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[PATCH] ppc64: SMU based macs cpufreq support

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CPU freq support using 970FX powertune facility for iMac G5 and SMU
based single CPU desktop.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2005-11-07 14:27:33 +11:00
committed by Paul Mackerras
parent a82765b6ee
commit 4350147a81
11 changed files with 572 additions and 25 deletions
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60
include/asm-powerpc/smu.h
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@@ -144,7 +144,11 @@
* - 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.
* 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
@@ -333,6 +337,60 @@ 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;
};
/*
* 32 bits integers are usually encoded with 2x16 bits swapped,
* this demangles them
*/
#define SMU_U32_MIX(x) ((((x) << 16) & 0xffff0000u) | (((x) >> 16) & 0xffffu))
/* 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
*/
__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.
*/
};
#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);
#endif /* __KERNEL__ */
/*
* - Userland interface -
*/