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248 lines
6.3 KiB
C
248 lines
6.3 KiB
C
// $Id: octagon-5066.c,v 1.28 2005/11/07 11:14:27 gleixner Exp $
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/* ######################################################################
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Octagon 5066 MTD Driver.
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The Octagon 5066 is a SBC based on AMD's 586-WB running at 133 MHZ. It
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comes with a builtin AMD 29F016 flash chip and a socketed EEPROM that
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is replacable by flash. Both units are mapped through a multiplexer
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into a 32k memory window at 0xe8000. The control register for the
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multiplexing unit is located at IO 0x208 with a bit map of
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0-5 Page Selection in 32k increments
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6-7 Device selection:
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00 SSD off
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01 SSD 0 (Socket)
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10 SSD 1 (Flash chip)
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11 undefined
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On each SSD, the first 128k is reserved for use by the bios
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(actually it IS the bios..) This only matters if you are booting off the
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flash, you must not put a file system starting there.
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The driver tries to do a detection algorithm to guess what sort of devices
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are plugged into the sockets.
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##################################################################### */
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/mtd.h>
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#define WINDOW_START 0xe8000
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#define WINDOW_LENGTH 0x8000
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#define WINDOW_SHIFT 27
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#define WINDOW_MASK 0x7FFF
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#define PAGE_IO 0x208
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static volatile char page_n_dev = 0;
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static unsigned long iomapadr;
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static DEFINE_SPINLOCK(oct5066_spin);
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/*
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* We use map_priv_1 to identify which device we are.
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*/
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static void __oct5066_page(struct map_info *map, __u8 byte)
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{
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outb(byte,PAGE_IO);
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page_n_dev = byte;
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}
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static inline void oct5066_page(struct map_info *map, unsigned long ofs)
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{
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__u8 byte = map->map_priv_1 | (ofs >> WINDOW_SHIFT);
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if (page_n_dev != byte)
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__oct5066_page(map, byte);
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}
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static map_word oct5066_read8(struct map_info *map, unsigned long ofs)
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{
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map_word ret;
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spin_lock(&oct5066_spin);
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oct5066_page(map, ofs);
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ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
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spin_unlock(&oct5066_spin);
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return ret;
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}
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static void oct5066_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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while(len) {
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unsigned long thislen = len;
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if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
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thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
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spin_lock(&oct5066_spin);
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oct5066_page(map, from);
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memcpy_fromio(to, iomapadr + from, thislen);
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spin_unlock(&oct5066_spin);
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to += thislen;
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from += thislen;
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len -= thislen;
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}
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}
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static void oct5066_write8(struct map_info *map, map_word d, unsigned long adr)
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{
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spin_lock(&oct5066_spin);
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oct5066_page(map, adr);
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writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
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spin_unlock(&oct5066_spin);
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}
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static void oct5066_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
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{
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while(len) {
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unsigned long thislen = len;
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if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
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thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
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spin_lock(&oct5066_spin);
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oct5066_page(map, to);
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memcpy_toio(iomapadr + to, from, thislen);
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spin_unlock(&oct5066_spin);
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to += thislen;
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from += thislen;
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len -= thislen;
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}
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}
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static struct map_info oct5066_map[2] = {
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{
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.name = "Octagon 5066 Socket",
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.phys = NO_XIP,
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.size = 512 * 1024,
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.bankwidth = 1,
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.read = oct5066_read8,
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.copy_from = oct5066_copy_from,
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.write = oct5066_write8,
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.copy_to = oct5066_copy_to,
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.map_priv_1 = 1<<6
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},
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{
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.name = "Octagon 5066 Internal Flash",
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.phys = NO_XIP,
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.size = 2 * 1024 * 1024,
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.bankwidth = 1,
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.read = oct5066_read8,
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.copy_from = oct5066_copy_from,
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.write = oct5066_write8,
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.copy_to = oct5066_copy_to,
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.map_priv_1 = 2<<6
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}
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};
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static struct mtd_info *oct5066_mtd[2] = {NULL, NULL};
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// OctProbe - Sense if this is an octagon card
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// ---------------------------------------------------------------------
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/* Perform a simple validity test, we map the window select SSD0 and
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change pages while monitoring the window. A change in the window,
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controlled by the PAGE_IO port is a functioning 5066 board. This will
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fail if the thing in the socket is set to a uniform value. */
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static int __init OctProbe(void)
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{
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unsigned int Base = (1 << 6);
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unsigned long I;
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unsigned long Values[10];
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for (I = 0; I != 20; I++)
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{
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outb(Base + (I%10),PAGE_IO);
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if (I < 10)
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{
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// Record the value and check for uniqueness
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Values[I%10] = readl(iomapadr);
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if (I > 0 && Values[I%10] == Values[0])
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return -EAGAIN;
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}
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else
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{
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// Make sure we get the same values on the second pass
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if (Values[I%10] != readl(iomapadr))
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return -EAGAIN;
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}
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}
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return 0;
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}
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void cleanup_oct5066(void)
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{
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int i;
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for (i=0; i<2; i++) {
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if (oct5066_mtd[i]) {
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del_mtd_device(oct5066_mtd[i]);
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map_destroy(oct5066_mtd[i]);
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}
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}
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iounmap((void *)iomapadr);
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release_region(PAGE_IO, 1);
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}
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int __init init_oct5066(void)
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{
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int i;
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int ret = 0;
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// Do an autoprobe sequence
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if (!request_region(PAGE_IO,1,"Octagon SSD")) {
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printk(KERN_NOTICE "5066: Page Register in Use\n");
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return -EAGAIN;
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}
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iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);
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if (!iomapadr) {
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printk(KERN_NOTICE "Failed to ioremap memory region\n");
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ret = -EIO;
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goto out_rel;
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}
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if (OctProbe() != 0) {
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printk(KERN_NOTICE "5066: Octagon Probe Failed, is this an Octagon 5066 SBC?\n");
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iounmap((void *)iomapadr);
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ret = -EAGAIN;
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goto out_unmap;
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}
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// Print out our little header..
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printk("Octagon 5066 SSD IO:0x%x MEM:0x%x-0x%x\n",PAGE_IO,WINDOW_START,
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WINDOW_START+WINDOW_LENGTH);
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for (i=0; i<2; i++) {
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oct5066_mtd[i] = do_map_probe("cfi_probe", &oct5066_map[i]);
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if (!oct5066_mtd[i])
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oct5066_mtd[i] = do_map_probe("jedec", &oct5066_map[i]);
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if (!oct5066_mtd[i])
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oct5066_mtd[i] = do_map_probe("map_ram", &oct5066_map[i]);
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if (!oct5066_mtd[i])
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oct5066_mtd[i] = do_map_probe("map_rom", &oct5066_map[i]);
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if (oct5066_mtd[i]) {
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oct5066_mtd[i]->owner = THIS_MODULE;
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add_mtd_device(oct5066_mtd[i]);
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}
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}
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if (!oct5066_mtd[0] && !oct5066_mtd[1]) {
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cleanup_oct5066();
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return -ENXIO;
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}
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return 0;
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out_unmap:
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iounmap((void *)iomapadr);
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out_rel:
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release_region(PAGE_IO, 1);
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return ret;
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}
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module_init(init_oct5066);
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module_exit(cleanup_oct5066);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jason Gunthorpe <jgg@deltatee.com>, David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("MTD map driver for Octagon 5066 Single Board Computer");
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