Re: [PATCH v4 1/2] gpio: mlxbf2: Introduce IRQ support

Bartosz Golaszewski
2021-10-15T07:01:33Z

On Fri, Oct 8, 2021 at 4:50 PM Asmaa Mnebhi <asmaa@nvidia.com> wrote:
>
> Introduce standard IRQ handling in the gpio-mlxbf2.c
> driver.
>
> Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
> ---
> drivers/gpio/gpio-mlxbf2.c | 147 ++++++++++++++++++++++++++++++++++++-
> 1 file changed, 145 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mlxbf2.c b/drivers/gpio/gpio-mlxbf2.c
> index 177d03ef4529..3d89912a05b8 100644
> --- a/drivers/gpio/gpio-mlxbf2.c
> +++ b/drivers/gpio/gpio-mlxbf2.c
> @@ -1,9 +1,14 @@
> // SPDX-License-Identifier: GPL-2.0
>
> +/*
> + * Copyright (C) 2020-2021 NVIDIA CORPORATION & AFFILIATES
> + */
> +
> #include <linux/bitfield.h>
> #include <linux/bitops.h>
> #include <linux/device.h>
> #include <linux/gpio/driver.h>
> +#include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/ioport.h>
> #include <linux/kernel.h>
> @@ -43,9 +48,14 @@
> #define YU_GPIO_MODE0 0x0c
> #define YU_GPIO_DATASET 0x14
> #define YU_GPIO_DATACLEAR 0x18
> +#define YU_GPIO_CAUSE_RISE_EN 0x44
> +#define YU_GPIO_CAUSE_FALL_EN 0x48
> #define YU_GPIO_MODE1_CLEAR 0x50
> #define YU_GPIO_MODE0_SET 0x54
> #define YU_GPIO_MODE0_CLEAR 0x58
> +#define YU_GPIO_CAUSE_OR_CAUSE_EVTEN0 0x80
> +#define YU_GPIO_CAUSE_OR_EVTEN0 0x94
> +#define YU_GPIO_CAUSE_OR_CLRCAUSE 0x98
>
> struct mlxbf2_gpio_context_save_regs {
> u32 gpio_mode0;
> @@ -55,6 +65,7 @@ struct mlxbf2_gpio_context_save_regs {
> /* BlueField-2 gpio block context structure. */
> struct mlxbf2_gpio_context {
> struct gpio_chip gc;
> + struct irq_chip irq_chip;
>
> /* YU GPIO blocks address */
> void __iomem *gpio_io;
> @@ -218,15 +229,114 @@ static int mlxbf2_gpio_direction_output(struct gpio_chip *chip,
> return ret;
> }
>
> +static void mlxbf2_gpio_irq_enable(struct irq_data *irqd)
> +{
> + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
> + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
> + int offset = irqd_to_hwirq(irqd);
> + unsigned long flags;
> + u32 val;
> +
> + spin_lock_irqsave(&gs->gc.bgpio_lock, flags);
> + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE);
> + val |= BIT(offset);
> + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE);
> +
> + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
> + val |= BIT(offset);
> + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
> + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags);
> +}
> +
> +static void mlxbf2_gpio_irq_disable(struct irq_data *irqd)
> +{
> + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
> + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
> + int offset = irqd_to_hwirq(irqd);
> + unsigned long flags;
> + u32 val;
> +
> + spin_lock_irqsave(&gs->gc.bgpio_lock, flags);
> + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
> + val &= ~BIT(offset);
> + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
> + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags);
> +}
> +
> +static irqreturn_t mlxbf2_gpio_irq_handler(int irq, void *ptr)
> +{
> + struct mlxbf2_gpio_context *gs = ptr;
> + struct gpio_chip *gc = &gs->gc;
> + unsigned long pending;
> + u32 level;
> +
> + pending = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CAUSE_EVTEN0);
> + writel(pending, gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE);
> +
> + for_each_set_bit(level, &pending, gc->ngpio) {
> + int gpio_irq = irq_find_mapping(gc->irq.domain, level);
> + generic_handle_irq(gpio_irq);
> + }
> +
> + return IRQ_RETVAL(pending);
> +}
> +
> +static int
> +mlxbf2_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
> +{
> + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
> + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
> + int offset = irqd_to_hwirq(irqd);
> + unsigned long flags;
> + bool fall = false;
> + bool rise = false;
> + u32 val;
> +
> + switch (type & IRQ_TYPE_SENSE_MASK) {
> + case IRQ_TYPE_EDGE_BOTH:
> + fall = true;
> + rise = true;
> + break;
> + case IRQ_TYPE_EDGE_RISING:
> + rise = true;
> + break;
> + case IRQ_TYPE_EDGE_FALLING:
> + fall = true;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + spin_lock_irqsave(&gs->gc.bgpio_lock, flags);
> + if (fall) {
> + val = readl(gs->gpio_io + YU_GPIO_CAUSE_FALL_EN);
> + val |= BIT(offset);
> + writel(val, gs->gpio_io + YU_GPIO_CAUSE_FALL_EN);
> + }
> +
> + if (rise) {
> + val = readl(gs->gpio_io + YU_GPIO_CAUSE_RISE_EN);
> + val |= BIT(offset);
> + writel(val, gs->gpio_io + YU_GPIO_CAUSE_RISE_EN);
> + }
> + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags);
> +
> + return 0;
> +}
> +
> /* BlueField-2 GPIO driver initialization routine. */
> static int
> mlxbf2_gpio_probe(struct platform_device *pdev)
> {
> struct mlxbf2_gpio_context *gs;
> struct device *dev = &pdev->dev;
> + struct gpio_irq_chip *girq;
> struct gpio_chip *gc;
> unsigned int npins;
> - int ret;
> + const char *name;
> + int ret, irq;
> +
> + name = dev_name(dev);
>
> gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL);
> if (!gs)
> @@ -256,11 +366,44 @@ mlxbf2_gpio_probe(struct platform_device *pdev)
> NULL,
> 0);
>
> + if (ret) {
> + dev_err(dev, "bgpio_init failed\n");
> + return ret;
> + }

This is a correct fix but it should be sent as a fix aimed for stable
in a separate branch, as we want that to be backported.

Other than that it looks good to me, which tree do you want it to go through?

Bart

> +
> gc->direction_input = mlxbf2_gpio_direction_input;
> gc->direction_output = mlxbf2_gpio_direction_output;
> gc->ngpio = npins;
> gc->owner = THIS_MODULE;
>
> + irq = platform_get_irq(pdev, 0);
> + if (irq >= 0) {
> + gs->irq_chip.name = name;
> + gs->irq_chip.irq_set_type = mlxbf2_gpio_irq_set_type;
> + gs->irq_chip.irq_enable = mlxbf2_gpio_irq_enable;
> + gs->irq_chip.irq_disable = mlxbf2_gpio_irq_disable;
> +
> + girq = &gs->gc.irq;
> + girq->chip = &gs->irq_chip;
> + girq->handler = handle_simple_irq;
> + girq->default_type = IRQ_TYPE_NONE;
> + /* This will let us handle the parent IRQ in the driver */
> + girq->num_parents = 0;
> + girq->parents = NULL;
> + girq->parent_handler = NULL;
> +
> + /*
> + * Directly request the irq here instead of passing
> + * a flow-handler because the irq is shared.
> + */
> + ret = devm_request_irq(dev, irq, mlxbf2_gpio_irq_handler,
> + IRQF_SHARED, name, gs);
> + if (ret) {
> + dev_err(dev, "failed to request IRQ");
> + return ret;
> + }
> + }
> +
> platform_set_drvdata(pdev, gs);
>
> ret = devm_gpiochip_add_data(dev, &gs->gc, gs);
> @@ -315,5 +458,5 @@ static struct platform_driver mlxbf2_gpio_driver = {
> module_platform_driver(mlxbf2_gpio_driver);
>
> MODULE_DESCRIPTION("Mellanox BlueField-2 GPIO Driver");
> -MODULE_AUTHOR("Mellanox Technologies");
> +MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");
> MODULE_LICENSE("GPL v2");
> --
> 2.30.1
>