Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 430 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
new file mode 100644
index 000000000..dc42571e6
--- /dev/null
+++ b/drivers/gpio/gpio-pl061.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright (C) 2008, 2009 Provigent Ltd.
+ *
+ * Author: Baruch Siach <baruch@tkos.co.il>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
+ *
+ * Data sheet: ARM DDI 0190B, September 2000
+ */
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/slab.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm.h>
+
+#define GPIODIR 0x400
+#define GPIOIS  0x404
+#define GPIOIBE 0x408
+#define GPIOIEV 0x40C
+#define GPIOIE  0x410
+#define GPIORIS 0x414
+#define GPIOMIS 0x418
+#define GPIOIC  0x41C
+
+#define PL061_GPIO_NR	8
+
+#ifdef CONFIG_PM
+struct pl061_context_save_regs {
+	u8 gpio_data;
+	u8 gpio_dir;
+	u8 gpio_is;
+	u8 gpio_ibe;
+	u8 gpio_iev;
+	u8 gpio_ie;
+};
+#endif
+
+struct pl061 {
+	raw_spinlock_t		lock;
+
+	void __iomem		*base;
+	struct gpio_chip	gc;
+	struct irq_chip		irq_chip;
+	int			parent_irq;
+
+#ifdef CONFIG_PM
+	struct pl061_context_save_regs csave_regs;
+#endif
+};
+
+static int pl061_get_direction(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+
+	return !(readb(pl061->base + GPIODIR) & BIT(offset));
+}
+
+static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	unsigned long flags;
+	unsigned char gpiodir;
+
+	raw_spin_lock_irqsave(&pl061->lock, flags);
+	gpiodir = readb(pl061->base + GPIODIR);
+	gpiodir &= ~(BIT(offset));
+	writeb(gpiodir, pl061->base + GPIODIR);
+	raw_spin_unlock_irqrestore(&pl061->lock, flags);
+
+	return 0;
+}
+
+static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
+		int value)
+{
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	unsigned long flags;
+	unsigned char gpiodir;
+
+	raw_spin_lock_irqsave(&pl061->lock, flags);
+	writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+	gpiodir = readb(pl061->base + GPIODIR);
+	gpiodir |= BIT(offset);
+	writeb(gpiodir, pl061->base + GPIODIR);
+
+	/*
+	 * gpio value is set again, because pl061 doesn't allow to set value of
+	 * a gpio pin before configuring it in OUT mode.
+	 */
+	writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+	raw_spin_unlock_irqrestore(&pl061->lock, flags);
+
+	return 0;
+}
+
+static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+
+	return !!readb(pl061->base + (BIT(offset + 2)));
+}
+
+static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
+{
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+
+	writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+}
+
+static int pl061_irq_type(struct irq_data *d, unsigned trigger)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	int offset = irqd_to_hwirq(d);
+	unsigned long flags;
+	u8 gpiois, gpioibe, gpioiev;
+	u8 bit = BIT(offset);
+
+	if (offset < 0 || offset >= PL061_GPIO_NR)
+		return -EINVAL;
+
+	if ((trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) &&
+	    (trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)))
+	{
+		dev_err(gc->parent,
+			"trying to configure line %d for both level and edge "
+			"detection, choose one!\n",
+			offset);
+		return -EINVAL;
+	}
+
+
+	raw_spin_lock_irqsave(&pl061->lock, flags);
+
+	gpioiev = readb(pl061->base + GPIOIEV);
+	gpiois = readb(pl061->base + GPIOIS);
+	gpioibe = readb(pl061->base + GPIOIBE);
+
+	if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+		bool polarity = trigger & IRQ_TYPE_LEVEL_HIGH;
+
+		/* Disable edge detection */
+		gpioibe &= ~bit;
+		/* Enable level detection */
+		gpiois |= bit;
+		/* Select polarity */
+		if (polarity)
+			gpioiev |= bit;
+		else
+			gpioiev &= ~bit;
+		irq_set_handler_locked(d, handle_level_irq);
+		dev_dbg(gc->parent, "line %d: IRQ on %s level\n",
+			offset,
+			polarity ? "HIGH" : "LOW");
+	} else if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
+		/* Disable level detection */
+		gpiois &= ~bit;
+		/* Select both edges, setting this makes GPIOEV be ignored */
+		gpioibe |= bit;
+		irq_set_handler_locked(d, handle_edge_irq);
+		dev_dbg(gc->parent, "line %d: IRQ on both edges\n", offset);
+	} else if ((trigger & IRQ_TYPE_EDGE_RISING) ||
+		   (trigger & IRQ_TYPE_EDGE_FALLING)) {
+		bool rising = trigger & IRQ_TYPE_EDGE_RISING;
+
+		/* Disable level detection */
+		gpiois &= ~bit;
+		/* Clear detection on both edges */
+		gpioibe &= ~bit;
+		/* Select edge */
+		if (rising)
+			gpioiev |= bit;
+		else
+			gpioiev &= ~bit;
+		irq_set_handler_locked(d, handle_edge_irq);
+		dev_dbg(gc->parent, "line %d: IRQ on %s edge\n",
+			offset,
+			rising ? "RISING" : "FALLING");
+	} else {
+		/* No trigger: disable everything */
+		gpiois &= ~bit;
+		gpioibe &= ~bit;
+		gpioiev &= ~bit;
+		irq_set_handler_locked(d, handle_bad_irq);
+		dev_warn(gc->parent, "no trigger selected for line %d\n",
+			 offset);
+	}
+
+	writeb(gpiois, pl061->base + GPIOIS);
+	writeb(gpioibe, pl061->base + GPIOIBE);
+	writeb(gpioiev, pl061->base + GPIOIEV);
+
+	raw_spin_unlock_irqrestore(&pl061->lock, flags);
+
+	return 0;
+}
+
+static void pl061_irq_handler(struct irq_desc *desc)
+{
+	unsigned long pending;
+	int offset;
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	struct irq_chip *irqchip = irq_desc_get_chip(desc);
+
+	chained_irq_enter(irqchip, desc);
+
+	pending = readb(pl061->base + GPIOMIS);
+	if (pending) {
+		for_each_set_bit(offset, &pending, PL061_GPIO_NR)
+			generic_handle_irq(irq_find_mapping(gc->irq.domain,
+							    offset));
+	}
+
+	chained_irq_exit(irqchip, desc);
+}
+
+static void pl061_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
+	u8 gpioie;
+
+	raw_spin_lock(&pl061->lock);
+	gpioie = readb(pl061->base + GPIOIE) & ~mask;
+	writeb(gpioie, pl061->base + GPIOIE);
+	raw_spin_unlock(&pl061->lock);
+}
+
+static void pl061_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
+	u8 gpioie;
+
+	raw_spin_lock(&pl061->lock);
+	gpioie = readb(pl061->base + GPIOIE) | mask;
+	writeb(gpioie, pl061->base + GPIOIE);
+	raw_spin_unlock(&pl061->lock);
+}
+
+/**
+ * pl061_irq_ack() - ACK an edge IRQ
+ * @d: IRQ data for this IRQ
+ *
+ * This gets called from the edge IRQ handler to ACK the edge IRQ
+ * in the GPIOIC (interrupt-clear) register. For level IRQs this is
+ * not needed: these go away when the level signal goes away.
+ */
+static void pl061_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+	u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
+
+	raw_spin_lock(&pl061->lock);
+	writeb(mask, pl061->base + GPIOIC);
+	raw_spin_unlock(&pl061->lock);
+}
+
+static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct pl061 *pl061 = gpiochip_get_data(gc);
+
+	return irq_set_irq_wake(pl061->parent_irq, state);
+}
+
+static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
+{
+	struct device *dev = &adev->dev;
+	struct pl061 *pl061;
+	int ret, irq;
+
+	pl061 = devm_kzalloc(dev, sizeof(*pl061), GFP_KERNEL);
+	if (pl061 == NULL)
+		return -ENOMEM;
+
+	pl061->base = devm_ioremap_resource(dev, &adev->res);
+	if (IS_ERR(pl061->base))
+		return PTR_ERR(pl061->base);
+
+	raw_spin_lock_init(&pl061->lock);
+	if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
+		pl061->gc.request = gpiochip_generic_request;
+		pl061->gc.free = gpiochip_generic_free;
+	}
+
+	pl061->gc.base = -1;
+	pl061->gc.get_direction = pl061_get_direction;
+	pl061->gc.direction_input = pl061_direction_input;
+	pl061->gc.direction_output = pl061_direction_output;
+	pl061->gc.get = pl061_get_value;
+	pl061->gc.set = pl061_set_value;
+	pl061->gc.ngpio = PL061_GPIO_NR;
+	pl061->gc.label = dev_name(dev);
+	pl061->gc.parent = dev;
+	pl061->gc.owner = THIS_MODULE;
+
+	ret = gpiochip_add_data(&pl061->gc, pl061);
+	if (ret)
+		return ret;
+
+	/*
+	 * irq_chip support
+	 */
+	pl061->irq_chip.name = dev_name(dev);
+	pl061->irq_chip.irq_ack	= pl061_irq_ack;
+	pl061->irq_chip.irq_mask = pl061_irq_mask;
+	pl061->irq_chip.irq_unmask = pl061_irq_unmask;
+	pl061->irq_chip.irq_set_type = pl061_irq_type;
+	pl061->irq_chip.irq_set_wake = pl061_irq_set_wake;
+
+	writeb(0, pl061->base + GPIOIE); /* disable irqs */
+	irq = adev->irq[0];
+	if (irq < 0) {
+		dev_err(&adev->dev, "invalid IRQ\n");
+		return -ENODEV;
+	}
+	pl061->parent_irq = irq;
+
+	ret = gpiochip_irqchip_add(&pl061->gc, &pl061->irq_chip,
+				   0, handle_bad_irq,
+				   IRQ_TYPE_NONE);
+	if (ret) {
+		dev_info(&adev->dev, "could not add irqchip\n");
+		return ret;
+	}
+	gpiochip_set_chained_irqchip(&pl061->gc, &pl061->irq_chip,
+				     irq, pl061_irq_handler);
+
+	amba_set_drvdata(adev, pl061);
+	dev_info(&adev->dev, "PL061 GPIO chip @%pa registered\n",
+		 &adev->res.start);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int pl061_suspend(struct device *dev)
+{
+	struct pl061 *pl061 = dev_get_drvdata(dev);
+	int offset;
+
+	pl061->csave_regs.gpio_data = 0;
+	pl061->csave_regs.gpio_dir = readb(pl061->base + GPIODIR);
+	pl061->csave_regs.gpio_is = readb(pl061->base + GPIOIS);
+	pl061->csave_regs.gpio_ibe = readb(pl061->base + GPIOIBE);
+	pl061->csave_regs.gpio_iev = readb(pl061->base + GPIOIEV);
+	pl061->csave_regs.gpio_ie = readb(pl061->base + GPIOIE);
+
+	for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+		if (pl061->csave_regs.gpio_dir & (BIT(offset)))
+			pl061->csave_regs.gpio_data |=
+				pl061_get_value(&pl061->gc, offset) << offset;
+	}
+
+	return 0;
+}
+
+static int pl061_resume(struct device *dev)
+{
+	struct pl061 *pl061 = dev_get_drvdata(dev);
+	int offset;
+
+	for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+		if (pl061->csave_regs.gpio_dir & (BIT(offset)))
+			pl061_direction_output(&pl061->gc, offset,
+					pl061->csave_regs.gpio_data &
+					(BIT(offset)));
+		else
+			pl061_direction_input(&pl061->gc, offset);
+	}
+
+	writeb(pl061->csave_regs.gpio_is, pl061->base + GPIOIS);
+	writeb(pl061->csave_regs.gpio_ibe, pl061->base + GPIOIBE);
+	writeb(pl061->csave_regs.gpio_iev, pl061->base + GPIOIEV);
+	writeb(pl061->csave_regs.gpio_ie, pl061->base + GPIOIE);
+
+	return 0;
+}
+
+static const struct dev_pm_ops pl061_dev_pm_ops = {
+	.suspend = pl061_suspend,
+	.resume = pl061_resume,
+	.freeze = pl061_suspend,
+	.restore = pl061_resume,
+};
+#endif
+
+static const struct amba_id pl061_ids[] = {
+	{
+		.id	= 0x00041061,
+		.mask	= 0x000fffff,
+	},
+	{ 0, 0 },
+};
+
+static struct amba_driver pl061_gpio_driver = {
+	.drv = {
+		.name	= "pl061_gpio",
+#ifdef CONFIG_PM
+		.pm	= &pl061_dev_pm_ops,
+#endif
+	},
+	.id_table	= pl061_ids,
+	.probe		= pl061_probe,
+};
+
+static int __init pl061_gpio_init(void)
+{
+	return amba_driver_register(&pl061_gpio_driver);
+}
+device_initcall(pl061_gpio_init);