From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by canuck.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1P91Rg-0007ZT-5h for barebox@lists.infradead.org; Thu, 21 Oct 2010 20:09:05 +0000 Date: Thu, 21 Oct 2010 22:09:02 +0200 From: Sascha Hauer Message-ID: <20101021200902.GB22139@pengutronix.de> References: <201010181843.39263.jbe@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <201010181843.39263.jbe@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH] Add GPIO support and GPIO setup features to the S3C processors To: Juergen Beisert Cc: barebox@lists.infradead.org On Mon, Oct 18, 2010 at 06:43:39PM +0200, Juergen Beisert wrote: > From: Juergen Beisert > Subject: Add GPIO support and GPIO setup features to the S3C processors > > This patch adds genetic GPIO support to all S3C2440 processor based systems. > Also it adds definitions to setup the pin multiplexer in a way the other > architectures do. > > Note: Tested on a S3C2440 based system only. But should work on an S3C2410, too. > > Signed-off-by: Juergen Beisert > > --- > arch/arm/Kconfig | 1 > arch/arm/mach-s3c24xx/Makefile | 2 > arch/arm/mach-s3c24xx/gpio-s3c24x0.c | 170 ++++++++ > arch/arm/mach-s3c24xx/include/mach/gpio.h | 31 + > arch/arm/mach-s3c24xx/include/mach/iomux-s3c24x0.h | 426 +++++++++++++++++++++ > 5 files changed, 629 insertions(+), 1 deletion(-) > > Index: barebox-2010.10.0/arch/arm/mach-s3c24xx/gpio-s3c24x0.c > =================================================================== > --- /dev/null > +++ barebox-2010.10.0/arch/arm/mach-s3c24xx/gpio-s3c24x0.c > @@ -0,0 +1,170 @@ > +/* > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation; either version 2 of > + * the License, or (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, > + * MA 02111-1307 USA > + */ > + > +#include > +#include > +#include > +#include > +#include > + > +static const unsigned char group_offset[] = > +{ > + 0x00, /* GPA */ > + 0x10, /* GPB */ > + 0x20, /* GPC */ > + 0x30, /* GPD */ > + 0x40, /* GPE */ > + 0x50, /* GPF */ > + 0x60, /* GPG */ > + 0x70, /* GPH */ > +#ifdef CONFIG_CPU_S3C2440 > + 0xd0, /* GPJ */ > +#endif > +}; > + > +void gpio_set_value(unsigned gpio, int value) > +{ > + unsigned group = gpio >> 5; > + unsigned bit = gpio % 32; > + unsigned offset; > + uint32_t reg; > + > + offset = group_offset[group]; > + > + reg = readl(GPADAT + offset); > + reg &= ~(1 << bit); > + reg |= (!!value) << bit; > + writel(reg, GPADAT + offset); > +} > + > +int gpio_direction_input(unsigned gpio) > +{ > + unsigned group = gpio >> 5; > + unsigned bit = gpio % 32; > + unsigned offset; > + uint32_t reg; > + > + offset = group_offset[group]; > + > + reg = readl(GPACON + offset); > + reg &= ~(0x3 << (bit << 1)); > + writel(reg, GPACON + offset); > + > + return 0; > +} > + > + > +int gpio_direction_output(unsigned gpio, int value) > +{ > + unsigned group = gpio >> 5; > + unsigned bit = gpio % 32; > + unsigned offset; > + uint32_t reg; > + > + offset = group_offset[group]; > + > + /* value */ > + reg = readl(GPADAT + offset); > + reg &= ~(1 << bit); > + reg |= (!!value) << bit; > + writel(reg, GPADAT + offset); You can call gpio_set_value here. > + > + /* direction */ > + if (group == 0) { /* GPA is special */ > + reg = readl(GPACON); > + reg &= ~(1 << bit); > + writel(reg, GPACON); > + } else { gpio_direction_input does not have this special handling. Is this correct? > + reg = readl(GPACON + offset); > + reg &= ~(0x3 << (bit << 1)); > + reg |= 0x1 << (bit << 1); > + writel(reg, GPACON + offset); > + } > + > + return 0; > +} > + -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox