Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 365 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-bcm7120-l2.c b/drivers/irqchip/irq-bcm7120-l2.c
new file mode 100644
index 0000000000..1e9dab6e0d
--- /dev/null
+++ b/drivers/irqchip/irq-bcm7120-l2.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Broadcom BCM7120 style Level 2 interrupt controller driver
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME	": " fmt
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/irqdomain.h>
+#include <linux/reboot.h>
+#include <linux/bitops.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+
+/* Register offset in the L2 interrupt controller */
+#define IRQEN		0x00
+#define IRQSTAT		0x04
+
+#define MAX_WORDS	4
+#define MAX_MAPPINGS	(MAX_WORDS * 2)
+#define IRQS_PER_WORD	32
+
+struct bcm7120_l1_intc_data {
+	struct bcm7120_l2_intc_data *b;
+	u32 irq_map_mask[MAX_WORDS];
+};
+
+struct bcm7120_l2_intc_data {
+	unsigned int n_words;
+	void __iomem *map_base[MAX_MAPPINGS];
+	void __iomem *pair_base[MAX_WORDS];
+	int en_offset[MAX_WORDS];
+	int stat_offset[MAX_WORDS];
+	struct irq_domain *domain;
+	bool can_wake;
+	u32 irq_fwd_mask[MAX_WORDS];
+	struct bcm7120_l1_intc_data *l1_data;
+	int num_parent_irqs;
+	const __be32 *map_mask_prop;
+};
+
+static void bcm7120_l2_intc_irq_handle(struct irq_desc *desc)
+{
+	struct bcm7120_l1_intc_data *data = irq_desc_get_handler_data(desc);
+	struct bcm7120_l2_intc_data *b = data->b;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	unsigned int idx;
+
+	chained_irq_enter(chip, desc);
+
+	for (idx = 0; idx < b->n_words; idx++) {
+		int base = idx * IRQS_PER_WORD;
+		struct irq_chip_generic *gc =
+			irq_get_domain_generic_chip(b->domain, base);
+		unsigned long pending;
+		int hwirq;
+
+		irq_gc_lock(gc);
+		pending = irq_reg_readl(gc, b->stat_offset[idx]) &
+					    gc->mask_cache &
+					    data->irq_map_mask[idx];
+		irq_gc_unlock(gc);
+
+		for_each_set_bit(hwirq, &pending, IRQS_PER_WORD)
+			generic_handle_domain_irq(b->domain, base + hwirq);
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm7120_l2_intc_suspend(struct irq_chip_generic *gc)
+{
+	struct bcm7120_l2_intc_data *b = gc->private;
+	struct irq_chip_type *ct = gc->chip_types;
+
+	irq_gc_lock(gc);
+	if (b->can_wake)
+		irq_reg_writel(gc, gc->mask_cache | gc->wake_active,
+			       ct->regs.mask);
+	irq_gc_unlock(gc);
+}
+
+static void bcm7120_l2_intc_resume(struct irq_chip_generic *gc)
+{
+	struct irq_chip_type *ct = gc->chip_types;
+
+	/* Restore the saved mask */
+	irq_gc_lock(gc);
+	irq_reg_writel(gc, gc->mask_cache, ct->regs.mask);
+	irq_gc_unlock(gc);
+}
+
+static int bcm7120_l2_intc_init_one(struct device_node *dn,
+					struct bcm7120_l2_intc_data *data,
+					int irq, u32 *valid_mask)
+{
+	struct bcm7120_l1_intc_data *l1_data = &data->l1_data[irq];
+	int parent_irq;
+	unsigned int idx;
+
+	parent_irq = irq_of_parse_and_map(dn, irq);
+	if (!parent_irq) {
+		pr_err("failed to map interrupt %d\n", irq);
+		return -EINVAL;
+	}
+
+	/* For multiple parent IRQs with multiple words, this looks like:
+	 * <irq0_w0 irq0_w1 irq1_w0 irq1_w1 ...>
+	 *
+	 * We need to associate a given parent interrupt with its corresponding
+	 * map_mask in order to mask the status register with it because we
+	 * have the same handler being called for multiple parent interrupts.
+	 *
+	 * This is typically something needed on BCM7xxx (STB chips).
+	 */
+	for (idx = 0; idx < data->n_words; idx++) {
+		if (data->map_mask_prop) {
+			l1_data->irq_map_mask[idx] |=
+				be32_to_cpup(data->map_mask_prop +
+					     irq * data->n_words + idx);
+		} else {
+			l1_data->irq_map_mask[idx] = 0xffffffff;
+		}
+		valid_mask[idx] |= l1_data->irq_map_mask[idx];
+	}
+
+	l1_data->b = data;
+
+	irq_set_chained_handler_and_data(parent_irq,
+					 bcm7120_l2_intc_irq_handle, l1_data);
+	if (data->can_wake)
+		enable_irq_wake(parent_irq);
+
+	return 0;
+}
+
+static int __init bcm7120_l2_intc_iomap_7120(struct device_node *dn,
+					     struct bcm7120_l2_intc_data *data)
+{
+	int ret;
+
+	data->map_base[0] = of_iomap(dn, 0);
+	if (!data->map_base[0]) {
+		pr_err("unable to map registers\n");
+		return -ENOMEM;
+	}
+
+	data->pair_base[0] = data->map_base[0];
+	data->en_offset[0] = IRQEN;
+	data->stat_offset[0] = IRQSTAT;
+	data->n_words = 1;
+
+	ret = of_property_read_u32_array(dn, "brcm,int-fwd-mask",
+					 data->irq_fwd_mask, data->n_words);
+	if (ret != 0 && ret != -EINVAL) {
+		/* property exists but has the wrong number of words */
+		pr_err("invalid brcm,int-fwd-mask property\n");
+		return -EINVAL;
+	}
+
+	data->map_mask_prop = of_get_property(dn, "brcm,int-map-mask", &ret);
+	if (!data->map_mask_prop ||
+	    (ret != (sizeof(__be32) * data->num_parent_irqs * data->n_words))) {
+		pr_err("invalid brcm,int-map-mask property\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int __init bcm7120_l2_intc_iomap_3380(struct device_node *dn,
+					     struct bcm7120_l2_intc_data *data)
+{
+	unsigned int gc_idx;
+
+	for (gc_idx = 0; gc_idx < MAX_WORDS; gc_idx++) {
+		unsigned int map_idx = gc_idx * 2;
+		void __iomem *en = of_iomap(dn, map_idx + 0);
+		void __iomem *stat = of_iomap(dn, map_idx + 1);
+		void __iomem *base = min(en, stat);
+
+		data->map_base[map_idx + 0] = en;
+		data->map_base[map_idx + 1] = stat;
+
+		if (!base)
+			break;
+
+		data->pair_base[gc_idx] = base;
+		data->en_offset[gc_idx] = en - base;
+		data->stat_offset[gc_idx] = stat - base;
+	}
+
+	if (!gc_idx) {
+		pr_err("unable to map registers\n");
+		return -EINVAL;
+	}
+
+	data->n_words = gc_idx;
+	return 0;
+}
+
+static int __init bcm7120_l2_intc_probe(struct device_node *dn,
+				 struct device_node *parent,
+				 int (*iomap_regs_fn)(struct device_node *,
+					struct bcm7120_l2_intc_data *),
+				 const char *intc_name)
+{
+	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+	struct bcm7120_l2_intc_data *data;
+	struct platform_device *pdev;
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	int ret = 0;
+	unsigned int idx, irq, flags;
+	u32 valid_mask[MAX_WORDS] = { };
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	pdev = of_find_device_by_node(dn);
+	if (!pdev) {
+		ret = -ENODEV;
+		goto out_free_data;
+	}
+
+	data->num_parent_irqs = platform_irq_count(pdev);
+	put_device(&pdev->dev);
+	if (data->num_parent_irqs <= 0) {
+		pr_err("invalid number of parent interrupts\n");
+		ret = -ENOMEM;
+		goto out_unmap;
+	}
+
+	data->l1_data = kcalloc(data->num_parent_irqs, sizeof(*data->l1_data),
+				GFP_KERNEL);
+	if (!data->l1_data) {
+		ret = -ENOMEM;
+		goto out_free_l1_data;
+	}
+
+	ret = iomap_regs_fn(dn, data);
+	if (ret < 0)
+		goto out_free_l1_data;
+
+	data->can_wake = of_property_read_bool(dn, "brcm,irq-can-wake");
+
+	for (irq = 0; irq < data->num_parent_irqs; irq++) {
+		ret = bcm7120_l2_intc_init_one(dn, data, irq, valid_mask);
+		if (ret)
+			goto out_free_l1_data;
+	}
+
+	data->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * data->n_words,
+					     &irq_generic_chip_ops, NULL);
+	if (!data->domain) {
+		ret = -ENOMEM;
+		goto out_free_l1_data;
+	}
+
+	/* MIPS chips strapped for BE will automagically configure the
+	 * peripheral registers for CPU-native byte order.
+	 */
+	flags = IRQ_GC_INIT_MASK_CACHE;
+	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		flags |= IRQ_GC_BE_IO;
+
+	ret = irq_alloc_domain_generic_chips(data->domain, IRQS_PER_WORD, 1,
+				dn->full_name, handle_level_irq, clr,
+				IRQ_LEVEL, flags);
+	if (ret) {
+		pr_err("failed to allocate generic irq chip\n");
+		goto out_free_domain;
+	}
+
+	for (idx = 0; idx < data->n_words; idx++) {
+		irq = idx * IRQS_PER_WORD;
+		gc = irq_get_domain_generic_chip(data->domain, irq);
+
+		gc->unused = 0xffffffff & ~valid_mask[idx];
+		gc->private = data;
+		ct = gc->chip_types;
+
+		gc->reg_base = data->pair_base[idx];
+		ct->regs.mask = data->en_offset[idx];
+
+		/* gc->reg_base is defined and so is gc->writel */
+		irq_reg_writel(gc, data->irq_fwd_mask[idx],
+			       data->en_offset[idx]);
+
+		ct->chip.irq_mask = irq_gc_mask_clr_bit;
+		ct->chip.irq_unmask = irq_gc_mask_set_bit;
+		ct->chip.irq_ack = irq_gc_noop;
+		gc->suspend = bcm7120_l2_intc_suspend;
+		gc->resume = bcm7120_l2_intc_resume;
+
+		/*
+		 * Initialize mask-cache, in case we need it for
+		 * saving/restoring fwd mask even w/o any child interrupts
+		 * installed
+		 */
+		gc->mask_cache = irq_reg_readl(gc, ct->regs.mask);
+
+		if (data->can_wake) {
+			/* This IRQ chip can wake the system, set all
+			 * relevant child interrupts in wake_enabled mask
+			 */
+			gc->wake_enabled = 0xffffffff;
+			gc->wake_enabled &= ~gc->unused;
+			ct->chip.irq_set_wake = irq_gc_set_wake;
+		}
+	}
+
+	pr_info("registered %s intc (%pOF, parent IRQ(s): %d)\n",
+		intc_name, dn, data->num_parent_irqs);
+
+	return 0;
+
+out_free_domain:
+	irq_domain_remove(data->domain);
+out_free_l1_data:
+	kfree(data->l1_data);
+out_unmap:
+	for (idx = 0; idx < MAX_MAPPINGS; idx++) {
+		if (data->map_base[idx])
+			iounmap(data->map_base[idx]);
+	}
+out_free_data:
+	kfree(data);
+	return ret;
+}
+
+static int __init bcm7120_l2_intc_probe_7120(struct device_node *dn,
+					     struct device_node *parent)
+{
+	return bcm7120_l2_intc_probe(dn, parent, bcm7120_l2_intc_iomap_7120,
+				     "BCM7120 L2");
+}
+
+static int __init bcm7120_l2_intc_probe_3380(struct device_node *dn,
+					     struct device_node *parent)
+{
+	return bcm7120_l2_intc_probe(dn, parent, bcm7120_l2_intc_iomap_3380,
+				     "BCM3380 L2");
+}
+
+IRQCHIP_PLATFORM_DRIVER_BEGIN(bcm7120_l2)
+IRQCHIP_MATCH("brcm,bcm7120-l2-intc", bcm7120_l2_intc_probe_7120)
+IRQCHIP_MATCH("brcm,bcm3380-l2-intc", bcm7120_l2_intc_probe_3380)
+IRQCHIP_PLATFORM_DRIVER_END(bcm7120_l2)
+MODULE_DESCRIPTION("Broadcom STB 7120-style L2 interrupt controller driver");
+MODULE_LICENSE("GPL v2");