irqchip/loongarch-avec: Adjust irqchip driver for 32BIT/64BIT

csr_read64() is only available on 64BIT LoongArch platform, so use the
recently added adaptive csr_read() instead to make the driver work on both
32BIT and 64BIT platforms.

This makes avecintc_enable() a no-op for 32-bit as it is only required on
64-bit systems.

Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260113085940.3344837-2-chenhuacai@loongson.cn

Author: chenhuacai

drivers/irqchip/irq-loongarch-avec.c

@@ -58,11 +58,13 @@ struct avecintc_data {
 
 static inline void avecintc_enable(void)
 {
+#ifdef CONFIG_MACH_LOONGSON64
 	u64 value;
 
 	value = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
 	value |= IOCSR_MISC_FUNC_AVEC_EN;
 	iocsr_write64(value, LOONGARCH_IOCSR_MISC_FUNC);
+#endif
 }
 
 static inline void avecintc_ack_irq(struct irq_data *d)
@@ -167,7 +169,7 @@ void complete_irq_moving(void)
 	struct pending_list *plist = this_cpu_ptr(&pending_list);
 	struct avecintc_data *adata, *tdata;
 	int cpu, vector, bias;
-	uint64_t isr;
+	unsigned long isr;
 
 	guard(raw_spinlock)(&loongarch_avec.lock);
 
@@ -177,16 +179,16 @@ void complete_irq_moving(void)
 		bias = vector / VECTORS_PER_REG;
 		switch (bias) {
 		case 0:
-			isr = csr_read64(LOONGARCH_CSR_ISR0);
+			isr = csr_read(LOONGARCH_CSR_ISR0);
 			break;
 		case 1:
-			isr = csr_read64(LOONGARCH_CSR_ISR1);
+			isr = csr_read(LOONGARCH_CSR_ISR1);
 			break;
 		case 2:
-			isr = csr_read64(LOONGARCH_CSR_ISR2);
+			isr = csr_read(LOONGARCH_CSR_ISR2);
 			break;
 		case 3:
-			isr = csr_read64(LOONGARCH_CSR_ISR3);
+			isr = csr_read(LOONGARCH_CSR_ISR3);
 			break;
 		}
 
@@ -234,7 +236,7 @@ static void avecintc_irq_dispatch(struct irq_desc *desc)
 	chained_irq_enter(chip, desc);
 
 	while (true) {
-		unsigned long vector = csr_read64(LOONGARCH_CSR_IRR);
+		unsigned long vector = csr_read(LOONGARCH_CSR_IRR);
 		if (vector & IRR_INVALID_MASK)
 			break;