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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2019 by Andreas Bolsch <andreas.bolsch@mni.thm.de *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "imp.h"
#include "spi.h"
#include "sfdp.h"
#define SFDP_ACCESS_PROT 0xFF
#define SFDP_BASIC_FLASH 0xFF00
#define SFDP_4BYTE_ADDR 0xFF84
static const char *sfdp_name = "sfdp";
struct sfdp_hdr {
uint32_t signature;
uint32_t revision;
};
struct sfdp_phdr {
uint32_t revision;
uint32_t ptr;
};
struct sfdp_basic_flash_param {
uint32_t fast_addr; /* 01: fast read and 3/4 address bytes */
uint32_t density; /* 02: memory density */
uint32_t fast_1x4; /* 03: 1-1-4 and 1-4-4 fast read */
uint32_t fast_1x2; /* 04: 1-2-2 and 1-1-2 fast read */
uint32_t fast_444; /* 05: 4-4-4 and 2-2-2 fast read */
uint32_t read_222; /* 06: 2-2-2 fast read instr and dummy */
uint32_t read_444; /* 07: 4-4-4 fast read instr and dummy */
uint32_t erase_t12; /* 08: erase types 1, 2 */
uint32_t erase_t34; /* 09: erase types 3, 4 */
uint32_t erase_time; /* 10: erase times for types 1 - 4 */
uint32_t chip_byte; /* 11: chip erase time, byte prog time, page prog */
uint32_t susp_time; /* 12: suspend and resume times */
uint32_t susp_instr; /* 13: suspend and resume instr */
uint32_t pwrd_instr; /* 14: powerdown instr */
uint32_t quad_req; /* 15: quad enable requirements */
uint32_t addr_reset; /* 16: 3-/4-byte addressing and reset */
uint32_t read_1x8; /* 17: 1-1-8 and 1-8-8 fast read instr and dummy */
uint32_t dtr_drive; /* 18: dtr modes and drive strength */
uint32_t octal_req; /* 19: octal enable requirements */
uint32_t speed_888; /* 20: speed in 8-8-8 modes */
};
struct sfdp_4byte_addr_param {
uint32_t flags; /* 01: various flags */
uint32_t erase_t1234; /* 02: erase commands */
};
/* Try to get parameters from flash via SFDP */
int spi_sfdp(struct flash_bank *bank, struct flash_device *dev,
read_sfdp_block_t read_sfdp_block)
{
struct sfdp_hdr header;
struct sfdp_phdr *pheaders = NULL;
uint32_t *ptable = NULL;
unsigned int j, k, nph;
int retval, erase_type = 0;
memset(dev, 0, sizeof(struct flash_device));
/* retrieve SFDP header */
memset(&header, 0, sizeof(header));
retval = read_sfdp_block(bank, 0x0, sizeof(header) >> 2, (uint32_t *)&header);
if (retval != ERROR_OK)
return retval;
LOG_DEBUG("header 0x%08" PRIx32 " 0x%08" PRIx32, header.signature, header.revision);
if (header.signature != SFDP_MAGIC) {
LOG_INFO("no SDFP found");
return ERROR_FLASH_BANK_NOT_PROBED;
}
if (((header.revision >> 24) & 0xFF) != SFDP_ACCESS_PROT) {
LOG_ERROR("access protocol 0x%02x not implemented",
(header.revision >> 24) & 0xFFU);
return ERROR_FLASH_BANK_NOT_PROBED;
}
/* retrieve table of parameter headers */
nph = ((header.revision >> 16) & 0xFF) + 1;
LOG_DEBUG("parameter headers: %d", nph);
pheaders = malloc(sizeof(struct sfdp_phdr) * nph);
if (!pheaders) {
LOG_ERROR("not enough memory");
return ERROR_FAIL;
}
memset(pheaders, 0, sizeof(struct sfdp_phdr) * nph);
retval = read_sfdp_block(bank, sizeof(header),
(sizeof(struct sfdp_phdr) >> 2) * nph, (uint32_t *)pheaders);
if (retval != ERROR_OK)
goto err;
for (k = 0; k < nph; k++) {
unsigned int words = (pheaders[k].revision >> 24) & 0xFF;
uint16_t id = (((pheaders[k].ptr) >> 16) & 0xFF00) | (pheaders[k].revision & 0xFF);
uint32_t ptr = pheaders[k].ptr & 0xFFFFFF;
LOG_DEBUG("pheader %d len=0x%02" PRIx8 " id=0x%04" PRIx16
" ptr=0x%06" PRIx32, k, words, id, ptr);
/* retrieve parameter table */
ptable = malloc(words << 2);
if (!ptable) {
LOG_ERROR("not enough memory");
retval = ERROR_FAIL;
goto err;
}
retval = read_sfdp_block(bank, ptr, words, ptable);
if (retval != ERROR_OK)
goto err;
for (j = 0; j < words; j++)
LOG_DEBUG("word %02d 0x%08X", j + 1, ptable[j]);
if (id == SFDP_BASIC_FLASH) {
struct sfdp_basic_flash_param *table = (struct sfdp_basic_flash_param *)ptable;
uint16_t erase;
if (words < 9) {
LOG_ERROR("id=0x%04" PRIx16 " invalid length %d", id, words);
retval = ERROR_FLASH_BANK_NOT_PROBED;
goto err;
}
LOG_DEBUG("basic flash parameter table");
/* dummy device name */
dev->name = sfdp_name;
/* default instructions */
dev->read_cmd = SPIFLASH_READ;
dev->pprog_cmd = SPIFLASH_PAGE_PROGRAM;
dev->chip_erase_cmd = SPIFLASH_MASS_ERASE;
/* get device size */
if (table->density & (1UL << 31))
dev->size_in_bytes = 1UL << ((table->density & ~(1UL << 31)) - 3);
else
dev->size_in_bytes = (table->density + 1) >> 3;
/* 2-2-2 read instruction, not used */
if (table->fast_444 & (1UL << 0))
dev->qread_cmd = (table->read_222 >> 24) & 0xFF;
/* 4-4-4 read instruction */
if (table->fast_444 & (1UL << 4))
dev->qread_cmd = (table->read_444 >> 24) & 0xFF;
/* find the largest erase block size and instruction */
erase = (table->erase_t12 >> 0) & 0xFFFF;
erase_type = 1;
if (((table->erase_t12 >> 16) & 0xFF) > (erase & 0xFF)) {
erase = (table->erase_t12 >> 16) & 0xFFFF;
erase_type = 2;
}
if (((table->erase_t34 >> 0) & 0xFF) > (erase & 0xFF)) {
erase = (table->erase_t34 >> 0) & 0xFFFF;
erase_type = 3;
}
if (((table->erase_t34 >> 16) & 0xFF) > (erase & 0xFF)) {
erase = (table->erase_t34 >> 16) & 0xFFFF;
erase_type = 4;
}
dev->erase_cmd = (erase >> 8) & 0xFF;
dev->sectorsize = 1UL << (erase & 0xFF);
if ((offsetof(struct sfdp_basic_flash_param, chip_byte) >> 2) < words) {
/* get Program Page Size, if chip_byte present, that's optional */
dev->pagesize = 1UL << ((table->chip_byte >> 4) & 0x0F);
} else {
/* no explicit page size specified ... */
if (table->fast_addr & (1UL << 2)) {
/* Write Granularity = 1, use 64 bytes */
dev->pagesize = 1UL << 6;
} else {
/* Write Granularity = 0, use 16 bytes */
dev->pagesize = 1UL << 4;
}
}
if (dev->size_in_bytes > (1UL << 24)) {
if (((table->fast_addr >> 17) & 0x3) == 0x0)
LOG_ERROR("device needs paging - not implemented");
/* 4-byte addresses needed if more than 16 MBytes */
if (((offsetof(struct sfdp_basic_flash_param, addr_reset) >> 2) < words) &&
(table->addr_reset & (1UL << 29))) {
/* dedicated 4-byte-address instructions, hopefully these ...
* this entry is unfortunately optional as well
* a subsequent 4-byte address table may overwrite this */
dev->read_cmd = 0x13;
dev->pprog_cmd = 0x12;
dev->erase_cmd = 0xDC;
if (dev->qread_cmd != 0)
dev->qread_cmd = 0xEC;
} else if (((table->fast_addr >> 17) & 0x3) == 0x1)
LOG_INFO("device has to be switched to 4-byte addresses");
}
} else if (id == SFDP_4BYTE_ADDR) {
struct sfdp_4byte_addr_param *table = (struct sfdp_4byte_addr_param *)ptable;
if (words >= (offsetof(struct sfdp_4byte_addr_param, erase_t1234)
+ sizeof(table->erase_t1234)) >> 2) {
LOG_INFO("4-byte address parameter table");
/* read and page program instructions */
if (table->flags & (1UL << 0))
dev->read_cmd = 0x13;
if (table->flags & (1UL << 5))
dev->qread_cmd = 0xEC;
if (table->flags & (1UL << 6))
dev->pprog_cmd = 0x12;
/* erase instructions */
if ((erase_type == 1) && (table->flags & (1UL << 9)))
dev->erase_cmd = (table->erase_t1234 >> 0) & 0xFF;
else if ((erase_type == 2) && (table->flags & (1UL << 10)))
dev->erase_cmd = (table->erase_t1234 >> 8) & 0xFF;
else if ((erase_type == 3) && (table->flags & (1UL << 11)))
dev->erase_cmd = (table->erase_t1234 >> 16) & 0xFF;
else if ((erase_type == 4) && (table->flags & (1UL << 12)))
dev->erase_cmd = (table->erase_t1234 >> 24) & 0xFF;
} else
LOG_ERROR("parameter table id=0x%04" PRIx16 " invalid length %d", id, words);
} else
LOG_DEBUG("unimplemented parameter table id=0x%04" PRIx16, id);
free(ptable);
ptable = NULL;
}
if (erase_type != 0) {
LOG_INFO("valid SFDP detected");
retval = ERROR_OK;
} else {
LOG_ERROR("incomplete/invalid SFDP");
retval = ERROR_FLASH_BANK_NOT_PROBED;
}
err:
free(pheaders);
free(ptable);
return retval;
}