Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 147 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/simple_gpio.c b/arch/powerpc/sysdev/simple_gpio.c
new file mode 100644
index 000000000..f02d45761
--- /dev/null
+++ b/arch/powerpc/sysdev/simple_gpio.c
@@ -0,0 +1,147 @@
+/*
+ * Simple Memory-Mapped GPIOs
+ *
+ * Copyright (c) MontaVista Software, Inc. 2008.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio/driver.h>
+#include <linux/slab.h>
+#include <asm/prom.h>
+#include "simple_gpio.h"
+
+struct u8_gpio_chip {
+	struct of_mm_gpio_chip mm_gc;
+	spinlock_t lock;
+
+	/* shadowed data register to clear/set bits safely */
+	u8 data;
+};
+
+static u8 u8_pin2mask(unsigned int pin)
+{
+	return 1 << (8 - 1 - pin);
+}
+
+static int u8_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+
+	return !!(in_8(mm_gc->regs) & u8_pin2mask(gpio));
+}
+
+static void u8_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+	struct u8_gpio_chip *u8_gc = gpiochip_get_data(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&u8_gc->lock, flags);
+
+	if (val)
+		u8_gc->data |= u8_pin2mask(gpio);
+	else
+		u8_gc->data &= ~u8_pin2mask(gpio);
+
+	out_8(mm_gc->regs, u8_gc->data);
+
+	spin_unlock_irqrestore(&u8_gc->lock, flags);
+}
+
+static int u8_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+	return 0;
+}
+
+static int u8_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+	u8_gpio_set(gc, gpio, val);
+	return 0;
+}
+
+static void u8_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
+{
+	struct u8_gpio_chip *u8_gc =
+		container_of(mm_gc, struct u8_gpio_chip, mm_gc);
+
+	u8_gc->data = in_8(mm_gc->regs);
+}
+
+static int __init u8_simple_gpiochip_add(struct device_node *np)
+{
+	int ret;
+	struct u8_gpio_chip *u8_gc;
+	struct of_mm_gpio_chip *mm_gc;
+	struct gpio_chip *gc;
+
+	u8_gc = kzalloc(sizeof(*u8_gc), GFP_KERNEL);
+	if (!u8_gc)
+		return -ENOMEM;
+
+	spin_lock_init(&u8_gc->lock);
+
+	mm_gc = &u8_gc->mm_gc;
+	gc = &mm_gc->gc;
+
+	mm_gc->save_regs = u8_gpio_save_regs;
+	gc->ngpio = 8;
+	gc->direction_input = u8_gpio_dir_in;
+	gc->direction_output = u8_gpio_dir_out;
+	gc->get = u8_gpio_get;
+	gc->set = u8_gpio_set;
+
+	ret = of_mm_gpiochip_add_data(np, mm_gc, u8_gc);
+	if (ret)
+		goto err;
+	return 0;
+err:
+	kfree(u8_gc);
+	return ret;
+}
+
+void __init simple_gpiochip_init(const char *compatible)
+{
+	struct device_node *np;
+
+	for_each_compatible_node(np, NULL, compatible) {
+		int ret;
+		struct resource r;
+
+		ret = of_address_to_resource(np, 0, &r);
+		if (ret)
+			goto err;
+
+		switch (resource_size(&r)) {
+		case 1:
+			ret = u8_simple_gpiochip_add(np);
+			if (ret)
+				goto err;
+			break;
+		default:
+			/*
+			 * Whenever you need support for GPIO bank width > 1,
+			 * please just turn u8_ code into huge macros, and
+			 * construct needed uX_ code with it.
+			 */
+			ret = -ENOSYS;
+			goto err;
+		}
+		continue;
+err:
+		pr_err("%pOF: registration failed, status %d\n", np, ret);
+	}
+}