From da3bcb392e852214b0dda878f6161c8f1e8d15f3 Mon Sep 17 00:00:00 2001 From: Zachary T Welch Date: Fri, 4 Dec 2009 21:38:13 -0800 Subject: move remaining nand helper files Move remaining NAND implementation files into src/flash/nand/. --- src/flash/Makefile.am | 4 - src/flash/arm_nandio.c | 246 --------------------------------------------- src/flash/arm_nandio.h | 60 ----------- src/flash/nand/Makefile.am | 4 + src/flash/nand/arm_io.c | 246 +++++++++++++++++++++++++++++++++++++++++++++ src/flash/nand/arm_io.h | 60 +++++++++++ src/flash/nand/davinci.c | 2 +- src/flash/nand/ecc.c | 122 ++++++++++++++++++++++ src/flash/nand/ecc_kw.c | 172 +++++++++++++++++++++++++++++++ src/flash/nand/orion.c | 2 +- src/flash/nand_ecc.c | 122 ---------------------- src/flash/nand_ecc_kw.c | 174 -------------------------------- 12 files changed, 606 insertions(+), 608 deletions(-) delete mode 100644 src/flash/arm_nandio.c delete mode 100644 src/flash/arm_nandio.h create mode 100644 src/flash/nand/arm_io.c create mode 100644 src/flash/nand/arm_io.h create mode 100644 src/flash/nand/ecc.c create mode 100644 src/flash/nand/ecc_kw.c delete mode 100644 src/flash/nand_ecc.c delete mode 100644 src/flash/nand_ecc_kw.c (limited to 'src/flash') diff --git a/src/flash/Makefile.am b/src/flash/Makefile.am index 2144ff2d..f8d70883 100644 --- a/src/flash/Makefile.am +++ b/src/flash/Makefile.am @@ -9,9 +9,6 @@ METASOURCES = AUTO noinst_LTLIBRARIES = libflash.la libflash_la_SOURCES = \ common.c \ - arm_nandio.c \ - nand_ecc.c \ - nand_ecc_kw.c \ mflash.c libflash_la_LIBADD = \ @@ -19,7 +16,6 @@ libflash_la_LIBADD = \ $(top_builddir)/src/flash/nand/libocdflashnand.la noinst_HEADERS = \ - arm_nandio.h \ common.h \ mflash.h \ nand.h diff --git a/src/flash/arm_nandio.c b/src/flash/arm_nandio.c deleted file mode 100644 index 67619d54..00000000 --- a/src/flash/arm_nandio.c +++ /dev/null @@ -1,246 +0,0 @@ -/* - * Copyright (C) 2009 by Marvell Semiconductors, Inc. - * Written by Nicolas Pitre - * - * Copyright (C) 2009 by David Brownell - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the - * Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "arm_nandio.h" -#include -#include - -/** - * Copies code to a working area. This will allocate room for the code plus the - * additional amount requested if the working area pointer is null. - * - * @param target Pointer to the target to copy code to - * @param code Pointer to the code area to be copied - * @param code_size Size of the code being copied - * @param additional Size of the additional area to be allocated in addition to - * code - * @param area Pointer to a pointer to a working area to copy code to - * @return Success or failure of the operation - */ -int arm_code_to_working_area(struct target *target, - const uint32_t *code, unsigned code_size, - unsigned additional, struct working_area **area) -{ - uint8_t code_buf[code_size]; - unsigned i; - int retval; - unsigned size = code_size + additional; - - /* REVISIT this assumes size doesn't ever change. - * That's usually correct; but there are boards with - * both large and small page chips, where it won't be... - */ - - /* make sure we have a working area */ - if (NULL == *area) { - retval = target_alloc_working_area(target, size, area); - if (retval != ERROR_OK) { - LOG_DEBUG("%s: no %d byte buffer", __FUNCTION__, (int) size); - return ERROR_NAND_NO_BUFFER; - } - } - - /* buffer code in target endianness */ - for (i = 0; i < code_size / 4; i++) - target_buffer_set_u32(target, code_buf + i * 4, code[i]); - - /* copy code to work area */ - retval = target_write_memory(target, (*area)->address, - 4, code_size / 4, code_buf); - - return retval; -} - -/** - * ARM-specific bulk write from buffer to address of 8-bit wide NAND. - * For now this only supports ARMv4 and ARMv5 cores. - * - * Enhancements to target_run_algorithm() could enable: - * - ARMv6 and ARMv7 cores in ARM mode - * - * Different code fragments could handle: - * - Thumb2 cores like Cortex-M (needs different byteswapping) - * - 16-bit wide data (needs different setup too) - * - * @param nand Pointer to the arm_nand_data struct that defines the I/O - * @param data Pointer to the data to be copied to flash - * @param size Size of the data being copied - * @return Success or failure of the operation - */ -int arm_nandwrite(struct arm_nand_data *nand, uint8_t *data, int size) -{ - struct target *target = nand->target; - struct arm_algorithm algo; - struct arm *armv4_5 = target->arch_info; - struct reg_param reg_params[3]; - uint32_t target_buf; - uint32_t exit = 0; - int retval; - - /* Inputs: - * r0 NAND data address (byte wide) - * r1 buffer address - * r2 buffer length - */ - static const uint32_t code[] = { - 0xe4d13001, /* s: ldrb r3, [r1], #1 */ - 0xe5c03000, /* strb r3, [r0] */ - 0xe2522001, /* subs r2, r2, #1 */ - 0x1afffffb, /* bne s */ - - /* exit: ARMv4 needs hardware breakpoint */ - 0xe1200070, /* e: bkpt #0 */ - }; - - if (nand->op != ARM_NAND_WRITE || !nand->copy_area) { - retval = arm_code_to_working_area(target, code, sizeof(code), - nand->chunk_size, &nand->copy_area); - if (retval != ERROR_OK) { - return retval; - } - } - - nand->op = ARM_NAND_WRITE; - - /* copy data to work area */ - target_buf = nand->copy_area->address + sizeof(code); - retval = target_bulk_write_memory(target, target_buf, size / 4, data); - if (retval == ERROR_OK && (size & 3) != 0) - retval = target_write_memory(target, - target_buf + (size & ~3), - 1, size & 3, data + (size & ~3)); - if (retval != ERROR_OK) - return retval; - - /* set up algorithm and parameters */ - algo.common_magic = ARM_COMMON_MAGIC; - algo.core_mode = ARM_MODE_SVC; - algo.core_state = ARM_STATE_ARM; - - init_reg_param(®_params[0], "r0", 32, PARAM_IN); - init_reg_param(®_params[1], "r1", 32, PARAM_IN); - init_reg_param(®_params[2], "r2", 32, PARAM_IN); - - buf_set_u32(reg_params[0].value, 0, 32, nand->data); - buf_set_u32(reg_params[1].value, 0, 32, target_buf); - buf_set_u32(reg_params[2].value, 0, 32, size); - - /* armv4 must exit using a hardware breakpoint */ - if (armv4_5->is_armv4) - exit = nand->copy_area->address + sizeof(code) - 4; - - /* use alg to write data from work area to NAND chip */ - retval = target_run_algorithm(target, 0, NULL, 3, reg_params, - nand->copy_area->address, exit, 1000, &algo); - if (retval != ERROR_OK) - LOG_ERROR("error executing hosted NAND write"); - - destroy_reg_param(®_params[0]); - destroy_reg_param(®_params[1]); - destroy_reg_param(®_params[2]); - - return retval; -} - -/** - * Uses an on-chip algorithm for an ARM device to read from a NAND device and - * store the data into the host machine's memory. - * - * @param nand Pointer to the arm_nand_data struct that defines the I/O - * @param data Pointer to the data buffer to store the read data - * @param size Amount of data to be stored to the buffer. - * @return Success or failure of the operation - */ -int arm_nandread(struct arm_nand_data *nand, uint8_t *data, uint32_t size) -{ - struct target *target = nand->target; - struct arm_algorithm algo; - struct arm *armv4_5 = target->arch_info; - struct reg_param reg_params[3]; - uint32_t target_buf; - uint32_t exit = 0; - int retval; - - /* Inputs: - * r0 buffer address - * r1 NAND data address (byte wide) - * r2 buffer length - */ - static const uint32_t code[] = { - 0xe5d13000, /* s: ldrb r3, [r1] */ - 0xe4c03001, /* strb r3, [r0], #1 */ - 0xe2522001, /* subs r2, r2, #1 */ - 0x1afffffb, /* bne s */ - - /* exit: ARMv4 needs hardware breakpoint */ - 0xe1200070, /* e: bkpt #0 */ - }; - - /* create the copy area if not yet available */ - if (nand->op != ARM_NAND_READ || !nand->copy_area) { - retval = arm_code_to_working_area(target, code, sizeof(code), - nand->chunk_size, &nand->copy_area); - if (retval != ERROR_OK) { - return retval; - } - } - - nand->op = ARM_NAND_READ; - target_buf = nand->copy_area->address + sizeof(code); - - /* set up algorithm and parameters */ - algo.common_magic = ARM_COMMON_MAGIC; - algo.core_mode = ARM_MODE_SVC; - algo.core_state = ARM_STATE_ARM; - - init_reg_param(®_params[0], "r0", 32, PARAM_IN); - init_reg_param(®_params[1], "r1", 32, PARAM_IN); - init_reg_param(®_params[2], "r2", 32, PARAM_IN); - - buf_set_u32(reg_params[0].value, 0, 32, target_buf); - buf_set_u32(reg_params[1].value, 0, 32, nand->data); - buf_set_u32(reg_params[2].value, 0, 32, size); - - /* armv4 must exit using a hardware breakpoint */ - if (armv4_5->is_armv4) - exit = nand->copy_area->address + sizeof(code) - 4; - - /* use alg to write data from NAND chip to work area */ - retval = target_run_algorithm(target, 0, NULL, 3, reg_params, - nand->copy_area->address, exit, 1000, &algo); - if (retval != ERROR_OK) - LOG_ERROR("error executing hosted NAND read"); - - destroy_reg_param(®_params[0]); - destroy_reg_param(®_params[1]); - destroy_reg_param(®_params[2]); - - /* read from work area to the host's memory */ - retval = target_read_buffer(target, target_buf, size, data); - - return retval; -} - diff --git a/src/flash/arm_nandio.h b/src/flash/arm_nandio.h deleted file mode 100644 index d3504f43..00000000 --- a/src/flash/arm_nandio.h +++ /dev/null @@ -1,60 +0,0 @@ -/* - * Copyright (C) 2009 by David Brownell - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the - * Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ -#ifndef __ARM_NANDIO_H -#define __ARM_NANDIO_H - -#include -#include - -/** - * Available operational states the arm_nand_data struct can be in. - */ -enum arm_nand_op { - ARM_NAND_NONE, /**< No operation performed. */ - ARM_NAND_READ, /**< Read operation performed. */ - ARM_NAND_WRITE, /**< Write operation performed. */ -}; - -/** - * The arm_nand_data struct is used for defining NAND I/O operations on an ARM - * core. - */ -struct arm_nand_data { - /** Target is proxy for some ARM core. */ - struct target *target; - - /** The copy area holds code loop and data for I/O operations. */ - struct working_area *copy_area; - - /** The chunk size is the page size or ECC chunk. */ - unsigned chunk_size; - - /** Where data is read from or written to. */ - uint32_t data; - - /** Last operation executed using this struct. */ - enum arm_nand_op op; - - /* currently implicit: data width == 8 bits (not 16) */ -}; - -int arm_nandwrite(struct arm_nand_data *nand, uint8_t *data, int size); -int arm_nandread(struct arm_nand_data *nand, uint8_t *data, uint32_t size); - -#endif /* __ARM_NANDIO_H */ diff --git a/src/flash/nand/Makefile.am b/src/flash/nand/Makefile.am index 3885a7b9..667ef8fd 100644 --- a/src/flash/nand/Makefile.am +++ b/src/flash/nand/Makefile.am @@ -3,9 +3,12 @@ AM_CPPFLAGS = -I$(top_srcdir)/src noinst_LTLIBRARIES = libocdflashnand.la libocdflashnand_la_SOURCES = \ + ecc.c \ + ecc_kw.c \ core.c \ fileio.c \ tcl.c \ + arm_io.c \ $(NAND_DRIVERS) \ driver.c @@ -22,6 +25,7 @@ NAND_DRIVERS = \ s3c2443.c noinst_HEADERS = \ + arm_io.h \ lpc3180.h \ driver.h \ mx3.h \ diff --git a/src/flash/nand/arm_io.c b/src/flash/nand/arm_io.c new file mode 100644 index 00000000..cc565dcb --- /dev/null +++ b/src/flash/nand/arm_io.c @@ -0,0 +1,246 @@ +/* + * Copyright (C) 2009 by Marvell Semiconductors, Inc. + * Written by Nicolas Pitre + * + * Copyright (C) 2009 by David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "arm_io.h" +#include +#include + +/** + * Copies code to a working area. This will allocate room for the code plus the + * additional amount requested if the working area pointer is null. + * + * @param target Pointer to the target to copy code to + * @param code Pointer to the code area to be copied + * @param code_size Size of the code being copied + * @param additional Size of the additional area to be allocated in addition to + * code + * @param area Pointer to a pointer to a working area to copy code to + * @return Success or failure of the operation + */ +int arm_code_to_working_area(struct target *target, + const uint32_t *code, unsigned code_size, + unsigned additional, struct working_area **area) +{ + uint8_t code_buf[code_size]; + unsigned i; + int retval; + unsigned size = code_size + additional; + + /* REVISIT this assumes size doesn't ever change. + * That's usually correct; but there are boards with + * both large and small page chips, where it won't be... + */ + + /* make sure we have a working area */ + if (NULL == *area) { + retval = target_alloc_working_area(target, size, area); + if (retval != ERROR_OK) { + LOG_DEBUG("%s: no %d byte buffer", __FUNCTION__, (int) size); + return ERROR_NAND_NO_BUFFER; + } + } + + /* buffer code in target endianness */ + for (i = 0; i < code_size / 4; i++) + target_buffer_set_u32(target, code_buf + i * 4, code[i]); + + /* copy code to work area */ + retval = target_write_memory(target, (*area)->address, + 4, code_size / 4, code_buf); + + return retval; +} + +/** + * ARM-specific bulk write from buffer to address of 8-bit wide NAND. + * For now this only supports ARMv4 and ARMv5 cores. + * + * Enhancements to target_run_algorithm() could enable: + * - ARMv6 and ARMv7 cores in ARM mode + * + * Different code fragments could handle: + * - Thumb2 cores like Cortex-M (needs different byteswapping) + * - 16-bit wide data (needs different setup too) + * + * @param nand Pointer to the arm_nand_data struct that defines the I/O + * @param data Pointer to the data to be copied to flash + * @param size Size of the data being copied + * @return Success or failure of the operation + */ +int arm_nandwrite(struct arm_nand_data *nand, uint8_t *data, int size) +{ + struct target *target = nand->target; + struct arm_algorithm algo; + struct arm *armv4_5 = target->arch_info; + struct reg_param reg_params[3]; + uint32_t target_buf; + uint32_t exit = 0; + int retval; + + /* Inputs: + * r0 NAND data address (byte wide) + * r1 buffer address + * r2 buffer length + */ + static const uint32_t code[] = { + 0xe4d13001, /* s: ldrb r3, [r1], #1 */ + 0xe5c03000, /* strb r3, [r0] */ + 0xe2522001, /* subs r2, r2, #1 */ + 0x1afffffb, /* bne s */ + + /* exit: ARMv4 needs hardware breakpoint */ + 0xe1200070, /* e: bkpt #0 */ + }; + + if (nand->op != ARM_NAND_WRITE || !nand->copy_area) { + retval = arm_code_to_working_area(target, code, sizeof(code), + nand->chunk_size, &nand->copy_area); + if (retval != ERROR_OK) { + return retval; + } + } + + nand->op = ARM_NAND_WRITE; + + /* copy data to work area */ + target_buf = nand->copy_area->address + sizeof(code); + retval = target_bulk_write_memory(target, target_buf, size / 4, data); + if (retval == ERROR_OK && (size & 3) != 0) + retval = target_write_memory(target, + target_buf + (size & ~3), + 1, size & 3, data + (size & ~3)); + if (retval != ERROR_OK) + return retval; + + /* set up algorithm and parameters */ + algo.common_magic = ARM_COMMON_MAGIC; + algo.core_mode = ARM_MODE_SVC; + algo.core_state = ARM_STATE_ARM; + + init_reg_param(®_params[0], "r0", 32, PARAM_IN); + init_reg_param(®_params[1], "r1", 32, PARAM_IN); + init_reg_param(®_params[2], "r2", 32, PARAM_IN); + + buf_set_u32(reg_params[0].value, 0, 32, nand->data); + buf_set_u32(reg_params[1].value, 0, 32, target_buf); + buf_set_u32(reg_params[2].value, 0, 32, size); + + /* armv4 must exit using a hardware breakpoint */ + if (armv4_5->is_armv4) + exit = nand->copy_area->address + sizeof(code) - 4; + + /* use alg to write data from work area to NAND chip */ + retval = target_run_algorithm(target, 0, NULL, 3, reg_params, + nand->copy_area->address, exit, 1000, &algo); + if (retval != ERROR_OK) + LOG_ERROR("error executing hosted NAND write"); + + destroy_reg_param(®_params[0]); + destroy_reg_param(®_params[1]); + destroy_reg_param(®_params[2]); + + return retval; +} + +/** + * Uses an on-chip algorithm for an ARM device to read from a NAND device and + * store the data into the host machine's memory. + * + * @param nand Pointer to the arm_nand_data struct that defines the I/O + * @param data Pointer to the data buffer to store the read data + * @param size Amount of data to be stored to the buffer. + * @return Success or failure of the operation + */ +int arm_nandread(struct arm_nand_data *nand, uint8_t *data, uint32_t size) +{ + struct target *target = nand->target; + struct arm_algorithm algo; + struct arm *armv4_5 = target->arch_info; + struct reg_param reg_params[3]; + uint32_t target_buf; + uint32_t exit = 0; + int retval; + + /* Inputs: + * r0 buffer address + * r1 NAND data address (byte wide) + * r2 buffer length + */ + static const uint32_t code[] = { + 0xe5d13000, /* s: ldrb r3, [r1] */ + 0xe4c03001, /* strb r3, [r0], #1 */ + 0xe2522001, /* subs r2, r2, #1 */ + 0x1afffffb, /* bne s */ + + /* exit: ARMv4 needs hardware breakpoint */ + 0xe1200070, /* e: bkpt #0 */ + }; + + /* create the copy area if not yet available */ + if (nand->op != ARM_NAND_READ || !nand->copy_area) { + retval = arm_code_to_working_area(target, code, sizeof(code), + nand->chunk_size, &nand->copy_area); + if (retval != ERROR_OK) { + return retval; + } + } + + nand->op = ARM_NAND_READ; + target_buf = nand->copy_area->address + sizeof(code); + + /* set up algorithm and parameters */ + algo.common_magic = ARM_COMMON_MAGIC; + algo.core_mode = ARM_MODE_SVC; + algo.core_state = ARM_STATE_ARM; + + init_reg_param(®_params[0], "r0", 32, PARAM_IN); + init_reg_param(®_params[1], "r1", 32, PARAM_IN); + init_reg_param(®_params[2], "r2", 32, PARAM_IN); + + buf_set_u32(reg_params[0].value, 0, 32, target_buf); + buf_set_u32(reg_params[1].value, 0, 32, nand->data); + buf_set_u32(reg_params[2].value, 0, 32, size); + + /* armv4 must exit using a hardware breakpoint */ + if (armv4_5->is_armv4) + exit = nand->copy_area->address + sizeof(code) - 4; + + /* use alg to write data from NAND chip to work area */ + retval = target_run_algorithm(target, 0, NULL, 3, reg_params, + nand->copy_area->address, exit, 1000, &algo); + if (retval != ERROR_OK) + LOG_ERROR("error executing hosted NAND read"); + + destroy_reg_param(®_params[0]); + destroy_reg_param(®_params[1]); + destroy_reg_param(®_params[2]); + + /* read from work area to the host's memory */ + retval = target_read_buffer(target, target_buf, size, data); + + return retval; +} + diff --git a/src/flash/nand/arm_io.h b/src/flash/nand/arm_io.h new file mode 100644 index 00000000..d3504f43 --- /dev/null +++ b/src/flash/nand/arm_io.h @@ -0,0 +1,60 @@ +/* + * Copyright (C) 2009 by David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +#ifndef __ARM_NANDIO_H +#define __ARM_NANDIO_H + +#include +#include + +/** + * Available operational states the arm_nand_data struct can be in. + */ +enum arm_nand_op { + ARM_NAND_NONE, /**< No operation performed. */ + ARM_NAND_READ, /**< Read operation performed. */ + ARM_NAND_WRITE, /**< Write operation performed. */ +}; + +/** + * The arm_nand_data struct is used for defining NAND I/O operations on an ARM + * core. + */ +struct arm_nand_data { + /** Target is proxy for some ARM core. */ + struct target *target; + + /** The copy area holds code loop and data for I/O operations. */ + struct working_area *copy_area; + + /** The chunk size is the page size or ECC chunk. */ + unsigned chunk_size; + + /** Where data is read from or written to. */ + uint32_t data; + + /** Last operation executed using this struct. */ + enum arm_nand_op op; + + /* currently implicit: data width == 8 bits (not 16) */ +}; + +int arm_nandwrite(struct arm_nand_data *nand, uint8_t *data, int size); +int arm_nandread(struct arm_nand_data *nand, uint8_t *data, uint32_t size); + +#endif /* __ARM_NANDIO_H */ diff --git a/src/flash/nand/davinci.c b/src/flash/nand/davinci.c index 66770737..0152b4d9 100644 --- a/src/flash/nand/davinci.c +++ b/src/flash/nand/davinci.c @@ -28,7 +28,7 @@ #include "config.h" #endif -#include +#include "arm_io.h" enum ecc { diff --git a/src/flash/nand/ecc.c b/src/flash/nand/ecc.c new file mode 100644 index 00000000..1e103d00 --- /dev/null +++ b/src/flash/nand/ecc.c @@ -0,0 +1,122 @@ +/* + * This file contains an ECC algorithm from Toshiba that allows for detection + * and correction of 1-bit errors in a 256 byte block of data. + * + * [ Extracted from the initial code found in some early Linux versions. + * The current Linux code is bigger while being faster, but this is of + * no real benefit when the bottleneck largely remains the JTAG link. ] + * + * Copyright (C) 2000-2004 Steven J. Hill (sjhill at realitydiluted.com) + * Toshiba America Electronics Components, Inc. + * + * Copyright (C) 2006 Thomas Gleixner + * + * This file is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 or (at your option) any + * later version. + * + * This file is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this file; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * As a special exception, if other files instantiate templates or use + * macros or inline functions from these files, or you compile these + * files and link them with other works to produce a work based on these + * files, these files do not by themselves cause the resulting work to be + * covered by the GNU General Public License. However the source code for + * these files must still be made available in accordance with section (3) + * of the GNU General Public License. + * + * This exception does not invalidate any other reasons why a work based on + * this file might be covered by the GNU General Public License. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include + +/* + * Pre-calculated 256-way 1 byte column parity + */ +static const uint8_t nand_ecc_precalc_table[] = { + 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00, + 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, + 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, + 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, + 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, + 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, + 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, + 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, + 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, + 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, + 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, + 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, + 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, + 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, + 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, + 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00 +}; + +/* + * nand_calculate_ecc - Calculate 3-byte ECC for 256-byte block + */ +int nand_calculate_ecc(struct nand_device *nand, const uint8_t *dat, uint8_t *ecc_code) +{ + uint8_t idx, reg1, reg2, reg3, tmp1, tmp2; + int i; + + /* Initialize variables */ + reg1 = reg2 = reg3 = 0; + + /* Build up column parity */ + for (i = 0; i < 256; i++) { + /* Get CP0 - CP5 from table */ + idx = nand_ecc_precalc_table[*dat++]; + reg1 ^= (idx & 0x3f); + + /* All bit XOR = 1 ? */ + if (idx & 0x40) { + reg3 ^= (uint8_t) i; + reg2 ^= ~((uint8_t) i); + } + } + + /* Create non-inverted ECC code from line parity */ + tmp1 = (reg3 & 0x80) >> 0; /* B7 -> B7 */ + tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */ + tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */ + tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */ + tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */ + tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */ + tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */ + tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */ + + tmp2 = (reg3 & 0x08) << 4; /* B3 -> B7 */ + tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */ + tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */ + tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */ + tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */ + tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */ + tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */ + tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */ + + /* Calculate final ECC code */ +#ifdef NAND_ECC_SMC + ecc_code[0] = ~tmp2; + ecc_code[1] = ~tmp1; +#else + ecc_code[0] = ~tmp1; + ecc_code[1] = ~tmp2; +#endif + ecc_code[2] = ((~reg1) << 2) | 0x03; + + return 0; +} diff --git a/src/flash/nand/ecc_kw.c b/src/flash/nand/ecc_kw.c new file mode 100644 index 00000000..55273c58 --- /dev/null +++ b/src/flash/nand/ecc_kw.c @@ -0,0 +1,172 @@ +/* + * Reed-Solomon ECC handling for the Marvell Kirkwood SOC + * Copyright (C) 2009 Marvell Semiconductor, Inc. + * + * Authors: Lennert Buytenhek + * Nicolas Pitre + * + * This file is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 or (at your option) any + * later version. + * + * This file is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include + +/***************************************************************************** + * Arithmetic in GF(2^10) ("F") modulo x^10 + x^3 + 1. + * + * For multiplication, a discrete log/exponent table is used, with + * primitive element x (F is a primitive field, so x is primitive). + */ +#define MODPOLY 0x409 /* x^10 + x^3 + 1 in binary */ + +/* + * Maps an integer a [0..1022] to a polynomial b = gf_exp[a] in + * GF(2^10) mod x^10 + x^3 + 1 such that b = x ^ a. There's two + * identical copies of this array back-to-back so that we can save + * the mod 1023 operation when doing a GF multiplication. + */ +static uint16_t gf_exp[1023 + 1023]; + +/* + * Maps a polynomial b in GF(2^10) mod x^10 + x^3 + 1 to an index + * a = gf_log[b] in [0..1022] such that b = x ^ a. + */ +static uint16_t gf_log[1024]; + +static void gf_build_log_exp_table(void) +{ + int i; + int p_i; + + /* + * p_i = x ^ i + * + * Initialise to 1 for i = 0. + */ + p_i = 1; + + for (i = 0; i < 1023; i++) { + gf_exp[i] = p_i; + gf_exp[i + 1023] = p_i; + gf_log[p_i] = i; + + /* + * p_i = p_i * x + */ + p_i <<= 1; + if (p_i & (1 << 10)) + p_i ^= MODPOLY; + } +} + + +/***************************************************************************** + * Reed-Solomon code + * + * This implements a (1023,1015) Reed-Solomon ECC code over GF(2^10) + * mod x^10 + x^3 + 1, shortened to (520,512). The ECC data consists + * of 8 10-bit symbols, or 10 8-bit bytes. + * + * Given 512 bytes of data, computes 10 bytes of ECC. + * + * This is done by converting the 512 bytes to 512 10-bit symbols + * (elements of F), interpreting those symbols as a polynomial in F[X] + * by taking symbol 0 as the coefficient of X^8 and symbol 511 as the + * coefficient of X^519, and calculating the residue of that polynomial + * divided by the generator polynomial, which gives us the 8 ECC symbols + * as the remainder. Finally, we convert the 8 10-bit ECC symbols to 10 + * 8-bit bytes. + * + * The generator polynomial is hardcoded, as that is faster, but it + * can be computed by taking the primitive element a = x (in F), and + * constructing a polynomial in F[X] with roots a, a^2, a^3, ..., a^8 + * by multiplying the minimal polynomials for those roots (which are + * just 'x - a^i' for each i). + * + * Note: due to unfortunate circumstances, the bootrom in the Kirkwood SOC + * expects the ECC to be computed backward, i.e. from the last byte down + * to the first one. + */ +int nand_calculate_ecc_kw(struct nand_device *nand, const uint8_t *data, uint8_t *ecc) +{ + unsigned int r7, r6, r5, r4, r3, r2, r1, r0; + int i; + static int tables_initialized = 0; + + if (!tables_initialized) { + gf_build_log_exp_table(); + tables_initialized = 1; + } + + /* + * Load bytes 504..511 of the data into r. + */ + r0 = data[504]; + r1 = data[505]; + r2 = data[506]; + r3 = data[507]; + r4 = data[508]; + r5 = data[509]; + r6 = data[510]; + r7 = data[511]; + + + /* + * Shift bytes 503..0 (in that order) into r0, followed + * by eight zero bytes, while reducing the polynomial by the + * generator polynomial in every step. + */ + for (i = 503; i >= -8; i--) { + unsigned int d; + + d = 0; + if (i >= 0) + d = data[i]; + + if (r7) { + uint16_t *t = gf_exp + gf_log[r7]; + + r7 = r6 ^ t[0x21c]; + r6 = r5 ^ t[0x181]; + r5 = r4 ^ t[0x18e]; + r4 = r3 ^ t[0x25f]; + r3 = r2 ^ t[0x197]; + r2 = r1 ^ t[0x193]; + r1 = r0 ^ t[0x237]; + r0 = d ^ t[0x024]; + } else { + r7 = r6; + r6 = r5; + r5 = r4; + r4 = r3; + r3 = r2; + r2 = r1; + r1 = r0; + r0 = d; + } + } + + ecc[0] = r0; + ecc[1] = (r0 >> 8) | (r1 << 2); + ecc[2] = (r1 >> 6) | (r2 << 4); + ecc[3] = (r2 >> 4) | (r3 << 6); + ecc[4] = (r3 >> 2); + ecc[5] = r4; + ecc[6] = (r4 >> 8) | (r5 << 2); + ecc[7] = (r5 >> 6) | (r6 << 4); + ecc[8] = (r6 >> 4) | (r7 << 6); + ecc[9] = (r7 >> 2); + + return 0; +} diff --git a/src/flash/nand/orion.c b/src/flash/nand/orion.c index b124deee..4b174da3 100644 --- a/src/flash/nand/orion.c +++ b/src/flash/nand/orion.c @@ -26,7 +26,7 @@ #include "config.h" #endif -#include +#include "arm_io.h" #include diff --git a/src/flash/nand_ecc.c b/src/flash/nand_ecc.c deleted file mode 100644 index 7aa1519d..00000000 --- a/src/flash/nand_ecc.c +++ /dev/null @@ -1,122 +0,0 @@ -/* - * This file contains an ECC algorithm from Toshiba that allows for detection - * and correction of 1-bit errors in a 256 byte block of data. - * - * [ Extracted from the initial code found in some early Linux versions. - * The current Linux code is bigger while being faster, but this is of - * no real benefit when the bottleneck largely remains the JTAG link. ] - * - * Copyright (C) 2000-2004 Steven J. Hill (sjhill at realitydiluted.com) - * Toshiba America Electronics Components, Inc. - * - * Copyright (C) 2006 Thomas Gleixner - * - * This file is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 or (at your option) any - * later version. - * - * This file is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License along - * with this file; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * - * As a special exception, if other files instantiate templates or use - * macros or inline functions from these files, or you compile these - * files and link them with other works to produce a work based on these - * files, these files do not by themselves cause the resulting work to be - * covered by the GNU General Public License. However the source code for - * these files must still be made available in accordance with section (3) - * of the GNU General Public License. - * - * This exception does not invalidate any other reasons why a work based on - * this file might be covered by the GNU General Public License. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "nand.h" - -/* - * Pre-calculated 256-way 1 byte column parity - */ -static const uint8_t nand_ecc_precalc_table[] = { - 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00, - 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, - 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, - 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, - 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, - 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, - 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, - 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, - 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, - 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, - 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, - 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, - 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, - 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, - 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, - 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00 -}; - -/* - * nand_calculate_ecc - Calculate 3-byte ECC for 256-byte block - */ -int nand_calculate_ecc(struct nand_device *nand, const uint8_t *dat, uint8_t *ecc_code) -{ - uint8_t idx, reg1, reg2, reg3, tmp1, tmp2; - int i; - - /* Initialize variables */ - reg1 = reg2 = reg3 = 0; - - /* Build up column parity */ - for (i = 0; i < 256; i++) { - /* Get CP0 - CP5 from table */ - idx = nand_ecc_precalc_table[*dat++]; - reg1 ^= (idx & 0x3f); - - /* All bit XOR = 1 ? */ - if (idx & 0x40) { - reg3 ^= (uint8_t) i; - reg2 ^= ~((uint8_t) i); - } - } - - /* Create non-inverted ECC code from line parity */ - tmp1 = (reg3 & 0x80) >> 0; /* B7 -> B7 */ - tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */ - tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */ - tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */ - tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */ - tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */ - tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */ - tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */ - - tmp2 = (reg3 & 0x08) << 4; /* B3 -> B7 */ - tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */ - tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */ - tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */ - tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */ - tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */ - tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */ - tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */ - - /* Calculate final ECC code */ -#ifdef NAND_ECC_SMC - ecc_code[0] = ~tmp2; - ecc_code[1] = ~tmp1; -#else - ecc_code[0] = ~tmp1; - ecc_code[1] = ~tmp2; -#endif - ecc_code[2] = ((~reg1) << 2) | 0x03; - - return 0; -} diff --git a/src/flash/nand_ecc_kw.c b/src/flash/nand_ecc_kw.c deleted file mode 100644 index a809b322..00000000 --- a/src/flash/nand_ecc_kw.c +++ /dev/null @@ -1,174 +0,0 @@ -/* - * Reed-Solomon ECC handling for the Marvell Kirkwood SOC - * Copyright (C) 2009 Marvell Semiconductor, Inc. - * - * Authors: Lennert Buytenhek - * Nicolas Pitre - * - * This file is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 or (at your option) any - * later version. - * - * This file is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include -#include "nand.h" - - -/***************************************************************************** - * Arithmetic in GF(2^10) ("F") modulo x^10 + x^3 + 1. - * - * For multiplication, a discrete log/exponent table is used, with - * primitive element x (F is a primitive field, so x is primitive). - */ -#define MODPOLY 0x409 /* x^10 + x^3 + 1 in binary */ - -/* - * Maps an integer a [0..1022] to a polynomial b = gf_exp[a] in - * GF(2^10) mod x^10 + x^3 + 1 such that b = x ^ a. There's two - * identical copies of this array back-to-back so that we can save - * the mod 1023 operation when doing a GF multiplication. - */ -static uint16_t gf_exp[1023 + 1023]; - -/* - * Maps a polynomial b in GF(2^10) mod x^10 + x^3 + 1 to an index - * a = gf_log[b] in [0..1022] such that b = x ^ a. - */ -static uint16_t gf_log[1024]; - -static void gf_build_log_exp_table(void) -{ - int i; - int p_i; - - /* - * p_i = x ^ i - * - * Initialise to 1 for i = 0. - */ - p_i = 1; - - for (i = 0; i < 1023; i++) { - gf_exp[i] = p_i; - gf_exp[i + 1023] = p_i; - gf_log[p_i] = i; - - /* - * p_i = p_i * x - */ - p_i <<= 1; - if (p_i & (1 << 10)) - p_i ^= MODPOLY; - } -} - - -/***************************************************************************** - * Reed-Solomon code - * - * This implements a (1023,1015) Reed-Solomon ECC code over GF(2^10) - * mod x^10 + x^3 + 1, shortened to (520,512). The ECC data consists - * of 8 10-bit symbols, or 10 8-bit bytes. - * - * Given 512 bytes of data, computes 10 bytes of ECC. - * - * This is done by converting the 512 bytes to 512 10-bit symbols - * (elements of F), interpreting those symbols as a polynomial in F[X] - * by taking symbol 0 as the coefficient of X^8 and symbol 511 as the - * coefficient of X^519, and calculating the residue of that polynomial - * divided by the generator polynomial, which gives us the 8 ECC symbols - * as the remainder. Finally, we convert the 8 10-bit ECC symbols to 10 - * 8-bit bytes. - * - * The generator polynomial is hardcoded, as that is faster, but it - * can be computed by taking the primitive element a = x (in F), and - * constructing a polynomial in F[X] with roots a, a^2, a^3, ..., a^8 - * by multiplying the minimal polynomials for those roots (which are - * just 'x - a^i' for each i). - * - * Note: due to unfortunate circumstances, the bootrom in the Kirkwood SOC - * expects the ECC to be computed backward, i.e. from the last byte down - * to the first one. - */ -int nand_calculate_ecc_kw(struct nand_device *nand, const uint8_t *data, uint8_t *ecc) -{ - unsigned int r7, r6, r5, r4, r3, r2, r1, r0; - int i; - static int tables_initialized = 0; - - if (!tables_initialized) { - gf_build_log_exp_table(); - tables_initialized = 1; - } - - /* - * Load bytes 504..511 of the data into r. - */ - r0 = data[504]; - r1 = data[505]; - r2 = data[506]; - r3 = data[507]; - r4 = data[508]; - r5 = data[509]; - r6 = data[510]; - r7 = data[511]; - - - /* - * Shift bytes 503..0 (in that order) into r0, followed - * by eight zero bytes, while reducing the polynomial by the - * generator polynomial in every step. - */ - for (i = 503; i >= -8; i--) { - unsigned int d; - - d = 0; - if (i >= 0) - d = data[i]; - - if (r7) { - uint16_t *t = gf_exp + gf_log[r7]; - - r7 = r6 ^ t[0x21c]; - r6 = r5 ^ t[0x181]; - r5 = r4 ^ t[0x18e]; - r4 = r3 ^ t[0x25f]; - r3 = r2 ^ t[0x197]; - r2 = r1 ^ t[0x193]; - r1 = r0 ^ t[0x237]; - r0 = d ^ t[0x024]; - } else { - r7 = r6; - r6 = r5; - r5 = r4; - r4 = r3; - r3 = r2; - r2 = r1; - r1 = r0; - r0 = d; - } - } - - ecc[0] = r0; - ecc[1] = (r0 >> 8) | (r1 << 2); - ecc[2] = (r1 >> 6) | (r2 << 4); - ecc[3] = (r2 >> 4) | (r3 << 6); - ecc[4] = (r3 >> 2); - ecc[5] = r4; - ecc[6] = (r4 >> 8) | (r5 << 2); - ecc[7] = (r5 >> 6) | (r6 << 4); - ecc[8] = (r6 >> 4) | (r7 << 6); - ecc[9] = (r7 >> 2); - - return 0; -} -- cgit v1.2.3