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path: root/drivers/gpio/at91_gpio.c
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Diffstat (limited to 'drivers/gpio/at91_gpio.c')
-rw-r--r--drivers/gpio/at91_gpio.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
new file mode 100644
index 0000000..c0a97bc
--- /dev/null
+++ b/drivers/gpio/at91_gpio.c
@@ -0,0 +1,214 @@
+/*
+ * Memory Setup stuff - taken from blob memsetup.S
+ *
+ * Copyright (C) 2009 Jens Scharsig (js_at_ng@scharsoft.de)
+ *
+ * Copyright (C) 2005 HP Labs
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <asm/sizes.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/io.h>
+#include <asm/arch/at91_pio.h>
+
+int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ if (use_pullup)
+ writel(1 << pin, &pio->port[port].puer);
+ else
+ writel(1 << pin, &pio->port[port].pudr);
+ writel(mask, &pio->port[port].per);
+ }
+ return 0;
+}
+
+/*
+ * mux the pin to the "GPIO" peripheral role.
+ */
+int at91_set_pio_periph(unsigned port, unsigned pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ writel(mask, &pio->port[port].idr);
+ at91_set_pio_pullup(port, pin, use_pullup);
+ writel(mask, &pio->port[port].per);
+ }
+ return 0;
+}
+
+/*
+ * mux the pin to the "A" internal peripheral role.
+ */
+int at91_set_a_periph(unsigned port, unsigned pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ writel(mask, &pio->port[port].idr);
+ at91_set_pio_pullup(port, pin, use_pullup);
+ writel(mask, &pio->port[port].asr);
+ writel(mask, &pio->port[port].pdr);
+ }
+ return 0;
+}
+
+/*
+ * mux the pin to the "B" internal peripheral role.
+ */
+int at91_set_b_periph(unsigned port, unsigned pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ writel(mask, &pio->port[port].idr);
+ at91_set_pio_pullup(port, pin, use_pullup);
+ writel(mask, &pio->port[port].bsr);
+ writel(mask, &pio->port[port].pdr);
+ }
+ return 0;
+}
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and
+ * configure it for an input.
+ */
+int at91_set_pio_input(unsigned port, u32 pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ writel(mask, &pio->port[port].idr);
+ at91_set_pio_pullup(port, pin, use_pullup);
+ writel(mask, &pio->port[port].odr);
+ writel(mask, &pio->port[port].per);
+ }
+ return 0;
+}
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral),
+ * and configure it for an output.
+ */
+int at91_set_pio_output(unsigned port, u32 pin, int value)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ writel(mask, &pio->port[port].idr);
+ writel(mask, &pio->port[port].pudr);
+ if (value)
+ writel(mask, &pio->port[port].sodr);
+ else
+ writel(mask, &pio->port[port].codr);
+ writel(mask, &pio->port[port].oer);
+ writel(mask, &pio->port[port].per);
+ }
+ return 0;
+}
+
+/*
+ * enable/disable the glitch filter. mostly used with IRQ handling.
+ */
+int at91_set_pio_deglitch(unsigned port, unsigned pin, int is_on)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ if (is_on)
+ writel(mask, &pio->port[port].ifer);
+ else
+ writel(mask, &pio->port[port].ifdr);
+ }
+ return 0;
+}
+
+/*
+ * enable/disable the multi-driver. This is only valid for output and
+ * allows the output pin to run as an open collector output.
+ */
+int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ if (is_on)
+ writel(mask, &pio->port[port].mder);
+ else
+ writel(mask, &pio->port[port].mddr);
+ }
+ return 0;
+}
+
+/*
+ * assuming the pin is muxed as a gpio output, set its value.
+ */
+int at91_set_pio_value(unsigned port, unsigned pin, int value)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ if (value)
+ writel(mask, &pio->port[port].sodr);
+ else
+ writel(mask, &pio->port[port].codr);
+ }
+ return 0;
+}
+
+/*
+ * read the pin's value (works even if it's not muxed as a gpio).
+ */
+int at91_get_pio_value(unsigned port, unsigned pin)
+{
+ u32 pdsr = 0;
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 mask;
+
+ if ((port < AT91_PIO_PORTS) && (pin < 32)) {
+ mask = 1 << pin;
+ pdsr = readl(&pio->port[port].pdsr) & mask;
+ }
+ return pdsr != 0;
+}