Hello! On 03/21/2019 08:45 PM, Vignesh Raghavendra wrote: > HyperFlash devices are compliant with CFI AMD/Fujitsu Extended Command > Set(0x0002) for flash operations, therefore drivers/mtd/chips/cfi_cmdset_0002.c > can be use as is. But these devices do not support DQ polling method of > determining chip ready/good status. These flashes provide Status > Register whose bits can be polled to know status of flash operation. > > Cypress HyperFlash datasheet here[1], talks about CFI Amd/Fujitsu > Extended Query version 1.5. Bit 0 of "Software Features supported" field > of CFI Primary Vendor-Specific Extended Query table indicates > presence/absence of status register and Bit 1 indicates whether or not > DQ polling is supported. Using these bits, its possible to determine > whether flash supports DQ polling or need to use Status Register. We need? > Add support for polling status register to know device ready/status of > erase/write operations when DQ polling is not supported. > > [1] https://www.cypress.com/file/213346/download > > Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx> > --- > drivers/mtd/chips/cfi_cmdset_0002.c | 50 +++++++++++++++++++++++++++++ > include/linux/mtd/cfi.h | 5 +++ > 2 files changed, 55 insertions(+) > > diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c > index 72428b6bfc47..29987d8e6c6e 100644 > --- a/drivers/mtd/chips/cfi_cmdset_0002.c > +++ b/drivers/mtd/chips/cfi_cmdset_0002.c [...] > diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h > index cbf77168658c..92ac82ac2329 100644 > --- a/include/linux/mtd/cfi.h > +++ b/include/linux/mtd/cfi.h > @@ -233,6 +233,11 @@ struct cfi_pri_amdstd { > uint8_t VppMin; > uint8_t VppMax; > uint8_t TopBottom; > + /* Below field are added from version 1.5 */ The below fields are. > + uint8_t ProgramSuspend; > + uint8_t UnlockBypass; > + uint8_t SecureSiliconSector; > + uint8_t SoftwareFeatures; > } __packed; > > /* Vendor-Specific PRI for Atmel chips (command set 0x0002) */ > MBR, Sergei
