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SubjectRe: [PATCH 2/2] mtd: spi-nor: implement OTP support for Winbond flashes
Am 2020-01-09 00:36, schrieb Michael Walle:
> Use the new OTP ops to implement OTP access on Winbond flashes. Most
> Winbond flashes provides up to four different OTP areas ("Security
> Registers"). Newer flashes uses the first OTP area for SFDP data. Thus,
> this only handles the last three areas and leave the first untouched.
>
> This was tested on a Winbond W25Q32JW. Please note, that there is a
> variant of the W25Q32JW which reuses the same JEDEC ID as the W25Q32FW
> which could support all four OTP areas. But because we cannot
> distiguish
> between these two, the driver only uses three areas on the W25Q32FW.
>
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---
> drivers/mtd/spi-nor/spi-nor.c | 132 ++++++++++++++++++++++++++++++++++
> include/linux/mtd/spi-nor.h | 14 ++++
> 2 files changed, 146 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c
> b/drivers/mtd/spi-nor/spi-nor.c
> index 5eabaec70508..99d365cb63b1 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2641,17 +2641,20 @@ static const struct flash_info spi_nor_ids[] =
> {
> "w25q16dw", INFO(0xef6015, 0, 64 * 1024, 32,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q16jwim", INFO(0xef8015, 0, 64 * 1024, 32,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> { "w25x32", INFO(0xef3016, 0, 64 * 1024, 64, SECT_4K) },
> {
> "w25q16jv-im/jm", INFO(0xef7015, 0, 64 * 1024, 32,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> { "w25q20cl", INFO(0xef4012, 0, 64 * 1024, 4, SECT_4K) },
> { "w25q20bw", INFO(0xef5012, 0, 64 * 1024, 4, SECT_4K) },
> @@ -2661,16 +2664,19 @@ static const struct flash_info spi_nor_ids[] =
> {
> "w25q32dw", INFO(0xef6016, 0, 64 * 1024, 64,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q32jv", INFO(0xef7016, 0, 64 * 1024, 64,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q32jwim", INFO(0xef8016, 0, 64 * 1024, 64,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> { "w25x64", INFO(0xef3017, 0, 64 * 1024, 128, SECT_4K) },
> { "w25q64", INFO(0xef4017, 0, 64 * 1024, 128, SECT_4K) },
> @@ -2678,26 +2684,31 @@ static const struct flash_info spi_nor_ids[] =
> {
> "w25q64dw", INFO(0xef6017, 0, 64 * 1024, 128,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q64jwim", INFO(0xef8017, 0, 64 * 1024, 128,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q128fw", INFO(0xef6018, 0, 64 * 1024, 256,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q128jv", INFO(0xef7018, 0, 64 * 1024, 256,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> {
> "w25q128jwim", INFO(0xef8018, 0, 64 * 1024, 256,
> SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> + OTP_INFO(256, 3, 0x1000, 0x1000)
> },
> { "w25q80", INFO(0xef5014, 0, 64 * 1024, 16, SECT_4K) },
> { "w25q80bl", INFO(0xef4014, 0, 64 * 1024, 16, SECT_4K) },
> @@ -4645,6 +4656,125 @@ static int spi_nor_setup(struct spi_nor *nor,
> return nor->params.setup(nor, hwcaps);
> }
>
> +static int winbond_otp_read(struct spi_nor *nor, loff_t addr, uint64_t
> len,
> + u8 *buf)
> +{
> + u8 addr_width, read_opcode, read_dummy;
> + enum spi_nor_protocol read_proto;
> + int ret;
> +
> + read_opcode = nor->read_opcode;
> + addr_width = nor->addr_width;
> + read_dummy = nor->read_dummy;
> + read_proto = nor->read_proto;
> +
> + nor->read_opcode = SPINOR_OP_WB_RSECR;
> + nor->addr_width = 3;
> + nor->read_dummy = 8;
> + nor->read_proto = SNOR_PROTO_1_1_1;
> +
> + ret = spi_nor_read_raw(nor, addr, len, buf);
> +
> + nor->read_opcode = read_opcode;
> + nor->addr_width = addr_width;
> + nor->read_dummy = read_dummy;
> + nor->read_proto = read_proto;
> +
> + return ret;
> +}
> +
> +static int winbond_otp_write(struct spi_nor *nor, loff_t addr,
> uint64_t len,
> + u8 *buf)
> +{
> + u8 addr_width, program_opcode;
> + enum spi_nor_protocol write_proto;
> + int ret;
> +
> + program_opcode = nor->program_opcode;
> + addr_width = nor->addr_width;
> + write_proto = nor->write_proto;
> +
> + nor->program_opcode = SPINOR_OP_WB_PSECR;
> + nor->addr_width = 3;
> + nor->write_proto = SNOR_PROTO_1_1_1;
> +
> + /*
> + * We only support a write to one single page. For now all winbond
> + * flashes only have one page per OTP region.
> + */
> + ret = spi_nor_write_enable(nor);
> + if (ret)
> + goto out;
> +
> + ret = spi_nor_write_data(nor, addr, len, buf);
> + if (ret < 0)
> + goto out;
> +
> + ret = spi_nor_wait_till_ready(nor);
> +
> +out:
> + nor->program_opcode = program_opcode;
> + nor->addr_width = addr_width;
> + nor->write_proto = write_proto;
> +
> + return ret;
> +}
> +
> +static int _winbond_otp_lock_bit(unsigned int region)
> +{
> + static const int lock_bits[] = { SR2_WB_LB1, SR2_WB_LB2, SR2_WB_LB3
> };
> +
> + if (region >= ARRAY_SIZE(lock_bits))
> + return -EINVAL;
> +
> + return lock_bits[region];
> +}
> +
> +static int winbond_otp_lock(struct spi_nor *nor, unsigned int region)
> +{
> + int lock_bit;
> + u8 sr2;

will be "u8 *sr2 = nor->bouncebuf"; in the next version

> + int ret;
> +
> + lock_bit = _winbond_otp_lock_bit(region);
> + if (lock_bit < 0)
> + return lock_bit;
> +
> + ret = spi_nor_read_cr(nor, &sr2);
> + if (ret)
> + return ret;
> +
> + /* check if its already locked */
> + if (sr2 & lock_bit)
> + return 0;
> +
> + return spi_nor_write_16bit_cr_and_check(nor, sr2 | lock_bit);
> +}
> +
> +static int winbond_otp_is_locked(struct spi_nor *nor, unsigned int
> region)
> +{
> + int lock_bit;
> + u8 sr2;

likewise

> + int ret;
> +
> + lock_bit = _winbond_otp_lock_bit(region);
> + if (lock_bit < 0)
> + return lock_bit;
> +
> + ret = spi_nor_read_cr(nor, &sr2);
> + if (ret)
> + return ret;
> +
> + return (sr2 & lock_bit);
> +}
> +
> +static const struct spi_nor_otp_ops winbond_otp_ops = {
> + .read = winbond_otp_read,
> + .write = winbond_otp_write,
> + .lock = winbond_otp_lock,
> + .is_locked = winbond_otp_is_locked,
> +};
> +
> static void atmel_set_default_init(struct spi_nor *nor)
> {
> nor->flags |= SNOR_F_HAS_LOCK;
> @@ -4681,6 +4811,8 @@ static void st_micron_set_default_init(struct
> spi_nor *nor)
> static void winbond_set_default_init(struct spi_nor *nor)
> {
> nor->params.set_4byte = winbond_set_4byte;
> + if (nor->params.otp_info.n_otps)
> + nor->params.otp_ops = &winbond_otp_ops;
> }
>
> /**
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index e427dcd72f79..cc847ed06ef3 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -121,6 +121,20 @@
> #define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */
> #define SPINOR_OP_WD_EVCR 0x61 /* Write EVCR register */
>
> +/* Used for Winbond flashes only. */
> +#define SPINOR_OP_WB_ESECR 0x44 /* Erase Security registers */
> +#define SPINOR_OP_WB_PSECR 0x42 /* Program Security registers */
> +#define SPINOR_OP_WB_RSECR 0x48 /* Read Security registers */
> +
> +/*
> + * Warning: LB0 (and thus the security register 0) is used for the
> SFDP
> + * data on all newer flashes.
> + */
> +#define SR2_WB_LB0 BIT(2) /* Security Register Lock Bit 0 */
> +#define SR2_WB_LB1 BIT(3) /* Security Register Lock Bit 1 */
> +#define SR2_WB_LB2 BIT(4) /* Security Register Lock Bit 2 */
> +#define SR2_WB_LB3 BIT(5) /* Security Register Lock Bit 3 */
> +
> /* Status Register bits. */
> #define SR_WIP BIT(0) /* Write in progress */
> #define SR_WEL BIT(1) /* Write enable latch */

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