1 files changed, 302 insertions, 0 deletions

diff --git a/arch/arm/mach-at91rm9200/gpio.c b/arch/arm/mach-at91rm9200/gpio.c
new file mode 100644
index 000000000000..2fd2ef583e4d
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/gpio.c
@@ -0,0 +1,302 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/gpio.c
+ *
+ * Copyright (C) 2005 HP Labs
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/mach/irq.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/gpio.h>
+
+static const u32 pio_controller_offset[4] = {
+        AT91_PIOA,
+        AT91_PIOB,
+        AT91_PIOC,
+        AT91_PIOD,
+};
+
+static inline void __iomem *pin_to_controller(unsigned pin)
+{
+        void __iomem *sys_base = (void __iomem *) AT91_VA_BASE_SYS;
+
+        pin -= PIN_BASE;
+        pin /= 32;
+        if (likely(pin < BGA_GPIO_BANKS))
+                return sys_base + pio_controller_offset[pin];
+
+        return NULL;
+}
+
+static inline unsigned pin_to_mask(unsigned pin)
+{
+        pin -= PIN_BASE;
+        return 1 << (pin % 32);
+}
+
+
+/*--------------------------------------------------------------------------*/
+
+/* Not all hardware capabilities are exposed through these calls; they
+ * only encapsulate the most common features and modes.  (So if you
+ * want to change signals in groups, do it directly.)
+ *
+ * Bootloaders will usually handle some of the pin multiplexing setup.
+ * The intent is certainly that by the time Linux is fully booted, all
+ * pins should have been fully initialized.  These setup calls should
+ * only be used by board setup routines, or possibly in driver probe().
+ *
+ * For bootloaders doing all that setup, these calls could be inlined
+ * as NOPs so Linux won't duplicate any setup code
+ */
+
+
+/*
+ * mux the pin to the "A" internal peripheral role.
+ */
+int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+
+        __raw_writel(mask, pio + PIO_IDR);
+        __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+        __raw_writel(mask, pio + PIO_ASR);
+        __raw_writel(mask, pio + PIO_PDR);
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_A_periph);
+
+
+/*
+ * mux the pin to the "B" internal peripheral role.
+ */
+int __init_or_module at91_set_B_periph(unsigned pin, int use_pullup)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+
+        __raw_writel(mask, pio + PIO_IDR);
+        __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+        __raw_writel(mask, pio + PIO_BSR);
+        __raw_writel(mask, pio + PIO_PDR);
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_B_periph);
+
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and
+ * configure it for an input.
+ */
+int __init_or_module at91_set_gpio_input(unsigned pin, int use_pullup)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+
+        __raw_writel(mask, pio + PIO_IDR);
+        __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+        __raw_writel(mask, pio + PIO_ODR);
+        __raw_writel(mask, pio + PIO_PER);
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_input);
+
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral),
+ * and configure it for an output.
+ */
+int __init_or_module at91_set_gpio_output(unsigned pin, int value)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+
+        __raw_writel(mask, pio + PIO_IDR);
+        __raw_writel(mask, pio + PIO_PUDR);
+        __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
+        __raw_writel(mask, pio + PIO_OER);
+        __raw_writel(mask, pio + PIO_PER);
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_output);
+
+
+/*
+ * enable/disable the glitch filter; mostly used with IRQ handling.
+ */
+int __init_or_module at91_set_deglitch(unsigned pin, int is_on)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+        __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_deglitch);
+
+/*--------------------------------------------------------------------------*/
+
+
+/*
+ * assuming the pin is muxed as a gpio output, set its value.
+ */
+int at91_set_gpio_value(unsigned pin, int value)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (!pio)
+                return -EINVAL;
+        __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
+        return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_value);
+
+
+/*
+ * read the pin's value (works even if it's not muxed as a gpio).
+ */
+int at91_get_gpio_value(unsigned pin)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+        u32             pdsr;
+
+        if (!pio)
+                return -EINVAL;
+        pdsr = __raw_readl(pio + PIO_PDSR);
+        return (pdsr & mask) != 0;
+}
+EXPORT_SYMBOL(at91_get_gpio_value);
+
+/*--------------------------------------------------------------------------*/
+
+
+/* Several AIC controller irqs are dispatched through this GPIO handler.
+ * To use any AT91_PIN_* as an externally triggered IRQ, first call
+ * at91_set_gpio_input() then maybe enable its glitch filter.
+ * Then just request_irq() with the pin ID; it works like any ARM IRQ
+ * handler, though it always triggers on rising and falling edges.
+ *
+ * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
+ * configuring them with at91_set_a_periph() or at91_set_b_periph().
+ * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
+ */
+
+static void gpio_irq_mask(unsigned pin)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (pio)
+                __raw_writel(mask, pio + PIO_IDR);
+}
+
+static void gpio_irq_unmask(unsigned pin)
+{
+        void __iomem    *pio = pin_to_controller(pin);
+        unsigned        mask = pin_to_mask(pin);
+
+        if (pio)
+                __raw_writel(mask, pio + PIO_IER);
+}
+
+static int gpio_irq_type(unsigned pin, unsigned type)
+{
+        return (type == IRQT_BOTHEDGE) ? 0 : -EINVAL;
+}
+
+static struct irqchip gpio_irqchip = {
+        .mask           = gpio_irq_mask,
+        .unmask         = gpio_irq_unmask,
+        .set_type       = gpio_irq_type,
+};
+
+static void gpio_irq_handler(unsigned irq, struct irqdesc *desc, struct pt_regs *regs)
+{
+        unsigned        pin;
+        struct irqdesc  *gpio;
+        void __iomem    *pio;
+        u32             isr;
+
+        pio = (void __force __iomem *) desc->chipdata;
+
+        /* temporarily mask (level sensitive) parent IRQ */
+        desc->chip->ack(irq);
+        for (;;) {
+                isr = __raw_readl(pio + PIO_ISR) & __raw_readl(pio + PIO_IMR);
+                if (!isr)
+                        break;
+
+                pin = (unsigned) desc->data;
+                gpio = &irq_desc[pin];
+
+                while (isr) {
+                        if (isr & 1)
+                                gpio->handle(pin, gpio, regs);
+                        pin++;
+                        gpio++;
+                        isr >>= 1;
+                }
+        }
+        desc->chip->unmask(irq);
+        /* now it may re-trigger */
+}
+
+/* call this from board-specific init_irq */
+void __init at91_gpio_irq_setup(unsigned banks)
+{
+        unsigned        pioc, pin, id;
+
+        if (banks > 4)
+                banks = 4;
+        for (pioc = 0, pin = PIN_BASE, id = AT91_ID_PIOA;
+                        pioc < banks;
+                        pioc++, id++) {
+                void __iomem    *controller;
+                unsigned        i;
+
+                controller = (void __iomem *) AT91_VA_BASE_SYS + pio_controller_offset[pioc];
+                __raw_writel(~0, controller + PIO_IDR);
+
+                set_irq_data(id, (void *) pin);
+                set_irq_chipdata(id, (void __force *) controller);
+
+                for (i = 0; i < 32; i++, pin++) {
+                        set_irq_chip(pin, &gpio_irqchip);
+                        set_irq_handler(pin, do_simple_IRQ);
+                        set_irq_flags(pin, IRQF_VALID);
+                }
+
+                set_irq_chained_handler(id, gpio_irq_handler);
+
+                /* enable the PIO peripheral clock */
+                at91_sys_write(AT91_PMC_PCER, 1 << id);
+        }
+        pr_info("AT91: %d gpio irqs in %d banks\n", pin - PIN_BASE, banks);
+}