diff options
| author |   Abhijit Gangurde <abhijit.gangurde@amd.com> | 2023-10-17 21:35:03 +0530 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-27 13:23:24 +0200 |
| commit | e3cfd49cb9491ac1cc233a4b9e098688b4ab281d (patch) | |
| tree | 15029eab27a1d6205226fa16d723222bb7363d84 /drivers/cdx/controller/mcdi_functions.c | |
| parent | cdx: Register cdx bus as a device on cdx subsystem (diff) | |
| download | linux-rng-e3cfd49cb9491ac1cc233a4b9e098688b4ab281d.tar.xz linux-rng-e3cfd49cb9491ac1cc233a4b9e098688b4ab281d.zip | |
cdx: add support for bus enable and disable
CDX bus needs to be disabled before updating/writing devices
in the FPGA. Once the devices are written, the bus shall be
rescanned. This change provides sysfs entry to enable/disable the
CDX bus.
Co-developed-by: Nipun Gupta <nipun.gupta@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://lore.kernel.org/r/20231017160505.10640-6-abhijit.gangurde@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cdx/controller/mcdi_functions.c')
| -rw-r--r-- | drivers/cdx/controller/mcdi_functions.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/cdx/controller/mcdi_functions.c b/drivers/cdx/controller/mcdi_functions.c index 0158f26533dd..0e1e35d91242 100644 --- a/drivers/cdx/controller/mcdi_functions.c +++ b/drivers/cdx/controller/mcdi_functions.c @@ -124,6 +124,30 @@ int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx, return 0; } +int cdx_mcdi_bus_enable(struct cdx_mcdi *cdx, u8 bus_num) +{ + MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_UP_IN_LEN); + int ret; + + MCDI_SET_DWORD(inbuf, CDX_BUS_UP_IN_BUS, bus_num); + ret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_UP, inbuf, sizeof(inbuf), + NULL, 0, NULL); + + return ret; +} + +int cdx_mcdi_bus_disable(struct cdx_mcdi *cdx, u8 bus_num) +{ + MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_DOWN_IN_LEN); + int ret; + + MCDI_SET_DWORD(inbuf, CDX_BUS_DOWN_IN_BUS, bus_num); + ret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_DOWN, inbuf, sizeof(inbuf), + NULL, 0, NULL); + + return ret; +} + int cdx_mcdi_reset_device(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num) { MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_DEVICE_RESET_IN_LEN); |