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irqchip: Add irq-ingenic-tcu driver

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This driver handles the interrupt controller built in the Timer/Counter
Unit (TCU) of the JZ47xx SoCs from Ingenic.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: od@zcrc.me
This commit is contained in:
Paul Cercueil 2019-07-24 13:16:08 -04:00 committed by Paul Burton
parent 4f89e4b8f1
commit 9536eba03e
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
3 changed files with 194 additions and 0 deletions
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11
drivers/irqchip/Kconfig
View File

@ -315,6 +315,17 @@ config INGENIC_IRQ
depends on MACH_INGENIC
default y
config INGENIC_TCU_IRQ
bool "Ingenic JZ47xx TCU interrupt controller"
default MACH_INGENIC
depends on MIPS || COMPILE_TEST
select MFD_SYSCON
help
Support for interrupts in the Timer/Counter Unit (TCU) of the Ingenic
JZ47xx SoCs.
If unsure, say N.
config RENESAS_H8300H_INTC
bool
select IRQ_DOMAIN

1
drivers/irqchip/Makefile
View File

@ -75,6 +75,7 @@ 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_MSCC_OCELOT_IRQ) += irq-mscc-ocelot.o

182
drivers/irqchip/irq-ingenic-tcu.c Normal file
View File

@ -0,0 +1,182 @@
// SPDX-License-Identifier: GPL-2.0
/*
* JZ47xx SoCs TCU IRQ driver
* Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/mfd/ingenic-tcu.h>
#include <linux/mfd/syscon.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
struct ingenic_tcu {
struct regmap *map;
struct clk *clk;
struct irq_domain *domain;
unsigned int nb_parent_irqs;
u32 parent_irqs[3];
};
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_each_set_bit(i, (unsigned long *)&irq_reg, 32)
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_irq_init(struct device_node *np,
struct device_node *parent)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
struct ingenic_tcu *tcu;
struct regmap *map;
unsigned int i;
int ret, irqs;
map = device_node_to_regmap(np);
if (IS_ERR(map))
return PTR_ERR(map);
tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
if (!tcu)
return -ENOMEM;
tcu->map = map;
irqs = of_property_count_elems_of_size(np, "interrupts", sizeof(u32));
if (irqs < 0 || irqs > ARRAY_SIZE(tcu->parent_irqs)) {
pr_crit("%s: Invalid 'interrupts' property\n", __func__);
ret = -EINVAL;
goto err_free_tcu;
}
tcu->nb_parent_irqs = irqs;
tcu->domain = irq_domain_add_linear(np, 32, &irq_generic_chip_ops,
NULL);
if (!tcu->domain) {
ret = -ENOMEM;
goto err_free_tcu;
}
ret = irq_alloc_domain_generic_chips(tcu->domain, 32, 1, "TCU",
handle_level_irq, 0,
IRQ_NOPROBE | IRQ_LEVEL, 0);
if (ret) {
pr_crit("%s: Invalid 'interrupts' property\n", __func__);
goto out_domain_remove;
}
gc = irq_get_domain_generic_chip(tcu->domain, 0);
ct = gc->chip_types;
gc->wake_enabled = IRQ_MSK(32);
gc->private = tcu->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(tcu->map, TCU_REG_TMSR, IRQ_MSK(32));
/*
* On JZ4740, timer 0 and timer 1 have their own interrupt line;
* timers 2-7 share one interrupt.
* On SoCs >= JZ4770, timer 5 has its own interrupt line;
* timers 0-4 and 6-7 share one single interrupt.
*
* To keep things simple, we just register the same handler to
* all parent interrupts. The handler will properly detect which
* channel fired the interrupt.
*/
for (i = 0; i < irqs; i++) {
tcu->parent_irqs[i] = irq_of_parse_and_map(np, i);
if (!tcu->parent_irqs[i]) {
ret = -EINVAL;
goto out_unmap_irqs;
}
irq_set_chained_handler_and_data(tcu->parent_irqs[i],
ingenic_tcu_intc_cascade,
tcu->domain);
}
return 0;
out_unmap_irqs:
for (; i > 0; i--)
irq_dispose_mapping(tcu->parent_irqs[i - 1]);
out_domain_remove:
irq_domain_remove(tcu->domain);
err_free_tcu:
kfree(tcu);
return ret;
}
IRQCHIP_DECLARE(jz4740_tcu_irq, "ingenic,jz4740-tcu", ingenic_tcu_irq_init);
IRQCHIP_DECLARE(jz4725b_tcu_irq, "ingenic,jz4725b-tcu", ingenic_tcu_irq_init);
IRQCHIP_DECLARE(jz4770_tcu_irq, "ingenic,jz4770-tcu", ingenic_tcu_irq_init);