diff mbox series

[v6,5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO interrupt

Message ID 20220625200600.7582-6-prabhakar.mahadev-lad.rj@bp.renesas.com
State Accepted
Commit db2e5f21a48edf1d1110d348add54bf22050643b
Headers show
Series Renesas RZ/G2L IRQC support | expand

Commit Message

Prabhakar Mahadev Lad June 25, 2022, 8:06 p.m. UTC 
Add IRQ domain to RZ/G2L pinctrl driver to handle GPIO interrupt.

GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
used as IRQ lines at a given time. Selection of pins as IRQ lines
is handled by IA55 (which is the IRQC block) which sits in between the
GPIO and GIC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 236 ++++++++++++++++++++++++
 1 file changed, 236 insertions(+)

Comments

Marc Zyngier June 29, 2022, 4:26 p.m. UTC | #1 
On Sat, 25 Jun 2022 21:06:00 +0100,
Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> 
> Add IRQ domain to RZ/G2L pinctrl driver to handle GPIO interrupt.
> 
> GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
> used as IRQ lines at a given time. Selection of pins as IRQ lines
> is handled by IA55 (which is the IRQC block) which sits in between the
> GPIO and GIC.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 236 ++++++++++++++++++++++++
>  1 file changed, 236 insertions(+)
>

[...]

> +static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
> +					       unsigned int parent_hwirq,
> +					       unsigned int parent_type)
> +{
> +	struct irq_fwspec *fwspec;
> +
> +	fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
> +	if (!fwspec)
> +		return NULL;
> +
> +	fwspec->fwnode = chip->irq.parent_domain->fwnode;
> +	fwspec->param_count = 2;
> +	fwspec->param[0] = parent_hwirq;
> +	fwspec->param[1] = parent_type;
> +
> +	return fwspec;
> +}

I jumped at this one again.

Can you please pick [1] as part of your series and write this in a way
that doesn't require extra memory allocation? It has already been
ack'ed by Linus anyway, and we'd put an end to this thing for good.

Thanks,

	M.

[1] https://lore.kernel.org/r/20220512162320.2213488-1-maz@kernel.org
Prabhakar June 30, 2022, 8:41 a.m. UTC | #2 
Hi Marc,

Thank you for the review.

On Wed, Jun 29, 2022 at 5:26 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On Sat, 25 Jun 2022 21:06:00 +0100,
> Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> >
> > Add IRQ domain to RZ/G2L pinctrl driver to handle GPIO interrupt.
> >
> > GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
> > used as IRQ lines at a given time. Selection of pins as IRQ lines
> > is handled by IA55 (which is the IRQC block) which sits in between the
> > GPIO and GIC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> >  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 236 ++++++++++++++++++++++++
> >  1 file changed, 236 insertions(+)
> >
>
> [...]
>
> > +static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
> > +                                            unsigned int parent_hwirq,
> > +                                            unsigned int parent_type)
> > +{
> > +     struct irq_fwspec *fwspec;
> > +
> > +     fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
> > +     if (!fwspec)
> > +             return NULL;
> > +
> > +     fwspec->fwnode = chip->irq.parent_domain->fwnode;
> > +     fwspec->param_count = 2;
> > +     fwspec->param[0] = parent_hwirq;
> > +     fwspec->param[1] = parent_type;
> > +
> > +     return fwspec;
> > +}
>
> I jumped at this one again.
>
> Can you please pick [1] as part of your series and write this in a way
> that doesn't require extra memory allocation? It has already been
> ack'ed by Linus anyway, and we'd put an end to this thing for good.
>
Sure will update and post a v7.

Cheers,
Prabhakar
Prabhakar July 1, 2022, 6:15 p.m. UTC | #3 
Hi Marc,

On Wed, Jun 29, 2022 at 5:26 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On Sat, 25 Jun 2022 21:06:00 +0100,
> Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> >
> > Add IRQ domain to RZ/G2L pinctrl driver to handle GPIO interrupt.
> >
> > GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
> > used as IRQ lines at a given time. Selection of pins as IRQ lines
> > is handled by IA55 (which is the IRQC block) which sits in between the
> > GPIO and GIC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> >  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 236 ++++++++++++++++++++++++
> >  1 file changed, 236 insertions(+)
> >
>
> [...]
>
> > +static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
> > +                                            unsigned int parent_hwirq,
> > +                                            unsigned int parent_type)
> > +{
> > +     struct irq_fwspec *fwspec;
> > +
> > +     fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
> > +     if (!fwspec)
> > +             return NULL;
> > +
> > +     fwspec->fwnode = chip->irq.parent_domain->fwnode;
> > +     fwspec->param_count = 2;
> > +     fwspec->param[0] = parent_hwirq;
> > +     fwspec->param[1] = parent_type;
> > +
> > +     return fwspec;
> > +}
>
> I jumped at this one again.
>
> Can you please pick [1] as part of your series and write this in a way
> that doesn't require extra memory allocation? It has already been
> ack'ed by Linus anyway, and we'd put an end to this thing for good.
>
> Thanks,
>
>         M.
>
> [1] https://lore.kernel.org/r/20220512162320.2213488-1-maz@kernel.org
>
I tried applying [1] on linux-next  (c4185b16aba7) and 5.19-rc4
(03c765b0e3b4) but this patch does not apply cleanly. Can you please
point me to the repo where this patch exists (or repo where the patch
applies cleanly)?

Cheers,
Prabhakar
Marc Zyngier July 1, 2022, 8 p.m. UTC | #4 
On Fri, 01 Jul 2022 19:15:41 +0100,
"Lad, Prabhakar" <prabhakar.csengg@gmail.com> wrote:
> 
> Hi Marc,
> 
> On Wed, Jun 29, 2022 at 5:26 PM Marc Zyngier <maz@kernel.org> wrote:
> >
> > On Sat, 25 Jun 2022 21:06:00 +0100,
> > Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > >
> > > Add IRQ domain to RZ/G2L pinctrl driver to handle GPIO interrupt.
> > >
> > > GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
> > > used as IRQ lines at a given time. Selection of pins as IRQ lines
> > > is handled by IA55 (which is the IRQC block) which sits in between the
> > > GPIO and GIC.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > >  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 236 ++++++++++++++++++++++++
> > >  1 file changed, 236 insertions(+)
> > >
> >
> > [...]
> >
> > > +static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
> > > +                                            unsigned int parent_hwirq,
> > > +                                            unsigned int parent_type)
> > > +{
> > > +     struct irq_fwspec *fwspec;
> > > +
> > > +     fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
> > > +     if (!fwspec)
> > > +             return NULL;
> > > +
> > > +     fwspec->fwnode = chip->irq.parent_domain->fwnode;
> > > +     fwspec->param_count = 2;
> > > +     fwspec->param[0] = parent_hwirq;
> > > +     fwspec->param[1] = parent_type;
> > > +
> > > +     return fwspec;
> > > +}
> >
> > I jumped at this one again.
> >
> > Can you please pick [1] as part of your series and write this in a way
> > that doesn't require extra memory allocation? It has already been
> > ack'ed by Linus anyway, and we'd put an end to this thing for good.
> >
> > Thanks,
> >
> >         M.
> >
> > [1] https://lore.kernel.org/r/20220512162320.2213488-1-maz@kernel.org
> >
> I tried applying [1] on linux-next  (c4185b16aba7) and 5.19-rc4
> (03c765b0e3b4) but this patch does not apply cleanly. Can you please
> point me to the repo where this patch exists (or repo where the patch
> applies cleanly)?

Odd, it applies cleanly here to -rc4. Anyway, I've now pushed it out
to [1] with Linus' RB and a typo fix in the commit message.

Thanks,

	M.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/gpio-fwspec-stack
diff mbox series

Patch

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index c3cdf52b7294..ea78f992a09f 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -9,8 +9,10 @@ 
 #include <linux/clk.h>
 #include <linux/gpio/driver.h>
 #include <linux/io.h>
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -89,6 +91,7 @@ 
 #define PIN(n)			(0x0800 + 0x10 + (n))
 #define IOLH(n)			(0x1000 + (n) * 8)
 #define IEN(n)			(0x1800 + (n) * 8)
+#define ISEL(n)			(0x2c80 + (n) * 8)
 #define PWPR			(0x3014)
 #define SD_CH(n)		(0x3000 + (n) * 4)
 #define QSPI			(0x3008)
@@ -112,6 +115,10 @@ 
 #define RZG2L_PIN_ID_TO_PORT_OFFSET(id)	(RZG2L_PIN_ID_TO_PORT(id) + 0x10)
 #define RZG2L_PIN_ID_TO_PIN(id)		((id) % RZG2L_PINS_PER_PORT)
 
+#define RZG2L_TINT_MAX_INTERRUPT	32
+#define RZG2L_TINT_IRQ_START_INDEX	9
+#define RZG2L_PACK_HWIRQ(t, i)		(((t) << 16) | (i))
+
 struct rzg2l_dedicated_configs {
 	const char *name;
 	u32 config;
@@ -137,6 +144,9 @@  struct rzg2l_pinctrl {
 
 	struct gpio_chip		gpio_chip;
 	struct pinctrl_gpio_range	gpio_range;
+	DECLARE_BITMAP(tint_slot, RZG2L_TINT_MAX_INTERRUPT);
+	spinlock_t			bitmap_lock;
+	unsigned int			hwirq[RZG2L_TINT_MAX_INTERRUPT];
 
 	spinlock_t			lock;
 };
@@ -885,8 +895,14 @@  static int rzg2l_gpio_get(struct gpio_chip *chip, unsigned int offset)
 
 static void rzg2l_gpio_free(struct gpio_chip *chip, unsigned int offset)
 {
+	unsigned int virq;
+
 	pinctrl_gpio_free(chip->base + offset);
 
+	virq = irq_find_mapping(chip->irq.domain, offset);
+	if (virq)
+		irq_dispose_mapping(virq);
+
 	/*
 	 * Set the GPIO as an input to ensure that the next GPIO request won't
 	 * drive the GPIO pin as an output.
@@ -1106,14 +1122,224 @@  static struct {
 	}
 };
 
+static int rzg2l_gpio_get_gpioint(unsigned int virq)
+{
+	unsigned int gpioint;
+	unsigned int i;
+	u32 port, bit;
+
+	port = virq / 8;
+	bit = virq % 8;
+
+	if (port >= ARRAY_SIZE(rzg2l_gpio_configs) ||
+	    bit >= RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[port]))
+		return -EINVAL;
+
+	gpioint = bit;
+	for (i = 0; i < port; i++)
+		gpioint += RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[i]);
+
+	return gpioint;
+}
+
+static void rzg2l_gpio_irq_disable(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip);
+	unsigned int hwirq = irqd_to_hwirq(d);
+	unsigned long flags;
+	void __iomem *addr;
+	u32 port;
+	u8 bit;
+
+	port = RZG2L_PIN_ID_TO_PORT(hwirq);
+	bit = RZG2L_PIN_ID_TO_PIN(hwirq);
+
+	addr = pctrl->base + ISEL(port);
+	if (bit >= 4) {
+		bit -= 4;
+		addr += 4;
+	}
+
+	spin_lock_irqsave(&pctrl->lock, flags);
+	writel(readl(addr) & ~BIT(bit * 8), addr);
+	spin_unlock_irqrestore(&pctrl->lock, flags);
+
+	gpiochip_disable_irq(gc, hwirq);
+	irq_chip_disable_parent(d);
+}
+
+static void rzg2l_gpio_irq_enable(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip);
+	unsigned int hwirq = irqd_to_hwirq(d);
+	unsigned long flags;
+	void __iomem *addr;
+	u32 port;
+	u8 bit;
+
+	gpiochip_enable_irq(gc, hwirq);
+
+	port = RZG2L_PIN_ID_TO_PORT(hwirq);
+	bit = RZG2L_PIN_ID_TO_PIN(hwirq);
+
+	addr = pctrl->base + ISEL(port);
+	if (bit >= 4) {
+		bit -= 4;
+		addr += 4;
+	}
+
+	spin_lock_irqsave(&pctrl->lock, flags);
+	writel(readl(addr) | BIT(bit * 8), addr);
+	spin_unlock_irqrestore(&pctrl->lock, flags);
+
+	irq_chip_enable_parent(d);
+}
+
+static int rzg2l_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	return irq_chip_set_type_parent(d, type);
+}
+
+static void rzg2l_gpio_irqc_eoi(struct irq_data *d)
+{
+	irq_chip_eoi_parent(d);
+}
+
+static void rzg2l_gpio_irq_print_chip(struct irq_data *data, struct seq_file *p)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+
+	seq_printf(p, dev_name(gc->parent));
+}
+
+static const struct irq_chip rzg2l_gpio_irqchip = {
+	.name = "rzg2l-gpio",
+	.irq_disable = rzg2l_gpio_irq_disable,
+	.irq_enable = rzg2l_gpio_irq_enable,
+	.irq_mask = irq_chip_mask_parent,
+	.irq_unmask = irq_chip_unmask_parent,
+	.irq_set_type = rzg2l_gpio_irq_set_type,
+	.irq_eoi = rzg2l_gpio_irqc_eoi,
+	.irq_print_chip = rzg2l_gpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
+					    unsigned int child,
+					    unsigned int child_type,
+					    unsigned int *parent,
+					    unsigned int *parent_type)
+{
+	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(gc);
+	unsigned long flags;
+	int gpioint, irq;
+
+	gpioint = rzg2l_gpio_get_gpioint(child);
+	if (gpioint < 0)
+		return gpioint;
+
+	spin_lock_irqsave(&pctrl->bitmap_lock, flags);
+	irq = bitmap_find_free_region(pctrl->tint_slot, RZG2L_TINT_MAX_INTERRUPT, get_order(1));
+	spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);
+	if (irq < 0)
+		return -ENOSPC;
+	pctrl->hwirq[irq] = child;
+	irq += RZG2L_TINT_IRQ_START_INDEX;
+
+	/* All these interrupts are level high in the CPU */
+	*parent_type = IRQ_TYPE_LEVEL_HIGH;
+	*parent = RZG2L_PACK_HWIRQ(gpioint, irq);
+	return 0;
+}
+
+static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
+					       unsigned int parent_hwirq,
+					       unsigned int parent_type)
+{
+	struct irq_fwspec *fwspec;
+
+	fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
+	if (!fwspec)
+		return NULL;
+
+	fwspec->fwnode = chip->irq.parent_domain->fwnode;
+	fwspec->param_count = 2;
+	fwspec->param[0] = parent_hwirq;
+	fwspec->param[1] = parent_type;
+
+	return fwspec;
+}
+
+static void rzg2l_gpio_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+				       unsigned int nr_irqs)
+{
+	struct irq_data *d;
+
+	d = irq_domain_get_irq_data(domain, virq);
+	if (d) {
+		struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+		struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip);
+		irq_hw_number_t hwirq = irqd_to_hwirq(d);
+		unsigned long flags;
+		unsigned int i;
+
+		for (i = 0; i < RZG2L_TINT_MAX_INTERRUPT; i++) {
+			if (pctrl->hwirq[i] == hwirq) {
+				spin_lock_irqsave(&pctrl->bitmap_lock, flags);
+				bitmap_release_region(pctrl->tint_slot, i, get_order(1));
+				spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);
+				pctrl->hwirq[i] = 0;
+				break;
+			}
+		}
+	}
+	irq_domain_free_irqs_common(domain, virq, nr_irqs);
+}
+
+static void rzg2l_init_irq_valid_mask(struct gpio_chip *gc,
+				      unsigned long *valid_mask,
+				      unsigned int ngpios)
+{
+	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(gc);
+	struct gpio_chip *chip = &pctrl->gpio_chip;
+	unsigned int offset;
+
+	/* Forbid unused lines to be mapped as IRQs */
+	for (offset = 0; offset < chip->ngpio; offset++) {
+		u32 port, bit;
+
+		port = offset / 8;
+		bit = offset % 8;
+
+		if (port >= ARRAY_SIZE(rzg2l_gpio_configs) ||
+		    bit >= RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[port]))
+			clear_bit(offset, valid_mask);
+	}
+}
+
 static int rzg2l_gpio_register(struct rzg2l_pinctrl *pctrl)
 {
 	struct device_node *np = pctrl->dev->of_node;
 	struct gpio_chip *chip = &pctrl->gpio_chip;
 	const char *name = dev_name(pctrl->dev);
+	struct irq_domain *parent_domain;
 	struct of_phandle_args of_args;
+	struct device_node *parent_np;
+	struct gpio_irq_chip *girq;
 	int ret;
 
+	parent_np = of_irq_find_parent(np);
+	if (!parent_np)
+		return -ENXIO;
+
+	parent_domain = irq_find_host(parent_np);
+	of_node_put(parent_np);
+	if (!parent_domain)
+		return -EPROBE_DEFER;
+
 	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &of_args);
 	if (ret) {
 		dev_err(pctrl->dev, "Unable to parse gpio-ranges\n");
@@ -1140,6 +1366,15 @@  static int rzg2l_gpio_register(struct rzg2l_pinctrl *pctrl)
 	chip->base = -1;
 	chip->ngpio = of_args.args[2];
 
+	girq = &chip->irq;
+	gpio_irq_chip_set_chip(girq, &rzg2l_gpio_irqchip);
+	girq->fwnode = of_node_to_fwnode(np);
+	girq->parent_domain = parent_domain;
+	girq->child_to_parent_hwirq = rzg2l_gpio_child_to_parent_hwirq;
+	girq->populate_parent_alloc_arg = rzg2l_gpio_populate_parent_fwspec;
+	girq->child_irq_domain_ops.free = rzg2l_gpio_irq_domain_free;
+	girq->init_valid_mask = rzg2l_init_irq_valid_mask;
+
 	pctrl->gpio_range.id = 0;
 	pctrl->gpio_range.pin_base = 0;
 	pctrl->gpio_range.base = 0;
@@ -1255,6 +1490,7 @@  static int rzg2l_pinctrl_probe(struct platform_device *pdev)
 	}
 
 	spin_lock_init(&pctrl->lock);
+	spin_lock_init(&pctrl->bitmap_lock);
 
 	platform_set_drvdata(pdev, pctrl);