LoongArch inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

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Signed-off-by: Juxin Gao gaojuxin@loongson.cn Signed-off-by: Ming Wang wangming01@loongson.cn --- drivers/gpio/Kconfig | 3 +- drivers/gpio/gpio-loongson.c | 414 ++++++++++++++++++++++++++++------- 2 files changed, 341 insertions(+), 76 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index f45c6a36551c..be0cf9c87cd6 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -377,7 +377,8 @@ config GPIO_LOGICVC

config GPIO_LOONGSON bool "Loongson-2/3 GPIO support" - depends on CPU_LOONGSON2EF || CPU_LOONGSON64 + depends on CPU_LOONGSON2EF || CPU_LOONGSON64 || LOONGARCH + default m help Driver for GPIO functionality on Loongson-2F/3A/3B processors.

diff --git a/drivers/gpio/gpio-loongson.c b/drivers/gpio/gpio-loongson.c index a42145873cc9..a3a3d647a043 100644 --- a/drivers/gpio/gpio-loongson.c +++ b/drivers/gpio/gpio-loongson.c @@ -1,13 +1,13 @@ -// SPDX-License-Identifier: GPL-2.0-or-later /* - * Loongson-2F/3A/3B GPIO Support + * Loongson-3A/3B/3C/7A GPIO Support * - * Copyright (c) 2008 Richard Liu, STMicroelectronics richard.liu@st.com - * Copyright (c) 2008-2010 Arnaud Patard apatard@mandriva.com - * Copyright (c) 2013 Hongbing Hu huhb@lemote.com - * Copyright (c) 2014 Huacai Chen chenhc@lemote.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/acpi.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> @@ -16,120 +16,384 @@ #include <linux/gpio/driver.h> #include <linux/platform_device.h> #include <linux/bitops.h> +#include <linux/property.h> #include <asm/types.h> -#include <loongson.h>

-#define STLS2F_N_GPIO 4 -#define STLS3A_N_GPIO 16 +/* ============== Data structrues =============== */

-#ifdef CONFIG_CPU_LOONGSON64 -#define LOONGSON_N_GPIO STLS3A_N_GPIO -#else -#define LOONGSON_N_GPIO STLS2F_N_GPIO -#endif +/* gpio data */ +struct platform_gpio_data { + u32 gpio_conf; + u32 gpio_out; + u32 gpio_in; + u32 in_start_bit; + u32 support_irq; + char *label; + int gpio_base; + int ngpio; +}; + +#define GPIO_IO_CONF(x) (x->base + x->conf_offset) +#define GPIO_OUT(x) (x->base + x->out_offset) +#define GPIO_IN(x) (x->base + x->in_offset) + +#define LS7A_GPIO_OEN_BYTE(x, gpio) (x->base + x->conf_offset + gpio) +#define LS7A_GPIO_OUT_BYTE(x, gpio) (x->base + x->out_offset + gpio) +#define LS7A_GPIO_IN_BYTE(x, gpio) (x->base + x->in_offset + gpio) + +struct loongson_gpio_chip { + struct gpio_chip chip; + spinlock_t lock; + void __iomem *base; + int conf_offset; + int out_offset; + int in_offset; + int in_start_bit; + u16 *gsi_idx_map; + u16 mapsize; + bool support_irq; +};

/* - * Offset into the register where we read lines, we write them from offset 0. - * This offset is the only thing that stand between us and using - * GPIO_GENERIC. + * GPIO primitives. */ -#define LOONGSON_GPIO_IN_OFFSET 16 +static int loongson_gpio_request(struct gpio_chip *chip, unsigned int pin) +{ + if (pin >= chip->ngpio) + return -EINVAL; + else + return 0; +} + +static inline void +__set_direction(struct loongson_gpio_chip *lgpio, unsigned int pin, int input) +{ + u64 temp; + u8 value;

-static DEFINE_SPINLOCK(gpio_lock); + if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") || + !strncmp(lgpio->chip.label, "LOON0007", 8)) { + temp = readq(GPIO_IO_CONF(lgpio)); + if (input) + temp |= 1ULL << pin; + else + temp &= ~(1ULL << pin); + writeq(temp, GPIO_IO_CONF(lgpio)); + return; + } + if (!strcmp(lgpio->chip.label, "loongson,ls7a-gpio") || + !strncmp(lgpio->chip.label, "LOON0002", 8)) { + if (input) + value = 1; + else + value = 0; + writeb(value, LS7A_GPIO_OEN_BYTE(lgpio, pin)); + return; + } +}

-static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +static void __set_level(struct loongson_gpio_chip *lgpio, unsigned int pin, int high) { - u32 val; + u64 temp; + u8 value;

- spin_lock(&gpio_lock); - val = LOONGSON_GPIODATA; - spin_unlock(&gpio_lock); + /* If GPIO controller is on 3A,then... */ + if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") || + !strncmp(lgpio->chip.label, "LOON0007", 8)) { + temp = readq(GPIO_OUT(lgpio)); + if (high) + temp |= 1ULL << pin; + else + temp &= ~(1ULL << pin); + writeq(temp, GPIO_OUT(lgpio)); + return; + }

- return !!(val & BIT(gpio + LOONGSON_GPIO_IN_OFFSET)); + if (!strcmp(lgpio->chip.label, "loongson,ls7a-gpio") || + !strncmp(lgpio->chip.label, "LOON0002", 8)) { + if (high) + value = 1; + else + value = 0; + writeb(value, LS7A_GPIO_OUT_BYTE(lgpio, pin)); + return; + } }

-static void loongson_gpio_set_value(struct gpio_chip *chip, - unsigned gpio, int value) +static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) { - u32 val; + unsigned long flags; + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip);

- spin_lock(&gpio_lock); - val = LOONGSON_GPIODATA; - if (value) - val |= BIT(gpio); - else - val &= ~BIT(gpio); - LOONGSON_GPIODATA = val; - spin_unlock(&gpio_lock); + spin_lock_irqsave(&lgpio->lock, flags); + __set_direction(lgpio, pin, 1); + spin_unlock_irqrestore(&lgpio->lock, flags); + + return 0; }

-static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +static int loongson_gpio_direction_output(struct gpio_chip *chip, + unsigned int pin, int value) { - u32 temp; + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + unsigned long flags;

- spin_lock(&gpio_lock); - temp = LOONGSON_GPIOIE; - temp |= BIT(gpio); - LOONGSON_GPIOIE = temp; - spin_unlock(&gpio_lock); + spin_lock_irqsave(&lgpio->lock, flags); + __set_level(lgpio, pin, value); + __set_direction(lgpio, pin, 0); + spin_unlock_irqrestore(&lgpio->lock, flags);

return 0; }

-static int loongson_gpio_direction_output(struct gpio_chip *chip, - unsigned gpio, int level) +static int loongson_gpio_get(struct gpio_chip *chip, unsigned int pin) { - u32 temp; + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + u64 temp; + u8 value; + + /* GPIO controller in 3A is different for 7A */ + if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") || + !strncmp(lgpio->chip.label, "LOON0007", 8)) { + temp = readq(GPIO_IN(lgpio)); + return ((temp & (1ULL << (pin + lgpio->in_start_bit))) != 0); + } + + if (!strcmp(lgpio->chip.label, "loongson,ls7a-gpio") || + !strncmp(lgpio->chip.label, "LOON0002", 8)) { + value = readb(LS7A_GPIO_IN_BYTE(lgpio, pin)); + return (value & 1); + } + + return -ENXIO; +} + +static void loongson_gpio_set(struct gpio_chip *chip, unsigned int pin, int value) +{ + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + unsigned long flags; + + spin_lock_irqsave(&lgpio->lock, flags); + __set_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); + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + + if (offset >= chip->ngpio) + return -EINVAL; + + if ((lgpio->gsi_idx_map != NULL) && (offset < lgpio->mapsize)) + offset = lgpio->gsi_idx_map[offset]; + + 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 *base) +{ + lgpio->chip.request = loongson_gpio_request; + lgpio->chip.direction_input = loongson_gpio_direction_input; + lgpio->chip.get = loongson_gpio_get; + lgpio->chip.direction_output = loongson_gpio_direction_output; + lgpio->chip.set = loongson_gpio_set; + lgpio->chip.can_sleep = 0; + lgpio->chip.fwnode = dev_fwnode(dev); + lgpio->chip.parent = dev; + spin_lock_init(&lgpio->lock); + lgpio->base = (void __iomem *)base; + + if (!strcmp(lgpio->chip.label, "loongson,ls7a-gpio") || + !strncmp(lgpio->chip.label, "LOON0002", 8) || + !strcmp(lgpio->chip.label, "loongson,loongson3-gpio") || + !strncmp(lgpio->chip.label, "LOON0007", 8)) {

- loongson_gpio_set_value(chip, gpio, level); - spin_lock(&gpio_lock); - temp = LOONGSON_GPIOIE; - temp &= ~BIT(gpio); - LOONGSON_GPIOIE = temp; - spin_unlock(&gpio_lock); + lgpio->chip.to_irq = loongson_gpio_to_irq; + } + gpiochip_add(&lgpio->chip);

return 0; }

+ +static void of_loongson_gpio_get_props(struct device_node *np, + struct loongson_gpio_chip *lgpio) +{ + const char *name; + + of_property_read_u32(np, "ngpios", (u32 *)&lgpio->chip.ngpio); + of_property_read_u32(np, "gpio_base", (u32 *)&lgpio->chip.base); + of_property_read_u32(np, "conf_offset", (u32 *)&lgpio->conf_offset); + of_property_read_u32(np, "out_offset", (u32 *)&lgpio->out_offset); + of_property_read_u32(np, "in_offset", (u32 *)&lgpio->in_offset); + of_property_read_string(np, "compatible", &name); + if (!strcmp(name, "loongson,loongson3-gpio")) { + of_property_read_u32(np, "in_start_bit", + (u32 *)&lgpio->in_start_bit); + if (of_property_read_bool(np, "support_irq")) + lgpio->support_irq = true; + } + lgpio->chip.label = kstrdup(name, GFP_KERNEL); +} + +static void acpi_loongson_gpio_get_props(struct platform_device *pdev, + struct loongson_gpio_chip *lgpio) +{ + + struct device *dev = &pdev->dev; + int rval; + + device_property_read_u32(dev, "ngpios", (u32 *)&lgpio->chip.ngpio); + device_property_read_u32(dev, "gpio_base", (u32 *)&lgpio->chip.base); + device_property_read_u32(dev, "conf_offset", (u32 *)&lgpio->conf_offset); + device_property_read_u32(dev, "out_offset", (u32 *)&lgpio->out_offset); + device_property_read_u32(dev, "in_offset", (u32 *)&lgpio->in_offset); + rval = device_property_read_u16_array(dev, "gsi_idx_map", NULL, 0); + if (rval > 0) { + lgpio->gsi_idx_map = + kmalloc_array(rval, sizeof(*lgpio->gsi_idx_map), + GFP_KERNEL); + if (unlikely(!lgpio->gsi_idx_map)) { + dev_err(dev, "Alloc gsi_idx_map fail!\n"); + } else { + lgpio->mapsize = rval; + device_property_read_u16_array(dev, "gsi_idx_map", + lgpio->gsi_idx_map, lgpio->mapsize); + } + } + if (!strcmp(pdev->name, "LOON0007")) { + device_property_read_u32(dev, "in_start_bit", + (u32 *)&lgpio->in_start_bit); + if (device_property_read_bool(dev, "support_irq")) + lgpio->support_irq = true; + } + lgpio->chip.label = kstrdup(pdev->name, GFP_KERNEL); +} + +static void platform_loongson_gpio_get_props(struct platform_device *pdev, + struct loongson_gpio_chip *lgpio) +{ + struct platform_gpio_data *gpio_data = + (struct platform_gpio_data *)pdev->dev.platform_data; + + lgpio->chip.ngpio = gpio_data->ngpio; + lgpio->chip.base = gpio_data->gpio_base; + lgpio->conf_offset = gpio_data->gpio_conf; + lgpio->out_offset = gpio_data->gpio_out; + lgpio->in_offset = gpio_data->gpio_in; + if (!strcmp(gpio_data->label, "loongson,loongson3-gpio")) { + lgpio->in_start_bit = gpio_data->in_start_bit; + lgpio->support_irq = gpio_data->support_irq; + } + lgpio->chip.label = kstrdup(gpio_data->label, GFP_KERNEL); +} + static int loongson_gpio_probe(struct platform_device *pdev) { - struct gpio_chip *gc; + struct resource *iores; + void __iomem *base; + struct loongson_gpio_chip *lgpio; + struct device_node *np = pdev->dev.of_node; struct device *dev = &pdev->dev; + int ret = 0;

- gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); - if (!gc) + lgpio = kzalloc(sizeof(struct loongson_gpio_chip), GFP_KERNEL); + if (!lgpio) return -ENOMEM;

- gc->label = "loongson-gpio-chip"; - gc->base = 0; - gc->ngpio = LOONGSON_N_GPIO; - gc->get = loongson_gpio_get_value; - gc->set = loongson_gpio_set_value; - gc->direction_input = loongson_gpio_direction_input; - gc->direction_output = loongson_gpio_direction_output; + if (np) + of_loongson_gpio_get_props(np, lgpio); + else if (ACPI_COMPANION(&pdev->dev)) + acpi_loongson_gpio_get_props(pdev, lgpio); + else + platform_loongson_gpio_get_props(pdev, lgpio); + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!iores) { + ret = -ENODEV; + goto out; + } + if (!request_mem_region(iores->start, resource_size(iores), + pdev->name)) { + ret = -EBUSY; + goto out; + } + base = ioremap(iores->start, resource_size(iores)); + if (!base) { + ret = -ENOMEM; + goto out; + } + platform_set_drvdata(pdev, lgpio); + loongson_gpio_init(dev, lgpio, np, base);

- return gpiochip_add_data(gc, NULL); + return 0; +out: + pr_err("%s: %s: missing mandatory property\n", __func__, np->name); + return ret; }

-static struct platform_driver loongson_gpio_driver = { +static int loongson_gpio_remove(struct platform_device *pdev) +{ + struct loongson_gpio_chip *lgpio = platform_get_drvdata(pdev); + struct resource *mem; + + platform_set_drvdata(pdev, NULL); + gpiochip_remove(&lgpio->chip); + iounmap(lgpio->base); + kfree(lgpio->gsi_idx_map); + kfree(lgpio); + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(mem->start, resource_size(mem)); + return 0; +} + +static const struct of_device_id loongson_gpio_dt_ids[] = { + { .compatible = "loongson,loongson3-gpio"}, + { .compatible = "loongson,ls7a-gpio"}, + {} +}; +MODULE_DEVICE_TABLE(of, loongson_gpio_dt_ids); + +static const struct acpi_device_id loongson_gpio_acpi_match[] = { + {"LOON0002"}, + {"LOON0007"}, + {} +}; +MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match); + +static struct platform_driver ls_gpio_driver = { .driver = { .name = "loongson-gpio", + .owner = THIS_MODULE, + .of_match_table = loongson_gpio_dt_ids, + .acpi_match_table = ACPI_PTR(loongson_gpio_acpi_match), }, .probe = loongson_gpio_probe, + .remove = loongson_gpio_remove, };

static int __init loongson_gpio_setup(void) { - struct platform_device *pdev; - int ret; - - ret = platform_driver_register(&loongson_gpio_driver); - if (ret) { - pr_err("error registering loongson GPIO driver\n"); - return ret; - } + return platform_driver_register(&ls_gpio_driver); +} +subsys_initcall(loongson_gpio_setup);

- pdev = platform_device_register_simple("loongson-gpio", -1, NULL, 0); - return PTR_ERR_OR_ZERO(pdev); +static void __exit loongson_gpio_driver(void) +{ + platform_driver_unregister(&ls_gpio_driver); } -postcore_initcall(loongson_gpio_setup); +module_exit(loongson_gpio_driver); +MODULE_AUTHOR("Loongson Technology Corporation Limited"); +MODULE_DESCRIPTION("LOONGSON GPIO"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:loongson_gpio");