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Message-ID: <CA+EcR20gNsuWG7pXimCmXmMy1wFFOv+zocMXTQoFhysGQ+wEFA@mail.gmail.com>
Date: Thu, 17 Nov 2016 22:30:50 -0600
From: Han Xu <xhnjupt@...il.com>
To: Yao Yuan <yao.yuan@....com>
Cc: "Krzeminski, Marcin (Nokia - PL/Wroclaw)"
<marcin.krzeminski@...ia.com>,
David Woodhouse <dwmw2@...radead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"han.xu@...escale.com" <han.xu@...escale.com>,
Brian Norris <computersforpeace@...il.com>,
"jagannadh.teki@...il.com" <jagannadh.teki@...il.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 6/9] mtd: spi-nor: Support R/W for S25FS-S family flash
On Thu, Nov 17, 2016 at 3:14 AM, Yao Yuan <yao.yuan@....com> wrote:
> On Thu, Nov 17, 2016 at 06:50:55AM +0000, Krzeminski, Marcin (Nokia - PL/Wroclaw) wrote:
>> > > > On Thu, Aug 18, 2016 at 2:38 AM, Yunhui Cui <B56489@...escale.com>
>> > > > wrote:
>> > > > > From: Yunhui Cui <yunhui.cui@....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@....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@....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?
>> >
>> Han,
>>
>> Sorry, It seem I have not posted erase region changes (only those regarding
>> DUAL/QUAD I/O).
>> Generally, in this flash you need to create 3 erase regions (because in FS-S
>> family support only 4KiB erase on parameters sector - eg. 1.2.2.4 in S25FS512S).
>> In my case regions are:
>> 1. 0-32KiB (8*4KiB) - 4K_ERASE (0x20/0x21) 2. 32 - 256 - SE_CMD (0xd8/0xdc) 3.
>> Rest of the flash SE_CMD (0xd8/0xdc)
>>
>> To erase whole flash you can also use CHIP_ERASE_CMD (0x60/0xC7) command,
>> you just need to add one more mtd partition that will cover whole flash.
>>
>
> Hi Krzeminski,
>
> Do you think is there any great advantages for enable 4KB?
> Because for NXP(Freescale) QSPI controller, there is only support max to 16 groups command.
If it's really necessary to support all command groups, you can try
apply my dynamic lut patch first.
https://patchwork.ozlabs.org/patch/676791/
>
> So It's hard to give 3 groups command just for erase (0x21,0xdc and 0xc7).
> So we have to disable the 4kb erase and only use 256kbytes in this patch.
>
>
--
Sincerely,
Han XU
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