[PATCH v4] mtd: rawnand: cadence: support 64-bit slave dma interface
Miquel Raynal
miquel.raynal at bootlin.com
Tue Oct 18 02:25:07 PDT 2022
Hi Valentin,
vkorenblit at sequans.com wrote on Tue, 18 Oct 2022 11:20:56 +0200:
> Hi Miquel,
>
> On 10/18/22 11:17, Miquel Raynal wrote:
> > Hi Valentin,
> >
> > vkorenblit at sequans.com wrote on Tue, 18 Oct 2022 11:16:31 +0200:
> >
> >> 32-bit accesses on 64-bit sdma trigger sdma_err in intr_status register.
> >>
> >> Check dma capabilities before reading/writing from/to sdma interface.
> >>
> >> Link: https://secure-web.cisco.com/1Zuwps3Jm-Qybygq3UAIg4d4S5heggZX1ow8KENGLYXasfYvc72QPuxCC1kbg9_YPoqVYqfCQVlokpkras6hyjajt6RxKCmlzNhUsTu6vdTgufT8upiLvVnbScXuhDTKV539Fk3pwIluw0CMUbizt16dze_fAdyNKJxwNbEzZIq8DIpD8kK9qUCTdhHSEXza7Ytk_EmwCBawUQFBNNV2CzKBaw-vx5t7gbuvlT1IL9WV4bA3nzUs4NLiN1TV2lBuyA28Duk2i-aouwPb5o3UwDHhHxyCQuGos0F-sSxMREQr2Uj4lgR8lfIpFbk6O8o7J3K2i8rXA4TqUYcRD4BxWWNk3nBHVJxW2oVqX6sjS3Vh32VxOnsoXhttu_3UFm3qziOiukq8jXcvoFPvD6kwJutnujcsJzeGzEBSBfUxSHdgZYFyBbHwqqBC298e3uUV-/https%3A%2F%2Flists.01.org%2Fhyperkitty%2Flist%2Fkbuild-all%40lists.01.org%2Fthread%2F3NMACGIM5NDUBPXRT5RTBZON6LQE5A3B%2F
> > What happened to the link? I guess there is some security software
> > interaction here? Should we take the one from your v3?
>
> I copy/pasted the link that I received in Arnd's email.
Actually Arnd's e-mail contains the right link, but you probably have
some company software poking in your e-mails and translating external
links through your cisco protection.
What Arnd probably meant was to use
Link: xxx
rather than
Link to the discussion: xxx
because the former has been standardized.
> Maybe this is better:
>
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/3NMACGIM5NDUBPXRT5RTBZON6LQE5A3B/
Yes, this is the right link.
>
> Do you want me to do a v5 with it?
I'll take care of it, thanks.
>
> >
> >> Signed-off-by: Valentin Korenblit <vkorenblit at sequans.com>
> >> Reviewed-by: Arnd Bergmann <arnd at arndb.de>
> >>
> >> ---
> >>
> >> Changes v1 -> v2:
> >> - Replaced ioread64_rep by cadence_nand_readsq (suggested by Arnd)
> >> - Replaced iowrite64_rep by cadence_nand_writesq (suggested by Arnd)
> >> - Do not try to access 64-bit sdma if __raw_readq/__raw_writeq are not defined
> >>
> >> Changes v2 -> v3:
> >> - Use readsq/writesq on 64-bit architectures (Arnd)
> >> - Detect issue on init instead of 1st transfer
> >>
> >> Changes v3 -> v4:
> >> - Updated link and reviewed tag (Arnd)
> >> ---
> >> .../mtd/nand/raw/cadence-nand-controller.c | 70 +++++++++++++++----
> >> 1 file changed, 58 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c
> >> index 9dac3ca69d57..7661a5cf1883 100644
> >> --- a/drivers/mtd/nand/raw/cadence-nand-controller.c
> >> +++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
> >> @@ -1184,6 +1184,14 @@ static int cadence_nand_hw_init(struct cdns_nand_ctrl *cdns_ctrl)
> >> if (cadence_nand_read_bch_caps(cdns_ctrl))
> >> return -EIO;
> >> >> +#ifndef CONFIG_64BIT
> >> + if (cdns_ctrl->caps2.data_dma_width == 8) {
> >> + dev_err(cdns_ctrl->dev,
> >> + "cannot access 64-bit dma on !64-bit architectures");
> >> + return -EIO;
> >> + }
> >> +#endif
> >> +
> >> /*
> >> * Set IO width access to 8.
> >> * It is because during SW device discovering width access
> >> @@ -1882,17 +1890,36 @@ static int cadence_nand_read_buf(struct cdns_nand_ctrl *cdns_ctrl,
> >> return status;
> >> >> if (!cdns_ctrl->caps1->has_dma) {
> >> - int len_in_words = len >> 2;
> >> + u8 data_dma_width = cdns_ctrl->caps2.data_dma_width;
> >> +
> >> + int len_in_words = (data_dma_width == 4) ? len >> 2 : len >> 3;
> >> >> /* read alingment data */
> >> - ioread32_rep(cdns_ctrl->io.virt, buf, len_in_words);
> >> + if (data_dma_width == 4)
> >> + ioread32_rep(cdns_ctrl->io.virt, buf, len_in_words);
> >> +#ifdef CONFIG_64BIT
> >> + else
> >> + readsq(cdns_ctrl->io.virt, buf, len_in_words);
> >> +#endif
> >> +
> >> if (sdma_size > len) {
> >> + int read_bytes = (data_dma_width == 4) ?
> >> + len_in_words << 2 : len_in_words << 3;
> >> +
> >> /* read rest data from slave DMA interface if any */
> >> - ioread32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
> >> - sdma_size / 4 - len_in_words);
> >> + if (data_dma_width == 4)
> >> + ioread32_rep(cdns_ctrl->io.virt,
> >> + cdns_ctrl->buf,
> >> + sdma_size / 4 - len_in_words);
> >> +#ifdef CONFIG_64BIT
> >> + else
> >> + readsq(cdns_ctrl->io.virt, cdns_ctrl->buf,
> >> + sdma_size / 8 - len_in_words);
> >> +#endif
> >> +
> >> /* copy rest of data */
> >> - memcpy(buf + (len_in_words << 2), cdns_ctrl->buf,
> >> - len - (len_in_words << 2));
> >> + memcpy(buf + read_bytes, cdns_ctrl->buf,
> >> + len - read_bytes);
> >> }
> >> return 0;
> >> }
> >> @@ -1936,16 +1963,35 @@ static int cadence_nand_write_buf(struct cdns_nand_ctrl *cdns_ctrl,
> >> return status;
> >> >> if (!cdns_ctrl->caps1->has_dma) {
> >> - int len_in_words = len >> 2;
> >> + u8 data_dma_width = cdns_ctrl->caps2.data_dma_width;
> >> +
> >> + int len_in_words = (data_dma_width == 4) ? len >> 2 : len >> 3;
> >> +
> >> + if (data_dma_width == 4)
> >> + iowrite32_rep(cdns_ctrl->io.virt, buf, len_in_words);
> >> +#ifdef CONFIG_64BIT
> >> + else
> >> + writesq(cdns_ctrl->io.virt, buf, len_in_words);
> >> +#endif
> >> >> - iowrite32_rep(cdns_ctrl->io.virt, buf, len_in_words);
> >> if (sdma_size > len) {
> >> + int written_bytes = (data_dma_width == 4) ?
> >> + len_in_words << 2 : len_in_words << 3;
> >> +
> >> /* copy rest of data */
> >> - memcpy(cdns_ctrl->buf, buf + (len_in_words << 2),
> >> - len - (len_in_words << 2));
> >> + memcpy(cdns_ctrl->buf, buf + written_bytes,
> >> + len - written_bytes);
> >> +
> >> /* write all expected by nand controller data */
> >> - iowrite32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
> >> - sdma_size / 4 - len_in_words);
> >> + if (data_dma_width == 4)
> >> + iowrite32_rep(cdns_ctrl->io.virt,
> >> + cdns_ctrl->buf,
> >> + sdma_size / 4 - len_in_words);
> >> +#ifdef CONFIG_64BIT
> >> + else
> >> + writesq(cdns_ctrl->io.virt, cdns_ctrl->buf,
> >> + sdma_size / 8 - len_in_words);
> >> +#endif
> >> }
> >> >> return 0;
> >
> > Thanks,
> > Miquèl
>
> Best regards,
>
> Valentin
>
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> Thank you.
Thanks,
Miquèl
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