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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-06-10 09:25:25 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-07-12 05:06:02 +0300 |
| commit | fea9cf321c916e9372874e6f2af1bf0b5beb89fb (patch) | |
| tree | ace39cd9a01090ee5df5bb8a1d62402471d87711 /drivers/fsi/fsi-master.h | |
| parent | 8ef9ccf81044a1e31d116b5d4972d5b65ae10846 (diff) | |
| download | linux-fea9cf321c916e9372874e6f2af1bf0b5beb89fb.tar.xz | |
fsi: Move various master definitions to a common header
This moves the definitions for various protocol details
(message & response codes, delays etc...) out of
fsi-master-gpio.c to fsi-master.h in order to share them
with other master implementations.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi/fsi-master.h')
| -rw-r--r-- | drivers/fsi/fsi-master.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h index 7d619c68ab9b..f653f75da7be 100644 --- a/drivers/fsi/fsi-master.h +++ b/drivers/fsi/fsi-master.h @@ -19,6 +19,39 @@ #include <linux/device.h> +/* Various protocol delays */ +#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */ +#define FSI_SEND_DELAY_CLOCKS 16 /* Number clocks for send delay */ +#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */ +#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */ +#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */ +#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */ +#define FSI_MASTER_DPOLL_CLOCKS 50 /* < 21 will cause slave to hang */ +#define FSI_MASTER_EPOLL_CLOCKS 50 /* Number of clocks for E_POLL retry */ + +/* Various retry maximums */ +#define FSI_CRC_ERR_RETRIES 10 +#define FSI_MASTER_MAX_BUSY 200 +#define FSI_MASTER_MTOE_COUNT 1000 + +/* Command encodings */ +#define FSI_CMD_DPOLL 0x2 +#define FSI_CMD_EPOLL 0x3 +#define FSI_CMD_TERM 0x3f +#define FSI_CMD_ABS_AR 0x4 +#define FSI_CMD_REL_AR 0x5 +#define FSI_CMD_SAME_AR 0x3 /* but only a 2-bit opcode... */ + +/* Slave responses */ +#define FSI_RESP_ACK 0 /* Success */ +#define FSI_RESP_BUSY 1 /* Slave busy */ +#define FSI_RESP_ERRA 2 /* Any (misc) Error */ +#define FSI_RESP_ERRC 3 /* Slave reports master CRC error */ + +/* Misc */ +#define FSI_CRC_SIZE 4 + +/* fsi-master definition and flags */ #define FSI_MASTER_FLAG_SWCLOCK 0x1 struct fsi_master { |