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path: root/drivers/irqchip/irq-ingenic-tcu.c
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Diffstat (limited to 'drivers/irqchip/irq-ingenic-tcu.c')
-rw-r--r--drivers/irqchip/irq-ingenic-tcu.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-ingenic-tcu.c b/drivers/irqchip/irq-ingenic-tcu.c
new file mode 100644
index 000000000000..6d05cefe9d79
--- /dev/null
+++ b/drivers/irqchip/irq-ingenic-tcu.c
@@ -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);