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authorAlexander Bondar <alexander.bondar@intel.com>2014-02-18 10:45:00 -0500
committerEmmanuel Grumbach <emmanuel.grumbach@intel.com>2014-03-09 13:16:39 -0400
commita812cba9bb141225ce28a48b60038e115620bccd (patch)
tree6294679a060230f8dd66dae2fc190c2e4273f575 /drivers/net/wireless/iwlwifi/iwl-io.h
parent8ea0c68fe56983f40256d0407ecf19530fd31442 (diff)
iwlwifi: pcie: enable LP XTAL to reduce power consumption
1. Enable LP XTAL to avoid HW bug where device may consume much power if FW is not loaded after device reset. LP XTAL is disabled by default after device HW reset. Configure device's "persistence" mode to avoid resetting XTAL again when SHRD_HW_RST occurs in S3. 2. Add methods to access SHR (shared block memory space) directly from PCI bus w/o need to power up MAC HW. Shared internal registers (e.g. SHR_APMG_GP1, SHR_APMG_XTAL_CFG)can be accessed directly from PCI bus through SHR arbiter even when MAC HW is powered down. This is possible due to indirect read/write via HEEP_CTRL_WRD_PCIEX_CTRL (0xEC) and HEEP_CTRL_WRD_PCIEX_DATA (0xF4) registers. Use iwl_write32()/iwl_read32() family to access these registers. The MAC HW need not be powered up so no "grab inc access" is required. For example, to read from SHR_APMG_GP1 register (0x1DC), first, write to the control register: HEEP_CTRL_WRD_PCIEX_CTRL[15:0] = 0x1DC (offset of the SHR_APMG_GP1 register) HEEP_CTRL_WRD_PCIEX_CTRL[29:28] = 2 (read access) second, read from the data register HEEP_CTRL_WRD_PCIEX_DATA[31:0]. To write the register, first, write to the data register HEEP_CTRL_WRD_PCIEX_DATA[31:0] and then: HEEP_CTRL_WRD_PCIEX_CTRL[15:0] = 0x1DC (offset of the SHR_APMG_GP1 register) HEEP_CTRL_WRD_PCIEX_CTRL[29:28] = 3 (write access) Signed-off-by: Alexander Bondar <alexander.bondar@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-io.h')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-io.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-io.h b/drivers/net/wireless/iwlwifi/iwl-io.h
index 9e81b23d738b..665ddd9dbbc4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-io.h
+++ b/drivers/net/wireless/iwlwifi/iwl-io.h
@@ -70,7 +70,9 @@ u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg);
70void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value); 70void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value);
71 71
72 72
73u32 __iwl_read_prph(struct iwl_trans *trans, u32 ofs);
73u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs); 74u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs);
75void __iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val);
74void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val); 76void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val);
75int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr, 77int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
76 u32 bits, u32 mask, int timeout); 78 u32 bits, u32 mask, int timeout);