forked from luck/tmp_suning_uos_patched
f77814dd57
This enables support for reading, writing and locking so called "Protection Registers" present on some flash chips. A subset of them are pre-programmed at the factory with a unique set of values. The rest is user-programmable. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* struct flchip definition
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*
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* Contains information about the location and state of a given flash device
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*
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* (C) 2000 Red Hat. GPLd.
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*
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* $Id: flashchip.h,v 1.16 2005/02/08 17:11:15 nico Exp $
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*
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*/
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#ifndef __MTD_FLASHCHIP_H__
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#define __MTD_FLASHCHIP_H__
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/* For spinlocks. sched.h includes spinlock.h from whichever directory it
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* happens to be in - so we don't have to care whether we're on 2.2, which
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* has asm/spinlock.h, or 2.4, which has linux/spinlock.h
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*/
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#include <linux/sched.h>
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typedef enum {
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FL_READY,
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FL_STATUS,
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FL_CFI_QUERY,
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FL_JEDEC_QUERY,
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FL_ERASING,
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FL_ERASE_SUSPENDING,
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FL_ERASE_SUSPENDED,
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FL_WRITING,
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FL_WRITING_TO_BUFFER,
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FL_OTP_WRITE,
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FL_WRITE_SUSPENDING,
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FL_WRITE_SUSPENDED,
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FL_PM_SUSPENDED,
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FL_SYNCING,
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FL_UNLOADING,
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FL_LOCKING,
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FL_UNLOCKING,
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FL_POINT,
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FL_XIP_WHILE_ERASING,
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FL_XIP_WHILE_WRITING,
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FL_UNKNOWN
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} flstate_t;
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/* NOTE: confusingly, this can be used to refer to more than one chip at a time,
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if they're interleaved. This can even refer to individual partitions on
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the same physical chip when present. */
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struct flchip {
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unsigned long start; /* Offset within the map */
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// unsigned long len;
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/* We omit len for now, because when we group them together
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we insist that they're all of the same size, and the chip size
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is held in the next level up. If we get more versatile later,
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it'll make it a damn sight harder to find which chip we want from
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a given offset, and we'll want to add the per-chip length field
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back in.
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*/
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int ref_point_counter;
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flstate_t state;
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flstate_t oldstate;
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int write_suspended:1;
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int erase_suspended:1;
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unsigned long in_progress_block_addr;
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spinlock_t *mutex;
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spinlock_t _spinlock; /* We do it like this because sometimes they'll be shared. */
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wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
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to be ready */
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int word_write_time;
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int buffer_write_time;
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int erase_time;
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void *priv;
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};
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/* This is used to handle contention on write/erase operations
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between partitions of the same physical chip. */
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struct flchip_shared {
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spinlock_t lock;
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struct flchip *writing;
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struct flchip *erasing;
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};
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#endif /* __MTD_FLASHCHIP_H__ */
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