1*09c434b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* linux/drivers/mtd/maps/scx200_docflash.c 31da177e4SLinus Torvalds 41da177e4SLinus Torvalds Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds National Semiconductor SCx200 flash mapped with DOCCS 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/module.h> 101da177e4SLinus Torvalds #include <linux/types.h> 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/init.h> 131da177e4SLinus Torvalds #include <asm/io.h> 141da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 151da177e4SLinus Torvalds #include <linux/mtd/map.h> 161da177e4SLinus Torvalds #include <linux/mtd/partitions.h> 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds #include <linux/pci.h> 191da177e4SLinus Torvalds #include <linux/scx200.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #define NAME "scx200_docflash" 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>"); 241da177e4SLinus Torvalds MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver"); 251da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds static int probe = 0; /* Don't autoprobe */ 281da177e4SLinus Torvalds static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */ 291da177e4SLinus Torvalds static unsigned width = 8; /* Default to 8 bits wide */ 301da177e4SLinus Torvalds static char *flashtype = "cfi_probe"; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds module_param(probe, int, 0); 331da177e4SLinus Torvalds MODULE_PARM_DESC(probe, "Probe for a BIOS mapping"); 341da177e4SLinus Torvalds module_param(size, int, 0); 351da177e4SLinus Torvalds MODULE_PARM_DESC(size, "Size of the flash mapping"); 361da177e4SLinus Torvalds module_param(width, int, 0); 371da177e4SLinus Torvalds MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)"); 381da177e4SLinus Torvalds module_param(flashtype, charp, 0); 391da177e4SLinus Torvalds MODULE_PARM_DESC(flashtype, "Type of MTD probe to do"); 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds static struct resource docmem = { 421da177e4SLinus Torvalds .flags = IORESOURCE_MEM, 431da177e4SLinus Torvalds .name = "NatSemi SCx200 DOCCS Flash", 441da177e4SLinus Torvalds }; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static struct mtd_info *mymtd; 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds static struct mtd_partition partition_info[] = { 491da177e4SLinus Torvalds { 501da177e4SLinus Torvalds .name = "DOCCS Boot kernel", 511da177e4SLinus Torvalds .offset = 0, 521da177e4SLinus Torvalds .size = 0xc0000 531da177e4SLinus Torvalds }, 541da177e4SLinus Torvalds { 551da177e4SLinus Torvalds .name = "DOCCS Low BIOS", 561da177e4SLinus Torvalds .offset = 0xc0000, 571da177e4SLinus Torvalds .size = 0x40000 581da177e4SLinus Torvalds }, 591da177e4SLinus Torvalds { 601da177e4SLinus Torvalds .name = "DOCCS File system", 611da177e4SLinus Torvalds .offset = 0x100000, 621da177e4SLinus Torvalds .size = ~0 /* calculate from flash size */ 631da177e4SLinus Torvalds }, 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds .name = "DOCCS High BIOS", 661da177e4SLinus Torvalds .offset = ~0, /* calculate from flash size */ 671da177e4SLinus Torvalds .size = 0x80000 681da177e4SLinus Torvalds }, 691da177e4SLinus Torvalds }; 7087d10f3cSTobias Klauser #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds static struct map_info scx200_docflash_map = { 731da177e4SLinus Torvalds .name = "NatSemi SCx200 DOCCS Flash", 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds static int __init init_scx200_docflash(void) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds unsigned u; 791da177e4SLinus Torvalds unsigned base; 801da177e4SLinus Torvalds unsigned ctrl; 811da177e4SLinus Torvalds unsigned pmr; 821da177e4SLinus Torvalds struct pci_dev *bridge; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 851da177e4SLinus Torvalds 86dd8e9ed6SAlan Cox if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 871da177e4SLinus Torvalds PCI_DEVICE_ID_NS_SCx200_BRIDGE, 881da177e4SLinus Torvalds NULL)) == NULL) 891da177e4SLinus Torvalds return -ENODEV; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* check that we have found the configuration block */ 92dd8e9ed6SAlan Cox if (!scx200_cb_present()) { 93dd8e9ed6SAlan Cox pci_dev_put(bridge); 941da177e4SLinus Torvalds return -ENODEV; 95dd8e9ed6SAlan Cox } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds if (probe) { 981da177e4SLinus Torvalds /* Try to use the present flash mapping if any */ 991da177e4SLinus Torvalds pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 1001da177e4SLinus Torvalds pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 101dd8e9ed6SAlan Cox pci_dev_put(bridge); 102dd8e9ed6SAlan Cox 1031da177e4SLinus Torvalds pmr = inl(scx200_cb_base + SCx200_PMR); 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds if (base == 0 1061da177e4SLinus Torvalds || (ctrl & 0x07000000) != 0x07000000 1071da177e4SLinus Torvalds || (ctrl & 0x0007ffff) == 0) 1081da177e4SLinus Torvalds return -ENODEV; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds size = ((ctrl&0x1fff)<<13) + (1<<13); 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds for (u = size; u > 1; u >>= 1) 1131da177e4SLinus Torvalds ; 1141da177e4SLinus Torvalds if (u != 1) 1151da177e4SLinus Torvalds return -ENODEV; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds if (pmr & (1<<6)) 1181da177e4SLinus Torvalds width = 16; 1191da177e4SLinus Torvalds else 1201da177e4SLinus Torvalds width = 8; 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds docmem.start = base; 1231da177e4SLinus Torvalds docmem.end = base + size; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds if (request_resource(&iomem_resource, &docmem)) { 1261da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 1271da177e4SLinus Torvalds return -ENOMEM; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds } else { 130dd8e9ed6SAlan Cox pci_dev_put(bridge); 1311da177e4SLinus Torvalds for (u = size; u > 1; u >>= 1) 1321da177e4SLinus Torvalds ; 1331da177e4SLinus Torvalds if (u != 1) { 1341da177e4SLinus Torvalds printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 1351da177e4SLinus Torvalds return -EINVAL; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if (width != 8 && width != 16) { 1391da177e4SLinus Torvalds printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 1401da177e4SLinus Torvalds return -EINVAL; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (allocate_resource(&iomem_resource, &docmem, 1441da177e4SLinus Torvalds size, 1451da177e4SLinus Torvalds 0xc0000000, 0xffffffff, 1461da177e4SLinus Torvalds size, NULL, NULL)) { 1471da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 1481da177e4SLinus Torvalds return -ENOMEM; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds ctrl = 0x07000000 | ((size-1) >> 13); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 1561da177e4SLinus Torvalds pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 1571da177e4SLinus Torvalds pmr = inl(scx200_cb_base + SCx200_PMR); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds if (width == 8) { 1601da177e4SLinus Torvalds pmr &= ~(1<<6); 1611da177e4SLinus Torvalds } else { 1621da177e4SLinus Torvalds pmr |= (1<<6); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds outl(pmr, scx200_cb_base + SCx200_PMR); 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 167f9a5279cSJoe Perches printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n", 168f9a5279cSJoe Perches &docmem, width); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds scx200_docflash_map.size = size; 1711da177e4SLinus Torvalds if (width == 8) 1721da177e4SLinus Torvalds scx200_docflash_map.bankwidth = 1; 1731da177e4SLinus Torvalds else 1741da177e4SLinus Torvalds scx200_docflash_map.bankwidth = 2; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds simple_map_init(&scx200_docflash_map); 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds scx200_docflash_map.phys = docmem.start; 1791da177e4SLinus Torvalds scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 1801da177e4SLinus Torvalds if (!scx200_docflash_map.virt) { 1811da177e4SLinus Torvalds printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 1821da177e4SLinus Torvalds release_resource(&docmem); 1831da177e4SLinus Torvalds return -EIO; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds mymtd = do_map_probe(flashtype, &scx200_docflash_map); 1871da177e4SLinus Torvalds if (!mymtd) { 1881da177e4SLinus Torvalds printk(KERN_ERR NAME ": unable to detect flash\n"); 1891da177e4SLinus Torvalds iounmap(scx200_docflash_map.virt); 1901da177e4SLinus Torvalds release_resource(&docmem); 1911da177e4SLinus Torvalds return -ENXIO; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds if (size < mymtd->size) 1951da177e4SLinus Torvalds printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds mymtd->owner = THIS_MODULE; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds partition_info[3].offset = mymtd->size-partition_info[3].size; 2001da177e4SLinus Torvalds partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 201f6c11c18SJamie Iles mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); 202f6c11c18SJamie Iles 2031da177e4SLinus Torvalds return 0; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds static void __exit cleanup_scx200_docflash(void) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds if (mymtd) { 209f6c11c18SJamie Iles mtd_device_unregister(mymtd); 2101da177e4SLinus Torvalds map_destroy(mymtd); 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds if (scx200_docflash_map.virt) { 2131da177e4SLinus Torvalds iounmap(scx200_docflash_map.virt); 2141da177e4SLinus Torvalds release_resource(&docmem); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds module_init(init_scx200_docflash); 2191da177e4SLinus Torvalds module_exit(cleanup_scx200_docflash); 220