MIPS: Add Cavium OCTEON processor support files to arch/mips/cavium-octeon.
[linux-2.6.git] / arch / mips / cavium-octeon / flash_setup.c
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%08lx\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);