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Groups > linux.kernel > #1642993
| From | Dong Aisheng <dongas86@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support |
| Date | 2017-05-17 07:50 +0200 |
| Message-ID | <tI00p-7v7-23@gated-at.bofh.it> (permalink) |
| References | <tHoo9-lZ-13@gated-at.bofh.it> <tHIGf-4Ub-17@gated-at.bofh.it> <tHXYC-6cB-5@gated-at.bofh.it> <tHZQJ-7s4-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, May 17, 2017 at 08:37:41AM +0300, Nikita Yushchenko wrote:
>
>
> 17.05.2017 06:39, Dong Aisheng wrote:
> > On Tue, May 16, 2017 at 02:15:08PM +0300, Nikita Yushchenko wrote:
> >>> static u32 lpuart32_read(void __iomem *addr)
> >>> {
> >>> - return ioread32be(addr);
> >>> + return lpuart_is_be ? ioread32be(addr) : readl(addr);
> >>> }
> >>>
> >>> static void lpuart32_write(u32 val, void __iomem *addr)
> >>> {
> >>> - iowrite32be(val, addr);
> >>> + if (lpuart_is_be)
> >>> + iowrite32be(val, addr);
> >>> + else
> >>> + writel(val, addr);
> >>> }
> >>
> >> What if this is ever executed on big endian system?
> >>
> >
> > Sorry, not catching the point...
> >
> > What issues will meet?
>
> Isn't writel() in host endian?
On big endian systems, it is supposed to run iowrite32be.
Regards
Dong Aisheng
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Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Nikita Yushchenko <nikita.yoush@cogentembedded.com> - 2017-05-16 13:20 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Dong Aisheng <dongas86@gmail.com> - 2017-05-17 05:40 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Nikita Yushchenko <nikita.yoush@cogentembedded.com> - 2017-05-17 07:40 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Dong Aisheng <dongas86@gmail.com> - 2017-05-17 07:50 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Nikita Yushchenko <nikita.yoush@cogentembedded.com> - 2017-05-17 08:00 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Dong Aisheng <dongas86@gmail.com> - 2017-05-17 08:20 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-05-17 12:00 +0200
Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-05-17 12:00 +0200
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