From: sshtylyov@ru•mvista.com (Sergei Shtylyov)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] arm/tegra: Support Tegra30 in decompressor UART setup
Date: Mon, 26 Dec 2011 14:51:27 +0400 [thread overview]
Message-ID: <4EF851AF.60203@ru.mvista.com> (raw)
In-Reply-To: <1324587719-32731-1-git-send-email-swarren@nvidia.com>
Hello.
On 23-12-2011 1:01, Stephen Warren wrote:
> On Tegra20, the UART clock runs at 216MHz, whereas on Tegra30 it runs at
> 408MHz. Modify arch_decomp_setup() to detect Tegra20-vs-Tegra30 at run-
> time, and program the correct divisor.
> This makes uncompressor messages work correctly on Tegra30. This also
> fixes early printk, assuming zImage is used and this setup code runs.
> Signed-off-by: Stephen Warren<swarren@nvidia•com>
> ---
> arch/arm/mach-tegra/include/mach/uncompress.h | 20 ++++++++++++++++++--
> 1 files changed, 18 insertions(+), 2 deletions(-)
> diff --git a/arch/arm/mach-tegra/include/mach/uncompress.h b/arch/arm/mach-tegra/include/mach/uncompress.h
> index 4e83237..61d6e08 100644
> --- a/arch/arm/mach-tegra/include/mach/uncompress.h
> +++ b/arch/arm/mach-tegra/include/mach/uncompress.h
[...]
> @@ -45,15 +47,29 @@ static inline void flush(void)
>
> static inline void arch_decomp_setup(void)
> {
> + u8 *distctr = (u8 *)(TEGRA_ARM_INT_DIST_BASE +
> + GIC_DIST_CTR);
> + u32 ctlrs, div;
> volatile u8 *uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
> int shift = 2;
>
> if (uart == NULL)
> return;
>
> + /*
> + * Tegra20 has 4 interrupt controllers
> + * Tegra30 has 5 interrupt controllers
> + * Future SoCs may need additional means of identification
> + */
> + ctlrs = (*distctr) & 0x1f;
() not necessary.
WBR, Sergei
next prev parent reply other threads:[~2011-12-26 10:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 21:01 [PATCH] arm/tegra: Support Tegra30 in decompressor UART setup Stephen Warren
2011-12-26 10:51 ` Sergei Shtylyov [this message]
2012-01-03 18:03 ` Stephen Warren
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4EF851AF.60203@ru.mvista.com \
--to=sshtylyov@ru$(echo .)mvista.com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox