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Diffstat (limited to 'Documentation/video4linux/cx2341x/fw-memory.txt')
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diff --git a/Documentation/video4linux/cx2341x/fw-memory.txt b/Documentation/video4linux/cx2341x/fw-memory.txt deleted file mode 100644 index 9d736fe8d..000000000 --- a/Documentation/video4linux/cx2341x/fw-memory.txt +++ /dev/null @@ -1,139 +0,0 @@ -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 |