Hardware/Hollywood GPIOs

< Hardware

The Hollywood chipset includes 24 general purpose I/O lines with interrupt capability. Two full sets of registers are provided, and the Broadway only has access to one half. Each pin can be assigned to one of the two sets of registers, which lets the Starlet control which pins only it can control, and which pins the Broadway can use too.

Hollywood GPIOs
Hollywood Registers
Access size32 bits
Byte orderBig Endian
This box: view  talk  edit

Pin connections

Bit Direction Connection Description
0 IN POWER Power button input (pulse width limited; will not detect a held-down state)
1 OUT SHUTDOWN Output high to turn system off (Power LED = red)
2 OUT FAN Fan power, active high
3 OUT DC_DC DC/DC converter power, active high (powers the Broadway?[check]). When off, also triggers the Yellow power LED
4 OUT DI_SPIN DI Spinup enable? Not sure[check]
5 OUT SLOT_LED Blue disc slot LED, active high
6 IN EJECT_BTN Eject button (pulse width limited). Button press will also trigger the drive directly.
7 IN SLOT_IN Disc slot optical detector. High if disc in drive, disc being inserted, or disc still in slot after eject.
8 OUT SENSOR_BAR Sensor bar, active high
9 OUT DO_EJECT Pulse high to trigger a DI eject from software
14 OUT AVE_SCL A/V Encoder I²C Clock
15 I/O AVE_SDA A/V Encoder I²C Data (has an external pull-up, so you should only drive it low)
16 OUT DEBUG0 Debug Testpoint TP221
17 OUT DEBUG0 Debug Testpoint TP222
18 OUT DEBUG0 Debug Testpoint TP223
19 OUT DEBUG0 Debug Testpoint TP224
20 OUT DEBUG0 Debug Testpoint TP225
21 OUT DEBUG0 Debug Testpoint TP226
22 OUT DEBUG0 Debug Testpoint TP219
23 OUT DEBUG0 Debug Testpoint TP220

insertion. | 0 || OUT || SENSOR_BAR || Sensor bar power, active high Pin Dir Owner Description

 0  IN    ARM     Power Button (pulse on press)
 1  OUT   ARM     Shutdown (write 1 for poweroff to red mode)
 2  OUT   ARM     Fan
 3  OUT   ARM     DC-DC converter (write 0 to turn LED yellow and presumably shut down PPC)
 4  OUT   ARM     DI Spinup Enable (maybe; unsure)
 5  OUT   varies  Slot LED
 6  IN    ARM     Eject button (pulse on press) - also triggers DI eject in hardware
 7  IN    PPC     Disc slot front insertion detector - also triggers DI insert in hardware
 8  OUT   PPC     Sensor Bar
 9  OUT   PPC     DI Eject (write 1 to trigger)
14  OUT   PPC     Video Encoder SCL
15  I/O   PPC     Video Encoder SDA
16  OUT   ARM     Debug port bit 0 / TP221
17  OUT   ARM     Debug port bit 1 / TP222
18  OUT   ARM     Debug port bit 2 / TP223
19  OUT   ARM     Debug port bit 3 / TP224
20  OUT   ARM     Debug port bit 4 / TP225
21  OUT   ARM     Debug port bit 5 / TP226
22  OUT   ARM     Debug port bit 6 / TP219
23  OUT   ARM     Debug port bit 7 / TP220


Register list

Hollywood GPIOs
Address Bits Name Description
0x0d8000c0 32 HW_GPIOB_OUT GPIO Outputs (Broadway access)
0x0d8000c4 32 HW_GPIOB_DIR GPIO Direction (Broadway access)
0x0d8000c8 32 HW_GPIOB_IN GPIO Inputs (Broadway access)
0x0d8000cc 32 HW_GPIOB_INTLVL GPIO Interrupt Levels (Broadway access)
0x0d8000d0 32 HW_GPIOB_INTFLAG GPIO Interrupt Flags (Broadway access)
0x0d8000d4 32 HW_GPIOB_INTMASK GPIO Interrupt Masks (Broadway access)
0x0d8000d8 32 HW_GPIOB_INMIR GPIO Input Mirror (Broadway access)
0x0d8000dc 32 HW_GPIO_ENABLE GPIO Enable
0x0d8000e0 32 HW_GPIO_OUT GPIO Outputs (Starlet only)
0x0d8000e4 32 HW_GPIO_DIR GPIO Direction (Starlet only)
0x0d8000e8 32 HW_GPIO_IN GPIO Inputs (Starlet only)
0x0d8000ec 32 HW_GPIO_INTLVL GPIO Interrupt Levels (Starlet only)
0x0d8000f0 32 HW_GPIO_INTFLAG GPIO Interrupt Flags (Starlet only)
0x0d8000f4 32 HW_GPIO_INTMASK GPIO Interrupt Masks (Starlet only)
0x0d8000f8 32 HW_GPIO_INMIR GPIO Input Mirror (Starlet only)
0x0d8000fc 32 HW_GPIO_OWNER GPIO Owner Select

Register descriptions

HW_GPIO_ENABLE (0x0d8000dc)
  3124 230
Access U R/W

The bits of this register indicate whether specific GPIO pins are enabled. The typical value is 0xFFFFFF, to enable all pins.

HW_GPIO_OUT (0x0d8000e0)
  3124 230
Access U R/W

This register contains the output value for all pins. These only take effect if the pin is configured as an output.

HW_GPIO_DIR (0x0d8000e0)
  3124 230
Access U R/W

A '1' bit for a pin indicates that it will behave as an output (drive), while a '0' bit tristates the pin and it becomes a high-impedance input.

HW_GPIO_IN (0x0d8000e0)
  3124 230
Access U R

This register can be read to obtain the current input value of the GPIO pins.

HW_GPIO_INTLVL (0x0d8000e0)
  3124 230
Access U R/W

Configures the pin state that causes an interrupt. If a bit is set in this register, the pin causes an interrupt when high (or on the rising edge?[check]). A zero causes the opposite behavior.

HW_GPIO_INTFLAG (0x0d8000f0)
  3124 230
Access U R/Z

Bits in this register indicate which pins have triggered their interrupt flags. Write one to clear a bit back to zero.

HW_GPIO_INTMASK (0x0d8000f4)
  3124 230
Access U R/W

Only the bits set in this register propagate their interrupts to the master Starlet GPIO interrupt (#11). All other pin interrupts are ignored, although the interrupt state can still be queried and cleared in HW_GPIO_INTFLAG.

HW_GPIO_INMIR (0x0d8000f8)
  3124 230
Access U R/W

This register appears to contain the input state at some point in time, possibly power-on or interrupt or something like that. [check]

HW_GPIO_OWNER (0x0d8000fc)
  3124 230
Access U R/W

This register configures which pins are controlled with HW_GPIO registers vs HW_GPIOB registers. A one bit configures the pin for control via the HW_GPIOB registers, and enables access by the Broadway. A zero bit restricts access to the HW_GPIO registers, which are Starlet-only.

HW_GPIOB_OUT (0x0d8000c0)
  3124 230
Access U R/W

HW_GPIOB_DIR (0x0d8000c4)
  3124 230
Access U R/W

HW_GPIOB_IN (0x0d8000c8)
  3124 230
Access U R

HW_GPIOB_INTLVL (0x0d8000cc)
  3124 230
Access U R/W

HW_GPIOB_INTFLAG (0x0d8000d0)
  3124 230
Access U R/Z

HW_GPIOB_INTMASK (0x0d8000d4)
  3124 230
Access U R/W

HW_GPIOB_INMIR (0x0d8000d8)
  3124 230
Access U R/W

These registers operate identically to their HW_GPIO counterparts above, but they control the pins which have their respective HW_GPIO_OWNER bits set to 1. They can be accessed by the Broadway, although their interrupt (HW_GPIOB_INTFLAG & HW_GPIOB_INTMASK) is mapped to Starlet IRQ #10.