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mtd: spi-nor: parse SFDP 4-byte Address Instruction Table

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Add support for SFDP (JESD216B) 4-byte Address Instruction Table. This
table is optional but when available, we parse it to get the 4-byte
address op codes supported by the memory.
Using these op codes is stateless as opposed to entering the 4-byte
address mode or setting the Base Address Register (BAR).

Flashes that have the 4BAIT table declared can now support
SPINOR_OP_PP_1_1_4_4B and SPINOR_OP_PP_1_4_4_4B opcodes.

Tested on MX25L25673G.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@microchip.com>
[tudor.ambarus@microchip.com:
- rework erase and page program logic,
- pass DMA-able buffer to spi_nor_read_sfdp(),
- introduce SPI_NOR_HAS_4BAIT
- various minor updates.]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Cyrille Pitchen 2018-12-06 14:43:39 +00:00 committed by Boris Brezillon
parent d05e21e3cf
commit 816873eaee
2 changed files with 193 additions and 1 deletions
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193
drivers/mtd/spi-nor/spi-nor.c
View File

@ -121,6 +121,7 @@ struct sfdp_parameter_header {
#define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
#define SFDP_4BAIT_ID 0xff84 /* 4-byte Address Instruction Table */
#define SFDP_SIGNATURE 0x50444653U
#define SFDP_JESD216_MAJOR 1
@ -3239,6 +3240,191 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
return ret;
}
#define SFDP_4BAIT_DWORD_MAX 2
struct sfdp_4bait {
/* The hardware capability. */
u32 hwcaps;
/*
* The <supported_bit> bit in DWORD1 of the 4BAIT tells us whether
* the associated 4-byte address op code is supported.
*/
u32 supported_bit;
};
/**
* spi_nor_parse_4bait() - parse the 4-Byte Address Instruction Table
* @nor: pointer to a 'struct spi_nor'.
* @param_header: pointer to the 'struct sfdp_parameter_header' describing
* the 4-Byte Address Instruction Table length and version.
* @params: pointer to the 'struct spi_nor_flash_parameter' to be.
*
* Return: 0 on success, -errno otherwise.
*/
static int spi_nor_parse_4bait(struct spi_nor *nor,
const struct sfdp_parameter_header *param_header,
struct spi_nor_flash_parameter *params)
{
static const struct sfdp_4bait reads[] = {
{ SNOR_HWCAPS_READ, BIT(0) },
{ SNOR_HWCAPS_READ_FAST, BIT(1) },
{ SNOR_HWCAPS_READ_1_1_2, BIT(2) },
{ SNOR_HWCAPS_READ_1_2_2, BIT(3) },
{ SNOR_HWCAPS_READ_1_1_4, BIT(4) },
{ SNOR_HWCAPS_READ_1_4_4, BIT(5) },
{ SNOR_HWCAPS_READ_1_1_1_DTR, BIT(13) },
{ SNOR_HWCAPS_READ_1_2_2_DTR, BIT(14) },
{ SNOR_HWCAPS_READ_1_4_4_DTR, BIT(15) },
};
static const struct sfdp_4bait programs[] = {
{ SNOR_HWCAPS_PP, BIT(6) },
{ SNOR_HWCAPS_PP_1_1_4, BIT(7) },
{ SNOR_HWCAPS_PP_1_4_4, BIT(8) },
};
static const struct sfdp_4bait erases[SNOR_ERASE_TYPE_MAX] = {
{ 0u /* not used */, BIT(9) },
{ 0u /* not used */, BIT(10) },
{ 0u /* not used */, BIT(11) },
{ 0u /* not used */, BIT(12) },
};
struct spi_nor_pp_command *params_pp = params->page_programs;
struct spi_nor_erase_map *map = &nor->erase_map;
struct spi_nor_erase_type *erase_type = map->erase_type;
u32 *dwords;
size_t len;
u32 addr, discard_hwcaps, read_hwcaps, pp_hwcaps, erase_mask;
int i, ret;
if (param_header->major != SFDP_JESD216_MAJOR ||
param_header->length < SFDP_4BAIT_DWORD_MAX)
return -EINVAL;
/* Read the 4-byte Address Instruction Table. */
len = sizeof(*dwords) * SFDP_4BAIT_DWORD_MAX;
/* Use a kmalloc'ed bounce buffer to guarantee it is DMA-able. */
dwords = kmalloc(len, GFP_KERNEL);
if (!dwords)
return -ENOMEM;
addr = SFDP_PARAM_HEADER_PTP(param_header);
ret = spi_nor_read_sfdp(nor, addr, len, dwords);
if (ret)
return ret;
/* Fix endianness of the 4BAIT DWORDs. */
for (i = 0; i < SFDP_4BAIT_DWORD_MAX; i++)
dwords[i] = le32_to_cpu(dwords[i]);
/*
* Compute the subset of (Fast) Read commands for which the 4-byte
* version is supported.
*/
discard_hwcaps = 0;
read_hwcaps = 0;
for (i = 0; i < ARRAY_SIZE(reads); i++) {
const struct sfdp_4bait *read = &reads[i];
discard_hwcaps |= read->hwcaps;
if ((params->hwcaps.mask & read->hwcaps) &&
(dwords[0] & read->supported_bit))
read_hwcaps |= read->hwcaps;
}
/*
* Compute the subset of Page Program commands for which the 4-byte
* version is supported.
*/
pp_hwcaps = 0;
for (i = 0; i < ARRAY_SIZE(programs); i++) {
const struct sfdp_4bait *program = &programs[i];
/*
* The 4 Byte Address Instruction (Optional) Table is the only
* SFDP table that indicates support for Page Program Commands.
* Bypass the params->hwcaps.mask and consider 4BAIT the biggest
* authority for specifying Page Program support.
*/
discard_hwcaps |= program->hwcaps;
if (dwords[0] & program->supported_bit)
pp_hwcaps |= program->hwcaps;
}
/*
* Compute the subset of Sector Erase commands for which the 4-byte
* version is supported.
*/
erase_mask = 0;
for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
const struct sfdp_4bait *erase = &erases[i];
if (dwords[0] & erase->supported_bit)
erase_mask |= BIT(i);
}
/* Replicate the sort done for the map's erase types in BFPT. */
erase_mask = spi_nor_sort_erase_mask(map, erase_mask);
/*
* We need at least one 4-byte op code per read, program and erase
* operation; the .read(), .write() and .erase() hooks share the
* nor->addr_width value.
*/
if (!read_hwcaps || !pp_hwcaps || !erase_mask)
goto out;
/*
* Discard all operations from the 4-byte instruction set which are
* not supported by this memory.
*/
params->hwcaps.mask &= ~discard_hwcaps;
params->hwcaps.mask |= (read_hwcaps | pp_hwcaps);
/* Use the 4-byte address instruction set. */
for (i = 0; i < SNOR_CMD_READ_MAX; i++) {
struct spi_nor_read_command *read_cmd = &params->reads[i];
read_cmd->opcode = spi_nor_convert_3to4_read(read_cmd->opcode);
}
/* 4BAIT is the only SFDP table that indicates page program support. */
if (pp_hwcaps & SNOR_HWCAPS_PP)
spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP],
SPINOR_OP_PP_4B, SNOR_PROTO_1_1_1);
if (pp_hwcaps & SNOR_HWCAPS_PP_1_1_4)
spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_1_4],
SPINOR_OP_PP_1_1_4_4B,
SNOR_PROTO_1_1_4);
if (pp_hwcaps & SNOR_HWCAPS_PP_1_4_4)
spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_4_4],
SPINOR_OP_PP_1_4_4_4B,
SNOR_PROTO_1_4_4);
for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
if (erase_mask & BIT(i))
erase_type[i].opcode = (dwords[1] >>
erase_type[i].idx * 8) & 0xFF;
else
spi_nor_set_erase_type(&erase_type[i], 0u, 0xFF);
}
/*
* We set SNOR_F_HAS_4BAIT in order to skip spi_nor_set_4byte_opcodes()
* later because we already did the conversion to 4byte opcodes. Also,
* this latest function implements a legacy quirk for the erase size of
* Spansion memory. However this quirk is no longer needed with new
* SFDP compliant memories.
*/
nor->addr_width = 4;
nor->flags |= SNOR_F_4B_OPCODES | SNOR_F_HAS_4BAIT;
/* fall through */
out:
kfree(dwords);
return ret;
}
/**
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
* @nor: pointer to a 'struct spi_nor'
@ -3336,6 +3522,10 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
err = spi_nor_parse_smpt(nor, param_header);
break;
case SFDP_4BAIT_ID:
err = spi_nor_parse_4bait(nor, param_header, params);
break;
default:
break;
}
@ -3925,7 +4115,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
(JEDEC_MFR(info) == SNOR_MFR_SPANSION && mtd->size > SZ_16M))
nor->flags |= SNOR_F_4B_OPCODES;
if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES)
if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
!(nor->flags & SNOR_F_HAS_4BAIT))
spi_nor_set_4byte_opcodes(nor);
if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {

1
include/linux/mtd/spi-nor.h
View File

@ -234,6 +234,7 @@ enum spi_nor_option_flags {
SNOR_F_USE_CLSR = BIT(5),
SNOR_F_BROKEN_RESET = BIT(6),
SNOR_F_4B_OPCODES = BIT(7),
SNOR_F_HAS_4BAIT = BIT(8),
};
/**