Messages in this thread | | | Date | Thu, 28 Jan 2021 23:11:10 +0100 | From | Miquel Raynal <> | Subject | Re: [PATCH V3] mtd: rawnand: qcom: update last code word register |
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Hello,
mdalam@codeaurora.org wrote on Fri, 29 Jan 2021 03:18:46 +0530:
> On 2021-01-14 21:23, Miquel Raynal wrote: > > Hello, > > > > Md Sadre Alam <mdalam@codeaurora.org> wrote on Sun, 10 Jan 2021 > > 09:31:45 +0530: > > > >> From QPIC version 2.0 onwards new register got added to > > > > a > > > >> read last codeword. This change will update the same. > > > > the? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Please reword this sentence. > > Fixed this in V4 patch. > > > >> For first three code word READ_LOCATION_n register will be > >> use.For last code word READ_LOCATION_LAST_CW_n register will be > >> use. > > > > "For the first three codewords, READ_LOCATION_n registers will be used. > > The last codeword register will be accessed through > > READ_LOCATION_LAST_CW_n." > > > > Also, please specify what these registers store. > > The location register is mainly use for reading controller > buffer via BAM mode. The bits of the register "NAND_READ_LOCATION_LAST_CW_n, n=0..4" > as follow:
Perhaps what I do not understand is: when is this "last_cw" register more useful than the previous set?
> [9:0]-bits : (OFFSET) This bit defines the offset from the buffer base address to be picked up for DMA. > [25:16]-bits: (SIZE) This bit of every register will define the size of the chunk for DMA. > 31-bit : (LAST) If this bit is set, the controller takes the particular register to specify the last chunk > of data made available for DMA. This chunk is part of the internal buffer of the controller. > > >
Thanks, Miquèl
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