@@ -12165,6 +12165,12 @@ S: Maintained
F: Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
F: drivers/pinctrl/pinctrl-loongson2.c
+LOONGSON GPIO DRIVER
+M: Yinbo Zhu <zhuyinbo@loongson.cn>
+L: linux-gpio@vger.kernel.org
+S: Maintained
+F: drivers/gpio/gpio-loongson-64bit.c
+
LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
M: Sathya Prakash <sathya.prakash@broadcom.com>
M: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
@@ -390,6 +390,18 @@ config GPIO_LOONGSON
help
Driver for GPIO functionality on Loongson-2F/3A/3B processors.
+config GPIO_LOONGSON_64BIT
+ tristate "Loongson 64 bit GPIO support"
+ depends on LOONGARCH || COMPILE_TEST
+ select GPIO_GENERIC
+ select GPIOLIB_IRQCHIP
+ help
+ Say yes here to support the GPIO functionality of a number of
+ Loongson series of chips. The Loongson GPIO controller supports
+ up to 60 GPIOS in total, 4 of which are dedicated GPIO pins, and
+ the remaining 56 are reused with other functions, with edge or
+ level triggered interrupts.
+
config GPIO_LPC18XX
tristate "NXP LPC18XX/43XX GPIO support"
default y if ARCH_LPC18XX
@@ -81,6 +81,7 @@ obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o
obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o
obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o
obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o
+obj-$(CONFIG_GPIO_LOONGSON_64BIT) += gpio-loongson-64bit.o
obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o
obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o
new file mode 100644
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Loongson GPIO Support
+ *
+ * Copyright (C) 2022 Loongson Technology Corporation Limited
+ */
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+#include <linux/bitops.h>
+#include <linux/of_irq.h>
+#include <asm/types.h>
+
+#define LOONGSON_GPIO_IN(x) (x->reg_base +\
+ x->chip_data->in_offset)
+#define LOONGSON_GPIO_OUT(x) (x->reg_base +\
+ x->chip_data->out_offset)
+#define LOONGSON_GPIO_OEN(x) (x->reg_base +\
+ x->chip_data->conf_offset)
+#define LOONGSON_GPIO_IN_BYTE(x, gpio) (x->reg_base +\
+ x->chip_data->in_offset + gpio)
+#define LOONGSON_GPIO_OUT_BYTE(x, gpio) (x->reg_base +\
+ x->chip_data->out_offset + gpio)
+#define LOONGSON_GPIO_OEN_BYTE(x, gpio) (x->reg_base +\
+ x->chip_data->conf_offset + gpio)
+
+enum loongson_gpio_mode {
+ BIT_CTRL_MODE,
+ BYTE_CTRL_MODE,
+};
+
+struct loongson_gpio_chip_data {
+ const char *label;
+ enum loongson_gpio_mode mode;
+ unsigned int conf_offset;
+ unsigned int out_offset;
+ unsigned int in_offset;
+ bool support_irq;
+};
+
+struct loongson_gpio_chip {
+ struct gpio_chip chip;
+ struct fwnode_handle *fwnode;
+ spinlock_t lock;
+ void __iomem *reg_base;
+ const struct loongson_gpio_chip_data *chip_data;
+};
+
+static inline struct loongson_gpio_chip *to_loongson_gpio_chip(
+ struct gpio_chip *chip)
+{
+ return container_of(chip, struct loongson_gpio_chip, chip);
+}
+
+static inline void loongson_commit_direction(
+ struct loongson_gpio_chip *lgpio,
+ unsigned int pin, int input)
+{
+ u8 bval = input ? 1 : 0;
+
+ writeb(bval, LOONGSON_GPIO_OEN_BYTE(lgpio, pin));
+}
+
+static void loongson_commit_level(struct loongson_gpio_chip *lgpio,
+ unsigned int pin, int high)
+{
+ u8 bval = high ? 1 : 0;
+
+ writeb(bval, LOONGSON_GPIO_OUT_BYTE(lgpio, pin));
+}
+
+static int loongson_gpio_direction_input(
+ struct gpio_chip *chip, unsigned int pin)
+{
+ unsigned long flags;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ spin_lock_irqsave(&lgpio->lock, flags);
+ loongson_commit_direction(lgpio, pin, 1);
+ spin_unlock_irqrestore(&lgpio->lock, flags);
+
+ return 0;
+}
+
+static int loongson_gpio_direction_output(
+ struct gpio_chip *chip, unsigned int pin,
+ int value)
+{
+ unsigned long flags;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ spin_lock_irqsave(&lgpio->lock, flags);
+ loongson_commit_level(lgpio, pin, value);
+ loongson_commit_direction(lgpio, pin, 0);
+ spin_unlock_irqrestore(&lgpio->lock, flags);
+
+ return 0;
+}
+
+static int loongson_gpio_get(struct gpio_chip *chip, unsigned int pin)
+{
+ u8 bval;
+ int val;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ bval = readb(LOONGSON_GPIO_IN_BYTE(lgpio, pin));
+ val = bval & 1;
+
+ return val;
+}
+
+static int loongson_gpio_get_direction(
+ struct gpio_chip *chip, unsigned int pin)
+{
+ u8 bval;
+ int val;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ bval = readb(LOONGSON_GPIO_OEN_BYTE(lgpio, pin));
+ val = bval & 1;
+
+ return val;
+}
+
+static void loongson_gpio_set(struct gpio_chip *chip, unsigned int pin,
+ int value)
+{
+ unsigned long flags;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ spin_lock_irqsave(&lgpio->lock, flags);
+ loongson_commit_level(lgpio, pin, value);
+ spin_unlock_irqrestore(&lgpio->lock, flags);
+}
+
+static int loongson_gpio_to_irq(
+ struct gpio_chip *chip, unsigned int offset)
+{
+ struct platform_device *pdev =
+ container_of(chip->parent, struct platform_device, dev);
+
+ return platform_get_irq(pdev, offset);
+}
+
+static void loongson_gpio_irq_ack(struct irq_data *d)
+{
+ irq_chip_ack_parent(d);
+}
+
+static void loongson_gpio_mask_irq(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+ irq_chip_mask_parent(d);
+ gpiochip_disable_irq(gc, d->hwirq);
+}
+
+static void loongson_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+ gpiochip_enable_irq(gc, d->hwirq);
+ irq_chip_unmask_parent(d);
+}
+
+static int loongson_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ irq_set_handler_locked(d, handle_edge_irq);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_set_handler_locked(d, handle_edge_irq);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ irq_set_handler_locked(d, handle_level_irq);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_set_handler_locked(d, handle_level_irq);
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ irq_set_handler_locked(d, handle_edge_irq);
+ break;
+ case IRQ_TYPE_NONE:
+ default:
+ return -EINVAL;
+ }
+
+ return irq_chip_set_type_parent(d, type);
+}
+
+static const struct irq_chip loongson_gpio_irqchip = {
+ .name = "loongson-gpio-irqchip",
+ .irq_ack = loongson_gpio_irq_ack,
+ .irq_mask = loongson_gpio_mask_irq,
+ .irq_unmask = loongson_gpio_irq_unmask,
+ .irq_set_type = loongson_gpio_irq_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static int loongson_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
+ unsigned int child,
+ unsigned int child_type,
+ unsigned int *parent,
+ unsigned int *parent_type)
+{
+ *parent_type = child_type;
+
+ /* GPIO lines 0..3 have dedicated IRQs */
+ if (child >= 0 && child <= 3) {
+ *parent = child + 60;
+ return 0;
+ }
+
+ if (child >= 4 && child <= 31) {
+ *parent = 58;
+ return 0;
+ }
+
+ if (child >= 32 && child <= 63) {
+ *parent = 59;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int loongson_gpio_init(
+ struct device *dev, struct loongson_gpio_chip *lgpio,
+ struct device_node *np, void __iomem *reg_base)
+{
+ int ret;
+ u32 ngpios;
+ struct irq_domain *parent;
+ struct gpio_irq_chip *girq;
+ struct device_node *irq_parent;
+
+ lgpio->reg_base = reg_base;
+
+ if (lgpio->chip_data->mode == BIT_CTRL_MODE) {
+ ret = bgpio_init(&lgpio->chip, dev, 8,
+ LOONGSON_GPIO_IN(lgpio),
+ LOONGSON_GPIO_OUT(lgpio), 0,
+ LOONGSON_GPIO_OEN(lgpio), NULL, 0);
+ if (ret) {
+ dev_err(dev, "unable to init generic GPIO\n");
+ return ret;
+ }
+ } else {
+ lgpio->chip.direction_input = loongson_gpio_direction_input;
+ lgpio->chip.get = loongson_gpio_get;
+ lgpio->chip.get_direction = loongson_gpio_get_direction;
+ lgpio->chip.direction_output = loongson_gpio_direction_output;
+ lgpio->chip.set = loongson_gpio_set;
+ lgpio->chip.can_sleep = 0;
+ lgpio->chip.of_node = np;
+ lgpio->chip.parent = dev;
+ spin_lock_init(&lgpio->lock);
+ }
+
+ device_property_read_u32(dev, "ngpios", &ngpios);
+
+ lgpio->chip.ngpio = ngpios;
+ lgpio->chip.label = lgpio->chip_data->label;
+
+ if (lgpio->chip_data->support_irq == true) {
+ lgpio->chip.to_irq = loongson_gpio_to_irq;
+ irq_parent = of_irq_find_parent(np);
+ if (irq_parent)
+ parent = irq_find_host(irq_parent);
+
+ lgpio->fwnode = of_node_to_fwnode(np);
+
+ girq = &lgpio->chip.irq;
+ gpio_irq_chip_set_chip(girq, &loongson_gpio_irqchip);
+ girq->fwnode = lgpio->fwnode;
+ girq->parent_domain = parent;
+ girq->child_to_parent_hwirq = loongson_gpio_child_to_parent_hwirq;
+ girq->handler = handle_bad_irq;
+ girq->default_type = IRQ_TYPE_NONE;
+ }
+
+ return devm_gpiochip_add_data(dev, &lgpio->chip, lgpio);
+}
+
+static int loongson_gpio_probe(struct platform_device *pdev)
+{
+ void __iomem *reg_base;
+ struct loongson_gpio_chip *lgpio;
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+
+ lgpio = devm_kzalloc(dev, sizeof(*lgpio), GFP_KERNEL);
+ if (!lgpio)
+ return -ENOMEM;
+
+ lgpio->chip_data = device_get_match_data(dev);
+
+ reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(reg_base))
+ return PTR_ERR(reg_base);
+
+ return loongson_gpio_init(dev, lgpio, np, reg_base);
+}
+
+static const struct loongson_gpio_chip_data loongson_gpio_ls2k_data = {
+ .label = "ls2k_gpio",
+ .mode = BIT_CTRL_MODE,
+ .conf_offset = 0x0,
+ .in_offset = 0x10,
+ .out_offset = 0x20,
+ .support_irq = true,
+};
+
+static const struct loongson_gpio_chip_data loongson_gpio_ls7a_data = {
+ .label = "ls7a_gpio",
+ .mode = BYTE_CTRL_MODE,
+ .conf_offset = 0x800,
+ .in_offset = 0x900,
+ .out_offset = 0xa00,
+ .support_irq = false,
+};
+
+static const struct of_device_id loongson_gpio_of_match[] = {
+ {
+ .compatible = "loongson,ls2k-gpio",
+ .data = &loongson_gpio_ls2k_data,
+ },
+ {
+ .compatible = "loongson,ls7a-gpio",
+ .data = &loongson_gpio_ls7a_data,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, loongson_gpio_of_match);
+
+static const struct acpi_device_id loongson_gpio_acpi_match[] = {
+ {
+ .id = "LOON0002",
+ .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a_data,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match);
+
+static struct platform_driver loongson_gpio_driver = {
+ .driver = {
+ .name = "loongson-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = loongson_gpio_of_match,
+ .acpi_match_table = loongson_gpio_acpi_match,
+ },
+ .probe = loongson_gpio_probe,
+};
+
+static int __init loongson_gpio_setup(void)
+{
+ return platform_driver_register(&loongson_gpio_driver);
+}
+postcore_initcall(loongson_gpio_setup);
+
+MODULE_DESCRIPTION("Loongson gpio driver");
+MODULE_LICENSE("GPL");