On Thu, 20 Oct 2022, matthew.gerlach@xxxxxxxxxxxxxxx wrote: > From: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@xxxxxxxxxxxxxxx> > > This patch adds the definitions for DFHv1 header and related register > bitfields. > > Signed-off-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@xxxxxxxxxxxxxxx> > Signed-off-by: Matthew Gerlach <matthew.gerlach@xxxxxxxxxxxxxxx> > --- > v4: s/MSIX/MSI_X/g > move kerneldoc to implementation > don't change copyright date > > v3: > keep DFHv1 definitions "hidden" in drivers/fpga/dfl.h > > v2: clean up whitespace and one line comments > remove extra space in commit > use uniform number of digits in constants > don't change copyright date because of removed content > > dfl.h s/MSIX/MSI_X/g move kerneldoc > --- > drivers/fpga/dfl.h | 33 +++++++++++++++++++++++++++++++++ > include/linux/dfl.h | 11 +++++++++++ > 2 files changed, 44 insertions(+) > > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h > index 06cfcd5e84bb..45e6e1359a67 100644 > --- a/drivers/fpga/dfl.h > +++ b/drivers/fpga/dfl.h > @@ -74,11 +74,44 @@ > #define DFH_REVISION GENMASK_ULL(15, 12) /* Feature revision */ > #define DFH_NEXT_HDR_OFST GENMASK_ULL(39, 16) /* Offset to next DFH */ > #define DFH_EOL BIT_ULL(40) /* End of list */ > +#define DFH_VERSION GENMASK_ULL(59, 52) /* DFH version */ > #define DFH_TYPE GENMASK_ULL(63, 60) /* Feature type */ > #define DFH_TYPE_AFU 1 > #define DFH_TYPE_PRIVATE 3 > #define DFH_TYPE_FIU 4 > > +/* > + * DFHv1 Register Offset definitons > + * In DHFv1, DFH + GUID + CSR_START + CSR_SIZE_GROUP + PARAM_HDR + PARAM_DATA > + * as common header registers > + */ > +#define DFHv1_CSR_ADDR 0x18 /* CSR Register start address */ > +#define DFHv1_CSR_SIZE_GRP 0x20 /* Size of Reg Block and Group/tag */ > +#define DFHv1_PARAM_HDR 0x28 /* Optional First Param header */ > + > +/* > + * CSR Rel Bit, 1'b0 = relative (offset from feature DFH start), > + * 1'b1 = absolute (ARM or other non-PCIe use) > + */ > +#define DFHv1_CSR_ADDR_REL BIT_ULL(0) > + > +/* CSR Header Register Bit Definitions */ > +#define DFHv1_CSR_ADDR_MASK GENMASK_ULL(63, 1) /* 63:1 of CSR address */ > + > +/* CSR SIZE Goup Register Bit Definitions */ > +#define DFHv1_CSR_SIZE_GRP_INSTANCE_ID GENMASK_ULL(15, 0) /* Enumeration instantiated IP */ > +#define DFHv1_CSR_SIZE_GRP_GROUPING_ID GENMASK_ULL(30, 16) /* Group Features/interfaces */ > +#define DFHv1_CSR_SIZE_GRP_HAS_PARAMS BIT_ULL(31) /* Presence of Parameters */ > +#define DFHv1_CSR_SIZE_GRP_SIZE GENMASK_ULL(63, 32) /* Size of CSR Block in bytes */ SIZE -> SZ would remove two letters w/o loss of info (remember to rename the offset too if you make this change). > +/* PARAM Header Register Bit Definitions */ > +#define DFHv1_PARAM_HDR_ID GENMASK_ULL(15, 0) /* Id of this Param */ > +#define DFHv1_PARAM_HDR_VERSION GENMASK_ULL(31, 16) /* Version Param */ > +#define DFHv1_PARAM_HDR_NEXT_OFFSET GENMASK_ULL(63, 32) /* Offset of next Param */ > +#define DFHv1_PARAM_HDR_NEXT_EOL BIT_ULL(0) > +#define DFHv1_PARAM_HDR_NEXT_MASK GENMASK_ULL(1, 0) > +#define DFHv1_PARAM_DATA 0x08 /* Offset of Param data from Param header */ > + > /* Next AFU Register Bitfield */ > #define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */ > > diff --git a/include/linux/dfl.h b/include/linux/dfl.h > index 431636a0dc78..fea9e16d35b6 100644 > --- a/include/linux/dfl.h > +++ b/include/linux/dfl.h > @@ -11,6 +11,17 @@ > #include <linux/device.h> > #include <linux/mod_devicetable.h> > > +#define DFHv1_PARAM_ID_MSI_X 0x1 > +#define DFHv1_PARAM_MSI_X_STARTV 0x0 > +#define DFHv1_PARAM_MSI_X_NUMV 0x4 > + > +#define DFHv1_PARAM_ID_CLK_FRQ 0x2 > +#define DFHv1_PARAM_ID_FIFO_LEN 0x3 > + > +#define DFHv1_PARAM_ID_REG_LAYOUT 0x4 > +#define DFHv1_PARAM_ID_REG_WIDTH GENMASK_ULL(63, 32) > +#define DFHv1_PARAM_ID_REG_SHIFT GENMASK_ULL(31, 0) Any particular reason why MSI_X parameters are given as offsets and these REG_LAYOUT ones as bitfields (both are 32-bit)? The naming here would indicate that DFHv1_PARAM_ID_REG_WIDTH is one of the parameters but it's part of param data instead. I suppose you'd want DFHv1_PARAM_REG_LAYOUT_WIDTH instead. -- i.
