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authorGuennadi Liakhovetski <lg@denx.de>2009-02-07 01:18:07 +0100
committerAnatolij Gustschin <agust@denx.de>2009-02-24 09:43:10 +0100
commitb30de3cccf8867566cd314e7c7033904afa5dc9d (patch)
treed0bfc0fc195bba02b2887e6bd34bdbda7af1e5d6 /drivers/gpio/mx31_gpio.c
parentf9b6a1575d9f1ca192e4cb60e547aa66f08baa3f (diff)
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i.MX31: add a simple gpio driver
This is a minimal driver, so far only managing output. It will be used by the mxc_spi.c driver. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'drivers/gpio/mx31_gpio.c')
-rw-r--r--drivers/gpio/mx31_gpio.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/gpio/mx31_gpio.c b/drivers/gpio/mx31_gpio.c
new file mode 100644
index 0000000..737aafa
--- /dev/null
+++ b/drivers/gpio/mx31_gpio.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * 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/mx31.h>
+#include <asm/arch/mx31-regs.h>
+
+/* GPIO port description */
+static unsigned long gpio_ports[] = {
+ [0] = GPIO1_BASE,
+ [1] = GPIO2_BASE,
+ [2] = GPIO3_BASE,
+};
+
+int mx31_gpio_direction(unsigned int gpio, enum mx31_gpio_direction direction)
+{
+ unsigned int port = gpio >> 5;
+ u32 l;
+
+ if (port >= ARRAY_SIZE(gpio_ports))
+ return 1;
+
+ gpio &= 0x1f;
+
+ l = __REG(gpio_ports[port] + GPIO_GDIR);
+ switch (direction) {
+ case MX31_GPIO_DIRECTION_OUT:
+ l |= 1 << gpio;
+ break;
+ case MX31_GPIO_DIRECTION_IN:
+ l &= ~(1 << gpio);
+ }
+ __REG(gpio_ports[port] + GPIO_GDIR) = l;
+
+ return 0;
+}
+
+void mx31_gpio_set(unsigned int gpio, unsigned int value)
+{
+ unsigned int port = gpio >> 5;
+ u32 l;
+
+ if (port >= ARRAY_SIZE(gpio_ports))
+ return;
+
+ gpio &= 0x1f;
+
+ l = __REG(gpio_ports[port] + GPIO_DR);
+ if (value)
+ l |= 1 << gpio;
+ else
+ l &= ~(1 << gpio);
+ __REG(gpio_ports[port] + GPIO_DR) = l;
+}