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Date: Thu, 11 Jan 2018 15:38:42 +0000
From: Marc Zyngier <marc.zyngier@....com>
To: Paul Cercueil <paul@...pouillou.net>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...eaurora.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Lee Jones <lee.jones@...aro.org>
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/9] irqchip: Add the ingenic-tcu-intc driver
On 10/01/18 22:48, Paul Cercueil wrote:
> This simple driver handles the IRQ chip of the TCU
> (Timer Counter Unit) of the JZ47xx Ingenic SoCs.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> drivers/irqchip/Kconfig | 6 ++
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-ingenic-tcu.c | 153 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 160 insertions(+)
> create mode 100644 drivers/irqchip/irq-ingenic-tcu.c
>
> v2: - Use SPDX identifier for the license
> - Make KConfig option select CONFIG_IRQ_DOMAIN since we depend on it
> v3: - Move documentation to its own patch
> - Add comment explaining why we only use IRQCHIP_DECLARE
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index c70476b34a53..74668f3605b0 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -267,6 +267,12 @@ config INGENIC_IRQ
> depends on MACH_INGENIC
> default y
>
> +config INGENIC_TCU_IRQ
> + bool
> + depends on MACH_INGENIC || COMPILE_TEST
> + select IRQ_DOMAIN
> + default y
> +
> config RENESAS_H8300H_INTC
> bool
> select IRQ_DOMAIN
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index d2df34a54d38..6effe0271cd6 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -70,6 +70,7 @@ obj-$(CONFIG_RENESAS_H8300H_INTC) += irq-renesas-h8300h.o
> obj-$(CONFIG_RENESAS_H8S_INTC) += irq-renesas-h8s.o
> obj-$(CONFIG_ARCH_SA1100) += irq-sa11x0.o
> obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o
> +obj-$(CONFIG_INGENIC_TCU_IRQ) += irq-ingenic-tcu.o
> obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o
> obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o
> obj-$(CONFIG_MVEBU_GICP) += irq-mvebu-gicp.o
> diff --git a/drivers/irqchip/irq-ingenic-tcu.c b/drivers/irqchip/irq-ingenic-tcu.c
> new file mode 100644
> index 000000000000..52e9688b31f6
> --- /dev/null
> +++ b/drivers/irqchip/irq-ingenic-tcu.c
> @@ -0,0 +1,153 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * JZ47xx SoCs TCU IRQ driver
> + * Copyright (C) 2018 Paul Cercueil <paul@...pouillou.net>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/irqchip.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/mfd/syscon/ingenic-tcu.h>
> +
> +static void ingenic_tcu_intc_cascade(struct irq_desc *desc)
> +{
> + struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
> + struct irq_domain *domain = irq_desc_get_handler_data(desc);
> + struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
> + struct regmap *map = gc->private;
> + uint32_t irq_reg, irq_mask;
> + unsigned int i;
> +
> + regmap_read(map, TCU_REG_TFR, &irq_reg);
> + regmap_read(map, TCU_REG_TMR, &irq_mask);
> +
> + chained_irq_enter(irq_chip, desc);
> +
> + irq_reg &= ~irq_mask;
> +
> + for (i = 0; i < 32; i++) {
> + if (irq_reg & BIT(i))
> + generic_handle_irq(irq_linear_revmap(domain, i));
> + }
> +
> + chained_irq_exit(irq_chip, desc);
> +}
> +
> +static void ingenic_tcu_gc_unmask_enable_reg(struct irq_data *d)
> +{
> + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> + struct irq_chip_type *ct = irq_data_get_chip_type(d);
> + struct regmap *map = gc->private;
> + u32 mask = d->mask;
> +
> + irq_gc_lock(gc);
> + regmap_write(map, ct->regs.ack, mask);
> + regmap_write(map, ct->regs.enable, mask);
> + *ct->mask_cache |= mask;
> + irq_gc_unlock(gc);
> +}
> +
> +static void ingenic_tcu_gc_mask_disable_reg(struct irq_data *d)
> +{
> + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> + struct irq_chip_type *ct = irq_data_get_chip_type(d);
> + struct regmap *map = gc->private;
> + u32 mask = d->mask;
> +
> + irq_gc_lock(gc);
> + regmap_write(map, ct->regs.disable, mask);
> + *ct->mask_cache &= ~mask;
> + irq_gc_unlock(gc);
> +}
> +
> +static void ingenic_tcu_gc_mask_disable_reg_and_ack(struct irq_data *d)
> +{
> + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> + struct irq_chip_type *ct = irq_data_get_chip_type(d);
> + struct regmap *map = gc->private;
> + u32 mask = d->mask;
> +
> + irq_gc_lock(gc);
> + regmap_write(map, ct->regs.ack, mask);
> + regmap_write(map, ct->regs.disable, mask);
> + irq_gc_unlock(gc);
> +}
> +
> +static int __init ingenic_tcu_intc_of_init(struct device_node *node,
> + struct device_node *parent)
> +{
> + struct irq_domain *domain;
> + struct irq_chip_generic *gc;
> + struct irq_chip_type *ct;
> + int err, i, num_parent_irqs;
> + unsigned int parent_irqs[3];
3 parent interrupts? Really? How do you pick one? Also, given the useage
model below, "int" is the wrong type. Probably should be u32.
> + struct regmap *map;
> +
> + num_parent_irqs = of_property_count_elems_of_size(
> + node, "interrupts", 4);
Nit: on a single line, as here is nothing that hurts my eyes more than
reading something like(
this). Also, 4 is better expressed as sizeof(u32).
> + if (num_parent_irqs < 0 || num_parent_irqs > ARRAY_SIZE(parent_irqs))
> + return -EINVAL;
> +
> + map = syscon_node_to_regmap(node->parent);
> + if (IS_ERR(map))
> + return PTR_ERR(map);
> +
> + domain = irq_domain_add_linear(node, 32, &irq_generic_chip_ops, NULL);
> + if (!domain)
> + return -ENOMEM;
> +
> + err = irq_alloc_domain_generic_chips(domain, 32, 1, "TCU",
> + handle_level_irq, 0, IRQ_NOPROBE | IRQ_LEVEL, 0);
> + if (err)
> + goto out_domain_remove;
> +
> + gc = irq_get_domain_generic_chip(domain, 0);
> + ct = gc->chip_types;
> +
> + gc->wake_enabled = IRQ_MSK(32);
> + gc->private = map;
> +
> + ct->regs.disable = TCU_REG_TMSR;
> + ct->regs.enable = TCU_REG_TMCR;
> + ct->regs.ack = TCU_REG_TFCR;
> + ct->chip.irq_unmask = ingenic_tcu_gc_unmask_enable_reg;
> + ct->chip.irq_mask = ingenic_tcu_gc_mask_disable_reg;
> + ct->chip.irq_mask_ack = ingenic_tcu_gc_mask_disable_reg_and_ack;
> + ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
> +
> + /* Mask all IRQs by default */
> + regmap_write(map, TCU_REG_TMSR, IRQ_MSK(32));
> +
> + for (i = 0; i < num_parent_irqs; i++) {
> + parent_irqs[i] = irq_of_parse_and_map(node, i);
> + if (!parent_irqs[i]) {
> + err = -EINVAL;
> + goto out_unmap_irqs;
> + }
> +
> + irq_set_chained_handler_and_data(parent_irqs[i],
> + ingenic_tcu_intc_cascade, domain);
> + }
I don't get the multiple parent irq at all. How are the source interrupt
routed to the various cascades?
> +
> + return 0;
> +
> +out_unmap_irqs:
> + for (; i > 0; i--)
> + irq_dispose_mapping(parent_irqs[i - 1]);
> +out_domain_remove:
> + irq_domain_remove(domain);
> + return err;
> +}
> +
> +/* We only probe via devicetree, no need for a platform driver */
> +IRQCHIP_DECLARE(jz4740_tcu_intc, "ingenic,jz4740-tcu-intc",
> + ingenic_tcu_intc_of_init);
> +IRQCHIP_DECLARE(jz4770_tcu_intc, "ingenic,jz4770-tcu-intc",
> + ingenic_tcu_intc_of_init);
> +IRQCHIP_DECLARE(jz4780_tcu_intc, "ingenic,jz4780-tcu-intc",
> + ingenic_tcu_intc_of_init);
>
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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