irqchip/renesas-rzv2h: Add struct rzv2h_hw_info with t_offs variable

The ICU block on the RZ/G3E SoC is almost identical to the one found on
the RZ/V2H SoC, with the following differences:

 - The TINT register base offset is 0x800 instead of zero.
 - The number of GPIO interrupts for TINT selection is 141 instead of 86.
 - The pin index and TINT selection index are not in the 1:1 map
 - The number of TSSR registers is 16 instead of 8
 - Each TSSR register can program 2 TINTs instead of 4 TINTs

Introduce struct rzv2h_hw_info to describe the SoC properties and refactor
the code by moving rzv2h_icu_init() into rzv2h_icu_init_common() and pass
the variable containing hw difference to support both these SoCs.

As a first step add t_offs to the new struct and replace the hardcoded
constants in the code.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/20250224131253.134199-8-biju.das.jz@bp.renesas.com

1 files changed, 34 insertions, 12 deletions

diff --git a/drivers/irqchip/irq-renesas-rzv2h.c b/drivers/irqchip/irq-renesas-rzv2h.c
index 10b9b63a1f09..43b805b6df94 100644
--- a/drivers/irqchip/irq-renesas-rzv2h.c
+++ b/drivers/irqchip/irq-renesas-rzv2h.c
@@ -81,15 +81,25 @@
 #define ICU_PB5_TINT				0x55
 
 /**
+ * struct rzv2h_hw_info - Interrupt Control Unit controller hardware info structure.
+ * @t_offs:		TINT offset
+ */
+struct rzv2h_hw_info {
+	u16		t_offs;
+};
+
+/**
  * struct rzv2h_icu_priv - Interrupt Control Unit controller private data structure.
  * @base:	Controller's base address
  * @fwspec:	IRQ firmware specific data
  * @lock:	Lock to serialize access to hardware registers
+ * @info:	Pointer to struct rzv2h_hw_info
  */
 struct rzv2h_icu_priv {
 	void __iomem			*base;
 	struct irq_fwspec		fwspec[ICU_NUM_IRQ];
 	raw_spinlock_t			lock;
+	const struct rzv2h_hw_info	*info;
 };
 
 static inline struct rzv2h_icu_priv *irq_data_to_priv(struct irq_data *data)
@@ -109,7 +119,7 @@ static void rzv2h_icu_eoi(struct irq_data *d)
 			tintirq_nr = hw_irq - ICU_TINT_START;
 			bit = BIT(tintirq_nr);
 			if (!irqd_is_level_type(d))
-				writel_relaxed(bit, priv->base + ICU_TSCLR);
+				writel_relaxed(bit, priv->base + priv->info->t_offs + ICU_TSCLR);
 		} else if (hw_irq >= ICU_IRQ_START) {
 			tintirq_nr = hw_irq - ICU_IRQ_START;
 			bit = BIT(tintirq_nr);
@@ -137,12 +147,12 @@ static void rzv2h_tint_irq_endisable(struct irq_data *d, bool enable)
 	tssel_n = ICU_TSSR_TSSEL_N(tint_nr);
 
 	guard(raw_spinlock)(&priv->lock);
-	tssr = readl_relaxed(priv->base + ICU_TSSR(k));
+	tssr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TSSR(k));
 	if (enable)
 		tssr |= ICU_TSSR_TIEN(tssel_n);
 	else
 		tssr &= ~ICU_TSSR_TIEN(tssel_n);
-	writel_relaxed(tssr, priv->base + ICU_TSSR(k));
+	writel_relaxed(tssr, priv->base + priv->info->t_offs + ICU_TSSR(k));
 }
 
 static void rzv2h_icu_irq_disable(struct irq_data *d)
@@ -245,8 +255,8 @@ static void rzv2h_clear_tint_int(struct rzv2h_icu_priv *priv, unsigned int hwirq
 	u32 bit = BIT(tint_nr);
 	int k = tint_nr / 16;
 
-	tsctr = readl_relaxed(priv->base + ICU_TSCTR);
-	titsr = readl_relaxed(priv->base + ICU_TITSR(k));
+	tsctr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TSCTR);
+	titsr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TITSR(k));
 	titsel = ICU_TITSR_TITSEL_GET(titsr, titsel_n);
 
 	/*
@@ -255,7 +265,7 @@ static void rzv2h_clear_tint_int(struct rzv2h_icu_priv *priv, unsigned int hwirq
 	 */
 	if ((tsctr & bit) && ((titsel == ICU_TINT_EDGE_RISING) ||
 			      (titsel == ICU_TINT_EDGE_FALLING)))
-		writel_relaxed(bit, priv->base + ICU_TSCLR);
+		writel_relaxed(bit, priv->base + priv->info->t_offs + ICU_TSCLR);
 }
 
 static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
@@ -306,21 +316,21 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 
 	guard(raw_spinlock)(&priv->lock);
 
-	tssr = readl_relaxed(priv->base + ICU_TSSR(tssr_k));
+	tssr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
 	tssr &= ~(ICU_TSSR_TSSEL_MASK(tssel_n) | tien);
 	tssr |= ICU_TSSR_TSSEL_PREP(tint, tssel_n);
 
-	writel_relaxed(tssr, priv->base + ICU_TSSR(tssr_k));
+	writel_relaxed(tssr, priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
 
-	titsr = readl_relaxed(priv->base + ICU_TITSR(titsr_k));
+	titsr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TITSR(titsr_k));
 	titsr &= ~ICU_TITSR_TITSEL_MASK(titsel_n);
 	titsr |= ICU_TITSR_TITSEL_PREP(sense, titsel_n);
 
-	writel_relaxed(titsr, priv->base + ICU_TITSR(titsr_k));
+	writel_relaxed(titsr, priv->base + priv->info->t_offs + ICU_TITSR(titsr_k));
 
 	rzv2h_clear_tint_int(priv, hwirq);
 
-	writel_relaxed(tssr | tien, priv->base + ICU_TSSR(tssr_k));
+	writel_relaxed(tssr | tien, priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
 
 	return 0;
 }
@@ -424,7 +434,8 @@ static void rzv2h_icu_put_device(void *data)
 	put_device(data);
 }
 
-static int rzv2h_icu_init(struct device_node *node, struct device_node *parent)
+static int rzv2h_icu_init_common(struct device_node *node, struct device_node *parent,
+				 const struct rzv2h_hw_info *hw_info)
 {
 	struct irq_domain *irq_domain, *parent_domain;
 	struct rzv2h_icu_priv *rzv2h_icu_data;
@@ -490,6 +501,8 @@ static int rzv2h_icu_init(struct device_node *node, struct device_node *parent)
 		goto pm_put;
 	}
 
+	rzv2h_icu_data->info = hw_info;
+
 	/*
 	 * coccicheck complains about a missing put_device call before returning, but it's a false
 	 * positive. We still need &pdev->dev after successfully returning from this function.
@@ -502,6 +515,15 @@ pm_put:
 	return ret;
 }
 
+static const struct rzv2h_hw_info rzv2h_hw_params = {
+	.t_offs		= 0,
+};
+
+static int rzv2h_icu_init(struct device_node *node, struct device_node *parent)
+{
+	return rzv2h_icu_init_common(node, parent, &rzv2h_hw_params);
+}
+
 IRQCHIP_PLATFORM_DRIVER_BEGIN(rzv2h_icu)
 IRQCHIP_MATCH("renesas,r9a09g057-icu", rzv2h_icu_init)
 IRQCHIP_PLATFORM_DRIVER_END(rzv2h_icu)