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/Ethereal-msm8939-beta9/arch/mips/cavium-octeon/flash_setup.c

https://bitbucket.org/MilosStamenkovic95/etherealos
C | 72 lines | 40 code | 4 blank | 28 comment | 3 complexity | 05ea6e7579e01f0765c83ce11952c19c MD5 | raw file
 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
18static struct map_info flash_map;
19static struct mtd_info *mymtd;
20static 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 */
33static 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
72late_initcall(flash_init);