From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luka Perkov Date: Sun, 25 Nov 2012 15:52:19 +0100 Subject: [U-Boot] [PATCH 06/22] ARM sunxi: Basic GPIO driver In-Reply-To: <1353843623.17518.17.camel@home.hno.se> References: <1353843623.17518.17.camel@home.hno.se> Message-ID: <20121125145219-9180@mutt-kz> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Henrik, On Sun, Nov 25, 2012 at 12:40:23PM +0100, Henrik Nordstr?m wrote: > GPIO driver for Allwinner sun4i/sun5i family of SoCs > > GPIO Pins are named by their symbolic pin names P<#> > such as PH19 or H19. > > Note: This do not perform any validation if the pin is in use > for some other I/O function. Use with care. > --- > arch/arm/include/asm/arch-sunxi/gpio.h | 2 + > drivers/gpio/Makefile | 1 + > drivers/gpio/sunxi_gpio.c | 116 ++++++++++++++++++++++++++++++++ > include/configs/sunxi-common.h | 4 + > 4 files changed, 123 insertions(+), 0 deletions(-) > create mode 100644 drivers/gpio/sunxi_gpio.c > > diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h > index fceee6b..a3f8a74 100644 > --- a/arch/arm/include/asm/arch-sunxi/gpio.h > +++ b/arch/arm/include/asm/arch-sunxi/gpio.h > @@ -160,5 +160,7 @@ enum sunxi_gpio_number { > > int sunxi_gpio_set_cfgpin(u32 pin, u32 val); > int sunxi_gpio_get_cfgpin(u32 pin); > +int name_to_gpio(const char *name); > +#define name_to_gpio name_to_gpio Are you sure we need this define ? > > #endif /* _SUNXI_GPIO_H */ > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile > index d50ac3b..6d692e6 100644 > --- a/drivers/gpio/Makefile > +++ b/drivers/gpio/Makefile > @@ -45,6 +45,7 @@ COBJS-$(CONFIG_OMAP_GPIO) += omap_gpio.o > COBJS-$(CONFIG_DB8500_GPIO) += db8500_gpio.o > COBJS-$(CONFIG_BCM2835_GPIO) += bcm2835_gpio.o > COBJS-$(CONFIG_S3C2440_GPIO) += s3c2440_gpio.o > +COBJS-$(CONFIG_SUNXI_GPIO) += sunxi_gpio.o > > COBJS := $(COBJS-y) > SRCS := $(COBJS:.o=.c) > diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c > new file mode 100644 > index 0000000..d99071e > --- /dev/null > +++ b/drivers/gpio/sunxi_gpio.c > @@ -0,0 +1,116 @@ > +/* > + * (C) Copyright 2007-2011 > + * Allwinner Technology Co., Ltd. > + * Tom Cubie > + * > + * See file CREDITS for list of people who contributed to this > + * project. > + * > + * 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 > + > +static int sunxi_gpio_output(u32 pin, u32 val) > +{ > + u32 dat; > + u32 bank = GPIO_BANK(pin); > + u32 num = GPIO_NUM(pin); > + struct sunxi_gpio *pio = > + &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; > + > + dat = readl(&pio->dat); > + if (val) > + dat |= 1 << num; > + else > + dat &= ~(1 << num); > + > + writel(dat, &pio->dat); > + > + return 0; > +} > + > +static int sunxi_gpio_input(u32 pin) > +{ > + u32 dat; > + u32 bank = GPIO_BANK(pin); > + u32 num = GPIO_NUM(pin); > + struct sunxi_gpio *pio = > + &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; > + > + dat = readl(&pio->dat); > + dat >>= num; > + > + return dat & 0x1; > +} > + > +int gpio_request(unsigned gpio, const char *label) > +{ > + return 0; > +} > + > +int gpio_free(unsigned gpio) > +{ > + return 0; > +} > + > +int gpio_direction_input(unsigned gpio) > +{ > + sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT); > + > + return sunxi_gpio_input(gpio); > +} > + > +int gpio_direction_output(unsigned gpio, int value) > +{ > + sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT); > + > + return sunxi_gpio_output(gpio, value); > +} > + > +int gpio_get_value(unsigned gpio) > +{ > + return sunxi_gpio_input(gpio); > +} > + > +int gpio_set_value(unsigned gpio, int value) > +{ > + return sunxi_gpio_output(gpio, value); > +} > + > +int name_to_gpio(const char *name) > +{ > + int group = 0; > + int groupsize = 9 * 32; > + long pin; > + const char *eptr; > + if (*name == 'P' || *name == 'p') > + name++; > + if (*name >= 'A') { > + group = *name - (*name > 'a' ? 'a' : 'A'); > + groupsize = 32; > + name++; > + } > + > + pin = simple_strtol(name, &eptr, 10); > + if (!*name || *eptr) > + return -1; > + if (pin < 0 || pin > groupsize || group >= 9) > + return -1; > + return group * 32 + pin; > +} > diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h > index 5bf8eea..bc1f200 100644 > --- a/include/configs/sunxi-common.h > +++ b/include/configs/sunxi-common.h > @@ -206,4 +206,8 @@ > /* #define CONFIG_WATCHDOG */ > /* #define CONFIG_SUNXI_WATCHDOG */ > > +/* GPIO */ > +#define CONFIG_SUNXI_GPIO > +#define CONFIG_CMD_GPIO Why don't you use: #ifdef CONFIG_CMD_GPIO #define CONFIG_SUNXI_GPIO #endif /* CONFIG_CMD_GPIO */ > + > #endif /* __CONFIG_H */ > -- > 1.7.7.6 Luka