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 17static struct map_info flash_map; 18static struct mtd_info *mymtd; 19#ifdef CONFIG_MTD_PARTITIONS 20static int nr_parts; 21static struct mtd_partition *parts; 22static const char *part_probe_types[] = { 23 "cmdlinepart", 24#ifdef CONFIG_MTD_REDBOOT_PARTS 25 "RedBoot", 26#endif 27 NULL 28}; 29#endif 30 31/** 32 * Module/ driver initialization. 33 * 34 * Returns Zero on success 35 */ 36static int __init flash_init(void) 37{ 38 /* 39 * Read the bootbus region 0 setup to determine the base 40 * address of the flash. 41 */ 42 union cvmx_mio_boot_reg_cfgx region_cfg; 43 region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0)); 44 if (region_cfg.s.en) { 45 /* 46 * The bootloader always takes the flash and sets its 47 * address so the entire flash fits below 48 * 0x1fc00000. This way the flash aliases to 49 * 0x1fc00000 for booting. Software can access the 50 * full flash at the true address, while core boot can 51 * access 4MB. 52 */ 53 /* Use this name so old part lines work */ 54 flash_map.name = "phys_mapped_flash"; 55 flash_map.phys = region_cfg.s.base << 16; 56 flash_map.size = 0x1fc00000 - flash_map.phys; 57 flash_map.bankwidth = 1; 58 flash_map.virt = ioremap(flash_map.phys, flash_map.size); 59 pr_notice("Bootbus flash: Setting flash for %luMB flash at " 60 "0x%08llx\n", flash_map.size >> 20, flash_map.phys); 61 simple_map_init(&flash_map); 62 mymtd = do_map_probe("cfi_probe", &flash_map); 63 if (mymtd) { 64 mymtd->owner = THIS_MODULE; 65 66#ifdef CONFIG_MTD_PARTITIONS 67 nr_parts = parse_mtd_partitions(mymtd, 68 part_probe_types, 69 &parts, 0); 70 if (nr_parts > 0) 71 add_mtd_partitions(mymtd, parts, nr_parts); 72 else 73 add_mtd_device(mymtd); 74#else 75 add_mtd_device(mymtd); 76#endif 77 } else { 78 pr_err("Failed to register MTD device for flash\n"); 79 } 80 } 81 return 0; 82} 83 84late_initcall(flash_init); 85