/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX, SBC-GXm and SBC-GX1 series boards. Copyright (C) 2001 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 The SBC-MediaGX / SBC-GXx has up to 16 MiB of Intel StrataFlash (28F320/28F640) in x8 mode. This driver uses the CFI probe and Intel Extended Command Set drivers. The flash is accessed as follows: 16 KiB memory window at 0xdc000-0xdffff Two IO address locations for paging 0x258 bit 0-7: address bit 14-21 0x259 bit 0-1: address bit 22-23 bit 7: 0 - reset/powered down 1 - device enabled The single flash device is divided into 3 partition which appear as separate MTD devices. 25/04/2001 AJL (Arcom) Modified signon strings and partition sizes (to support bzImages up to 638KiB-ish) */ // Includes #include <linux/module.h> #include <linux/slab.h> #include <linux/ioport.h> #include <linux/init.h> #include <asm/io.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> // Defines // - Hardware specific #define WINDOW_START 0xdc000 /* Number of bits in offset. */ #define WINDOW_SHIFT 14 #define WINDOW_LENGTH (1 << WINDOW_SHIFT) /* The bits for the offset into the window. */ #define WINDOW_MASK (WINDOW_LENGTH-1) #define PAGE_IO 0x258 #define PAGE_IO_SIZE 2 /* bit 7 of 0x259 must be 1 to enable device. */ #define DEVICE_ENABLE 0x8000 // - Flash / Partition sizing #define MAX_SIZE_KiB 16384 #define BOOT_PARTITION_SIZE_KiB 768 #define DATA_PARTITION_SIZE_KiB 1280 #define APP_PARTITION_SIZE_KiB 6144 // Globals static volatile int page_in_window = -1; // Current page in window. static void __iomem *iomapadr; static DEFINE_SPINLOCK(sbc_gxx_spin); /* 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 = "SBC-GXx flash boot partition", .offset = 0, .size = BOOT_PARTITION_SIZE_KiB*1024 }, { .name = "SBC-GXx flash data partition", .offset = BOOT_PARTITION_SIZE_KiB*1024, .size = (DATA_PARTITION_SIZE_KiB)*1024 }, { .name = "SBC-GXx flash application partition", .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 } }; #define NUM_PARTITIONS 3 static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs) { unsigned long page = ofs >> WINDOW_SHIFT; if( page!=page_in_window ) { outw( page | DEVICE_ENABLE, PAGE_IO ); page_in_window = page; } } static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs) { map_word ret; spin_lock(&sbc_gxx_spin); sbc_gxx_page(map, ofs); ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); spin_unlock(&sbc_gxx_spin); return ret; } static void sbc_gxx_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(&sbc_gxx_spin); sbc_gxx_page(map, from); memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen); spin_unlock(&sbc_gxx_spin); to += thislen; from += thislen; len -= thislen; } } static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr) { spin_lock(&sbc_gxx_spin); sbc_gxx_page(map, adr); writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); spin_unlock(&sbc_gxx_spin); } static void sbc_gxx_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(&sbc_gxx_spin); sbc_gxx_page(map, to); memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen); spin_unlock(&sbc_gxx_spin); to += thislen; from += thislen; len -= thislen; } } static struct map_info sbc_gxx_map = { .name = "SBC-GXx flash", .phys = NO_XIP, .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount of flash so the cfi probe routines find all the chips */ .bankwidth = 1, .read = sbc_gxx_read8, .copy_from = sbc_gxx_copy_from, .write = sbc_gxx_write8, .copy_to = sbc_gxx_copy_to }; /* MTD device for all of the flash. */ static struct mtd_info *all_mtd; static void cleanup_sbc_gxx(void) { if( all_mtd ) { del_mtd_partitions( all_mtd ); map_destroy( all_mtd ); } iounmap(iomapadr); release_region(PAGE_IO,PAGE_IO_SIZE); } static int __init init_sbc_gxx(void) { iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH); if (!iomapadr) { printk( KERN_ERR"%s: failed to ioremap memory region\n", sbc_gxx_map.name ); return -EIO; } if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) { printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n", sbc_gxx_map.name, PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 ); iounmap(iomapadr); return -EAGAIN; } printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n", sbc_gxx_map.name, PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1, WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 ); /* Probe for chip. */ all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map ); if( !all_mtd ) { cleanup_sbc_gxx(); return -ENXIO; } all_mtd->owner = THIS_MODULE; /* Create MTD devices for each partition. */ add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS ); return 0; } module_init(init_sbc_gxx); module_exit(cleanup_sbc_gxx); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arcom Control Systems Ltd."); MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");