Re: [RFC PATCH v2 2/4] irqchip: Add RZ/G2L IA55 Interrupt Controller driver

From: Lad, Prabhakar
Date: Fri Sep 24 2021 - 18:27:50 EST

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Hi Marc,

Thank you for the review.

On Fri, Sep 24, 2021 at 8:01 PM Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> On Tue, 21 Sep 2021 20:30:26 +0100,
> Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> wrote:
> >
> > Add a driver for the Renesas RZ/G2L Interrupt Controller.
> >
> > This supports external pins being used as interrupts. It supports
> > one line for NMI, 8 external pins and 32 GPIO pins (out of 123)
> > to be used as IRQ lines.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> > ---
> > drivers/irqchip/Kconfig | 9 +
> > drivers/irqchip/Makefile | 1 +
> > drivers/irqchip/irq-renesas-rzg2l.c | 393 ++++++++++++++++++++++++++++
> > drivers/soc/renesas/Kconfig | 1 +
> > 4 files changed, 404 insertions(+)
> > create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c
> >
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> > index 4d5924e9f766..b61dceac8628 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -236,6 +236,15 @@ config RENESAS_RZA1_IRQC
> > Enable support for the Renesas RZ/A1 Interrupt Controller, to use up
> > to 8 external interrupts with configurable sense select.
> >
> > +config RENESAS_RZG2L_IRQC
> > + bool "Renesas RZ/G2L IRQC support" if COMPILE_TEST
> > + select GENERIC_IRQ_CHIP
> > + select IRQ_DOMAIN
> > + select IRQ_DOMAIN_HIERARCHY
> > + help
> > + Enable support for the Renesas RZ/G2L Interrupt Controller for external
> > + devices.
> > +
> > config SL28CPLD_INTC
> > bool "Kontron sl28cpld IRQ controller"
> > depends on MFD_SL28CPLD=y || COMPILE_TEST
> > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> > index f88cbf36a9d2..8017786fbdac 100644
> > --- a/drivers/irqchip/Makefile
> > +++ b/drivers/irqchip/Makefile
> > @@ -51,6 +51,7 @@ obj-$(CONFIG_RDA_INTC) += irq-rda-intc.o
> > obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o
> > obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o
> > obj-$(CONFIG_RENESAS_RZA1_IRQC) += irq-renesas-rza1.o
> > +obj-$(CONFIG_RENESAS_RZG2L_IRQC) += irq-renesas-rzg2l.o
> > obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
> > obj-$(CONFIG_ARCH_NSPIRE) += irq-zevio.o
> > obj-$(CONFIG_ARCH_VT8500) += irq-vt8500.o
> > diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
> > new file mode 100644
> > index 000000000000..8057fdf6781b
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-renesas-rzg2l.c
> > @@ -0,0 +1,393 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Renesas RZ/G2L IRQC Driver
> > + *
> > + * Copyright (C) 2021 Renesas Electronics Corporation.
> > + */
> > +
> > +#include <linux/err.h>
> > +#include <linux/init.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdesc.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/module.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +
> > +#define IRQC_IRQ_START 1
> > +#define IRQC_IRQ_COUNT 8
> > +#define IRQC_TINT_START 9
> > +#define IRQC_TINT_COUNT 32
> > +#define IRQC_NUM_IRQ 41
> > +
> > +#define ISCR 0x10
> > +#define IITSR 0x14
> > +#define TSCR 0x20
> > +#define TITSR0 0x24
> > +#define TITSR1 0x28
> > +#define TITSR0_MAX_INT 16
> > +#define TITSEL_WIDTH 0x2
> > +#define TSSR(n) (0x30 + ((n) * 4))
> > +#define TIEN BIT(7)
> > +#define TSSEL_SHIFT(n) (8 * (n))
> > +#define TSSEL_MASK GENMASK(7, 0)
> > +#define IRQ_MASK 0x3
> > +
> > +#define TSSR_OFFSET(n) ((n) % 4)
> > +#define TSSR_INDEX(n) ((n) / 4)
> > +
> > +#define TITSR_TITSEL_EDGE_RISING 0
> > +#define TITSR_TITSEL_EDGE_FALLING 1
> > +#define TITSR_TITSEL_LEVEL_HIGH 2
> > +#define TITSR_TITSEL_LEVEL_LOW 3
> > +
> > +struct rzg2l_irqc_priv {
> > + void __iomem *base;
> > + struct device *dev;
> > + struct irq_chip chip;
> > + struct irq_domain *irq_domain;
> > + struct resource *irq[IRQC_NUM_IRQ];
> > + struct mutex irqc_mutex;
> > + struct mutex tint_mutex; /* Mutex to protect tint_slot bitmap */
> > + DECLARE_BITMAP(tint_slot, IRQC_TINT_COUNT);
> > +};
> > +
> > +struct rzg2l_irqc_chip_data {
> > + struct rzg2l_irqc_priv *priv;
> > + int tint;
> > + int hwirq;
> > +};
> > +
> > +static int rzg2l_tint_set_edge(struct rzg2l_irqc_priv *priv,
> > + unsigned int hwirq, unsigned int type)
> > +{
> > + u32 port = hwirq - IRQC_TINT_START;
> > + u8 sense;
> > + u32 reg;
> > +
> > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > + case IRQ_TYPE_EDGE_RISING:
> > + sense = TITSR_TITSEL_EDGE_RISING;
> > + break;
> > +
> > + case IRQ_TYPE_EDGE_FALLING:
> > + sense = TITSR_TITSEL_EDGE_FALLING;
> > + break;
> > +
> > + case IRQ_TYPE_LEVEL_HIGH:
> > + sense = TITSR_TITSEL_LEVEL_HIGH;
> > + break;
> > +
> > + case IRQ_TYPE_LEVEL_LOW:
> > + sense = TITSR_TITSEL_LEVEL_LOW;
> > + break;
> > +
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + mutex_lock(&priv->irqc_mutex);
>
> Have you tested this code with lockdep? This cannot possibly work,
> since all the irqchip callbacks are running under a per-irq raw
> spinlock.
>
Yes I have tested with a GPIO pin being set as an interrupt.

root@smarc-rzg2l:~# cat /proc/interrupts | grep SW3
127: 1 0 11030000.pin-controller 72 Edge SW3
root@smarc-rzg2l:~# cd /sys/kernel/debug/irq/irqs/
root@smarc-rzg2l:/sys/kernel/debug/irq/irqs# cat 127
handler: handle_fasteoi_irq
device: (null)
status: 0x00000002
istate: 0x00000000
ddepth: 0
wdepth: 0
dstate: 0x13400202
IRQ_TYPE_EDGE_FALLING
IRQD_ACTIVATED
IRQD_IRQ_STARTED
IRQD_SINGLE_TARGET
IRQD_DEFAULT_TRIGGER_SET
IRQD_HANDLE_ENFORCE_IRQCTX
node: -1
affinity: 0-1
effectiv:
domain: :soc:pin-controller@11030000
hwirq: 0x48
chip: 11030000.pin-controller
flags: 0x1
IRQCHIP_SET_TYPE_MASKED
parent:
domain: :soc:interrupt-controller@110a0000
hwirq: 0x9
chip: rzg2l-irqc
flags: 0x14
IRQCHIP_MASK_ON_SUSPEND
IRQCHIP_SKIP_SET_WAKE
parent:
domain: :soc:interrupt-controller@11900000-1
hwirq: 0x60
chip: GICv3
flags: 0x15
IRQCHIP_SET_TYPE_MASKED
IRQCHIP_MASK_ON_SUSPEND
IRQCHIP_SKIP_SET_WAKE
root@smarc-rzg2l:/sys/kernel/debug/irq/irqs#

> > + if (port < TITSR0_MAX_INT) {
> > + reg = readl_relaxed(priv->base + TITSR0);
> > + reg &= ~(IRQ_MASK << (port * TITSEL_WIDTH));
> > + reg |= sense << (port * TITSEL_WIDTH);
> > + writel_relaxed(reg, priv->base + TITSR0);
> > + } else {
> > + port = port / TITSEL_WIDTH;
> > + reg = readl_relaxed(priv->base + TITSR1);
> > + reg &= ~(IRQ_MASK << (port * TITSEL_WIDTH));
> > + reg |= sense << (port * TITSEL_WIDTH);
> > + writel_relaxed(reg, priv->base + TITSR1);
> > + }
> > + mutex_unlock(&priv->irqc_mutex);
> > +
> > + return 0;
> > +}
> > +
> > +static void rzg2l_irqc_tint_irq_handler(struct irq_desc *desc)
> > +{
> > + unsigned int irq = irq_desc_get_irq(desc);
> > + struct irq_chip *chip = irq_desc_get_chip(desc);
> > + struct rzg2l_irqc_chip_data *chip_data = irq_get_handler_data(irq);
> > + struct rzg2l_irqc_priv *priv = chip_data->priv;
> > + unsigned int offset;
> > + u32 reg;
> > +
> > + chained_irq_enter(chip, desc);
> > + offset = chip_data->hwirq - IRQC_TINT_START;
> > + generic_handle_domain_irq(priv->irq_domain, chip_data->hwirq);
> > + reg = readl_relaxed(priv->base + TSCR) & ~BIT(offset);
> > + writel_relaxed(reg, priv->base + TSCR);
>
> What is this operation? If that's an ack, it is way too late. And
> whether it is an ack or an eoi, it must be in a callback.
>
Ok, I will move this to the eoi callback.

> > + chained_irq_exit(chip, desc);
> > +}
> > +
> > +static void rzg2l_irqc_irq_disable(struct irq_data *d)
> > +{
> > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > + struct rzg2l_irqc_priv *priv = chip_data->priv;
> > +
> > + if (chip_data->tint != -EINVAL) {
> > + u32 offset = chip_data->hwirq - IRQC_TINT_START;
> > + u32 tssr_offset = TSSR_OFFSET(offset);
> > + u8 tssr_index = TSSR_INDEX(offset);
> > + u32 reg;
> > +
> > + irq_set_chained_handler_and_data(priv->irq[chip_data->hwirq]->start,
> > + NULL, NULL);
> > +
> > + mutex_lock(&priv->irqc_mutex);
> > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > + reg &= ~(TSSEL_MASK << tssr_offset);
> > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > + mutex_unlock(&priv->irqc_mutex);
> > + }
> > +}
> > +
> > +static void rzg2l_irqc_irq_enable(struct irq_data *d)
> > +{
> > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > + struct rzg2l_irqc_priv *priv = chip_data->priv;
> > +
> > + if (chip_data->tint != -EINVAL) {
> > + u32 offset = chip_data->hwirq - IRQC_TINT_START;
> > + u32 tssr_offset = TSSR_OFFSET(offset);
> > + u8 tssr_index = TSSR_INDEX(offset);
> > + u32 reg;
> > +
> > + irq_set_chained_handler_and_data(priv->irq[chip_data->hwirq]->start,
> > + rzg2l_irqc_tint_irq_handler,
> > + chip_data);
> > +
> > + mutex_lock(&priv->irqc_mutex);
> > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > + reg |= (TIEN | chip_data->tint) << TSSEL_SHIFT(tssr_offset);
> > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > + mutex_unlock(&priv->irqc_mutex);
> > + }
> > +}
>
> These two function make little sense. Why isn't the chained handler
> wired once and for all?
>
you mean to move this during alloc callback? chained handler is
registered only when an GPIO line is requested as interrupt as a
result I am wiring only upon requests.

> > +
> > +static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type)
> > +{
> > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > + struct rzg2l_irqc_priv *priv = chip_data->priv;
> > +
> > + if (chip_data->tint != EINVAL)
> > + return rzg2l_tint_set_edge(priv, chip_data->hwirq, type);
>
> Inline this function here. There is no point in having this helper on
> its own with a single call site.
>
Ok, I will make this inline.

> > +
> > + return -EINVAL;
> > +}
> > +
> > +static int rzg2l_irqc_domain_alloc(struct irq_domain *domain, unsigned int virq,
> > + unsigned int nr_irqs, void *arg)
> > +{
> > + struct rzg2l_irqc_priv *priv = domain->host_data;
> > + struct rzg2l_irqc_chip_data *chip_data = NULL;
> > + struct irq_fwspec parent_fwspec;
> > + struct irq_fwspec *fwspec = arg;
> > + int tint = -EINVAL;
> > + irq_hw_number_t hwirq;
> > + int irq = -EINVAL;
> > + unsigned int type;
> > + int ret;
> > +
> > + chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
> > + if (!chip_data)
> > + return -ENOMEM;
>
> Why do you need to allocate per interrupt chip-specific data?
>
To ack and trigger the virq in the domain. Let me know if there is a
much better way of doing this.

> > +
> > + ret = irq_domain_translate_twocell(domain, arg, &hwirq, &type);
> > + if (ret)
> > + return ret;
> > +
> > + /*
> > + * When alloc has landed from pinctrl driver:
> > + * fwspec->param_count = 3
> > + * fwspec->param[0] = tint
> > + * fwspec->param[1] = type
> > + * fwspec->param[2] = 1
> > + */
> > + if (fwspec->param_count == 3 && fwspec->param[2]) {
> > + mutex_lock(&priv->tint_mutex);
> > + irq = bitmap_find_free_region(priv->tint_slot, IRQC_TINT_COUNT, get_order(1));
>
> I think you can replace this get_order() with the result.
>
> > + if (irq < 0) {
> > + mutex_unlock(&priv->tint_mutex);
> > + return -ENOSPC;
> > + }
> > + mutex_unlock(&priv->tint_mutex);
> > + tint = hwirq;
> > + hwirq = irq + IRQC_TINT_START;
> > + }
> > +
> > + chip_data->priv = priv;
> > + chip_data->tint = tint;
> > + chip_data->hwirq = hwirq;
>
> Really?
Could you please elaborate here.

As per the current implementation here
pinctrl->irqc->GIC
The SoC supports 123 GPIO pins out of which a max of 32 can be
configured as an interrupt line into the irqc.

keyboard {
compatible = "gpio-keys";
status = "okay";

key-3 {
gpios = <&pinctrl RZG2L_GPIO(9, 0) GPIO_ACTIVE_HIGH>;
linux,code = <KEY_3>;
label = "SW3";
wakeup-source;
};
};
For example with the above the pinctrl driver passes interrupt number
to be programmed into irqc corresponding to RZG2L_GPIO(9, 0), type
and third parameter tint indicating this is coming from pinctrl (as
irqc supports gpio/irq/nmi). When this lands in the irqc domain with
the above we find the first available slot from 32 interrupts and
hwirq is set to irq + IRQC_TINT_START if its first slot it would be
0+9.

>
> > + ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &priv->chip, chip_data);
> > + if (ret)
> > + goto release_bitmap;
> > +
> > + /* parent is GIC */
> > + parent_fwspec.fwnode = domain->parent->fwnode;
> > + parent_fwspec.param_count = 3;
> > + parent_fwspec.param[0] = 0; /* SPI */
> > + parent_fwspec.param[1] = priv->irq[hwirq]->start;
> > + parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
> > + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_fwspec);
This is the bit which is I am unclear about as I am requesting a
chained handler I believe this should be done automatically and is not
required. Is my understanding correct here?

> > + if (ret)
> > + goto release_bitmap;
> > +
> > + return 0;
> > +
> > +release_bitmap:
> > + if (tint != -EINVAL) {
> > + mutex_lock(&priv->tint_mutex);
> > + bitmap_release_region(priv->tint_slot, irq, get_order(1));
> > + mutex_unlock(&priv->tint_mutex);
> > + }
> > + kfree(chip_data);
> > + return ret;
> > +}
> > +
> > +static void rzg2l_irqc_domain_free(struct irq_domain *domain, unsigned int virq,
> > + unsigned int nr_irqs)
> > +{
> > + struct rzg2l_irqc_chip_data *chip_data;
> > + struct rzg2l_irqc_priv *priv;
> > + struct irq_data *d;
> > +
> > + d = irq_domain_get_irq_data(domain, virq);
> > + if (d) {
> > + chip_data = d->chip_data;
> > + priv = chip_data->priv;
> > + if (chip_data) {
> > + if (chip_data->tint != -EINVAL) {
> > + mutex_lock(&priv->tint_mutex);
> > + bitmap_release_region(priv->tint_slot,
> > + chip_data->hwirq - IRQC_TINT_START,
> > + get_order(1));
> > + mutex_unlock(&priv->tint_mutex);
> > + }
> > + kfree(chip_data);
> > + }
> > + }
> > +
> > + irq_domain_free_irqs_common(domain, virq, nr_irqs);
> > +}
> > +
> > +static const struct irq_domain_ops rzg2l_irqc_domain_ops = {
> > + .alloc = rzg2l_irqc_domain_alloc,
> > + .free = rzg2l_irqc_domain_free,
> > + .translate = irq_domain_translate_twocell,
> > +};
> > +
> > +static int rzg2l_irqc_probe(struct platform_device *pdev)
> > +{
> > + struct irq_domain *parent_irq_domain;
> > + struct device *dev = &pdev->dev;
> > + struct device_node *np = dev->of_node;
> > + struct device_node *gic_node;
> > + struct rzg2l_irqc_priv *priv;
> > + unsigned int i;
> > + int ret;
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, priv);
> > + priv->dev = dev;
> > +
> > + priv->base = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(priv->base))
> > + return PTR_ERR(priv->base);
> > +
> > + gic_node = of_irq_find_parent(np);
> > + if (gic_node)
> > + parent_irq_domain = irq_find_host(gic_node);
> > +
> > + if (!parent_irq_domain) {
> > + dev_err(dev, "cannot find parent domain\n");
> > + ret = -ENODEV;
> > + goto out_put_node;
> > + }
> > +
> > + for (i = 0; i < IRQC_NUM_IRQ; i++) {
> > + priv->irq[i] = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> > + if (!priv->irq[i]) {
> > + ret = -ENOENT;
> > + dev_err(dev, "failed to get irq resource(%u)", i);
> > + goto out_put_node;
> > + }
> > + }
> > +
> > + mutex_init(&priv->irqc_mutex);
> > + mutex_init(&priv->tint_mutex);
> > + pm_runtime_enable(&pdev->dev);
> > + pm_runtime_resume_and_get(&pdev->dev);
> > +
> > + priv->chip.name = "rzg2l-irqc";
> > + priv->chip.irq_mask = irq_chip_mask_parent;
> > + priv->chip.irq_unmask = irq_chip_unmask_parent;
> > + priv->chip.irq_enable = rzg2l_irqc_irq_enable;
> > + priv->chip.irq_disable = rzg2l_irqc_irq_disable;
> > + priv->chip.irq_retrigger = irq_chip_retrigger_hierarchy;
> > + priv->chip.irq_set_type = rzg2l_irqc_set_type;
>
> Move the irqchip structure out of rzg2l_irqc_priv, make it
> static. There is no reason why it should be dynamically allocated and
> not shared across all instances.
>
OK will move that outside.

> > + priv->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
> > + priv->irq_domain = irq_domain_add_hierarchy(parent_irq_domain, 0,
> > + IRQC_NUM_IRQ, np,
> > + &rzg2l_irqc_domain_ops,
> > + priv);
>
> Why a hierarchy? This isn't a hierarchical setup at all.
>
Chained handlers should be irq_domain_add_linear()?

> > + if (!priv->irq_domain) {
> > + dev_err(dev, "cannot initialize irq domain\n");
> > + ret = -ENOMEM;
> > + pm_runtime_put(&pdev->dev);
> > + pm_runtime_disable(&pdev->dev);
> > + goto out_put_node;
> > + }
> > +
> > +out_put_node:
> > + of_node_put(gic_node);
> > + return ret;
> > +}
> > +
> > +static int rzg2l_irqc_remove(struct platform_device *pdev)
> > +{
> > + struct rzg2l_irqc_priv *priv = platform_get_drvdata(pdev);
> > +
> > + irq_domain_remove(priv->irq_domain);
> > + pm_runtime_put(&pdev->dev);
> > + pm_runtime_disable(&pdev->dev);
> > + return 0;
> > +}
>
> No. interrupt controllers cannot be removed. Once in, they don't
> leave.
>
Ok, I will drop this.

> > +
> > +static const struct of_device_id rzg2l_irqc_dt_ids[] = {
> > + { .compatible = "renesas,rzg2l-irqc" },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(of, rzg2l_irqc_dt_ids);
> > +
> > +static struct platform_driver rzg2l_irqc_device_driver = {
> > + .probe = rzg2l_irqc_probe,
> > + .remove = rzg2l_irqc_remove,
> > + .driver = {
> > + .name = "renesas_rzg2l_irqc",
> > + .of_match_table = rzg2l_irqc_dt_ids,
> > + }
> > +};
> > +
> > +static int __init rzg2l_irqc_init(void)
> > +{
> > + return platform_driver_register(&rzg2l_irqc_device_driver);
> > +}
> > +postcore_initcall(rzg2l_irqc_init);
> > +
> > +static void __exit rzg2l_irqc_exit(void)
> > +{
> > + platform_driver_unregister(&rzg2l_irqc_device_driver);
> > +}
> > +module_exit(rzg2l_irqc_exit);
>
> Please use the relevant irqchip helpers to declare an irqchip module:
> IRQCHIP_PLATFORM_DRIVER_BEGIN, IRQCHIP_MATCH,
> IRQCHIP_PLATFORM_DRIVER_END.
>
I will use them in the next version.

Cheers,
Prabhakar

> M.
>
> --
> Without deviation from the norm, progress is not possible.

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