11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * MTD map driver for flash on the DC21285 (the StrongARM-110 companion chip) 31da177e4SLinus Torvalds * 42f82af08SNicolas Pitre * (C) 2000 Nicolas Pitre <nico@fluxnic.net> 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This code is GPL 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 <linux/delay.h> 134e57b681STim Schmielau #include <linux/slab.h> 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 161da177e4SLinus Torvalds #include <linux/mtd/map.h> 171da177e4SLinus Torvalds #include <linux/mtd/partitions.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <asm/io.h> 201da177e4SLinus Torvalds #include <asm/hardware/dec21285.h> 211da177e4SLinus Torvalds #include <asm/mach-types.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds static struct mtd_info *dc21285_mtd; 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #ifdef CONFIG_ARCH_NETWINDER 271da177e4SLinus Torvalds /* 281da177e4SLinus Torvalds * This is really ugly, but it seams to be the only 291da177e4SLinus Torvalds * realiable way to do it, as the cpld state machine 301da177e4SLinus Torvalds * is unpredictible. So we have a 25us penalty per 311da177e4SLinus Torvalds * write access. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds static void nw_en_write(void) 341da177e4SLinus Torvalds { 351da177e4SLinus Torvalds unsigned long flags; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds /* 381da177e4SLinus Torvalds * we want to write a bit pattern XXX1 to Xilinx to enable 391da177e4SLinus Torvalds * the write gate, which will be open for about the next 2ms. 401da177e4SLinus Torvalds */ 4170d13e08SRussell King spin_lock_irqsave(&nw_gpio_lock, flags); 4270d13e08SRussell King nw_cpld_modify(CPLD_FLASH_WR_ENABLE, CPLD_FLASH_WR_ENABLE); 4370d13e08SRussell King spin_unlock_irqrestore(&nw_gpio_lock, flags); 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* 461da177e4SLinus Torvalds * let the ISA bus to catch on... 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds udelay(25); 491da177e4SLinus Torvalds } 501da177e4SLinus Torvalds #else 511da177e4SLinus Torvalds #define nw_en_write() do { } while (0) 521da177e4SLinus Torvalds #endif 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static map_word dc21285_read8(struct map_info *map, unsigned long ofs) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds map_word val; 571da177e4SLinus Torvalds val.x[0] = *(uint8_t*)(map->virt + ofs); 581da177e4SLinus Torvalds return val; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds static map_word dc21285_read16(struct map_info *map, unsigned long ofs) 621da177e4SLinus Torvalds { 631da177e4SLinus Torvalds map_word val; 641da177e4SLinus Torvalds val.x[0] = *(uint16_t*)(map->virt + ofs); 651da177e4SLinus Torvalds return val; 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds static map_word dc21285_read32(struct map_info *map, unsigned long ofs) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds map_word val; 711da177e4SLinus Torvalds val.x[0] = *(uint32_t*)(map->virt + ofs); 721da177e4SLinus Torvalds return val; 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static void dc21285_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds memcpy(to, (void*)(map->virt + from), len); 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds static void dc21285_write8(struct map_info *map, const map_word d, unsigned long adr) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds if (machine_is_netwinder()) 831da177e4SLinus Torvalds nw_en_write(); 841da177e4SLinus Torvalds *CSR_ROMWRITEREG = adr & 3; 851da177e4SLinus Torvalds adr &= ~3; 861da177e4SLinus Torvalds *(uint8_t*)(map->virt + adr) = d.x[0]; 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds static void dc21285_write16(struct map_info *map, const map_word d, unsigned long adr) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds if (machine_is_netwinder()) 921da177e4SLinus Torvalds nw_en_write(); 931da177e4SLinus Torvalds *CSR_ROMWRITEREG = adr & 3; 941da177e4SLinus Torvalds adr &= ~3; 951da177e4SLinus Torvalds *(uint16_t*)(map->virt + adr) = d.x[0]; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds static void dc21285_write32(struct map_info *map, const map_word d, unsigned long adr) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds if (machine_is_netwinder()) 1011da177e4SLinus Torvalds nw_en_write(); 1021da177e4SLinus Torvalds *(uint32_t*)(map->virt + adr) = d.x[0]; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static void dc21285_copy_to_32(struct map_info *map, unsigned long to, const void *from, ssize_t len) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds while (len > 0) { 1081da177e4SLinus Torvalds map_word d; 10975b84e94SMartin Michlmayr d.x[0] = *((uint32_t*)from); 1101da177e4SLinus Torvalds dc21285_write32(map, d, to); 11175b84e94SMartin Michlmayr from += 4; 1121da177e4SLinus Torvalds to += 4; 1131da177e4SLinus Torvalds len -= 4; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds static void dc21285_copy_to_16(struct map_info *map, unsigned long to, const void *from, ssize_t len) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds while (len > 0) { 1201da177e4SLinus Torvalds map_word d; 12175b84e94SMartin Michlmayr d.x[0] = *((uint16_t*)from); 1221da177e4SLinus Torvalds dc21285_write16(map, d, to); 12375b84e94SMartin Michlmayr from += 2; 1241da177e4SLinus Torvalds to += 2; 1251da177e4SLinus Torvalds len -= 2; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds static void dc21285_copy_to_8(struct map_info *map, unsigned long to, const void *from, ssize_t len) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds map_word d; 13275b84e94SMartin Michlmayr d.x[0] = *((uint8_t*)from); 1331da177e4SLinus Torvalds dc21285_write8(map, d, to); 13475b84e94SMartin Michlmayr from++; 1351da177e4SLinus Torvalds to++; 1361da177e4SLinus Torvalds len--; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static struct map_info dc21285_map = { 1401da177e4SLinus Torvalds .name = "DC21285 flash", 1411da177e4SLinus Torvalds .phys = NO_XIP, 1421da177e4SLinus Torvalds .size = 16*1024*1024, 1431da177e4SLinus Torvalds .copy_from = dc21285_copy_from, 1441da177e4SLinus Torvalds }; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds /* Partition stuff */ 1481da177e4SLinus Torvalds #ifdef CONFIG_MTD_PARTITIONS 1491da177e4SLinus Torvalds static struct mtd_partition *dc21285_parts; 1501da177e4SLinus Torvalds static const char *probes[] = { "RedBoot", "cmdlinepart", NULL }; 1511da177e4SLinus Torvalds #endif 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds static int __init init_dc21285(void) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds #ifdef CONFIG_MTD_PARTITIONS 1571da177e4SLinus Torvalds int nrparts; 1581da177e4SLinus Torvalds #endif 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds /* Determine bankwidth */ 1611da177e4SLinus Torvalds switch (*CSR_SA110_CNTL & (3<<14)) { 1621da177e4SLinus Torvalds case SA110_CNTL_ROMWIDTH_8: 1631da177e4SLinus Torvalds dc21285_map.bankwidth = 1; 1641da177e4SLinus Torvalds dc21285_map.read = dc21285_read8; 1651da177e4SLinus Torvalds dc21285_map.write = dc21285_write8; 1661da177e4SLinus Torvalds dc21285_map.copy_to = dc21285_copy_to_8; 1671da177e4SLinus Torvalds break; 1681da177e4SLinus Torvalds case SA110_CNTL_ROMWIDTH_16: 1691da177e4SLinus Torvalds dc21285_map.bankwidth = 2; 1701da177e4SLinus Torvalds dc21285_map.read = dc21285_read16; 1711da177e4SLinus Torvalds dc21285_map.write = dc21285_write16; 1721da177e4SLinus Torvalds dc21285_map.copy_to = dc21285_copy_to_16; 1731da177e4SLinus Torvalds break; 1741da177e4SLinus Torvalds case SA110_CNTL_ROMWIDTH_32: 1751da177e4SLinus Torvalds dc21285_map.bankwidth = 4; 1761da177e4SLinus Torvalds dc21285_map.read = dc21285_read32; 1771da177e4SLinus Torvalds dc21285_map.write = dc21285_write32; 1781da177e4SLinus Torvalds dc21285_map.copy_to = dc21285_copy_to_32; 1791da177e4SLinus Torvalds break; 1801da177e4SLinus Torvalds default: 1811da177e4SLinus Torvalds printk (KERN_ERR "DC21285 flash: undefined bankwidth\n"); 1821da177e4SLinus Torvalds return -ENXIO; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds printk (KERN_NOTICE "DC21285 flash support (%d-bit bankwidth)\n", 1851da177e4SLinus Torvalds dc21285_map.bankwidth*8); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* Let's map the flash area */ 1881da177e4SLinus Torvalds dc21285_map.virt = ioremap(DC21285_FLASH, 16*1024*1024); 1891da177e4SLinus Torvalds if (!dc21285_map.virt) { 1901da177e4SLinus Torvalds printk("Failed to ioremap\n"); 1911da177e4SLinus Torvalds return -EIO; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds if (machine_is_ebsa285()) { 1951da177e4SLinus Torvalds dc21285_mtd = do_map_probe("cfi_probe", &dc21285_map); 1961da177e4SLinus Torvalds } else { 1971da177e4SLinus Torvalds dc21285_mtd = do_map_probe("jedec_probe", &dc21285_map); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds if (!dc21285_mtd) { 2011da177e4SLinus Torvalds iounmap(dc21285_map.virt); 2021da177e4SLinus Torvalds return -ENXIO; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds dc21285_mtd->owner = THIS_MODULE; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds #ifdef CONFIG_MTD_PARTITIONS 2081da177e4SLinus Torvalds nrparts = parse_mtd_partitions(dc21285_mtd, probes, &dc21285_parts, 0); 2091da177e4SLinus Torvalds if (nrparts > 0) 2101da177e4SLinus Torvalds add_mtd_partitions(dc21285_mtd, dc21285_parts, nrparts); 2111da177e4SLinus Torvalds else 2121da177e4SLinus Torvalds #endif 2131da177e4SLinus Torvalds add_mtd_device(dc21285_mtd); 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds if(machine_is_ebsa285()) { 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * Flash timing is determined with bits 19-16 of the 2181da177e4SLinus Torvalds * CSR_SA110_CNTL. The value is the number of wait cycles, or 2191da177e4SLinus Torvalds * 0 for 16 cycles (the default). Cycles are 20 ns. 2201da177e4SLinus Torvalds * Here we use 7 for 140 ns flash chips. 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds /* access time */ 2231da177e4SLinus Torvalds *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x000f0000) | (7 << 16)); 2241da177e4SLinus Torvalds /* burst time */ 2251da177e4SLinus Torvalds *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x00f00000) | (7 << 20)); 2261da177e4SLinus Torvalds /* tristate time */ 2271da177e4SLinus Torvalds *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x0f000000) | (7 << 24)); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds return 0; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds static void __exit cleanup_dc21285(void) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds #ifdef CONFIG_MTD_PARTITIONS 2361da177e4SLinus Torvalds if (dc21285_parts) { 2371da177e4SLinus Torvalds del_mtd_partitions(dc21285_mtd); 2381da177e4SLinus Torvalds kfree(dc21285_parts); 2391da177e4SLinus Torvalds } else 2401da177e4SLinus Torvalds #endif 2411da177e4SLinus Torvalds del_mtd_device(dc21285_mtd); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds map_destroy(dc21285_mtd); 2441da177e4SLinus Torvalds iounmap(dc21285_map.virt); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds module_init(init_dc21285); 2481da177e4SLinus Torvalds module_exit(cleanup_dc21285); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2522f82af08SNicolas Pitre MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>"); 2531da177e4SLinus Torvalds MODULE_DESCRIPTION("MTD map driver for DC21285 boards"); 254