11da177e4SLinus Torvalds /* linux/drivers/mtd/maps/scx200_docflash.c 21da177e4SLinus Torvalds 31da177e4SLinus Torvalds Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds National Semiconductor SCx200 flash mapped with DOCCS 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/module.h> 91da177e4SLinus Torvalds #include <linux/types.h> 101da177e4SLinus Torvalds #include <linux/kernel.h> 111da177e4SLinus Torvalds #include <linux/init.h> 121da177e4SLinus Torvalds #include <asm/io.h> 131da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 141da177e4SLinus Torvalds #include <linux/mtd/map.h> 151da177e4SLinus Torvalds #include <linux/mtd/partitions.h> 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/pci.h> 181da177e4SLinus Torvalds #include <linux/scx200.h> 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #define NAME "scx200_docflash" 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>"); 231da177e4SLinus Torvalds MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver"); 241da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds static int probe = 0; /* Don't autoprobe */ 271da177e4SLinus Torvalds static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */ 281da177e4SLinus Torvalds static unsigned width = 8; /* Default to 8 bits wide */ 291da177e4SLinus Torvalds static char *flashtype = "cfi_probe"; 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds module_param(probe, int, 0); 321da177e4SLinus Torvalds MODULE_PARM_DESC(probe, "Probe for a BIOS mapping"); 331da177e4SLinus Torvalds module_param(size, int, 0); 341da177e4SLinus Torvalds MODULE_PARM_DESC(size, "Size of the flash mapping"); 351da177e4SLinus Torvalds module_param(width, int, 0); 361da177e4SLinus Torvalds MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)"); 371da177e4SLinus Torvalds module_param(flashtype, charp, 0); 381da177e4SLinus Torvalds MODULE_PARM_DESC(flashtype, "Type of MTD probe to do"); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static struct resource docmem = { 411da177e4SLinus Torvalds .flags = IORESOURCE_MEM, 421da177e4SLinus Torvalds .name = "NatSemi SCx200 DOCCS Flash", 431da177e4SLinus Torvalds }; 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds static struct mtd_info *mymtd; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static struct mtd_partition partition_info[] = { 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds .name = "DOCCS Boot kernel", 501da177e4SLinus Torvalds .offset = 0, 511da177e4SLinus Torvalds .size = 0xc0000 521da177e4SLinus Torvalds }, 531da177e4SLinus Torvalds { 541da177e4SLinus Torvalds .name = "DOCCS Low BIOS", 551da177e4SLinus Torvalds .offset = 0xc0000, 561da177e4SLinus Torvalds .size = 0x40000 571da177e4SLinus Torvalds }, 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds .name = "DOCCS File system", 601da177e4SLinus Torvalds .offset = 0x100000, 611da177e4SLinus Torvalds .size = ~0 /* calculate from flash size */ 621da177e4SLinus Torvalds }, 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds .name = "DOCCS High BIOS", 651da177e4SLinus Torvalds .offset = ~0, /* calculate from flash size */ 661da177e4SLinus Torvalds .size = 0x80000 671da177e4SLinus Torvalds }, 681da177e4SLinus Torvalds }; 6987d10f3cSTobias Klauser #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds static struct map_info scx200_docflash_map = { 721da177e4SLinus Torvalds .name = "NatSemi SCx200 DOCCS Flash", 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static int __init init_scx200_docflash(void) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds unsigned u; 781da177e4SLinus Torvalds unsigned base; 791da177e4SLinus Torvalds unsigned ctrl; 801da177e4SLinus Torvalds unsigned pmr; 811da177e4SLinus Torvalds struct pci_dev *bridge; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 841da177e4SLinus Torvalds 85dd8e9ed6SAlan Cox if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 861da177e4SLinus Torvalds PCI_DEVICE_ID_NS_SCx200_BRIDGE, 871da177e4SLinus Torvalds NULL)) == NULL) 881da177e4SLinus Torvalds return -ENODEV; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* check that we have found the configuration block */ 91dd8e9ed6SAlan Cox if (!scx200_cb_present()) { 92dd8e9ed6SAlan Cox pci_dev_put(bridge); 931da177e4SLinus Torvalds return -ENODEV; 94dd8e9ed6SAlan Cox } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds if (probe) { 971da177e4SLinus Torvalds /* Try to use the present flash mapping if any */ 981da177e4SLinus Torvalds pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 991da177e4SLinus Torvalds pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 100dd8e9ed6SAlan Cox pci_dev_put(bridge); 101dd8e9ed6SAlan Cox 1021da177e4SLinus Torvalds pmr = inl(scx200_cb_base + SCx200_PMR); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds if (base == 0 1051da177e4SLinus Torvalds || (ctrl & 0x07000000) != 0x07000000 1061da177e4SLinus Torvalds || (ctrl & 0x0007ffff) == 0) 1071da177e4SLinus Torvalds return -ENODEV; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds size = ((ctrl&0x1fff)<<13) + (1<<13); 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds for (u = size; u > 1; u >>= 1) 1121da177e4SLinus Torvalds ; 1131da177e4SLinus Torvalds if (u != 1) 1141da177e4SLinus Torvalds return -ENODEV; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds if (pmr & (1<<6)) 1171da177e4SLinus Torvalds width = 16; 1181da177e4SLinus Torvalds else 1191da177e4SLinus Torvalds width = 8; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds docmem.start = base; 1221da177e4SLinus Torvalds docmem.end = base + size; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds if (request_resource(&iomem_resource, &docmem)) { 1251da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 1261da177e4SLinus Torvalds return -ENOMEM; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds } else { 129dd8e9ed6SAlan Cox pci_dev_put(bridge); 1301da177e4SLinus Torvalds for (u = size; u > 1; u >>= 1) 1311da177e4SLinus Torvalds ; 1321da177e4SLinus Torvalds if (u != 1) { 1331da177e4SLinus Torvalds printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 1341da177e4SLinus Torvalds return -EINVAL; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds if (width != 8 && width != 16) { 1381da177e4SLinus Torvalds printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 1391da177e4SLinus Torvalds return -EINVAL; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (allocate_resource(&iomem_resource, &docmem, 1431da177e4SLinus Torvalds size, 1441da177e4SLinus Torvalds 0xc0000000, 0xffffffff, 1451da177e4SLinus Torvalds size, NULL, NULL)) { 1461da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 1471da177e4SLinus Torvalds return -ENOMEM; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds ctrl = 0x07000000 | ((size-1) >> 13); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 1551da177e4SLinus Torvalds pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 1561da177e4SLinus Torvalds pmr = inl(scx200_cb_base + SCx200_PMR); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds if (width == 8) { 1591da177e4SLinus Torvalds pmr &= ~(1<<6); 1601da177e4SLinus Torvalds } else { 1611da177e4SLinus Torvalds pmr |= (1<<6); 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds outl(pmr, scx200_cb_base + SCx200_PMR); 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 166f9a5279cSJoe Perches printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n", 167f9a5279cSJoe Perches &docmem, width); 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds scx200_docflash_map.size = size; 1701da177e4SLinus Torvalds if (width == 8) 1711da177e4SLinus Torvalds scx200_docflash_map.bankwidth = 1; 1721da177e4SLinus Torvalds else 1731da177e4SLinus Torvalds scx200_docflash_map.bankwidth = 2; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds simple_map_init(&scx200_docflash_map); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds scx200_docflash_map.phys = docmem.start; 1781da177e4SLinus Torvalds scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 1791da177e4SLinus Torvalds if (!scx200_docflash_map.virt) { 1801da177e4SLinus Torvalds printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 1811da177e4SLinus Torvalds release_resource(&docmem); 1821da177e4SLinus Torvalds return -EIO; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds mymtd = do_map_probe(flashtype, &scx200_docflash_map); 1861da177e4SLinus Torvalds if (!mymtd) { 1871da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to detect flash\n"); 1881da177e4SLinus Torvalds iounmap(scx200_docflash_map.virt); 1891da177e4SLinus Torvalds release_resource(&docmem); 1901da177e4SLinus Torvalds return -ENXIO; 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds if (size < mymtd->size) 1941da177e4SLinus Torvalds printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds mymtd->owner = THIS_MODULE; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds partition_info[3].offset = mymtd->size-partition_info[3].size; 1991da177e4SLinus Torvalds partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 200*f6c11c18SJamie Iles mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); 201*f6c11c18SJamie Iles 2021da177e4SLinus Torvalds return 0; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds static void __exit cleanup_scx200_docflash(void) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds if (mymtd) { 208*f6c11c18SJamie Iles mtd_device_unregister(mymtd); 2091da177e4SLinus Torvalds map_destroy(mymtd); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds if (scx200_docflash_map.virt) { 2121da177e4SLinus Torvalds iounmap(scx200_docflash_map.virt); 2131da177e4SLinus Torvalds release_resource(&docmem); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds module_init(init_scx200_docflash); 2181da177e4SLinus Torvalds module_exit(cleanup_scx200_docflash); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds Local variables: 2221da177e4SLinus Torvalds compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules" 2231da177e4SLinus Torvalds c-basic-offset: 8 2241da177e4SLinus Torvalds End: 2251da177e4SLinus Torvalds */ 226