Merge tag 'irq-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq subsystem updates from Ingo Molnar:

 - Add support for the IA55 interrupt controller on RZ/G3S SoC's

 - Update/fix the Qualcom MPM Interrupt Controller driver's register
   enumeration within the somewhat exotic "RPM Message RAM" MMIO-mapped
   shared memory region that is used for other purposes as well

 - Clean up the Xtensa built-in Programmable Interrupt Controller driver
   (xtensa-pic) a bit

* tag 'irq-core-2024-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/irq-xtensa-pic: Clean up
  irqchip/qcom-mpm: Support passing a slice of SRAM as reg space
  dt-bindings: interrupt-controller: mpm: Pass MSG RAM slice through phandle
  dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Document RZ/G3S
  irqchip/renesas-rzg2l: Add support for suspend to RAM
  irqchip/renesas-rzg2l: Add macro to retrieve TITSR register offset based on register's index
  irqchip/renesas-rzg2l: Implement restriction when writing ISCR register
  irqchip/renesas-rzg2l: Document structure members
  irqchip/renesas-rzg2l: Align struct member names to tabs
  irqchip/renesas-rzg2l: Use tabs instead of spaces

3 files changed, 118 insertions, 49 deletions

diff --git a/drivers/irqchip/irq-qcom-mpm.c b/drivers/irqchip/irq-qcom-mpm.c
index 7124565234a5..cda5838d2232 100644
--- a/drivers/irqchip/irq-qcom-mpm.c
+++ b/drivers/irqchip/irq-qcom-mpm.c
@@ -14,6 +14,7 @@
 #include <linux/mailbox_client.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
@@ -322,8 +323,10 @@ static int qcom_mpm_init(struct device_node *np, struct device_node *parent)
 	struct device *dev = &pdev->dev;
 	struct irq_domain *parent_domain;
 	struct generic_pm_domain *genpd;
+	struct device_node *msgram_np;
 	struct qcom_mpm_priv *priv;
 	unsigned int pin_cnt;
+	struct resource res;
 	int i, irq;
 	int ret;
 
@@ -374,9 +377,26 @@ static int qcom_mpm_init(struct device_node *np, struct device_node *parent)
 
 	raw_spin_lock_init(&priv->lock);
 
-	priv->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(priv->base))
-		return PTR_ERR(priv->base);
+	/* If we have a handle to an RPM message ram partition, use it. */
+	msgram_np = of_parse_phandle(np, "qcom,rpm-msg-ram", 0);
+	if (msgram_np) {
+		ret = of_address_to_resource(msgram_np, 0, &res);
+		if (ret) {
+			of_node_put(msgram_np);
+			return ret;
+		}
+
+		/* Don't use devm_ioremap_resource, as we're accessing a shared region. */
+		priv->base = devm_ioremap(dev, res.start, resource_size(&res));
+		of_node_put(msgram_np);
+		if (IS_ERR(priv->base))
+			return PTR_ERR(priv->base);
+	} else {
+		/* Otherwise, fall back to simple MMIO. */
+		priv->base = devm_platform_ioremap_resource(pdev, 0);
+		if (IS_ERR(priv->base))
+			return PTR_ERR(priv->base);
+	}
 
 	for (i = 0; i < priv->reg_stride; i++) {
 		qcom_mpm_write(priv, MPM_REG_ENABLE, i, 0);
diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index fe8d516f3614..9494fc26259c 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -18,6 +18,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/spinlock.h>
+#include <linux/syscore_ops.h>
 
 #define IRQC_IRQ_START			1
 #define IRQC_IRQ_COUNT			8
@@ -28,8 +29,7 @@
 #define ISCR				0x10
 #define IITSR				0x14
 #define TSCR				0x20
-#define TITSR0				0x24
-#define TITSR1				0x28
+#define TITSR(n)			(0x24 + (n) * 4)
 #define TITSR0_MAX_INT			16
 #define TITSEL_WIDTH			0x2
 #define TSSR(n)				(0x30 + ((n) * 4))
@@ -53,15 +53,33 @@
 #define IITSR_IITSEL_EDGE_BOTH		3
 #define IITSR_IITSEL_MASK(n)		IITSR_IITSEL((n), 3)
 
-#define TINT_EXTRACT_HWIRQ(x)           FIELD_GET(GENMASK(15, 0), (x))
-#define TINT_EXTRACT_GPIOINT(x)         FIELD_GET(GENMASK(31, 16), (x))
+#define TINT_EXTRACT_HWIRQ(x)		FIELD_GET(GENMASK(15, 0), (x))
+#define TINT_EXTRACT_GPIOINT(x)		FIELD_GET(GENMASK(31, 16), (x))
 
-struct rzg2l_irqc_priv {
-	void __iomem *base;
-	struct irq_fwspec fwspec[IRQC_NUM_IRQ];
-	raw_spinlock_t lock;
+/**
+ * struct rzg2l_irqc_reg_cache - registers cache (necessary for suspend/resume)
+ * @iitsr: IITSR register
+ * @titsr: TITSR registers
+ */
+struct rzg2l_irqc_reg_cache {
+	u32	iitsr;
+	u32	titsr[2];
 };
 
+/**
+ * struct rzg2l_irqc_priv - IRQ controller private data structure
+ * @base:	Controller's base address
+ * @fwspec:	IRQ firmware specific data
+ * @lock:	Lock to serialize access to hardware registers
+ * @cache:	Registers cache for suspend/resume
+ */
+static struct rzg2l_irqc_priv {
+	void __iomem			*base;
+	struct irq_fwspec		fwspec[IRQC_NUM_IRQ];
+	raw_spinlock_t			lock;
+	struct rzg2l_irqc_reg_cache	cache;
+} *rzg2l_irqc_data;
+
 static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data *data)
 {
 	return data->domain->host_data;
@@ -72,11 +90,17 @@ static void rzg2l_irq_eoi(struct irq_data *d)
 	unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
 	struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
 	u32 bit = BIT(hw_irq);
-	u32 reg;
+	u32 iitsr, iscr;
 
-	reg = readl_relaxed(priv->base + ISCR);
-	if (reg & bit)
-		writel_relaxed(reg & ~bit, priv->base + ISCR);
+	iscr = readl_relaxed(priv->base + ISCR);
+	iitsr = readl_relaxed(priv->base + IITSR);
+
+	/*
+	 * ISCR can only be cleared if the type is falling-edge, rising-edge or
+	 * falling/rising-edge.
+	 */
+	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
+		writel_relaxed(iscr & ~bit, priv->base + ISCR);
 }
 
 static void rzg2l_tint_eoi(struct irq_data *d)
@@ -188,8 +212,7 @@ static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type)
 	struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
 	unsigned int hwirq = irqd_to_hwirq(d);
 	u32 titseln = hwirq - IRQC_TINT_START;
-	u32 offset;
-	u8 sense;
+	u8 index, sense;
 	u32 reg;
 
 	switch (type & IRQ_TYPE_SENSE_MASK) {
@@ -205,17 +228,17 @@ static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type)
 		return -EINVAL;
 	}
 
-	offset = TITSR0;
+	index = 0;
 	if (titseln >= TITSR0_MAX_INT) {
 		titseln -= TITSR0_MAX_INT;
-		offset = TITSR1;
+		index = 1;
 	}
 
 	raw_spin_lock(&priv->lock);
-	reg = readl_relaxed(priv->base + offset);
+	reg = readl_relaxed(priv->base + TITSR(index));
 	reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
 	reg |= sense << (titseln * TITSEL_WIDTH);
-	writel_relaxed(reg, priv->base + offset);
+	writel_relaxed(reg, priv->base + TITSR(index));
 	raw_spin_unlock(&priv->lock);
 
 	return 0;
@@ -236,6 +259,38 @@ static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type)
 	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
 }
 
+static int rzg2l_irqc_irq_suspend(void)
+{
+	struct rzg2l_irqc_reg_cache *cache = &rzg2l_irqc_data->cache;
+	void __iomem *base = rzg2l_irqc_data->base;
+
+	cache->iitsr = readl_relaxed(base + IITSR);
+	for (u8 i = 0; i < 2; i++)
+		cache->titsr[i] = readl_relaxed(base + TITSR(i));
+
+	return 0;
+}
+
+static void rzg2l_irqc_irq_resume(void)
+{
+	struct rzg2l_irqc_reg_cache *cache = &rzg2l_irqc_data->cache;
+	void __iomem *base = rzg2l_irqc_data->base;
+
+	/*
+	 * Restore only interrupt type. TSSRx will be restored at the
+	 * request of pin controller to avoid spurious interrupts due
+	 * to invalid PIN states.
+	 */
+	for (u8 i = 0; i < 2; i++)
+		writel_relaxed(cache->titsr[i], base + TITSR(i));
+	writel_relaxed(cache->iitsr, base + IITSR);
+}
+
+static struct syscore_ops rzg2l_irqc_syscore_ops = {
+	.suspend	= rzg2l_irqc_irq_suspend,
+	.resume		= rzg2l_irqc_irq_resume,
+};
+
 static const struct irq_chip irqc_chip = {
 	.name			= "rzg2l-irqc",
 	.irq_eoi		= rzg2l_irqc_eoi,
@@ -321,7 +376,6 @@ static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
 	struct irq_domain *irq_domain, *parent_domain;
 	struct platform_device *pdev;
 	struct reset_control *resetn;
-	struct rzg2l_irqc_priv *priv;
 	int ret;
 
 	pdev = of_find_device_by_node(node);
@@ -334,15 +388,15 @@ static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
 		return -ENODEV;
 	}
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
+	rzg2l_irqc_data = devm_kzalloc(&pdev->dev, sizeof(*rzg2l_irqc_data), GFP_KERNEL);
+	if (!rzg2l_irqc_data)
 		return -ENOMEM;
 
-	priv->base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
-	if (IS_ERR(priv->base))
-		return PTR_ERR(priv->base);
+	rzg2l_irqc_data->base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
+	if (IS_ERR(rzg2l_irqc_data->base))
+		return PTR_ERR(rzg2l_irqc_data->base);
 
-	ret = rzg2l_irqc_parse_interrupts(priv, node);
+	ret = rzg2l_irqc_parse_interrupts(rzg2l_irqc_data, node);
 	if (ret) {
 		dev_err(&pdev->dev, "cannot parse interrupts: %d\n", ret);
 		return ret;
@@ -365,17 +419,19 @@ static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
 		goto pm_disable;
 	}
 
-	raw_spin_lock_init(&priv->lock);
+	raw_spin_lock_init(&rzg2l_irqc_data->lock);
 
 	irq_domain = irq_domain_add_hierarchy(parent_domain, 0, IRQC_NUM_IRQ,
 					      node, &rzg2l_irqc_domain_ops,
-					      priv);
+					      rzg2l_irqc_data);
 	if (!irq_domain) {
 		dev_err(&pdev->dev, "failed to add irq domain\n");
 		ret = -ENOMEM;
 		goto pm_put;
 	}
 
+	register_syscore_ops(&rzg2l_irqc_syscore_ops);
+
 	return 0;
 
 pm_put:
diff --git a/drivers/irqchip/irq-xtensa-pic.c b/drivers/irqchip/irq-xtensa-pic.c
index 0c18d1f1e264..f9d6fce4da33 100644
--- a/drivers/irqchip/irq-xtensa-pic.c
+++ b/drivers/irqchip/irq-xtensa-pic.c
@@ -12,6 +12,7 @@
  * Kevin Chea
  */
 
+#include <linux/bits.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
@@ -19,8 +20,6 @@
 #include <linux/irqchip/xtensa-pic.h>
 #include <linux/of.h>
 
-unsigned int cached_irq_mask;
-
 /*
  * Device Tree IRQ specifier translation function which works with one or
  * two cell bindings. First cell value maps directly to the hwirq number.
@@ -44,34 +43,30 @@ static const struct irq_domain_ops xtensa_irq_domain_ops = {
 
 static void xtensa_irq_mask(struct irq_data *d)
 {
-	cached_irq_mask &= ~(1 << d->hwirq);
-	xtensa_set_sr(cached_irq_mask, intenable);
-}
+	u32 irq_mask;
 
-static void xtensa_irq_unmask(struct irq_data *d)
-{
-	cached_irq_mask |= 1 << d->hwirq;
-	xtensa_set_sr(cached_irq_mask, intenable);
+	irq_mask = xtensa_get_sr(intenable);
+	irq_mask &= ~BIT(d->hwirq);
+	xtensa_set_sr(irq_mask, intenable);
 }
 
-static void xtensa_irq_enable(struct irq_data *d)
+static void xtensa_irq_unmask(struct irq_data *d)
 {
-	xtensa_irq_unmask(d);
-}
+	u32 irq_mask;
 
-static void xtensa_irq_disable(struct irq_data *d)
-{
-	xtensa_irq_mask(d);
+	irq_mask = xtensa_get_sr(intenable);
+	irq_mask |= BIT(d->hwirq);
+	xtensa_set_sr(irq_mask, intenable);
 }
 
 static void xtensa_irq_ack(struct irq_data *d)
 {
-	xtensa_set_sr(1 << d->hwirq, intclear);
+	xtensa_set_sr(BIT(d->hwirq), intclear);
 }
 
 static int xtensa_irq_retrigger(struct irq_data *d)
 {
-	unsigned int mask = 1u << d->hwirq;
+	unsigned int mask = BIT(d->hwirq);
 
 	if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
 		return 0;
@@ -81,8 +76,6 @@ static int xtensa_irq_retrigger(struct irq_data *d)
 
 static struct irq_chip xtensa_irq_chip = {
 	.name		= "xtensa",
-	.irq_enable	= xtensa_irq_enable,
-	.irq_disable	= xtensa_irq_disable,
 	.irq_mask	= xtensa_irq_mask,
 	.irq_unmask	= xtensa_irq_unmask,
 	.irq_ack	= xtensa_irq_ack,