1 /* 2 * Octeon Bootbus flash setup 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2007, 2008 Cavium Networks 9 */ 10 #include <linux/kernel.h> 11 #include <linux/mtd/mtd.h> 12 #include <linux/mtd/map.h> 13 #include <linux/mtd/partitions.h> 14 15 #include <asm/octeon/octeon.h> 16 17 static struct map_info flash_map; 18 static struct mtd_info *mymtd; 19 static int nr_parts; 20 static struct mtd_partition *parts; 21 static const char *part_probe_types[] = { 22 "cmdlinepart", 23 #ifdef CONFIG_MTD_REDBOOT_PARTS 24 "RedBoot", 25 #endif 26 NULL 27 }; 28 29 /** 30 * Module/ driver initialization. 31 * 32 * Returns Zero on success 33 */ 34 static int __init flash_init(void) 35 { 36 /* 37 * Read the bootbus region 0 setup to determine the base 38 * address of the flash. 39 */ 40 union cvmx_mio_boot_reg_cfgx region_cfg; 41 region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0)); 42 if (region_cfg.s.en) { 43 /* 44 * The bootloader always takes the flash and sets its 45 * address so the entire flash fits below 46 * 0x1fc00000. This way the flash aliases to 47 * 0x1fc00000 for booting. Software can access the 48 * full flash at the true address, while core boot can 49 * access 4MB. 50 */ 51 /* Use this name so old part lines work */ 52 flash_map.name = "phys_mapped_flash"; 53 flash_map.phys = region_cfg.s.base << 16; 54 flash_map.size = 0x1fc00000 - flash_map.phys; 55 flash_map.bankwidth = 1; 56 flash_map.virt = ioremap(flash_map.phys, flash_map.size); 57 pr_notice("Bootbus flash: Setting flash for %luMB flash at " 58 "0x%08llx\n", flash_map.size >> 20, flash_map.phys); 59 simple_map_init(&flash_map); 60 mymtd = do_map_probe("cfi_probe", &flash_map); 61 if (mymtd) { 62 mymtd->owner = THIS_MODULE; 63 64 nr_parts = parse_mtd_partitions(mymtd, 65 part_probe_types, 66 &parts, 0); 67 mtd_device_register(mymtd, parts, nr_parts); 68 } else { 69 pr_err("Failed to register MTD device for flash\n"); 70 } 71 } 72 return 0; 73 } 74 75 late_initcall(flash_init); 76