SceClockgen

Module

Version	World	Privilege
0.940-3.65	Non-secure	Kernel

Hardware

Clockgen is a derivative of the P1P40167 1.8V 4-PLL Low Power Clock Generator by ON Semiconductor (onsemi). The reference frequency of 27 MHz is generated thank to an on-board oscillator (from Analog Devices).

According to the P1P40167 datasheet, 5 clock signals are generated by Clockgen:

Clock	Usage	Notes
22.5792 MHz	CameraClk?
27 MHz	WlanBtClk?	Buffered oscillator clock
37 MHz	?	Configurable spread-spectrum. Always on?
48 MHz	UCLK?	"Main" Kermit clock? Always on.
Audio Clock	AudioClk?	Configurable (22.5792 or 24.576 MHz)

However, MotionClk is missing from this list (maybe it's the 37 MHz clock?).

Communication between Kermit and Clockgen is performed over I²C (bus 0, address 0xD2).

Libraries

Known NIDs

Version	Name	World	Visibility	NID
0.940-3.60	SceClockgenForDriver	Non-secure	Kernel	0xFF160234

SceClockgenForDriver

sceClockgenInitForDriver

Version	NID
3.60	0x0BA41732

This is a guessed name.

int sceClockgenInitForDriver(void);

sceClockgenSetProtocolForDriver

Version	NID
3.60	0xEFE8A68C

This is a guessed name.

Only affects how sceClockgenInit reads the Clockgen registers:

• If single_byte_mode is false, all registers are read using a single 0x10-byte read burst
• Otherwise, the registers are read one by one using single-byte reads (in this case, only registers 0~2 are read)

By default, SceClockgen uses the single byte mode.

int sceClockgenSetProtocolForDriver(SceBool single_byte_mode);

sceClockgenGetRegValueForDriver

Version	NID
3.60	0x09072366

This is a guessed name. Returns the cached value of Clockgen register reg.

// reg: between 0 and 2
int sceClockgenGetRegValueForDriver(SceUInt32 reg);

sceClockgenSetSpectrumSpreadingForDriver

Version	NID
3.60	0xA2CA8B65

Configures the spread spectrum output (37 MHz).

Only supported if the vendor ID is 0x3, 0x4, 0x7, 0x8, 0x9, 0xC or 0xF. If vendor ID is 0x4, the revision code must not be 0.

If vendor ID is 0xF and revision code is 0x4, additional configuration is performed.

/* If `ss` is negative, restores the configuration read during sceClockgenInit.
 * Otherwise, if vendor ID is NOT 0x4, regular P1P40167 behavior:
 *  - 0~1  : no spread      (reg = 0)
 *  - 2~6  : -0.5% spread   (reg = 1)
 *  - 7~14 : -1% spread     (reg = 2)
 *  - 15~24: -2% spread     (reg = 4)
 *  - >= 25: -3% spread     (reg = 6)
 *
 * Otherwise - if vendor ID is 0x4 - alternative behavior:
 *  - 0~1  : no spread      (reg = 0)
 *  - 2~6  : ?              (reg = 1)
 *  - 7~11 : ?              (reg = 2)
 *  - 12~16: ?              (reg = 3)
 *  - 17~21: ?              (reg = 4)
 *  - 22~26: ?              (reg = 5)
 *  - >= 27: ?              (reg = 6)
 */
int sceClockgenSetSpectrumSpreadingForDriver(SceInt32 ss);

sceClockgenGetRevisionForDriver

Version	NID
3.60	0xCF63B11D

This is a guessed name. Returns the contents of Clockgen register 0 (Vendor ID & Revision Code).

/* Bit <7:4>: revision code
 * Bit <3:0>: vendor ID
 */
int sceClockgenGetRevisionForDriver(void);

sceClockgenWlanBtClkEnableForDriver

Version	NID
0.990-3.60	0x7B28A724

int sceClockgenWlanBtClkEnableForDriver(void);

sceClockgenWlanBtClkDisableForDriver

Version	NID
0.990-3.60	0xB6F0A532

int sceClockgenWlanBtClkDisableForDriver(void);

sceClockgenCameraClkEnableForDriver

Version	NID
0.940-3.60	0x06663ECA

int sceClockgenCameraClkEnableForDriver(void);

sceClockgenCameraClkDisableForDriver

Version	NID
0.940-3.60	0x82F39378

int sceClockgenCameraClkDisableForDriver(void);

sceClockgenAudioClkEnableForDriver

Version	NID
3.60	0x5130682D

This is a guessed name.

int sceClockgenAudioClkEnableForDriver(void);

sceClockgenAudioClkDisableForDriver

Version	NID
3.60	0xF0A0242D

This is a guessed name.

int sceClockgenAudioClkDisableForDriver(void);

sceClockgenAudioClkSetSamplingFreqForDriver

Version	NID
3.60	0x820D3516

This is a guessed name.

// Frequency must be 44100 or 48000 (default configuration is 48000)
int sceClockgenAudioClkSetSamplingFreqForDriver(SceUInt32 frequency);

sceClockgenMotionClkEnableForDriver

Version	NID
3.60	0x62478916

This is a guessed name.

If Clockgen revision is at least 2, sets bit 2 of Clockgen register 1 (Reserved in P1P40167 datasheet).

int sceClockgenMotionClkEnableForDriver(void);

sceClockgenMotionClkDisableForDriver

Version	NID
3.60	0x66AC5580

This is a guessed name.

If Clockgen revision is at least 2, clears bit 2 of Clockgen register 1 (Reserved in P1P40167 datasheet).

int sceClockgenMotionClkDisableForDriver(void);