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linux/drivers/net/wireless/iwlwifi/dvm/power.c
Johannes Berg 26a7ca9a71 iwlwifi: refactor EEPROM reading/parsing 
The EEPROM reading/parsing code is all mixed in
the driver today, and the EEPROM is parsed only
when we access data from it. This is problematic
because the NVM needs to be parsed and that is
independent of reading it. Also, the NVM format
for new devices will be different and probably
require a new parser.

Therefore refactor the reading and parsing and
create two independent components. Reading the
EEPROM requires direct hardware accesses and
therefore access to the transport, but parsing
is independent and can be done on an NVM blob.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2012-06-06 13:24:19 +02:00

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/******************************************************************************
*
* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
*
* Portions of this file are derived from the ipw3945 project, as well
* as portions of the ieee80211 subsystem header files.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <net/mac80211.h>
#include "iwl-io.h"
#include "iwl-debug.h"
#include "iwl-trans.h"
#include "iwl-modparams.h"
#include "dev.h"
#include "agn.h"
#include "commands.h"
#include "power.h"
/*
* Setting power level allows the card to go to sleep when not busy.
*
* We calculate a sleep command based on the required latency, which
* we get from mac80211. In order to handle thermal throttling, we can
* also use pre-defined power levels.
*/
/*
* This defines the old power levels. They are still used by default
* (level 1) and for thermal throttle (levels 3 through 5)
*/
struct iwl_power_vec_entry {
struct iwl_powertable_cmd cmd;
u8 no_dtim; /* number of skip dtim */
};
#define IWL_DTIM_RANGE_0_MAX 2
#define IWL_DTIM_RANGE_1_MAX 10
#define NOSLP cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK | \
IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
IWL_POWER_ADVANCE_PM_ENA_MSK)
#define ASLP_TOUT(T) cpu_to_le32(T)
#define TU_TO_USEC 1024
#define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
cpu_to_le32(X1), \
cpu_to_le32(X2), \
cpu_to_le32(X3), \
cpu_to_le32(X4)}
/* default power management (not Tx power) table values */
/* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
/* DTIM 0 - 2 */
static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
};
/* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
/* DTIM 3 - 10 */
static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
};
/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
/* DTIM 11 - */
static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};
/* advance power management */
/* DTIM 0 - 2 */
static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
};
/* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
/* DTIM 3 - 10 */
static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
};
/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
/* DTIM 11 - */
static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
};
static void iwl_static_sleep_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd,
enum iwl_power_level lvl, int period)
{
const struct iwl_power_vec_entry *table;
int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
int i;
u8 skip;
u32 slp_itrvl;
if (priv->cfg->adv_pm) {
table = apm_range_2;
if (period <= IWL_DTIM_RANGE_1_MAX)
table = apm_range_1;
if (period <= IWL_DTIM_RANGE_0_MAX)
table = apm_range_0;
} else {
table = range_2;
if (period <= IWL_DTIM_RANGE_1_MAX)
table = range_1;
if (period <= IWL_DTIM_RANGE_0_MAX)
table = range_0;
}
if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
memset(cmd, 0, sizeof(*cmd));
else
*cmd = table[lvl].cmd;
if (period == 0) {
skip = 0;
period = 1;
for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
max_sleep[i] = 1;
} else {
skip = table[lvl].no_dtim;
for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
}
slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
/* figure out the listen interval based on dtim period and skip */
if (slp_itrvl == 0xFF)
cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
cpu_to_le32(period * (skip + 1));
slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
if (slp_itrvl > period)
cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
cpu_to_le32((slp_itrvl / period) * period);
if (skip)
cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
else
cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
if (priv->cfg->base_params->shadow_reg_enable)
cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
else
cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
if (iwl_advanced_bt_coexist(priv)) {
if (!priv->cfg->bt_params->bt_sco_disable)
cmd->flags |= IWL_POWER_BT_SCO_ENA;
else
cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
}
slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
/* enforce max sleep interval */
for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
if (le32_to_cpu(cmd->sleep_interval[i]) >
(max_sleep[i] * period))
cmd->sleep_interval[i] =
cpu_to_le32(max_sleep[i] * period);
if (i != (IWL_POWER_VEC_SIZE - 1)) {
if (le32_to_cpu(cmd->sleep_interval[i]) >
le32_to_cpu(cmd->sleep_interval[i+1]))
cmd->sleep_interval[i] =
cmd->sleep_interval[i+1];
}
}
if (priv->power_data.bus_pm)
cmd->flags |= IWL_POWER_PCI_PM_MSK;
else
cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
skip, period);
/* The power level here is 0-4 (used as array index), but user expects
to see 1-5 (according to spec). */
IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
}
static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd)
{
memset(cmd, 0, sizeof(*cmd));
if (priv->power_data.bus_pm)
cmd->flags |= IWL_POWER_PCI_PM_MSK;
IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
}
static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
{
IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
le32_to_cpu(cmd->sleep_interval[0]),
le32_to_cpu(cmd->sleep_interval[1]),
le32_to_cpu(cmd->sleep_interval[2]),
le32_to_cpu(cmd->sleep_interval[3]),
le32_to_cpu(cmd->sleep_interval[4]));
return iwl_dvm_send_cmd_pdu(priv, POWER_TABLE_CMD, CMD_SYNC,
sizeof(struct iwl_powertable_cmd), cmd);
}
static void iwl_power_build_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd)
{
bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
int dtimper;
dtimper = priv->hw->conf.ps_dtim_period ?: 1;
if (priv->wowlan)
iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
else if (!priv->cfg->base_params->no_idle_support &&
priv->hw->conf.flags & IEEE80211_CONF_IDLE)
iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
else if (iwl_tt_is_low_power_state(priv)) {
/* in thermal throttling low power state */
iwl_static_sleep_cmd(priv, cmd,
iwl_tt_current_power_mode(priv), dtimper);
} else if (!enabled)
iwl_power_sleep_cam_cmd(priv, cmd);
else if (priv->power_data.debug_sleep_level_override >= 0)
iwl_static_sleep_cmd(priv, cmd,
priv->power_data.debug_sleep_level_override,
dtimper);
else {
/* Note that the user parameter is 1-5 (according to spec),
but we pass 0-4 because it acts as an array index. */
if (iwlwifi_mod_params.power_level > IWL_POWER_INDEX_1 &&
iwlwifi_mod_params.power_level <= IWL_POWER_NUM)
iwl_static_sleep_cmd(priv, cmd,
iwlwifi_mod_params.power_level - 1, dtimper);
else
iwl_static_sleep_cmd(priv, cmd,
IWL_POWER_INDEX_1, dtimper);
}
}
int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
bool force)
{
int ret;
bool update_chains;
lockdep_assert_held(&priv->mutex);
/* Don't update the RX chain when chain noise calibration is running */
update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
return 0;
if (!iwl_is_ready_rf(priv))
return -EIO;
/* scan complete use sleep_power_next, need to be updated */
memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
return 0;
}
if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
iwl_dvm_set_pmi(priv, true);
ret = iwl_set_power(priv, cmd);
if (!ret) {
if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
iwl_dvm_set_pmi(priv, false);
if (update_chains)
iwl_update_chain_flags(priv);
else
IWL_DEBUG_POWER(priv,
"Cannot update the power, chain noise "
"calibration running: %d\n",
priv->chain_noise_data.state);
memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
} else
IWL_ERR(priv, "set power fail, ret = %d", ret);
return ret;
}
int iwl_power_update_mode(struct iwl_priv *priv, bool force)
{
struct iwl_powertable_cmd cmd;
iwl_power_build_cmd(priv, &cmd);
return iwl_power_set_mode(priv, &cmd, force);
}
/* initialize to default */
void iwl_power_initialize(struct iwl_priv *priv)
{
priv->power_data.bus_pm = priv->trans->pm_support;
priv->power_data.debug_sleep_level_override = -1;
memset(&priv->power_data.sleep_cmd, 0,
sizeof(priv->power_data.sleep_cmd));
}
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