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 #ifdef CONFIG_MTD_PARTITIONS
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 #endif
30 
31 /**
32  * Module/ driver initialization.
33  *
34  * Returns Zero on success
35  */
36 static 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 
84 late_initcall(flash_init);
85