Added missing tegra files.HEADmaster

1 files changed, 395 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/mpc8xxx_gpio.c b/arch/powerpc/sysdev/mpc8xxx_gpio.c
new file mode 100644
index 00000000000..fb4963abdf5
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc8xxx_gpio.c
@@ -0,0 +1,395 @@
+/*
+ * GPIOs on MPC512x/8349/8572/8610 and compatible
+ *
+ * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+
+#define MPC8XXX_GPIO_PINS       32
+
+#define GPIO_DIR                0x00
+#define GPIO_ODR                0x04
+#define GPIO_DAT                0x08
+#define GPIO_IER                0x0c
+#define GPIO_IMR                0x10
+#define GPIO_ICR                0x14
+#define GPIO_ICR2               0x18
+
+struct mpc8xxx_gpio_chip {
+        struct of_mm_gpio_chip mm_gc;
+        spinlock_t lock;
+
+        /*
+         * shadowed data register to be able to clear/set output pins in
+         * open drain mode safely
+         */
+        u32 data;
+        struct irq_host *irq;
+        void *of_dev_id_data;
+};
+
+static inline u32 mpc8xxx_gpio2mask(unsigned int gpio)
+{
+        return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio);
+}
+
+static inline struct mpc8xxx_gpio_chip *
+to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm)
+{
+        return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc);
+}
+
+static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+
+        mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
+}
+
+/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
+ * defined as output cannot be determined by reading GPDAT register,
+ * so we use shadow data register instead. The status of input pins
+ * is determined by reading GPDAT register.
+ */
+static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+        u32 val;
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+
+        val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR);
+
+        return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio);
+}
+
+static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+
+        return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio);
+}
+
+static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+        unsigned long flags;
+
+        spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+        if (val)
+                mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio);
+        else
+                mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio);
+
+        out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
+
+        spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+}
+
+static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+        unsigned long flags;
+
+        spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+        clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
+
+        spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+
+        return 0;
+}
+
+static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+        unsigned long flags;
+
+        mpc8xxx_gpio_set(gc, gpio, val);
+
+        spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+        setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
+
+        spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+
+        return 0;
+}
+
+static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+        struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+
+        if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
+                return irq_create_mapping(mpc8xxx_gc->irq, offset);
+        else
+                return -ENXIO;
+}
+
+static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
+        struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
+        unsigned int mask;
+
+        mask = in_be32(mm->regs + GPIO_IER) & in_be32(mm->regs + GPIO_IMR);
+        if (mask)
+                generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
+                                                     32 - ffs(mask)));
+}
+
+static void mpc8xxx_irq_unmask(struct irq_data *d)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
+        struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
+        unsigned long flags;
+
+        spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+        setbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
+
+        spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+}
+
+static void mpc8xxx_irq_mask(struct irq_data *d)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
+        struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
+        unsigned long flags;
+
+        spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+        clrbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
+
+        spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+}
+
+static void mpc8xxx_irq_ack(struct irq_data *d)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
+        struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
+
+        out_be32(mm->regs + GPIO_IER, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
+}
+
+static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
+        struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
+        unsigned long flags;
+
+        switch (flow_type) {
+        case IRQ_TYPE_EDGE_FALLING:
+                spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+                setbits32(mm->regs + GPIO_ICR,
+                          mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
+                spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+                break;
+
+        case IRQ_TYPE_EDGE_BOTH:
+                spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+                clrbits32(mm->regs + GPIO_ICR,
+                          mpc8xxx_gpio2mask(irqd_to_hwirq(d)));