diff options
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 6e08fe8cc0fe..fd02f9e2a829 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -64,6 +64,32 @@ static inline int cxl_hdm_decoder_count(u32 cap_hdr) return val ? val * 2 : 1; } +/* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */ +static inline int cxl_to_granularity(u16 ig, unsigned int *val) +{ + if (ig > 6) + return -EINVAL; + *val = 256 << ig; + return 0; +} + +/* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */ +static inline int cxl_to_ways(u8 eniw, unsigned int *val) +{ + switch (eniw) { + case 0 ... 4: + *val = 1 << eniw; + break; + case 8 ... 10: + *val = 3 << (eniw - 8); + break; + default: + return -EINVAL; + } + + return 0; +} + /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */ #define CXLDEV_CAP_ARRAY_OFFSET 0x0 #define CXLDEV_CAP_ARRAY_CAP_ID 0 |