[U-Boot] [PATCH 02/10] OMAP3 Port kernel omap gpio interface.
Tom Rix
Tom.Rix at windriver.com
Tue Apr 14 16:40:55 CEST 2009
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 at 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 at 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 at 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 at 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 at 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_ */
--
1.6.0.5
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