diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/uefi.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/uefi.c | 59 |
1 files changed, 58 insertions, 1 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c index 6d408cd0f517..0b6f694cf30d 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c +++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* - * Copyright(c) 2021 Intel Corporation + * Copyright(c) 2021-2022 Intel Corporation */ #include "iwl-drv.h" @@ -246,6 +246,63 @@ void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len) return data; } +static int iwl_uefi_step_parse(struct uefi_cnv_common_step_data *common_step_data, + struct iwl_trans *trans) +{ + if (common_step_data->revision != 1) + return -EINVAL; + + trans->mbx_addr_0_step = (u32)common_step_data->revision | + (u32)common_step_data->cnvi_eq_channel << 8 | + (u32)common_step_data->cnvr_eq_channel << 16 | + (u32)common_step_data->radio1 << 24; + trans->mbx_addr_1_step = (u32)common_step_data->radio2; + return 0; +} + +void iwl_uefi_get_step_table(struct iwl_trans *trans) +{ + struct uefi_cnv_common_step_data *data; + unsigned long package_size; + efi_status_t status; + int ret; + + if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210) + return; + + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) + return; + + /* TODO: we hardcode a maximum length here, because reading + * from the UEFI is not working. To implement this properly, + * we have to call efivar_entry_size(). + */ + package_size = IWL_HARDCODED_STEP_SIZE; + + data = kmalloc(package_size, GFP_KERNEL); + if (!data) + return; + + status = efi.get_variable(IWL_UEFI_STEP_NAME, &IWL_EFI_VAR_GUID, + NULL, &package_size, data); + if (status != EFI_SUCCESS) { + IWL_DEBUG_FW(trans, + "STEP UEFI variable not found 0x%lx\n", status); + goto out_free; + } + + IWL_DEBUG_FW(trans, "Read STEP from UEFI with size %lu\n", + package_size); + + ret = iwl_uefi_step_parse(data, trans); + if (ret < 0) + IWL_DEBUG_FW(trans, "Cannot read STEP tables. rev is invalid\n"); + +out_free: + kfree(data); +} +IWL_EXPORT_SYMBOL(iwl_uefi_get_step_table); + #ifdef CONFIG_ACPI static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data, struct iwl_fw_runtime *fwrt) |