tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Common Flash Interface support:
3 * Generic utility functions not dependant on command set
4 *
5 * Copyright (C) 2002 Red Hat
6 * Copyright (C) 2003 STMicroelectronics Limited
7 *
8 * This code is covered by the GPL.
9 *
10 * $Id: cfi_util.c,v 1.10 2005/11/07 11:14:23 gleixner Exp $
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <asm/io.h>
18#include <asm/byteorder.h>
19
20#include <linux/errno.h>
21#include <linux/slab.h>
22#include <linux/delay.h>
23#include <linux/interrupt.h>
24#include <linux/mtd/xip.h>
25#include <linux/mtd/mtd.h>
26#include <linux/mtd/map.h>
27#include <linux/mtd/cfi.h>
28#include <linux/mtd/compatmac.h>
29
30struct cfi_extquery *
31__xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name)
32{
33 struct cfi_private *cfi = map->fldrv_priv;
34 __u32 base = 0; // cfi->chips[0].start;
35 int ofs_factor = cfi->interleave * cfi->device_type;
36 int i;
37 struct cfi_extquery *extp = NULL;
38
39 printk(" %s Extended Query Table at 0x%4.4X\n", name, adr);
40 if (!adr)
41 goto out;
42
43 extp = kmalloc(size, GFP_KERNEL);
44 if (!extp) {
45 printk(KERN_ERR "Failed to allocate memory\n");
46 goto out;
47 }
48
49#ifdef CONFIG_MTD_XIP
50 local_irq_disable();
51#endif
52
53 /* Switch it into Query Mode */
54 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
55
56 /* Read in the Extended Query Table */
57 for (i=0; i<size; i++) {
58 ((unsigned char *)extp)[i] =
59 cfi_read_query(map, base+((adr+i)*ofs_factor));
60 }
61
62 /* Make sure it returns to read mode */
63 cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);
64 cfi_send_gen_cmd(0xff, 0, base, map, cfi, cfi->device_type, NULL);
65
66#ifdef CONFIG_MTD_XIP
67 (void) map_read(map, base);
68 xip_iprefetch();
69 local_irq_enable();
70#endif
71
72 out: return extp;
73}
74
75EXPORT_SYMBOL(cfi_read_pri);
76
77void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups)
78{
79 struct map_info *map = mtd->priv;
80 struct cfi_private *cfi = map->fldrv_priv;
81 struct cfi_fixup *f;
82
83 for (f=fixups; f->fixup; f++) {
84 if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
85 ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
86 f->fixup(mtd, f->param);
87 }
88 }
89}
90
91EXPORT_SYMBOL(cfi_fixup);
92
93int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
94 loff_t ofs, size_t len, void *thunk)
95{
96 struct map_info *map = mtd->priv;
97 struct cfi_private *cfi = map->fldrv_priv;
98 unsigned long adr;
99 int chipnum, ret = 0;
100 int i, first;
101 struct mtd_erase_region_info *regions = mtd->eraseregions;
102
103 if (ofs > mtd->size)
104 return -EINVAL;
105
106 if ((len + ofs) > mtd->size)
107 return -EINVAL;
108
109 /* Check that both start and end of the requested erase are
110 * aligned with the erasesize at the appropriate addresses.
111 */
112
113 i = 0;
114
115 /* Skip all erase regions which are ended before the start of
116 the requested erase. Actually, to save on the calculations,
117 we skip to the first erase region which starts after the
118 start of the requested erase, and then go back one.
119 */
120
121 while (i < mtd->numeraseregions && ofs >= regions[i].offset)
122 i++;
123 i--;
124
125 /* OK, now i is pointing at the erase region in which this
126 erase request starts. Check the start of the requested
127 erase range is aligned with the erase size which is in
128 effect here.
129 */
130
131 if (ofs & (regions[i].erasesize-1))
132 return -EINVAL;
133
134 /* Remember the erase region we start on */
135 first = i;
136
137 /* Next, check that the end of the requested erase is aligned
138 * with the erase region at that address.
139 */
140
141 while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset)
142 i++;
143
144 /* As before, drop back one to point at the region in which
145 the address actually falls
146 */
147 i--;
148
149 if ((ofs + len) & (regions[i].erasesize-1))
150 return -EINVAL;
151
152 chipnum = ofs >> cfi->chipshift;
153 adr = ofs - (chipnum << cfi->chipshift);
154
155 i=first;
156
157 while(len) {
158 int size = regions[i].erasesize;
159
160 ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk);
161
162 if (ret)
163 return ret;
164
165 adr += size;
166 ofs += size;
167 len -= size;
168
169 if (ofs == regions[i].offset + size * regions[i].numblocks)
170 i++;
171
172 if (adr >> cfi->chipshift) {
173 adr = 0;
174 chipnum++;
175
176 if (chipnum >= cfi->numchips)
177 break;
178 }
179 }
180
181 return 0;
182}
183
184EXPORT_SYMBOL(cfi_varsize_frob);
185
186MODULE_LICENSE("GPL");