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Message-ID: <CAMRc=McpskmSTS9dn0HWEiZtOdRzV0YTabDmi6aEV98Oc-6X7w@mail.gmail.com>
Date: Mon, 28 Nov 2022 18:54:38 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Yinbo Zhu <zhuyinbo@...ngson.cn>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
WANG Xuerui <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Juxin Gao <gaojuxin@...ngson.cn>,
Bibo Mao <maobibo@...ngson.cn>,
Yanteng Si <siyanteng@...ngson.cn>, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
Arnaud Patard <apatard@...driva.com>,
Huacai Chen <chenhuacai@...nel.org>,
Jianmin Lv <lvjianmin@...ngson.cn>,
Hongchen Zhang <zhanghongchen@...ngson.cn>,
Liu Peibao <liupeibao@...ngson.cn>
Subject: Re: [PATCH v8 1/2] gpio: loongson: add gpio driver support
On Mon, Nov 28, 2022 at 7:43 AM Yinbo Zhu <zhuyinbo@...ngson.cn> wrote:
>
> 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@...ngson.cn>
> Signed-off-by: Hongchen Zhang <zhanghongchen@...ngson.cn>
> Signed-off-by: Liu Peibao <liupeibao@...ngson.cn>
> Signed-off-by: Juxin Gao <gaojuxin@...ngson.cn>
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> 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 | 6 +
> drivers/gpio/Kconfig | 12 +
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-loongson-64bit.c | 378 +++++++++++++++++++++++++++++
> 4 files changed, 397 insertions(+)
> create mode 100644 drivers/gpio/gpio-loongson-64bit.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5114db9c8f32..2854da69cabb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12051,6 +12051,12 @@ S: Maintained
> F: Documentation/devicetree/bindings/hwinfo/loongson,ls2k-chipid.yaml
> F: drivers/soc/loongson/loongson2_guts.c
>
> +LOONGSON GPIO DRIVER
> +M: Yinbo Zhu <zhuyinbo@...ngson.cn>
> +L: linux-gpio@...r.kernel.org
> +S: Maintained
> +F: drivers/gpio/gpio-loongson-64bit.c
> +
> LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
> M: Sathya Prakash <sathya.prakash@...adcom.com>
> M: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index a01af1180616..d3e2380dbacf 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -381,6 +381,18 @@ 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
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 29e3beb6548c..fc832484cc77 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -78,6 +78,7 @@ obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o
> obj-$(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..19a0149480f8
> --- /dev/null
> +++ b/drivers/gpio/gpio-loongson-64bit.c
> @@ -0,0 +1,378 @@
> +// 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->p_data->in_offset)
> +#define LOONGSON_GPIO_OUT(x) (x->reg_base +\
> + x->p_data->out_offset)
> +#define LOONGSON_GPIO_OEN(x) (x->reg_base +\
> + x->p_data->conf_offset)
> +#define LOONGSON_GPIO_IN_BYTE(x, gpio) (x->reg_base +\
> + x->p_data->in_offset + gpio)
> +#define LOONGSON_GPIO_OUT_BYTE(x, gpio) (x->reg_base +\
> + x->p_data->out_offset + gpio)
> +#define LOONGSON_GPIO_OEN_BYTE(x, gpio) (x->reg_base +\
> + x->p_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;
> + int conf_offset;
> + int out_offset;
> + 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 *p_data;
> +};
> +
> +static inline void loongson_commit_direction(
> + struct loongson_gpio_chip *lgpio,
> + unsigned int pin, int input)
> +{
> + u8 bval;
> +
> + 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;
> +
> + 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 =
> + container_of(chip, struct 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)
> +{
> + struct loongson_gpio_chip *lgpio =
> + container_of(chip, struct loongson_gpio_chip, chip);
> + unsigned long flags;
> +
> + 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 =
> + container_of(chip, struct 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 =
> + container_of(chip, struct 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 =
> + container_of(chip, struct 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);
> +
> + if (offset >= chip->ngpio)
> + return -EINVAL;
> +
> + 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 __maybe_unused *parent;
> + struct gpio_irq_chip __maybe_unused *girq;
> + struct device_node __maybe_unused *irq_parent;
> +
> + lgpio->reg_base = reg_base;
> +
> + if (lgpio->p_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->p_data->label;
> +
> + if (lgpio->p_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;
> + }
> +
> + devm_gpiochip_add_data(dev, &lgpio->chip, lgpio);
> +
> + return 0;
> +}
> +
> +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->p_data = device_get_match_data(&pdev->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_pdata0 = {
This pdata0 and pdata1 naming has no meaning here. Please choose
something else like loongson_gpio_ls2k_data.
Bartosz
> + .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_pdata1 = {
> + .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_pdata0,
> + },
> + {
> + .compatible = "loongson,ls7a-gpio",
> + .data = &loongson_gpio_pdata1,
> + },
> + {}
> +};
> +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_pdata1,
> + },
> + {}
> +};
> +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
>
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