summaryrefslogtreecommitdiffstats
path: root/drivers/irqchip/irq-loongson-htpic.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/irqchip/irq-loongson-htpic.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/irqchip/irq-loongson-htpic.c')
-rw-r--r--drivers/irqchip/irq-loongson-htpic.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-loongson-htpic.c b/drivers/irqchip/irq-loongson-htpic.c
new file mode 100644
index 000000000..f4abdf156
--- /dev/null
+++ b/drivers/irqchip/irq-loongson-htpic.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
+ * Loongson HTPIC IRQ support
+ */
+
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/syscore_ops.h>
+
+#include <asm/i8259.h>
+
+#define HTPIC_MAX_PARENT_IRQ 4
+#define HTINT_NUM_VECTORS 8
+#define HTINT_EN_OFF 0x20
+
+struct loongson_htpic {
+ void __iomem *base;
+ struct irq_domain *domain;
+};
+
+static struct loongson_htpic *htpic;
+
+static void htpic_irq_dispatch(struct irq_desc *desc)
+{
+ struct loongson_htpic *priv = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ uint32_t pending;
+
+ chained_irq_enter(chip, desc);
+ pending = readl(priv->base);
+ /* Ack all IRQs at once, otherwise IRQ flood might happen */
+ writel(pending, priv->base);
+
+ if (!pending)
+ spurious_interrupt();
+
+ while (pending) {
+ int bit = __ffs(pending);
+
+ if (unlikely(bit > 15)) {
+ spurious_interrupt();
+ break;
+ }
+
+ generic_handle_domain_irq(priv->domain, bit);
+ pending &= ~BIT(bit);
+ }
+ chained_irq_exit(chip, desc);
+}
+
+static void htpic_reg_init(void)
+{
+ int i;
+
+ for (i = 0; i < HTINT_NUM_VECTORS; i++) {
+ /* Disable all HT Vectors */
+ writel(0x0, htpic->base + HTINT_EN_OFF + i * 0x4);
+ /* Read back to force write */
+ (void) readl(htpic->base + i * 0x4);
+ /* Ack all possible pending IRQs */
+ writel(GENMASK(31, 0), htpic->base + i * 0x4);
+ }
+
+ /* Enable 16 vectors for PIC */
+ writel(0xffff, htpic->base + HTINT_EN_OFF);
+}
+
+static void htpic_resume(void)
+{
+ htpic_reg_init();
+}
+
+struct syscore_ops htpic_syscore_ops = {
+ .resume = htpic_resume,
+};
+
+static int __init htpic_of_init(struct device_node *node, struct device_node *parent)
+{
+ unsigned int parent_irq[4];
+ int i, err;
+ int num_parents = 0;
+
+ if (htpic) {
+ pr_err("loongson-htpic: Only one HTPIC is allowed in the system\n");
+ return -ENODEV;
+ }
+
+ htpic = kzalloc(sizeof(*htpic), GFP_KERNEL);
+ if (!htpic)
+ return -ENOMEM;
+
+ htpic->base = of_iomap(node, 0);
+ if (!htpic->base) {
+ err = -ENODEV;
+ goto out_free;
+ }
+
+ htpic->domain = __init_i8259_irqs(node);
+ if (!htpic->domain) {
+ pr_err("loongson-htpic: Failed to initialize i8259 IRQs\n");
+ err = -ENOMEM;
+ goto out_iounmap;
+ }
+
+ /* Interrupt may come from any of the 4 interrupt line */
+ for (i = 0; i < HTPIC_MAX_PARENT_IRQ; i++) {
+ parent_irq[i] = irq_of_parse_and_map(node, i);
+ if (parent_irq[i] <= 0)
+ break;
+
+ num_parents++;
+ }
+
+ if (!num_parents) {
+ pr_err("loongson-htpic: Failed to get parent irqs\n");
+ err = -ENODEV;
+ goto out_remove_domain;
+ }
+
+ htpic_reg_init();
+
+ for (i = 0; i < num_parents; i++) {
+ irq_set_chained_handler_and_data(parent_irq[i],
+ htpic_irq_dispatch, htpic);
+ }
+
+ register_syscore_ops(&htpic_syscore_ops);
+
+ return 0;
+
+out_remove_domain:
+ irq_domain_remove(htpic->domain);
+out_iounmap:
+ iounmap(htpic->base);
+out_free:
+ kfree(htpic);
+ return err;
+}
+
+IRQCHIP_DECLARE(loongson_htpic, "loongson,htpic-1.0", htpic_of_init);