RE: [PATCH v2 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash

[Yunhui Cui]

On August 16, 2016 2:03 AM, Leo wrote:

> On Fri, Apr 22, 2016 at 1:39 AM, Yunhui Cui <B56489@xxxxxxxxxxxxx> wrote:
> > From: Yunhui Cui <yunhui.cui@xxxxxxx>
> >
> > With the physical sectors combination, S25FS-S family flash requires
> > some special operations for read/write functions.
> >
> > Signed-off-by: Yunhui Cui <yunhui.cui@xxxxxxx>
> > ---
> >  drivers/mtd/spi-nor/spi-nor.c | 59
> > +++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 59 insertions(+)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c
> > b/drivers/mtd/spi-nor/spi-nor.c index 157841d..91ee920 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -39,6 +39,10 @@
> >
> >  #define SPI_NOR_MAX_ID_LEN     6
> >  #define SPI_NOR_MAX_ADDR_WIDTH 4
> > +/* Added for S25FS-S family flash */
> > +#define SPINOR_CONFIG_REG3_OFFSET      0x800004
> > +#define CR3V_4KB_ERASE_UNABLE  0x8
> > +#define SPINOR_S25FS_FAMILY_ID 0x81
> >
> >  struct flash_info {
> >         char            *name;
> > @@ -78,6 +82,7 @@ struct flash_info {
> >  };
> >
> >  #define JEDEC_MFR(info)        ((info)->id[0])
> > +#define EXT_ID(info)   ((info)->id[5])
> >
> >  static const struct flash_info *spi_nor_match_id(const char *name);
> >
> > @@ -881,6 +886,7 @@ static const struct flash_info spi_nor_ids[] = {
> >          */
> >         { "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64,
> SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> >         { "s25sl064p",  INFO(0x010216, 0x4d00,  64 * 1024, 128,
> > SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> > +       { "s25fs256s1", INFO6(0x010219, 0x4d0181, 64 * 1024, 512, 0)},
> >         { "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
> >         { "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512,
> SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> >         { "s25fl512s",  INFO(0x010220, 0x4d00, 256 * 1024, 256,
> > SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) }, @@ -1018,6 +1024,53 @@ static
> const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
> >         return ERR_PTR(-ENODEV);
> >  }
> >
> > +/*
> > + * The S25FS-S family physical sectors may be configured as a
> > + * hybrid combination of eight 4-kB parameter sectors
> > + * at the top or bottom of the address space with all
> > + * but one of the remaining sectors being uniform size.
> > + * The Parameter Sector Erase commands (20h or 21h) must
> > + * be used to erase the 4-kB parameter sectors individually.
> > + * The Sector (uniform sector) Erase commands (D8h or DCh)
> > + * must be used to erase any of the remaining
> > + * sectors, including the portion of highest or lowest address
> > + * sector that is not overlaid by the parameter sectors.
> > + * The uniform sector erase command has no effect on parameter sectors.
> > + */
> > +static int spansion_s25fs_disable_4kb_erase(struct spi_nor *nor) {
> > +       struct fsl_qspi *q;
> > +       u32 cr3v_addr  = SPINOR_CONFIG_REG3_OFFSET;
> > +       u8 cr3v = 0x0;
> > +       int ret = 0x0;
> > +
> > +       q = nor->priv;
> > +
> > +       nor->cmd_buf[2] = cr3v_addr >> 16;
> > +       nor->cmd_buf[1] = cr3v_addr >> 8;
> > +       nor->cmd_buf[0] = cr3v_addr >> 0;
> > +
> > +       ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1);
> > +       if (ret)
> > +               return ret;
> > +       if (cr3v & CR3V_4KB_ERASE_UNABLE)
> > +               return 0;
> > +       ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> > +       if (ret)
> > +               return ret;
> > +       cr3v = CR3V_4KB_ERASE_UNABLE;
> > +       nor->program_opcode = SPINOR_OP_SPANSION_WRAR;
> > +       nor->write(nor, cr3v_addr, 1, NULL, &cr3v);
> 
> The patch need to be re-spined due to the parameter change of write() in
> v4.8-rc.  Otherwise it can not pass build.
> 

[Yunhui]Thanks for your reminder, I will check and update it .

> Regards,
> Leo