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authorMarek Vasut <marex@denx.de>2012-07-21 05:02:23 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-09-01 14:58:13 +0200
commit308252adaf090335fcc0c8bc8b49668f9d98022f (patch)
treeebda220ff958963d4df1cbf998c889b2ef6540ac /drivers/gpio/omap_gpio.c
parent16e41c857ceb4534e8105f5f13d5803584e69590 (diff)
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dm: Move OMAP GPIO driver to drivers/gpio/
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Wolfgang Denk <wd@denx.de> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: U-Boot DM <u-boot-dm@lists.denx.de> Cc: Tom Rini <trini@ti.com> Acked-by: Tom Rini <trini@ti.com> Signed-off-by: Tom Rini <trini@ti.com>
Diffstat (limited to 'drivers/gpio/omap_gpio.c')
-rw-r--r--drivers/gpio/omap_gpio.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/drivers/gpio/omap_gpio.c b/drivers/gpio/omap_gpio.c
new file mode 100644
index 0000000..fc89f2a
--- /dev/null
+++ b/drivers/gpio/omap_gpio.c
@@ -0,0 +1,243 @@
+/*
+ * 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/gpio.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+
+#define OMAP_GPIO_DIR_OUT 0
+#define OMAP_GPIO_DIR_IN 1
+
+static inline const struct gpio_bank *get_gpio_bank(int gpio)
+{
+ return &omap_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(const struct gpio_bank *bank, int gpio,
+ int is_input)
+{
+ void *reg = bank->base;
+ u32 l;
+
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ reg += OMAP_GPIO_OE;
+ break;
+ default:
+ return;
+ }
+ l = __raw_readl(reg);
+ if (is_input)
+ l |= 1 << gpio;
+ else
+ l &= ~(1 << gpio);
+ __raw_writel(l, reg);
+}
+
+/**
+ * Get the direction of the GPIO by reading the GPIO_OE register
+ * corresponding to the specified bank.
+ */
+static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
+{
+ void *reg = bank->base;
+ u32 v;
+
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ reg += OMAP_GPIO_OE;
+ break;
+ default:
+ return -1;
+ }
+
+ v = __raw_readl(reg);
+
+ if (v & (1 << gpio))
+ return OMAP_GPIO_DIR_IN;
+ else
+ return OMAP_GPIO_DIR_OUT;
+}
+
+static void _set_gpio_dataout(const 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 += OMAP_GPIO_SETDATAOUT;
+ else
+ reg += OMAP_GPIO_CLEARDATAOUT;
+ l = 1 << gpio;
+ break;
+ default:
+ printf("omap3-gpio unknown bank method %s %d\n",
+ __FILE__, __LINE__);
+ return;
+ }
+ __raw_writel(l, reg);
+}
+
+/**
+ * Set value of the specified gpio
+ */
+int gpio_set_value(unsigned gpio, int value)
+{
+ const struct gpio_bank *bank;
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+ bank = get_gpio_bank(gpio);
+ _set_gpio_dataout(bank, get_gpio_index(gpio), value);
+
+ return 0;
+}
+
+/**
+ * Get value of the specified gpio
+ */
+int gpio_get_value(unsigned gpio)
+{
+ const struct gpio_bank *bank;
+ void *reg;
+ int input;
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+ bank = get_gpio_bank(gpio);
+ reg = bank->base;
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ input = _get_gpio_direction(bank, get_gpio_index(gpio));
+ switch (input) {
+ case OMAP_GPIO_DIR_IN:
+ reg += OMAP_GPIO_DATAIN;
+ break;
+ case OMAP_GPIO_DIR_OUT:
+ reg += OMAP_GPIO_DATAOUT;
+ break;
+ default:
+ return -1;
+ }
+ break;
+ default:
+ return -1;
+ }
+ return (__raw_readl(reg)
+ & (1 << get_gpio_index(gpio))) != 0;
+}
+
+/**
+ * Set gpio direction as input
+ */
+int gpio_direction_input(unsigned gpio)
+{
+ const struct gpio_bank *bank;
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ bank = get_gpio_bank(gpio);
+ _set_gpio_direction(bank, get_gpio_index(gpio), 1);
+
+ return 0;
+}
+
+/**
+ * Set gpio direction as output
+ */
+int gpio_direction_output(unsigned gpio, int value)
+{
+ const struct gpio_bank *bank;
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ bank = get_gpio_bank(gpio);
+ _set_gpio_dataout(bank, get_gpio_index(gpio), value);
+ _set_gpio_direction(bank, get_gpio_index(gpio), 0);
+
+ return 0;
+}
+
+/**
+ * Request a gpio before using it.
+ *
+ * NOTE: Argument 'label' is unused.
+ */
+int gpio_request(unsigned gpio, const char *label)
+{
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ return 0;
+}
+
+/**
+ * Reset and free the gpio after using it.
+ */
+int gpio_free(unsigned gpio)
+{
+ return 0;
+}