1 files changed, 444 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
new file mode 100644
index 000000000..60c2533a3
--- /dev/null
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -0,0 +1,444 @@
+/*
+ * GPIOs on MPC512x/8349/8572/8610/QorIQ and compatible
+ *
+ * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
+ * Copyright (C) 2016 Freescale Semiconductor Inc.
+ *
+ * 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/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/gpio/driver.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.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
+#define GPIO_IBE		0x18
+
+struct mpc8xxx_gpio_chip {
+	struct gpio_chip	gc;
+	void __iomem *regs;
+	raw_spinlock_t lock;
+
+	int (*direction_output)(struct gpio_chip *chip,
+				unsigned offset, int value);
+
+	struct irq_domain *irq;
+	unsigned int irqn;
+};
+
+/*
+ * This hardware has a big endian bit assignment such that GPIO line 0 is
+ * connected to bit 31, line 1 to bit 30 ... line 31 to bit 0.
+ * This inline helper give the right bitmask for a certain line.
+ */
+static inline u32 mpc_pin2mask(unsigned int offset)
+{
+	return BIT(31 - offset);
+}
+
+/* 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 mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
+	u32 out_mask, out_shadow;
+
+	out_mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
+	val = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) & ~out_mask;
+	out_shadow = gc->bgpio_data & out_mask;
+
+	return !!((val | out_shadow) & mpc_pin2mask(gpio));
+}
+
+static int mpc5121_gpio_dir_out(struct gpio_chip *gc,
+				unsigned int gpio, int val)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
+	/* GPIO 28..31 are input only on MPC5121 */
+	if (gpio >= 28)
+		return -EINVAL;
+
+	return mpc8xxx_gc->direction_output(gc, gpio, val);
+}
+
+static int mpc5125_gpio_dir_out(struct gpio_chip *gc,
+				unsigned int gpio, int val)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
+	/* GPIO 0..3 are input only on MPC5125 */
+	if (gpio <= 3)
+		return -EINVAL;
+
+	return mpc8xxx_gc->direction_output(gc, gpio, val);
+}
+
+static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
+
+	if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
+		return irq_create_mapping(mpc8xxx_gc->irq, offset);
+	else
+		return -ENXIO;
+}
+
+static irqreturn_t mpc8xxx_gpio_irq_cascade(int irq, void *data)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = data;
+	struct gpio_chip *gc = &mpc8xxx_gc->gc;
+	unsigned long mask;
+	int i;
+
+	mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_IER)
+		& gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR);
+	for_each_set_bit(i, &mask, 32)
+		generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq, 31 - i));
+
+	return IRQ_HANDLED;
+}
+
+static void mpc8xxx_irq_unmask(struct irq_data *d)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = &mpc8xxx_gc->gc;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
+		gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
+		| mpc_pin2mask(irqd_to_hwirq(d)));
+
+	raw_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 gpio_chip *gc = &mpc8xxx_gc->gc;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
+		gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
+		& ~mpc_pin2mask(irqd_to_hwirq(d)));
+
+	raw_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 gpio_chip *gc = &mpc8xxx_gc->gc;
+
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER,
+		      mpc_pin2mask(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 gpio_chip *gc = &mpc8xxx_gc->gc;
+	unsigned long flags;
+
+	switch (flow_type) {
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_LEVEL_LOW:
+		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+		gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
+			gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
+			| mpc_pin2mask(irqd_to_hwirq(d)));
+		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+		gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
+			gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
+			& ~mpc_pin2mask(irqd_to_hwirq(d)));
+		raw_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 gpio_chip *gc = &mpc8xxx_gc->gc;
+	unsigned long gpio = irqd_to_hwirq(d);
+	void __iomem *reg;
+	unsigned int shift;
+	unsigned long flags;
+
+	if (gpio < 16) {
+		reg = mpc8xxx_gc->regs + GPIO_ICR;
+		shift = (15 - gpio) * 2;
+	} else {
+		reg = mpc8xxx_gc->regs + GPIO_ICR2;
+		shift = (15 - (gpio % 16)) * 2;
+	}
+
+	switch (flow_type) {
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_LEVEL_LOW:
+		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
+			| (2 << shift));
+		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_LEVEL_HIGH:
+		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
+			| (1 << shift));
+		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift)));
+		raw_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,
+	/* this might get overwritten in mpc8xxx_probe() */
+	.irq_set_type	= mpc8xxx_irq_set_type,
+};
+
+static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int irq,
+				irq_hw_number_t hwirq)
+{
+	irq_set_chip_data(irq, h->host_data);
+	irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
+	.map	= mpc8xxx_gpio_irq_map,
+	.xlate	= irq_domain_xlate_twocell,
+};
+
+struct mpc8xxx_gpio_devtype {
+	int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
+	int (*gpio_get)(struct gpio_chip *, unsigned int);
+	int (*irq_set_type)(struct irq_data *, unsigned int);
+};
+
+static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
+	.gpio_dir_out = mpc5121_gpio_dir_out,
+	.irq_set_type = mpc512x_irq_set_type,
+};
+
+static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
+	.gpio_dir_out = mpc5125_gpio_dir_out,
+	.irq_set_type = mpc512x_irq_set_type,
+};
+
+static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
+	.gpio_get = mpc8572_gpio_get,
+};
+
+static const struct mpc8xxx_gpio_devtype mpc8xxx_gpio_devtype_default = {
+	.irq_set_type = mpc8xxx_irq_set_type,
+};
+
+static const struct of_device_id mpc8xxx_gpio_ids[] = {
+	{ .compatible = "fsl,mpc8349-gpio", },
+	{ .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
+	{ .compatible = "fsl,mpc8610-gpio", },
+	{ .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
+	{ .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
+	{ .compatible = "fsl,pq3-gpio",     },
+	{ .compatible = "fsl,ls1028a-gpio", },
+	{ .compatible = "fsl,ls1088a-gpio", },
+	{ .compatible = "fsl,qoriq-gpio",   },
+	{}
+};
+
+static int mpc8xxx_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
+	struct gpio_chip	*gc;
+	const struct mpc8xxx_gpio_devtype *devtype =
+		of_device_get_match_data(&pdev->dev);
+	int ret;
+
+	mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
+	if (!mpc8xxx_gc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mpc8xxx_gc);
+
+	raw_spin_lock_init(&mpc8xxx_gc->lock);
+
+	mpc8xxx_gc->regs = of_iomap(np, 0);
+	if (!mpc8xxx_gc->regs)
+		return -ENOMEM;
+
+	gc = &mpc8xxx_gc->gc;
+	gc->parent = &pdev->dev;
+
+	if (of_property_read_bool(np, "little-endian")) {
+		ret = bgpio_init(gc, &pdev->dev, 4,
+				 mpc8xxx_gc->regs + GPIO_DAT,
+				 NULL, NULL,
+				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
+				 BGPIOF_BIG_ENDIAN);
+		if (ret)
+			goto err;
+		dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
+	} else {
+		ret = bgpio_init(gc, &pdev->dev, 4,
+				 mpc8xxx_gc->regs + GPIO_DAT,
+				 NULL, NULL,
+				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
+				 BGPIOF_BIG_ENDIAN
+				 | BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+		if (ret)
+			goto err;
+		dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
+	}
+
+	mpc8xxx_gc->direction_output = gc->direction_output;
+
+	if (!devtype)
+		devtype = &mpc8xxx_gpio_devtype_default;
+
+	/*
+	 * It's assumed that only a single type of gpio controller is available
+	 * on the current machine, so overwriting global data is fine.
+	 */
+	if (devtype->irq_set_type)
+		mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type;
+
+	if (devtype->gpio_dir_out)
+		gc->direction_output = devtype->gpio_dir_out;
+	if (devtype->gpio_get)
+		gc->get = devtype->gpio_get;
+
+	gc->to_irq = mpc8xxx_gpio_to_irq;
+
+	/*
+	 * The GPIO Input Buffer Enable register(GPIO_IBE) is used to control
+	 * the input enable of each individual GPIO port.  When an individual
+	 * GPIO port’s direction is set to input (GPIO_GPDIR[DRn=0]), the
+	 * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
+	 * the port value to the GPIO Data Register.
+	 */
+	if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
+	    of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
+	    of_device_is_compatible(np, "fsl,ls1088a-gpio"))
+		gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
+
+	ret = devm_gpiochip_add_data(&pdev->dev, gc, mpc8xxx_gc);
+	if (ret) {
+		pr_err("%pOF: GPIO chip registration failed with status %d\n",
+		       np, ret);
+		goto err;
+	}
+
+	mpc8xxx_gc->irqn = irq_of_parse_and_map(np, 0);
+	if (!mpc8xxx_gc->irqn)
+		return 0;
+
+	mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
+					&mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
+	if (!mpc8xxx_gc->irq)
+		return 0;
+
+	/* ack and mask all irqs */
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
+	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
+
+	ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
+			       mpc8xxx_gpio_irq_cascade,
+			       IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade",
+			       mpc8xxx_gc);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: failed to devm_request_irq(%d), ret = %d\n",
+			np->full_name, mpc8xxx_gc->irqn, ret);
+		goto err;
+	}
+
+	return 0;
+err:
+	if (mpc8xxx_gc->irq)
+		irq_domain_remove(mpc8xxx_gc->irq);
+	iounmap(mpc8xxx_gc->regs);
+	return ret;
+}
+
+static int mpc8xxx_remove(struct platform_device *pdev)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
+
+	if (mpc8xxx_gc->irq) {
+		irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
+		irq_domain_remove(mpc8xxx_gc->irq);
+	}
+
+	iounmap(mpc8xxx_gc->regs);
+
+	return 0;
+}
+
+static struct platform_driver mpc8xxx_plat_driver = {
+	.probe		= mpc8xxx_probe,
+	.remove		= mpc8xxx_remove,
+	.driver		= {
+		.name = "gpio-mpc8xxx",
+		.of_match_table	= mpc8xxx_gpio_ids,
+	},
+};
+
+static int __init mpc8xxx_init(void)
+{
+	return platform_driver_register(&mpc8xxx_plat_driver);
+}
+
+arch_initcall(mpc8xxx_init);