1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-loongson-pch-lpc.c b/drivers/irqchip/irq-loongson-pch-lpc.c
new file mode 100644
index 0000000000..9b35492fb6
--- /dev/null
+++ b/drivers/irqchip/irq-loongson-pch-lpc.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Loongson LPC Interrupt Controller support
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#define pr_fmt(fmt) "lpc: " fmt
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/syscore_ops.h>
+
+/* Registers */
+#define LPC_INT_CTL		0x00
+#define LPC_INT_ENA		0x04
+#define LPC_INT_STS		0x08
+#define LPC_INT_CLR		0x0c
+#define LPC_INT_POL		0x10
+#define LPC_COUNT		16
+
+/* LPC_INT_CTL */
+#define LPC_INT_CTL_EN		BIT(31)
+
+struct pch_lpc {
+	void __iomem		*base;
+	struct irq_domain	*lpc_domain;
+	raw_spinlock_t		lpc_lock;
+	u32			saved_reg_ctl;
+	u32			saved_reg_ena;
+	u32			saved_reg_pol;
+};
+
+static struct pch_lpc *pch_lpc_priv;
+struct fwnode_handle *pch_lpc_handle;
+
+static void lpc_irq_ack(struct irq_data *d)
+{
+	unsigned long flags;
+	struct pch_lpc *priv = d->domain->host_data;
+
+	raw_spin_lock_irqsave(&priv->lpc_lock, flags);
+	writel(0x1 << d->hwirq, priv->base + LPC_INT_CLR);
+	raw_spin_unlock_irqrestore(&priv->lpc_lock, flags);
+}
+
+static void lpc_irq_mask(struct irq_data *d)
+{
+	unsigned long flags;
+	struct pch_lpc *priv = d->domain->host_data;
+
+	raw_spin_lock_irqsave(&priv->lpc_lock, flags);
+	writel(readl(priv->base + LPC_INT_ENA) & (~(0x1 << (d->hwirq))),
+			priv->base + LPC_INT_ENA);
+	raw_spin_unlock_irqrestore(&priv->lpc_lock, flags);
+}
+
+static void lpc_irq_unmask(struct irq_data *d)
+{
+	unsigned long flags;
+	struct pch_lpc *priv = d->domain->host_data;
+
+	raw_spin_lock_irqsave(&priv->lpc_lock, flags);
+	writel(readl(priv->base + LPC_INT_ENA) | (0x1 << (d->hwirq)),
+			priv->base + LPC_INT_ENA);
+	raw_spin_unlock_irqrestore(&priv->lpc_lock, flags);
+}
+
+static int lpc_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	u32 val;
+	u32 mask = 0x1 << (d->hwirq);
+	struct pch_lpc *priv = d->domain->host_data;
+
+	if (!(type & IRQ_TYPE_LEVEL_MASK))
+		return 0;
+
+	val = readl(priv->base + LPC_INT_POL);
+
+	if (type == IRQ_TYPE_LEVEL_HIGH)
+		val |= mask;
+	else
+		val &= ~mask;
+
+	writel(val, priv->base + LPC_INT_POL);
+
+	return 0;
+}
+
+static const struct irq_chip pch_lpc_irq_chip = {
+	.name			= "PCH LPC",
+	.irq_mask		= lpc_irq_mask,
+	.irq_unmask		= lpc_irq_unmask,
+	.irq_ack		= lpc_irq_ack,
+	.irq_set_type		= lpc_irq_set_type,
+	.flags			= IRQCHIP_SKIP_SET_WAKE,
+};
+
+static void lpc_irq_dispatch(struct irq_desc *desc)
+{
+	u32 pending, bit;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct pch_lpc *priv = irq_desc_get_handler_data(desc);
+
+	chained_irq_enter(chip, desc);
+
+	pending = readl(priv->base + LPC_INT_ENA);
+	pending &= readl(priv->base + LPC_INT_STS);
+	if (!pending)
+		spurious_interrupt();
+
+	while (pending) {
+		bit = __ffs(pending);
+
+		generic_handle_domain_irq(priv->lpc_domain, bit);
+		pending &= ~BIT(bit);
+	}
+	chained_irq_exit(chip, desc);
+}
+
+static int pch_lpc_map(struct irq_domain *d, unsigned int irq,
+			irq_hw_number_t hw)
+{
+	irq_set_chip_and_handler(irq, &pch_lpc_irq_chip, handle_level_irq);
+	return 0;
+}
+
+static const struct irq_domain_ops pch_lpc_domain_ops = {
+	.map 		= pch_lpc_map,
+	.translate	= irq_domain_translate_twocell,
+};
+
+static void pch_lpc_reset(struct pch_lpc *priv)
+{
+	/* Enable the LPC interrupt, bit31: en  bit30: edge */
+	writel(LPC_INT_CTL_EN, priv->base + LPC_INT_CTL);
+	writel(0, priv->base + LPC_INT_ENA);
+	/* Clear all 18-bit interrpt bit */
+	writel(GENMASK(17, 0), priv->base + LPC_INT_CLR);
+}
+
+static int pch_lpc_disabled(struct pch_lpc *priv)
+{
+	return (readl(priv->base + LPC_INT_ENA) == 0xffffffff) &&
+			(readl(priv->base + LPC_INT_STS) == 0xffffffff);
+}
+
+static int pch_lpc_suspend(void)
+{
+	pch_lpc_priv->saved_reg_ctl = readl(pch_lpc_priv->base + LPC_INT_CTL);
+	pch_lpc_priv->saved_reg_ena = readl(pch_lpc_priv->base + LPC_INT_ENA);
+	pch_lpc_priv->saved_reg_pol = readl(pch_lpc_priv->base + LPC_INT_POL);
+	return 0;
+}
+
+static void pch_lpc_resume(void)
+{
+	writel(pch_lpc_priv->saved_reg_ctl, pch_lpc_priv->base + LPC_INT_CTL);
+	writel(pch_lpc_priv->saved_reg_ena, pch_lpc_priv->base + LPC_INT_ENA);
+	writel(pch_lpc_priv->saved_reg_pol, pch_lpc_priv->base + LPC_INT_POL);
+}
+
+static struct syscore_ops pch_lpc_syscore_ops = {
+	.suspend = pch_lpc_suspend,
+	.resume = pch_lpc_resume,
+};
+
+int __init pch_lpc_acpi_init(struct irq_domain *parent,
+					struct acpi_madt_lpc_pic *acpi_pchlpc)
+{
+	int parent_irq;
+	struct pch_lpc *priv;
+	struct irq_fwspec fwspec;
+	struct fwnode_handle *irq_handle;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	raw_spin_lock_init(&priv->lpc_lock);
+
+	priv->base = ioremap(acpi_pchlpc->address, acpi_pchlpc->size);
+	if (!priv->base)
+		goto free_priv;
+
+	if (pch_lpc_disabled(priv)) {
+		pr_err("Failed to get LPC status\n");
+		goto iounmap_base;
+	}
+
+	irq_handle = irq_domain_alloc_named_fwnode("lpcintc");
+	if (!irq_handle) {
+		pr_err("Unable to allocate domain handle\n");
+		goto iounmap_base;
+	}
+
+	priv->lpc_domain = irq_domain_create_linear(irq_handle, LPC_COUNT,
+					&pch_lpc_domain_ops, priv);
+	if (!priv->lpc_domain) {
+		pr_err("Failed to create IRQ domain\n");
+		goto free_irq_handle;
+	}
+	pch_lpc_reset(priv);
+
+	fwspec.fwnode = parent->fwnode;
+	fwspec.param[0] = acpi_pchlpc->cascade + GSI_MIN_PCH_IRQ;
+	fwspec.param[1] = IRQ_TYPE_LEVEL_HIGH;
+	fwspec.param_count = 2;
+	parent_irq = irq_create_fwspec_mapping(&fwspec);
+	irq_set_chained_handler_and_data(parent_irq, lpc_irq_dispatch, priv);
+
+	pch_lpc_priv = priv;
+	pch_lpc_handle = irq_handle;
+	register_syscore_ops(&pch_lpc_syscore_ops);
+
+	return 0;
+
+free_irq_handle:
+	irq_domain_free_fwnode(irq_handle);
+iounmap_base:
+	iounmap(priv->base);
+free_priv:
+	kfree(priv);
+
+	return -ENOMEM;
+}