// $Id: vmax301.c,v 1.15 2000/11/27 08:50:22 dwmw2 Exp $ /* ###################################################################### Tempustech VMAX SBC301 MTD Driver. The VMAx 301 is a SBC based on . It comes with three builtin AMD 29F016B flash chips and a socket for SRAM or more flash. Each unit has it's own 8k mapping into a settable region (0xD8000). There are two 8k mappings for each MTD, the first is always set to the lower 8k of the device the second is paged. Writing a 16 bit page value to anywhere in the first 8k will cause the second 8k to page around. To boot the device a bios extension must be installed into the first 8k of flash that is smart enough to copy itself down, page in the rest of itself and begin executing. ##################################################################### */ #include #include #include #include #include #include #include #define WINDOW_START 0xd8000 #define WINDOW_LENGTH 0x2000 #define WINDOW_SHIFT 25 #define WINDOW_MASK 0x1FFF /* Actually we could use two spinlocks, but we'd have to have more private space in the struct map_info. We lose a little performance like this, but we'd probably lose more by having the extra indirection from having one of the map->map_priv fields pointing to yet another private struct. */ static spinlock_t vmax301_spin = SPIN_LOCK_UNLOCKED; static void __vmax301_page(struct map_info *map, unsigned long page) { writew(page, map->map_priv_2 - WINDOW_LENGTH); map->map_priv_1 = page; } static inline void vmax301_page(struct map_info *map, unsigned long ofs) { unsigned long page = (ofs >> WINDOW_SHIFT); if (map->map_priv_1 != page) __vmax301_page(map, page); } static __u8 vmax301_read8(struct map_info *map, unsigned long ofs) { __u8 ret; spin_lock(&vmax301_spin); vmax301_page(map, ofs); ret = readb(map->map_priv_2 + (ofs & WINDOW_MASK)); spin_unlock(&vmax301_spin); return ret; } static __u16 vmax301_read16(struct map_info *map, unsigned long ofs) { __u16 ret; spin_lock(&vmax301_spin); vmax301_page(map, ofs); ret = readw(map->map_priv_2 + (ofs & WINDOW_MASK)); spin_unlock(&vmax301_spin); return ret; } static __u32 vmax301_read32(struct map_info *map, unsigned long ofs) { __u32 ret; spin_lock(&vmax301_spin); vmax301_page(map, ofs); ret = readl(map->map_priv_2 + (ofs & WINDOW_MASK)); spin_unlock(&vmax301_spin); return ret; } static void vmax301_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(&vmax301_spin); vmax301_page(map, from); memcpy_fromio(to, map->map_priv_2 + from, thislen); spin_unlock(&vmax301_spin); to += thislen; from += thislen; len -= thislen; } } static void vmax301_write8(struct map_info *map, __u8 d, unsigned long adr) { spin_lock(&vmax301_spin); vmax301_page(map, adr); writeb(d, map->map_priv_2 + (adr & WINDOW_MASK)); spin_unlock(&vmax301_spin); } static void vmax301_write16(struct map_info *map, __u16 d, unsigned long adr) { spin_lock(&vmax301_spin); vmax301_page(map, adr); writew(d, map->map_priv_2 + (adr & WINDOW_MASK)); spin_unlock(&vmax301_spin); } static void vmax301_write32(struct map_info *map, __u32 d, unsigned long adr) { spin_lock(&vmax301_spin); vmax301_page(map, adr); writel(d, map->map_priv_2 + (adr & WINDOW_MASK)); spin_unlock(&vmax301_spin); } static void vmax301_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(&vmax301_spin); vmax301_page(map, to); memcpy_toio(map->map_priv_2 + to, from, thislen); spin_unlock(&vmax301_spin); to += thislen; from += thislen; len -= thislen; } } static struct map_info vmax_map[2] = { { name: "VMAX301 Internal Flash", size: 3*2*1024*1024, buswidth: 1, read8: vmax301_read8, read16: vmax301_read16, read32: vmax301_read32, copy_from: vmax301_copy_from, write8: vmax301_write8, write16: vmax301_write16, write32: vmax301_write32, copy_to: vmax301_copy_to, map_priv_1: WINDOW_START + WINDOW_LENGTH, map_priv_2: 0xFFFFFFFF }, { name: "VMAX301 Socket", size: 0, buswidth: 1, read8: vmax301_read8, read16: vmax301_read16, read32: vmax301_read32, copy_from: vmax301_copy_from, write8: vmax301_write8, write16: vmax301_write16, write32: vmax301_write32, copy_to: vmax301_copy_to, map_priv_1: WINDOW_START + (3*WINDOW_LENGTH), map_priv_2: 0xFFFFFFFF } }; static struct mtd_info *vmax_mtd[2] = {NULL, NULL}; #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE) #define init_vmax301 init_module #define cleanup_vmax301 cleanup_module #endif static void __exit cleanup_vmax301(void) { int i; for (i=0; i<2; i++) { if (vmax_mtd[i]) { del_mtd_device(vmax_mtd[i]); map_destroy(vmax_mtd[i]); } } iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START); } int __init init_vmax301(void) { int i; unsigned long iomapadr; // Print out our little header.. printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START, WINDOW_START+4*WINDOW_LENGTH); iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4); if (!iomapadr) { printk("Failed to ioremap memory region\n"); return -EIO; } /* Put the address in the map's private data area. We store the actual MTD IO address rather than the address of the first half, because it's used more often. */ vmax_map[0].map_priv_1 = iomapadr + WINDOW_START; vmax_map[1].map_priv_1 = iomapadr + (3*WINDOW_START); for (i=0; i<2; i++) { vmax_mtd[i] = do_cfi_probe(&vmax_map[i]); if (!vmax_mtd[i]) vmax_mtd[i] = do_jedec_probe(&vmax_map[i]); if (!vmax_mtd[i]) vmax_mtd[i] = do_ram_probe(&vmax_map[i]); if (!vmax_mtd[i]) vmax_mtd[i] = do_rom_probe(&vmax_map[i]); if (vmax_mtd[i]) { vmax_mtd[i]->module = THIS_MODULE; add_mtd_device(vmax_mtd[i]); } } if (!vmax_mtd[1] && !vmax_mtd[2]) { iounmap(iomapadr); return -ENXIO; } return 0; } module_init(init_vmax301); module_exit(cleanup_vmax301);