Re: [PATCH v3 2/5] irqchip: Add RZ/G2L IA55 Interrupt Controller driver

Lad, Prabhakar
2022-05-12T18:01:44Z

Hi Biju,

Thank you for the review.

On Wed, May 11, 2022 at 8:25 PM Biju Das <biju.das.jz@bp.renesas.com> wrote:
>
> Hi Prabhakar,
>
> > Subject: [PATCH v3 2/5] irqchip: Add RZ/G2L IA55 Interrupt Controller
> > driver
> >
> > 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@bp.renesas.com>
> > ---
> > drivers/irqchip/Kconfig | 8 +
> > drivers/irqchip/Makefile | 1 +
> > drivers/irqchip/irq-renesas-rzg2l.c | 444 ++++++++++++++++++++++++++++
> > 3 files changed, 453 insertions(+)
> > create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c
> >
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index
> > 15edb9a6fcae..f3d071422f3b 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -242,6 +242,14 @@ 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 (and alike SoC) IRQC support" if COMPILE_TEST
> > + select GENERIC_IRQ_CHIP
> > + select IRQ_DOMAIN_HIERARCHY
> > + help
> > + Enable support for the Renesas RZ/G2L (and alike SoC) 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
> > 160a1d8ceaa9..eaa56eec2b23 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..61435d8dbe1a
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-renesas-rzg2l.c
> > @@ -0,0 +1,444 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Renesas RZ/G2L IRQC Driver
> > + *
> > + * Copyright (C) 2022 Renesas Electronics Corporation.
> > + *
> > + * Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/irqchip.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/of_address.h>
> > +#include <linux/reset.h>
> > +#include <linux/spinlock.h>
> > +
> > +#define IRQC_IRQ_START 1
> > +#define IRQC_IRQ_COUNT 8
> > +#define IRQC_TINT_START (IRQC_IRQ_START + IRQC_IRQ_COUNT)
> > +#define IRQC_TINT_COUNT 32
> > +#define IRQC_NUM_IRQ (IRQC_TINT_START + IRQC_TINT_COUNT)
> > +
> > +#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
> > +
> > +#define IITSR_IITSEL(n, sense) ((sense) << ((n) * 2))
> > +#define IITSR_IITSEL_LEVEL_LOW 0
> > +#define IITSR_IITSEL_EDGE_FALLING 1
> > +#define IITSR_IITSEL_EDGE_RISING 2
> > +#define IITSR_IITSEL_EDGE_BOTH 3
> > +#define IITSR_IITSEL_MASK(n) IITSR_IITSEL((n), 3)
> > +
> > +#define TINT_EXTRACT_HWIRQ(x) ((x) & ~GENMASK(31, 16))
> > +#define TINT_EXTRACT_GPIOINT(x) ((x) >> 16)
> > +
> > +struct rzg2l_irqc_priv {
> > + void __iomem *base;
> > + struct of_phandle_args map[IRQC_NUM_IRQ];
> > + raw_spinlock_t lock;
> > +};
> > +
> > +struct rzg2l_irqc_chip_data {
> > + int tint;
> > +};
> > +
> > +static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data *data)
> > +{
> > + return data->domain->host_data;
> > +}
> > +
> > +static void rzg2l_irq_eoi(struct irq_data *d) {
> > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + u32 bit = BIT(hw_irq);
> > + u32 reg;
> > +
> > + reg = readl_relaxed(priv->base + ISCR);
> > + if (reg & bit)
> > + writel_relaxed(reg & ~bit, priv->base + ISCR); }
> > +
> > +static void rzg2l_tint_eoi(struct irq_data *d) {
> > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_TINT_START;
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + u32 bit = BIT(hw_irq);
> > + u32 reg;
> > +
> > + reg = readl_relaxed(priv->base + TSCR);
> > + if (reg & bit)
> > + writel_relaxed(reg & ~bit, priv->base + TSCR); }
> > +
> > +static void rzg2l_irqc_eoi(struct irq_data *d) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + unsigned int hw_irq = irqd_to_hwirq(d);
> > +
> > + raw_spin_lock(&priv->lock);
> > + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
> > + rzg2l_irq_eoi(d);
> > + else if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT)
> > + rzg2l_tint_eoi(d);
> > + raw_spin_unlock(&priv->lock);
> > + irq_chip_eoi_parent(d);
> > +}
> > +
> > +static void rzg2l_irqc_irq_disable(struct irq_data *d) {
> > + unsigned int hw_irq = irqd_to_hwirq(d);
> > +
> > + if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + u32 offset = hw_irq - IRQC_TINT_START;
> > + u32 tssr_offset = TSSR_OFFSET(offset);
> > + u8 tssr_index = TSSR_INDEX(offset);
> > + u32 reg;
> > +
> > + raw_spin_lock(&priv->lock);
> > + reg = readl_relaxed(priv->base + TSSR(tssr_index));
> > + reg &= ~(TSSEL_MASK << tssr_offset);
> > + writel_relaxed(reg, priv->base + TSSR(tssr_index));
> > + raw_spin_unlock(&priv->lock);
> > + }
> > + irq_chip_disable_parent(d);
> > +}
> > +
> > +static void rzg2l_irqc_irq_enable(struct irq_data *d) {
> > + unsigned int hw_irq = irqd_to_hwirq(d);
> > +
> > + if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + struct rzg2l_irqc_chip_data *chip_data = d->chip_data;
> > + u32 offset = hw_irq - IRQC_TINT_START;
> > + u32 tssr_offset = TSSR_OFFSET(offset);
> > + u8 tssr_index = TSSR_INDEX(offset);
> > + u32 reg;
> > +
> > + raw_spin_lock(&priv->lock);
> > + 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));
> > + raw_spin_unlock(&priv->lock);
> > + }
> > + irq_chip_enable_parent(d);
> > +}
> > +
> > +static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type) {
> > + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + u16 sense, tmp;
> > +
> > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > + case IRQ_TYPE_LEVEL_LOW:
> > + sense = IITSR_IITSEL_LEVEL_LOW;
> > + break;
> > +
> > + case IRQ_TYPE_EDGE_FALLING:
> > + sense = IITSR_IITSEL_EDGE_FALLING;
> > + break;
> > +
> > + case IRQ_TYPE_EDGE_RISING:
> > + sense = IITSR_IITSEL_EDGE_RISING;
> > + break;
> > +
> > + case IRQ_TYPE_EDGE_BOTH:
> > + sense = IITSR_IITSEL_EDGE_BOTH;
> > + break;
> > +
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + raw_spin_lock(&priv->lock);
> > + tmp = readl_relaxed(priv->base + IITSR);
> > + tmp &= ~IITSR_IITSEL_MASK(hw_irq);
> > + tmp |= IITSR_IITSEL(hw_irq, sense);
> > + writel_relaxed(tmp, priv->base + IITSR);
> > + raw_spin_unlock(&priv->lock);
> > +
> > + return 0;
> > +}
> > +
> > +static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type) {
> > + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
> > + unsigned int hwirq = irqd_to_hwirq(d);
> > + u32 titseln = hwirq - IRQC_TINT_START;
> > + u32 offset;
> > + 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;
> > +
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + offset = TITSR0;
> > + if (titseln >= TITSR0_MAX_INT) {
> > + titseln -= TITSR0_MAX_INT;
> > + offset = TITSR1;
> > + }
> > +
> > + raw_spin_lock(&priv->lock);
> > + reg = readl_relaxed(priv->base + offset);
> > + reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
> > + reg |= sense << (titseln * TITSEL_WIDTH);
> > + writel_relaxed(reg, priv->base + offset);
> > + raw_spin_unlock(&priv->lock);
> > +
> > + return 0;
> > +}
> > +
> > +static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type) {
> > + unsigned int hw_irq = irqd_to_hwirq(d);
> > + int ret = -EINVAL;
> > +
> > + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
> > + ret = rzg2l_irq_set_type(d, type);
> > + else if (hw_irq >= IRQC_TINT_START && hw_irq <= IRQC_TINT_COUNT)
> > + ret = rzg2l_tint_set_edge(d, type);
> > + if (ret)
> > + return ret;
> > +
> > + return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); }
> > +
> > +static struct irq_chip irqc_chip = {
> > + .name = "rzg2l-irqc",
> > + .irq_eoi = rzg2l_irqc_eoi,
> > + .irq_mask = irq_chip_mask_parent,
> > + .irq_unmask = irq_chip_unmask_parent,
> > + .irq_disable = rzg2l_irqc_irq_disable,
> > + .irq_enable = rzg2l_irqc_irq_enable,
> > + .irq_get_irqchip_state = irq_chip_get_parent_state,
> > + .irq_set_irqchip_state = irq_chip_set_parent_state,
> > + .irq_retrigger = irq_chip_retrigger_hierarchy,
> > + .irq_set_type = rzg2l_irqc_set_type,
> > + .flags = IRQCHIP_MASK_ON_SUSPEND |
> > + IRQCHIP_SET_TYPE_MASKED |
> > + IRQCHIP_SKIP_SET_WAKE,
> > +};
> > +
> > +static int rzg2l_irqc_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 spec;
> > + irq_hw_number_t hwirq;
> > + int tint = -EINVAL;
> > + unsigned int type;
> > + unsigned int i;
> > + int ret;
> > +
> > + ret = irq_domain_translate_twocell(domain, arg, &hwirq, &type);
> > + if (ret)
> > + return ret;
> > +
> > + /*
> > + * For TINIT interrupts ie where pinctrl driver is child of irqc
>
> Minor pick. Typo TINIT->TINT?? Similarly, 2 other places below.
>
Oops will fix that.

Cheers,
Prabhakar