Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-xtensa-mx.c b/drivers/irqchip/irq-xtensa-mx.c
new file mode 100644
index 0000000000..7f314e58f3
--- /dev/null
+++ b/drivers/irqchip/irq-xtensa-mx.c
@@ -0,0 +1,186 @@
+/*
+ * Xtensa MX interrupt distributor
+ *
+ * Copyright (C) 2002 - 2013 Tensilica, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/xtensa-mx.h>
+#include <linux/of.h>
+
+#include <asm/mxregs.h>
+
+#define HW_IRQ_IPI_COUNT 2
+#define HW_IRQ_MX_BASE 2
+#define HW_IRQ_EXTERN_BASE 3
+
+static DEFINE_PER_CPU(unsigned int, cached_irq_mask);
+
+static int xtensa_mx_irq_map(struct irq_domain *d, unsigned int irq,
+		irq_hw_number_t hw)
+{
+	if (hw < HW_IRQ_IPI_COUNT) {
+		struct irq_chip *irq_chip = d->host_data;
+		irq_set_chip_and_handler_name(irq, irq_chip,
+				handle_percpu_irq, "ipi");
+		irq_set_status_flags(irq, IRQ_LEVEL);
+		return 0;
+	}
+	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
+	return xtensa_irq_map(d, irq, hw);
+}
+
+/*
+ * Device Tree IRQ specifier translation function which works with one or
+ * two cell bindings. First cell value maps directly to the hwirq number.
+ * Second cell if present specifies whether hwirq number is external (1) or
+ * internal (0).
+ */
+static int xtensa_mx_irq_domain_xlate(struct irq_domain *d,
+		struct device_node *ctrlr,
+		const u32 *intspec, unsigned int intsize,
+		unsigned long *out_hwirq, unsigned int *out_type)
+{
+	return xtensa_irq_domain_xlate(intspec, intsize,
+			intspec[0], intspec[0] + HW_IRQ_EXTERN_BASE,
+			out_hwirq, out_type);
+}
+
+static const struct irq_domain_ops xtensa_mx_irq_domain_ops = {
+	.xlate = xtensa_mx_irq_domain_xlate,
+	.map = xtensa_mx_irq_map,
+};
+
+void secondary_init_irq(void)
+{
+	__this_cpu_write(cached_irq_mask,
+			XCHAL_INTTYPE_MASK_EXTERN_EDGE |
+			XCHAL_INTTYPE_MASK_EXTERN_LEVEL);
+	xtensa_set_sr(XCHAL_INTTYPE_MASK_EXTERN_EDGE |
+			XCHAL_INTTYPE_MASK_EXTERN_LEVEL, intenable);
+}
+
+static void xtensa_mx_irq_mask(struct irq_data *d)
+{
+	unsigned int mask = 1u << d->hwirq;
+
+	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
+		    XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
+		unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);
+
+		if (ext_irq >= HW_IRQ_MX_BASE) {
+			set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENG);
+			return;
+		}
+	}
+	mask = __this_cpu_read(cached_irq_mask) & ~mask;
+	__this_cpu_write(cached_irq_mask, mask);
+	xtensa_set_sr(mask, intenable);
+}
+
+static void xtensa_mx_irq_unmask(struct irq_data *d)
+{
+	unsigned int mask = 1u << d->hwirq;
+
+	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
+		    XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
+		unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);
+
+		if (ext_irq >= HW_IRQ_MX_BASE) {
+			set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENGSET);
+			return;
+		}
+	}
+	mask |= __this_cpu_read(cached_irq_mask);
+	__this_cpu_write(cached_irq_mask, mask);
+	xtensa_set_sr(mask, intenable);
+}
+
+static void xtensa_mx_irq_enable(struct irq_data *d)
+{
+	xtensa_mx_irq_unmask(d);
+}
+
+static void xtensa_mx_irq_disable(struct irq_data *d)
+{
+	xtensa_mx_irq_mask(d);
+}
+
+static void xtensa_mx_irq_ack(struct irq_data *d)
+{
+	xtensa_set_sr(1 << d->hwirq, intclear);
+}
+
+static int xtensa_mx_irq_retrigger(struct irq_data *d)
+{
+	unsigned int mask = 1u << d->hwirq;
+
+	if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
+		return 0;
+	xtensa_set_sr(mask, intset);
+	return 1;
+}
+
+static int xtensa_mx_irq_set_affinity(struct irq_data *d,
+		const struct cpumask *dest, bool force)
+{
+	int cpu = cpumask_any_and(dest, cpu_online_mask);
+	unsigned mask = 1u << cpu;
+
+	set_er(mask, MIROUT(d->hwirq - HW_IRQ_MX_BASE));
+	irq_data_update_effective_affinity(d, cpumask_of(cpu));
+
+	return 0;
+
+}
+
+static struct irq_chip xtensa_mx_irq_chip = {
+	.name		= "xtensa-mx",
+	.irq_enable	= xtensa_mx_irq_enable,
+	.irq_disable	= xtensa_mx_irq_disable,
+	.irq_mask	= xtensa_mx_irq_mask,
+	.irq_unmask	= xtensa_mx_irq_unmask,
+	.irq_ack	= xtensa_mx_irq_ack,
+	.irq_retrigger	= xtensa_mx_irq_retrigger,
+	.irq_set_affinity = xtensa_mx_irq_set_affinity,
+};
+
+static void __init xtensa_mx_init_common(struct irq_domain *root_domain)
+{
+	unsigned int i;
+
+	irq_set_default_host(root_domain);
+	secondary_init_irq();
+
+	/* Initialize default IRQ routing to CPU 0 */
+	for (i = 0; i < XCHAL_NUM_EXTINTERRUPTS; ++i)
+		set_er(1, MIROUT(i));
+}
+
+int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent)
+{
+	struct irq_domain *root_domain =
+		irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
+				&xtensa_mx_irq_domain_ops,
+				&xtensa_mx_irq_chip);
+	xtensa_mx_init_common(root_domain);
+	return 0;
+}
+
+static int __init xtensa_mx_init(struct device_node *np,
+		struct device_node *interrupt_parent)
+{
+	struct irq_domain *root_domain =
+		irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops,
+				&xtensa_mx_irq_chip);
+	xtensa_mx_init_common(root_domain);
+	return 0;
+}
+IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init);