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/*
* Octeon Bootbus flash setup
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2007, 2008 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/semaphore.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/of_platform.h>
#include <linux/mtd/partitions.h>
#include <asm/octeon/octeon.h>
static struct map_info flash_map;
static struct mtd_info *mymtd;
static const char *part_probe_types[] = {
"cmdlinepart",
#ifdef CONFIG_MTD_REDBOOT_PARTS
"RedBoot",
#endif
NULL
};
static map_word octeon_flash_map_read(struct map_info *map, unsigned long ofs)
{
map_word r;
down(&octeon_bootbus_sem);
r = inline_map_read(map, ofs);
up(&octeon_bootbus_sem);
return r;
}
static void octeon_flash_map_write(struct map_info *map, const map_word datum,
unsigned long ofs)
{
down(&octeon_bootbus_sem);
inline_map_write(map, datum, ofs);
up(&octeon_bootbus_sem);
}
static void octeon_flash_map_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
down(&octeon_bootbus_sem);
inline_map_copy_from(map, to, from, len);
up(&octeon_bootbus_sem);
}
static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
const void *from, ssize_t len)
{
down(&octeon_bootbus_sem);
inline_map_copy_to(map, to, from, len);
up(&octeon_bootbus_sem);
}
/*
* Module/ driver initialization.
*
* Returns Zero on success
*/
static int octeon_flash_probe(struct platform_device *pdev)
{
union cvmx_mio_boot_reg_cfgx region_cfg;
u32 cs;
int r;
struct device_node *np = pdev->dev.of_node;
r = of_property_read_u32(np, "reg", &cs);
if (r)
return r;
/*
* Read the bootbus region 0 setup to determine the base
* address of the flash.
*/
region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
if (region_cfg.s.en) {
/*
* The bootloader always takes the flash and sets its
* address so the entire flash fits below
* 0x1fc00000. This way the flash aliases to
* 0x1fc00000 for booting. Software can access the
* full flash at the true address, while core boot can
* access 4MB.
*/
/* Use this name so old part lines work */
flash_map.name = "phys_mapped_flash";
flash_map.phys = region_cfg.s.base << 16;
flash_map.size = 0x1fc00000 - flash_map.phys;
/* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
flash_map.bankwidth = region_cfg.s.width + 1;
flash_map.virt = ioremap(flash_map.phys, flash_map.size);
pr_notice("Bootbus flash: Setting flash for %luMB flash at "
"0x%08llx\n", flash_map.size >> 20, flash_map.phys);
WARN_ON(!map_bankwidth_supported(flash_map.bankwidth));
flash_map.read = octeon_flash_map_read;
flash_map.write = octeon_flash_map_write;
flash_map.copy_from = octeon_flash_map_copy_from;
flash_map.copy_to = octeon_flash_map_copy_to;
mymtd = do_map_probe("cfi_probe", &flash_map);
if (mymtd) {
mymtd->owner = THIS_MODULE;
mtd_device_parse_register(mymtd, part_probe_types,
NULL, NULL, 0);
} else {
pr_err("Failed to register MTD device for flash\n");
}
}
return 0;
}
static const struct of_device_id of_flash_match[] = {
{
.compatible = "cfi-flash",
},
{ },
};
MODULE_DEVICE_TABLE(of, of_flash_match);
static struct platform_driver of_flash_driver = {
.driver = {
.name = "octeon-of-flash",
.of_match_table = of_flash_match,
},
.probe = octeon_flash_probe,
};
static int octeon_flash_init(void)
{
return platform_driver_register(&of_flash_driver);
}
late_initcall(octeon_flash_init);
MODULE_LICENSE("GPL");
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