diff options
Diffstat (limited to 'drivers/mtd/maps/sbc_gxx.c')
| -rw-r--r-- | drivers/mtd/maps/sbc_gxx.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/mtd/maps/sbc_gxx.c b/drivers/mtd/maps/sbc_gxx.c new file mode 100644 index 000000000..4337d279a --- /dev/null +++ b/drivers/mtd/maps/sbc_gxx.c @@ -0,0 +1,236 @@ +/* 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/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 const 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 ) { + mtd_device_unregister(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. */ + mtd_device_register(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"); |