diff options
Diffstat (limited to 'drivers/misc/fsl_iim.c')
| -rw-r--r-- | drivers/misc/fsl_iim.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/misc/fsl_iim.c b/drivers/misc/fsl_iim.c new file mode 100644 index 000000000..9179fbb0d --- /dev/null +++ b/drivers/misc/fsl_iim.c @@ -0,0 +1,286 @@ +/* + * (C) Copyright 2009-2013 ADVANSEE + * Benoît Thébaudeau <benoit.thebaudeau@advansee.com> + * + * Based on the mpc512x iim code: + * Copyright 2008 Silicon Turnkey Express, Inc. + * Martha Marx <mmarx@silicontkx.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <fuse.h> +#include <asm/errno.h> +#include <asm/io.h> +#ifndef CONFIG_MPC512X +#include <asm/arch/imx-regs.h> +#endif + +/* FSL IIM-specific constants */ +#define STAT_BUSY 0x80 +#define STAT_PRGD 0x02 +#define STAT_SNSD 0x01 + +#define STATM_PRGD_M 0x02 +#define STATM_SNSD_M 0x01 + +#define ERR_PRGE 0x80 +#define ERR_WPE 0x40 +#define ERR_OPE 0x20 +#define ERR_RPE 0x10 +#define ERR_WLRE 0x08 +#define ERR_SNSE 0x04 +#define ERR_PARITYE 0x02 + +#define EMASK_PRGE_M 0x80 +#define EMASK_WPE_M 0x40 +#define EMASK_OPE_M 0x20 +#define EMASK_RPE_M 0x10 +#define EMASK_WLRE_M 0x08 +#define EMASK_SNSE_M 0x04 +#define EMASK_PARITYE_M 0x02 + +#define FCTL_DPC 0x80 +#define FCTL_PRG_LENGTH_MASK 0x70 +#define FCTL_ESNS_N 0x08 +#define FCTL_ESNS_0 0x04 +#define FCTL_ESNS_1 0x02 +#define FCTL_PRG 0x01 + +#define UA_A_BANK_MASK 0x38 +#define UA_A_ROWH_MASK 0x07 + +#define LA_A_ROWL_MASK 0xf8 +#define LA_A_BIT_MASK 0x07 + +#define PREV_PROD_REV_MASK 0xf8 +#define PREV_PROD_VT_MASK 0x07 + +/* Select the correct accessors depending on endianness */ +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define iim_read32 in_le32 +#define iim_write32 out_le32 +#define iim_clrsetbits32 clrsetbits_le32 +#define iim_clrbits32 clrbits_le32 +#define iim_setbits32 setbits_le32 +#elif __BYTE_ORDER == __BIG_ENDIAN +#define iim_read32 in_be32 +#define iim_write32 out_be32 +#define iim_clrsetbits32 clrsetbits_be32 +#define iim_clrbits32 clrbits_be32 +#define iim_setbits32 setbits_be32 +#else +#error Endianess is not defined: please fix to continue +#endif + +/* IIM control registers */ +struct fsl_iim { + u32 stat; + u32 statm; + u32 err; + u32 emask; + u32 fctl; + u32 ua; + u32 la; + u32 sdat; + u32 prev; + u32 srev; + u32 prg_p; + u32 scs[0x1f5]; + struct { + u32 word[0x100]; + } bank[8]; +}; + +static int prepare_access(struct fsl_iim **regs, u32 bank, u32 word, int assert, + const char *caller) +{ + *regs = (struct fsl_iim *)IIM_BASE_ADDR; + + if (bank >= ARRAY_SIZE((*regs)->bank) || + word >= ARRAY_SIZE((*regs)->bank[0].word) || + !assert) { + printf("fsl_iim %s(): Invalid argument\n", caller); + return -EINVAL; + } + + return 0; +} + +static void clear_status(struct fsl_iim *regs) +{ + iim_setbits32(®s->stat, 0); + iim_setbits32(®s->err, 0); +} + +static void finish_access(struct fsl_iim *regs, u32 *stat, u32 *err) +{ + *stat = iim_read32(®s->stat); + *err = iim_read32(®s->err); + clear_status(regs); +} + +static int prepare_read(struct fsl_iim **regs, u32 bank, u32 word, u32 *val, + const char *caller) +{ + int ret; + + ret = prepare_access(regs, bank, word, val != NULL, caller); + if (ret) + return ret; + + clear_status(*regs); + + return 0; +} + +int fuse_read(u32 bank, u32 word, u32 *val) +{ + struct fsl_iim *regs; + u32 stat, err; + int ret; + + ret = prepare_read(®s, bank, word, val, __func__); + if (ret) + return ret; + + *val = iim_read32(®s->bank[bank].word[word]); + finish_access(regs, &stat, &err); + + if (err & ERR_RPE) { + puts("fsl_iim fuse_read(): Read protect error\n"); + return -EIO; + } + + return 0; +} + +static void direct_access(struct fsl_iim *regs, u32 bank, u32 word, u32 bit, + u32 fctl, u32 *stat, u32 *err) +{ + iim_write32(®s->ua, bank << 3 | word >> 5); + iim_write32(®s->la, (word << 3 | bit) & 0xff); + if (fctl == FCTL_PRG) + iim_write32(®s->prg_p, 0xaa); + iim_setbits32(®s->fctl, fctl); + while (iim_read32(®s->stat) & STAT_BUSY) + udelay(20); + finish_access(regs, stat, err); +} + +int fuse_sense(u32 bank, u32 word, u32 *val) +{ + struct fsl_iim *regs; + u32 stat, err; + int ret; + + ret = prepare_read(®s, bank, word, val, __func__); + if (ret) + return ret; + + direct_access(regs, bank, word, 0, FCTL_ESNS_N, &stat, &err); + + if (err & ERR_SNSE) { + puts("fsl_iim fuse_sense(): Explicit sense cycle error\n"); + return -EIO; + } + + if (!(stat & STAT_SNSD)) { + puts("fsl_iim fuse_sense(): Explicit sense cycle did not complete\n"); + return -EIO; + } + + *val = iim_read32(®s->sdat); + return 0; +} + +static int prog_bit(struct fsl_iim *regs, u32 bank, u32 word, u32 bit) +{ + u32 stat, err; + + clear_status(regs); + direct_access(regs, bank, word, bit, FCTL_PRG, &stat, &err); + iim_write32(®s->prg_p, 0x00); + + if (err & ERR_PRGE) { + puts("fsl_iim fuse_prog(): Program error\n"); + return -EIO; + } + + if (err & ERR_WPE) { + puts("fsl_iim fuse_prog(): Write protect error\n"); + return -EIO; + } + + if (!(stat & STAT_PRGD)) { + puts("fsl_iim fuse_prog(): Program did not complete\n"); + return -EIO; + } + + return 0; +} + +static int prepare_write(struct fsl_iim **regs, u32 bank, u32 word, u32 val, + const char *caller) +{ + return prepare_access(regs, bank, word, !(val & ~0xff), caller); +} + +int fuse_prog(u32 bank, u32 word, u32 val) +{ + struct fsl_iim *regs; + u32 bit; + int ret; + + ret = prepare_write(®s, bank, word, val, __func__); + if (ret) + return ret; + + for (bit = 0; val; bit++, val >>= 1) + if (val & 0x01) { + ret = prog_bit(regs, bank, word, bit); + if (ret) + return ret; + } + + return 0; +} + +int fuse_override(u32 bank, u32 word, u32 val) +{ + struct fsl_iim *regs; + u32 stat, err; + int ret; + + ret = prepare_write(®s, bank, word, val, __func__); + if (ret) + return ret; + + clear_status(regs); + iim_write32(®s->bank[bank].word[word], val); + finish_access(regs, &stat, &err); + + if (err & ERR_OPE) { + puts("fsl_iim fuse_override(): Override protect error\n"); + return -EIO; + } + + return 0; +} |