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// 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);
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