add at91 SoC access with c structures

* add new at91_gpio driver, using c structure SoC access

---
 drivers/gpio/at91_gpio.c |  240
++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 240 insertions(+), 0 deletions(-)
 create mode 100644 drivers/gpio/at91_gpio.c

new file mode 100644
index 0000000..5e50ead
@@ -0,0 +1,240 @@
+/*
+ * Memory Setup stuff - taken from blob memsetup.S
+ *
+ * Copyright (C) 2009 Jens Scharsig (js_at_ng at 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>
+
+#define PIN_BASE		32
+
+u32 portpin_to_port(u32 portpin)
+{
+	return (portpin - PIN_BASE) / 32;
+}
+
+u32 portpin_to_pin(u32 portpin)
+{
+	return 1 << ((portpin - PIN_BASE) % 32);
+}
+
+/*
+ * mux the pin to the "GPIO" peripheral role.
+ */
+int at91_set_gpio_periph(unsigned pin, int use_pullup)
+{
+	at91_pio_t	*pio 	= (at91_pio_t *) AT91_PIO_BASE;
+	u32		port	= portpin_to_port(pin);
+	u32 		mask	= portpin_to_pin(pin);
+
+	writel(mask, &pio->port[port].idr);
+	if (use_pullup)
+		writel(mask, &pio->port[port].puer);
+	else
+		writel(mask, &pio->port[port].pudr);
+	writel(mask, &pio->port[port].per);
+
+	return 0;
+}
+
+/*
+ * mux the pin to the "A" internal peripheral role.
+ */
+int at91_set_a_periph(unsigned pin, int use_pullup)
+{
+	at91_pio_t	*pio 	= (at91_pio_t *) AT91_PIO_BASE;
+	u32		port	= portpin_to_port(pin);
+	u32 		mask	= portpin_to_pin(pin);
+
+	writel(mask, &pio->port[port].idr);
+	if (use_pullup)
+		writel(mask, &pio->port[port].puer);
+	else
+		writel(mask, &pio->port[port].pudr);
+	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 pin, int use_pullup)
+{
+	at91_pio_t	*pio 	= (at91_pio_t *) AT91_PIO_BASE;
+	u32		port	= portpin_to_port(pin);
+	u32 		mask	= portpin_to_pin(pin);
+
+	writel(mask, &pio->port[port].idr);
+	if (use_pullup)
+		writel(mask, &pio->port[port].puer);
+	else
+		writel(mask, &pio->port[port].pudr);
+	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_gpio_input(u32 pin, int use_pullup)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+
+ writel(mask, &pio->port[port].idr);
+ if (use_pullup)
+ writel(mask, &pio->port[port].puer);
+ else
+ writel(mask, &pio->port[port].pudr);
+ 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_gpio_output(u32 pin, int value)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(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_deglitch(unsigned pin, int is_on)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(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_multi_drive(unsigned pin, int is_on)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+
+ if (is_on)
+ writel(mask, &pio->port[port].mder);
+ else
+ writel(mask, &pio->port[port].mddr);
+ return 0;
+}
+
+/*
+int gpio_direction_input(unsigned pin)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+
+ if (!(readl(&pio->port[port].psr) & mask))
+ return -EINVAL;
+ writel(mask, &pio->port[port].odr);
+ return 0;
+}
+
+int gpio_direction_output(unsigned pin, int value)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+
+ if (!(readl(&pio->port[port].psr) & mask))
+ return -EINVAL;
+ if (value)
+ writel(mask, &pio->port[port].sodr);
+ else
+ writel(mask, &pio->port[port].codr);
+ writel(mask, &pio->port[port].oer);
+
+ return 0;
+}
+*/
+/*
+ * assuming the pin is muxed as a gpio output, set its value.
+ */
+int at91_set_gpio_value(unsigned pin, int value)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+
+ /* printf("%d = Port %d Pin %d (%d)",pin, port, mask, value); */
+ 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_gpio_value(unsigned pin)
+{
+ at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
+ u32 port = portpin_to_port(pin);
+ u32 mask = portpin_to_pin(pin);
+ u32 pdsr;
+
+ pdsr = readl(&pio->port[port]);
+ return (pdsr & mask) != 0;
+}
+

1.6.0.2