Port the linux kernel's omap gpio interface to u-boot. The orignal source is in linux/arch/arm/plat-omap/gpio.c
See doc/README.omap3 for instructions on use.
Signed-off-by: Tom Rix Tom.Rix@windriver.com --- cpu/arm_cortexa8/omap3/Makefile | 2 +- cpu/arm_cortexa8/omap3/gpio.c | 177 +++++++++++++++++++++++++++++++++++++ doc/README.omap3 | 32 +++++++ include/asm-arm/arch-omap3/gpio.h | 93 +++++++++++++++++++ 4 files changed, 303 insertions(+), 1 deletions(-) create mode 100644 cpu/arm_cortexa8/omap3/gpio.c create mode 100644 include/asm-arm/arch-omap3/gpio.h
diff --git a/cpu/arm_cortexa8/omap3/Makefile b/cpu/arm_cortexa8/omap3/Makefile index b96b3dd..4fca556 100644 --- a/cpu/arm_cortexa8/omap3/Makefile +++ b/cpu/arm_cortexa8/omap3/Makefile @@ -26,7 +26,7 @@ include $(TOPDIR)/config.mk LIB = $(obj)lib$(SOC).a
SOBJS := lowlevel_init.o -COBJS := sys_info.o board.o clock.o interrupts.o mem.o syslib.o +COBJS := sys_info.o board.o clock.o gpio.o interrupts.o mem.o syslib.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS)) diff --git a/cpu/arm_cortexa8/omap3/gpio.c b/cpu/arm_cortexa8/omap3/gpio.c new file mode 100644 index 0000000..fefa1d7 --- /dev/null +++ b/cpu/arm_cortexa8/omap3/gpio.c @@ -0,0 +1,177 @@ +/* + * Copyright (c) 2009 Wind River Systems, Inc. + * Tom Rix Tom.Rix@windriver.com + * + * 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 derrived from the linux kernel source + * + * linux/arch/arm/plat-omap/gpio.c + * + * Support functions for OMAP GPIO + * + * Copyright (C) 2003-2005 Nokia Corporation + * Written by Juha Yrjölä juha.yrjola@nokia.com + */ +#include <common.h> +#include <asm/arch/gpio.h> +#include <asm/io.h> +#include <asm/errno.h> + +static struct gpio_bank gpio_bank_34xx[6] = { + { (void *)OMAP34XX_GPIO1_BASE, INT_34XX_GPIO_BANK1, IH_GPIO_BASE, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO2_BASE, INT_34XX_GPIO_BANK2, IH_GPIO_BASE + 32, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO3_BASE, INT_34XX_GPIO_BANK3, IH_GPIO_BASE + 64, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO4_BASE, INT_34XX_GPIO_BANK4, IH_GPIO_BASE + 96, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO5_BASE, INT_34XX_GPIO_BANK5, IH_GPIO_BASE + 128, METHOD_GPIO_24XX }, + { (void *)OMAP34XX_GPIO6_BASE, INT_34XX_GPIO_BANK6, IH_GPIO_BASE + 160, 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; +} + +static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input) +{ + void *reg = bank->base; + u32 l; + + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP24XX_GPIO_OE; + break; + default: + WARNON(1); + return; + } + l = __raw_readl(reg); + if (is_input) + l |= 1 << gpio; + else + l &= ~(1 << gpio); + __raw_writel(l, reg); +} + +void omap_set_gpio_direction(int gpio, int is_input) +{ + struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + _set_gpio_direction(bank, get_gpio_index(gpio), is_input); +} + +static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable) +{ + void *reg = bank->base; + u32 l = 0; + + switch (bank->method) { + case METHOD_GPIO_24XX: + if (enable) + reg += OMAP24XX_GPIO_SETDATAOUT; + else + reg += OMAP24XX_GPIO_CLEARDATAOUT; + l = 1 << gpio; + break; + default: + printf("omap3-gpio unknown bank method %s %d\n", + __FILE__, __LINE__); + return; + } + __raw_writel(l, reg); +} + +void omap_set_gpio_dataout(int gpio, int enable) +{ + struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + _set_gpio_dataout(bank, get_gpio_index(gpio), enable); +} + +int omap_get_gpio_datain(int 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(struct gpio_bank *bank, int gpio) +{ + _set_gpio_direction(bank, get_gpio_index(gpio), 1); +} + +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(bank, gpio); +} diff --git a/doc/README.omap3 b/doc/README.omap3 index 0dbae9b..85afa03 100644 --- a/doc/README.omap3 +++ b/doc/README.omap3 @@ -84,6 +84,38 @@ For all other commands see
help
+Interfaces +========== + +gpio + +To set a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(N, 0); + omap_set_gpio_dataout(N, 1); + } + +To clear a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(N, 0); + omap_set_gpio_dataout(N, 0); + } + +To read a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(NULL, 1); + val = omap_get_gpio_datain(N); + omap_free_gpio(N); + } + if (val) + printf("GPIO N is set\n"); + else + printf("GPIO N is clear\n"); + + Acknowledgements ================
diff --git a/include/asm-arm/arch-omap3/gpio.h b/include/asm-arm/arch-omap3/gpio.h new file mode 100644 index 0000000..08dae7c --- /dev/null +++ b/include/asm-arm/arch-omap3/gpio.h @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2009 Wind River Systems, Inc. + * Tom Rix Tom.Rix@windriver.com + * + * 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 derrived from the linux kernel source + * + * linux/arch/arm/plat-omap/gpio.c + * + * Support functions for OMAP GPIO + * + * Copyright (C) 2003-2005 Nokia Corporation + * Written by Juha Yrjölä juha.yrjola@nokia.com + */ +#ifndef _GPIO_H +#define _GPIO_H + +#define WARNON(c) \ + if (c) \ + printf("WARNING confused at %s %d\n", __func__, __LINE__) + +#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 + +/* From arch/arm/plat-omap/include/mach/irqs.h */ +#define INT_34XX_GPIO_BANK1 29 +#define INT_34XX_GPIO_BANK2 30 +#define INT_34XX_GPIO_BANK3 31 +#define INT_34XX_GPIO_BANK4 32 +#define INT_34XX_GPIO_BANK5 33 +#define INT_34XX_GPIO_BANK6 34 +#define IH2_BASE 32 +#define IH_GPIO_BASE (128 + IH2_BASE) + +struct gpio_bank { + void *base; + u16 irq; /* Unused, kept for compatiblity */ + u16 virtual_irq_start; /* Unused, kept for compatiblity */ + int method; +}; + +#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); +/* Sets the gpio as input or output */ +void omap_set_gpio_direction(int gpio, int is_input); +/* Set or clear a gpio output */ +void omap_set_gpio_dataout(int gpio, int enable); +/* Get the value of a gpio input */ +int omap_get_gpio_datain(int gpio); + +#endif /* _GPIO_H_ */