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 */
flash_init(void)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 flash_map.bankwidth = 1;
55 flash_map.virt = ioremap(flash_map.phys, flash_map.size);
56 pr_notice("Bootbus flash: Setting flash for %luMB flash at "
57 "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
58 simple_map_init(&flash_map);
59 mymtd = do_map_probe("cfi_probe", &flash_map);
60 if (mymtd) {
61 mymtd->owner = THIS_MODULE;
62 mtd_device_parse_register(mymtd, part_probe_types,
63 NULL, NULL, 0);
64 } else {
65 pr_err("Failed to register MTD device for flash\n");
66 }
67 }
68 return 0;
69 }
70
71 late_initcall(flash_init);
72