From: Haim Dreyfuss <haim.dreyfuss@intel.com>
Date: Mon, 20 Jul 2015 11:16:21 +0000 (+0300)
Subject: iwlwifi: pcie: provide a way to stop configuration if it is forbidden
X-Git-Tag: v4.3-rc1~96^2~124^2~42^2~11
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=869f3b15c9fba037956f642b2023fd16d9ee2f56;p=karo-tx-linux.git

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>
---

diff --git a/drivers/net/wireless/iwlwifi/iwl-fw-file.h b/drivers/net/wireless/iwlwifi/iwl-fw-file.h
index f99ec4e22052..884825c70533 100644
--- a/drivers/net/wireless/iwlwifi/iwl-fw-file.h
+++ b/drivers/net/wireless/iwlwifi/iwl-fw-file.h
@@ -412,6 +412,12 @@ enum iwl_fw_dbg_reg_operator {
 	PRPH_ASSIGN,
 	PRPH_SETBIT,
 	PRPH_CLEARBIT,
+
+	INDIRECT_ASSIGN,
+	INDIRECT_SETBIT,
+	INDIRECT_CLEARBIT,
+
+	PRPH_BLOCKBIT,
 };
 
 /**
diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 88ab79fc6249..46e900e860e8 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -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);