From: tony@atomide•com (Tony Lindgren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] serial: DCC(JTAG) serial and console emulation support
Date: Thu, 7 Oct 2010 14:27:07 -0700 [thread overview]
Message-ID: <20101007212707.GI7558@atomide.com> (raw)
In-Reply-To: <1286305668-19987-1-git-send-email-dwalker@codeaurora.org>
Hi,
* Daniel Walker <dwalker@codeaurora•org> [101005 11:59]:
> +#if !defined(CONFIG_CPU_V7)
> +static inline char
> +__dcc_getchar(void)
> +{
> + char __c;
> +
> + asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
> + : "=r" (__c) : : "cc");
> +
> + return __c;
> +}
> +#else
> +static inline char
> +__dcc_getchar(void)
> +{
> + char __c;
> +
> + asm(
> + "get_wait: mrc p14, 0, pc, c0, c1, 0 \n\
> + bne get_wait \n\
> + mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
> + : "=r" (__c) : : "cc");
> +
> + return __c;
> +}
> +#endif
> +
> +#if !defined(CONFIG_CPU_V7)
> +static inline void
> +__dcc_putchar(char c)
> +{
> + asm("mcr p14, 0, %0, c0, c5, 0 @ write a char"
> + : /* no output register */
> + : "r" (c) : "cc");
> +}
> +#else
> +static inline void
> +__dcc_putchar(char c)
> +{
> + asm(
> + "put_wait: mrc p14, 0, pc, c0, c1, 0 \n\
> + bcs put_wait \n\
> + mcr p14, 0, %0, c0, c5, 0 "
> + : : "r" (c) : "cc");
> +}
> +#endif
Can you please pass the read and write functions to the driver
in platform_data? We are already booting kernels with both
ARMv6 and 7 compiled in.
Also, as it's a driver, other architectures may want to use it too.
Regards,
Tony
next prev parent reply other threads:[~2010-10-07 21:27 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-05 19:07 [PATCH] serial: DCC(JTAG) serial and console emulation support Daniel Walker
2010-10-06 2:55 ` Nicolas Pitre
2010-10-06 13:48 ` Daniel Walker
2010-10-06 14:22 ` Nicolas Pitre
2010-10-06 14:49 ` Daniel Walker
2010-10-06 15:21 ` Nicolas Pitre
2010-10-06 15:33 ` Daniel Walker
2010-10-06 15:47 ` Nicolas Pitre
2010-10-06 15:54 ` Daniel Walker
2010-10-06 16:22 ` Nicolas Pitre
2010-10-06 16:40 ` Daniel Walker
2010-10-06 17:02 ` Nicolas Pitre
2010-10-06 17:07 ` Daniel Walker
2010-10-07 21:27 ` Tony Lindgren [this message]
2010-10-07 21:58 ` Daniel Walker
2010-10-08 1:28 ` Nicolas Pitre
2010-10-08 20:35 ` Tony Lindgren
2010-10-08 20:59 ` Tony Lindgren
2010-10-08 21:27 ` Nicolas Pitre
2010-10-08 20:36 ` Tony Lindgren
2010-10-08 1:25 ` Nicolas Pitre
2010-10-08 20:32 ` Tony Lindgren
2010-10-08 20:58 ` Tony Lindgren
2010-10-08 21:28 ` Nicolas Pitre
2010-10-08 21:25 ` Nicolas Pitre
2010-10-08 21:49 ` Tony Lindgren
2010-10-09 0:57 ` Nicolas Pitre
2010-10-13 15:21 ` Arnd Bergmann
2010-10-13 16:17 ` Daniel Walker
2010-10-13 17:44 ` Arnd Bergmann
2010-10-13 18:08 ` Daniel Walker
2010-10-13 19:45 ` Arnd Bergmann
2010-10-13 19:52 ` Daniel Walker
2010-10-13 20:10 ` Arnd Bergmann
2010-10-13 20:24 ` Daniel Walker
2010-10-13 20:44 ` Nicolas Pitre
2010-10-13 20:49 ` Daniel Walker
2010-10-13 22:51 ` Nicolas Pitre
2010-10-13 23:26 ` Russell King - ARM Linux
2010-10-13 23:41 ` Nicolas Pitre
2010-10-13 19:55 ` Nicolas Pitre
2010-10-13 20:00 ` Daniel Walker
2010-10-13 20:27 ` Nicolas Pitre
2010-10-13 20:47 ` Daniel Walker
2010-10-13 22:05 ` Daniel Walker
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