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 bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1Ogakx-0000VX-Ab for barebox@lists.infradead.org; Wed, 04 Aug 2010 09:59:31 +0000 From: Michael Grzeschik Date: Wed, 4 Aug 2010 11:59:08 +0200 Message-Id: <1280915957-2910-5-git-send-email-m.grzeschik@pengutronix.de> In-Reply-To: <1280915957-2910-1-git-send-email-m.grzeschik@pengutronix.de> References: <1280915957-2910-1-git-send-email-m.grzeschik@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0943444911==" Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 04/13] arm omap: Add gpio support To: barebox@lists.infradead.org --===============0943444911== Content-Type: text/plain From: Sascha Hauer Signed-off-by: Sascha Hauer --- arch/arm/mach-omap/Kconfig | 15 ++- arch/arm/mach-omap/Makefile | 1 + arch/arm/mach-omap/gpio.c | 206 ++++++++++++++++++++++++++++++++ arch/arm/mach-omap/include/mach/gpio.h | 92 ++++++++++++++ 4 files changed, 311 insertions(+), 3 deletions(-) create mode 100644 arch/arm/mach-omap/gpio.c create mode 100644 arch/arm/mach-omap/include/mach/gpio.h diff --git a/arch/arm/mach-omap/Kconfig b/arch/arm/mach-omap/Kconfig index 158639e..630405b 100644 --- a/arch/arm/mach-omap/Kconfig +++ b/arch/arm/mach-omap/Kconfig @@ -78,9 +78,18 @@ config GPMC depends on (ARCH_OMAP2 || ARCH_OMAP3) default y help - Enable this if you use Texas Instrument's General purpose Memory - Controller(GPMC). GPMC allows you to configure devices such as NOR, - NAND, OneNAND etc. + Enable this if you use Texas Instrument's General purpose Memory + Controller(GPMC). GPMC allows you to configure devices such as NOR, + NAND, OneNAND etc. + +config GPIO + prompt "Support for GPIO configuration" + bool + select GENERIC_GPIO + depends on (ARCH_OMAP2 || ARCH_OMAP3) + default y + help + Enable this if you use Texas Instrument's General Purpose IO # Get the board specific configurations source arch/arm/boards/omap/Kconfig diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile index f672dce..57bab99 100644 --- a/arch/arm/mach-omap/Makefile +++ b/arch/arm/mach-omap/Makefile @@ -24,3 +24,4 @@ obj-$(CONFIG_OMAP_CLOCK_SOURCE_S32K) += s32k_clksource.o obj-$(CONFIG_ARCH_OMAP3) += omap3_core.o omap3_generic.o obj-$(CONFIG_OMAP3_CLOCK_CONFIG) += omap3_clock_core.o omap3_clock.o obj-$(CONFIG_GPMC) += gpmc.o +obj-$(CONFIG_GPIO) += gpio.o diff --git a/arch/arm/mach-omap/gpio.c b/arch/arm/mach-omap/gpio.c new file mode 100644 index 0000000..240ac8e --- /dev/null +++ b/arch/arm/mach-omap/gpio.c @@ -0,0 +1,206 @@ +/* + * Copyright (c) 2009 Wind River Systems, Inc. + * Tom Rix + * + * 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 + * + * This work is derived from the linux 2.6.27 kernel source + * To fetch, use the kernel repository + * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + * Use the v2.6.27 tag. + * + * Below is the original's header including its copyright + * + * linux/arch/arm/plat-omap/gpio.c + * + * Support functions for OMAP GPIO + * + * Copyright (C) 2003-2005 Nokia Corporation + * Written by Juha Yrj��l�� + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include + +static struct gpio_bank gpio_bank_34xx[6] = { + { (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX }, +}; + +static struct gpio_bank *gpio_bank = &gpio_bank_34xx[0]; + +static inline struct gpio_bank *get_gpio_bank(int gpio) +{ + return &gpio_bank[gpio >> 5]; +} + +static inline int get_gpio_index(int gpio) +{ + return gpio & 0x1f; +} + +static inline int gpio_valid(int gpio) +{ + if (gpio < 0) + return -1; + if (gpio < 192) + return 0; + return -1; +} + +static int check_gpio(int gpio) +{ + if (gpio_valid(gpio) < 0) { + printf("ERROR : check_gpio: invalid GPIO %d\n", gpio); + return -1; + } + return 0; +} + +void gpio_set_value(unsigned gpio, int value) +{ + struct gpio_bank *bank; + void *reg; + u32 l = 0; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + reg = bank->base; + + switch (bank->method) { + case METHOD_GPIO_24XX: + if (value) + reg += OMAP24XX_GPIO_SETDATAOUT; + else + reg += OMAP24XX_GPIO_CLEARDATAOUT; + l = 1 << get_gpio_index(gpio); + break; + default: + printf("omap3-gpio unknown bank method %s %d\n", + __FILE__, __LINE__); + return; + } + __raw_writel(l, reg); +} + +int gpio_direction_input(unsigned gpio) +{ + struct gpio_bank *bank; + void *reg; + u32 val; + + if (check_gpio(gpio) < 0) + return -EINVAL; + bank = get_gpio_bank(gpio); + + reg = bank->base; + + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP24XX_GPIO_OE; + break; + default: + return -EINVAL; + } + val = __raw_readl(reg); + val |= 1 << get_gpio_index(gpio); + __raw_writel(val, reg); + + return 0; +} + +int gpio_direction_output(unsigned gpio, int value) +{ + struct gpio_bank *bank; + void *reg; + u32 val; + + if (check_gpio(gpio) < 0) + return -EINVAL; + bank = get_gpio_bank(gpio); + + reg = bank->base; + + gpio_set_value(gpio, value); + + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP24XX_GPIO_OE; + break; + default: + return -EINVAL; + } + + val = __raw_readl(reg); + val &= ~(1 << get_gpio_index(gpio)); + __raw_writel(val, reg); + + return 0; +} + +int gpio_get_value(unsigned gpio) +{ + struct gpio_bank *bank; + void *reg; + + if (check_gpio(gpio) < 0) + return -EINVAL; + bank = get_gpio_bank(gpio); + reg = bank->base; + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP24XX_GPIO_DATAIN; + break; + default: + return -EINVAL; + } + return (__raw_readl(reg) + & (1 << get_gpio_index(gpio))) != 0; +} + +static void _reset_gpio(int gpio) +{ + gpio_direction_input(gpio); +} + +int omap_request_gpio(int gpio) +{ + if (check_gpio(gpio) < 0) + return -EINVAL; + + return 0; +} + +void omap_free_gpio(int gpio) +{ + struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + + _reset_gpio(gpio); +} diff --git a/arch/arm/mach-omap/include/mach/gpio.h b/arch/arm/mach-omap/include/mach/gpio.h new file mode 100644 index 0000000..9840b6e --- /dev/null +++ b/arch/arm/mach-omap/include/mach/gpio.h @@ -0,0 +1,92 @@ +/* + * Copyright (c) 2009 Wind River Systems, Inc. + * Tom Rix + * + * 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 + * + * This work is derived from the linux 2.6.27 kernel source + * To fetch, use the kernel repository + * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + * Use the v2.6.27 tag. + * + * Below is the original's header including its copyright + * + * linux/arch/arm/plat-omap/gpio.c + * + * Support functions for OMAP GPIO + * + * Copyright (C) 2003-2005 Nokia Corporation + * Written by Juha Yrj��l�� + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef _GPIO_H +#define _GPIO_H + +#define OMAP24XX_GPIO_REVISION 0x0000 +#define OMAP24XX_GPIO_SYSCONFIG 0x0010 +#define OMAP24XX_GPIO_SYSSTATUS 0x0014 +#define OMAP24XX_GPIO_IRQSTATUS1 0x0018 +#define OMAP24XX_GPIO_IRQSTATUS2 0x0028 +#define OMAP24XX_GPIO_IRQENABLE2 0x002c +#define OMAP24XX_GPIO_IRQENABLE1 0x001c +#define OMAP24XX_GPIO_WAKE_EN 0x0020 +#define OMAP24XX_GPIO_CTRL 0x0030 +#define OMAP24XX_GPIO_OE 0x0034 +#define OMAP24XX_GPIO_DATAIN 0x0038 +#define OMAP24XX_GPIO_DATAOUT 0x003c +#define OMAP24XX_GPIO_LEVELDETECT0 0x0040 +#define OMAP24XX_GPIO_LEVELDETECT1 0x0044 +#define OMAP24XX_GPIO_RISINGDETECT 0x0048 +#define OMAP24XX_GPIO_FALLINGDETECT 0x004c +#define OMAP24XX_GPIO_DEBOUNCE_EN 0x0050 +#define OMAP24XX_GPIO_DEBOUNCE_VAL 0x0054 +#define OMAP24XX_GPIO_CLEARIRQENABLE1 0x0060 +#define OMAP24XX_GPIO_SETIRQENABLE1 0x0064 +#define OMAP24XX_GPIO_CLEARWKUENA 0x0080 +#define OMAP24XX_GPIO_SETWKUENA 0x0084 +#define OMAP24XX_GPIO_CLEARDATAOUT 0x0090 +#define OMAP24XX_GPIO_SETDATAOUT 0x0094 + +struct gpio_bank { + void *base; + int method; +}; + +/* OMAP3 GPIO registers */ +#define OMAP34XX_GPIO1_BASE 0x48310000 +#define OMAP34XX_GPIO2_BASE 0x49050000 +#define OMAP34XX_GPIO3_BASE 0x49052000 +#define OMAP34XX_GPIO4_BASE 0x49054000 +#define OMAP34XX_GPIO5_BASE 0x49056000 +#define OMAP34XX_GPIO6_BASE 0x49058000 + +#define METHOD_GPIO_24XX 4 + +/* This is the interface */ + +/* Request a gpio before using it */ +int omap_request_gpio(int gpio); +/* Reset and free a gpio after using it */ +void omap_free_gpio(int gpio); +void gpio_set_value(unsigned gpio, int value); +int gpio_get_value(unsigned gpio); +int gpio_direction_output(unsigned gpio, int value); +int gpio_direction_input(unsigned gpio); + +#endif /* _GPIO_H_ */ -- 1.7.1 --===============0943444911== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox --===============0943444911==--