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flashchip.h
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1 /*
2  * Copyright © 2000 Red Hat UK Limited
3  * Copyright © 2000-2010 David Woodhouse <[email protected]>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  *
19  */
20 
21 #ifndef __MTD_FLASHCHIP_H__
22 #define __MTD_FLASHCHIP_H__
23 
24 /* For spinlocks. sched.h includes spinlock.h from whichever directory it
25  * happens to be in - so we don't have to care whether we're on 2.2, which
26  * has asm/spinlock.h, or 2.4, which has linux/spinlock.h
27  */
28 #include <linux/sched.h>
29 #include <linux/mutex.h>
30 
31 typedef enum {
32  FL_READY,
33  FL_STATUS,
34  FL_CFI_QUERY,
35  FL_JEDEC_QUERY,
36  FL_ERASING,
37  FL_ERASE_SUSPENDING,
38  FL_ERASE_SUSPENDED,
39  FL_WRITING,
40  FL_WRITING_TO_BUFFER,
41  FL_OTP_WRITE,
42  FL_WRITE_SUSPENDING,
43  FL_WRITE_SUSPENDED,
44  FL_PM_SUSPENDED,
45  FL_SYNCING,
46  FL_UNLOADING,
47  FL_LOCKING,
48  FL_UNLOCKING,
49  FL_POINT,
50  FL_XIP_WHILE_ERASING,
51  FL_XIP_WHILE_WRITING,
52  FL_SHUTDOWN,
53  /* These 2 come from nand_state_t, which has been unified here */
54  FL_READING,
55  FL_CACHEDPRG,
56  /* These 4 come from onenand_state_t, which has been unified here */
57  FL_RESETING,
58  FL_OTPING,
59  FL_PREPARING_ERASE,
60  FL_VERIFYING_ERASE,
61 
62  FL_UNKNOWN
63 } flstate_t;
64 
65 
66 
67 /* NOTE: confusingly, this can be used to refer to more than one chip at a time,
68  if they're interleaved. This can even refer to individual partitions on
69  the same physical chip when present. */
70 
71 struct flchip {
72  unsigned long start; /* Offset within the map */
73  // unsigned long len;
74  /* We omit len for now, because when we group them together
75  we insist that they're all of the same size, and the chip size
76  is held in the next level up. If we get more versatile later,
77  it'll make it a damn sight harder to find which chip we want from
78  a given offset, and we'll want to add the per-chip length field
79  back in.
80  */
81  int ref_point_counter;
82  flstate_t state;
83  flstate_t oldstate;
84 
85  unsigned int write_suspended:1;
86  unsigned int erase_suspended:1;
87  unsigned long in_progress_block_addr;
88 
89  struct mutex mutex;
90  wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
91  to be ready */
92  int word_write_time;
93  int buffer_write_time;
94  int erase_time;
95 
96  int word_write_time_max;
97  int buffer_write_time_max;
98  int erase_time_max;
99 
100  void *priv;
101 };
102 
103 /* This is used to handle contention on write/erase operations
104  between partitions of the same physical chip. */
105 struct flchip_shared {
106  struct mutex lock;
107  struct flchip *writing;
108  struct flchip *erasing;
109 };
110 
111 
112 #endif /* __MTD_FLASHCHIP_H__ */
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