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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-09-01 14:00:07 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-09-01 14:38:46 +0200
commitbaf449fc5ff96f071bb0e3789fd3265f6d4fd9a0 (patch)
tree33cbca3aa08a0198d7076df0b73631dbe42f8664 /cpu
parentd92852579546c46bdaac978e0b6767a6645b69e0 (diff)
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avr32: Add support for "GPIO" port mux
The "GPIO" port mux is used on AVR32 UC3 parts as well as AT32AP7200 and all later AVR32 chips. This patch adds a driver for it, implementing the same API as the existing portmux-pio driver but with more functionality. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'cpu')
-rw-r--r--cpu/at32ap/Makefile1
-rw-r--r--cpu/at32ap/portmux-gpio.c107
2 files changed, 108 insertions, 0 deletions
diff --git a/cpu/at32ap/Makefile b/cpu/at32ap/Makefile
index 100cf3e..e08f273 100644
--- a/cpu/at32ap/Makefile
+++ b/cpu/at32ap/Makefile
@@ -35,6 +35,7 @@ COBJS-y += exception.o
COBJS-y += cache.o
COBJS-y += interrupts.o
COBJS-$(CONFIG_PORTMUX_PIO) += portmux-pio.o
+COBJS-$(CONFIG_PORTMUX_GPIO) += portmux-gpio.o
SRCS := $(START-y:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
diff --git a/cpu/at32ap/portmux-gpio.c b/cpu/at32ap/portmux-gpio.c
new file mode 100644
index 0000000..9acd040
--- /dev/null
+++ b/cpu/at32ap/portmux-gpio.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * 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/io.h>
+#include <asm/arch/memory-map.h>
+#include <asm/arch/gpio.h>
+
+void portmux_select_peripheral(void *port, unsigned long pin_mask,
+ enum portmux_function func, unsigned long flags)
+{
+ /* Both pull-up and pull-down set means buskeeper */
+ if (flags & PORTMUX_PULL_DOWN)
+ gpio_writel(port, PDERS, pin_mask);
+ else
+ gpio_writel(port, PDERC, pin_mask);
+ if (flags & PORTMUX_PULL_UP)
+ gpio_writel(port, PUERS, pin_mask);
+ else
+ gpio_writel(port, PUERC, pin_mask);
+
+ /* Select drive strength */
+ if (flags & PORTMUX_DRIVE_LOW)
+ gpio_writel(port, ODCR0S, pin_mask);
+ else
+ gpio_writel(port, ODCR0C, pin_mask);
+ if (flags & PORTMUX_DRIVE_HIGH)
+ gpio_writel(port, ODCR1S, pin_mask);
+ else
+ gpio_writel(port, ODCR1C, pin_mask);
+
+ /* Select function */
+ if (func & PORTMUX_FUNC_B)
+ gpio_writel(port, PMR0S, pin_mask);
+ else
+ gpio_writel(port, PMR0C, pin_mask);
+ if (func & PORTMUX_FUNC_C)
+ gpio_writel(port, PMR1S, pin_mask);
+ else
+ gpio_writel(port, PMR1C, pin_mask);
+
+ /* Disable GPIO (i.e. enable peripheral) */
+ gpio_writel(port, GPERC, pin_mask);
+}
+
+void portmux_select_gpio(void *port, unsigned long pin_mask,
+ unsigned long flags)
+{
+ /* Both pull-up and pull-down set means buskeeper */
+ if (flags & PORTMUX_PULL_DOWN)
+ gpio_writel(port, PDERS, pin_mask);
+ else
+ gpio_writel(port, PDERC, pin_mask);
+ if (flags & PORTMUX_PULL_UP)
+ gpio_writel(port, PUERS, pin_mask);
+ else
+ gpio_writel(port, PUERC, pin_mask);
+
+ /* Enable open-drain mode if requested */
+ if (flags & PORTMUX_OPEN_DRAIN)
+ gpio_writel(port, ODMERS, pin_mask);
+ else
+ gpio_writel(port, ODMERC, pin_mask);
+
+ /* Select drive strength */
+ if (flags & PORTMUX_DRIVE_LOW)
+ gpio_writel(port, ODCR0S, pin_mask);
+ else
+ gpio_writel(port, ODCR0C, pin_mask);
+ if (flags & PORTMUX_DRIVE_HIGH)
+ gpio_writel(port, ODCR1S, pin_mask);
+ else
+ gpio_writel(port, ODCR1C, pin_mask);
+
+ /* Select direction and initial pin state */
+ if (flags & PORTMUX_DIR_OUTPUT) {
+ if (flags & PORTMUX_INIT_HIGH)
+ gpio_writel(port, OVRS, pin_mask);
+ else
+ gpio_writel(port, OVRC, pin_mask);
+ gpio_writel(port, ODERS, pin_mask);
+ } else {
+ gpio_writel(port, ODERC, pin_mask);
+ }
+
+ /* Enable GPIO */
+ gpio_writel(port, GPERS, pin_mask);
+}