSET, 2, "mixmem");        return 0;}static void __exit cleanup_mixmem(){	mtd_mapped_remove(SSD);	kfree(SSD);	SSD = 0;	release_region(base_io+MIXCOM_PAGE_OFFSET, 2);}//static int __init init_mixmem(void)int __init init_mixmem(void){      if (mixmem_probe() != 0)      return -EAGAIN;   // Print out our little header..   printk("mixcom MTD IO:0x%lx MEM:0x%lx-0x%lx\n",base_io,base_addr,	  base_addr+MIXMEM_PAGESIZE);      // Allocate some memory   SSD = (struct mapped_mtd_info *)kmalloc(sizeof(*SSD),GFP_KERNEL);   if (SSD == 0)      return 0;      memset(SSD,0,sizeof(*SSD));   // Setup the MTD structure   SSD->page = mixmem_page;   SSD->pagesize = MIXMEM_PAGESIZE;   SSD->maxsize = 0x7FF;   SSD->mtd.name = "mixcom piggyback";   // Setup the MTD, this will sense the flash parameters and so on..   if (mtd_mapped_setup(SSD) != 0)   {      printk("Failed to register new device\n");      cleanup_module();      return -EAGAIN;   }   return 0;}module_init(init_mixmem);module_exit(cleanup_mixmem);