diff options
Diffstat (limited to 'drivers/mtd/maps/octagon-5066.c')
-rw-r--r-- | drivers/mtd/maps/octagon-5066.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/mtd/maps/octagon-5066.c b/drivers/mtd/maps/octagon-5066.c new file mode 100644 index 000000000000..e5ff83de420e --- /dev/null +++ b/drivers/mtd/maps/octagon-5066.c @@ -0,0 +1,248 @@ +// $Id: octagon-5066.c,v 1.26 2004/07/12 22:38:29 dwmw2 Exp $ +/* ###################################################################### + + Octagon 5066 MTD Driver. + + The Octagon 5066 is a SBC based on AMD's 586-WB running at 133 MHZ. It + comes with a builtin AMD 29F016 flash chip and a socketed EEPROM that + is replacable by flash. Both units are mapped through a multiplexer + into a 32k memory window at 0xe8000. The control register for the + multiplexing unit is located at IO 0x208 with a bit map of + 0-5 Page Selection in 32k increments + 6-7 Device selection: + 00 SSD off + 01 SSD 0 (Socket) + 10 SSD 1 (Flash chip) + 11 undefined + + On each SSD, the first 128k is reserved for use by the bios + (actually it IS the bios..) This only matters if you are booting off the + flash, you must not put a file system starting there. + + The driver tries to do a detection algorithm to guess what sort of devices + are plugged into the sockets. + + ##################################################################### */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <asm/io.h> + +#include <linux/mtd/map.h> +#include <linux/mtd/mtd.h> + +#define WINDOW_START 0xe8000 +#define WINDOW_LENGTH 0x8000 +#define WINDOW_SHIFT 27 +#define WINDOW_MASK 0x7FFF +#define PAGE_IO 0x208 + +static volatile char page_n_dev = 0; +static unsigned long iomapadr; +static DEFINE_SPINLOCK(oct5066_spin); + +/* + * We use map_priv_1 to identify which device we are. + */ + +static void __oct5066_page(struct map_info *map, __u8 byte) +{ + outb(byte,PAGE_IO); + page_n_dev = byte; +} + +static inline void oct5066_page(struct map_info *map, unsigned long ofs) +{ + __u8 byte = map->map_priv_1 | (ofs >> WINDOW_SHIFT); + + if (page_n_dev != byte) + __oct5066_page(map, byte); +} + + +static map_word oct5066_read8(struct map_info *map, unsigned long ofs) +{ + map_word ret; + spin_lock(&oct5066_spin); + oct5066_page(map, ofs); + ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); + spin_unlock(&oct5066_spin); + return ret; +} + +static void oct5066_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(&oct5066_spin); + oct5066_page(map, from); + memcpy_fromio(to, iomapadr + from, thislen); + spin_unlock(&oct5066_spin); + to += thislen; + from += thislen; + len -= thislen; + } +} + +static void oct5066_write8(struct map_info *map, map_word d, unsigned long adr) +{ + spin_lock(&oct5066_spin); + oct5066_page(map, adr); + writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); + spin_unlock(&oct5066_spin); +} + +static void oct5066_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(&oct5066_spin); + oct5066_page(map, to); + memcpy_toio(iomapadr + to, from, thislen); + spin_unlock(&oct5066_spin); + to += thislen; + from += thislen; + len -= thislen; + } +} + +static struct map_info oct5066_map[2] = { + { + .name = "Octagon 5066 Socket", + .phys = NO_XIP, + .size = 512 * 1024, + .bankwidth = 1, + .read = oct5066_read8, + .copy_from = oct5066_copy_from, + .write = oct5066_write8, + .copy_to = oct5066_copy_to, + .map_priv_1 = 1<<6 + }, + { + .name = "Octagon 5066 Internal Flash", + .phys = NO_XIP, + .size = 2 * 1024 * 1024, + .bankwidth = 1, + .read = oct5066_read8, + .copy_from = oct5066_copy_from, + .write = oct5066_write8, + .copy_to = oct5066_copy_to, + .map_priv_1 = 2<<6 + } +}; + +static struct mtd_info *oct5066_mtd[2] = {NULL, NULL}; + +// OctProbe - Sense if this is an octagon card +// --------------------------------------------------------------------- +/* Perform a simple validity test, we map the window select SSD0 and + change pages while monitoring the window. A change in the window, + controlled by the PAGE_IO port is a functioning 5066 board. This will + fail if the thing in the socket is set to a uniform value. */ +static int __init OctProbe(void) +{ + unsigned int Base = (1 << 6); + unsigned long I; + unsigned long Values[10]; + for (I = 0; I != 20; I++) + { + outb(Base + (I%10),PAGE_IO); + if (I < 10) + { + // Record the value and check for uniqueness + Values[I%10] = readl(iomapadr); + if (I > 0 && Values[I%10] == Values[0]) + return -EAGAIN; + } + else + { + // Make sure we get the same values on the second pass + if (Values[I%10] != readl(iomapadr)) + return -EAGAIN; + } + } + return 0; +} + +void cleanup_oct5066(void) +{ + int i; + for (i=0; i<2; i++) { + if (oct5066_mtd[i]) { + del_mtd_device(oct5066_mtd[i]); + map_destroy(oct5066_mtd[i]); + } + } + iounmap((void *)iomapadr); + release_region(PAGE_IO, 1); +} + +int __init init_oct5066(void) +{ + int i; + int ret = 0; + + // Do an autoprobe sequence + if (!request_region(PAGE_IO,1,"Octagon SSD")) { + printk(KERN_NOTICE "5066: Page Register in Use\n"); + return -EAGAIN; + } + iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH); + if (!iomapadr) { + printk(KERN_NOTICE "Failed to ioremap memory region\n"); + ret = -EIO; + goto out_rel; + } + if (OctProbe() != 0) { + printk(KERN_NOTICE "5066: Octagon Probe Failed, is this an Octagon 5066 SBC?\n"); + iounmap((void *)iomapadr); + ret = -EAGAIN; + goto out_unmap; + } + + // Print out our little header.. + printk("Octagon 5066 SSD IO:0x%x MEM:0x%x-0x%x\n",PAGE_IO,WINDOW_START, + WINDOW_START+WINDOW_LENGTH); + + for (i=0; i<2; i++) { + oct5066_mtd[i] = do_map_probe("cfi_probe", &oct5066_map[i]); + if (!oct5066_mtd[i]) + oct5066_mtd[i] = do_map_probe("jedec", &oct5066_map[i]); + if (!oct5066_mtd[i]) + oct5066_mtd[i] = do_map_probe("map_ram", &oct5066_map[i]); + if (!oct5066_mtd[i]) + oct5066_mtd[i] = do_map_probe("map_rom", &oct5066_map[i]); + if (oct5066_mtd[i]) { + oct5066_mtd[i]->owner = THIS_MODULE; + add_mtd_device(oct5066_mtd[i]); + } + } + + if (!oct5066_mtd[0] && !oct5066_mtd[1]) { + cleanup_oct5066(); + return -ENXIO; + } + + return 0; + + out_unmap: + iounmap((void *)iomapadr); + out_rel: + release_region(PAGE_IO, 1); + return ret; +} + +module_init(init_oct5066); +module_exit(cleanup_oct5066); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jason Gunthorpe <jgg@deltatee.com>, David Woodhouse <dwmw2@infradead.org>"); +MODULE_DESCRIPTION("MTD map driver for Octagon 5066 Single Board Computer"); |