diff options
Diffstat (limited to 'src/soc/intel/tigerlake/p2sb.c')
| -rw-r--r-- | src/soc/intel/tigerlake/p2sb.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/soc/intel/tigerlake/p2sb.c b/src/soc/intel/tigerlake/p2sb.c new file mode 100644 index 0000000000..f5a3e70fce --- /dev/null +++ b/src/soc/intel/tigerlake/p2sb.c @@ -0,0 +1,49 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2019 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +/* + * This file is created based on Intel Tiger Lake Processor PCH Datasheet + * Document number: 575857 + * Chapter number: 3 + */ + +#include <console/console.h> +#include <intelblocks/p2sb.h> + +void p2sb_soc_get_sb_mask(uint32_t *ep_mask, size_t count) +{ + uint32_t mask; + + if (count != P2SB_EP_MASK_MAX_REG) { + printk(BIOS_ERR, "Unable to program EPMASK registers\n"); + return; + } + + /* Remove the host accessing right to PSF register range. + * Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to disable Sideband + * access for PCI Root Bridge. + */ + mask = (1 << 29) | (1 << 28) | (1 << 27) | (1 << 26); + + ep_mask[P2SB_EP_MASK_5_REG] = mask; + + /* + * Set p2sb PCI offset EPMASK7 [31, 30] to disable Sideband + * access for Broadcast and Multicast. + */ + mask = (1 << 31) | (1 << 30); + + ep_mask[P2SB_EP_MASK_7_REG] = mask; +} |