mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 15:13:55 +08:00
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
|
|
* 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");
|