add a new AT91 GPIO driver

* add a real AT91 GPIO driver instead of header inline code
* resolve the mixing of port and pins
* change board config files to use new driver
* add macros to gpio to realize backward compatibility

Signed-off-by: Jens Scharsig <js_at_ng@scharsoft.de>

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;
+}