1 files changed, 271 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
new file mode 100644
index 000000000..96f33ef1d
--- /dev/null
+++ b/arch/arm/mach-pxa/irq.c
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/arch/arm/mach-pxa/irq.c
+ *
+ *  Generic PXA IRQ handling
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Jun 15, 2001
+ *  Copyright:	MontaVista Software Inc.
+ */
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/syscore_ops.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/soc/pxa/cpu.h>
+
+#include <asm/exception.h>
+
+#include "irqs.h"
+
+#include "generic.h"
+#include "pxa-regs.h"
+
+#define ICIP			(0x000)
+#define ICMR			(0x004)
+#define ICLR			(0x008)
+#define ICFR			(0x00c)
+#define ICPR			(0x010)
+#define ICCR			(0x014)
+#define ICHP			(0x018)
+#define IPR(i)			(((i) < 32) ? (0x01c + ((i) << 2)) :		\
+				((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) :	\
+				      (0x144 + (((i) - 64) << 2)))
+#define ICHP_VAL_IRQ		(1 << 31)
+#define ICHP_IRQ(i)		(((i) >> 16) & 0x7fff)
+#define IPR_VALID		(1 << 31)
+
+#define MAX_INTERNAL_IRQS	128
+
+/*
+ * This is for peripheral IRQs internal to the PXA chip.
+ */
+
+static void __iomem *pxa_irq_base;
+static int pxa_internal_irq_nr;
+static bool cpu_has_ipr;
+static struct irq_domain *pxa_irq_domain;
+
+static inline void __iomem *irq_base(int i)
+{
+	static unsigned long phys_base_offset[] = {
+		0x0,
+		0x9c,
+		0x130,
+	};
+
+	return pxa_irq_base + phys_base_offset[i];
+}
+
+void pxa_mask_irq(struct irq_data *d)
+{
+	void __iomem *base = irq_data_get_irq_chip_data(d);
+	irq_hw_number_t irq = irqd_to_hwirq(d);
+	uint32_t icmr = __raw_readl(base + ICMR);
+
+	icmr &= ~BIT(irq & 0x1f);
+	__raw_writel(icmr, base + ICMR);
+}
+
+void pxa_unmask_irq(struct irq_data *d)
+{
+	void __iomem *base = irq_data_get_irq_chip_data(d);
+	irq_hw_number_t irq = irqd_to_hwirq(d);
+	uint32_t icmr = __raw_readl(base + ICMR);
+
+	icmr |= BIT(irq & 0x1f);
+	__raw_writel(icmr, base + ICMR);
+}
+
+static struct irq_chip pxa_internal_irq_chip = {
+	.name		= "SC",
+	.irq_ack	= pxa_mask_irq,
+	.irq_mask	= pxa_mask_irq,
+	.irq_unmask	= pxa_unmask_irq,
+};
+
+asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
+{
+	uint32_t icip, icmr, mask;
+
+	do {
+		icip = __raw_readl(pxa_irq_base + ICIP);
+		icmr = __raw_readl(pxa_irq_base + ICMR);
+		mask = icip & icmr;
+
+		if (mask == 0)
+			break;
+
+		handle_IRQ(PXA_IRQ(fls(mask) - 1), regs);
+	} while (1);
+}
+
+asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs)
+{
+	uint32_t ichp;
+
+	do {
+		__asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp));
+
+		if ((ichp & ICHP_VAL_IRQ) == 0)
+			break;
+
+		handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs);
+	} while (1);
+}
+
+static int pxa_irq_map(struct irq_domain *h, unsigned int virq,
+		       irq_hw_number_t hw)
+{
+	void __iomem *base = irq_base(hw / 32);
+
+	/* initialize interrupt priority */
+	if (cpu_has_ipr)
+		__raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw));
+
+	irq_set_chip_and_handler(virq, &pxa_internal_irq_chip,
+				 handle_level_irq);
+	irq_set_chip_data(virq, base);
+
+	return 0;
+}
+
+static const struct irq_domain_ops pxa_irq_ops = {
+	.map    = pxa_irq_map,
+	.xlate  = irq_domain_xlate_onecell,
+};
+
+static __init void
+pxa_init_irq_common(struct device_node *node, int irq_nr,
+		    int (*fn)(struct irq_data *, unsigned int))
+{
+	int n;
+
+	pxa_internal_irq_nr = irq_nr;
+	pxa_irq_domain = irq_domain_add_legacy(node, irq_nr,
+					       PXA_IRQ(0), 0,
+					       &pxa_irq_ops, NULL);
+	if (!pxa_irq_domain)
+		panic("Unable to add PXA IRQ domain\n");
+	irq_set_default_host(pxa_irq_domain);
+
+	for (n = 0; n < irq_nr; n += 32) {
+		void __iomem *base = irq_base(n >> 5);
+
+		__raw_writel(0, base + ICMR);	/* disable all IRQs */
+		__raw_writel(0, base + ICLR);	/* all IRQs are IRQ, not FIQ */
+	}
+	/* only unmasked interrupts kick us out of idle */
+	__raw_writel(1, irq_base(0) + ICCR);
+
+	pxa_internal_irq_chip.irq_set_wake = fn;
+}
+
+void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
+{
+	BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
+
+	pxa_irq_base = io_p2v(0x40d00000);
+	cpu_has_ipr = !cpu_is_pxa25x();
+	pxa_init_irq_common(NULL, irq_nr, fn);
+}
+
+#ifdef CONFIG_PM
+static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32];
+static unsigned long saved_ipr[MAX_INTERNAL_IRQS];
+
+static int pxa_irq_suspend(void)
+{
+	int i;
+
+	for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
+		void __iomem *base = irq_base(i);
+
+		saved_icmr[i] = __raw_readl(base + ICMR);
+		__raw_writel(0, base + ICMR);
+	}
+
+	if (cpu_has_ipr) {
+		for (i = 0; i < pxa_internal_irq_nr; i++)
+			saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i));
+	}
+
+	return 0;
+}
+
+static void pxa_irq_resume(void)
+{
+	int i;
+
+	for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
+		void __iomem *base = irq_base(i);
+
+		__raw_writel(saved_icmr[i], base + ICMR);
+		__raw_writel(0, base + ICLR);
+	}
+
+	if (cpu_has_ipr)
+		for (i = 0; i < pxa_internal_irq_nr; i++)
+			__raw_writel(saved_ipr[i], pxa_irq_base + IPR(i));
+
+	__raw_writel(1, pxa_irq_base + ICCR);
+}
+#else
+#define pxa_irq_suspend		NULL
+#define pxa_irq_resume		NULL
+#endif
+
+struct syscore_ops pxa_irq_syscore_ops = {
+	.suspend	= pxa_irq_suspend,
+	.resume		= pxa_irq_resume,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id intc_ids[] __initconst = {
+	{ .compatible = "marvell,pxa-intc", },
+	{}
+};
+
+void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int))
+{
+	struct device_node *node;
+	struct resource res;
+	int ret;
+
+	node = of_find_matching_node(NULL, intc_ids);
+	if (!node) {
+		pr_err("Failed to find interrupt controller in arch-pxa\n");
+		return;
+	}
+
+	ret = of_property_read_u32(node, "marvell,intc-nr-irqs",
+				   &pxa_internal_irq_nr);
+	if (ret) {
+		pr_err("Not found marvell,intc-nr-irqs property\n");
+		return;
+	}
+
+	ret = of_address_to_resource(node, 0, &res);
+	if (ret < 0) {
+		pr_err("No registers defined for node\n");
+		return;
+	}
+	pxa_irq_base = io_p2v(res.start);
+
+	if (of_find_property(node, "marvell,intc-priority", NULL))
+		cpu_has_ipr = 1;
+
+	ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0);
+	if (ret < 0) {
+		pr_err("Failed to allocate IRQ numbers\n");
+		return;
+	}
+
+	pxa_init_irq_common(node, pxa_internal_irq_nr, fn);
+}
+#endif /* CONFIG_OF */