[U-Boot] [PATCHv4 0/3] drivers/ddr/altera: Add the DDR controller driver for SoCFPGA

[Marek Vasut]

On Wednesday, July 22, 2015 at 10:27:10 AM, Dinh Nguyen wrote:
> On 7/20/15 2:40 PM, Marek Vasut wrote:
> > On Monday, July 20, 2015 at 09:31:39 PM, Dinh Nguyen wrote:
> > [...]
> > 
> >>>>> Hi,
> >>>>> 
> >>>>> yeah, I have some insane amount of cleanup patches and fixes already.
> >>>>> I will post them once I'm done. What I am sorely missing is the
> >>>>> UniPHY register interface documentation, it looks like that is not
> >>>>> public, so I don't exactly know if what sequencer.c does is really
> >>>>> correct. Sometimes I have serious doubts about that too . Can you
> >>>>> give me the documentation please ?
> >>>> 
> >>>> Have you seen this link[1]?
> >>> 
> >>> Yes, but that is by far not all of the registers used in the
> >>> sequencer.c, is it ?
> >> 
> >> Looks like it's in the entire emi.pdf file[1]. Please look at volume 3,
> >> or page 531 of 895. The section for the UniPHY.
> > 
> > I extracted all the possible addresses used in the sequencer while
> > cleaning it up, they're below. I cannot find these in any documentation.
> > I checked the EMI RM, sure, but there seems to be many more registers
> > all around the place than what are described in the EMI RM. Any ideas
> > please ? Maybe this is not even the UniPHY anymore ?
> 
> What I've been told was that the UniPHY was not really properly
> documented, and that when anyone needed to modify the registers, they
> would have to go back to the RTL to figure out exactly what's going on.

I guess you cannot provide me with the RTL, right ?

> So I've only been able to get the following information on the registers
> below:
> 
> [Read/Write manager - this is a small accelerator that can be programmed
> with custom microcode to "play" sequences of commands to the memory
> interface at memory speeds]

This makes sense from what I saw in the code, yeah. Is there any documentation?

Thanks!

> [This register will execute a specific RW MGR command for a single DQS
> group]
> 9 #define RW_MGR_RUN_SINGLE_GROUP_OFFSET          0x0
> [This register will execute a specific RW MGR command for all DQS groups
> in the memory in parallel]
>  20 #define RW_MGR_RUN_ALL_GROUPS_OFFSET            0x0400
> [Resets the read datapath to clear out any corrupted data]
>  21 #define RW_MGR_RESET_READ_DATAPATH_OFFSET       0x1000
> [Configurable mask to specify which chip select should be asserted and
> what the value of ODT should be when CS is asserted]
>  22 #define RW_MGR_SET_CS_AND_ODT_MASK_OFFSET       0x1400
> [Write pointer into the instruction microcode rom]
>  23 #define RW_MGR_INST_ROM_WRITE_OFFSET            0x1800
> [Write pointer into the address ROM that is indexed via instruction
> microcode]
>  24 #define RW_MGR_AC_ROM_WRITE_OFFSET              0x1C00
> 
> [The Scan-Chain Control manager is a piece of hardware that interfaces
> to the serial scan chain configuration bus of the PHY.  It is used to
> program and modify delay values during calibration and sometimes during
> operation for things like DQS tracking]
> [which DQS group the SCC_MGR is talking to]
>  80 #define SCC_MGR_GROUP_COUNTER_OFFSET            0x0000
> [Offset for DQS input delay]
>  81 #define SCC_MGR_DQS_IN_DELAY_OFFSET             0x0100
> [Offset for DQS Enable Coarse input Phase register]
>  82 #define SCC_MGR_DQS_EN_PHASE_OFFSET             0x0200
> [Offset for DQS Enable Phase fine-grained delay]
>  83 #define SCC_MGR_DQS_EN_DELAY_OFFSET             0x0300
> [Offset for DQ/DQS coarse output phase register]
>  84 #define SCC_MGR_DQDQS_OUT_PHASE_OFFSET          0x0400
> [Offset for termination control delay setting register]
>  85 #define SCC_MGR_OCT_OUT1_DELAY_OFFSET           0x0500
> [Don't know]
>  86 #define SCC_MGR_IO_OUT1_DELAY_OFFSET            0x0700
> [Input delay register]
>  87 #define SCC_MGR_IO_IN_DELAY_OFFSET              0x0900
> 
> [It seems these are added specifically for 28nm handshaking with HPS
> only.  I'm strictly guessing here]
> [DQS enable gating delay register]
>  90 #define SCC_MGR_DQS_EN_DELAY_GATE_OFFSET        0x0600
> [Output enable timing register]
>  91 #define SCC_MGR_IO_OE_DELAY_OFFSET              0x0800
> [Not sure]
>  92 #define SCC_MGR_HHP_GLOBALS_OFFSET              0x0A00
> [Not sure]
>  93 #define SCC_MGR_HHP_RFILE_OFFSET                0x0B00
> [Probably a register to query whether or not the AFI bus is still in
> calibration mode or if the HPS has control]
>  94 #define SCC_MGR_AFI_CAL_INIT_OFFSET             0x0D00
>  95
> 
> 
> Dinh

Best regards,
Marek Vasut