diff options
Diffstat (limited to 'src/soc/amd/common/block/data_fabric/data_fabric_helper.c')
| -rw-r--r-- | src/soc/amd/common/block/data_fabric/data_fabric_helper.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/data_fabric/data_fabric_helper.c b/src/soc/amd/common/block/data_fabric/data_fabric_helper.c new file mode 100644 index 0000000000..e8e02d8eb1 --- /dev/null +++ b/src/soc/amd/common/block/data_fabric/data_fabric_helper.c @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <amdblocks/data_fabric.h> +#include <amdblocks/pci_devs.h> +#include <device/pci_ops.h> +#include <soc/pci_devs.h> +#include <types.h> +#include "data_fabric_def.h" + +static void data_fabric_set_indirect_address(uint8_t func, uint16_t reg, uint8_t instance_id) +{ + uint32_t fabric_indirect_access_reg = DF_IND_CFG_INST_ACC_EN; + /* Register offset field [10:2] in this register corresponds to [10:2] of the + requested offset. */ + fabric_indirect_access_reg |= reg & DF_IND_CFG_ACC_REG_MASK; + fabric_indirect_access_reg |= + (func << DF_IND_CFG_ACC_FUN_SHIFT) & DF_IND_CFG_ACC_FUN_MASK; + fabric_indirect_access_reg |= instance_id << DF_IND_CFG_INST_ID_SHIFT; + pci_write_config32(SOC_DF_F4_DEV, DF_FICAA_BIOS, fabric_indirect_access_reg); +} + +uint32_t data_fabric_read32(uint8_t function, uint16_t reg, uint8_t instance_id) +{ + if (instance_id == BROADCAST_FABRIC_ID) + /* No bit masking required. Macros will apply mask to values. */ + return pci_read_config32(_SOC_DEV(DF_DEV, function), reg); + + /* non-broadcast data fabric accesses need to be done via indirect access */ + data_fabric_set_indirect_address(function, reg, instance_id); + return pci_read_config32(SOC_DF_F4_DEV, DF_FICAD_LO); +} |