/* SPDX-License-Identifier: GPL-2.0 */
|
#ifndef FWH_LOCK_H
|
#define FWH_LOCK_H
|
|
|
enum fwh_lock_state {
|
FWH_UNLOCKED = 0,
|
FWH_DENY_WRITE = 1,
|
FWH_IMMUTABLE = 2,
|
FWH_DENY_READ = 4,
|
};
|
|
struct fwh_xxlock_thunk {
|
enum fwh_lock_state val;
|
flstate_t state;
|
};
|
|
|
#define FWH_XXLOCK_ONEBLOCK_LOCK ((struct fwh_xxlock_thunk){ FWH_DENY_WRITE, FL_LOCKING})
|
#define FWH_XXLOCK_ONEBLOCK_UNLOCK ((struct fwh_xxlock_thunk){ FWH_UNLOCKED, FL_UNLOCKING})
|
|
/*
|
* This locking/unlock is specific to firmware hub parts. Only one
|
* is known that supports the Intel command set. Firmware
|
* hub parts cannot be interleaved as they are on the LPC bus
|
* so this code has not been tested with interleaved chips,
|
* and will likely fail in that context.
|
*/
|
static int fwh_xxlock_oneblock(struct map_info *map, struct flchip *chip,
|
unsigned long adr, int len, void *thunk)
|
{
|
struct cfi_private *cfi = map->fldrv_priv;
|
struct fwh_xxlock_thunk *xxlt = (struct fwh_xxlock_thunk *)thunk;
|
int ret;
|
|
/* Refuse the operation if the we cannot look behind the chip */
|
if (chip->start < 0x400000) {
|
pr_debug( "MTD %s(): chip->start: %lx wanted >= 0x400000\n",
|
__func__, chip->start );
|
return -EIO;
|
}
|
/*
|
* lock block registers:
|
* - on 64k boundariesand
|
* - bit 1 set high
|
* - block lock registers are 4MiB lower - overflow subtract (danger)
|
*
|
* The address manipulation is first done on the logical address
|
* which is 0 at the start of the chip, and then the offset of
|
* the individual chip is addted to it. Any other order a weird
|
* map offset could cause problems.
|
*/
|
adr = (adr & ~0xffffUL) | 0x2;
|
adr += chip->start - 0x400000;
|
|
/*
|
* This is easy because these are writes to registers and not writes
|
* to flash memory - that means that we don't have to check status
|
* and timeout.
|
*/
|
mutex_lock(&chip->mutex);
|
ret = get_chip(map, chip, adr, FL_LOCKING);
|
if (ret) {
|
mutex_unlock(&chip->mutex);
|
return ret;
|
}
|
|
chip->oldstate = chip->state;
|
chip->state = xxlt->state;
|
map_write(map, CMD(xxlt->val), adr);
|
|
/* Done and happy. */
|
chip->state = chip->oldstate;
|
put_chip(map, chip, adr);
|
mutex_unlock(&chip->mutex);
|
return 0;
|
}
|
|
|
static int fwh_lock_varsize(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
{
|
int ret;
|
|
ret = cfi_varsize_frob(mtd, fwh_xxlock_oneblock, ofs, len,
|
(void *)&FWH_XXLOCK_ONEBLOCK_LOCK);
|
|
return ret;
|
}
|
|
|
static int fwh_unlock_varsize(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
{
|
int ret;
|
|
ret = cfi_varsize_frob(mtd, fwh_xxlock_oneblock, ofs, len,
|
(void *)&FWH_XXLOCK_ONEBLOCK_UNLOCK);
|
|
return ret;
|
}
|
|
static void fixup_use_fwh_lock(struct mtd_info *mtd)
|
{
|
printk(KERN_NOTICE "using fwh lock/unlock method\n");
|
/* Setup for the chips with the fwh lock method */
|
mtd->_lock = fwh_lock_varsize;
|
mtd->_unlock = fwh_unlock_varsize;
|
}
|
#endif /* FWH_LOCK_H */
|
