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iwlwifi: add comments to EEPROM stuff

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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>
This commit is contained in:
Ben Cahill 2007-11-29 11:09:45 +08:00 committed by David S. Miller
parent 7762635547
commit 796083cb1d
4 changed files with 285 additions and 36 deletions
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94
drivers/net/wireless/iwlwifi/iwl-3945-hw.h
View File

@ -85,24 +85,48 @@
#define IWL_RSSI_OFFSET 95
/*
* This file defines EEPROM related constants, enums, and inline functions.
*
* EEPROM related constants, enums, and structures.
*/
/*
* EEPROM access time values:
*
* Driver initiates EEPROM read by writing byte address << 1 to CSR_EEPROM_REG,
* then clearing (with subsequent read/modify/write) CSR_EEPROM_REG bit
* CSR_EEPROM_REG_BIT_CMD (0x2).
* Driver then polls CSR_EEPROM_REG for CSR_EEPROM_REG_READ_VALID_MSK (0x1).
* When polling, wait 10 uSec between polling loops, up to a maximum 5000 uSec.
* Driver reads 16-bit value from bits 31-16 of CSR_EEPROM_REG.
*/
#define IWL_EEPROM_ACCESS_TIMEOUT 5000 /* uSec */
#define IWL_EEPROM_ACCESS_DELAY 10 /* uSec */
/* EEPROM field values */
#define ANTENNA_SWITCH_NORMAL 0
#define ANTENNA_SWITCH_INVERSE 1
/*
* Regulatory channel usage flags in EEPROM struct iwl_eeprom_channel.flags.
*
* IBSS and/or AP operation is allowed *only* on those channels with
* (VALID && IBSS && ACTIVE && !RADAR). This restriction is in place because
* RADAR detection is not supported by the 3945 driver, but is a
* requirement for establishing a new network for legal operation on channels
* requiring RADAR detection or restricting ACTIVE scanning.
*
* NOTE: "WIDE" flag indicates that 20 MHz channel is supported;
* 3945 does not support FAT 40 MHz-wide channels.
*
* NOTE: Using a channel inappropriately will result in a uCode error!
*/
enum {
EEPROM_CHANNEL_VALID = (1 << 0), /* usable for this SKU/geo */
EEPROM_CHANNEL_IBSS = (1 << 1), /* usable as an IBSS channel */
EEPROM_CHANNEL_IBSS = (1 << 1), /* usable as an IBSS channel */
/* Bit 2 Reserved */
EEPROM_CHANNEL_ACTIVE = (1 << 3), /* active scanning allowed */
EEPROM_CHANNEL_RADAR = (1 << 4), /* radar detection required */
EEPROM_CHANNEL_WIDE = (1 << 5),
EEPROM_CHANNEL_NARROW = (1 << 6),
EEPROM_CHANNEL_WIDE = (1 << 5), /* 20 MHz channel okay */
EEPROM_CHANNEL_NARROW = (1 << 6), /* 10 MHz channel, not used */
EEPROM_CHANNEL_DFS = (1 << 7), /* dynamic freq selection candidate */
};
@ -147,6 +171,7 @@ struct iwl3945_eeprom_channel {
* long packets in normal operation to provide feedback as to proper output
* level.
* Data copied from EEPROM.
* DO NOT ALTER THIS STRUCTURE!!!
*/
struct iwl3945_eeprom_txpower_sample {
u8 gain_index; /* index into power (gain) setup table ... */
@ -163,11 +188,11 @@ struct iwl3945_eeprom_txpower_sample {
* DO NOT ALTER THIS STRUCTURE!!!
*/
struct iwl3945_eeprom_txpower_group {
struct iwl3945_eeprom_txpower_sample samples[5]; /* 5 power levels */
struct iwl3945_eeprom_txpower_sample samples[5]; /* 5 power levels */
s32 a, b, c, d, e; /* coefficients for voltage->power
* formula (signed) */
s32 Fa, Fb, Fc, Fd, Fe; /* these modify coeffs based on
* frequency (signed) */
* frequency (signed) */
s8 saturation_power; /* highest power possible by h/w in this
* band */
u8 group_channel; /* "representative" channel # in this band */
@ -189,6 +214,9 @@ struct iwl3945_eeprom_temperature_corr {
u32 Te;
} __attribute__ ((packed));
/*
* EEPROM map
*/
struct iwl3945_eeprom {
u8 reserved0[16];
#define EEPROM_DEVICE_ID (2*0x08) /* 2 bytes */
@ -229,29 +257,67 @@ struct iwl3945_eeprom {
u8 reserved6[42];
#define EEPROM_REGULATORY_SKU_ID (2*0x60) /* 4 bytes */
u8 sku_id[4]; /* abs.ofs: 192 */
/*
* Per-channel regulatory data.
*
* Each channel that *might* be supported by 3945 or 4965 has a fixed location
* in EEPROM containing EEPROM_CHANNEL_* usage flags (LSB) and max regulatory
* txpower (MSB).
*
* Entries immediately below are for 20 MHz channel width. FAT (40 MHz)
* channels (only for 4965, not supported by 3945) appear later in the EEPROM.
*
* 2.4 GHz channels 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
*/
#define EEPROM_REGULATORY_BAND_1 (2*0x62) /* 2 bytes */
u16 band_1_count; /* abs.ofs: 196 */
#define EEPROM_REGULATORY_BAND_1_CHANNELS (2*0x63) /* 28 bytes */
struct iwl3945_eeprom_channel band_1_channels[14]; /* abs.ofs: 196 */
struct iwl3945_eeprom_channel band_1_channels[14]; /* abs.ofs: 196 */
/*
* 4.9 GHz channels 183, 184, 185, 187, 188, 189, 192, 196,
* 5.0 GHz channels 7, 8, 11, 12, 16
* (4915-5080MHz) (none of these is ever supported)
*/
#define EEPROM_REGULATORY_BAND_2 (2*0x71) /* 2 bytes */
u16 band_2_count; /* abs.ofs: 226 */
#define EEPROM_REGULATORY_BAND_2_CHANNELS (2*0x72) /* 26 bytes */
struct iwl3945_eeprom_channel band_2_channels[13]; /* abs.ofs: 228 */
struct iwl3945_eeprom_channel band_2_channels[13]; /* abs.ofs: 228 */
/*
* 5.2 GHz channels 34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
* (5170-5320MHz)
*/
#define EEPROM_REGULATORY_BAND_3 (2*0x7F) /* 2 bytes */
u16 band_3_count; /* abs.ofs: 254 */
#define EEPROM_REGULATORY_BAND_3_CHANNELS (2*0x80) /* 24 bytes */
struct iwl3945_eeprom_channel band_3_channels[12]; /* abs.ofs: 256 */
struct iwl3945_eeprom_channel band_3_channels[12]; /* abs.ofs: 256 */
/*
* 5.5 GHz channels 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
* (5500-5700MHz)
*/
#define EEPROM_REGULATORY_BAND_4 (2*0x8C) /* 2 bytes */
u16 band_4_count; /* abs.ofs: 280 */
#define EEPROM_REGULATORY_BAND_4_CHANNELS (2*0x8D) /* 22 bytes */
struct iwl3945_eeprom_channel band_4_channels[11]; /* abs.ofs: 282 */
struct iwl3945_eeprom_channel band_4_channels[11]; /* abs.ofs: 282 */
/*
* 5.7 GHz channels 145, 149, 153, 157, 161, 165
* (5725-5825MHz)
*/
#define EEPROM_REGULATORY_BAND_5 (2*0x98) /* 2 bytes */
u16 band_5_count; /* abs.ofs: 304 */
#define EEPROM_REGULATORY_BAND_5_CHANNELS (2*0x99) /* 12 bytes */
struct iwl3945_eeprom_channel band_5_channels[6]; /* abs.ofs: 306 */
struct iwl3945_eeprom_channel band_5_channels[6]; /* abs.ofs: 306 */
u8 reserved9[194];
/*
* 3945 Txpower calibration data.
*/
#define EEPROM_TXPOWER_CALIB_GROUP0 0x200
#define EEPROM_TXPOWER_CALIB_GROUP1 0x240
#define EEPROM_TXPOWER_CALIB_GROUP2 0x280
@ -261,12 +327,14 @@ struct iwl3945_eeprom {
struct iwl3945_eeprom_txpower_group groups[IWL_NUM_TX_CALIB_GROUPS];
/* abs.ofs: 512 */
#define EEPROM_CALIB_TEMPERATURE_CORRECT 0x340
struct iwl3945_eeprom_temperature_corr corrections; /* abs.ofs: 832 */
struct iwl3945_eeprom_temperature_corr corrections; /* abs.ofs: 832 */
u8 reserved16[172]; /* fill out to full 1024 byte block */
} __attribute__ ((packed));
#define IWL_EEPROM_IMAGE_SIZE 1024
/* End of EEPROM */
#include "iwl-3945-commands.h"

9
drivers/net/wireless/iwlwifi/iwl-3945.c
View File

@ -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);

209
drivers/net/wireless/iwlwifi/iwl-4965-hw.h
View File

@ -85,24 +85,50 @@
#define IWL_RSSI_OFFSET 44
/*
* This file defines EEPROM related constants, enums, and inline functions.
*
* EEPROM related constants, enums, and structures.
*/
/*
* EEPROM access time values:
*
* Driver initiates EEPROM read by writing byte address << 1 to CSR_EEPROM_REG,
* then clearing (with subsequent read/modify/write) CSR_EEPROM_REG bit
* CSR_EEPROM_REG_BIT_CMD (0x2).
* Driver then polls CSR_EEPROM_REG for CSR_EEPROM_REG_READ_VALID_MSK (0x1).
* When polling, wait 10 uSec between polling loops, up to a maximum 5000 uSec.
* Driver reads 16-bit value from bits 31-16 of CSR_EEPROM_REG.
*/
#define IWL_EEPROM_ACCESS_TIMEOUT 5000 /* uSec */
#define IWL_EEPROM_ACCESS_DELAY 10 /* uSec */
/* EEPROM field values */
#define ANTENNA_SWITCH_NORMAL 0
#define ANTENNA_SWITCH_INVERSE 1
/*
* Regulatory channel usage flags in EEPROM struct iwl4965_eeprom_channel.flags.
*
* IBSS and/or AP operation is allowed *only* on those channels with
* (VALID && IBSS && ACTIVE && !RADAR). This restriction is in place because
* RADAR detection is not supported by the 4965 driver, but is a
* requirement for establishing a new network for legal operation on channels
* requiring RADAR detection or restricting ACTIVE scanning.
*
* NOTE: "WIDE" flag does not indicate anything about "FAT" 40 MHz channels.
* It only indicates that 20 MHz channel use is supported; FAT channel
* usage is indicated by a separate set of regulatory flags for each
* FAT channel pair.
*
* NOTE: Using a channel inappropriately will result in a uCode error!
*/
enum {
EEPROM_CHANNEL_VALID = (1 << 0), /* usable for this SKU/geo */
EEPROM_CHANNEL_IBSS = (1 << 1), /* usable as an IBSS channel */
EEPROM_CHANNEL_IBSS = (1 << 1), /* usable as an IBSS channel */
/* Bit 2 Reserved */
EEPROM_CHANNEL_ACTIVE = (1 << 3), /* active scanning allowed */
EEPROM_CHANNEL_RADAR = (1 << 4), /* radar detection required */
EEPROM_CHANNEL_WIDE = (1 << 5),
EEPROM_CHANNEL_NARROW = (1 << 6),
EEPROM_CHANNEL_WIDE = (1 << 5), /* 20 MHz channel okay */
EEPROM_CHANNEL_NARROW = (1 << 6), /* 10 MHz channel, not used */
EEPROM_CHANNEL_DFS = (1 << 7), /* dynamic freq selection candidate */
};
@ -136,9 +162,10 @@ enum {
#define EEPROM_SKU_CAP_HW_RF_KILL_ENABLE (1 << 1)
#define EEPROM_SKU_CAP_OP_MODE_MRC (1 << 7)
/* *regulatory* channel data from eeprom, one for each channel */
/* *regulatory* channel data format in eeprom, one for each channel.
* There are separate entries for FAT (40 MHz) vs. normal (20 MHz) channels. */
struct iwl4965_eeprom_channel {
u8 flags; /* flags copied from EEPROM */
u8 flags; /* EEPROM_CHANNEL_* flags copied from EEPROM */
s8 max_power_avg; /* max power (dBm) on this chnl, limit 31 */
} __attribute__ ((packed));
@ -193,44 +220,112 @@ struct iwl4965_eeprom_temperature_corr {
u32 Te;
} __attribute__ ((packed));
/* 4965 has two radio transmitters (and 3 radio receivers) */
#define EEPROM_TX_POWER_TX_CHAINS (2)
/* 4965 has room for up to 8 sets of txpower calibration data */
#define EEPROM_TX_POWER_BANDS (8)
/* 4965 factory calibration measures txpower gain settings for
* each of 3 target output levels */
#define EEPROM_TX_POWER_MEASUREMENTS (3)
#define EEPROM_TX_POWER_VERSION (2)
/* 4965 driver does not work with txpower calibration version < 5.
* Look for this in calib_version member of struct iwl4965_eeprom. */
#define EEPROM_TX_POWER_VERSION_NEW (5)
/*
* 4965 factory calibration data for one txpower level, on one channel,
* measured on one of the 2 tx chains (radio transmitter and associated
* antenna). EEPROM contains:
*
* 1) Temperature (degrees Celsius) of device when measurement was made.
*
* 2) Gain table index used to achieve the target measurement power.
* This refers to the "well-known" gain tables (see iwl-4965-hw.h).
*
* 3) Actual measured output power, in half-dBm ("34" = 17 dBm).
*
* 4) RF power amplifier detector level measurement (not used).
*/
struct iwl4965_eeprom_calib_measure {
u8 temperature;
u8 gain_idx;
u8 actual_pow;
s8 pa_det;
u8 temperature; /* Device temperature (Celsius) */
u8 gain_idx; /* Index into gain table */
u8 actual_pow; /* Measured RF output power, half-dBm */
s8 pa_det; /* Power amp detector level (not used) */
} __attribute__ ((packed));
/*
* 4965 measurement set for one channel. EEPROM contains:
*
* 1) Channel number measured
*
* 2) Measurements for each of 3 power levels for each of 2 radio transmitters
* (a.k.a. "tx chains") (6 measurements altogether)
*/
struct iwl4965_eeprom_calib_ch_info {
u8 ch_num;
struct iwl4965_eeprom_calib_measure measurements[EEPROM_TX_POWER_TX_CHAINS]
[EEPROM_TX_POWER_MEASUREMENTS];
} __attribute__ ((packed));
/*
* 4965 txpower subband info.
*
* For each frequency subband, EEPROM contains the following:
*
* 1) First and last channels within range of the subband. "0" values
* indicate that this sample set is not being used.
*
* 2) Sample measurement sets for 2 channels close to the range endpoints.
*/
struct iwl4965_eeprom_calib_subband_info {
u8 ch_from;
u8 ch_to;
u8 ch_from; /* channel number of lowest channel in subband */
u8 ch_to; /* channel number of highest channel in subband */
struct iwl4965_eeprom_calib_ch_info ch1;
struct iwl4965_eeprom_calib_ch_info ch2;
} __attribute__ ((packed));
/*
* 4965 txpower calibration info. EEPROM contains:
*
* 1) Factory-measured saturation power levels (maximum levels at which
* tx power amplifier can output a signal without too much distortion).
* There is one level for 2.4 GHz band and one for 5 GHz band. These
* values apply to all channels within each of the bands.
*
* 2) Factory-measured power supply voltage level. This is assumed to be
* constant (i.e. same value applies to all channels/bands) while the
* factory measurements are being made.
*
* 3) Up to 8 sets of factory-measured txpower calibration values.
* These are for different frequency ranges, since txpower gain
* characteristics of the analog radio circuitry vary with frequency.
*
* Not all sets need to be filled with data;
* struct iwl4965_eeprom_calib_subband_info contains range of channels
* (0 if unused) for each set of data.
*/
struct iwl4965_eeprom_calib_info {
u8 saturation_power24;
u8 saturation_power52;
u8 saturation_power24; /* half-dBm (e.g. "34" = 17 dBm) */
u8 saturation_power52; /* half-dBm */
s16 voltage; /* signed */
struct iwl4965_eeprom_calib_subband_info band_info[EEPROM_TX_POWER_BANDS];
} __attribute__ ((packed));
/*
* 4965 EEPROM map
*/
struct iwl4965_eeprom {
u8 reserved0[16];
#define EEPROM_DEVICE_ID (2*0x08) /* 2 bytes */
u16 device_id; /* abs.ofs: 16 */
u16 device_id; /* abs.ofs: 16 */
u8 reserved1[2];
#define EEPROM_PMC (2*0x0A) /* 2 bytes */
u16 pmc; /* abs.ofs: 20 */
@ -273,40 +368,107 @@ struct iwl4965_eeprom {
u8 reserved8[10];
#define EEPROM_REGULATORY_SKU_ID (2*0x60) /* 4 bytes */
u8 sku_id[4]; /* abs.ofs: 192 */
/*
* Per-channel regulatory data.
*
* Each channel that *might* be supported by 3945 or 4965 has a fixed location
* in EEPROM containing EEPROM_CHANNEL_* usage flags (LSB) and max regulatory
* txpower (MSB).
*
* Entries immediately below are for 20 MHz channel width. FAT (40 MHz)
* channels (only for 4965, not supported by 3945) appear later in the EEPROM.
*
* 2.4 GHz channels 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
*/
#define EEPROM_REGULATORY_BAND_1 (2*0x62) /* 2 bytes */
u16 band_1_count; /* abs.ofs: 196 */
#define EEPROM_REGULATORY_BAND_1_CHANNELS (2*0x63) /* 28 bytes */
struct iwl4965_eeprom_channel band_1_channels[14]; /* abs.ofs: 196 */
struct iwl4965_eeprom_channel band_1_channels[14]; /* abs.ofs: 196 */
/*
* 4.9 GHz channels 183, 184, 185, 187, 188, 189, 192, 196,
* 5.0 GHz channels 7, 8, 11, 12, 16
* (4915-5080MHz) (none of these is ever supported)
*/
#define EEPROM_REGULATORY_BAND_2 (2*0x71) /* 2 bytes */
u16 band_2_count; /* abs.ofs: 226 */
#define EEPROM_REGULATORY_BAND_2_CHANNELS (2*0x72) /* 26 bytes */
struct iwl4965_eeprom_channel band_2_channels[13]; /* abs.ofs: 228 */
struct iwl4965_eeprom_channel band_2_channels[13]; /* abs.ofs: 228 */
/*
* 5.2 GHz channels 34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
* (5170-5320MHz)
*/
#define EEPROM_REGULATORY_BAND_3 (2*0x7F) /* 2 bytes */
u16 band_3_count; /* abs.ofs: 254 */
#define EEPROM_REGULATORY_BAND_3_CHANNELS (2*0x80) /* 24 bytes */
struct iwl4965_eeprom_channel band_3_channels[12]; /* abs.ofs: 256 */
struct iwl4965_eeprom_channel band_3_channels[12]; /* abs.ofs: 256 */
/*
* 5.5 GHz channels 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
* (5500-5700MHz)
*/
#define EEPROM_REGULATORY_BAND_4 (2*0x8C) /* 2 bytes */
u16 band_4_count; /* abs.ofs: 280 */
#define EEPROM_REGULATORY_BAND_4_CHANNELS (2*0x8D) /* 22 bytes */
struct iwl4965_eeprom_channel band_4_channels[11]; /* abs.ofs: 282 */
struct iwl4965_eeprom_channel band_4_channels[11]; /* abs.ofs: 282 */
/*
* 5.7 GHz channels 145, 149, 153, 157, 161, 165
* (5725-5825MHz)
*/
#define EEPROM_REGULATORY_BAND_5 (2*0x98) /* 2 bytes */
u16 band_5_count; /* abs.ofs: 304 */
#define EEPROM_REGULATORY_BAND_5_CHANNELS (2*0x99) /* 12 bytes */
struct iwl4965_eeprom_channel band_5_channels[6]; /* abs.ofs: 306 */
struct iwl4965_eeprom_channel band_5_channels[6]; /* abs.ofs: 306 */
u8 reserved10[2];
/*
* 2.4 GHz FAT channels 1 (5), 2 (6), 3 (7), 4 (8), 5 (9), 6 (10), 7 (11)
*
* The channel listed is the center of the lower 20 MHz half of the channel.
* The overall center frequency is actually 2 channels (10 MHz) above that,
* and the upper half of each FAT channel is centered 4 channels (20 MHz) away
* from the lower half; e.g. the upper half of FAT channel 1 is channel 5,
* and the overall FAT channel width centers on channel 3.
*
* NOTE: The RXON command uses 20 MHz channel numbers to specify the
* control channel to which to tune. RXON also specifies whether the
* control channel is the upper or lower half of a FAT channel.
*
* NOTE: 4965 does not support FAT channels on 2.4 GHz.
*/
#define EEPROM_REGULATORY_BAND_24_FAT_CHANNELS (2*0xA0) /* 14 bytes */
struct iwl4965_eeprom_channel band_24_channels[7]; /* abs.ofs: 320 */
struct iwl4965_eeprom_channel band_24_channels[7]; /* abs.ofs: 320 */
u8 reserved11[2];
/*
* 5.2 GHz FAT channels 36 (40), 44 (48), 52 (56), 60 (64),
* 100 (104), 108 (112), 116 (120), 124 (128), 132 (136), 149 (153), 157 (161)
*/
#define EEPROM_REGULATORY_BAND_52_FAT_CHANNELS (2*0xA8) /* 22 bytes */
struct iwl4965_eeprom_channel band_52_channels[11]; /* abs.ofs: 336 */
struct iwl4965_eeprom_channel band_52_channels[11]; /* abs.ofs: 336 */
u8 reserved12[6];
/*
* 4965 driver requires txpower calibration format version 5 or greater.
* Driver does not work with txpower calibration version < 5.
* This value is simply a 16-bit number, no major/minor versions here.
*/
#define EEPROM_CALIB_VERSION_OFFSET (2*0xB6) /* 2 bytes */
u16 calib_version; /* abs.ofs: 364 */
u8 reserved13[2];
#define EEPROM_SATURATION_POWER_OFFSET (2*0xB8) /* 2 bytes */
u16 satruation_power; /* abs.ofs: 368 */
u8 reserved14[94];
/*
* 4965 Txpower calibration data.
*/
#define EEPROM_IWL_CALIB_TXPOWER_OFFSET (2*0xE8) /* 48 bytes */
struct iwl4965_eeprom_calib_info calib_info; /* abs.ofs: 464 */
@ -317,6 +479,7 @@ struct iwl4965_eeprom {
#define IWL_EEPROM_IMAGE_SIZE 1024
/* End of EEPROM */
#include "iwl-4965-commands.h"

9
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -4687,14 +4687,23 @@ struct pci_device_id iwl4965_hw_card_ids[] = {
{0}
};
/*
* The device's EEPROM semaphore prevents conflicts between driver and uCode
* when accessing the EEPROM; each access 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 the semaphore.
*/
int iwl4965_eeprom_acquire_semaphore(struct iwl4965_priv *priv)
{
u16 count;
int rc;
for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
/* Request semaphore */
iwl4965_set_bit(priv, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
/* See if we got it */
rc = iwl4965_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,