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linux/include/asm-powerpc/smu.h
Benjamin Herrenschmidt ac171c4666 [PATCH] powerpc: Thermal control for dual core G5s 
This patch adds a windfarm module, windfarm_pm112, for the dual core G5s
(both 2 and 4 core models), keeping the machine from getting into
vacuum-cleaner mode ;) For proper credits, the patch was initially
written by Paul Mackerras, and slightly reworked by me to add overtemp
handling among others. The patch also removes the sysfs attributes from
windfarm_pm81 and windfarm_pm91 and instead adds code to the windfarm
core to automagically expose attributes for sensor & controls.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-07 22:05:14 -08:00

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#ifndef _SMU_H
#define _SMU_H
/*
* Definitions for talking to the SMU chip in newer G5 PowerMacs
*/
#ifdef __KERNEL__
#include <linux/config.h>
#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 lenght 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
* 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
* wether 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 differenciate 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 lenght is that of the string.
*
* The VSLEW command can be used to get or set the voltage slewing.
* - lenght 5 (only "VSLEW") : it returns "DONE" and 3 bytes of
* reply at data offset 6, 7 and 8.
* - lenght 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 decyphered 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
*/
#define SMU_CMD_MISC_df_COMMAND 0xdf
#define SMU_CMD_MISC_df_SET_DISPLAY_LIT 0x02 /* i: 1 byte */
#define SMU_CMD_MISC_df_NMI_OPTION 0x04
/*
* Version info commands
*
* I haven't quite tried to figure out how these work
*/
#define SMU_CMD_VERSION_COMMAND 0xea
/*
* 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
#define SMU_CMD_MISC_ee_LEDS_CTRL 0x04 /* i: 00 (00,01) [00] */
#define SMU_CMD_MISC_ee_GET_DATA 0x05 /* i: 00 , o: ?? */
/*
* - 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....
*/
extern int smu_init(void);
extern int smu_present(void);
struct of_device;
extern struct of_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);
/*
* SMU command buffer absolute address, exported by pmac_setup,
* this is allocated very early during boot.
*/
extern unsigned long smu_cmdbuf_abs;
/*
* Kenrel 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 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; /* Lenght of data following */
};
struct smu_user_reply_hdr
{
__u32 status; /* Command status */
__u32 reply_len; /* Lenght of data follwing */
};
#endif /* _SMU_H */
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