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/export.h> 12 #include <linux/mtd/mtd.h> 13 #include <linux/mtd/map.h> 14 #include <linux/mtd/partitions.h> 15 16 #include <asm/octeon/octeon.h> 17 18 static struct map_info flash_map; 19 static struct mtd_info *mymtd; 20 static int nr_parts; 21 static struct mtd_partition *parts; 22 static const char *part_probe_types[] = { 23 "cmdlinepart", 24 #ifdef CONFIG_MTD_REDBOOT_PARTS 25 "RedBoot", 26 #endif 27 NULL 28 }; 29 30 /** 31 * Module/ driver initialization. 32 * 33 * Returns Zero on success 34 */ 35 static int __init flash_init(void) 36 { 37 /* 38 * Read the bootbus region 0 setup to determine the base 39 * address of the flash. 40 */ 41 union cvmx_mio_boot_reg_cfgx region_cfg; 42 region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0)); 43 if (region_cfg.s.en) { 44 /* 45 * The bootloader always takes the flash and sets its 46 * address so the entire flash fits below 47 * 0x1fc00000. This way the flash aliases to 48 * 0x1fc00000 for booting. Software can access the 49 * full flash at the true address, while core boot can 50 * access 4MB. 51 */ 52 /* Use this name so old part lines work */ 53 flash_map.name = "phys_mapped_flash"; 54 flash_map.phys = region_cfg.s.base << 16; 55 flash_map.size = 0x1fc00000 - flash_map.phys; 56 flash_map.bankwidth = 1; 57 flash_map.virt = ioremap(flash_map.phys, flash_map.size); 58 pr_notice("Bootbus flash: Setting flash for %luMB flash at " 59 "0x%08llx\n", flash_map.size >> 20, flash_map.phys); 60 simple_map_init(&flash_map); 61 mymtd = do_map_probe("cfi_probe", &flash_map); 62 if (mymtd) { 63 mymtd->owner = THIS_MODULE; 64 65 nr_parts = parse_mtd_partitions(mymtd, 66 part_probe_types, 67 &parts, 0); 68 mtd_device_register(mymtd, parts, nr_parts); 69 } else { 70 pr_err("Failed to register MTD device for flash\n"); 71 } 72 } 73 return 0; 74 } 75 76 late_initcall(flash_init); 77