OMAP3 Port kernel omap gpio interface.

Port version 2.6.27 of 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>

diff --git a/cpu/arm_cortexa8/omap3/Makefile b/cpu/arm_cortexa8/omap3/Makefile
index edf5cb29a7270017c92e1bad8062756433c6ae9d..50176eeb35fc0551807f4ac00f07ecac9de21b33 100644 (file)
--- a/cpu/arm_cortexa8/omap3/Makefile
+++ b/cpu/arm_cortexa8/omap3/Makefile
@@ -29,6 +29,7 @@ SOBJS := lowlevel_init.o
 
 COBJS  += board.o
 COBJS  += clock.o
+COBJS  += gpio.o
 COBJS  += mem.o
 COBJS  += syslib.o
 COBJS  += sys_info.o

diff --git a/cpu/arm_cortexa8/omap3/gpio.c b/cpu/arm_cortexa8/omap3/gpio.c
new file mode 100644 (file)
index 0000000..aeb6066
--- /dev/null
+++ b/cpu/arm_cortexa8/omap3/gpio.c
@@ -0,0 +1,185 @@
+/*
+ * 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 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 Yrjölä <juha.yrjola@nokia.com>
+ *
+ * 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 <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, 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;
+}
+
+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:
+               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 9ab09793ec8026229c43019003ab1b036c924ded..e05e816df4b0a2a495775799f504b7138e26dbbc 100644 (file)
--- 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 (file)
index 0000000..30f633c
--- /dev/null
+++ b/include/asm-arm/arch-omap3/gpio.h
@@ -0,0 +1,86 @@
+/*
+ * 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 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 Yrjölä <juha.yrjola@nokia.com>
+ *
+ * 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;
+};
+
+#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_ */