Messages in this thread Patch in this message | | | Date | Wed, 16 Nov 2016 11:10:58 -0600 | From | Han Xu <> | Subject | Re: [PATCH v3 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash |
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On Thu, Sep 15, 2016 at 06:50:55AM +0000, Krzeminski, Marcin (Nokia - PL/Wroclaw) wrote: > Hello, > > > -----Original Message----- > > From: linux-mtd [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf > > Of Han Xu > > Sent: Wednesday, September 14, 2016 9:49 PM > > To: Yunhui Cui <B56489@freescale.com> > > Cc: Yunhui Cui <yunhui.cui@nxp.com>; David Woodhouse > > <dwmw2@infradead.org>; linux-kernel@vger.kernel.org; linux- > > mtd@lists.infradead.org; han.xu@freescale.com; Brian Norris > > <computersforpeace@gmail.com>; jagannadh.teki@gmail.com; linux-arm- > > kernel@lists.infradead.org; Yao Yuan <yao.yuan@nxp.com> > > Subject: Re: [PATCH v3 6/9] mtd: spi-nor: Support R/W for S25FS-S family > > flash > > > > On Thu, Aug 18, 2016 at 2:38 AM, Yunhui Cui <B56489@freescale.com> > > wrote: > > > From: Yunhui Cui <yunhui.cui@nxp.com> > > > > > > With the physical sectors combination, S25FS-S family flash requires > > > some special operations for read/write functions. > > > > > > Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com> > > > --- > > > drivers/mtd/spi-nor/spi-nor.c | 56 > > > +++++++++++++++++++++++++++++++++++++++++++ > > > 1 file changed, 56 insertions(+) > > > > > > diff --git a/drivers/mtd/spi-nor/spi-nor.c > > > b/drivers/mtd/spi-nor/spi-nor.c index d0fc165..495d0bb 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_EXT_JEDEC 0x81 > > > > > > struct flash_info { > > > char *name; > > > @@ -78,6 +82,7 @@ struct flash_info { > > > }; > > > > > > #define JEDEC_MFR(info) ((info)->id[0]) > > > +#define EXT_JEDEC(info) ((info)->id[5]) > > > > > > static const struct flash_info *spi_nor_match_id(const char *name); > > > > > > @@ -899,6 +904,7 @@ 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) }, @@ -1036,6 +1042,50 > > @@ 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) { > > > + u32 cr3v_addr = SPINOR_CONFIG_REG3_OFFSET; > > > + u8 cr3v = 0x0; > > > + int ret = 0x0; > > > + > > > + 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, &cr3v); > > > + > > > + ret = nor->read_reg(nor, SPINOR_OP_SPANSION_RDAR, &cr3v, 1); > > > + if (ret) > > > + return ret; > > > + if (!(cr3v & CR3V_4KB_ERASE_UNABLE)) > > > + return -EPERM; > > > + > > > + return 0; > > > +} > > > + > > > static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len, > > > size_t *retlen, u_char *buf) { @@ -1361,6 > > > +1411,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, > > enum read_mode mode) > > > spi_nor_wait_till_ready(nor); > > > } > > > > > > + if (EXT_JEDEC(info) == SPINOR_S25FS_FAMILY_EXT_JEDEC) { > > > + ret = spansion_s25fs_disable_4kb_erase(nor); > > > + if (ret) > > > + return ret; > > > + } > > > + > > > if (!mtd->name) > > > mtd->name = dev_name(dev); > > > mtd->priv = nor; > > > -- > > > 2.1.0.27.g96db324 > > > > > > > > Hi Brian, I will ack this change but still feel it's kind of hacking code. > > > > Acked-by: Han xu <han.xu@nxp.com> > > I am new on the list so I am not sure if this topic has been discussed. > Generally our product functionality relay on those 4KiB sectors. > I know that this hack is already in u-boot, but if you mainstream this > you will force users of those 4KiB sectors to do hack the hack... > I believe the proper solution here is to use erase regions functionality, > I send and RFS about that some time ago.
Do you mind to send me a link for reference?
Sincerely, Han XU
> > Thanks, > Marcin > > > > ______________________________________________________ > > > Linux MTD discussion mailing list > > > http://lists.infradead.org/mailman/listinfo/linux-mtd/ > > > > > > > > -- > > Sincerely, > > > > Han XU > > > > ______________________________________________________ > > Linux MTD discussion mailing list > > http://lists.infradead.org/mailman/listinfo/linux-mtd/
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