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iwlwifi: pcie: provide a way to stop configuration if it is forbidden 

The firmware debug infrastructure allows the user to
provide a firmware that will toggle a few registers to
configure the debugging capabilities.
On certain devices, certain operations are forbidden.
Executing a forbidden operation will cause the hardware to
die in a way that only driver unload / load will bring it
back to life.
Fortunately, there is a way to know in advance if those
operations will be accepted by the device. This is where
the new PRPH_BLOCKBIT operation plays its role. If the bit
X from PRPH register Y is set, then we should prevent any
further register configuration. When that happens, drop a
line in the kernel log since this is really an error state:
the user won't have his device configured as he expected.
Add operations that will be used in the future:
INDIRECT_ASSIGN, INDIRECT_SETBIT, and INDIRECT_CLEARBIT.

Other debugging configurations (such as destination
configuration for the monitor) will take place in any case.

Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Haim Dreyfuss 2015-07-20 14:16:21 +03:00 committed by Emmanuel Grumbach
parent d0ab08d05e
commit 869f3b15c9
2 changed files with 15 additions and 0 deletions
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6
drivers/net/wireless/iwlwifi/iwl-fw-file.h
View File

@ -412,6 +412,12 @@ enum iwl_fw_dbg_reg_operator {
PRPH_ASSIGN,
PRPH_SETBIT,
PRPH_CLEARBIT,
INDIRECT_ASSIGN,
INDIRECT_SETBIT,
INDIRECT_CLEARBIT,
PRPH_BLOCKBIT,
};
/**

9
drivers/net/wireless/iwlwifi/pcie/trans.c
View File

@ -881,6 +881,14 @@ static void iwl_pcie_apply_destination(struct iwl_trans *trans)
case PRPH_CLEARBIT:
iwl_clear_bits_prph(trans, addr, BIT(val));
break;
case PRPH_BLOCKBIT:
if (iwl_read_prph(trans, addr) & BIT(val)) {
IWL_ERR(trans,
"BIT(%u) in address 0x%x is 1, stopping FW configuration\n",
val, addr);
goto monitor;
}
break;
default:
IWL_ERR(trans, "FW debug - unknown OP %d\n",
dest->reg_ops[i].op);
@ -888,6 +896,7 @@ static void iwl_pcie_apply_destination(struct iwl_trans *trans)
}
}
monitor:
if (dest->monitor_mode == EXTERNAL_MODE && trans_pcie->fw_mon_size) {
iwl_write_prph(trans, le32_to_cpu(dest->base_reg),
trans_pcie->fw_mon_phys >> dest->base_shift);