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-This document describes the cx2341x memory map and documents some of the register
-space.
-
-Note: the memory long words are little-endian ('intel format').
-
-Warning! This information was figured out from searching through the memory and
-registers, this information may not be correct and is certainly not complete, and
-was not derived from anything more than searching through the memory space with
-commands like:
-
- ivtvctl -O min=0x02000000,max=0x020000ff
-
-So take this as is, I'm always searching for more stuff, it's a large
-register space :-).
-
-Memory Map
-==========
-
-The cx2341x exposes its entire 64M memory space to the PCI host via the PCI BAR0
-(Base Address Register 0). The addresses here are offsets relative to the
-address held in BAR0.
-
-0x00000000-0x00ffffff Encoder memory space
-0x00000000-0x0003ffff Encode.rom
- ???-??? MPEG buffer(s)
- ???-??? Raw video capture buffer(s)
- ???-??? Raw audio capture buffer(s)
- ???-??? Display buffers (6 or 9)
-
-0x01000000-0x01ffffff Decoder memory space
-0x01000000-0x0103ffff Decode.rom
- ???-??? MPEG buffers(s)
-0x0114b000-0x0115afff Audio.rom (deprecated?)
-
-0x02000000-0x0200ffff Register Space
-
-Registers
-=========
-
-The registers occupy the 64k space starting at the 0x02000000 offset from BAR0.
-All of these registers are 32 bits wide.
-
-DMA Registers 0x000-0xff:
-
- 0x00 - Control:
- 0=reset/cancel, 1=read, 2=write, 4=stop
- 0x04 - DMA status:
- 1=read busy, 2=write busy, 4=read error, 8=write error, 16=link list error
- 0x08 - pci DMA pointer for read link list
- 0x0c - pci DMA pointer for write link list
- 0x10 - read/write DMA enable:
- 1=read enable, 2=write enable
- 0x14 - always 0xffffffff, if set any lower instability occurs, 0x00 crashes
- 0x18 - ??
- 0x1c - always 0x20 or 32, smaller values slow down DMA transactions
- 0x20 - always value of 0x780a010a
- 0x24-0x3c - usually just random values???
- 0x40 - Interrupt status
- 0x44 - Write a bit here and shows up in Interrupt status 0x40
- 0x48 - Interrupt Mask
- 0x4C - always value of 0xfffdffff,
- if changed to 0xffffffff DMA write interrupts break.
- 0x50 - always 0xffffffff
- 0x54 - always 0xffffffff (0x4c, 0x50, 0x54 seem like interrupt masks, are
- 3 processors on chip, Java ones, VPU, SPU, APU, maybe these are the
- interrupt masks???).
- 0x60-0x7C - random values
- 0x80 - first write linked list reg, for Encoder Memory addr
- 0x84 - first write linked list reg, for pci memory addr
- 0x88 - first write linked list reg, for length of buffer in memory addr
- (|0x80000000 or this for last link)
- 0x8c-0xdc - rest of write linked list reg, 8 sets of 3 total, DMA goes here
- from linked list addr in reg 0x0c, firmware must push through or
- something.
- 0xe0 - first (and only) read linked list reg, for pci memory addr
- 0xe4 - first (and only) read linked list reg, for Decoder memory addr
- 0xe8 - first (and only) read linked list reg, for length of buffer
- 0xec-0xff - Nothing seems to be in these registers, 0xec-f4 are 0x00000000.
-
-Memory locations for Encoder Buffers 0x700-0x7ff:
-
-These registers show offsets of memory locations pertaining to each
-buffer area used for encoding, have to shift them by <<1 first.
-
-0x07F8: Encoder SDRAM refresh
-0x07FC: Encoder SDRAM pre-charge
-
-Memory locations for Decoder Buffers 0x800-0x8ff:
-
-These registers show offsets of memory locations pertaining to each
-buffer area used for decoding, have to shift them by <<1 first.
-
-0x08F8: Decoder SDRAM refresh
-0x08FC: Decoder SDRAM pre-charge
-
-Other memory locations:
-
-0x2800: Video Display Module control
-0x2D00: AO (audio output?) control
-0x2D24: Bytes Flushed
-0x7000: LSB I2C write clock bit (inverted)
-0x7004: LSB I2C write data bit (inverted)
-0x7008: LSB I2C read clock bit
-0x700c: LSB I2C read data bit
-0x9008: GPIO get input state
-0x900c: GPIO set output state
-0x9020: GPIO direction (Bit7 (GPIO 0..7) - 0:input, 1:output)
-0x9050: SPU control
-0x9054: Reset HW blocks
-0x9058: VPU control
-0xA018: Bit6: interrupt pending?
-0xA064: APU command
-
-
-Interrupt Status Register
-=========================
-
-The definition of the bits in the interrupt status register 0x0040, and the
-interrupt mask 0x0048. If a bit is cleared in the mask, then we want our ISR to
-execute.
-
-Bit
-31 Encoder Start Capture
-30 Encoder EOS
-29 Encoder VBI capture
-28 Encoder Video Input Module reset event
-27 Encoder DMA complete
-24 Decoder audio mode change detection event (through event notification)
-22 Decoder data request
-20 Decoder DMA complete
-19 Decoder VBI re-insertion
-18 Decoder DMA err (linked-list bad)
-
-Missing
-Encoder API call completed
-Decoder API call completed
-Encoder API post(?)
-Decoder API post(?)
-Decoder VTRACE event