3 files changed, 407 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 74603ca06e34..8482a23887dc 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -99,6 +99,14 @@ config GPIO_MPC5200
         def_bool y
         depends on PPC_MPC52xx
 
+config GPIO_MPC8XXX
+        bool "MPC512x/MPC8xxx GPIO support"
+        depends on PPC_MPC512x || PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || \
+                   FSL_SOC_BOOKE || PPC_86xx
+        help
+          Say Y here if you're going to use hardware that connects to the
+          MPC512x/831x/834x/837x/8572/8610 GPIOs.
+
 config GPIO_MSM_V1
         tristate "Qualcomm MSM GPIO v1"
         depends on GPIOLIB && ARCH_MSM
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4a9ad2f99ada..dbcb0bcfd8da 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_GPIO_MC33880)	+= gpio-mc33880.o
 obj-$(CONFIG_GPIO_MCP23S08)     += gpio-mcp23s08.o
 obj-$(CONFIG_GPIO_ML_IOH)       += gpio-ml-ioh.o
 obj-$(CONFIG_GPIO_MPC5200)      += gpio-mpc5200.o
+obj-$(CONFIG_GPIO_MPC8XXX)      += gpio-mpc8xxx.o
 obj-$(CONFIG_GPIO_MSM_V1)       += gpio-msm-v1.o
 obj-$(CONFIG_GPIO_MSM_V2)       += gpio-msm-v2.o
 obj-$(CONFIG_GPIO_MXC)          += gpio-mxc.o
diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
new file mode 100644
index 000000000000..ec3fcf0a7e12
--- /dev/null
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -0,0 +1,398 @@
+/*
+ * 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 irq_chip *chip = irq_desc_get_chip(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)));
+        chip->irq_eoi(&desc->irq_data);
+}
+
+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)));
+                spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int mpc512x_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 gpio = irqd_to_hwirq(d);
+        void __iomem *reg;
+        unsigned int shift;
+        unsigned long flags;
+
+        if (gpio < 16) {
+                reg = mm->regs + GPIO_ICR;
+                shift = (15 - gpio) * 2;
+        } else {
+                reg = mm->regs + GPIO_ICR2;
+                shift = (15 - (gpio % 16)) * 2;
+        }
+
+        switch (flow_type) {
+        case IRQ_TYPE_EDGE_FALLING:
+        case IRQ_TYPE_LEVEL_LOW:
+                spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+                clrsetbits_be32(reg, 3 << shift, 2 << shift);
+                spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+                break;
+
+        case IRQ_TYPE_EDGE_RISING:
+        case IRQ_TYPE_LEVEL_HIGH:
+                spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+                clrsetbits_be32(reg, 3 << shift, 1 << shift);
+                spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+                break;
+
+        case IRQ_TYPE_EDGE_BOTH:
+                spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+                clrbits32(reg, 3 << shift);
+                spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct irq_chip mpc8xxx_irq_chip = {
+        .name           = "mpc8xxx-gpio",
+        .irq_unmask     = mpc8xxx_irq_unmask,
+        .irq_mask       = mpc8xxx_irq_mask,
+        .irq_ack        = mpc8xxx_irq_ack,
+        .irq_set_type   = mpc8xxx_irq_set_type,
+};
+
+static int mpc8xxx_gpio_irq_map(struct irq_host *h, unsigned int virq,
+                                irq_hw_number_t hw)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc = h->host_data;
+
+        if (mpc8xxx_gc->of_dev_id_data)
+                mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data;
+
+        irq_set_chip_data(virq, h->host_data);
+        irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
+        irq_set_irq_type(virq, IRQ_TYPE_NONE);
+
+        return 0;
+}
+
+static int mpc8xxx_gpio_irq_xlate(struct irq_host *h, struct device_node *ct,
+                                  const u32 *intspec, unsigned int intsize,
+                                  irq_hw_number_t *out_hwirq,
+                                  unsigned int *out_flags)
+
+{
+        /* interrupt sense values coming from the device tree equal either
+         * EDGE_FALLING or EDGE_BOTH
+         */
+        *out_hwirq = intspec[0];
+        *out_flags = intspec[1];
+
+        return 0;
+}
+
+static struct irq_host_ops mpc8xxx_gpio_irq_ops = {
+        .map    = mpc8xxx_gpio_irq_map,
+        .xlate  = mpc8xxx_gpio_irq_xlate,
+};
+
+static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
+        { .compatible = "fsl,mpc8349-gpio", },
+        { .compatible = "fsl,mpc8572-gpio", },
+        { .compatible = "fsl,mpc8610-gpio", },
+        { .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, },
+        { .compatible = "fsl,pq3-gpio",     },
+        { .compatible = "fsl,qoriq-gpio",   },
+        {}
+};
+
+static void __init mpc8xxx_add_controller(struct device_node *np)
+{
+        struct mpc8xxx_gpio_chip *mpc8xxx_gc;
+        struct of_mm_gpio_chip *mm_gc;
+        struct gpio_chip *gc;
+        const struct of_device_id *id;
+        unsigned hwirq;
+        int ret;
+
+        mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
+        if (!mpc8xxx_gc) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        spin_lock_init(&mpc8xxx_gc->lock);
+
+        mm_gc = &mpc8xxx_gc->mm_gc;
+        gc = &mm_gc->gc;
+
+        mm_gc->save_regs = mpc8xxx_gpio_save_regs;
+        gc->ngpio = MPC8XXX_GPIO_PINS;
+        gc->direction_input = mpc8xxx_gpio_dir_in;
+        gc->direction_output = mpc8xxx_gpio_dir_out;
+        if (of_device_is_compatible(np, "fsl,mpc8572-gpio"))
+                gc->get = mpc8572_gpio_get;
+        else
+                gc->get = mpc8xxx_gpio_get;
+        gc->set = mpc8xxx_gpio_set;
+        gc->to_irq = mpc8xxx_gpio_to_irq;
+
+        ret = of_mm_gpiochip_add(np, mm_gc);
+        if (ret)
+                goto err;
+
+        hwirq = irq_of_parse_and_map(np, 0);
+        if (hwirq == NO_IRQ)
+                goto skip_irq;
+
+        mpc8xxx_gc->irq =
+                irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, MPC8XXX_GPIO_PINS,
+                               &mpc8xxx_gpio_irq_ops, MPC8XXX_GPIO_PINS);
+        if (!mpc8xxx_gc->irq)
+                goto skip_irq;
+
+        id = of_match_node(mpc8xxx_gpio_ids, np);
+        if (id)
+                mpc8xxx_gc->of_dev_id_data = id->data;
+
+        mpc8xxx_gc->irq->host_data = mpc8xxx_gc;
+
+        /* ack and mask all irqs */
+        out_be32(mm_gc->regs + GPIO_IER, 0xffffffff);
+        out_be32(mm_gc->regs + GPIO_IMR, 0);
+
+        irq_set_handler_data(hwirq, mpc8xxx_gc);
+        irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade);
+
+skip_irq:
+        return;
+
+err:
+        pr_err("%s: registration failed with status %d\n",
+               np->full_name, ret);
+        kfree(mpc8xxx_gc);
+
+        return;
+}
+
+static int __init mpc8xxx_add_gpiochips(void)
+{
+        struct device_node *np;
+
+        for_each_matching_node(np, mpc8xxx_gpio_ids)
+                mpc8xxx_add_controller(np);
+
+        return 0;
+}
+arch_initcall(mpc8xxx_add_gpiochips);