/* $OpenBSD: zaurus_flash.c,v 1.6 2007/10/06 02:18:38 krw Exp $ */ /* * Copyright (c) 2005 Uwe Stuehler * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Samsung NAND flash controlled by some unspecified CPLD device. */ #include #include #include #include #include #include #include #include #include #include #include #include #define DEBUG #ifdef DEBUG #define DPRINTF(x) printf x #else #define DPRINTF(x) #endif /* CPLD register definitions */ #define CPLD_REG_ECCLPLB 0x00 #define CPLD_REG_ECCLPUB 0x04 #define CPLD_REG_ECCCP 0x08 #define CPLD_REG_ECCCNTR 0x0c #define CPLD_REG_ECCCLRR 0x10 #define CPLD_REG_FLASHIO 0x14 #define CPLD_REG_FLASHCTL 0x18 #define FLASHCTL_NCE0 (1<<0) #define FLASHCTL_CLE (1<<1) #define FLASHCTL_ALE (1<<2) #define FLASHCTL_NWP (1<<3) #define FLASHCTL_NCE1 (1<<4) #define FLASHCTL_RYBY (1<<5) #define FLASHCTL_NCE (FLASHCTL_NCE0|FLASHCTL_NCE1) /* CPLD register accesses */ #define CPLD_READ(sc, r) \ bus_space_read_1((sc)->sc_iot, (sc)->sc_ioh, (r)) #define CPLD_WRITE(sc, r, v) \ bus_space_write_1((sc)->sc_iot, (sc)->sc_ioh, (r), (v)) #define CPLD_SET(sc, r, v) \ CPLD_WRITE((sc), (r), CPLD_READ((sc), (r)) | (v)) #define CPLD_CLR(sc, r, v) \ CPLD_WRITE((sc), (r), CPLD_READ((sc), (r)) & ~(v)) #define CPLD_SETORCLR(sc, r, m, v) \ ((v) ? CPLD_SET((sc), (r), (m)) : CPLD_CLR((sc), (r), (m))) /* Offsets into OOB data. */ #define OOB_JFFS2_ECC0 0 #define OOB_JFFS2_ECC1 1 #define OOB_JFFS2_ECC2 2 #define OOB_JFFS2_ECC3 3 #define OOB_JFFS2_ECC4 6 #define OOB_JFFS2_ECC5 7 #define OOB_LOGADDR_0_LO 8 #define OOB_LOGADDR_0_HI 9 #define OOB_LOGADDR_1_LO 10 #define OOB_LOGADDR_1_HI 11 #define OOB_LOGADDR_2_LO 12 #define OOB_LOGADDR_2_HI 13 /* * Structure for managing logical blocks in a partition; allocated on * first use of each partition on a "safe" flash device. */ struct zflash_safe { dev_t sp_dev; u_long sp_pblks; /* physical block count */ u_long sp_lblks; /* logical block count */ u_int16_t *sp_phyuse; /* physical block usage */ u_int *sp_logmap; /* logical to physical */ u_int sp_pnext; /* next physical block */ }; struct zflash_softc { struct flash_softc sc_flash; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; int sc_ioobbadblk; int sc_ioobpostbadblk; struct zflash_safe *sc_safe[MAXPARTITIONS]; }; int zflashmatch(struct device *, void *, void *); void zflashattach(struct device *, struct device *, void *); int zflashdetach(struct device *, int); u_int8_t zflash_reg8_read(void *, int); int zflash_regx_read_page(void *, caddr_t, caddr_t); void zflash_reg8_write(void *, int, u_int8_t); int zflash_regx_write_page(void *, caddr_t, caddr_t); void zflash_default_disklabel(void *, dev_t, struct disklabel *); int zflash_safe_strategy(void *, struct buf *); int zflash_safe_start(struct zflash_softc *, dev_t); void zflash_safe_stop(struct zflash_softc *, dev_t); struct cfattach flash_pxaip_ca = { sizeof(struct zflash_softc), zflashmatch, zflashattach, zflashdetach, flashactivate }; struct flash_ctl_tag zflash_ctl_tag = { zflash_reg8_read, zflash_regx_read_page, zflash_reg8_write, zflash_regx_write_page, zflash_default_disklabel, zflash_safe_strategy }; int zflashmatch(struct device *parent, void *match, void *aux) { /* XXX call flashprobe(), yet to be implemented */ return ZAURUS_ISC3000; } void zflashattach(struct device *parent, struct device *self, void *aux) { struct zflash_softc *sc = (struct zflash_softc *)self; struct pxaip_attach_args *pxa = aux; bus_addr_t addr = pxa->pxa_addr; bus_size_t size = pxa->pxa_size; sc->sc_iot = pxa->pxa_iot; if ((int)addr == -1 || (int)size == 0) { addr = 0x0c000000; size = 0x00001000; } if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh) != 0) { printf(": failed to map controller\n"); return; } /* Disable and write-protect the chip. */ CPLD_WRITE(sc, CPLD_REG_FLASHCTL, FLASHCTL_NCE); flashattach(&sc->sc_flash, &zflash_ctl_tag, sc); switch (sc->sc_flash.sc_flashdev->id) { case FLASH_DEVICE_SAMSUNG_K9F2808U0C: /* C3000 */ sc->sc_ioobpostbadblk = 4; sc->sc_ioobbadblk = 5; break; case FLASH_DEVICE_SAMSUNG_K9F1G08U0A: /* C3100 */ sc->sc_ioobpostbadblk = 4; sc->sc_ioobbadblk = 0; break; } } int zflashdetach(struct device *self, int flags) { struct zflash_softc *sc = (struct zflash_softc *)self; int part; for (part = 0; part < MAXPARTITIONS; part++) zflash_safe_stop(sc, part); return (flashdetach(self, flags)); } u_int8_t zflash_reg8_read(void *arg, int reg) { struct zflash_softc *sc = arg; u_int8_t value; switch (reg) { case FLASH_REG_DATA: value = CPLD_READ(sc, CPLD_REG_FLASHIO); break; case FLASH_REG_READY: value = (CPLD_READ(sc, CPLD_REG_FLASHCTL) & FLASHCTL_RYBY) != 0; break; default: #ifdef DIAGNOSTIC printf("%s: read from pseudo-register %02x\n", sc->sc_flash.sc_dev.dv_xname, reg); #endif value = 0; break; } return value; } void zflash_reg8_write(void *arg, int reg, u_int8_t value) { struct zflash_softc *sc = arg; switch (reg) { case FLASH_REG_DATA: case FLASH_REG_COL: case FLASH_REG_ROW: case FLASH_REG_CMD: CPLD_WRITE(sc, CPLD_REG_FLASHIO, value); break; case FLASH_REG_ALE: CPLD_SETORCLR(sc, CPLD_REG_FLASHCTL, FLASHCTL_ALE, value); break; case FLASH_REG_CLE: CPLD_SETORCLR(sc, CPLD_REG_FLASHCTL, FLASHCTL_CLE, value); break; case FLASH_REG_CE: CPLD_SETORCLR(sc, CPLD_REG_FLASHCTL, FLASHCTL_NCE, !value); break; case FLASH_REG_WP: CPLD_SETORCLR(sc, CPLD_REG_FLASHCTL, FLASHCTL_NWP, !value); break; #ifdef DIAGNOSTIC default: printf("%s: write to pseudo-register %02x\n", sc->sc_flash.sc_dev.dv_xname, reg); #endif } } int zflash_regx_read_page(void *arg, caddr_t data, caddr_t oob) { struct zflash_softc *sc = arg; if (oob == NULL || sc->sc_flash.sc_flashdev->pagesize != 512) { flash_reg8_read_page(&sc->sc_flash, data, oob); return 0; } flash_reg8_read_page(&sc->sc_flash, data, oob); oob[OOB_JFFS2_ECC0] = 0xff; oob[OOB_JFFS2_ECC1] = 0xff; oob[OOB_JFFS2_ECC2] = 0xff; oob[OOB_JFFS2_ECC3] = 0xff; oob[OOB_JFFS2_ECC4] = 0xff; oob[OOB_JFFS2_ECC5] = 0xff; return 0; } int zflash_regx_write_page(void *arg, caddr_t data, caddr_t oob) { struct zflash_softc *sc = arg; int i; if (oob == NULL || sc->sc_flash.sc_flashdev->pagesize != 512) { flash_reg8_write_page(&sc->sc_flash, data, oob); return 0; } if (oob[OOB_JFFS2_ECC0] != 0xff || oob[OOB_JFFS2_ECC1] != 0xff || oob[OOB_JFFS2_ECC2] != 0xff || oob[OOB_JFFS2_ECC3] != 0xff || oob[OOB_JFFS2_ECC4] != 0xff || oob[OOB_JFFS2_ECC5] != 0xff) { #ifdef DIAGNOSTIC printf("%s: non-FF ECC bytes in OOB data\n", sc->sc_flash.sc_dev.dv_xname); #endif return EINVAL; } CPLD_WRITE(sc, CPLD_REG_ECCCLRR, 0x00); for (i = 0; i < sc->sc_flash.sc_flashdev->pagesize / 2; i++) flash_reg8_write(&sc->sc_flash, FLASH_REG_DATA, data[i]); oob[OOB_JFFS2_ECC0] = ~CPLD_READ(sc, CPLD_REG_ECCLPUB); oob[OOB_JFFS2_ECC1] = ~CPLD_READ(sc, CPLD_REG_ECCLPLB); oob[OOB_JFFS2_ECC2] = (~CPLD_READ(sc, CPLD_REG_ECCCP) << 2) | 0x03; if (CPLD_READ(sc, CPLD_REG_ECCCNTR) != 0) { printf("%s: ECC failed\n", sc->sc_flash.sc_dev.dv_xname); oob[OOB_JFFS2_ECC0] = 0xff; oob[OOB_JFFS2_ECC1] = 0xff; oob[OOB_JFFS2_ECC2] = 0xff; return EIO; } CPLD_WRITE(sc, CPLD_REG_ECCCLRR, 0x00); for (; i < sc->sc_flash.sc_flashdev->pagesize; i++) flash_reg8_write(&sc->sc_flash, FLASH_REG_DATA, data[i]); oob[OOB_JFFS2_ECC3] = ~CPLD_READ(sc, CPLD_REG_ECCLPUB); oob[OOB_JFFS2_ECC4] = ~CPLD_READ(sc, CPLD_REG_ECCLPLB); oob[OOB_JFFS2_ECC5] = (~CPLD_READ(sc, CPLD_REG_ECCCP) << 2) | 0x03; if (CPLD_READ(sc, CPLD_REG_ECCCNTR) != 0) { printf("%s: ECC failed\n", sc->sc_flash.sc_dev.dv_xname); oob[OOB_JFFS2_ECC0] = 0xff; oob[OOB_JFFS2_ECC1] = 0xff; oob[OOB_JFFS2_ECC2] = 0xff; oob[OOB_JFFS2_ECC3] = 0xff; oob[OOB_JFFS2_ECC4] = 0xff; oob[OOB_JFFS2_ECC5] = 0xff; return EIO; } for (i = 0; i < sc->sc_flash.sc_flashdev->oobsize; i++) flash_reg8_write(&sc->sc_flash, FLASH_REG_DATA, oob[i]); oob[OOB_JFFS2_ECC0] = 0xff; oob[OOB_JFFS2_ECC1] = 0xff; oob[OOB_JFFS2_ECC2] = 0xff; oob[OOB_JFFS2_ECC3] = 0xff; oob[OOB_JFFS2_ECC4] = 0xff; oob[OOB_JFFS2_ECC5] = 0xff; return 0; } /* * A default disklabel with only one RAW_PART spanning the whole * device is passed to us. We add the partitions besides RAW_PART. */ void zflash_default_disklabel(void *arg, dev_t dev, struct disklabel *lp) { struct zflash_softc *sc = arg; long bsize = sc->sc_flash.sc_flashdev->pagesize; switch (sc->sc_flash.sc_flashdev->id) { case FLASH_DEVICE_SAMSUNG_K9F2808U0C: DL_SETPSIZE(&lp->d_partitions[8], 7*1024*1024 / bsize); DL_SETPSIZE(&lp->d_partitions[9], 5*1024*1024 / bsize); DL_SETPSIZE(&lp->d_partitions[10], 4*1024*1024 / bsize); break; case FLASH_DEVICE_SAMSUNG_K9F1G08U0A: DL_SETPSIZE(&lp->d_partitions[8], 7*1024*1024 / bsize); DL_SETPSIZE(&lp->d_partitions[9], 32*1024*1024 / bsize); DL_SETPSIZE(&lp->d_partitions[10], 89*1024*1024 / bsize); break; default: return; } /* The "smf" partition uses logical addressing. */ DL_SETPOFFSET(&lp->d_partitions[8], 0); lp->d_partitions[8].p_fstype = FS_OTHER; /* The "root" partition uses physical addressing. */ DL_SETPSIZE(&lp->d_partitions[9], DL_GETPSIZE(&lp->d_partitions[8])); lp->d_partitions[9].p_fstype = FS_OTHER; /* The "home" partition uses physical addressing. */ DL_SETPOFFSET(&lp->d_partitions[10], DL_GETPOFFSET(&lp->d_partitions[9]) + DL_GETPSIZE(&lp->d_partitions[9])); lp->d_partitions[10].p_fstype = FS_OTHER; lp->d_npartitions = 11; lp->d_version = 1; /* Re-calculate the checksum. */ lp->d_checksum = dkcksum(lp); } /* * Sharp's access strategy for bad blocks management and wear-leveling. */ #define PHYUSE_STATUS(v) ((v) & 0x00ff) #define P_BADBLOCK 0x0000 #define P_POSTBADBLOCK 0x00f0 #define P_NORMALBLOCK 0x00ff #define PHYUSE_WRITTEN(v) ((v) & 0xff00) #define P_DUST 0x0000 #define P_LOGICAL 0x0100 #define P_JFFS2 0x0300 void zflash_write_strategy(struct zflash_softc *, struct buf *, struct zflash_safe *, u_int, u_int); u_int zflash_safe_next_block(struct zflash_safe *); u_char zflash_oob_status_decode(u_char); u_int16_t zflash_oob_status(struct zflash_softc *, u_char *); u_int zflash_oob_logno(struct zflash_softc *, u_char *); void zflash_oob_set_status(struct zflash_softc *, u_char *, u_int16_t); void zflash_oob_set_logno(struct zflash_softc *, u_char *, u_int); int zflash_safe_strategy(void *arg, struct buf *bp) { struct zflash_softc *sc = arg; struct zflash_safe *sp; u_int logno; u_int blkofs; u_int blkno; int error; int part; int i; /* Initialize logical blocks management on the fly. */ /* XXX toss everything when the disklabel has changed. */ if ((error = zflash_safe_start(sc, bp->b_dev)) != 0) { bp->b_error = error; bp->b_flags |= B_ERROR; return 0; } part = flashpart(bp->b_dev); sp = sc->sc_safe[part]; logno = bp->b_blkno / (sc->sc_flash.sc_flashdev->blkpages * sc->sc_flash.sc_flashdev->pagesize / DEV_BSIZE); blkofs = bp->b_blkno % (sc->sc_flash.sc_flashdev->blkpages * sc->sc_flash.sc_flashdev->pagesize / DEV_BSIZE); /* If exactly at end of logical flash, return EOF, else error. */ if (logno == sp->sp_lblks && blkofs == 0) { bp->b_resid = bp->b_bcount; return 0; } else if (logno >= sp->sp_lblks) { bp->b_error = EINVAL; bp->b_flags |= B_ERROR; return 0; } /* Writing is more complicated, so handle it separately. */ if ((bp->b_flags & B_READ) == 0) { flash_chip_enable(&sc->sc_flash); zflash_write_strategy(sc, bp, sp, logno, blkofs); flash_chip_disable(&sc->sc_flash); return 0; } /* Get the physical flash block number for this logical one. */ blkno = sp->sp_logmap[logno]; /* Unused logical blocks read as all 0xff. */ if ((bp->b_flags & B_READ) != 0 && blkno == UINT_MAX) { for (i = 0; i < sc->sc_flash.sc_flashdev->pagesize; i++) ((u_char *)bp->b_data)[i] = 0xff; bp->b_resid = bp->b_bcount - sc->sc_flash.sc_flashdev->pagesize; return 0; } /* Update the block number in the buffer with the physical one. */ bp->b_blkno = blkno * (sc->sc_flash.sc_flashdev->blkpages * sc->sc_flash.sc_flashdev->pagesize / DEV_BSIZE) + blkofs; /* Process the modified transfer buffer normally. */ return 1; } void zflash_write_strategy(struct zflash_softc *sc, struct buf *bp, struct zflash_safe *sp, u_int logno, u_int logofs) { size_t bufsize; u_char *buf = NULL; size_t oobsize; u_char *oob = NULL; u_int oblkno; u_int nblkno; int error; /* Not efficient, but we always transfer one page for now. */ if (bp->b_bcount < sc->sc_flash.sc_flashdev->pagesize) { bp->b_error = EINVAL; goto bad; } /* Allocate a temporary buffer for one flash block. */ bufsize = sc->sc_flash.sc_flashdev->blkpages * sc->sc_flash.sc_flashdev->pagesize; buf = (u_char *)malloc(bufsize, M_DEVBUF, M_NOWAIT); if (buf == NULL) { bp->b_error = ENOMEM; goto bad; } /* Allocate a temporary buffer for one spare area. */ oobsize = sc->sc_flash.sc_flashdev->oobsize; oob = (u_char *)malloc(oobsize, M_DEVBUF, M_NOWAIT); if (oob == NULL) { bp->b_error = ENOMEM; goto bad; } /* Read the old logical block into the temporary buffer. */ oblkno = sp->sp_logmap[logno]; if (oblkno != UINT_MAX) { error = flash_chip_read_block(&sc->sc_flash, oblkno, buf); if (error != 0) { bp->b_error = error; goto bad; } } else /* Unused logical blocks read as all 0xff. */ memset(buf, 0xff, bufsize); /* Transfer the page into the logical block buffer. */ bcopy(bp->b_data, buf + logofs * sc->sc_flash.sc_flashdev->pagesize, sc->sc_flash.sc_flashdev->pagesize); /* Generate OOB data for the spare area of this logical block. */ memset(oob, 0xff, oobsize); zflash_oob_set_status(sc, oob, P_NORMALBLOCK); zflash_oob_set_logno(sc, oob, logno); while (1) { /* Search for a free physical block. */ nblkno = zflash_safe_next_block(sp); if (nblkno == UINT_MAX) { printf("%s: no spare block, giving up on logical" " block %u\n", sc->sc_flash.sc_dev.dv_xname, logno); bp->b_error = ENOSPC; goto bad; } #if 0 DPRINTF(("%s: moving logical block %u from physical %u to %u\n", sc->sc_flash.sc_dev.dv_xname, logno, oblkno, nblkno)); #endif /* Erase the free physical block. */ if (flash_chip_erase_block(&sc->sc_flash, nblkno) != 0) { printf("%s: can't erase block %u, retrying\n", sc->sc_flash.sc_dev.dv_xname, nblkno); sp->sp_phyuse[nblkno] = P_POSTBADBLOCK | P_DUST; continue; } /* Write the logical block to the free physical block. */ if (flash_chip_write_block(&sc->sc_flash, nblkno, buf, oob)) { printf("%s: can't write block %u, retrying\n", sc->sc_flash.sc_dev.dv_xname, nblkno); goto trynext; } /* Yeah, we re-wrote that logical block! */ break; trynext: sp->sp_phyuse[nblkno] = P_POSTBADBLOCK | P_DUST; (void)flash_chip_erase_block(&sc->sc_flash, nblkno); } /* Map the new physical block. */ sp->sp_logmap[logno] = nblkno; sp->sp_phyuse[nblkno] = PHYUSE_STATUS(sp->sp_phyuse[nblkno]) | P_LOGICAL; /* Erase the old physical block. */ if (oblkno != UINT_MAX) { sp->sp_phyuse[oblkno] = PHYUSE_STATUS(sp->sp_phyuse[oblkno]) | P_DUST; error = flash_chip_erase_block(&sc->sc_flash, oblkno); if (error != 0) { printf("%s: can't erase old block %u\n", sc->sc_flash.sc_dev.dv_xname, oblkno); bp->b_error = error; goto bad; } } bp->b_resid = bp->b_bcount - sc->sc_flash.sc_flashdev->pagesize; free(oob, M_DEVBUF); free(buf, M_DEVBUF); return; bad: bp->b_flags |= B_ERROR; if (oob != NULL) free(oob, M_DEVBUF); if (buf != NULL) free(buf, M_DEVBUF); } int zflash_safe_start(struct zflash_softc *sc, dev_t dev) { u_char oob[FLASH_MAXOOBSIZE]; struct disklabel *lp = sc->sc_flash.sc_dk.dk_label; struct zflash_safe *sp; u_int16_t *phyuse; u_int *logmap; u_int blksect; u_int blkno; u_int logno; u_int unusable; int part; part = flashpart(dev); if (sc->sc_safe[part] != NULL) return 0; /* We can only handle so much OOB data here. */ if (sc->sc_flash.sc_flashdev->oobsize > FLASH_MAXOOBSIZE) return EIO; /* Safe partitions must start on a flash block boundary. */ blksect = (sc->sc_flash.sc_flashdev->blkpages * sc->sc_flash.sc_flashdev->pagesize) / lp->d_secsize; if (DL_GETPOFFSET(&lp->d_partitions[part]) % blksect) return EIO; sp = malloc(sizeof(*sp), M_DEVBUF, M_NOWAIT | M_ZERO); if (sp == NULL) return ENOMEM; sp->sp_dev = dev; sp->sp_pblks = DL_GETPSIZE(&lp->d_partitions[part]) / blksect; sp->sp_lblks = sp->sp_pblks; /* Try to reserve a number of spare physical blocks. */ switch (sc->sc_flash.sc_flashdev->id) { case FLASH_DEVICE_SAMSUNG_K9F2808U0C: sp->sp_lblks -= 24; /* C3000 */ break; case FLASH_DEVICE_SAMSUNG_K9F1G08U0A: sp->sp_lblks -= 4; /* C3100 */ break; } DPRINTF(("pblks %u lblks %u\n", sp->sp_pblks, sp->sp_lblks)); /* Next physical block to use; randomize for wear-leveling. */ sp->sp_pnext = arc4random() % sp->sp_pblks; /* Allocate physical block usage map. */ phyuse = (u_int16_t *)malloc(sp->sp_pblks * sizeof(u_int16_t), M_DEVBUF, M_NOWAIT); if (phyuse == NULL) { FREE(sp, M_DEVBUF); return ENOMEM; } sp->sp_phyuse = phyuse; /* Allocate logical to physical block map. */ logmap = (u_int *)malloc(sp->sp_lblks * sizeof(u_int), M_DEVBUF, M_NOWAIT); if (logmap == NULL) { FREE(phyuse, M_DEVBUF); FREE(sp, M_DEVBUF); return ENOMEM; } sp->sp_logmap = logmap; /* Initialize the physical and logical block maps. */ for (blkno = 0; blkno < sp->sp_pblks; blkno++) phyuse[blkno] = P_BADBLOCK | P_DUST; for (blkno = 0; blkno < sp->sp_lblks; blkno++) logmap[blkno] = UINT_MAX; /* Update physical block usage map with real data. */ unusable = 0; flash_chip_enable(&sc->sc_flash); for (blkno = 0; blkno < sp->sp_pblks; blkno++) { long pageno; pageno = blkno * sc->sc_flash.sc_flashdev->blkpages; if (flash_chip_read_oob(&sc->sc_flash, pageno, oob) != 0) { DPRINTF(("blkno %u: can't read oob data\n", blkno)); phyuse[blkno] = P_POSTBADBLOCK | P_DUST; unusable++; continue; } phyuse[blkno] = zflash_oob_status(sc, oob); if (PHYUSE_STATUS(phyuse[blkno]) != P_NORMALBLOCK) { DPRINTF(("blkno %u: badblock status %x\n", blkno, PHYUSE_STATUS(phyuse[blkno]))); phyuse[blkno] |= P_DUST; unusable++; continue; } logno = zflash_oob_logno(sc, oob); if (logno == UINT_MAX) { DPRINTF(("blkno %u: can't read logno\n", blkno)); phyuse[blkno] |= P_JFFS2; unusable++; continue; } if (logno == USHRT_MAX) { phyuse[blkno] |= P_DUST; /* Block is usable and available. */ continue; } if (logno >= sp->sp_lblks) { DPRINTF(("blkno %u: logno %u too big\n", blkno, logno)); phyuse[blkno] |= P_JFFS2; unusable++; continue; } if (logmap[logno] == UINT_MAX) { phyuse[blkno] |= P_LOGICAL; logmap[logno] = blkno; } else { /* Duplicate logical block! */ DPRINTF(("blkno %u: duplicate logno %u\n", blkno, logno)); phyuse[blkno] |= P_DUST; } } flash_chip_disable(&sc->sc_flash); if (unusable > 0) printf("%s: %u unusable blocks\n", sc->sc_flash.sc_dev.dv_xname, unusable); sc->sc_safe[part] = sp; return 0; } void zflash_safe_stop(struct zflash_softc *sc, dev_t dev) { struct zflash_safe *sp; int part; part = flashpart(dev); if (sc->sc_safe[part] == NULL) return; sp = sc->sc_safe[part]; free(sp->sp_phyuse, M_DEVBUF); free(sp->sp_logmap, M_DEVBUF); free(sp, M_DEVBUF); sc->sc_safe[part] = NULL; } u_int zflash_safe_next_block(struct zflash_safe *sp) { u_int blkno; for (blkno = sp->sp_pnext; blkno < sp->sp_pblks; blkno++) if (sp->sp_phyuse[blkno] == (P_NORMALBLOCK|P_DUST)) { sp->sp_pnext = blkno + 1; return blkno; } for (blkno = 0; blkno < sp->sp_pnext; blkno++) if (sp->sp_phyuse[blkno] == (P_NORMALBLOCK|P_DUST)) { sp->sp_pnext = blkno + 1; return blkno; } return UINT_MAX; } /* * Correct single bit errors in the block's status byte. */ u_char zflash_oob_status_decode(u_char status) { u_char bit; int count; /* Speed-up. */ if (status == 0xff) return 0xff; /* Count the number of bits set in the byte. */ for (count = 0, bit = 0x01; bit != 0x00; bit <<= 1) if ((status & bit) != 0) count++; return (count > 6) ? 0xff : 0x00; } /* * Decode the block's status byte into a value for the phyuse map. */ u_int16_t zflash_oob_status(struct zflash_softc *sc, u_char *oob) { u_char status; status = zflash_oob_status_decode(oob[sc->sc_ioobbadblk]); if (status != 0xff) return P_BADBLOCK; status = zflash_oob_status_decode(oob[sc->sc_ioobpostbadblk]); if (status != 0xff) return P_POSTBADBLOCK; return P_NORMALBLOCK; } /* * Extract the 16-bit logical block number corresponding to a physical * block from the physical block's OOB data. */ u_int zflash_oob_logno(struct zflash_softc *sc, u_char *oob) { int idx_lo, idx_hi; u_int16_t word; u_int16_t bit; int parity; /* Find a matching pair of high and low bytes. */ if (oob[OOB_LOGADDR_0_LO] == oob[OOB_LOGADDR_1_LO] && oob[OOB_LOGADDR_0_HI] == oob[OOB_LOGADDR_1_HI]) { idx_lo = OOB_LOGADDR_0_LO; idx_hi = OOB_LOGADDR_0_HI; } else if (oob[OOB_LOGADDR_1_LO] == oob[OOB_LOGADDR_2_LO] && oob[OOB_LOGADDR_1_HI] == oob[OOB_LOGADDR_2_HI]) { idx_lo = OOB_LOGADDR_1_LO; idx_hi = OOB_LOGADDR_1_HI; } else if (oob[OOB_LOGADDR_2_LO] == oob[OOB_LOGADDR_0_LO] && oob[OOB_LOGADDR_2_HI] == oob[OOB_LOGADDR_0_HI]) { idx_lo = OOB_LOGADDR_2_LO; idx_hi = OOB_LOGADDR_2_HI; } else /* Block's OOB data may be invalid. */ return UINT_MAX; word = ((u_int16_t)oob[idx_lo] << 0) | ((u_int16_t)oob[idx_hi] << 8); /* Check for parity error in the logical block number. */ for (parity = 0, bit = 0x0001; bit != 0x0000; bit <<= 1) if ((word & bit) != 0) parity++; if ((parity & 1) != 0) return UINT_MAX; /* No logical block number assigned to this block? */ if (word == USHRT_MAX) return word; /* Return the validated logical block number. */ return (word & 0x07fe) >> 1; } void zflash_oob_set_status(struct zflash_softc *sc, u_char *oob, u_int16_t phyuse) { switch (PHYUSE_STATUS(phyuse)) { case P_NORMALBLOCK: oob[sc->sc_ioobbadblk] = 0xff; oob[sc->sc_ioobpostbadblk] = 0xff; break; case P_BADBLOCK: oob[sc->sc_ioobbadblk] = 0x00; oob[sc->sc_ioobpostbadblk] = 0x00; break; case P_POSTBADBLOCK: oob[sc->sc_ioobbadblk] = 0xff; oob[sc->sc_ioobpostbadblk] = 0x00; break; } } void zflash_oob_set_logno(struct zflash_softc *sc, u_char *oob, u_int logno) { u_int16_t word; u_int16_t bit; u_char lo; u_char hi; int parity; /* Why do we set the most significant bit? */ word = ((logno & 0x03ff) << 1) | 0x1000; /* Calculate the parity. */ for (bit = 0x0001; bit != 0x0000; bit <<= 1) if ((word & bit) != 0) parity++; if ((parity & 1) != 0) word |= 0x0001; lo = word & 0x00ff; hi = (word & 0xff00) >> 8; oob[OOB_LOGADDR_0_LO] = lo; oob[OOB_LOGADDR_0_HI] = hi; oob[OOB_LOGADDR_1_LO] = lo; oob[OOB_LOGADDR_1_HI] = hi; oob[OOB_LOGADDR_2_LO] = lo; oob[OOB_LOGADDR_2_HI] = hi; }