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linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 9/30/20 9:57 PM, Pratyush Yadav wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > This table is indication that the flash is xSPI compliant and hence > supports octal DTR mode. Extract information like the fast read opcode, > dummy cycles, the number of dummy cycles needed for a Read Status > Register command, and the number of address bytes needed for a Read > Status Register command. > > We don't know what speed the controller is running at. Find the fast > read dummy cycles for the fastest frequency the flash can run at to be > sure we are never short of dummy cycles. If nothing is available, > default to 20. Flashes that use a different value should update it in > their fixup hooks. > > Since we want to set read settings, expose spi_nor_set_read_settings() > in core.h. > > Signed-off-by: Pratyush Yadav > --- > drivers/mtd/spi-nor/core.c | 2 +- > drivers/mtd/spi-nor/core.h | 10 +++++ > drivers/mtd/spi-nor/sfdp.c | 91 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 102 insertions(+), 1 deletion(-) > > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c > index beb17639dc92..97e82a4821f6 100644 > --- a/drivers/mtd/spi-nor/core.c > +++ b/drivers/mtd/spi-nor/core.c > @@ -2332,7 +2332,7 @@ static int spi_nor_check(struct spi_nor *nor) > return 0; > } > > -static void > +void > spi_nor_set_read_settings(struct spi_nor_read_command *read, > u8 num_mode_clocks, > u8 num_wait_states, > diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h > index 5d95b4183a33..9a33c8d07335 100644 > --- a/drivers/mtd/spi-nor/core.h > +++ b/drivers/mtd/spi-nor/core.h > @@ -192,6 +192,9 @@ struct spi_nor_locking_ops { > * > * @size: the flash memory density in bytes. > * @page_size: the page size of the SPI NOR flash memory. > + * @rdsr_dummy: dummy cycles needed for Read Status Register command. > + * @rdsr_addr_nbytes: dummy address bytes needed for Read Status Register > + * command. > * @hwcaps: describes the read and page program hardware > * capabilities. > * @reads: read capabilities ordered by priority: the higher index > @@ -214,6 +217,8 @@ struct spi_nor_locking_ops { > struct spi_nor_flash_parameter { > u64 size; > u32 page_size; > + u8 rdsr_dummy; > + u8 rdsr_addr_nbytes; > > struct spi_nor_hwcaps hwcaps; > struct spi_nor_read_command reads[SNOR_CMD_READ_MAX]; > @@ -425,6 +430,11 @@ ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len, > > int spi_nor_hwcaps_read2cmd(u32 hwcaps); > u8 spi_nor_convert_3to4_read(u8 opcode); > +void spi_nor_set_read_settings(struct spi_nor_read_command *read, > + u8 num_mode_clocks, > + u8 num_wait_states, > + u8 opcode, > + enum spi_nor_protocol proto); > void spi_nor_set_pp_settings(struct spi_nor_pp_command *pp, u8 opcode, > enum spi_nor_protocol proto); > > diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c > index c77655968f80..ebc1188f7533 100644 > --- a/drivers/mtd/spi-nor/sfdp.c > +++ b/drivers/mtd/spi-nor/sfdp.c > @@ -4,6 +4,7 @@ > * Copyright (C) 2014, Freescale Semiconductor, Inc. > */ > > +#include > #include > #include > #include > @@ -19,6 +20,7 @@ > #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_PROFILE1_ID 0xff05 /* xSPI Profile 1.0 table. */ > > #define SFDP_SIGNATURE 0x50444653U > > @@ -1108,6 +1110,91 @@ static int spi_nor_parse_4bait(struct spi_nor *nor, > return ret; > } > > +#define PROFILE1_DWORD1_RDSR_ADDR_BYTES BIT(29) > +#define PROFILE1_DWORD1_RDSR_DUMMY BIT(28) > +#define PROFILE1_DWORD1_RD_FAST_CMD GENMASK(15, 8) > +#define PROFILE1_DWORD4_DUMMY_200MHZ GENMASK(11, 7) > +#define PROFILE1_DWORD5_DUMMY_166MHZ GENMASK(31, 27) > +#define PROFILE1_DWORD5_DUMMY_133MHZ GENMASK(21, 17) > +#define PROFILE1_DWORD5_DUMMY_100MHZ GENMASK(11, 7) > + > +/** > + * spi_nor_parse_profile1() - parse the xSPI Profile 1.0 table > + * @nor: pointer to a 'struct spi_nor' > + * @profile1_header: pointer to the 'struct sfdp_parameter_header' describing > + * the Profile 1.0 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_profile1(struct spi_nor *nor, > + const struct sfdp_parameter_header *profile1_header, > + struct spi_nor_flash_parameter *params) > +{ > + u32 *dwords, addr; > + size_t len; > + int ret; > + u8 dummy = 0, opcode; explicit init to 0 not needed. With this addressed, one can add: Reviewed-by: Tudor Ambarus > + > + len = profile1_header->length * sizeof(*dwords); > + dwords = kmalloc(len, GFP_KERNEL); > + if (!dwords) > + return -ENOMEM; > + > + addr = SFDP_PARAM_HEADER_PTP(profile1_header); > + ret = spi_nor_read_sfdp(nor, addr, len, dwords); > + if (ret) > + goto out; > + > + le32_to_cpu_array(dwords, profile1_header->length); > + > + /* Get 8D-8D-8D fast read opcode and dummy cycles. */ > + opcode = FIELD_GET(PROFILE1_DWORD1_RD_FAST_CMD, dwords[0]); > + > + /* Set the Read Status Register dummy cycles and dummy address bytes. */ > + if (dwords[0] & PROFILE1_DWORD1_RDSR_DUMMY) > + params->rdsr_dummy = 8; > + else > + params->rdsr_dummy = 4; > + > + if (dwords[0] & PROFILE1_DWORD1_RDSR_ADDR_BYTES) > + params->rdsr_addr_nbytes = 4; > + else > + params->rdsr_addr_nbytes = 0; > + > + /* > + * We don't know what speed the controller is running at. Find the > + * dummy cycles for the fastest frequency the flash can run at to be > + * sure we are never short of dummy cycles. A value of 0 means the > + * frequency is not supported. > + * > + * Default to PROFILE1_DUMMY_DEFAULT if we don't find anything, and let > + * flashes set the correct value if needed in their fixup hooks. > + */ > + dummy = FIELD_GET(PROFILE1_DWORD4_DUMMY_200MHZ, dwords[3]); > + if (!dummy) > + dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_166MHZ, dwords[4]); > + if (!dummy) > + dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_133MHZ, dwords[4]); > + if (!dummy) > + dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_100MHZ, dwords[4]); > + if (!dummy) > + dev_dbg(nor->dev, > + "Can't find dummy cycles from Profile 1.0 table\n"); > + > + /* Round up to an even value to avoid tripping controllers up. */ > + dummy = round_up(dummy, 2); > + > + /* Update the fast read settings. */ > + spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_8_8_8_DTR], > + 0, dummy, opcode, > + SNOR_PROTO_8_8_8_DTR); > + > +out: > + kfree(dwords); > + return ret; > +} > + > /** > * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters. > * @nor: pointer to a 'struct spi_nor' > @@ -1209,6 +1296,10 @@ int spi_nor_parse_sfdp(struct spi_nor *nor, > err = spi_nor_parse_4bait(nor, param_header, params); > break; > > + case SFDP_PROFILE1_ID: > + err = spi_nor_parse_profile1(nor, param_header, params); > + break; > + > default: > break; > } > -- > 2.28.0 > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/