694 lines
19 KiB
C
694 lines
19 KiB
C
#ifndef _SMU_H
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#define _SMU_H
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/*
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* Definitions for talking to the SMU chip in newer G5 PowerMacs
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*/
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#ifdef __KERNEL__
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#include <linux/list.h>
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#endif
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#include <linux/types.h>
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/*
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* Known SMU commands
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*
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* Most of what is below comes from looking at the Open Firmware driver,
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* though this is still incomplete and could use better documentation here
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* or there...
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*/
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/*
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* Partition info commands
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*
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* These commands are used to retrieve the sdb-partition-XX datas from
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* the SMU. The length is always 2. First byte is the subcommand code
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* and second byte is the partition ID.
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*
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* The reply is 6 bytes:
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*
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* - 0..1 : partition address
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* - 2 : a byte containing the partition ID
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* - 3 : length (maybe other bits are rest of header ?)
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*
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* The data must then be obtained with calls to another command:
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* SMU_CMD_MISC_ee_GET_DATABLOCK_REC (described below).
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*/
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#define SMU_CMD_PARTITION_COMMAND 0x3e
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#define SMU_CMD_PARTITION_LATEST 0x01
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#define SMU_CMD_PARTITION_BASE 0x02
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#define SMU_CMD_PARTITION_UPDATE 0x03
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/*
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* Fan control
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*
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* This is a "mux" for fan control commands. The command seem to
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* act differently based on the number of arguments. With 1 byte
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* of argument, this seem to be queries for fans status, setpoint,
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* etc..., while with 0xe arguments, we will set the fans speeds.
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*
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* Queries (1 byte arg):
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* ---------------------
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*
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* arg=0x01: read RPM fans status
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* arg=0x02: read RPM fans setpoint
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* arg=0x11: read PWM fans status
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* arg=0x12: read PWM fans setpoint
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*
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* the "status" queries return the current speed while the "setpoint" ones
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* return the programmed/target speed. It _seems_ that the result is a bit
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* mask in the first byte of active/available fans, followed by 6 words (16
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* bits) containing the requested speed.
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*
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* Setpoint (14 bytes arg):
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* ------------------------
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*
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* first arg byte is 0 for RPM fans and 0x10 for PWM. Second arg byte is the
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* mask of fans affected by the command. Followed by 6 words containing the
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* setpoint value for selected fans in the mask (or 0 if mask value is 0)
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*/
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#define SMU_CMD_FAN_COMMAND 0x4a
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/*
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* Battery access
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*
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* Same command number as the PMU, could it be same syntax ?
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*/
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#define SMU_CMD_BATTERY_COMMAND 0x6f
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#define SMU_CMD_GET_BATTERY_INFO 0x00
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/*
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* Real time clock control
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*
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* This is a "mux", first data byte contains the "sub" command.
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* The "RTC" part of the SMU controls the date, time, powerup
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* timer, but also a PRAM
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*
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* Dates are in BCD format on 7 bytes:
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* [sec] [min] [hour] [weekday] [month day] [month] [year]
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* with month being 1 based and year minus 100
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*/
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#define SMU_CMD_RTC_COMMAND 0x8e
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#define SMU_CMD_RTC_SET_PWRUP_TIMER 0x00 /* i: 7 bytes date */
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#define SMU_CMD_RTC_GET_PWRUP_TIMER 0x01 /* o: 7 bytes date */
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#define SMU_CMD_RTC_STOP_PWRUP_TIMER 0x02
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#define SMU_CMD_RTC_SET_PRAM_BYTE_ACC 0x20 /* i: 1 byte (address?) */
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#define SMU_CMD_RTC_SET_PRAM_AUTOINC 0x21 /* i: 1 byte (data?) */
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#define SMU_CMD_RTC_SET_PRAM_LO_BYTES 0x22 /* i: 10 bytes */
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#define SMU_CMD_RTC_SET_PRAM_HI_BYTES 0x23 /* i: 10 bytes */
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#define SMU_CMD_RTC_GET_PRAM_BYTE 0x28 /* i: 1 bytes (address?) */
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#define SMU_CMD_RTC_GET_PRAM_LO_BYTES 0x29 /* o: 10 bytes */
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#define SMU_CMD_RTC_GET_PRAM_HI_BYTES 0x2a /* o: 10 bytes */
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#define SMU_CMD_RTC_SET_DATETIME 0x80 /* i: 7 bytes date */
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#define SMU_CMD_RTC_GET_DATETIME 0x81 /* o: 7 bytes date */
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/*
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* i2c commands
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*
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* To issue an i2c command, first is to send a parameter block to the
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* the SMU. This is a command of type 0x9a with 9 bytes of header
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* eventually followed by data for a write:
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*
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* 0: bus number (from device-tree usually, SMU has lots of busses !)
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* 1: transfer type/format (see below)
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* 2: device address. For combined and combined4 type transfers, this
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* is the "write" version of the address (bit 0x01 cleared)
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* 3: subaddress length (0..3)
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* 4: subaddress byte 0 (or only byte for subaddress length 1)
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* 5: subaddress byte 1
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* 6: subaddress byte 2
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* 7: combined address (device address for combined mode data phase)
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* 8: data length
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*
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* The transfer types are the same good old Apple ones it seems,
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* that is:
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* - 0x00: Simple transfer
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* - 0x01: Subaddress transfer (addr write + data tx, no restart)
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* - 0x02: Combined transfer (addr write + restart + data tx)
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*
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* This is then followed by actual data for a write.
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*
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* At this point, the OF driver seems to have a limitation on transfer
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* sizes of 0xd bytes on reads and 0x5 bytes on writes. I do not know
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* whether this is just an OF limit due to some temporary buffer size
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* or if this is an SMU imposed limit. This driver has the same limitation
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* for now as I use a 0x10 bytes temporary buffer as well
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*
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* Once that is completed, a response is expected from the SMU. This is
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* obtained via a command of type 0x9a with a length of 1 byte containing
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* 0 as the data byte. OF also fills the rest of the data buffer with 0xff's
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* though I can't tell yet if this is actually necessary. Once this command
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* is complete, at this point, all I can tell is what OF does. OF tests
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* byte 0 of the reply:
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* - on read, 0xfe or 0xfc : bus is busy, wait (see below) or nak ?
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* - on read, 0x00 or 0x01 : reply is in buffer (after the byte 0)
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* - on write, < 0 -> failure (immediate exit)
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* - else, OF just exists (without error, weird)
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*
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* So on read, there is this wait-for-busy thing when getting a 0xfc or
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* 0xfe result. OF does a loop of up to 64 retries, waiting 20ms and
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* doing the above again until either the retries expire or the result
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* is no longer 0xfe or 0xfc
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*
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* The Darwin I2C driver is less subtle though. On any non-success status
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* from the response command, it waits 5ms and tries again up to 20 times,
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* it doesn't differentiate between fatal errors or "busy" status.
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*
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* This driver provides an asynchronous paramblock based i2c command
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* interface to be used either directly by low level code or by a higher
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* level driver interfacing to the linux i2c layer. The current
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* implementation of this relies on working timers & timer interrupts
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* though, so be careful of calling context for now. This may be "fixed"
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* in the future by adding a polling facility.
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*/
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#define SMU_CMD_I2C_COMMAND 0x9a
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/* transfer types */
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#define SMU_I2C_TRANSFER_SIMPLE 0x00
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#define SMU_I2C_TRANSFER_STDSUB 0x01
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#define SMU_I2C_TRANSFER_COMBINED 0x02
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/*
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* Power supply control
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*
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* The "sub" command is an ASCII string in the data, the
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* data length is that of the string.
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*
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* The VSLEW command can be used to get or set the voltage slewing.
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* - length 5 (only "VSLEW") : it returns "DONE" and 3 bytes of
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* reply at data offset 6, 7 and 8.
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* - length 8 ("VSLEWxyz") has 3 additional bytes appended, and is
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* used to set the voltage slewing point. The SMU replies with "DONE"
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* I yet have to figure out their exact meaning of those 3 bytes in
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* both cases. They seem to be:
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* x = processor mask
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* y = op. point index
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* z = processor freq. step index
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* I haven't yet deciphered result codes
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*
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*/
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#define SMU_CMD_POWER_COMMAND 0xaa
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#define SMU_CMD_POWER_RESTART "RESTART"
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#define SMU_CMD_POWER_SHUTDOWN "SHUTDOWN"
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#define SMU_CMD_POWER_VOLTAGE_SLEW "VSLEW"
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/*
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* Read ADC sensors
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*
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* This command takes one byte of parameter: the sensor ID (or "reg"
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* value in the device-tree) and returns a 16 bits value
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*/
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#define SMU_CMD_READ_ADC 0xd8
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/* Misc commands
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*
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* This command seem to be a grab bag of various things
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*
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* Parameters:
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* 1: subcommand
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*/
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#define SMU_CMD_MISC_df_COMMAND 0xdf
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/*
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* Sets "system ready" status
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*
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* I did not yet understand how it exactly works or what it does.
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*
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* Guessing from OF code, 0x02 activates the display backlight. Apple uses/used
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* the same codebase for all OF versions. On PowerBooks, this command would
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* enable the backlight. For the G5s, it only activates the front LED. However,
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* don't take this for granted.
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*
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* Parameters:
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* 2: status [0x00, 0x01 or 0x02]
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*/
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#define SMU_CMD_MISC_df_SET_DISPLAY_LIT 0x02
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/*
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* Sets mode of power switch.
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*
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* What this actually does is not yet known. Maybe it enables some interrupt.
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*
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* Parameters:
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* 2: enable power switch? [0x00 or 0x01]
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* 3 (optional): enable nmi? [0x00 or 0x01]
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*
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* Returns:
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* If parameter 2 is 0x00 and parameter 3 is not specified, returns whether
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* NMI is enabled. Otherwise unknown.
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*/
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#define SMU_CMD_MISC_df_NMI_OPTION 0x04
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/* Sets LED dimm offset.
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*
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* The front LED dimms itself during sleep. Its brightness (or, well, the PWM
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* frequency) depends on current time. Therefore, the SMU needs to know the
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* timezone.
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*
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* Parameters:
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* 2-8: unknown (BCD coding)
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*/
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#define SMU_CMD_MISC_df_DIMM_OFFSET 0x99
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/*
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* Version info commands
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*
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* Parameters:
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* 1 (optional): Specifies version part to retrieve
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*
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* Returns:
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* Version value
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*/
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#define SMU_CMD_VERSION_COMMAND 0xea
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#define SMU_VERSION_RUNNING 0x00
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#define SMU_VERSION_BASE 0x01
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#define SMU_VERSION_UPDATE 0x02
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/*
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* Switches
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*
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* These are switches whose status seems to be known to the SMU.
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*
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* Parameters:
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* none
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*
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* Result:
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* Switch bits (ORed, see below)
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*/
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#define SMU_CMD_SWITCHES 0xdc
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/* Switches bits */
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#define SMU_SWITCH_CASE_CLOSED 0x01
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#define SMU_SWITCH_AC_POWER 0x04
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#define SMU_SWITCH_POWER_SWITCH 0x08
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/*
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* Misc commands
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*
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* This command seem to be a grab bag of various things
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*
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* SMU_CMD_MISC_ee_GET_DATABLOCK_REC is used, among others, to
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* transfer blocks of data from the SMU. So far, I've decrypted it's
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* usage to retrieve partition data. In order to do that, you have to
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* break your transfer in "chunks" since that command cannot transfer
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* more than a chunk at a time. The chunk size used by OF is 0xe bytes,
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* but it seems that the darwin driver will let you do 0x1e bytes if
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* your "PMU" version is >= 0x30. You can get the "PMU" version apparently
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* either in the last 16 bits of property "smu-version-pmu" or as the 16
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* bytes at offset 1 of "smu-version-info"
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*
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* For each chunk, the command takes 7 bytes of arguments:
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* byte 0: subcommand code (0x02)
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* byte 1: 0x04 (always, I don't know what it means, maybe the address
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* space to use or some other nicety. It's hard coded in OF)
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* byte 2..5: SMU address of the chunk (big endian 32 bits)
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* byte 6: size to transfer (up to max chunk size)
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*
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* The data is returned directly
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*/
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#define SMU_CMD_MISC_ee_COMMAND 0xee
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#define SMU_CMD_MISC_ee_GET_DATABLOCK_REC 0x02
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/* Retrieves currently used watts.
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*
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* Parameters:
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* 1: 0x03 (Meaning unknown)
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*/
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#define SMU_CMD_MISC_ee_GET_WATTS 0x03
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#define SMU_CMD_MISC_ee_LEDS_CTRL 0x04 /* i: 00 (00,01) [00] */
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#define SMU_CMD_MISC_ee_GET_DATA 0x05 /* i: 00 , o: ?? */
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/*
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* Power related commands
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*
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* Parameters:
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* 1: subcommand
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*/
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#define SMU_CMD_POWER_EVENTS_COMMAND 0x8f
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/* SMU_POWER_EVENTS subcommands */
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enum {
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SMU_PWR_GET_POWERUP_EVENTS = 0x00,
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SMU_PWR_SET_POWERUP_EVENTS = 0x01,
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SMU_PWR_CLR_POWERUP_EVENTS = 0x02,
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SMU_PWR_GET_WAKEUP_EVENTS = 0x03,
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SMU_PWR_SET_WAKEUP_EVENTS = 0x04,
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SMU_PWR_CLR_WAKEUP_EVENTS = 0x05,
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/*
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* Get last shutdown cause
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*
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* Returns:
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* 1 byte (signed char): Last shutdown cause. Exact meaning unknown.
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*/
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SMU_PWR_LAST_SHUTDOWN_CAUSE = 0x07,
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/*
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* Sets or gets server ID. Meaning or use is unknown.
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*
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* Parameters:
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* 2 (optional): Set server ID (1 byte)
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*
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* Returns:
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* 1 byte (server ID?)
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*/
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SMU_PWR_SERVER_ID = 0x08,
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};
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/* Power events wakeup bits */
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enum {
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SMU_PWR_WAKEUP_KEY = 0x01, /* Wake on key press */
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SMU_PWR_WAKEUP_AC_INSERT = 0x02, /* Wake on AC adapter plug */
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SMU_PWR_WAKEUP_AC_CHANGE = 0x04,
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SMU_PWR_WAKEUP_LID_OPEN = 0x08,
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SMU_PWR_WAKEUP_RING = 0x10,
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};
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/*
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* - Kernel side interface -
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*/
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#ifdef __KERNEL__
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/*
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* Asynchronous SMU commands
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*
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* Fill up this structure and submit it via smu_queue_command(),
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* and get notified by the optional done() callback, or because
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* status becomes != 1
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*/
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struct smu_cmd;
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struct smu_cmd
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{
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/* public */
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u8 cmd; /* command */
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int data_len; /* data len */
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int reply_len; /* reply len */
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void *data_buf; /* data buffer */
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void *reply_buf; /* reply buffer */
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int status; /* command status */
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void (*done)(struct smu_cmd *cmd, void *misc);
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void *misc;
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/* private */
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struct list_head link;
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};
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/*
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* Queues an SMU command, all fields have to be initialized
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*/
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extern int smu_queue_cmd(struct smu_cmd *cmd);
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/*
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* Simple command wrapper. This structure embeds a small buffer
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* to ease sending simple SMU commands from the stack
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*/
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struct smu_simple_cmd
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{
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struct smu_cmd cmd;
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u8 buffer[16];
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};
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/*
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* Queues a simple command. All fields will be initialized by that
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* function
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*/
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extern int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
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unsigned int data_len,
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void (*done)(struct smu_cmd *cmd, void *misc),
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void *misc,
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...);
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/*
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* Completion helper. Pass it to smu_queue_simple or as 'done'
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* member to smu_queue_cmd, it will call complete() on the struct
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* completion passed in the "misc" argument
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*/
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extern void smu_done_complete(struct smu_cmd *cmd, void *misc);
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/*
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* Synchronous helpers. Will spin-wait for completion of a command
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*/
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extern void smu_spinwait_cmd(struct smu_cmd *cmd);
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static inline void smu_spinwait_simple(struct smu_simple_cmd *scmd)
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{
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smu_spinwait_cmd(&scmd->cmd);
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}
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/*
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* Poll routine to call if blocked with irqs off
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*/
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extern void smu_poll(void);
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/*
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* Init routine, presence check....
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*/
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extern int smu_init(void);
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extern int smu_present(void);
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struct platform_device;
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extern struct platform_device *smu_get_ofdev(void);
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/*
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* Common command wrappers
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*/
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extern void smu_shutdown(void);
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extern void smu_restart(void);
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struct rtc_time;
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extern int smu_get_rtc_time(struct rtc_time *time, int spinwait);
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extern int smu_set_rtc_time(struct rtc_time *time, int spinwait);
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/*
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* Kernel asynchronous i2c interface
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*/
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#define SMU_I2C_READ_MAX 0x1d
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#define SMU_I2C_WRITE_MAX 0x15
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/* SMU i2c header, exactly matches i2c header on wire */
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struct smu_i2c_param
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{
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u8 bus; /* SMU bus ID (from device tree) */
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u8 type; /* i2c transfer type */
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u8 devaddr; /* device address (includes direction) */
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u8 sublen; /* subaddress length */
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u8 subaddr[3]; /* subaddress */
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u8 caddr; /* combined address, filled by SMU driver */
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u8 datalen; /* length of transfer */
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u8 data[SMU_I2C_READ_MAX]; /* data */
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};
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struct smu_i2c_cmd
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{
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/* public */
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struct smu_i2c_param info;
|
|
void (*done)(struct smu_i2c_cmd *cmd, void *misc);
|
|
void *misc;
|
|
int status; /* 1 = pending, 0 = ok, <0 = fail */
|
|
|
|
/* private */
|
|
struct smu_cmd scmd;
|
|
int read;
|
|
int stage;
|
|
int retries;
|
|
u8 pdata[32];
|
|
struct list_head link;
|
|
};
|
|
|
|
/*
|
|
* Call this to queue an i2c command to the SMU. You must fill info,
|
|
* including info.data for a write, done and misc.
|
|
* For now, no polling interface is provided so you have to use completion
|
|
* callback.
|
|
*/
|
|
extern int smu_queue_i2c(struct smu_i2c_cmd *cmd);
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
|
|
/*
|
|
* - SMU "sdb" partitions informations -
|
|
*/
|
|
|
|
|
|
/*
|
|
* Partition header format
|
|
*/
|
|
struct smu_sdbp_header {
|
|
__u8 id;
|
|
__u8 len;
|
|
__u8 version;
|
|
__u8 flags;
|
|
};
|
|
|
|
|
|
/*
|
|
* demangle 16 and 32 bits integer in some SMU partitions
|
|
* (currently, afaik, this concerns only the FVT partition
|
|
* (0x12)
|
|
*/
|
|
#define SMU_U16_MIX(x) le16_to_cpu(x)
|
|
#define SMU_U32_MIX(x) ((((x) & 0xff00ff00u) >> 8)|(((x) & 0x00ff00ffu) << 8))
|
|
|
|
|
|
/* This is the definition of the SMU sdb-partition-0x12 table (called
|
|
* CPU F/V/T operating points in Darwin). The definition for all those
|
|
* SMU tables should be moved to some separate file
|
|
*/
|
|
#define SMU_SDB_FVT_ID 0x12
|
|
|
|
struct smu_sdbp_fvt {
|
|
__u32 sysclk; /* Base SysClk frequency in Hz for
|
|
* this operating point. Value need to
|
|
* be unmixed with SMU_U32_MIX()
|
|
*/
|
|
__u8 pad;
|
|
__u8 maxtemp; /* Max temp. supported by this
|
|
* operating point
|
|
*/
|
|
|
|
__u16 volts[3]; /* CPU core voltage for the 3
|
|
* PowerTune modes, a mode with
|
|
* 0V = not supported. Value need
|
|
* to be unmixed with SMU_U16_MIX()
|
|
*/
|
|
};
|
|
|
|
/* This partition contains voltage & current sensor calibration
|
|
* informations
|
|
*/
|
|
#define SMU_SDB_CPUVCP_ID 0x21
|
|
|
|
struct smu_sdbp_cpuvcp {
|
|
__u16 volt_scale; /* u4.12 fixed point */
|
|
__s16 volt_offset; /* s4.12 fixed point */
|
|
__u16 curr_scale; /* u4.12 fixed point */
|
|
__s16 curr_offset; /* s4.12 fixed point */
|
|
__s32 power_quads[3]; /* s4.28 fixed point */
|
|
};
|
|
|
|
/* This partition contains CPU thermal diode calibration
|
|
*/
|
|
#define SMU_SDB_CPUDIODE_ID 0x18
|
|
|
|
struct smu_sdbp_cpudiode {
|
|
__u16 m_value; /* u1.15 fixed point */
|
|
__s16 b_value; /* s10.6 fixed point */
|
|
|
|
};
|
|
|
|
/* This partition contains Slots power calibration
|
|
*/
|
|
#define SMU_SDB_SLOTSPOW_ID 0x78
|
|
|
|
struct smu_sdbp_slotspow {
|
|
__u16 pow_scale; /* u4.12 fixed point */
|
|
__s16 pow_offset; /* s4.12 fixed point */
|
|
};
|
|
|
|
/* This partition contains machine specific version information about
|
|
* the sensor/control layout
|
|
*/
|
|
#define SMU_SDB_SENSORTREE_ID 0x25
|
|
|
|
struct smu_sdbp_sensortree {
|
|
__u8 model_id;
|
|
__u8 unknown[3];
|
|
};
|
|
|
|
/* This partition contains CPU thermal control PID informations. So far
|
|
* only single CPU machines have been seen with an SMU, so we assume this
|
|
* carries only informations for those
|
|
*/
|
|
#define SMU_SDB_CPUPIDDATA_ID 0x17
|
|
|
|
struct smu_sdbp_cpupiddata {
|
|
__u8 unknown1;
|
|
__u8 target_temp_delta;
|
|
__u8 unknown2;
|
|
__u8 history_len;
|
|
__s16 power_adj;
|
|
__u16 max_power;
|
|
__s32 gp,gr,gd;
|
|
};
|
|
|
|
|
|
/* Other partitions without known structures */
|
|
#define SMU_SDB_DEBUG_SWITCHES_ID 0x05
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* This returns the pointer to an SMU "sdb" partition data or NULL
|
|
* if not found. The data format is described below
|
|
*/
|
|
extern const struct smu_sdbp_header *smu_get_sdb_partition(int id,
|
|
unsigned int *size);
|
|
|
|
/* Get "sdb" partition data from an SMU satellite */
|
|
extern struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id,
|
|
int id, unsigned int *size);
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
|
|
/*
|
|
* - Userland interface -
|
|
*/
|
|
|
|
/*
|
|
* A given instance of the device can be configured for 2 different
|
|
* things at the moment:
|
|
*
|
|
* - sending SMU commands (default at open() time)
|
|
* - receiving SMU events (not yet implemented)
|
|
*
|
|
* Commands are written with write() of a command block. They can be
|
|
* "driver" commands (for example to switch to event reception mode)
|
|
* or real SMU commands. They are made of a header followed by command
|
|
* data if any.
|
|
*
|
|
* For SMU commands (not for driver commands), you can then read() back
|
|
* a reply. The reader will be blocked or not depending on how the device
|
|
* file is opened. poll() isn't implemented yet. The reply will consist
|
|
* of a header as well, followed by the reply data if any. You should
|
|
* always provide a buffer large enough for the maximum reply data, I
|
|
* recommand one page.
|
|
*
|
|
* It is illegal to send SMU commands through a file descriptor configured
|
|
* for events reception
|
|
*
|
|
*/
|
|
struct smu_user_cmd_hdr
|
|
{
|
|
__u32 cmdtype;
|
|
#define SMU_CMDTYPE_SMU 0 /* SMU command */
|
|
#define SMU_CMDTYPE_WANTS_EVENTS 1 /* switch fd to events mode */
|
|
#define SMU_CMDTYPE_GET_PARTITION 2 /* retrieve an sdb partition */
|
|
|
|
__u8 cmd; /* SMU command byte */
|
|
__u8 pad[3]; /* padding */
|
|
__u32 data_len; /* Length of data following */
|
|
};
|
|
|
|
struct smu_user_reply_hdr
|
|
{
|
|
__u32 status; /* Command status */
|
|
__u32 reply_len; /* Length of data follwing */
|
|
};
|
|
|
|
#endif /* _SMU_H */
|