632 lines
15 KiB
C
632 lines
15 KiB
C
/*
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* Copyright (C) 2017 Free Electrons
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* Copyright (C) 2017 NextThing Co
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*
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* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mtd/rawnand.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#define NAND_HYNIX_CMD_SET_PARAMS 0x36
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#define NAND_HYNIX_CMD_APPLY_PARAMS 0x16
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#define NAND_HYNIX_1XNM_RR_REPEAT 8
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/**
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* struct hynix_read_retry - read-retry data
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* @nregs: number of register to set when applying a new read-retry mode
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* @regs: register offsets (NAND chip dependent)
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* @values: array of values to set in registers. The array size is equal to
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* (nregs * nmodes)
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*/
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struct hynix_read_retry {
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int nregs;
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const u8 *regs;
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u8 values[0];
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};
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/**
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* struct hynix_nand - private Hynix NAND struct
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* @nand_technology: manufacturing process expressed in picometer
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* @read_retry: read-retry information
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*/
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struct hynix_nand {
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const struct hynix_read_retry *read_retry;
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};
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/**
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* struct hynix_read_retry_otp - structure describing how the read-retry OTP
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* area
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* @nregs: number of hynix private registers to set before reading the reading
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* the OTP area
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* @regs: registers that should be configured
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* @values: values that should be set in regs
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* @page: the address to pass to the READ_PAGE command. Depends on the NAND
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* chip
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* @size: size of the read-retry OTP section
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*/
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struct hynix_read_retry_otp {
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int nregs;
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const u8 *regs;
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const u8 *values;
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int page;
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int size;
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};
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static bool hynix_nand_has_valid_jedecid(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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u8 jedecid[6] = { };
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int i = 0;
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chip->cmdfunc(mtd, NAND_CMD_READID, 0x40, -1);
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for (i = 0; i < 5; i++)
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jedecid[i] = chip->read_byte(mtd);
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return !strcmp("JEDEC", jedecid);
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}
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static int hynix_nand_setup_read_retry(struct mtd_info *mtd, int retry_mode)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
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const u8 *values;
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int status;
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int i;
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values = hynix->read_retry->values +
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(retry_mode * hynix->read_retry->nregs);
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/* Enter 'Set Hynix Parameters' mode */
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, -1, -1);
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/*
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* Configure the NAND in the requested read-retry mode.
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* This is done by setting pre-defined values in internal NAND
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* registers.
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*
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* The set of registers is NAND specific, and the values are either
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* predefined or extracted from an OTP area on the NAND (values are
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* probably tweaked at production in this case).
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*/
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for (i = 0; i < hynix->read_retry->nregs; i++) {
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int column = hynix->read_retry->regs[i];
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column |= column << 8;
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chip->cmdfunc(mtd, NAND_CMD_NONE, column, -1);
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chip->write_byte(mtd, values[i]);
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}
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/* Apply the new settings. */
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
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status = chip->waitfunc(mtd, chip);
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if (status & NAND_STATUS_FAIL)
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return -EIO;
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return 0;
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}
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/**
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* hynix_get_majority - get the value that is occurring the most in a given
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* set of values
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* @in: the array of values to test
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* @repeat: the size of the in array
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* @out: pointer used to store the output value
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*
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* This function implements the 'majority check' logic that is supposed to
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* overcome the unreliability of MLC NANDs when reading the OTP area storing
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* the read-retry parameters.
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*
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* It's based on a pretty simple assumption: if we repeat the same value
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* several times and then take the one that is occurring the most, we should
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* find the correct value.
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* Let's hope this dummy algorithm prevents us from losing the read-retry
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* parameters.
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*/
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static int hynix_get_majority(const u8 *in, int repeat, u8 *out)
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{
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int i, j, half = repeat / 2;
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/*
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* We only test the first half of the in array because we must ensure
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* that the value is at least occurring repeat / 2 times.
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*
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* This loop is suboptimal since we may count the occurrences of the
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* same value several time, but we are doing that on small sets, which
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* makes it acceptable.
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*/
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for (i = 0; i < half; i++) {
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int cnt = 0;
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u8 val = in[i];
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/* Count all values that are matching the one at index i. */
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for (j = i + 1; j < repeat; j++) {
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if (in[j] == val)
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cnt++;
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}
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/* We found a value occurring more than repeat / 2. */
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if (cnt > half) {
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*out = val;
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return 0;
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}
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}
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return -EIO;
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}
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static int hynix_read_rr_otp(struct nand_chip *chip,
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const struct hynix_read_retry_otp *info,
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void *buf)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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int i;
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chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, -1, -1);
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for (i = 0; i < info->nregs; i++) {
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int column = info->regs[i];
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column |= column << 8;
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chip->cmdfunc(mtd, NAND_CMD_NONE, column, -1);
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chip->write_byte(mtd, info->values[i]);
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}
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
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/* Sequence to enter OTP mode? */
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chip->cmdfunc(mtd, 0x17, -1, -1);
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chip->cmdfunc(mtd, 0x04, -1, -1);
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chip->cmdfunc(mtd, 0x19, -1, -1);
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/* Now read the page */
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chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, info->page);
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chip->read_buf(mtd, buf, info->size);
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/* Put everything back to normal */
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chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_SET_PARAMS, 0x38, -1);
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chip->write_byte(mtd, 0x0);
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chip->cmdfunc(mtd, NAND_HYNIX_CMD_APPLY_PARAMS, -1, -1);
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chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, -1);
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return 0;
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}
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#define NAND_HYNIX_1XNM_RR_COUNT_OFFS 0
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#define NAND_HYNIX_1XNM_RR_REG_COUNT_OFFS 8
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#define NAND_HYNIX_1XNM_RR_SET_OFFS(x, setsize, inv) \
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(16 + ((((x) * 2) + ((inv) ? 1 : 0)) * (setsize)))
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static int hynix_mlc_1xnm_rr_value(const u8 *buf, int nmodes, int nregs,
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int mode, int reg, bool inv, u8 *val)
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{
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u8 tmp[NAND_HYNIX_1XNM_RR_REPEAT];
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int val_offs = (mode * nregs) + reg;
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int set_size = nmodes * nregs;
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int i, ret;
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for (i = 0; i < NAND_HYNIX_1XNM_RR_REPEAT; i++) {
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int set_offs = NAND_HYNIX_1XNM_RR_SET_OFFS(i, set_size, inv);
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tmp[i] = buf[val_offs + set_offs];
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}
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ret = hynix_get_majority(tmp, NAND_HYNIX_1XNM_RR_REPEAT, val);
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if (ret)
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return ret;
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if (inv)
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*val = ~*val;
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return 0;
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}
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static u8 hynix_1xnm_mlc_read_retry_regs[] = {
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0xcc, 0xbf, 0xaa, 0xab, 0xcd, 0xad, 0xae, 0xaf
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};
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static int hynix_mlc_1xnm_rr_init(struct nand_chip *chip,
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const struct hynix_read_retry_otp *info)
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{
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struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
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struct hynix_read_retry *rr = NULL;
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int ret, i, j;
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u8 nregs, nmodes;
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u8 *buf;
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buf = kmalloc(info->size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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ret = hynix_read_rr_otp(chip, info, buf);
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if (ret)
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goto out;
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ret = hynix_get_majority(buf, NAND_HYNIX_1XNM_RR_REPEAT,
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&nmodes);
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if (ret)
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goto out;
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ret = hynix_get_majority(buf + NAND_HYNIX_1XNM_RR_REPEAT,
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NAND_HYNIX_1XNM_RR_REPEAT,
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&nregs);
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if (ret)
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goto out;
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rr = kzalloc(sizeof(*rr) + (nregs * nmodes), GFP_KERNEL);
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if (!rr) {
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ret = -ENOMEM;
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goto out;
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}
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for (i = 0; i < nmodes; i++) {
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for (j = 0; j < nregs; j++) {
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u8 *val = rr->values + (i * nregs);
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ret = hynix_mlc_1xnm_rr_value(buf, nmodes, nregs, i, j,
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false, val);
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if (!ret)
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continue;
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ret = hynix_mlc_1xnm_rr_value(buf, nmodes, nregs, i, j,
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true, val);
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if (ret)
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goto out;
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}
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}
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rr->nregs = nregs;
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rr->regs = hynix_1xnm_mlc_read_retry_regs;
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hynix->read_retry = rr;
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chip->setup_read_retry = hynix_nand_setup_read_retry;
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chip->read_retries = nmodes;
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out:
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kfree(buf);
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if (ret)
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kfree(rr);
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return ret;
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}
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static const u8 hynix_mlc_1xnm_rr_otp_regs[] = { 0x38 };
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static const u8 hynix_mlc_1xnm_rr_otp_values[] = { 0x52 };
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static const struct hynix_read_retry_otp hynix_mlc_1xnm_rr_otps[] = {
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{
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.nregs = ARRAY_SIZE(hynix_mlc_1xnm_rr_otp_regs),
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.regs = hynix_mlc_1xnm_rr_otp_regs,
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.values = hynix_mlc_1xnm_rr_otp_values,
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.page = 0x21f,
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.size = 784
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},
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{
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.nregs = ARRAY_SIZE(hynix_mlc_1xnm_rr_otp_regs),
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.regs = hynix_mlc_1xnm_rr_otp_regs,
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.values = hynix_mlc_1xnm_rr_otp_values,
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.page = 0x200,
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.size = 528,
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},
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};
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static int hynix_nand_rr_init(struct nand_chip *chip)
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{
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int i, ret = 0;
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bool valid_jedecid;
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valid_jedecid = hynix_nand_has_valid_jedecid(chip);
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/*
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* We only support read-retry for 1xnm NANDs, and those NANDs all
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* expose a valid JEDEC ID.
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*/
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if (valid_jedecid) {
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u8 nand_tech = chip->id.data[5] >> 4;
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/* 1xnm technology */
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if (nand_tech == 4) {
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for (i = 0; i < ARRAY_SIZE(hynix_mlc_1xnm_rr_otps);
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i++) {
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/*
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* FIXME: Hynix recommend to copy the
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* read-retry OTP area into a normal page.
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*/
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ret = hynix_mlc_1xnm_rr_init(chip,
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hynix_mlc_1xnm_rr_otps);
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if (!ret)
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break;
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}
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}
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}
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if (ret)
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pr_warn("failed to initialize read-retry infrastructure");
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return 0;
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}
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static void hynix_nand_extract_oobsize(struct nand_chip *chip,
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bool valid_jedecid)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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u8 oobsize;
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oobsize = ((chip->id.data[3] >> 2) & 0x3) |
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((chip->id.data[3] >> 4) & 0x4);
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if (valid_jedecid) {
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switch (oobsize) {
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case 0:
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mtd->oobsize = 2048;
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break;
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case 1:
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mtd->oobsize = 1664;
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break;
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case 2:
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mtd->oobsize = 1024;
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break;
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case 3:
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mtd->oobsize = 640;
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break;
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default:
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/*
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* We should never reach this case, but if that
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* happens, this probably means Hynix decided to use
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* a different extended ID format, and we should find
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* a way to support it.
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*/
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WARN(1, "Invalid OOB size");
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break;
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}
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} else {
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switch (oobsize) {
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case 0:
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mtd->oobsize = 128;
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break;
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case 1:
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mtd->oobsize = 224;
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break;
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case 2:
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mtd->oobsize = 448;
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break;
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case 3:
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mtd->oobsize = 64;
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break;
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case 4:
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mtd->oobsize = 32;
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break;
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case 5:
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mtd->oobsize = 16;
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break;
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case 6:
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mtd->oobsize = 640;
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break;
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default:
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/*
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* We should never reach this case, but if that
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* happens, this probably means Hynix decided to use
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* a different extended ID format, and we should find
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* a way to support it.
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*/
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WARN(1, "Invalid OOB size");
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break;
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}
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}
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}
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static void hynix_nand_extract_ecc_requirements(struct nand_chip *chip,
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bool valid_jedecid)
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{
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u8 ecc_level = (chip->id.data[4] >> 4) & 0x7;
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if (valid_jedecid) {
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/* Reference: H27UCG8T2E datasheet */
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chip->ecc_step_ds = 1024;
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switch (ecc_level) {
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case 0:
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chip->ecc_step_ds = 0;
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chip->ecc_strength_ds = 0;
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break;
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case 1:
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chip->ecc_strength_ds = 4;
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break;
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case 2:
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chip->ecc_strength_ds = 24;
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break;
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case 3:
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chip->ecc_strength_ds = 32;
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break;
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case 4:
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chip->ecc_strength_ds = 40;
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break;
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case 5:
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chip->ecc_strength_ds = 50;
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break;
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case 6:
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chip->ecc_strength_ds = 60;
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break;
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default:
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/*
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* We should never reach this case, but if that
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* happens, this probably means Hynix decided to use
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* a different extended ID format, and we should find
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* a way to support it.
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*/
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WARN(1, "Invalid ECC requirements");
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}
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} else {
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/*
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* The ECC requirements field meaning depends on the
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* NAND technology.
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*/
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u8 nand_tech = chip->id.data[5] & 0x7;
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if (nand_tech < 3) {
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/* > 26nm, reference: H27UBG8T2A datasheet */
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if (ecc_level < 5) {
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chip->ecc_step_ds = 512;
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chip->ecc_strength_ds = 1 << ecc_level;
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} else if (ecc_level < 7) {
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if (ecc_level == 5)
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chip->ecc_step_ds = 2048;
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else
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chip->ecc_step_ds = 1024;
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chip->ecc_strength_ds = 24;
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} else {
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/*
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* We should never reach this case, but if that
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* happens, this probably means Hynix decided
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* to use a different extended ID format, and
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* we should find a way to support it.
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*/
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WARN(1, "Invalid ECC requirements");
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}
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} else {
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/* <= 26nm, reference: H27UBG8T2B datasheet */
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if (!ecc_level) {
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chip->ecc_step_ds = 0;
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chip->ecc_strength_ds = 0;
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} else if (ecc_level < 5) {
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chip->ecc_step_ds = 512;
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chip->ecc_strength_ds = 1 << (ecc_level - 1);
|
|
} else {
|
|
chip->ecc_step_ds = 1024;
|
|
chip->ecc_strength_ds = 24 +
|
|
(8 * (ecc_level - 5));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void hynix_nand_extract_scrambling_requirements(struct nand_chip *chip,
|
|
bool valid_jedecid)
|
|
{
|
|
u8 nand_tech;
|
|
|
|
/* We need scrambling on all TLC NANDs*/
|
|
if (chip->bits_per_cell > 2)
|
|
chip->options |= NAND_NEED_SCRAMBLING;
|
|
|
|
/* And on MLC NANDs with sub-3xnm process */
|
|
if (valid_jedecid) {
|
|
nand_tech = chip->id.data[5] >> 4;
|
|
|
|
/* < 3xnm */
|
|
if (nand_tech > 0)
|
|
chip->options |= NAND_NEED_SCRAMBLING;
|
|
} else {
|
|
nand_tech = chip->id.data[5] & 0x7;
|
|
|
|
/* < 32nm */
|
|
if (nand_tech > 2)
|
|
chip->options |= NAND_NEED_SCRAMBLING;
|
|
}
|
|
}
|
|
|
|
static void hynix_nand_decode_id(struct nand_chip *chip)
|
|
{
|
|
struct mtd_info *mtd = nand_to_mtd(chip);
|
|
bool valid_jedecid;
|
|
u8 tmp;
|
|
|
|
/*
|
|
* Exclude all SLC NANDs from this advanced detection scheme.
|
|
* According to the ranges defined in several datasheets, it might
|
|
* appear that even SLC NANDs could fall in this extended ID scheme.
|
|
* If that the case rework the test to let SLC NANDs go through the
|
|
* detection process.
|
|
*/
|
|
if (chip->id.len < 6 || nand_is_slc(chip)) {
|
|
nand_decode_ext_id(chip);
|
|
return;
|
|
}
|
|
|
|
/* Extract pagesize */
|
|
mtd->writesize = 2048 << (chip->id.data[3] & 0x03);
|
|
|
|
tmp = (chip->id.data[3] >> 4) & 0x3;
|
|
/*
|
|
* When bit7 is set that means we start counting at 1MiB, otherwise
|
|
* we start counting at 128KiB and shift this value the content of
|
|
* ID[3][4:5].
|
|
* The only exception is when ID[3][4:5] == 3 and ID[3][7] == 0, in
|
|
* this case the erasesize is set to 768KiB.
|
|
*/
|
|
if (chip->id.data[3] & 0x80)
|
|
mtd->erasesize = SZ_1M << tmp;
|
|
else if (tmp == 3)
|
|
mtd->erasesize = SZ_512K + SZ_256K;
|
|
else
|
|
mtd->erasesize = SZ_128K << tmp;
|
|
|
|
/*
|
|
* Modern Toggle DDR NANDs have a valid JEDECID even though they are
|
|
* not exposing a valid JEDEC parameter table.
|
|
* These NANDs use a different NAND ID scheme.
|
|
*/
|
|
valid_jedecid = hynix_nand_has_valid_jedecid(chip);
|
|
|
|
hynix_nand_extract_oobsize(chip, valid_jedecid);
|
|
hynix_nand_extract_ecc_requirements(chip, valid_jedecid);
|
|
hynix_nand_extract_scrambling_requirements(chip, valid_jedecid);
|
|
}
|
|
|
|
static void hynix_nand_cleanup(struct nand_chip *chip)
|
|
{
|
|
struct hynix_nand *hynix = nand_get_manufacturer_data(chip);
|
|
|
|
if (!hynix)
|
|
return;
|
|
|
|
kfree(hynix->read_retry);
|
|
kfree(hynix);
|
|
nand_set_manufacturer_data(chip, NULL);
|
|
}
|
|
|
|
static int hynix_nand_init(struct nand_chip *chip)
|
|
{
|
|
struct hynix_nand *hynix;
|
|
int ret;
|
|
|
|
if (!nand_is_slc(chip))
|
|
chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
|
|
else
|
|
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
|
|
|
|
hynix = kzalloc(sizeof(*hynix), GFP_KERNEL);
|
|
if (!hynix)
|
|
return -ENOMEM;
|
|
|
|
nand_set_manufacturer_data(chip, hynix);
|
|
|
|
ret = hynix_nand_rr_init(chip);
|
|
if (ret)
|
|
hynix_nand_cleanup(chip);
|
|
|
|
return ret;
|
|
}
|
|
|
|
const struct nand_manufacturer_ops hynix_nand_manuf_ops = {
|
|
.detect = hynix_nand_decode_id,
|
|
.init = hynix_nand_init,
|
|
.cleanup = hynix_nand_cleanup,
|
|
};
|