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ath9k_hw: Add hardware code for WoW

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add a new file wow.c which takes care of the hardware code
for WoW.

*program the descriptors and data words to periodically
send Keep Alive Frames.
*program the user defined patterns/masks and pattern length
in the hardware registers.
*'ath9k_hw_wow_enable' is called during the drivers suspend
callback which takes care of the following
	- tracking wow event mask (to suppress spurious
	  wow events)
	- properly configure suspend/resume WAR registers
	- configure PCIE PM control register
	- configure MAC WoW registers and their timeouts
	- enabling wow configuration like magic packet,
	  user patterns based on users configuration
	- configuring timeouts for KAL, beacon miss,
	  aifs, slot time, backoff
	- create Keep Alive Pattern ('KAL')
*'ath9k_hw_wow_wakeup' is called during the drivers resume
callback which takes care of the following
	- primary task is to find the reason for wakeup
	  from the wow status register
	- configure/restore AR_PCIE_PM_CTRL register
	- clear all WoW events
	- configure/restore suspend/resume WAR registers

Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Cc: vadivel@qca.qualcomm.com
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Mohammed Shafi Shajakhan 2012-07-10 14:56:15 +05:30 committed by John W. Linville
parent 3b604b6cf8
commit 64875c63c9
3 changed files with 564 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/ath/ath9k/Makefile
View File

@ -17,6 +17,7 @@ ath9k-$(CONFIG_ATH9K_DFS_CERTIFIED) += \
dfs.o \
dfs_pattern_detector.o \
dfs_pri_detector.o
ath9k-$(CONFIG_PM_SLEEP) += wow.o
obj-$(CONFIG_ATH9K) += ath9k.o

31
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -1112,6 +1112,37 @@ ath9k_hw_get_btcoex_scheme(struct ath_hw *ah)
}
#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */
#ifdef CONFIG_PM_SLEEP
const char *ath9k_hw_wow_event_to_string(u32 wow_event);
void ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern,
u8 *user_mask, int pattern_count,
int pattern_len);
u32 ath9k_hw_wow_wakeup(struct ath_hw *ah);
void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable);
#else
static inline const char *ath9k_hw_wow_event_to_string(u32 wow_event)
{
return NULL;
}
static inline void ath9k_hw_wow_apply_pattern(struct ath_hw *ah,
u8 *user_pattern,
u8 *user_mask,
int pattern_count,
int pattern_len)
{
}
static inline u32 ath9k_hw_wow_wakeup(struct ath_hw *ah)
{
return 0;
}
static inline void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable)
{
}
#endif
#define ATH9K_CLOCK_RATE_CCK 22
#define ATH9K_CLOCK_RATE_5GHZ_OFDM 40
#define ATH9K_CLOCK_RATE_2GHZ_OFDM 44

532
drivers/net/wireless/ath/ath9k/wow.c Normal file
View File

@ -0,0 +1,532 @@
/*
* Copyright (c) 2012 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/export.h>
#include "ath9k.h"
#include "reg.h"
#include "hw-ops.h"
const char *ath9k_hw_wow_event_to_string(u32 wow_event)
{
if (wow_event & AH_WOW_MAGIC_PATTERN_EN)
return "Magic pattern";
if (wow_event & AH_WOW_USER_PATTERN_EN)
return "User pattern";
if (wow_event & AH_WOW_LINK_CHANGE)
return "Link change";
if (wow_event & AH_WOW_BEACON_MISS)
return "Beacon miss";
return "unknown reason";
}
EXPORT_SYMBOL(ath9k_hw_wow_event_to_string);
static void ath9k_hw_config_serdes_wow_sleep(struct ath_hw *ah)
{
int i;
for (i = 0; i < ah->iniPcieSerdesWow.ia_rows; i++)
REG_WRITE(ah, INI_RA(&ah->iniPcieSerdesWow, i, 0),
INI_RA(&ah->iniPcieSerdesWow, i, 1));
usleep_range(1000, 1500);
}
static void ath9k_hw_set_powermode_wow_sleep(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
/* set rx disable bit */
REG_WRITE(ah, AR_CR, AR_CR_RXD);
if (!ath9k_hw_wait(ah, AR_CR, AR_CR_RXE, 0, AH_WAIT_TIMEOUT)) {
ath_err(common, "Failed to stop Rx DMA in 10ms AR_CR=0x%08x AR_DIAG_SW=0x%08x\n",
REG_READ(ah, AR_CR), REG_READ(ah, AR_DIAG_SW));
return;
} else {
if (!AR_SREV_9300_20_OR_LATER(ah))
REG_WRITE(ah, AR_RXDP, 0x0);
}
/* AR9280 WoW has sleep issue, do not set it to sleep */
if (AR_SREV_9280_20(ah))
return;
REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_ON_INT);
}
static void ath9k_wow_create_keep_alive_pattern(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
u8 sta_mac_addr[ETH_ALEN], ap_mac_addr[ETH_ALEN];
u32 ctl[13] = {0};
u32 data_word[KAL_NUM_DATA_WORDS];
u8 i;
u32 wow_ka_data_word0;
memcpy(sta_mac_addr, common->macaddr, ETH_ALEN);
memcpy(ap_mac_addr, common->curbssid, ETH_ALEN);
/* set the transmit buffer */
ctl[0] = (KAL_FRAME_LEN | (MAX_RATE_POWER << 16));
if (!(AR_SREV_9300_20_OR_LATER(ah)))
ctl[0] += (KAL_ANTENNA_MODE << 25);
ctl[1] = 0;
ctl[3] = 0xb; /* OFDM_6M hardware value for this rate */
ctl[4] = 0;
ctl[7] = (ah->txchainmask) << 2;
if (AR_SREV_9300_20_OR_LATER(ah))
ctl[2] = 0xf << 16; /* tx_tries 0 */
else
ctl[2] = 0x7 << 16; /* tx_tries 0 */
for (i = 0; i < KAL_NUM_DESC_WORDS; i++)
REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]);
/* for AR9300 family 13 descriptor words */
if (AR_SREV_9300_20_OR_LATER(ah))
REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]);
data_word[0] = (KAL_FRAME_TYPE << 2) | (KAL_FRAME_SUB_TYPE << 4) |
(KAL_TO_DS << 8) | (KAL_DURATION_ID << 16);
data_word[1] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
(ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
data_word[2] = (sta_mac_addr[1] << 24) | (sta_mac_addr[0] << 16) |
(ap_mac_addr[5] << 8) | (ap_mac_addr[4]);
data_word[3] = (sta_mac_addr[5] << 24) | (sta_mac_addr[4] << 16) |
(sta_mac_addr[3] << 8) | (sta_mac_addr[2]);
data_word[4] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
(ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
data_word[5] = (ap_mac_addr[5] << 8) | (ap_mac_addr[4]);
if (AR_SREV_9462_20_OR_LATER(ah)) {
/* AR9462 2.0 has an extra descriptor word (time based
* discard) compared to other chips */
REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + (12 * 4)), 0);
wow_ka_data_word0 = AR_WOW_TXBUF(13);
} else {
wow_ka_data_word0 = AR_WOW_TXBUF(12);
}
for (i = 0; i < KAL_NUM_DATA_WORDS; i++)
REG_WRITE(ah, (wow_ka_data_word0 + i*4), data_word[i]);
}
void ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern,
u8 *user_mask, int pattern_count,
int pattern_len)
{
int i;
u32 pattern_val, mask_val;
u32 set, clr;
/* FIXME: should check count by querying the hardware capability */
if (pattern_count >= MAX_NUM_PATTERN)
return;
REG_SET_BIT(ah, AR_WOW_PATTERN, BIT(pattern_count));
/* set the registers for pattern */
for (i = 0; i < MAX_PATTERN_SIZE; i += 4) {
memcpy(&pattern_val, user_pattern, 4);
REG_WRITE(ah, (AR_WOW_TB_PATTERN(pattern_count) + i),
pattern_val);
user_pattern += 4;
}
/* set the registers for mask */
for (i = 0; i < MAX_PATTERN_MASK_SIZE; i += 4) {
memcpy(&mask_val, user_mask, 4);
REG_WRITE(ah, (AR_WOW_TB_MASK(pattern_count) + i), mask_val);
user_mask += 4;
}
/* set the pattern length to be matched
*
* AR_WOW_LENGTH1_REG1
* bit 31:24 pattern 0 length
* bit 23:16 pattern 1 length
* bit 15:8 pattern 2 length
* bit 7:0 pattern 3 length
*
* AR_WOW_LENGTH1_REG2
* bit 31:24 pattern 4 length
* bit 23:16 pattern 5 length
* bit 15:8 pattern 6 length
* bit 7:0 pattern 7 length
*
* the below logic writes out the new
* pattern length for the corresponding
* pattern_count, while masking out the
* other fields
*/
ah->wow_event_mask |= BIT(pattern_count + AR_WOW_PAT_FOUND_SHIFT);
if (!AR_SREV_9285_12_OR_LATER(ah))
return;
if (pattern_count < 4) {
/* Pattern 0-3 uses AR_WOW_LENGTH1 register */
set = (pattern_len & AR_WOW_LENGTH_MAX) <<
AR_WOW_LEN1_SHIFT(pattern_count);
clr = AR_WOW_LENGTH1_MASK(pattern_count);
REG_RMW(ah, AR_WOW_LENGTH1, set, clr);
} else {
/* Pattern 4-7 uses AR_WOW_LENGTH2 register */
set = (pattern_len & AR_WOW_LENGTH_MAX) <<
AR_WOW_LEN2_SHIFT(pattern_count);
clr = AR_WOW_LENGTH2_MASK(pattern_count);
REG_RMW(ah, AR_WOW_LENGTH2, set, clr);
}
}
EXPORT_SYMBOL(ath9k_hw_wow_apply_pattern);
u32 ath9k_hw_wow_wakeup(struct ath_hw *ah)
{
u32 wow_status = 0;
u32 val = 0, rval;
/*
* read the WoW status register to know
* the wakeup reason
*/
rval = REG_READ(ah, AR_WOW_PATTERN);
val = AR_WOW_STATUS(rval);
/*
* mask only the WoW events that we have enabled. Sometimes
* we have spurious WoW events from the AR_WOW_PATTERN
* register. This mask will clean it up.
*/
val &= ah->wow_event_mask;
if (val) {
if (val & AR_WOW_MAGIC_PAT_FOUND)
wow_status |= AH_WOW_MAGIC_PATTERN_EN;
if (AR_WOW_PATTERN_FOUND(val))
wow_status |= AH_WOW_USER_PATTERN_EN;
if (val & AR_WOW_KEEP_ALIVE_FAIL)
wow_status |= AH_WOW_LINK_CHANGE;
if (val & AR_WOW_BEACON_FAIL)
wow_status |= AH_WOW_BEACON_MISS;
}
/*
* set and clear WOW_PME_CLEAR registers for the chip to
* generate next wow signal.
* disable D3 before accessing other registers ?
*/
/* do we need to check the bit value 0x01000000 (7-10) ?? */
REG_RMW(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_WOW_PME_CLR,
AR_PMCTRL_PWR_STATE_D1D3);
/*
* clear all events
*/
REG_WRITE(ah, AR_WOW_PATTERN,
AR_WOW_CLEAR_EVENTS(REG_READ(ah, AR_WOW_PATTERN)));
/*
* tie reset register for AR9002 family of chipsets
* NB: not tieing it back might have some repurcussions.
*/
if (!AR_SREV_9300_20_OR_LATER(ah)) {
REG_SET_BIT(ah, AR_WA, AR_WA_UNTIE_RESET_EN |
AR_WA_POR_SHORT | AR_WA_RESET_EN);
}
/*
* restore the beacon threshold to init value
*/
REG_WRITE(ah, AR_RSSI_THR, INIT_RSSI_THR);
/*
* Restore the way the PCI-E reset, Power-On-Reset, external
* PCIE_POR_SHORT pins are tied to its original value.
* Previously just before WoW sleep, we untie the PCI-E
* reset to our Chip's Power On Reset so that any PCI-E
* reset from the bus will not reset our chip
*/
if (AR_SREV_9280_20_OR_LATER(ah) && ah->is_pciexpress)
ath9k_hw_configpcipowersave(ah, false);
ah->wow_event_mask = 0;
return wow_status;
}
EXPORT_SYMBOL(ath9k_hw_wow_wakeup);
void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable)
{
u32 wow_event_mask;
u32 set, clr;
/*
* wow_event_mask is a mask to the AR_WOW_PATTERN register to
* indicate which WoW events we have enabled. The WoW events
* are from the 'pattern_enable' in this function and
* 'pattern_count' of ath9k_hw_wow_apply_pattern()
*/
wow_event_mask = ah->wow_event_mask;
/*
* Untie Power-on-Reset from the PCI-E-Reset. When we are in
* WOW sleep, we do want the Reset from the PCI-E to disturb
* our hw state
*/
if (ah->is_pciexpress) {
/*
* we need to untie the internal POR (power-on-reset)
* to the external PCI-E reset. We also need to tie
* the PCI-E Phy reset to the PCI-E reset.
*/
if (AR_SREV_9300_20_OR_LATER(ah)) {
set = AR_WA_RESET_EN | AR_WA_POR_SHORT;
clr = AR_WA_UNTIE_RESET_EN | AR_WA_D3_L1_DISABLE;
REG_RMW(ah, AR_WA, set, clr);
} else {
if (AR_SREV_9285(ah) || AR_SREV_9287(ah))
set = AR9285_WA_DEFAULT;
else
set = AR9280_WA_DEFAULT;
/*
* In AR9280 and AR9285, bit 14 in WA register
* (disable L1) should only be set when device
* enters D3 state and be cleared when device
* comes back to D0
*/
if (ah->config.pcie_waen & AR_WA_D3_L1_DISABLE)
set |= AR_WA_D3_L1_DISABLE;
clr = AR_WA_UNTIE_RESET_EN;
set |= AR_WA_RESET_EN | AR_WA_POR_SHORT;
REG_RMW(ah, AR_WA, set, clr);
/*
* for WoW sleep, we reprogram the SerDes so that the
* PLL and CLK REQ are both enabled. This uses more
* power but otherwise WoW sleep is unstable and the
* chip may disappear.
*/
if (AR_SREV_9285_12_OR_LATER(ah))
ath9k_hw_config_serdes_wow_sleep(ah);
}
}
/*
* set the power states appropriately and enable PME
*/
set = AR_PMCTRL_HOST_PME_EN | AR_PMCTRL_PWR_PM_CTRL_ENA |
AR_PMCTRL_AUX_PWR_DET | AR_PMCTRL_WOW_PME_CLR;
/*
* set and clear WOW_PME_CLEAR registers for the chip
* to generate next wow signal.
*/
REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set);
clr = AR_PMCTRL_WOW_PME_CLR;
REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr);
/*
* Setup for:
* - beacon misses
* - magic pattern
* - keep alive timeout
* - pattern matching
*/
/*
* Program default values for pattern backoff, aifs/slot/KAL count,
* beacon miss timeout, KAL timeout, etc.
*/
set = AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF);
REG_SET_BIT(ah, AR_WOW_PATTERN, set);
set = AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) |
AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) |
AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT);
REG_SET_BIT(ah, AR_WOW_COUNT, set);
if (pattern_enable & AH_WOW_BEACON_MISS)
set = AR_WOW_BEACON_TIMO;
/* We are not using beacon miss, program a large value */
else
set = AR_WOW_BEACON_TIMO_MAX;
REG_WRITE(ah, AR_WOW_BCN_TIMO, set);
/*
* Keep alive timo in ms except AR9280
*/
if (!pattern_enable || AR_SREV_9280(ah))
set = AR_WOW_KEEP_ALIVE_NEVER;
else
set = KAL_TIMEOUT * 32;
REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, set);
/*
* Keep alive delay in us. based on 'power on clock',
* therefore in usec
*/
set = KAL_DELAY * 1000;
REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, set);
/*
* Create keep alive pattern to respond to beacons
*/
ath9k_wow_create_keep_alive_pattern(ah);
/*
* Configure MAC WoW Registers
*/
set = 0;
/* Send keep alive timeouts anyway */
clr = AR_WOW_KEEP_ALIVE_AUTO_DIS;
if (pattern_enable & AH_WOW_LINK_CHANGE)
wow_event_mask |= AR_WOW_KEEP_ALIVE_FAIL;
else
set = AR_WOW_KEEP_ALIVE_FAIL_DIS;
/*
* FIXME: For now disable keep alive frame
* failure. This seems to sometimes trigger
* unnecessary wake up with AR9485 chipsets.
*/
set = AR_WOW_KEEP_ALIVE_FAIL_DIS;
REG_RMW(ah, AR_WOW_KEEP_ALIVE, set, clr);
/*
* we are relying on a bmiss failure. ensure we have
* enough threshold to prevent false positives
*/
REG_RMW_FIELD(ah, AR_RSSI_THR, AR_RSSI_THR_BM_THR,
AR_WOW_BMISSTHRESHOLD);
set = 0;
clr = 0;
if (pattern_enable & AH_WOW_BEACON_MISS) {
set = AR_WOW_BEACON_FAIL_EN;
wow_event_mask |= AR_WOW_BEACON_FAIL;
} else {
clr = AR_WOW_BEACON_FAIL_EN;
}
REG_RMW(ah, AR_WOW_BCN_EN, set, clr);
set = 0;
clr = 0;
/*
* Enable the magic packet registers
*/
if (pattern_enable & AH_WOW_MAGIC_PATTERN_EN) {
set = AR_WOW_MAGIC_EN;
wow_event_mask |= AR_WOW_MAGIC_PAT_FOUND;
} else {
clr = AR_WOW_MAGIC_EN;
}
set |= AR_WOW_MAC_INTR_EN;
REG_RMW(ah, AR_WOW_PATTERN, set, clr);
/*
* For AR9285 and later version of chipsets
* enable WoW pattern match for packets less
* than 256 bytes for all patterns
*/
if (AR_SREV_9285_12_OR_LATER(ah))
REG_WRITE(ah, AR_WOW_PATTERN_MATCH_LT_256B,
AR_WOW_PATTERN_SUPPORTED);
/*
* Set the power states appropriately and enable PME
*/
clr = 0;
set = AR_PMCTRL_PWR_STATE_D1D3 | AR_PMCTRL_HOST_PME_EN |
AR_PMCTRL_PWR_PM_CTRL_ENA;
/*
* This is needed for AR9300 chipsets to wake-up
* the host.
*/
if (AR_SREV_9300_20_OR_LATER(ah))
clr = AR_PCIE_PM_CTRL_ENA;
REG_RMW(ah, AR_PCIE_PM_CTRL, set, clr);
if (AR_SREV_9462(ah)) {
/*
* this is needed to prevent the chip waking up
* the host within 3-4 seconds with certain
* platform/BIOS. The fix is to enable
* D1 & D3 to match original definition and
* also match the OTP value. Anyway this
* is more related to SW WOW.
*/
clr = AR_PMCTRL_PWR_STATE_D1D3;
REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr);
set = AR_PMCTRL_PWR_STATE_D1D3_REAL;
REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set);
}
REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM);
if (AR_SREV_9300_20_OR_LATER(ah)) {
/* to bring down WOW power low margin */
set = BIT(13);
REG_SET_BIT(ah, AR_PCIE_PHY_REG3, set);
/* HW WoW */
clr = BIT(5);
REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, clr);
}
ath9k_hw_set_powermode_wow_sleep(ah);
ah->wow_event_mask = wow_event_mask;
}
EXPORT_SYMBOL(ath9k_hw_wow_enable);