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Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
199 lines
5.3 KiB
C
199 lines
5.3 KiB
C
// $Id: vmax301.c,v 1.30 2004/07/12 22:38:29 dwmw2 Exp $
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/* ######################################################################
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Tempustech VMAX SBC301 MTD Driver.
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The VMAx 301 is a SBC based on . It
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comes with three builtin AMD 29F016B flash chips and a socket for SRAM or
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more flash. Each unit has it's own 8k mapping into a settable region
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(0xD8000). There are two 8k mappings for each MTD, the first is always set
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to the lower 8k of the device the second is paged. Writing a 16 bit page
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value to anywhere in the first 8k will cause the second 8k to page around.
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To boot the device a bios extension must be installed into the first 8k
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of flash that is smart enough to copy itself down, page in the rest of
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itself and begin executing.
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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 <linux/spinlock.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 0xd8000
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#define WINDOW_LENGTH 0x2000
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#define WINDOW_SHIFT 25
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#define WINDOW_MASK 0x1FFF
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/* Actually we could use two spinlocks, but we'd have to have
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more private space in the struct map_info. We lose a little
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performance like this, but we'd probably lose more by having
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the extra indirection from having one of the map->map_priv
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fields pointing to yet another private struct.
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*/
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static DEFINE_SPINLOCK(vmax301_spin);
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static void __vmax301_page(struct map_info *map, unsigned long page)
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{
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writew(page, map->map_priv_2 - WINDOW_LENGTH);
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map->map_priv_1 = page;
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}
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static inline void vmax301_page(struct map_info *map,
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unsigned long ofs)
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{
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unsigned long page = (ofs >> WINDOW_SHIFT);
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if (map->map_priv_1 != page)
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__vmax301_page(map, page);
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}
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static map_word vmax301_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(&vmax301_spin);
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vmax301_page(map, ofs);
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ret.x[0] = readb(map->map_priv_2 + (ofs & WINDOW_MASK));
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spin_unlock(&vmax301_spin);
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return ret;
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}
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static void vmax301_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(&vmax301_spin);
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vmax301_page(map, from);
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memcpy_fromio(to, map->map_priv_2 + from, thislen);
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spin_unlock(&vmax301_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 vmax301_write8(struct map_info *map, map_word d, unsigned long adr)
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{
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spin_lock(&vmax301_spin);
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vmax301_page(map, adr);
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writeb(d.x[0], map->map_priv_2 + (adr & WINDOW_MASK));
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spin_unlock(&vmax301_spin);
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}
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static void vmax301_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(&vmax301_spin);
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vmax301_page(map, to);
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memcpy_toio(map->map_priv_2 + to, from, thislen);
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spin_unlock(&vmax301_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 vmax_map[2] = {
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{
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.name = "VMAX301 Internal Flash",
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.phys = NO_XIP,
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.size = 3*2*1024*1024,
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.bankwidth = 1,
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.read = vmax301_read8,
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.copy_from = vmax301_copy_from,
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.write = vmax301_write8,
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.copy_to = vmax301_copy_to,
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.map_priv_1 = WINDOW_START + WINDOW_LENGTH,
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.map_priv_2 = 0xFFFFFFFF
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},
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{
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.name = "VMAX301 Socket",
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.phys = NO_XIP,
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.size = 0,
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.bankwidth = 1,
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.read = vmax301_read8,
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.copy_from = vmax301_copy_from,
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.write = vmax301_write8,
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.copy_to = vmax301_copy_to,
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.map_priv_1 = WINDOW_START + (3*WINDOW_LENGTH),
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.map_priv_2 = 0xFFFFFFFF
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}
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};
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static struct mtd_info *vmax_mtd[2] = {NULL, NULL};
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static void __exit cleanup_vmax301(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 (vmax_mtd[i]) {
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del_mtd_device(vmax_mtd[i]);
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map_destroy(vmax_mtd[i]);
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}
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}
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iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START);
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}
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int __init init_vmax301(void)
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{
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int i;
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unsigned long iomapadr;
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// Print out our little header..
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printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START,
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WINDOW_START+4*WINDOW_LENGTH);
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iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4);
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if (!iomapadr) {
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printk("Failed to ioremap memory region\n");
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return -EIO;
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}
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/* Put the address in the map's private data area.
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We store the actual MTD IO address rather than the
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address of the first half, because it's used more
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often.
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*/
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vmax_map[0].map_priv_2 = iomapadr + WINDOW_START;
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vmax_map[1].map_priv_2 = iomapadr + (3*WINDOW_START);
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for (i=0; i<2; i++) {
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vmax_mtd[i] = do_map_probe("cfi_probe", &vmax_map[i]);
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if (!vmax_mtd[i])
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vmax_mtd[i] = do_map_probe("jedec", &vmax_map[i]);
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if (!vmax_mtd[i])
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vmax_mtd[i] = do_map_probe("map_ram", &vmax_map[i]);
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if (!vmax_mtd[i])
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vmax_mtd[i] = do_map_probe("map_rom", &vmax_map[i]);
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if (vmax_mtd[i]) {
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vmax_mtd[i]->owner = THIS_MODULE;
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add_mtd_device(vmax_mtd[i]);
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}
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}
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if (!vmax_mtd[1] && !vmax_mtd[2]) {
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iounmap((void *)iomapadr);
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return -ENXIO;
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}
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return 0;
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}
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module_init(init_vmax301);
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module_exit(cleanup_vmax301);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("MTD map driver for Tempustech VMAX SBC301 board");
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