From a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3 Mon Sep 17 00:00:00 2001 From: Nipun Gupta Date: Fri, 15 Sep 2023 10:24:21 +0530 Subject: cdx: add support for bus mastering Introduce cdx_set_master() and cdx_clear_master() APIs to support enable and disable of bus mastering. Drivers need to use these APIs to enable/disable DMAs from the CDX devices. Signed-off-by: Nipun Gupta Reviewed-by: Pieter Jansen van Vuuren Link: https://lore.kernel.org/r/20230915045423.31630-1-nipun.gupta@amd.com Signed-off-by: Alex Williamson --- drivers/cdx/controller/mcdi_functions.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/cdx/controller/mcdi_functions.h') diff --git a/drivers/cdx/controller/mcdi_functions.h b/drivers/cdx/controller/mcdi_functions.h index 7440ace5539a..a448d6581eb4 100644 --- a/drivers/cdx/controller/mcdi_functions.h +++ b/drivers/cdx/controller/mcdi_functions.h @@ -58,4 +58,17 @@ int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx, int cdx_mcdi_reset_device(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num); +/** + * cdx_mcdi_bus_master_enable - Set/Reset bus mastering for cdx device + * represented by bus_num:dev_num + * @cdx: pointer to MCDI interface. + * @bus_num: Bus number. + * @dev_num: Device number. + * @enable: Enable bus mastering if set, disable otherwise. + * + * Return: 0 on success, <0 on failure + */ +int cdx_mcdi_bus_master_enable(struct cdx_mcdi *cdx, u8 bus_num, + u8 dev_num, bool enable); + #endif /* CDX_MCDI_FUNCTIONS_H */ -- cgit v1.2.3-70-g09d2