--- /dev/null
+/*
+ * (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>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fuse.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#ifndef CONFIG_MPC512X
+#include <asm/arch/imx-regs.h>
+#endif
+#if defined(CONFIG_MX51) || defined(CONFIG_MX53)
+#include <asm/arch/clock.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];
+};
+
+#if !defined(CONFIG_MX51) && !defined(CONFIG_MX53)
+#define enable_efuse_prog_supply(enable)
+#endif
+
+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;
+
+ enable_efuse_prog_supply(1);
+ for (bit = 0; val; bit++, val >>= 1)
+ if (val & 0x01) {
+ ret = prog_bit(regs, bank, word, bit);
+ if (ret) {
+ enable_efuse_prog_supply(0);
+ return ret;
+ }
+ }
+ enable_efuse_prog_supply(0);
+
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff