/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SMU_H
#define _SMU_H
/*
* Definitions for talking to the SMU chip in newer G5 PowerMacs
*/
#ifdef __KERNEL__
#include <linux/list.h>
#endif
#include <linux/types.h>
/*
* Known SMU commands
*
* Most of what is below comes from looking at the Open Firmware driver,
* though this is still incomplete and could use better documentation here
* or there...
*/
/*
* Partition info commands
*
* These commands are used to retrieve the sdb-partition-XX datas from
* the SMU. The length is always 2. First byte is the subcommand code
* and second byte is the partition ID.
*
* The reply is 6 bytes:
*
* - 0..1 : partition address
* - 2 : a byte containing the partition ID
* - 3 : length (maybe other bits are rest of header ?)
*
* The data must then be obtained with calls to another command:
* SMU_CMD_MISC_ee_GET_DATABLOCK_REC (described below).
*/
#define SMU_CMD_PARTITION_COMMAND 0x3e
#define SMU_CMD_PARTITION_LATEST 0x01
#define SMU_CMD_PARTITION_BASE 0x02
#define SMU_CMD_PARTITION_UPDATE 0x03
/*
* Fan control
*
* This is a "mux" for fan control commands. The command seem to
* act differently based on the number of arguments. With 1 byte
* of argument, this seem to be queries for fans status, setpoint,
* etc..., while with 0xe arguments, we will set the fans speeds.
*
* Queries (1 byte arg):
* ---------------------
*
* arg=0x01: read RPM fans status
* arg=0x02: read RPM fans setpoint
* arg=0x11: read PWM fans status
* arg=0x12: read PWM fans setpoint
*
* the "status" queries return the current speed while the "setpoint" ones
* return the programmed/target speed. It _seems_ that the result is a bit
* mask in the first byte of active/available fans, followed by 6 words (16
* bits) containing the requested speed.
*
* Setpoint (14 bytes arg):
* ------------------------
*
* first arg byte is 0 for RPM fans and 0x10 for PWM. Second arg byte is the
* mask of fans affected by the command. Followed by 6 words containing the
* setpoint value for selected fans in the mask (or 0 if mask value is 0)
*/
#define SMU_CMD_FAN_COMMAND 0x4a
/*
* Battery access
*
* Same command number as the PMU, could it be same syntax ?
*/
#define SMU_CMD_BATTERY_COMMAND 0x6f
#define SMU_CMD_GET_BATTERY_INFO 0x00
/*
* Real time clock control
*
* This is a "mux", first data byte contains the "sub" command.
* The "RTC" part of the SMU controls the date, time, powerup
* timer, but also a PRAM
*
* Dates are in BCD format on 7 bytes:
* [sec] [min] [hour] [weekday] [month day] [month] [year]
* with month being 1 based and year minus 100
*/
#define SMU_CMD_RTC_COMMAND 0x8e
#define SMU_CMD_RTC_SET_PWRUP_TIMER 0x00 /* i: 7 bytes date */
#define SMU_CMD_RTC_GET_PWRUP_TIMER 0x01 /* o: 7 bytes date */
#define SMU_CMD_RTC_STOP_PWRUP_TIMER 0x02
#define SMU_CMD_RTC_SET_PRAM_BYTE_ACC 0x20 /* i: 1 byte (address?) */
#define SMU_CMD_RTC_SET_PRAM_AUTOINC 0x21 /* i: 1 byte (data?) */
#define SMU_CMD_RTC_SET_PRAM_LO_BYTES 0x22 /* i: 10 bytes */
#define SMU_CMD_RTC_SET_PRAM_HI_BYTES 0x23 /* i: 10 bytes */
#define SMU_CMD_RTC_GET_PRAM_BYTE 0x28 /* i: 1 bytes (address?) */
#define SMU_CMD_RTC_GET_PRAM_LO_BYTES 0x29 /* o: 10 bytes */
#define SMU_CMD_RTC_GET_PRAM_HI_BYTES 0x2a /* o: 10 bytes */
#define SMU_CMD_RTC_SET_DATETIME 0x80 /* i: 7 bytes date */
#define SMU_CMD_RTC_GET_DATETIME 0x81 /* o: 7 bytes date */
/*
* i2c commands
*
* To issue an i2c command, first is to send a parameter block to
* the SMU. This is a command of type 0x9a with 9 bytes of header
* eventually followed by data for a write:
*
* 0: bus number (from device-tree usually, SMU has lots of busses !)
* 1: transfer type/format (see below)
* 2: device address. For combined and combined4 type transfers, this
* is the "write" version of the address (bit 0x01 cleared)
* 3: subaddress length (0..3)
* 4: subaddress byte 0 (or only byte for subaddress length 1)
* 5: subaddress byte 1
* 6: subaddress byte 2
* 7: combined address (device address for combined mode data phase)
* 8: data length
*
* The transfer types are the same good old Apple ones it seems,
* that is:
* - 0x00: Simple transfer
* - 0x01: Subaddress transfer (addr write + data tx, no restart)
* - 0x02: Combined transfer (addr write + restart + data tx)
*
* This is then followed by actual data for a write.
*
* At this point, the OF driver seems to have a limitation on transfer
* sizes of 0xd bytes on reads and 0x5 bytes on writes. I do not know
* whether this is just an OF limit due to some temporary buffer size
* or if this is an SMU imposed limit. This driver has the same limitation
* for now as I use a 0x10 bytes temporary buffer as well
*
* Once that is completed, a response is expected from the SMU. This is
* obtained via a command of type 0x9a with a length of 1 byte containing
* 0 as the data byte. OF also fills the rest of the data buffer with 0xff's
* though I can't tell yet if this is actually necessary. Once this command
* is complete, at this point, all I can tell is what OF does. OF tests
* byte 0 of the reply:
* - on read, 0xfe or 0xfc : bus is busy, wait (see below) or nak ?
* - on read, 0x00 or 0x01 : reply is in buffer (after the byte 0)
* - on write, < 0 -> failure (immediate exit)
* - else, OF just exists (without error, weird)
*
* So on read, there is this wait-for-busy thing when getting a 0xfc or
* 0xfe result. OF does a loop of up to 64 retries, waiting 20ms and
* doing the above again until either the retries expire or the result
* is no longer 0xfe or 0xfc
*
* The Darwin I2C driver is less subtle though. On any non-success status
* from the response command, it waits 5ms and tries again up to 20 times,
* it doesn't differentiate between fatal errors or "busy" status.
*
* This driver provides an asynchronous paramblock based i2c command
* interface to be used either directly by low level code or by a higher
* level driver interfacing to the linux i2c layer. The current
* implementation of this relies on working timers & timer interrupts
* though, so be careful of calling context for now. This may be "fixed"
* in the future by adding a polling facility.
*/
#define SMU_CMD_I2C_COMMAND 0x9a
/* transfer types */
#define SMU_I2C_TRANSFER_SIMPLE 0x00
#define SMU_I2C_TRANSFER_STDSUB 0x01
#define SMU_I2C_TRANSFER_COMBINED 0x02
/*
* Power supply control
*
* The "sub" command is an ASCII string in the data, the
* data length is that of the string.
*
* The VSLEW command can be used to get or set the voltage slewing.
* - length 5 (only "VSLEW") : it returns "DONE" and 3 bytes of
* reply at data offset 6, 7 and 8.
* - length 8 ("VSLEWxyz") has 3 additional bytes appended, and is
* used to set the voltage slewing point. The SMU replies with "DONE"
* I yet have to figure out their exact meaning of those 3 bytes in
* both cases. They seem to be:
* x = processor mask
* y = op. point index
* z = processor freq. step index
* I haven't yet deciphered result codes
*
*/
#define SMU_CMD_POWER_COMMAND 0xaa
#define SMU_CMD_POWER_RESTART "RESTART"
#define SMU_CMD_POWER_SHUTDOWN "SHUTDOWN"
#define SMU_CMD_POWER_VOLTAGE_SLEW "VSLEW"
/*
* Read ADC sensors
*
* This command takes one byte of parameter: the sensor ID (or "reg"
* value in the device-tree) and returns a 16 bits value
*/
#define SMU_CMD_READ_ADC 0xd8
/* Misc commands
*
* This command seem to be a grab bag of various things
*
* Parameters:
* 1: subcommand
*/
#define SMU_CMD_MISC_df_COMMAND 0xdf
/*
* Sets "system ready" status
*
* I did not yet understand how it exactly works or what it does.
*
* Guessing from OF code, 0x02 activates the display backlight. Apple uses/used
* the same codebase for all OF versions. On PowerBooks, this command would
* enable the backlight. For the G5s, it only activates the front LED. However,
* don't take this for granted.
*
* Parameters:
* 2: status [0x00, 0x01 or 0x02]
*/
#define SMU_CMD_MISC_df_SET_DISPLAY_LIT 0x02
/*
* Sets mode of power switch.
*
* What this actually does is not yet known. Maybe it enables some interrupt.
*
* Parameters:
* 2: enable power switch? [0x00 or 0x01]
* 3 (optional): enable nmi? [0x00 or 0x01]
*
* Returns:
* If parameter 2 is 0x00 and parameter 3 is not specified, returns whether
* NMI is enabled. Otherwise unknown.
*/
#define SMU_CMD_MISC_df_NMI_OPTION 0x04
/* Sets LED dimm offset.
*
* The front LED dimms itself during sleep. Its brightness (or, well, the PWM
* frequency) depends on current time. Therefore, the SMU needs to know the
* timezone.
*
* Parameters:
* 2-8: unknown (BCD coding)
*/
#define SMU_CMD_MISC_df_DIMM_OFFSET 0x99
/*
* Version info commands
*
* Parameters:
* 1 (optional): Specifies version part to retrieve
*
* Returns:
* Version value
*/
#define SMU_CMD_VERSION_COMMAND 0xea
#define SMU_VERSION_RUNNING 0x00
#define SMU_VERSION_BASE 0x01
#define SMU_VERSION_UPDATE 0x02
/*
* Switches
*
* These are switches whose status seems to be known to the SMU.
*
* Parameters:
* none
*
* Result:
* Switch bits (ORed, see below)
*/
#define SMU_CMD_SWITCHES 0xdc
/* Switches bits */
#define SMU_SWITCH_CASE_CLOSED 0x01
#define SMU_SWITCH_AC_POWER 0x04
#define SMU_SWITCH_POWER_SWITCH 0x08
/*
* Misc commands
*
* This command seem to be a grab bag of various things
*
* SMU_CMD_MISC_ee_GET_DATABLOCK_REC is used, among others, to
* transfer blocks of data from the SMU. So far, I've decrypted it's
* usage to retrieve partition data. In order to do that, you have to
* break your transfer in "chunks" since that command cannot transfer
* more than a chunk at a time. The chunk size used by OF is 0xe bytes,
* but it seems that the darwin driver will let you do 0x1e bytes if
* your "PMU" version is >= 0x30. You can get the "PMU" version apparently
* either in the last 16 bits of property "smu-version-pmu" or as the 16
* bytes at offset 1 of "smu-version-info"
*
* For each chunk, the command takes 7 bytes of arguments:
* byte 0: subcommand code (0x02)
* byte 1: 0x04 (always, I don't know what it means, maybe the address
* space to use or some other nicety. It's hard coded in OF)
* byte 2..5: SMU address of the chunk (big endian 32 bits)
* byte 6: size to transfer (up to max chunk size)
*
* The data is returned directly
*/
#define SMU_CMD_MISC_ee_COMMAND 0xee
#define SMU_CMD_MISC_ee_GET_DATABLOCK_REC 0x02
/* Retrieves currently used watts.
*
* Parameters:
* 1: 0x03 (Meaning unknown)
*/
#define SMU_CMD_MISC_ee_GET_WATTS 0x03
#define SMU_CMD_MISC_ee_LEDS_CTRL 0x04 /* i: 00 (00,01) [00] */
#define SMU_CMD_MISC_ee_GET_DATA 0x05 /* i: 00 , o: ?? */
/*
* Power related commands
*
* Parameters:
* 1: subcommand
*/
#define SMU_CMD_POWER_EVENTS_COMMAND 0x8f
/* SMU_POWER_EVENTS subcommands */
enum {
SMU_PWR_GET_POWERUP_EVENTS = 0x00,
SMU_PWR_SET_POWERUP_EVENTS = 0x01,
SMU_PWR_CLR_POWERUP_EVENTS = 0x02,
SMU_PWR_GET_WAKEUP_EVENTS = 0x03,
SMU_PWR_SET_WAKEUP_EVENTS = 0x04,
SMU_PWR_CLR_WAKEUP_EVENTS = 0x05,
/*
* Get last shutdown cause
*
* Returns:
* 1 byte (signed char): Last shutdown cause. Exact meaning unknown.
*/
SMU_PWR_LAST_SHUTDOWN_CAUSE = 0x07,
/*
* Sets or gets server ID. Meaning or use is unknown.
*
* Parameters:
* 2 (optional): Set server ID (1 byte)
*
* Returns:
* 1 byte (server ID?)
*/
SMU_PWR_SERVER_ID = 0x08,
};
/* Power events wakeup bits */
enum {
SMU_PWR_WAKEUP_KEY = 0x01, /* Wake on key press */
SMU_PWR_WAKEUP_AC_INSERT = 0x02, /* Wake on AC adapter plug */
SMU_PWR_WAKEUP_AC_CHANGE = 0x04,
SMU_PWR_WAKEUP_LID_OPEN = 0x08,
SMU_PWR_WAKEUP_RING = 0x10,
};
/*
* - Kernel side interface -
*/
#ifdef __KERNEL__
/*
* Asynchronous SMU commands
*
* Fill up this structure and submit it via smu_queue_command(),
* and get notified by the optional done() callback, or because
* status becomes != 1
*/
struct smu_cmd;
struct smu_cmd
{
/* public */
u8 cmd; /* command */
int data_len; /* data len */
int reply_len; /* reply len */
void *data_buf; /* data buffer */
void *reply_buf; /* reply buffer */
int status; /* command status */
void (*done)(struct smu_cmd *cmd, void *misc);
void *misc;
/* private */
struct list_head link;
};
/*
* Queues an SMU command, all fields have to be initialized
*/
extern int smu_queue_cmd(struct smu_cmd *cmd);
/*
* Simple command wrapper. This structure embeds a small buffer
* to ease sending simple SMU commands from the stack
*/
struct smu_simple_cmd
{
struct smu_cmd cmd;
u8 buffer[16];
};
/*
* Queues a simple command. All fields will be initialized by that
* function
*/
extern int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
unsigned int data_len,
void (*done)(struct smu_cmd *cmd, void *misc),
void *misc,
...);
/*
* Completion helper. Pass it to smu_queue_simple or as 'done'
* member to smu_queue_cmd, it will call complete() on the struct
* completion passed in the "misc" argument
*/
extern void smu_done_complete(struct smu_cmd *cmd, void *misc);
/*
* Synchronous helpers. Will spin-wait for completion of a command
*/
extern void smu_spinwait_cmd(struct smu_cmd *cmd);
static inline void smu_spinwait_simple(struct smu_simple_cmd *scmd)
{
smu_spinwait_cmd(&scmd->cmd);
}
/*
* Poll routine to call if blocked with irqs off
*/
extern void smu_poll(void);
/*
* Init routine, presence check....
*/
int __init smu_init(void);
extern int smu_present(void);
struct platform_device;
extern struct platform_device *smu_get_ofdev(void);
/*
* Common command wrappers
*/
extern void smu_shutdown(void);
extern void smu_restart(void);
struct rtc_time;
extern int smu_get_rtc_time(struct rtc_time *time, int spinwait);
extern int smu_set_rtc_time(struct rtc_time *time, int spinwait);
/*
* Kernel asynchronous i2c interface
*/
#define SMU_I2C_READ_MAX 0x1d
#define SMU_I2C_WRITE_MAX 0x15
/* SMU i2c header, exactly matches i2c header on wire */
struct smu_i2c_param
{
u8 bus; /* SMU bus ID (from device tree) */
u8 type; /* i2c transfer type */
u8 devaddr; /* device address (includes direction) */
u8 sublen; /* subaddress length */
u8 subaddr[3]; /* subaddress */
u8 caddr; /* combined address, filled by SMU driver */
u8 datalen; /* length of transfer */
u8 data[SMU_I2C_READ_MAX]; /* data */
};
struct smu_i2c_cmd
{
/* public */
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 */