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 const char *part_probe_types[] = {
21 	"cmdlinepart",
22 #ifdef CONFIG_MTD_REDBOOT_PARTS
23 	"RedBoot",
24 #endif
25 	NULL
26 };
27 
28 /**
29  * Module/ driver initialization.
30  *
31  * Returns Zero on success
32  */
33 static int __init flash_init(void)
34 {
35 	/*
36 	 * Read the bootbus region 0 setup to determine the base
37 	 * address of the flash.
38 	 */
39 	union cvmx_mio_boot_reg_cfgx region_cfg;
40 	region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0));
41 	if (region_cfg.s.en) {
42 		/*
43 		 * The bootloader always takes the flash and sets its
44 		 * address so the entire flash fits below
45 		 * 0x1fc00000. This way the flash aliases to
46 		 * 0x1fc00000 for booting. Software can access the
47 		 * full flash at the true address, while core boot can
48 		 * access 4MB.
49 		 */
50 		/* Use this name so old part lines work */
51 		flash_map.name = "phys_mapped_flash";
52 		flash_map.phys = region_cfg.s.base << 16;
53 		flash_map.size = 0x1fc00000 - flash_map.phys;
54 		/* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
55 		flash_map.bankwidth = region_cfg.s.width + 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 			mtd_device_parse_register(mymtd, part_probe_types,
64 						  NULL, NULL, 0);
65 		} else {
66 			pr_err("Failed to register MTD device for flash\n");
67 		}
68 	}
69 	return 0;
70 }
71 
72 late_initcall(flash_init);
73