[672038b] | 1 | /* |
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| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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| 3 | * |
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| 4 | * Copyright (C) 2001-2003 Red Hat, Inc. |
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| 5 | * |
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| 6 | * Created by Dominic Ostrowski <dominic.ostrowski@3glab.com> |
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| 7 | * Contributors: David Woodhouse, Nick Garnett, Richard Panton. |
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| 8 | * |
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| 9 | * For licensing information, see the file 'LICENCE' in this directory. |
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| 10 | * |
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| 11 | * $Id: flashio.c,v 1.1 2003/11/26 14:09:29 dwmw2 Exp $ |
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| 12 | * |
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| 13 | */ |
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| 14 | |
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| 15 | #include <linux/kernel.h> |
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| 16 | #include "nodelist.h" |
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| 17 | |
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| 18 | #include <cyg/io/io.h> |
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| 19 | #include <cyg/io/config_keys.h> |
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| 20 | #include <cyg/io/flash.h> |
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| 21 | |
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| 22 | cyg_bool jffs2_flash_read(struct jffs2_sb_info * c, |
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| 23 | cyg_uint32 read_buffer_offset, const size_t size, |
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| 24 | size_t * return_size, unsigned char *write_buffer) |
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| 25 | { |
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| 26 | Cyg_ErrNo err; |
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| 27 | cyg_uint32 len = size; |
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| 28 | struct super_block *sb = OFNI_BS_2SFFJ(c); |
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| 29 | |
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| 30 | //D2(printf("FLASH READ\n")); |
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| 31 | //D2(printf("read address = %x\n", CYGNUM_FS_JFFS2_BASE_ADDRESS + read_buffer_offset)); |
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| 32 | //D2(printf("write address = %x\n", write_buffer)); |
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| 33 | //D2(printf("size = %x\n", size)); |
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| 34 | err = cyg_io_bread(sb->s_dev, write_buffer, &len, read_buffer_offset); |
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| 35 | |
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| 36 | *return_size = (size_t) len; |
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| 37 | return ((err == ENOERR) ? ENOERR : -EIO); |
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| 38 | } |
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| 39 | |
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| 40 | cyg_bool jffs2_flash_write(struct jffs2_sb_info * c, |
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| 41 | cyg_uint32 write_buffer_offset, const size_t size, |
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| 42 | size_t * return_size, unsigned char *read_buffer) |
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| 43 | { |
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| 44 | |
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| 45 | Cyg_ErrNo err; |
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| 46 | cyg_uint32 len = size; |
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| 47 | struct super_block *sb = OFNI_BS_2SFFJ(c); |
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| 48 | |
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| 49 | // D2(printf("FLASH WRITE ENABLED!!!\n")); |
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| 50 | // D2(printf("write address = %x\n", CYGNUM_FS_JFFS2_BASE_ADDRESS + write_buffer_offset)); |
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| 51 | // D2(printf("read address = %x\n", read_buffer)); |
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| 52 | // D2(printf("size = %x\n", size)); |
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| 53 | |
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| 54 | err = cyg_io_bwrite(sb->s_dev, read_buffer, &len, write_buffer_offset); |
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| 55 | *return_size = (size_t) len; |
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| 56 | |
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| 57 | return ((err == ENOERR) ? ENOERR : -EIO); |
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| 58 | } |
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| 59 | |
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| 60 | int |
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| 61 | jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct iovec *vecs, |
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| 62 | unsigned long count, loff_t to, size_t * retlen) |
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| 63 | { |
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| 64 | unsigned long i; |
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| 65 | size_t totlen = 0, thislen; |
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| 66 | int ret = 0; |
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| 67 | |
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| 68 | for (i = 0; i < count; i++) { |
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| 69 | // writes need to be aligned but the data we're passed may not be |
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| 70 | // Observation suggests most unaligned writes are small, so we |
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| 71 | // optimize for that case. |
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| 72 | |
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| 73 | if (((vecs[i].iov_len & (sizeof (int) - 1))) || |
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| 74 | (((unsigned long) vecs[i]. |
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| 75 | iov_base & (sizeof (unsigned long) - 1)))) { |
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| 76 | // are there iov's after this one? Or is it so much we'd need |
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| 77 | // to do multiple writes anyway? |
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| 78 | if ((i + 1) < count || vecs[i].iov_len > 256) { |
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| 79 | // cop out and malloc |
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| 80 | unsigned long j; |
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| 81 | ssize_t sizetomalloc = 0, totvecsize = 0; |
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| 82 | char *cbuf, *cbufptr; |
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| 83 | |
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| 84 | for (j = i; j < count; j++) |
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| 85 | totvecsize += vecs[j].iov_len; |
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| 86 | |
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| 87 | // pad up in case unaligned |
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| 88 | sizetomalloc = totvecsize + sizeof (int) - 1; |
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| 89 | sizetomalloc &= ~(sizeof (int) - 1); |
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| 90 | cbuf = (char *) malloc(sizetomalloc); |
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| 91 | // malloc returns aligned memory |
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| 92 | if (!cbuf) { |
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| 93 | ret = -ENOMEM; |
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| 94 | goto writev_out; |
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| 95 | } |
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| 96 | cbufptr = cbuf; |
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| 97 | for (j = i; j < count; j++) { |
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| 98 | memcpy(cbufptr, vecs[j].iov_base, |
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| 99 | vecs[j].iov_len); |
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| 100 | cbufptr += vecs[j].iov_len; |
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| 101 | } |
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| 102 | ret = |
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| 103 | jffs2_flash_write(c, to, sizetomalloc, |
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| 104 | &thislen, cbuf); |
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| 105 | if (thislen > totvecsize) // in case it was aligned up |
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| 106 | thislen = totvecsize; |
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| 107 | totlen += thislen; |
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| 108 | free(cbuf); |
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| 109 | goto writev_out; |
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| 110 | } else { |
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| 111 | // otherwise optimize for the common case |
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| 112 | int buf[256 / sizeof (int)]; // int, so int aligned |
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| 113 | size_t lentowrite; |
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| 114 | |
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| 115 | lentowrite = vecs[i].iov_len; |
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| 116 | // pad up in case its unaligned |
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| 117 | lentowrite += sizeof (int) - 1; |
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| 118 | lentowrite &= ~(sizeof (int) - 1); |
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| 119 | memcpy(buf, vecs[i].iov_base, lentowrite); |
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| 120 | |
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| 121 | ret = |
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| 122 | jffs2_flash_write(c, to, lentowrite, |
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| 123 | &thislen, (char *) &buf); |
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| 124 | if (thislen > vecs[i].iov_len) |
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| 125 | thislen = vecs[i].iov_len; |
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| 126 | } // else |
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| 127 | } else |
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| 128 | ret = |
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| 129 | jffs2_flash_write(c, to, vecs[i].iov_len, &thislen, |
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| 130 | vecs[i].iov_base); |
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| 131 | totlen += thislen; |
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| 132 | if (ret || thislen != vecs[i].iov_len) |
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| 133 | break; |
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| 134 | to += vecs[i].iov_len; |
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| 135 | } |
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| 136 | writev_out: |
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| 137 | if (retlen) |
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| 138 | *retlen = totlen; |
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| 139 | |
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| 140 | return ret; |
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| 141 | } |
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| 142 | |
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| 143 | cyg_bool jffs2_flash_erase(struct jffs2_sb_info * c, |
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| 144 | struct jffs2_eraseblock * jeb) |
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| 145 | { |
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| 146 | cyg_io_flash_getconfig_erase_t e; |
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| 147 | cyg_flashaddr_t err_addr; |
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| 148 | Cyg_ErrNo err; |
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| 149 | cyg_uint32 len = sizeof (e); |
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| 150 | struct super_block *sb = OFNI_BS_2SFFJ(c); |
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| 151 | |
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| 152 | e.offset = jeb->offset; |
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| 153 | e.len = c->sector_size; |
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| 154 | e.err_address = &err_addr; |
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| 155 | |
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| 156 | // D2(printf("FLASH ERASE ENABLED!!!\n")); |
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| 157 | // D2(printf("erase address = %x\n", CYGNUM_FS_JFFS2_BASE_ADDRESS + jeb->offset)); |
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| 158 | // D2(printf("size = %x\n", c->sector_size)); |
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| 159 | |
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| 160 | err = cyg_io_get_config(sb->s_dev, CYG_IO_GET_CONFIG_FLASH_ERASE, |
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| 161 | &e, &len); |
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| 162 | |
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| 163 | return (err != ENOERR || e.flasherr != 0); |
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| 164 | } |
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| 165 | |
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