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path: root/drivers/irqchip/irq-mscc-ocelot.c
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Diffstat (limited to 'drivers/irqchip/irq-mscc-ocelot.c')
-rw-r--r--drivers/irqchip/irq-mscc-ocelot.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mscc-ocelot.c b/drivers/irqchip/irq-mscc-ocelot.c
new file mode 100644
index 000000000..4d0c3532d
--- /dev/null
+++ b/drivers/irqchip/irq-mscc-ocelot.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi Ocelot IRQ controller driver
+ *
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/interrupt.h>
+
+#define ICPU_CFG_INTR_DST_INTR_IDENT(_p, x) ((_p)->reg_off_ident + 0x4 * (x))
+#define ICPU_CFG_INTR_INTR_TRIGGER(_p, x) ((_p)->reg_off_trigger + 0x4 * (x))
+
+#define FLAGS_HAS_TRIGGER BIT(0)
+#define FLAGS_NEED_INIT_ENABLE BIT(1)
+
+struct chip_props {
+ u8 flags;
+ u8 reg_off_sticky;
+ u8 reg_off_ena;
+ u8 reg_off_ena_clr;
+ u8 reg_off_ena_set;
+ u8 reg_off_ident;
+ u8 reg_off_trigger;
+ u8 reg_off_ena_irq0;
+ u8 n_irq;
+};
+
+static struct chip_props ocelot_props = {
+ .flags = FLAGS_HAS_TRIGGER,
+ .reg_off_sticky = 0x10,
+ .reg_off_ena = 0x18,
+ .reg_off_ena_clr = 0x1c,
+ .reg_off_ena_set = 0x20,
+ .reg_off_ident = 0x38,
+ .reg_off_trigger = 0x5c,
+ .n_irq = 24,
+};
+
+static struct chip_props serval_props = {
+ .flags = FLAGS_HAS_TRIGGER,
+ .reg_off_sticky = 0xc,
+ .reg_off_ena = 0x14,
+ .reg_off_ena_clr = 0x18,
+ .reg_off_ena_set = 0x1c,
+ .reg_off_ident = 0x20,
+ .reg_off_trigger = 0x4,
+ .n_irq = 24,
+};
+
+static struct chip_props luton_props = {
+ .flags = FLAGS_NEED_INIT_ENABLE,
+ .reg_off_sticky = 0,
+ .reg_off_ena = 0x4,
+ .reg_off_ena_clr = 0x8,
+ .reg_off_ena_set = 0xc,
+ .reg_off_ident = 0x18,
+ .reg_off_ena_irq0 = 0x14,
+ .n_irq = 28,
+};
+
+static struct chip_props jaguar2_props = {
+ .flags = FLAGS_HAS_TRIGGER,
+ .reg_off_sticky = 0x10,
+ .reg_off_ena = 0x18,
+ .reg_off_ena_clr = 0x1c,
+ .reg_off_ena_set = 0x20,
+ .reg_off_ident = 0x38,
+ .reg_off_trigger = 0x5c,
+ .n_irq = 29,
+};
+
+static void ocelot_irq_unmask(struct irq_data *data)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
+ struct irq_domain *d = data->domain;
+ struct chip_props *p = d->host_data;
+ struct irq_chip_type *ct = irq_data_get_chip_type(data);
+ unsigned int mask = data->mask;
+ u32 val;
+
+ irq_gc_lock(gc);
+ val = irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 0)) |
+ irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 1));
+ if (!(val & mask))
+ irq_reg_writel(gc, mask, p->reg_off_sticky);
+
+ *ct->mask_cache &= ~mask;
+ irq_reg_writel(gc, mask, p->reg_off_ena_set);
+ irq_gc_unlock(gc);
+}
+
+static void ocelot_irq_handler(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct irq_domain *d = irq_desc_get_handler_data(desc);
+ struct chip_props *p = d->host_data;
+ struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
+ u32 reg = irq_reg_readl(gc, ICPU_CFG_INTR_DST_INTR_IDENT(p, 0));
+
+ chained_irq_enter(chip, desc);
+
+ while (reg) {
+ u32 hwirq = __fls(reg);
+
+ generic_handle_domain_irq(d, hwirq);
+ reg &= ~(BIT(hwirq));
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static int __init vcoreiii_irq_init(struct device_node *node,
+ struct device_node *parent,
+ struct chip_props *p)
+{
+ struct irq_domain *domain;
+ struct irq_chip_generic *gc;
+ int parent_irq, ret;
+
+ parent_irq = irq_of_parse_and_map(node, 0);
+ if (!parent_irq)
+ return -EINVAL;
+
+ domain = irq_domain_add_linear(node, p->n_irq,
+ &irq_generic_chip_ops, NULL);
+ if (!domain) {
+ pr_err("%pOFn: unable to add irq domain\n", node);
+ return -ENOMEM;
+ }
+
+ ret = irq_alloc_domain_generic_chips(domain, p->n_irq, 1,
+ "icpu", handle_level_irq,
+ 0, 0, 0);
+ if (ret) {
+ pr_err("%pOFn: unable to alloc irq domain gc\n", node);
+ goto err_domain_remove;
+ }
+
+ gc = irq_get_domain_generic_chip(domain, 0);
+ gc->reg_base = of_iomap(node, 0);
+ if (!gc->reg_base) {
+ pr_err("%pOFn: unable to map resource\n", node);
+ ret = -ENOMEM;
+ goto err_gc_free;
+ }
+
+ gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
+ gc->chip_types[0].regs.ack = p->reg_off_sticky;
+ if (p->flags & FLAGS_HAS_TRIGGER) {
+ gc->chip_types[0].regs.mask = p->reg_off_ena_clr;
+ gc->chip_types[0].chip.irq_unmask = ocelot_irq_unmask;
+ gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
+ } else {
+ gc->chip_types[0].regs.enable = p->reg_off_ena_set;
+ gc->chip_types[0].regs.disable = p->reg_off_ena_clr;
+ gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
+ gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
+ }
+
+ /* Mask and ack all interrupts */
+ irq_reg_writel(gc, 0, p->reg_off_ena);
+ irq_reg_writel(gc, 0xffffffff, p->reg_off_sticky);
+
+ /* Overall init */
+ if (p->flags & FLAGS_NEED_INIT_ENABLE)
+ irq_reg_writel(gc, BIT(0), p->reg_off_ena_irq0);
+
+ domain->host_data = p;
+ irq_set_chained_handler_and_data(parent_irq, ocelot_irq_handler,
+ domain);
+
+ return 0;
+
+err_gc_free:
+ irq_free_generic_chip(gc);
+
+err_domain_remove:
+ irq_domain_remove(domain);
+
+ return ret;
+}
+
+static int __init ocelot_irq_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return vcoreiii_irq_init(node, parent, &ocelot_props);
+}
+
+IRQCHIP_DECLARE(ocelot_icpu, "mscc,ocelot-icpu-intr", ocelot_irq_init);
+
+static int __init serval_irq_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return vcoreiii_irq_init(node, parent, &serval_props);
+}
+
+IRQCHIP_DECLARE(serval_icpu, "mscc,serval-icpu-intr", serval_irq_init);
+
+static int __init luton_irq_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return vcoreiii_irq_init(node, parent, &luton_props);
+}
+
+IRQCHIP_DECLARE(luton_icpu, "mscc,luton-icpu-intr", luton_irq_init);
+
+static int __init jaguar2_irq_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return vcoreiii_irq_init(node, parent, &jaguar2_props);
+}
+
+IRQCHIP_DECLARE(jaguar2_icpu, "mscc,jaguar2-icpu-intr", jaguar2_irq_init);