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authorBen Cahill <ben.m.cahill@intel.com>2007-11-29 11:09:45 +0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:05:15 -0800
commit796083cb1d45d52d40ae2c933afcfc56d91ef427 (patch)
treec5dc4a5e7d6437a2a073ee15996f3b1e3ff7e657 /drivers/net/wireless/iwlwifi/iwl-3945.c
parent7762635547ad31ecb045e7073989e76ae13e6c54 (diff)
iwlwifi: add comments to EEPROM stuff
Add comments to EEPROM stuff. Signed-off-by: Ben Cahill <ben.m.cahill@intel.com> Signed-off-by: Zhu Yi <yi.zhu@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-3945.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-3945.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 953a9bec063..51b90309ce5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -2202,6 +2202,7 @@ int iwl3945_init_hw_rate_table(struct iwl3945_priv *priv)
&rate_cmd);
}
+/* Called when initializing driver */
int iwl3945_hw_set_hw_setting(struct iwl3945_priv *priv)
{
memset((void *)&priv->hw_setting, 0,
@@ -2284,6 +2285,14 @@ struct pci_device_id iwl3945_hw_card_ids[] = {
{0}
};
+/*
+ * Clear the OWNER_MSK, to establish driver (instead of uCode running on
+ * embedded controller) as EEPROM reader; each read is a series of pulses
+ * to/from the EEPROM chip, not a single event, so even reads could conflict
+ * if they weren't arbitrated by some ownership mechanism. Here, the driver
+ * simply claims ownership, which should be safe when this function is called
+ * (i.e. before loading uCode!).
+ */
inline int iwl3945_eeprom_acquire_semaphore(struct iwl3945_priv *priv)
{
_iwl3945_clear_bit(priv, CSR_EEPROM_GP, CSR_EEPROM_GP_IF_OWNER_MSK);