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nand: atmel: Add pmecc driver
Add driver for atmel pmecc. This implementation is ported from Linux. The reference taken is linux-5.4-at91. Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@microchip.com>
This commit is contained in:
Balamanikandan Gunasundar
committed by
Eugen Hristev
Eugen Hristev
parent
6a8dfd5722
commit
a490e1b7c0
@@ -1,4 +1,5 @@
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# SPDX-License-Identifier: GPL-2.0-only
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obj-$(CONFIG_DM_NAND_ATMEL) += atmel-nand-controller.o
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obj-$(CONFIG_DM_NAND_ATMEL) += atmel-nand-controller.o atmel-pmecc.o
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atmel-nand-controller-objs := nand-controller.o
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atmel-pmecc-objs := pmecc.o
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965
drivers/mtd/nand/raw/atmel/pmecc.c
Normal file
965
drivers/mtd/nand/raw/atmel/pmecc.c
Normal file
@@ -0,0 +1,965 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2017 ATMEL
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* Copyright 2017 Free Electrons
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*
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* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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*
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* Derived from the atmel_nand.c driver which contained the following
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* copyrights:
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*
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* Copyright 2003 Rick Bronson
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*
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* Derived from drivers/mtd/nand/autcpu12.c (removed in v3.8)
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* Copyright 2001 Thomas Gleixner (gleixner@autronix.de)
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*
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* Derived from drivers/mtd/spia.c (removed in v3.8)
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* Copyright 2000 Steven J. Hill (sjhill@cotw.com)
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*
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* Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
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* Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright 2007
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*
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* Derived from Das U-Boot source code
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* (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
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* 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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* Copyright 2012 ATMEL, Hong Xu
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*
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* Add Nand Flash Controller support for SAMA5 SoC
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* Copyright 2013 ATMEL, Josh Wu (josh.wu@atmel.com)
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*
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* The PMECC is an hardware assisted BCH engine, which means part of the
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* ECC algorithm is left to the software. The hardware/software repartition
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* is explained in the "PMECC Controller Functional Description" chapter in
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* Atmel datasheets, and some of the functions in this file are directly
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* implementing the algorithms described in the "Software Implementation"
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* sub-section.
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*
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* TODO: it seems that the software BCH implementation in lib/bch.c is already
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* providing some of the logic we are implementing here. It would be smart
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* to expose the needed lib/bch.c helpers/functions and re-use them here.
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*/
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#include <linux/iopoll.h>
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#include <linux/mtd/rawnand.h>
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#include <dm/of_access.h>
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#include <dm/ofnode.h>
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#include <asm/io.h>
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#include "pmecc.h"
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#include <dm/uclass.h>
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#include <dm/device_compat.h>
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#include <dm/devres.h>
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#include <linux/ioport.h>
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/* Galois field dimension */
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#define PMECC_GF_DIMENSION_13 13
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#define PMECC_GF_DIMENSION_14 14
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/* Primitive Polynomial used by PMECC */
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#define PMECC_GF_13_PRIMITIVE_POLY 0x201b
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#define PMECC_GF_14_PRIMITIVE_POLY 0x4443
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#define PMECC_LOOKUP_TABLE_SIZE_512 0x2000
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#define PMECC_LOOKUP_TABLE_SIZE_1024 0x4000
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/* Time out value for reading PMECC status register */
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#define PMECC_MAX_TIMEOUT_MS 100
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/* PMECC Register Definitions */
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#define ATMEL_PMECC_CFG 0x0
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#define PMECC_CFG_BCH_STRENGTH(x) (x)
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#define PMECC_CFG_BCH_STRENGTH_MASK GENMASK(2, 0)
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#define PMECC_CFG_SECTOR512 (0 << 4)
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#define PMECC_CFG_SECTOR1024 BIT(4)
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#define PMECC_CFG_NSECTORS(x) ((fls(x) - 1) << 8)
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#define PMECC_CFG_READ_OP (0 << 12)
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#define PMECC_CFG_WRITE_OP BIT(12)
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#define PMECC_CFG_SPARE_ENABLE BIT(16)
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#define PMECC_CFG_AUTO_ENABLE BIT(20)
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#define ATMEL_PMECC_SAREA 0x4
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#define ATMEL_PMECC_SADDR 0x8
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#define ATMEL_PMECC_EADDR 0xc
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#define ATMEL_PMECC_CLK 0x10
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#define PMECC_CLK_133MHZ (2 << 0)
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#define ATMEL_PMECC_CTRL 0x14
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#define PMECC_CTRL_RST BIT(0)
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#define PMECC_CTRL_DATA BIT(1)
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#define PMECC_CTRL_USER BIT(2)
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#define PMECC_CTRL_ENABLE BIT(4)
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#define PMECC_CTRL_DISABLE BIT(5)
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#define ATMEL_PMECC_SR 0x18
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#define PMECC_SR_BUSY BIT(0)
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#define PMECC_SR_ENABLE BIT(4)
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#define ATMEL_PMECC_IER 0x1c
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#define ATMEL_PMECC_IDR 0x20
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#define ATMEL_PMECC_IMR 0x24
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#define ATMEL_PMECC_ISR 0x28
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#define PMECC_ERROR_INT BIT(0)
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#define ATMEL_PMECC_ECC(sector, n) \
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((((sector) + 1) * 0x40) + (n))
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#define ATMEL_PMECC_REM(sector, n) \
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((((sector) + 1) * 0x40) + ((n) * 4) + 0x200)
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/* PMERRLOC Register Definitions */
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#define ATMEL_PMERRLOC_ELCFG 0x0
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#define PMERRLOC_ELCFG_SECTOR_512 (0 << 0)
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#define PMERRLOC_ELCFG_SECTOR_1024 BIT(0)
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#define PMERRLOC_ELCFG_NUM_ERRORS(n) ((n) << 16)
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#define ATMEL_PMERRLOC_ELPRIM 0x4
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#define ATMEL_PMERRLOC_ELEN 0x8
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#define ATMEL_PMERRLOC_ELDIS 0xc
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#define PMERRLOC_DISABLE BIT(0)
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#define ATMEL_PMERRLOC_ELSR 0x10
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#define PMERRLOC_ELSR_BUSY BIT(0)
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#define ATMEL_PMERRLOC_ELIER 0x14
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#define ATMEL_PMERRLOC_ELIDR 0x18
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#define ATMEL_PMERRLOC_ELIMR 0x1c
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#define ATMEL_PMERRLOC_ELISR 0x20
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#define PMERRLOC_ERR_NUM_MASK GENMASK(12, 8)
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#define PMERRLOC_CALC_DONE BIT(0)
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#define ATMEL_PMERRLOC_SIGMA(x) (((x) * 0x4) + 0x28)
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#define ATMEL_PMERRLOC_EL(offs, x) (((x) * 0x4) + (offs))
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struct atmel_pmecc_gf_tables {
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u16 *alpha_to;
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u16 *index_of;
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};
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struct atmel_pmecc_caps {
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const int *strengths;
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int nstrengths;
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int el_offset;
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bool correct_erased_chunks;
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};
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struct atmel_pmecc_user_conf_cache {
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u32 cfg;
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u32 sarea;
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u32 saddr;
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u32 eaddr;
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};
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struct atmel_pmecc_user {
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struct atmel_pmecc_user_conf_cache cache;
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struct atmel_pmecc *pmecc;
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const struct atmel_pmecc_gf_tables *gf_tables;
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int eccbytes;
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s16 *partial_syn;
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s16 *si;
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s16 *lmu;
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s16 *smu;
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s32 *mu;
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s32 *dmu;
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s32 *delta;
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u32 isr;
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};
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/* Serialize table access */
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DEFINE_MUTEX(pmecc_gf_tables_lock);
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static const struct atmel_pmecc_gf_tables *pmecc_gf_tables_512;
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static const struct atmel_pmecc_gf_tables *pmecc_gf_tables_1024;
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static inline int deg(unsigned int poly)
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{
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/* polynomial degree is the most-significant bit index */
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return fls(poly) - 1;
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}
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static int atmel_pmecc_build_gf_tables(int mm, unsigned int poly,
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struct atmel_pmecc_gf_tables *gf_tables)
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{
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unsigned int i, x = 1;
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const unsigned int k = BIT(deg(poly));
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unsigned int nn = BIT(mm) - 1;
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/* primitive polynomial must be of degree m */
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if (k != (1u << mm))
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return -EINVAL;
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for (i = 0; i < nn; i++) {
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gf_tables->alpha_to[i] = x;
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gf_tables->index_of[x] = i;
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if (i && (x == 1))
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/* polynomial is not primitive (a^i=1 with 0<i<2^m-1) */
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return -EINVAL;
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x <<= 1;
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if (x & k)
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x ^= poly;
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}
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gf_tables->alpha_to[nn] = 1;
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gf_tables->index_of[0] = 0;
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return 0;
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}
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static const struct atmel_pmecc_gf_tables *
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atmel_pmecc_create_gf_tables(const struct atmel_pmecc_user_req *req)
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{
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struct atmel_pmecc_gf_tables *gf_tables;
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unsigned int poly, degree, table_size;
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int ret;
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if (req->ecc.sectorsize == 512) {
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degree = PMECC_GF_DIMENSION_13;
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poly = PMECC_GF_13_PRIMITIVE_POLY;
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table_size = PMECC_LOOKUP_TABLE_SIZE_512;
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} else {
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degree = PMECC_GF_DIMENSION_14;
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poly = PMECC_GF_14_PRIMITIVE_POLY;
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table_size = PMECC_LOOKUP_TABLE_SIZE_1024;
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}
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gf_tables = kzalloc(sizeof(*gf_tables) +
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(2 * table_size * sizeof(u16)),
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GFP_KERNEL);
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if (!gf_tables)
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return ERR_PTR(-ENOMEM);
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gf_tables->alpha_to = (void *)(gf_tables + 1);
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gf_tables->index_of = gf_tables->alpha_to + table_size;
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ret = atmel_pmecc_build_gf_tables(degree, poly, gf_tables);
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if (ret) {
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kfree(gf_tables);
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return ERR_PTR(ret);
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}
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return gf_tables;
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}
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static const struct atmel_pmecc_gf_tables *
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atmel_pmecc_get_gf_tables(const struct atmel_pmecc_user_req *req)
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{
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const struct atmel_pmecc_gf_tables **gf_tables, *ret;
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mutex_lock(&pmecc_gf_tables_lock);
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if (req->ecc.sectorsize == 512)
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gf_tables = &pmecc_gf_tables_512;
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else
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gf_tables = &pmecc_gf_tables_1024;
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ret = *gf_tables;
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if (!ret) {
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ret = atmel_pmecc_create_gf_tables(req);
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if (!IS_ERR(ret))
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*gf_tables = ret;
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}
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mutex_unlock(&pmecc_gf_tables_lock);
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return ret;
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}
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static int atmel_pmecc_prepare_user_req(struct atmel_pmecc *pmecc,
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struct atmel_pmecc_user_req *req)
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{
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int i, max_eccbytes, eccbytes = 0, eccstrength = 0;
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if (req->pagesize <= 0 || req->oobsize <= 0 || req->ecc.bytes <= 0)
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return -EINVAL;
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if (req->ecc.ooboffset >= 0 &&
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req->ecc.ooboffset + req->ecc.bytes > req->oobsize)
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return -EINVAL;
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if (req->ecc.sectorsize == ATMEL_PMECC_SECTOR_SIZE_AUTO) {
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if (req->ecc.strength != ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH)
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return -EINVAL;
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if (req->pagesize > 512)
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req->ecc.sectorsize = 1024;
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else
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req->ecc.sectorsize = 512;
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}
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if (req->ecc.sectorsize != 512 && req->ecc.sectorsize != 1024)
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return -EINVAL;
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if (req->pagesize % req->ecc.sectorsize)
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return -EINVAL;
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req->ecc.nsectors = req->pagesize / req->ecc.sectorsize;
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max_eccbytes = req->ecc.bytes;
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for (i = 0; i < pmecc->caps->nstrengths; i++) {
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int nbytes, strength = pmecc->caps->strengths[i];
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if (req->ecc.strength != ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH &&
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strength < req->ecc.strength)
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continue;
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nbytes = DIV_ROUND_UP(strength * fls(8 * req->ecc.sectorsize),
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8);
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nbytes *= req->ecc.nsectors;
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if (nbytes > max_eccbytes)
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break;
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eccstrength = strength;
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eccbytes = nbytes;
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if (req->ecc.strength != ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH)
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break;
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}
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if (!eccstrength)
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return -EINVAL;
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req->ecc.bytes = eccbytes;
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req->ecc.strength = eccstrength;
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if (req->ecc.ooboffset < 0)
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req->ecc.ooboffset = req->oobsize - eccbytes;
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return 0;
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}
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struct atmel_pmecc_user *
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atmel_pmecc_create_user(struct atmel_pmecc *pmecc,
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struct atmel_pmecc_user_req *req)
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{
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struct atmel_pmecc_user *user;
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const struct atmel_pmecc_gf_tables *gf_tables;
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int strength, size, ret;
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ret = atmel_pmecc_prepare_user_req(pmecc, req);
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if (ret)
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return ERR_PTR(ret);
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size = sizeof(*user);
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size = ALIGN(size, sizeof(u16));
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/* Reserve space for partial_syn, si and smu */
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size += ((2 * req->ecc.strength) + 1) * sizeof(u16) *
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(2 + req->ecc.strength + 2);
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/* Reserve space for lmu. */
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size += (req->ecc.strength + 1) * sizeof(u16);
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/* Reserve space for mu, dmu and delta. */
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size = ALIGN(size, sizeof(s32));
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size += (req->ecc.strength + 1) * sizeof(s32) * 3;
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user = kzalloc(size, GFP_KERNEL);
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if (!user)
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return ERR_PTR(-ENOMEM);
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user->pmecc = pmecc;
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user->partial_syn = (s16 *)PTR_ALIGN(user + 1, sizeof(u16));
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user->si = user->partial_syn + ((2 * req->ecc.strength) + 1);
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user->lmu = user->si + ((2 * req->ecc.strength) + 1);
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user->smu = user->lmu + (req->ecc.strength + 1);
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user->mu = (s32 *)PTR_ALIGN(user->smu +
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(((2 * req->ecc.strength) + 1) *
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(req->ecc.strength + 2)),
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sizeof(s32));
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user->dmu = user->mu + req->ecc.strength + 1;
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user->delta = user->dmu + req->ecc.strength + 1;
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gf_tables = atmel_pmecc_get_gf_tables(req);
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if (IS_ERR(gf_tables)) {
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kfree(user);
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return ERR_CAST(gf_tables);
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}
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user->gf_tables = gf_tables;
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user->eccbytes = req->ecc.bytes / req->ecc.nsectors;
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for (strength = 0; strength < pmecc->caps->nstrengths; strength++) {
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if (pmecc->caps->strengths[strength] == req->ecc.strength)
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break;
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}
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user->cache.cfg = PMECC_CFG_BCH_STRENGTH(strength) |
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PMECC_CFG_NSECTORS(req->ecc.nsectors);
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if (req->ecc.sectorsize == 1024)
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user->cache.cfg |= PMECC_CFG_SECTOR1024;
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user->cache.sarea = req->oobsize - 1;
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user->cache.saddr = req->ecc.ooboffset;
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user->cache.eaddr = req->ecc.ooboffset + req->ecc.bytes - 1;
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return user;
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}
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EXPORT_SYMBOL_GPL(atmel_pmecc_create_user);
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void atmel_pmecc_destroy_user(struct atmel_pmecc_user *user)
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{
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kfree(user);
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}
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EXPORT_SYMBOL_GPL(atmel_pmecc_destroy_user);
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static int get_strength(struct atmel_pmecc_user *user)
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{
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const int *strengths = user->pmecc->caps->strengths;
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return strengths[user->cache.cfg & PMECC_CFG_BCH_STRENGTH_MASK];
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}
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static int get_sectorsize(struct atmel_pmecc_user *user)
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{
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return user->cache.cfg & PMECC_CFG_SECTOR1024 ? 1024 : 512;
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}
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static void atmel_pmecc_gen_syndrome(struct atmel_pmecc_user *user, int sector)
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{
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int strength = get_strength(user);
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u32 value;
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int i;
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/* Fill odd syndromes */
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for (i = 0; i < strength; i++) {
|
||||
value = readl_relaxed(user->pmecc->regs.base +
|
||||
ATMEL_PMECC_REM(sector, i / 2));
|
||||
if (i & 1)
|
||||
value >>= 16;
|
||||
|
||||
user->partial_syn[(2 * i) + 1] = value;
|
||||
}
|
||||
}
|
||||
|
||||
static void atmel_pmecc_substitute(struct atmel_pmecc_user *user)
|
||||
{
|
||||
int degree = get_sectorsize(user) == 512 ? 13 : 14;
|
||||
int cw_len = BIT(degree) - 1;
|
||||
int strength = get_strength(user);
|
||||
s16 *alpha_to = (s16 *)user->gf_tables->alpha_to;
|
||||
s16 *index_of = (s16 *)user->gf_tables->index_of;
|
||||
s16 *partial_syn = user->partial_syn;
|
||||
s16 *si;
|
||||
int i, j;
|
||||
|
||||
/*
|
||||
* si[] is a table that holds the current syndrome value,
|
||||
* an element of that table belongs to the field
|
||||
*/
|
||||
si = user->si;
|
||||
|
||||
memset(&si[1], 0, sizeof(s16) * ((2 * strength) - 1));
|
||||
|
||||
/* Computation 2t syndromes based on S(x) */
|
||||
/* Odd syndromes */
|
||||
for (i = 1; i < 2 * strength; i += 2) {
|
||||
for (j = 0; j < degree; j++) {
|
||||
if (partial_syn[i] & BIT(j))
|
||||
si[i] = alpha_to[i * j] ^ si[i];
|
||||
}
|
||||
}
|
||||
/* Even syndrome = (Odd syndrome) ** 2 */
|
||||
for (i = 2, j = 1; j <= strength; i = ++j << 1) {
|
||||
if (si[j] == 0) {
|
||||
si[i] = 0;
|
||||
} else {
|
||||
s16 tmp;
|
||||
|
||||
tmp = index_of[si[j]];
|
||||
tmp = (tmp * 2) % cw_len;
|
||||
si[i] = alpha_to[tmp];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void atmel_pmecc_get_sigma(struct atmel_pmecc_user *user)
|
||||
{
|
||||
s16 *lmu = user->lmu;
|
||||
s16 *si = user->si;
|
||||
s32 *mu = user->mu;
|
||||
s32 *dmu = user->dmu;
|
||||
s32 *delta = user->delta;
|
||||
int degree = get_sectorsize(user) == 512 ? 13 : 14;
|
||||
int cw_len = BIT(degree) - 1;
|
||||
int strength = get_strength(user);
|
||||
int num = 2 * strength + 1;
|
||||
s16 *index_of = (s16 *)user->gf_tables->index_of;
|
||||
s16 *alpha_to = (s16 *)user->gf_tables->alpha_to;
|
||||
int i, j, k;
|
||||
u32 dmu_0_count, tmp;
|
||||
s16 *smu = user->smu;
|
||||
|
||||
/* index of largest delta */
|
||||
int ro;
|
||||
int largest;
|
||||
int diff;
|
||||
|
||||
dmu_0_count = 0;
|
||||
|
||||
/* First Row */
|
||||
|
||||
/* Mu */
|
||||
mu[0] = -1;
|
||||
|
||||
memset(smu, 0, sizeof(s16) * num);
|
||||
smu[0] = 1;
|
||||
|
||||
/* discrepancy set to 1 */
|
||||
dmu[0] = 1;
|
||||
/* polynom order set to 0 */
|
||||
lmu[0] = 0;
|
||||
delta[0] = (mu[0] * 2 - lmu[0]) >> 1;
|
||||
|
||||
/* Second Row */
|
||||
|
||||
/* Mu */
|
||||
mu[1] = 0;
|
||||
/* Sigma(x) set to 1 */
|
||||
memset(&smu[num], 0, sizeof(s16) * num);
|
||||
smu[num] = 1;
|
||||
|
||||
/* discrepancy set to S1 */
|
||||
dmu[1] = si[1];
|
||||
|
||||
/* polynom order set to 0 */
|
||||
lmu[1] = 0;
|
||||
|
||||
delta[1] = (mu[1] * 2 - lmu[1]) >> 1;
|
||||
|
||||
/* Init the Sigma(x) last row */
|
||||
memset(&smu[(strength + 1) * num], 0, sizeof(s16) * num);
|
||||
|
||||
for (i = 1; i <= strength; i++) {
|
||||
mu[i + 1] = i << 1;
|
||||
/* Begin Computing Sigma (Mu+1) and L(mu) */
|
||||
/* check if discrepancy is set to 0 */
|
||||
if (dmu[i] == 0) {
|
||||
dmu_0_count++;
|
||||
|
||||
tmp = ((strength - (lmu[i] >> 1) - 1) / 2);
|
||||
if ((strength - (lmu[i] >> 1) - 1) & 0x1)
|
||||
tmp += 2;
|
||||
else
|
||||
tmp += 1;
|
||||
|
||||
if (dmu_0_count == tmp) {
|
||||
for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
|
||||
smu[(strength + 1) * num + j] =
|
||||
smu[i * num + j];
|
||||
|
||||
lmu[strength + 1] = lmu[i];
|
||||
return;
|
||||
}
|
||||
|
||||
/* copy polynom */
|
||||
for (j = 0; j <= lmu[i] >> 1; j++)
|
||||
smu[(i + 1) * num + j] = smu[i * num + j];
|
||||
|
||||
/* copy previous polynom order to the next */
|
||||
lmu[i + 1] = lmu[i];
|
||||
} else {
|
||||
ro = 0;
|
||||
largest = -1;
|
||||
/* find largest delta with dmu != 0 */
|
||||
for (j = 0; j < i; j++) {
|
||||
if ((dmu[j]) && (delta[j] > largest)) {
|
||||
largest = delta[j];
|
||||
ro = j;
|
||||
}
|
||||
}
|
||||
|
||||
/* compute difference */
|
||||
diff = (mu[i] - mu[ro]);
|
||||
|
||||
/* Compute degree of the new smu polynomial */
|
||||
if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
|
||||
lmu[i + 1] = lmu[i];
|
||||
else
|
||||
lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
|
||||
|
||||
/* Init smu[i+1] with 0 */
|
||||
for (k = 0; k < num; k++)
|
||||
smu[(i + 1) * num + k] = 0;
|
||||
|
||||
/* Compute smu[i+1] */
|
||||
for (k = 0; k <= lmu[ro] >> 1; k++) {
|
||||
s16 a, b, c;
|
||||
|
||||
if (!(smu[ro * num + k] && dmu[i]))
|
||||
continue;
|
||||
|
||||
a = index_of[dmu[i]];
|
||||
b = index_of[dmu[ro]];
|
||||
c = index_of[smu[ro * num + k]];
|
||||
tmp = a + (cw_len - b) + c;
|
||||
a = alpha_to[tmp % cw_len];
|
||||
smu[(i + 1) * num + (k + diff)] = a;
|
||||
}
|
||||
|
||||
for (k = 0; k <= lmu[i] >> 1; k++)
|
||||
smu[(i + 1) * num + k] ^= smu[i * num + k];
|
||||
}
|
||||
|
||||
/* End Computing Sigma (Mu+1) and L(mu) */
|
||||
/* In either case compute delta */
|
||||
delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
|
||||
|
||||
/* Do not compute discrepancy for the last iteration */
|
||||
if (i >= strength)
|
||||
continue;
|
||||
|
||||
for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
|
||||
tmp = 2 * (i - 1);
|
||||
if (k == 0) {
|
||||
dmu[i + 1] = si[tmp + 3];
|
||||
} else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
|
||||
s16 a, b, c;
|
||||
|
||||
a = index_of[smu[(i + 1) * num + k]];
|
||||
b = si[2 * (i - 1) + 3 - k];
|
||||
c = index_of[b];
|
||||
tmp = a + c;
|
||||
tmp %= cw_len;
|
||||
dmu[i + 1] = alpha_to[tmp] ^ dmu[i + 1];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int atmel_pmecc_err_location(struct atmel_pmecc_user *user)
|
||||
{
|
||||
int sector_size = get_sectorsize(user);
|
||||
int degree = sector_size == 512 ? 13 : 14;
|
||||
struct atmel_pmecc *pmecc = user->pmecc;
|
||||
int strength = get_strength(user);
|
||||
int ret, roots_nbr, i, err_nbr = 0;
|
||||
int num = (2 * strength) + 1;
|
||||
s16 *smu = user->smu;
|
||||
u32 val;
|
||||
|
||||
writel(PMERRLOC_DISABLE, pmecc->regs.errloc + ATMEL_PMERRLOC_ELDIS);
|
||||
|
||||
for (i = 0; i <= user->lmu[strength + 1] >> 1; i++) {
|
||||
writel_relaxed(smu[(strength + 1) * num + i],
|
||||
pmecc->regs.errloc + ATMEL_PMERRLOC_SIGMA(i));
|
||||
err_nbr++;
|
||||
}
|
||||
|
||||
val = (err_nbr - 1) << 16;
|
||||
if (sector_size == 1024)
|
||||
val |= 1;
|
||||
|
||||
writel(val, pmecc->regs.errloc + ATMEL_PMERRLOC_ELCFG);
|
||||
writel((sector_size * 8) + (degree * strength),
|
||||
pmecc->regs.errloc + ATMEL_PMERRLOC_ELEN);
|
||||
|
||||
ret = readl_relaxed_poll_timeout(pmecc->regs.errloc +
|
||||
ATMEL_PMERRLOC_ELISR,
|
||||
val, val & PMERRLOC_CALC_DONE,
|
||||
PMECC_MAX_TIMEOUT_MS * 1000);
|
||||
if (ret) {
|
||||
dev_err(pmecc->dev,
|
||||
"PMECC: Timeout to calculate error location.\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
roots_nbr = (val & PMERRLOC_ERR_NUM_MASK) >> 8;
|
||||
/* Number of roots == degree of smu hence <= cap */
|
||||
if (roots_nbr == user->lmu[strength + 1] >> 1)
|
||||
return err_nbr - 1;
|
||||
|
||||
/*
|
||||
* Number of roots does not match the degree of smu
|
||||
* unable to correct error.
|
||||
*/
|
||||
return -EBADMSG;
|
||||
}
|
||||
|
||||
int atmel_pmecc_correct_sector(struct atmel_pmecc_user *user, int sector,
|
||||
void *data, void *ecc)
|
||||
{
|
||||
struct atmel_pmecc *pmecc = user->pmecc;
|
||||
int sectorsize = get_sectorsize(user);
|
||||
int eccbytes = user->eccbytes;
|
||||
int i, nerrors;
|
||||
|
||||
if (!(user->isr & BIT(sector)))
|
||||
return 0;
|
||||
|
||||
atmel_pmecc_gen_syndrome(user, sector);
|
||||
atmel_pmecc_substitute(user);
|
||||
atmel_pmecc_get_sigma(user);
|
||||
|
||||
nerrors = atmel_pmecc_err_location(user);
|
||||
if (nerrors < 0)
|
||||
return nerrors;
|
||||
|
||||
for (i = 0; i < nerrors; i++) {
|
||||
const char *area;
|
||||
int byte, bit;
|
||||
u32 errpos;
|
||||
u8 *ptr;
|
||||
|
||||
errpos = readl_relaxed(pmecc->regs.errloc +
|
||||
ATMEL_PMERRLOC_EL(pmecc->caps->el_offset, i));
|
||||
errpos--;
|
||||
|
||||
byte = errpos / 8;
|
||||
bit = errpos % 8;
|
||||
|
||||
if (byte < sectorsize) {
|
||||
ptr = data + byte;
|
||||
area = "data";
|
||||
} else if (byte < sectorsize + eccbytes) {
|
||||
ptr = ecc + byte - sectorsize;
|
||||
area = "ECC";
|
||||
} else {
|
||||
dev_dbg(pmecc->dev,
|
||||
"Invalid errpos value (%d, max is %d)\n",
|
||||
errpos, (sectorsize + eccbytes) * 8);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
dev_dbg(pmecc->dev,
|
||||
"Bit flip in %s area, byte %d: 0x%02x -> 0x%02x\n",
|
||||
area, byte, *ptr, (unsigned int)(*ptr ^ BIT(bit)));
|
||||
|
||||
*ptr ^= BIT(bit);
|
||||
}
|
||||
|
||||
return nerrors;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_correct_sector);
|
||||
|
||||
bool atmel_pmecc_correct_erased_chunks(struct atmel_pmecc_user *user)
|
||||
{
|
||||
return user->pmecc->caps->correct_erased_chunks;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_correct_erased_chunks);
|
||||
|
||||
void atmel_pmecc_get_generated_eccbytes(struct atmel_pmecc_user *user,
|
||||
int sector, void *ecc)
|
||||
{
|
||||
struct atmel_pmecc *pmecc = user->pmecc;
|
||||
u8 *ptr = ecc;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < user->eccbytes; i++)
|
||||
ptr[i] = readb_relaxed(pmecc->regs.base +
|
||||
ATMEL_PMECC_ECC(sector, i));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_get_generated_eccbytes);
|
||||
|
||||
void atmel_pmecc_reset(struct atmel_pmecc *pmecc)
|
||||
{
|
||||
writel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);
|
||||
writel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_reset);
|
||||
|
||||
int atmel_pmecc_enable(struct atmel_pmecc_user *user, int op)
|
||||
{
|
||||
struct atmel_pmecc *pmecc = user->pmecc;
|
||||
u32 cfg;
|
||||
|
||||
if (op != NAND_ECC_READ && op != NAND_ECC_WRITE) {
|
||||
dev_err(pmecc->dev, "Bad ECC operation!");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
mutex_lock(&user->pmecc->lock);
|
||||
|
||||
cfg = user->cache.cfg;
|
||||
if (op == NAND_ECC_WRITE)
|
||||
cfg |= PMECC_CFG_WRITE_OP;
|
||||
else
|
||||
cfg |= PMECC_CFG_AUTO_ENABLE;
|
||||
|
||||
writel(cfg, pmecc->regs.base + ATMEL_PMECC_CFG);
|
||||
writel(user->cache.sarea, pmecc->regs.base + ATMEL_PMECC_SAREA);
|
||||
writel(user->cache.saddr, pmecc->regs.base + ATMEL_PMECC_SADDR);
|
||||
writel(user->cache.eaddr, pmecc->regs.base + ATMEL_PMECC_EADDR);
|
||||
|
||||
writel(PMECC_CTRL_ENABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);
|
||||
writel(PMECC_CTRL_DATA, pmecc->regs.base + ATMEL_PMECC_CTRL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_enable);
|
||||
|
||||
void atmel_pmecc_disable(struct atmel_pmecc_user *user)
|
||||
{
|
||||
atmel_pmecc_reset(user->pmecc);
|
||||
mutex_unlock(&user->pmecc->lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_disable);
|
||||
|
||||
int atmel_pmecc_wait_rdy(struct atmel_pmecc_user *user)
|
||||
{
|
||||
struct atmel_pmecc *pmecc = user->pmecc;
|
||||
u32 status;
|
||||
int ret;
|
||||
|
||||
ret = readl_relaxed_poll_timeout(pmecc->regs.base +
|
||||
ATMEL_PMECC_SR,
|
||||
status, !(status & PMECC_SR_BUSY),
|
||||
PMECC_MAX_TIMEOUT_MS * 1000);
|
||||
if (ret) {
|
||||
dev_err(pmecc->dev,
|
||||
"Timeout while waiting for PMECC ready.\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
user->isr = readl_relaxed(pmecc->regs.base + ATMEL_PMECC_ISR);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(atmel_pmecc_wait_rdy);
|
||||
|
||||
#define ATMEL_BASE_PMECC 0xffffe000
|
||||
#define ATMEL_BASE_PMERRLOC 0xffffe600
|
||||
|
||||
static struct atmel_pmecc *
|
||||
atmel_pmecc_create(struct udevice *dev,
|
||||
const struct atmel_pmecc_caps *caps,
|
||||
int pmecc_res_idx, int errloc_res_idx,
|
||||
int timing_res_idx)
|
||||
{
|
||||
struct atmel_pmecc *pmecc;
|
||||
struct resource res;
|
||||
|
||||
pmecc = devm_kzalloc(dev, sizeof(*pmecc), GFP_KERNEL);
|
||||
if (!pmecc)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
pmecc->caps = caps;
|
||||
pmecc->dev = dev;
|
||||
mutex_init(&pmecc->lock);
|
||||
|
||||
ofnode_read_resource(dev->node_, 0, &res);
|
||||
pmecc->regs.base = (void *)res.start;
|
||||
ofnode_read_resource(dev->node_, 1, &res);
|
||||
pmecc->regs.errloc = (void *)res.start;
|
||||
|
||||
pmecc->regs.timing = 0;
|
||||
|
||||
/* Disable all interrupts before registering the PMECC handler. */
|
||||
writel(0xffffffff, pmecc->regs.base + ATMEL_PMECC_IDR);
|
||||
atmel_pmecc_reset(pmecc);
|
||||
|
||||
return pmecc;
|
||||
}
|
||||
|
||||
static void devm_atmel_pmecc_put(struct udevice *dev, void *res)
|
||||
{
|
||||
}
|
||||
|
||||
static struct atmel_pmecc *atmel_pmecc_get_by_node(struct udevice *dev)
|
||||
{
|
||||
struct atmel_pmecc *pmecc, **ptr;
|
||||
int ret;
|
||||
|
||||
pmecc = dev_get_plat(dev);
|
||||
if (!pmecc) {
|
||||
ret = -EPROBE_DEFER;
|
||||
goto err_put_device;
|
||||
}
|
||||
|
||||
ptr = devres_alloc(devm_atmel_pmecc_put, sizeof(*ptr), GFP_KERNEL);
|
||||
if (!ptr) {
|
||||
ret = -ENOMEM;
|
||||
goto err_put_device;
|
||||
}
|
||||
|
||||
*ptr = pmecc;
|
||||
|
||||
devres_add(dev, ptr);
|
||||
|
||||
return pmecc;
|
||||
|
||||
err_put_device:
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
static const int atmel_pmecc_strengths[] = { 2, 4, 8, 12, 24, 32 };
|
||||
|
||||
static struct atmel_pmecc_caps at91sam9g45_caps = {
|
||||
.strengths = atmel_pmecc_strengths,
|
||||
.nstrengths = 5,
|
||||
.el_offset = 0x8c,
|
||||
};
|
||||
|
||||
static struct atmel_pmecc_caps sama5d4_caps = {
|
||||
.strengths = atmel_pmecc_strengths,
|
||||
.nstrengths = 5,
|
||||
.el_offset = 0x8c,
|
||||
.correct_erased_chunks = true,
|
||||
};
|
||||
|
||||
static struct atmel_pmecc_caps sama5d2_caps = {
|
||||
.strengths = atmel_pmecc_strengths,
|
||||
.nstrengths = 6,
|
||||
.el_offset = 0xac,
|
||||
.correct_erased_chunks = true,
|
||||
};
|
||||
|
||||
struct atmel_pmecc *devm_atmel_pmecc_get(struct udevice *userdev)
|
||||
{
|
||||
struct atmel_pmecc *pmecc;
|
||||
struct ofnode_phandle_args args;
|
||||
struct udevice *pdev;
|
||||
int ret;
|
||||
|
||||
if (!userdev)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
ret = ofnode_parse_phandle_with_args(userdev->node_,
|
||||
"ecc-engine",
|
||||
NULL, 0, 0, &args);
|
||||
ret = uclass_get_device_by_ofnode(UCLASS_MTD, args.node, &pdev);
|
||||
if (ret)
|
||||
return NULL;
|
||||
|
||||
pmecc = atmel_pmecc_get_by_node(pdev);
|
||||
|
||||
/* TODO:
|
||||
* Support old DT bindings
|
||||
*/
|
||||
|
||||
return pmecc;
|
||||
}
|
||||
EXPORT_SYMBOL(devm_atmel_pmecc_get);
|
||||
|
||||
static const struct udevice_id atmel_pmecc_match[] = {
|
||||
{ .compatible = "atmel,at91sam9g45-pmecc", (ulong)&at91sam9g45_caps },
|
||||
{ .compatible = "atmel,sama5d4-pmecc", (ulong)&sama5d4_caps },
|
||||
{ .compatible = "atmel,sama5d2-pmecc", (ulong)&sama5d2_caps },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
|
||||
static int atmel_pmecc_probe(struct udevice *dev)
|
||||
{
|
||||
const struct atmel_pmecc_caps *caps;
|
||||
struct atmel_pmecc *pmecc;
|
||||
|
||||
caps = (struct atmel_pmecc_caps *)dev_get_driver_data(dev);
|
||||
if (!caps) {
|
||||
dev_err(dev, "Invalid caps\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
pmecc = atmel_pmecc_create(dev, caps, 0, 1, 2);
|
||||
if (IS_ERR(pmecc))
|
||||
return PTR_ERR(pmecc);
|
||||
|
||||
dev->plat_ = pmecc;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
U_BOOT_DRIVER(atmel_pmecc) = {
|
||||
.name = "atmel-pmecc",
|
||||
.id = UCLASS_MTD,
|
||||
.of_match = atmel_pmecc_match,
|
||||
.probe = atmel_pmecc_probe,
|
||||
};
|
||||
94
drivers/mtd/nand/raw/atmel/pmecc.h
Normal file
94
drivers/mtd/nand/raw/atmel/pmecc.h
Normal file
@@ -0,0 +1,94 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* © Copyright 2016 ATMEL
|
||||
* © Copyright 2016 Free Electrons
|
||||
*
|
||||
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
|
||||
*
|
||||
* Derived from the atmel_nand.c driver which contained the following
|
||||
* copyrights:
|
||||
*
|
||||
* Copyright © 2003 Rick Bronson
|
||||
*
|
||||
* Derived from drivers/mtd/nand/autcpu12.c (removed in v3.8)
|
||||
* Copyright © 2001 Thomas Gleixner (gleixner@autronix.de)
|
||||
*
|
||||
* Derived from drivers/mtd/spia.c (removed in v3.8)
|
||||
* Copyright © 2000 Steven J. Hill (sjhill@cotw.com)
|
||||
*
|
||||
*
|
||||
* Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
|
||||
* Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright © 2007
|
||||
*
|
||||
* Derived from Das U-Boot source code
|
||||
* (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
|
||||
* © Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
|
||||
*
|
||||
* Add Programmable Multibit ECC support for various AT91 SoC
|
||||
* © Copyright 2012 ATMEL, Hong Xu
|
||||
*
|
||||
* Add Nand Flash Controller support for SAMA5 SoC
|
||||
* © Copyright 2013 ATMEL, Josh Wu (josh.wu@atmel.com)
|
||||
*/
|
||||
|
||||
#ifndef ATMEL_PMECC_H
|
||||
#define ATMEL_PMECC_H
|
||||
|
||||
#define ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH 0
|
||||
#define ATMEL_PMECC_SECTOR_SIZE_AUTO 0
|
||||
#define ATMEL_PMECC_OOBOFFSET_AUTO -1
|
||||
|
||||
struct atmel_pmecc_user_req {
|
||||
int pagesize;
|
||||
int oobsize;
|
||||
struct {
|
||||
int strength;
|
||||
int bytes;
|
||||
int sectorsize;
|
||||
int nsectors;
|
||||
int ooboffset;
|
||||
} ecc;
|
||||
};
|
||||
|
||||
struct atmel_pmecc_suspend_ctx {
|
||||
u32 setup;
|
||||
u32 pulse;
|
||||
u32 cycle;
|
||||
u32 timings;
|
||||
u32 mode;
|
||||
};
|
||||
|
||||
struct atmel_pmecc {
|
||||
struct udevice *dev;
|
||||
const struct atmel_pmecc_caps *caps;
|
||||
|
||||
struct {
|
||||
void __iomem *base;
|
||||
void __iomem *errloc;
|
||||
void __iomem *timing;
|
||||
} regs;
|
||||
|
||||
/* Mutex used for pmecc enable/disable */
|
||||
struct mutex lock;
|
||||
|
||||
struct atmel_pmecc_suspend_ctx suspend;
|
||||
};
|
||||
|
||||
struct atmel_pmecc *devm_atmel_pmecc_get(struct udevice *dev);
|
||||
|
||||
struct atmel_pmecc_user *
|
||||
atmel_pmecc_create_user(struct atmel_pmecc *pmecc,
|
||||
struct atmel_pmecc_user_req *req);
|
||||
void atmel_pmecc_destroy_user(struct atmel_pmecc_user *user);
|
||||
|
||||
void atmel_pmecc_reset(struct atmel_pmecc *pmecc);
|
||||
int atmel_pmecc_enable(struct atmel_pmecc_user *user, int op);
|
||||
void atmel_pmecc_disable(struct atmel_pmecc_user *user);
|
||||
int atmel_pmecc_wait_rdy(struct atmel_pmecc_user *user);
|
||||
int atmel_pmecc_correct_sector(struct atmel_pmecc_user *user, int sector,
|
||||
void *data, void *ecc);
|
||||
bool atmel_pmecc_correct_erased_chunks(struct atmel_pmecc_user *user);
|
||||
void atmel_pmecc_get_generated_eccbytes(struct atmel_pmecc_user *user,
|
||||
int sector, void *ecc);
|
||||
|
||||
#endif /* ATMEL_PMECC_H */
|
||||
Reference in New Issue
Block a user