ENGR00108673 Add i.MX25 core to U-Boot

This patch add support on U-Boot to i.MX25 processor.

Signed-off-by: Alan Carvalho de Assis <alan.assis@freescale.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/cpu/arm926ejs/mx25/gpio.c b/cpu/arm926ejs/mx25/gpio.c
new file mode 100644
index 0000000..560b3a4
--- /dev/null
+++ b/cpu/arm926ejs/mx25/gpio.c
@@ -0,0 +1,113 @@
+/*
+ * (c) Copyright 2009 Freescale Semiconductors
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/arch/mx25.h>
+#include <asm/arch/mx25_pins.h>
+#include <asm/arch/gpio.h>
+
+enum gpio_reg {
+	DR = 0x00,
+	GDIR = 0x04,
+	PSR = 0x08,
+	ICR1 = 0x0C,
+	ICR2 = 0x10,
+	IMR = 0x14,
+	ISR = 0x18,
+};
+
+struct gpio_port_addr {
+	int num;
+	int base;
+};
+
+struct gpio_port_addr gpio_port[4] = {
+				{0, GPIO1_BASE},
+				{1, GPIO2_BASE},
+				{2, GPIO3_BASE},
+				{3, GPIO4_BASE}
+				};
+
+/*
+ * Set a GPIO pin's direction
+ * @param port		pointer to a gpio_port
+ * @param index		gpio pin index value (0~31)
+ * @param is_input	0 for output; non-zero for input
+ */
+static void _set_gpio_direction(u32 port, u32 index, int is_input)
+{
+	u32 reg = gpio_port[port].base + GDIR;
+	u32 l;
+
+	l = __REG(reg);
+	if (is_input)
+		l &= ~(1 << index);
+	else
+		l |= 1 << index;
+	__REG(reg) = l;
+}
+
+
+/*!
+ * Exported function to set a GPIO pin's direction
+ * @param pin		a name defined by \b iomux_pin_name_t
+ * @param is_input	1 (or non-zero) for input; 0 for output
+ */
+void mxc_set_gpio_direction(iomux_pin_name_t pin, int is_input)
+{
+	u32 port;
+	u32 gpio = IOMUX_TO_GPIO(pin);
+
+	port = GPIO_TO_PORT(gpio);
+	_set_gpio_direction(port, GPIO_TO_INDEX(gpio), is_input);
+}
+
+/*
+ * Set a GPIO pin's data output
+ * @param port		number of gpio port
+ * @param index		gpio pin index value (0~31)
+ * @param data		value to be set (only 0 or 1 is valid)
+ */
+static void _set_gpio_dataout(u32 port, u32 index, u32 data)
+{
+	u32 reg = gpio_port[port].base + DR;
+	u32 l = 0;
+
+	l = (__REG(reg) & (~(1 << index))) | (data << index);
+	__REG(reg) = l;
+}
+
+/*!
+ * Exported function to set a GPIO pin's data output
+ * @param pin		a name defined by \b iomux_pin_name_t
+ * @param data		value to be set (only 0 or 1 is valid)
+ */
+
+void mxc_set_gpio_dataout(iomux_pin_name_t pin, u32 data)
+{
+	u32 port;
+	u32 gpio = IOMUX_TO_GPIO(pin);
+
+	port = GPIO_TO_PORT(gpio);
+	_set_gpio_dataout(port, GPIO_TO_INDEX(gpio), (data == 0) ? 0 : 1);
+}
+