/* elan-104nc.c -- MTD map driver for Arcom Control Systems ELAN-104NC Copyright (C) 2000 Arcom Control System Ltd 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. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA $Id: elan-104nc.c,v 1.13 2002/02/13 15:30:20 dwmw2 Exp $ The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16 mode. This drivers uses the CFI probe and Intel Extended Command Set drivers. The flash is accessed as follows: 32 kbyte memory window at 0xb0000-0xb7fff 16 bit I/O port (0x22) for some sort of paging. The single flash device is divided into 3 partition which appear as seperate MTD devices. Linux thinks that the I/O port is used by the PIC and hence check_region() will always fail. So we don't do it. I just hope it doesn't break anything. */ #include #include #include #include #include #include #include #define WINDOW_START 0xb0000 /* Number of bits in offset. */ #define WINDOW_SHIFT 15 #define WINDOW_LENGTH (1 << WINDOW_SHIFT) /* The bits for the offset into the window. */ #define WINDOW_MASK (WINDOW_LENGTH-1) #define PAGE_IO 0x22 #define PAGE_IO_SIZE 2 static volatile int page_in_window = -1; // Current page in window. static unsigned long iomapadr; static spinlock_t elan_104nc_spin = SPIN_LOCK_UNLOCKED; /* partition_info gives details on the logical partitions that the split the * single flash device into. If the size if zero we use up to the end of the * device. */ static struct mtd_partition partition_info[]={ { name: "ELAN-104NC flash boot partition", offset: 0, size: 640*1024 }, { name: "ELAN-104NC flash partition 1", offset: 640*1024, size: 896*1024 }, { name: "ELAN-104NC flash partition 2", offset: (640+896)*1024 } }; #define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0])) /* * If no idea what is going on here. This is taken from the FlashFX stuff. */ #define ROMCS 1 static inline void elan_104nc_setup(void) { u16 t; outw( 0x0023 + ROMCS*2, PAGE_IO ); t=inb( PAGE_IO+1 ); t=(t & 0xf9) | 0x04; outw( ((0x0023 + ROMCS*2) | (t << 8)), PAGE_IO ); } static inline void elan_104nc_page(struct map_info *map, unsigned long ofs) { unsigned long page = ofs >> WINDOW_SHIFT; if( page!=page_in_window ) { int cmd1; int cmd2; cmd1=(page & 0x700) + 0x0833 + ROMCS*0x4000; cmd2=((page & 0xff) << 8) + 0x0032; outw( cmd1, PAGE_IO ); outw( cmd2, PAGE_IO ); page_in_window = page; } } static __u8 elan_104nc_read8(struct map_info *map, unsigned long ofs) { __u8 ret; spin_lock(&elan_104nc_spin); elan_104nc_page(map, ofs); ret = readb(iomapadr + (ofs & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); return ret; } static __u16 elan_104nc_read16(struct map_info *map, unsigned long ofs) { __u16 ret; spin_lock(&elan_104nc_spin); elan_104nc_page(map, ofs); ret = readw(iomapadr + (ofs & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); return ret; } static __u32 elan_104nc_read32(struct map_info *map, unsigned long ofs) { __u32 ret; spin_lock(&elan_104nc_spin); elan_104nc_page(map, ofs); ret = readl(iomapadr + (ofs & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); return ret; } static void elan_104nc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) { while(len) { unsigned long thislen = len; if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) thislen = WINDOW_LENGTH-(from & WINDOW_MASK); spin_lock(&elan_104nc_spin); elan_104nc_page(map, from); memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen); spin_unlock(&elan_104nc_spin); to += thislen; from += thislen; len -= thislen; } } static void elan_104nc_write8(struct map_info *map, __u8 d, unsigned long adr) { spin_lock(&elan_104nc_spin); elan_104nc_page(map, adr); writeb(d, iomapadr + (adr & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); } static void elan_104nc_write16(struct map_info *map, __u16 d, unsigned long adr) { spin_lock(&elan_104nc_spin); elan_104nc_page(map, adr); writew(d, iomapadr + (adr & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); } static void elan_104nc_write32(struct map_info *map, __u32 d, unsigned long adr) { spin_lock(&elan_104nc_spin); elan_104nc_page(map, adr); writel(d, iomapadr + (adr & WINDOW_MASK)); spin_unlock(&elan_104nc_spin); } static void elan_104nc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) { while(len) { unsigned long thislen = len; if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) thislen = WINDOW_LENGTH-(to & WINDOW_MASK); spin_lock(&elan_104nc_spin); elan_104nc_page(map, to); memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen); spin_unlock(&elan_104nc_spin); to += thislen; from += thislen; len -= thislen; } } static struct map_info elan_104nc_map = { name: "ELAN-104NC flash", size: 8*1024*1024, /* this must be set to a maximum possible amount of flash so the cfi probe routines find all the chips */ buswidth: 2, read8: elan_104nc_read8, read16: elan_104nc_read16, read32: elan_104nc_read32, copy_from: elan_104nc_copy_from, write8: elan_104nc_write8, write16: elan_104nc_write16, write32: elan_104nc_write32, copy_to: elan_104nc_copy_to }; /* MTD device for all of the flash. */ static struct mtd_info *all_mtd; static void cleanup_elan_104nc(void) { if( all_mtd ) { del_mtd_partitions( all_mtd ); map_destroy( all_mtd ); } iounmap((void *)iomapadr); release_region(PAGE_IO,PAGE_IO_SIZE); } int __init init_elan_104nc(void) { /* Urg! We use I/O port 0x22 without request_region()ing it */ /* if (check_region(PAGE_IO,PAGE_IO_SIZE) != 0) { printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n", elan_104nc_map.name, PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 ); return -EAGAIN; } */ iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH); if (!iomapadr) { printk( KERN_ERR"%s: failed to ioremap memory region\n", elan_104nc_map.name ); return -EIO; } /* request_region( PAGE_IO, PAGE_IO_SIZE, "ELAN-104NC flash" ); */ printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n", elan_104nc_map.name, PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1, WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 ); elan_104nc_setup(); /* Probe for chip. */ all_mtd = do_map_probe("cfi_probe", &elan_104nc_map ); if( !all_mtd ) { cleanup_elan_104nc(); return -ENXIO; } all_mtd->module=THIS_MODULE; /* Create MTD devices for each partition. */ add_mtd_partitions( all_mtd, partition_info, NUM_PARTITIONS ); return 0; } module_init(init_elan_104nc); module_exit(cleanup_elan_104nc); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arcom Control Systems Ltd."); MODULE_DESCRIPTION("MTD map driver for Arcom Control Systems ELAN-104NC");