[PATCH v12 2/2] gpio: loongson: add gpio driver support
From: Yinbo Zhu
Date: Thu Mar 02 2023 - 03:17:30 EST
The Loongson platforms GPIO controller contains 60 GPIO pins in total,
4 of which are dedicated GPIO pins, and the remaining 56 are reused
with other functions. Each GPIO can set input/output and has the
interrupt capability.
This driver added support for Loongson GPIO controller and support to
use DTS or ACPI to descibe GPIO device resources.
Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
Signed-off-by: Hongchen Zhang <zhanghongchen@xxxxxxxxxxx>
Signed-off-by: Liu Peibao <liupeibao@xxxxxxxxxxx>
Signed-off-by: Juxin Gao <gaojuxin@xxxxxxxxxxx>
Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
Change in v12:
1. Fixup the bgpio_int that use error input args.
2. The loongson-2 GPIO controller no interrupt status register so
remove the gpio domain code logic.
3. Fixup the of_device_id data element.
4. Fixup the copyright time.
Change in v11:
1. Place this patch behind the binding patch.
2. Add select IRQ_DOMAIN_HIERARCHY.
3. Add select OF_GPIO.
4. Remove the acpi.h.
5. Used to_platform_device to gain pdev.
6. Used macros replace that get_direction() returned values.
7. Fixup the parent irq number.
8. Remove some ugly lgpio macros definition.
9. Fixup the broken indentation.
10. Fixup the bgpio_int inappropriate parameters that use 'NULL'
replace '0'
Change in v10:
1. Used unsigned int to replace int in loongson_gpio_chip_data for
offset.
2. Used chip_data replace p_data.
3. Save a line by initializing the variable when declaring it.
4. Add a static inline to_loongson_gpio_chip() helper that wraps the
container_of() expansion and only needs a single argument.
5. Return devm_gpiochip_add_data directly in loongson_gpio_init.
6. Drop __maybe_unused in loongson_gpio_init.
Change in v9:
1. Fixup the xxx_device_id data field naming method.
2. Remove the "offset >= chip->ngpio" judgement in loongson_gpio_to_irq.
Change in v8:
1. Return the loongson_gpio_init function directly in probe.
Change in v7:
1. Add the gpio irqchip support.
2. Replace __set_direction with loongson_commit_direction.
3. Replace __set_level with loongson_commit_level.
4. Remove the parser of gsi_idx_map.
5. Add the support_irq flag.
6. Replace string platform_data with chip_data.
7. Remove the loongson_gpio_request.
Change in v6:
1. Remove the bit mode keep byte mode in all function except
loongson_gpio_init.
2. Use bgpio_init replace bit mode.
3. Implement the function loongson_gpio_get_direction for byte mode.
4. Set ngpios after call bgpio_init.
5. Use gpio-loongson-64bit.c as driver filename.
6. Ignore that loongson legacy drvier and remove the patch about
"gpio: loongson2ef: move driver to original location".
Change in v5:
1. Move legacy gpio driver to proper location.
2. Remove the "gpio_base".
3. Add of_device_id and acpi_device_id data field for platform
data.
4. Remove the ACPI_PTR().
5. Remove the gpio label judgement logic and use mode instead.
6. Drop platform_loongson_gpio_get_props.
7. Using devres for all resource.
8. Remove the loongson_gpio_remove.
9. Remove the unmatched print information.
10. Remove the loongson_gpio_exit.
Change in v4:
1. Fixup name spelling about Signed-off-by.
2. Drop "series" here and everywhere else.
3. Fixup the copyright in driver.
4. Drop the "else" in loongson_gpio_request.
5. Use trinocular operation replace the related logic.
6. Remove lable judgement in context about "lgpio->chip.to_irq =
loongson_gpio_to_irq"
7. Use dev_err replace pr_err in probe.
8. Make legacy platform_data should be left out of this patch.
9. Remove the mips config in gpio Kconfig.
Change in v3:
1. Move the gpio platform data struct from arch/ into include/linux/
platform_data/.
2. Replace platform_gpio_data with loongson_gpio_platform_data in .c.
3. Add maintainer in MAINTAINERS file for include/linux/platform_data/
gpio-loongson.h and gpio-loongson.c
Change in v2:
1. Fixup of_loongson_gpio_get_props and remove the parse logic about
"loongson,conf_offset", "loongson,out_offset", "loongson,in_offset",
"loongson,gpio_base", "loongson,support_irq" then kernel driver will
initial them that depend compatible except "loongson,gpio_base".
MAINTAINERS | 1 +
drivers/gpio/Kconfig | 12 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-loongson-64bit.c | 239 +++++++++++++++++++++++++++++
4 files changed, 253 insertions(+)
create mode 100644 drivers/gpio/gpio-loongson-64bit.c
diff --git a/MAINTAINERS b/MAINTAINERS
index b54b36187e75..caac8a3bd815 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12091,6 +12091,7 @@ M: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
L: linux-gpio@xxxxxxxxxxxxxxx
S: Maintained
F: Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
+F: drivers/gpio/gpio-loongson-64bit.c
LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
M: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 218d7e4c27ff..f86a9c134e6b 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -380,6 +380,18 @@ 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 OF_GPIO
+ select GPIO_GENERIC
+ 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
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index c048ba003367..73d1ec260c14 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -80,6 +80,7 @@ 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
diff --git a/drivers/gpio/gpio-loongson-64bit.c b/drivers/gpio/gpio-loongson-64bit.c
new file mode 100644
index 000000000000..20a68e5e66c1
--- /dev/null
+++ b/drivers/gpio/gpio-loongson-64bit.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Loongson GPIO Support
+ *
+ * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ */
+
+#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 <asm/types.h>
+
+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;
+};
+
+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, lgpio->reg_base + lgpio->chip_data->conf_offset + pin);
+}
+
+static void loongson_commit_level(struct loongson_gpio_chip *lgpio, unsigned int pin, int high)
+{
+ u8 bval = high ? 1 : 0;
+
+ writeb(bval, lgpio->reg_base + lgpio->chip_data->out_offset + 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(lgpio->reg_base + lgpio->chip_data->in_offset + pin);
+ val = bval & 1;
+
+ return val;
+}
+
+static int loongson_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
+{
+ u8 bval;
+ struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);
+
+ bval = readb(lgpio->reg_base + lgpio->chip_data->conf_offset + pin);
+ if (bval & 1)
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+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 = to_platform_device(chip->parent);
+
+ return platform_get_irq(pdev, offset);
+}
+
+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;
+
+ lgpio->reg_base = reg_base;
+
+ if (lgpio->chip_data->mode == BIT_CTRL_MODE) {
+ ret = bgpio_init(&lgpio->chip, dev, 8,
+ lgpio->reg_base + lgpio->chip_data->in_offset,
+ lgpio->reg_base + lgpio->chip_data->out_offset,
+ NULL, NULL,
+ lgpio->reg_base + lgpio->chip_data->conf_offset,
+ 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.parent = dev;
+ spin_lock_init(&lgpio->lock);
+ }
+
+ device_property_read_u32(dev, "ngpios", &ngpios);
+
+ lgpio->chip.can_sleep = 0;
+ lgpio->chip.ngpio = ngpios;
+ lgpio->chip.label = lgpio->chip_data->label;
+ lgpio->chip.to_irq = loongson_gpio_to_irq;
+
+ 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 = 0x20,
+ .out_offset = 0x10,
+};
+
+static const struct loongson_gpio_chip_data loongson_gpio_ls7a_data = {
+ .label = "ls7a_gpio",
+ .mode = BYTE_CTRL_MODE,
+ .conf_offset = 0x800,
+ .in_offset = 0xa00,
+ .out_offset = 0x900,
+};
+
+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");
--
2.31.1