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https://github.com/brain-hackers/u-boot-brain
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![Sergey Lapin](/assets/img/avatar_default.png)
This patch is essentially an update of u-boot MTD subsystem to the state of Linux-3.7.1 with exclusion of some bits: - the update is concentrated on NAND, no onenand or CFI/NOR/SPI flashes interfaces are updated EXCEPT for API changes. - new large NAND chips support is there, though some updates have got in Linux-3.8.-rc1, (which will follow on top of this patch). To produce this update I used tag v3.7.1 of linux-stable repository. The update was made using application of relevant patches, with changes relevant to U-Boot-only stuff sticked together to keep bisectability. Then all changes were grouped together to this patch. Signed-off-by: Sergey Lapin <slapin@ossfans.org> [scottwood@freescale.com: some eccstrength and build fixes] Signed-off-by: Scott Wood <scottwood@freescale.com>
1057 lines
27 KiB
C
1057 lines
27 KiB
C
/*
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* (C) Copyright 2007-2008
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* Stelian Pop <stelian@popies.net>
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* Lead Tech Design <www.leadtechdesign.com>
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*
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* (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
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*
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* Add Programmable Multibit ECC support for various AT91 SoC
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* (C) Copyright 2012 ATMEL, Hong Xu
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/at91_pio.h>
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#include <nand.h>
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#include <watchdog.h>
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#ifdef CONFIG_ATMEL_NAND_HWECC
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/* Register access macros */
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#define ecc_readl(add, reg) \
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readl(AT91_BASE_SYS + add + ATMEL_ECC_##reg)
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#define ecc_writel(add, reg, value) \
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writel((value), AT91_BASE_SYS + add + ATMEL_ECC_##reg)
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#include "atmel_nand_ecc.h" /* Hardware ECC registers */
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#ifdef CONFIG_ATMEL_NAND_HW_PMECC
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struct atmel_nand_host {
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struct pmecc_regs __iomem *pmecc;
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struct pmecc_errloc_regs __iomem *pmerrloc;
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void __iomem *pmecc_rom_base;
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u8 pmecc_corr_cap;
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u16 pmecc_sector_size;
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u32 pmecc_index_table_offset;
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int pmecc_bytes_per_sector;
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int pmecc_sector_number;
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int pmecc_degree; /* Degree of remainders */
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int pmecc_cw_len; /* Length of codeword */
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/* lookup table for alpha_to and index_of */
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void __iomem *pmecc_alpha_to;
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void __iomem *pmecc_index_of;
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/* data for pmecc computation */
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int16_t pmecc_smu[(CONFIG_PMECC_CAP + 2) * (2 * CONFIG_PMECC_CAP + 1)];
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int16_t pmecc_partial_syn[2 * CONFIG_PMECC_CAP + 1];
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int16_t pmecc_si[2 * CONFIG_PMECC_CAP + 1];
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int16_t pmecc_lmu[CONFIG_PMECC_CAP + 1]; /* polynomal order */
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int pmecc_mu[CONFIG_PMECC_CAP + 1];
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int pmecc_dmu[CONFIG_PMECC_CAP + 1];
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int pmecc_delta[CONFIG_PMECC_CAP + 1];
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};
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static struct atmel_nand_host pmecc_host;
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static struct nand_ecclayout atmel_pmecc_oobinfo;
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/*
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* Return number of ecc bytes per sector according to sector size and
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* correction capability
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*
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* Following table shows what at91 PMECC supported:
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* Correction Capability Sector_512_bytes Sector_1024_bytes
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* ===================== ================ =================
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* 2-bits 4-bytes 4-bytes
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* 4-bits 7-bytes 7-bytes
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* 8-bits 13-bytes 14-bytes
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* 12-bits 20-bytes 21-bytes
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* 24-bits 39-bytes 42-bytes
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*/
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static int pmecc_get_ecc_bytes(int cap, int sector_size)
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{
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int m = 12 + sector_size / 512;
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return (m * cap + 7) / 8;
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}
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static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
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int oobsize, int ecc_len)
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{
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int i;
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layout->eccbytes = ecc_len;
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/* ECC will occupy the last ecc_len bytes continuously */
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for (i = 0; i < ecc_len; i++)
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layout->eccpos[i] = oobsize - ecc_len + i;
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layout->oobfree[0].offset = 2;
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layout->oobfree[0].length =
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oobsize - ecc_len - layout->oobfree[0].offset;
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}
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static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
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{
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int table_size;
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table_size = host->pmecc_sector_size == 512 ?
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PMECC_INDEX_TABLE_SIZE_512 : PMECC_INDEX_TABLE_SIZE_1024;
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/* the ALPHA lookup table is right behind the INDEX lookup table. */
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return host->pmecc_rom_base + host->pmecc_index_table_offset +
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table_size * sizeof(int16_t);
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}
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static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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int i;
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uint32_t value;
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/* Fill odd syndromes */
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for (i = 0; i < host->pmecc_corr_cap; i++) {
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value = readl(&host->pmecc->rem_port[sector].rem[i / 2]);
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if (i & 1)
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value >>= 16;
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value &= 0xffff;
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host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value;
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}
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}
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static void pmecc_substitute(struct mtd_info *mtd)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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int16_t __iomem *alpha_to = host->pmecc_alpha_to;
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int16_t __iomem *index_of = host->pmecc_index_of;
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int16_t *partial_syn = host->pmecc_partial_syn;
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const int cap = host->pmecc_corr_cap;
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int16_t *si;
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int i, j;
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/* si[] is a table that holds the current syndrome value,
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* an element of that table belongs to the field
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*/
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si = host->pmecc_si;
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memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1));
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/* Computation 2t syndromes based on S(x) */
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/* Odd syndromes */
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for (i = 1; i < 2 * cap; i += 2) {
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for (j = 0; j < host->pmecc_degree; j++) {
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if (partial_syn[i] & (0x1 << j))
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si[i] = readw(alpha_to + i * j) ^ si[i];
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}
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}
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/* Even syndrome = (Odd syndrome) ** 2 */
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for (i = 2, j = 1; j <= cap; i = ++j << 1) {
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if (si[j] == 0) {
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si[i] = 0;
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} else {
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int16_t tmp;
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tmp = readw(index_of + si[j]);
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tmp = (tmp * 2) % host->pmecc_cw_len;
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si[i] = readw(alpha_to + tmp);
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}
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}
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}
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/*
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* This function defines a Berlekamp iterative procedure for
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* finding the value of the error location polynomial.
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* The input is si[], initialize by pmecc_substitute().
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* The output is smu[][].
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*
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* This function is written according to chip datasheet Chapter:
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* Find the Error Location Polynomial Sigma(x) of Section:
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* Programmable Multibit ECC Control (PMECC).
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*/
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static void pmecc_get_sigma(struct mtd_info *mtd)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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int16_t *lmu = host->pmecc_lmu;
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int16_t *si = host->pmecc_si;
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int *mu = host->pmecc_mu;
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int *dmu = host->pmecc_dmu; /* Discrepancy */
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int *delta = host->pmecc_delta; /* Delta order */
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int cw_len = host->pmecc_cw_len;
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const int16_t cap = host->pmecc_corr_cap;
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const int num = 2 * cap + 1;
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int16_t __iomem *index_of = host->pmecc_index_of;
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int16_t __iomem *alpha_to = host->pmecc_alpha_to;
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int i, j, k;
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uint32_t dmu_0_count, tmp;
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int16_t *smu = host->pmecc_smu;
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/* index of largest delta */
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int ro;
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int largest;
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int diff;
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/* Init the Sigma(x) */
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memset(smu, 0, sizeof(int16_t) * ARRAY_SIZE(smu));
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dmu_0_count = 0;
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/* First Row */
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/* Mu */
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mu[0] = -1;
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smu[0] = 1;
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/* discrepancy set to 1 */
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dmu[0] = 1;
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/* polynom order set to 0 */
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lmu[0] = 0;
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/* delta[0] = (mu[0] * 2 - lmu[0]) >> 1; */
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delta[0] = -1;
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/* Second Row */
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/* Mu */
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mu[1] = 0;
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/* Sigma(x) set to 1 */
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smu[num] = 1;
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/* discrepancy set to S1 */
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dmu[1] = si[1];
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/* polynom order set to 0 */
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lmu[1] = 0;
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/* delta[1] = (mu[1] * 2 - lmu[1]) >> 1; */
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delta[1] = 0;
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for (i = 1; i <= cap; i++) {
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mu[i + 1] = i << 1;
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/* Begin Computing Sigma (Mu+1) and L(mu) */
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/* check if discrepancy is set to 0 */
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if (dmu[i] == 0) {
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dmu_0_count++;
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tmp = ((cap - (lmu[i] >> 1) - 1) / 2);
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if ((cap - (lmu[i] >> 1) - 1) & 0x1)
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tmp += 2;
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else
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tmp += 1;
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if (dmu_0_count == tmp) {
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for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
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smu[(cap + 1) * num + j] =
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smu[i * num + j];
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lmu[cap + 1] = lmu[i];
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return;
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}
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/* copy polynom */
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for (j = 0; j <= lmu[i] >> 1; j++)
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smu[(i + 1) * num + j] = smu[i * num + j];
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/* copy previous polynom order to the next */
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lmu[i + 1] = lmu[i];
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} else {
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ro = 0;
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largest = -1;
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/* find largest delta with dmu != 0 */
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for (j = 0; j < i; j++) {
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if ((dmu[j]) && (delta[j] > largest)) {
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largest = delta[j];
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ro = j;
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}
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}
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/* compute difference */
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diff = (mu[i] - mu[ro]);
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/* Compute degree of the new smu polynomial */
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if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
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lmu[i + 1] = lmu[i];
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else
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lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
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/* Init smu[i+1] with 0 */
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for (k = 0; k < num; k++)
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smu[(i + 1) * num + k] = 0;
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/* Compute smu[i+1] */
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for (k = 0; k <= lmu[ro] >> 1; k++) {
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int16_t a, b, c;
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if (!(smu[ro * num + k] && dmu[i]))
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continue;
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a = readw(index_of + dmu[i]);
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b = readw(index_of + dmu[ro]);
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c = readw(index_of + smu[ro * num + k]);
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tmp = a + (cw_len - b) + c;
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a = readw(alpha_to + tmp % cw_len);
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smu[(i + 1) * num + (k + diff)] = a;
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}
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for (k = 0; k <= lmu[i] >> 1; k++)
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smu[(i + 1) * num + k] ^= smu[i * num + k];
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}
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/* End Computing Sigma (Mu+1) and L(mu) */
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/* In either case compute delta */
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delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
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/* Do not compute discrepancy for the last iteration */
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if (i >= cap)
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continue;
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for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
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tmp = 2 * (i - 1);
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if (k == 0) {
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dmu[i + 1] = si[tmp + 3];
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} else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
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int16_t a, b, c;
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a = readw(index_of +
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smu[(i + 1) * num + k]);
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b = si[2 * (i - 1) + 3 - k];
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c = readw(index_of + b);
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tmp = a + c;
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tmp %= cw_len;
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dmu[i + 1] = readw(alpha_to + tmp) ^
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dmu[i + 1];
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}
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}
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}
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}
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static int pmecc_err_location(struct mtd_info *mtd)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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const int cap = host->pmecc_corr_cap;
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const int num = 2 * cap + 1;
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int sector_size = host->pmecc_sector_size;
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int err_nbr = 0; /* number of error */
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int roots_nbr; /* number of roots */
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int i;
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uint32_t val;
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int16_t *smu = host->pmecc_smu;
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int timeout = PMECC_MAX_TIMEOUT_US;
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writel(PMERRLOC_DISABLE, &host->pmerrloc->eldis);
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for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) {
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writel(smu[(cap + 1) * num + i], &host->pmerrloc->sigma[i]);
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err_nbr++;
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}
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val = PMERRLOC_ELCFG_NUM_ERRORS(err_nbr - 1);
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if (sector_size == 1024)
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val |= PMERRLOC_ELCFG_SECTOR_1024;
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writel(val, &host->pmerrloc->elcfg);
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writel(sector_size * 8 + host->pmecc_degree * cap,
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&host->pmerrloc->elen);
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while (--timeout) {
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if (readl(&host->pmerrloc->elisr) & PMERRLOC_CALC_DONE)
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break;
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WATCHDOG_RESET();
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udelay(1);
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}
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if (!timeout) {
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printk(KERN_ERR "atmel_nand : Timeout to calculate PMECC error location\n");
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return -1;
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}
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roots_nbr = (readl(&host->pmerrloc->elisr) & PMERRLOC_ERR_NUM_MASK)
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>> 8;
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/* Number of roots == degree of smu hence <= cap */
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if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1)
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return err_nbr - 1;
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/* Number of roots does not match the degree of smu
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* unable to correct error */
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return -1;
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}
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static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
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int sector_num, int extra_bytes, int err_nbr)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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int i = 0;
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int byte_pos, bit_pos, sector_size, pos;
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uint32_t tmp;
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uint8_t err_byte;
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sector_size = host->pmecc_sector_size;
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while (err_nbr) {
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tmp = readl(&host->pmerrloc->el[i]) - 1;
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byte_pos = tmp / 8;
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bit_pos = tmp % 8;
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if (byte_pos >= (sector_size + extra_bytes))
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BUG(); /* should never happen */
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if (byte_pos < sector_size) {
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err_byte = *(buf + byte_pos);
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*(buf + byte_pos) ^= (1 << bit_pos);
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pos = sector_num * host->pmecc_sector_size + byte_pos;
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printk(KERN_INFO "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
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pos, bit_pos, err_byte, *(buf + byte_pos));
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} else {
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/* Bit flip in OOB area */
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tmp = sector_num * host->pmecc_bytes_per_sector
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+ (byte_pos - sector_size);
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err_byte = ecc[tmp];
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ecc[tmp] ^= (1 << bit_pos);
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pos = tmp + nand_chip->ecc.layout->eccpos[0];
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printk(KERN_INFO "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
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pos, bit_pos, err_byte, ecc[tmp]);
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}
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i++;
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err_nbr--;
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}
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return;
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}
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static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
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u8 *ecc)
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{
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struct nand_chip *nand_chip = mtd->priv;
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struct atmel_nand_host *host = nand_chip->priv;
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int i, err_nbr, eccbytes;
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uint8_t *buf_pos;
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eccbytes = nand_chip->ecc.bytes;
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for (i = 0; i < eccbytes; i++)
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if (ecc[i] != 0xff)
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|
goto normal_check;
|
|
/* Erased page, return OK */
|
|
return 0;
|
|
|
|
normal_check:
|
|
for (i = 0; i < host->pmecc_sector_number; i++) {
|
|
err_nbr = 0;
|
|
if (pmecc_stat & 0x1) {
|
|
buf_pos = buf + i * host->pmecc_sector_size;
|
|
|
|
pmecc_gen_syndrome(mtd, i);
|
|
pmecc_substitute(mtd);
|
|
pmecc_get_sigma(mtd);
|
|
|
|
err_nbr = pmecc_err_location(mtd);
|
|
if (err_nbr == -1) {
|
|
printk(KERN_ERR "PMECC: Too many errors\n");
|
|
mtd->ecc_stats.failed++;
|
|
return -EIO;
|
|
} else {
|
|
pmecc_correct_data(mtd, buf_pos, ecc, i,
|
|
host->pmecc_bytes_per_sector, err_nbr);
|
|
mtd->ecc_stats.corrected += err_nbr;
|
|
}
|
|
}
|
|
pmecc_stat >>= 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
|
|
struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
|
|
{
|
|
struct atmel_nand_host *host = chip->priv;
|
|
int eccsize = chip->ecc.size;
|
|
uint8_t *oob = chip->oob_poi;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
uint32_t stat;
|
|
int timeout = PMECC_MAX_TIMEOUT_US;
|
|
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
|
|
pmecc_writel(host->pmecc, cfg, ((pmecc_readl(host->pmecc, cfg))
|
|
& ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE);
|
|
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA);
|
|
|
|
chip->read_buf(mtd, buf, eccsize);
|
|
chip->read_buf(mtd, oob, mtd->oobsize);
|
|
|
|
while (--timeout) {
|
|
if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY))
|
|
break;
|
|
WATCHDOG_RESET();
|
|
udelay(1);
|
|
}
|
|
|
|
if (!timeout) {
|
|
printk(KERN_ERR "atmel_nand : Timeout to read PMECC page\n");
|
|
return -1;
|
|
}
|
|
|
|
stat = pmecc_readl(host->pmecc, isr);
|
|
if (stat != 0)
|
|
if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
|
|
struct nand_chip *chip, const uint8_t *buf,
|
|
int oob_required)
|
|
{
|
|
struct atmel_nand_host *host = chip->priv;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
int i, j;
|
|
int timeout = PMECC_MAX_TIMEOUT_US;
|
|
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
|
|
|
|
pmecc_writel(host->pmecc, cfg, (pmecc_readl(host->pmecc, cfg) |
|
|
PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE);
|
|
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA);
|
|
|
|
chip->write_buf(mtd, (u8 *)buf, mtd->writesize);
|
|
|
|
while (--timeout) {
|
|
if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY))
|
|
break;
|
|
WATCHDOG_RESET();
|
|
udelay(1);
|
|
}
|
|
|
|
if (!timeout) {
|
|
printk(KERN_ERR "atmel_nand : Timeout to read PMECC status, fail to write PMECC in oob\n");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < host->pmecc_sector_number; i++) {
|
|
for (j = 0; j < host->pmecc_bytes_per_sector; j++) {
|
|
int pos;
|
|
|
|
pos = i * host->pmecc_bytes_per_sector + j;
|
|
chip->oob_poi[eccpos[pos]] =
|
|
readb(&host->pmecc->ecc_port[i].ecc[j]);
|
|
}
|
|
}
|
|
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static void atmel_pmecc_core_init(struct mtd_info *mtd)
|
|
{
|
|
struct nand_chip *nand_chip = mtd->priv;
|
|
struct atmel_nand_host *host = nand_chip->priv;
|
|
uint32_t val = 0;
|
|
struct nand_ecclayout *ecc_layout;
|
|
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
|
|
|
|
switch (host->pmecc_corr_cap) {
|
|
case 2:
|
|
val = PMECC_CFG_BCH_ERR2;
|
|
break;
|
|
case 4:
|
|
val = PMECC_CFG_BCH_ERR4;
|
|
break;
|
|
case 8:
|
|
val = PMECC_CFG_BCH_ERR8;
|
|
break;
|
|
case 12:
|
|
val = PMECC_CFG_BCH_ERR12;
|
|
break;
|
|
case 24:
|
|
val = PMECC_CFG_BCH_ERR24;
|
|
break;
|
|
}
|
|
|
|
if (host->pmecc_sector_size == 512)
|
|
val |= PMECC_CFG_SECTOR512;
|
|
else if (host->pmecc_sector_size == 1024)
|
|
val |= PMECC_CFG_SECTOR1024;
|
|
|
|
switch (host->pmecc_sector_number) {
|
|
case 1:
|
|
val |= PMECC_CFG_PAGE_1SECTOR;
|
|
break;
|
|
case 2:
|
|
val |= PMECC_CFG_PAGE_2SECTORS;
|
|
break;
|
|
case 4:
|
|
val |= PMECC_CFG_PAGE_4SECTORS;
|
|
break;
|
|
case 8:
|
|
val |= PMECC_CFG_PAGE_8SECTORS;
|
|
break;
|
|
}
|
|
|
|
val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE
|
|
| PMECC_CFG_AUTO_DISABLE);
|
|
pmecc_writel(host->pmecc, cfg, val);
|
|
|
|
ecc_layout = nand_chip->ecc.layout;
|
|
pmecc_writel(host->pmecc, sarea, mtd->oobsize - 1);
|
|
pmecc_writel(host->pmecc, saddr, ecc_layout->eccpos[0]);
|
|
pmecc_writel(host->pmecc, eaddr,
|
|
ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
|
|
/* See datasheet about PMECC Clock Control Register */
|
|
pmecc_writel(host->pmecc, clk, PMECC_CLK_133MHZ);
|
|
pmecc_writel(host->pmecc, idr, 0xff);
|
|
pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
|
|
}
|
|
|
|
static int atmel_pmecc_nand_init_params(struct nand_chip *nand,
|
|
struct mtd_info *mtd)
|
|
{
|
|
struct atmel_nand_host *host;
|
|
int cap, sector_size;
|
|
|
|
host = nand->priv = &pmecc_host;
|
|
|
|
nand->ecc.mode = NAND_ECC_HW;
|
|
nand->ecc.calculate = NULL;
|
|
nand->ecc.correct = NULL;
|
|
nand->ecc.hwctl = NULL;
|
|
|
|
cap = host->pmecc_corr_cap = CONFIG_PMECC_CAP;
|
|
sector_size = host->pmecc_sector_size = CONFIG_PMECC_SECTOR_SIZE;
|
|
host->pmecc_index_table_offset = CONFIG_PMECC_INDEX_TABLE_OFFSET;
|
|
|
|
MTDDEBUG(MTD_DEBUG_LEVEL1,
|
|
"Initialize PMECC params, cap: %d, sector: %d\n",
|
|
cap, sector_size);
|
|
|
|
host->pmecc = (struct pmecc_regs __iomem *) ATMEL_BASE_PMECC;
|
|
host->pmerrloc = (struct pmecc_errloc_regs __iomem *)
|
|
ATMEL_BASE_PMERRLOC;
|
|
host->pmecc_rom_base = (void __iomem *) ATMEL_BASE_ROM;
|
|
|
|
/* ECC is calculated for the whole page (1 step) */
|
|
nand->ecc.size = mtd->writesize;
|
|
|
|
/* set ECC page size and oob layout */
|
|
switch (mtd->writesize) {
|
|
case 2048:
|
|
case 4096:
|
|
host->pmecc_degree = PMECC_GF_DIMENSION_13;
|
|
host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
|
|
host->pmecc_sector_number = mtd->writesize / sector_size;
|
|
host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes(
|
|
cap, sector_size);
|
|
host->pmecc_alpha_to = pmecc_get_alpha_to(host);
|
|
host->pmecc_index_of = host->pmecc_rom_base +
|
|
host->pmecc_index_table_offset;
|
|
|
|
nand->ecc.steps = 1;
|
|
nand->ecc.bytes = host->pmecc_bytes_per_sector *
|
|
host->pmecc_sector_number;
|
|
if (nand->ecc.bytes > mtd->oobsize - 2) {
|
|
printk(KERN_ERR "No room for ECC bytes\n");
|
|
return -EINVAL;
|
|
}
|
|
pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
|
|
mtd->oobsize,
|
|
nand->ecc.bytes);
|
|
nand->ecc.layout = &atmel_pmecc_oobinfo;
|
|
break;
|
|
case 512:
|
|
case 1024:
|
|
/* TODO */
|
|
printk(KERN_ERR "Unsupported page size for PMECC, use Software ECC\n");
|
|
default:
|
|
/* page size not handled by HW ECC */
|
|
/* switching back to soft ECC */
|
|
nand->ecc.mode = NAND_ECC_SOFT;
|
|
nand->ecc.read_page = NULL;
|
|
nand->ecc.postpad = 0;
|
|
nand->ecc.prepad = 0;
|
|
nand->ecc.bytes = 0;
|
|
return 0;
|
|
}
|
|
|
|
nand->ecc.read_page = atmel_nand_pmecc_read_page;
|
|
nand->ecc.write_page = atmel_nand_pmecc_write_page;
|
|
nand->ecc.strength = cap;
|
|
|
|
atmel_pmecc_core_init(mtd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
/* oob layout for large page size
|
|
* bad block info is on bytes 0 and 1
|
|
* the bytes have to be consecutives to avoid
|
|
* several NAND_CMD_RNDOUT during read
|
|
*/
|
|
static struct nand_ecclayout atmel_oobinfo_large = {
|
|
.eccbytes = 4,
|
|
.eccpos = {60, 61, 62, 63},
|
|
.oobfree = {
|
|
{2, 58}
|
|
},
|
|
};
|
|
|
|
/* oob layout for small page size
|
|
* bad block info is on bytes 4 and 5
|
|
* the bytes have to be consecutives to avoid
|
|
* several NAND_CMD_RNDOUT during read
|
|
*/
|
|
static struct nand_ecclayout atmel_oobinfo_small = {
|
|
.eccbytes = 4,
|
|
.eccpos = {0, 1, 2, 3},
|
|
.oobfree = {
|
|
{6, 10}
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Calculate HW ECC
|
|
*
|
|
* function called after a write
|
|
*
|
|
* mtd: MTD block structure
|
|
* dat: raw data (unused)
|
|
* ecc_code: buffer for ECC
|
|
*/
|
|
static int atmel_nand_calculate(struct mtd_info *mtd,
|
|
const u_char *dat, unsigned char *ecc_code)
|
|
{
|
|
unsigned int ecc_value;
|
|
|
|
/* get the first 2 ECC bytes */
|
|
ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR);
|
|
|
|
ecc_code[0] = ecc_value & 0xFF;
|
|
ecc_code[1] = (ecc_value >> 8) & 0xFF;
|
|
|
|
/* get the last 2 ECC bytes */
|
|
ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, NPR) & ATMEL_ECC_NPARITY;
|
|
|
|
ecc_code[2] = ecc_value & 0xFF;
|
|
ecc_code[3] = (ecc_value >> 8) & 0xFF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* HW ECC read page function
|
|
*
|
|
* mtd: mtd info structure
|
|
* chip: nand chip info structure
|
|
* buf: buffer to store read data
|
|
* oob_required: caller expects OOB data read to chip->oob_poi
|
|
*/
|
|
static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
|
|
uint8_t *buf, int oob_required, int page)
|
|
{
|
|
int eccsize = chip->ecc.size;
|
|
int eccbytes = chip->ecc.bytes;
|
|
uint32_t *eccpos = chip->ecc.layout->eccpos;
|
|
uint8_t *p = buf;
|
|
uint8_t *oob = chip->oob_poi;
|
|
uint8_t *ecc_pos;
|
|
int stat;
|
|
|
|
/* read the page */
|
|
chip->read_buf(mtd, p, eccsize);
|
|
|
|
/* move to ECC position if needed */
|
|
if (eccpos[0] != 0) {
|
|
/* This only works on large pages
|
|
* because the ECC controller waits for
|
|
* NAND_CMD_RNDOUTSTART after the
|
|
* NAND_CMD_RNDOUT.
|
|
* anyway, for small pages, the eccpos[0] == 0
|
|
*/
|
|
chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
|
|
mtd->writesize + eccpos[0], -1);
|
|
}
|
|
|
|
/* the ECC controller needs to read the ECC just after the data */
|
|
ecc_pos = oob + eccpos[0];
|
|
chip->read_buf(mtd, ecc_pos, eccbytes);
|
|
|
|
/* check if there's an error */
|
|
stat = chip->ecc.correct(mtd, p, oob, NULL);
|
|
|
|
if (stat < 0)
|
|
mtd->ecc_stats.failed++;
|
|
else
|
|
mtd->ecc_stats.corrected += stat;
|
|
|
|
/* get back to oob start (end of page) */
|
|
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
|
|
|
|
/* read the oob */
|
|
chip->read_buf(mtd, oob, mtd->oobsize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* HW ECC Correction
|
|
*
|
|
* function called after a read
|
|
*
|
|
* mtd: MTD block structure
|
|
* dat: raw data read from the chip
|
|
* read_ecc: ECC from the chip (unused)
|
|
* isnull: unused
|
|
*
|
|
* Detect and correct a 1 bit error for a page
|
|
*/
|
|
static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat,
|
|
u_char *read_ecc, u_char *isnull)
|
|
{
|
|
struct nand_chip *nand_chip = mtd->priv;
|
|
unsigned int ecc_status;
|
|
unsigned int ecc_word, ecc_bit;
|
|
|
|
/* get the status from the Status Register */
|
|
ecc_status = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, SR);
|
|
|
|
/* if there's no error */
|
|
if (likely(!(ecc_status & ATMEL_ECC_RECERR)))
|
|
return 0;
|
|
|
|
/* get error bit offset (4 bits) */
|
|
ecc_bit = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_BITADDR;
|
|
/* get word address (12 bits) */
|
|
ecc_word = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_WORDADDR;
|
|
ecc_word >>= 4;
|
|
|
|
/* if there are multiple errors */
|
|
if (ecc_status & ATMEL_ECC_MULERR) {
|
|
/* check if it is a freshly erased block
|
|
* (filled with 0xff) */
|
|
if ((ecc_bit == ATMEL_ECC_BITADDR)
|
|
&& (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) {
|
|
/* the block has just been erased, return OK */
|
|
return 0;
|
|
}
|
|
/* it doesn't seems to be a freshly
|
|
* erased block.
|
|
* We can't correct so many errors */
|
|
printk(KERN_WARNING "atmel_nand : multiple errors detected."
|
|
" Unable to correct.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* if there's a single bit error : we can correct it */
|
|
if (ecc_status & ATMEL_ECC_ECCERR) {
|
|
/* there's nothing much to do here.
|
|
* the bit error is on the ECC itself.
|
|
*/
|
|
printk(KERN_WARNING "atmel_nand : one bit error on ECC code."
|
|
" Nothing to correct\n");
|
|
return 0;
|
|
}
|
|
|
|
printk(KERN_WARNING "atmel_nand : one bit error on data."
|
|
" (word offset in the page :"
|
|
" 0x%x bit offset : 0x%x)\n",
|
|
ecc_word, ecc_bit);
|
|
/* correct the error */
|
|
if (nand_chip->options & NAND_BUSWIDTH_16) {
|
|
/* 16 bits words */
|
|
((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
|
|
} else {
|
|
/* 8 bits words */
|
|
dat[ecc_word] ^= (1 << ecc_bit);
|
|
}
|
|
printk(KERN_WARNING "atmel_nand : error corrected\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Enable HW ECC : unused on most chips
|
|
*/
|
|
static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
|
|
{
|
|
}
|
|
|
|
int atmel_hwecc_nand_init_param(struct nand_chip *nand, struct mtd_info *mtd)
|
|
{
|
|
nand->ecc.mode = NAND_ECC_HW;
|
|
nand->ecc.calculate = atmel_nand_calculate;
|
|
nand->ecc.correct = atmel_nand_correct;
|
|
nand->ecc.hwctl = atmel_nand_hwctl;
|
|
nand->ecc.read_page = atmel_nand_read_page;
|
|
nand->ecc.bytes = 4;
|
|
|
|
if (nand->ecc.mode == NAND_ECC_HW) {
|
|
/* ECC is calculated for the whole page (1 step) */
|
|
nand->ecc.size = mtd->writesize;
|
|
|
|
/* set ECC page size and oob layout */
|
|
switch (mtd->writesize) {
|
|
case 512:
|
|
nand->ecc.layout = &atmel_oobinfo_small;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
|
|
ATMEL_ECC_PAGESIZE_528);
|
|
break;
|
|
case 1024:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
|
|
ATMEL_ECC_PAGESIZE_1056);
|
|
break;
|
|
case 2048:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
|
|
ATMEL_ECC_PAGESIZE_2112);
|
|
break;
|
|
case 4096:
|
|
nand->ecc.layout = &atmel_oobinfo_large;
|
|
ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
|
|
ATMEL_ECC_PAGESIZE_4224);
|
|
break;
|
|
default:
|
|
/* page size not handled by HW ECC */
|
|
/* switching back to soft ECC */
|
|
nand->ecc.mode = NAND_ECC_SOFT;
|
|
nand->ecc.calculate = NULL;
|
|
nand->ecc.correct = NULL;
|
|
nand->ecc.hwctl = NULL;
|
|
nand->ecc.read_page = NULL;
|
|
nand->ecc.postpad = 0;
|
|
nand->ecc.prepad = 0;
|
|
nand->ecc.bytes = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_ATMEL_NAND_HW_PMECC */
|
|
|
|
#endif /* CONFIG_ATMEL_NAND_HWECC */
|
|
|
|
static void at91_nand_hwcontrol(struct mtd_info *mtd,
|
|
int cmd, unsigned int ctrl)
|
|
{
|
|
struct nand_chip *this = mtd->priv;
|
|
|
|
if (ctrl & NAND_CTRL_CHANGE) {
|
|
ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
|
|
IO_ADDR_W &= ~(CONFIG_SYS_NAND_MASK_ALE
|
|
| CONFIG_SYS_NAND_MASK_CLE);
|
|
|
|
if (ctrl & NAND_CLE)
|
|
IO_ADDR_W |= CONFIG_SYS_NAND_MASK_CLE;
|
|
if (ctrl & NAND_ALE)
|
|
IO_ADDR_W |= CONFIG_SYS_NAND_MASK_ALE;
|
|
|
|
#ifdef CONFIG_SYS_NAND_ENABLE_PIN
|
|
at91_set_gpio_value(CONFIG_SYS_NAND_ENABLE_PIN,
|
|
!(ctrl & NAND_NCE));
|
|
#endif
|
|
this->IO_ADDR_W = (void *) IO_ADDR_W;
|
|
}
|
|
|
|
if (cmd != NAND_CMD_NONE)
|
|
writeb(cmd, this->IO_ADDR_W);
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_NAND_READY_PIN
|
|
static int at91_nand_ready(struct mtd_info *mtd)
|
|
{
|
|
return at91_get_gpio_value(CONFIG_SYS_NAND_READY_PIN);
|
|
}
|
|
#endif
|
|
|
|
#ifndef CONFIG_SYS_NAND_BASE_LIST
|
|
#define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
|
|
#endif
|
|
static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
|
|
static ulong base_addr[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
|
|
|
|
int atmel_nand_chip_init(int devnum, ulong base_addr)
|
|
{
|
|
int ret;
|
|
struct mtd_info *mtd = &nand_info[devnum];
|
|
struct nand_chip *nand = &nand_chip[devnum];
|
|
|
|
mtd->priv = nand;
|
|
nand->IO_ADDR_R = nand->IO_ADDR_W = (void __iomem *)base_addr;
|
|
|
|
nand->ecc.mode = NAND_ECC_SOFT;
|
|
#ifdef CONFIG_SYS_NAND_DBW_16
|
|
nand->options = NAND_BUSWIDTH_16;
|
|
#endif
|
|
nand->cmd_ctrl = at91_nand_hwcontrol;
|
|
#ifdef CONFIG_SYS_NAND_READY_PIN
|
|
nand->dev_ready = at91_nand_ready;
|
|
#endif
|
|
nand->chip_delay = 20;
|
|
|
|
ret = nand_scan_ident(mtd, CONFIG_SYS_NAND_MAX_CHIPS, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
#ifdef CONFIG_ATMEL_NAND_HWECC
|
|
#ifdef CONFIG_ATMEL_NAND_HW_PMECC
|
|
ret = atmel_pmecc_nand_init_params(nand, mtd);
|
|
#else
|
|
ret = atmel_hwecc_nand_init_param(nand, mtd);
|
|
#endif
|
|
if (ret)
|
|
return ret;
|
|
#endif
|
|
|
|
ret = nand_scan_tail(mtd);
|
|
if (!ret)
|
|
nand_register(devnum);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void board_nand_init(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
|
|
if (atmel_nand_chip_init(i, base_addr[i]))
|
|
printk(KERN_ERR "atmel_nand: Fail to initialize #%d chip",
|
|
i);
|
|
}
|