LoongArch: Add and use some macros for AVEC

Add and use some macros for AVEC interrupt controller, instead of using
magic numbers.

Signed-off-by: Song Gao <[e-mail]>
Signed-off-by: Huacai Chen <[e-mail]>

arch/loongarch/include/asm/irq.h

···
 #define NR_LEGACY_VECTORS	16
 #define IRQ_MATRIX_BITS		NR_VECTORS
 
+#define AVEC_IRQ_SHIFT		4
+#define AVEC_IRQ_BIT		8
+#define AVEC_IRQ_MASK		GENMASK(AVEC_IRQ_BIT - 1, 0)
+#define AVEC_CPU_SHIFT		12
+#define AVEC_CPU_BIT		16
+#define AVEC_CPU_MASK		GENMASK(AVEC_CPU_BIT - 1, 0)
+
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
 

drivers/irqchip/irq-loongarch-avec.c

···
 	struct avecintc_data *adata = irq_data_get_irq_chip_data(d);
 
 	msg->address_hi = 0x0;
-	msg->address_lo = (loongarch_avec.msi_base_addr | (adata->vec & 0xff) << 4)
-			  | ((cpu_logical_map(adata->cpu & 0xffff)) << 12);
+	msg->address_lo = (loongarch_avec.msi_base_addr |
+			  (adata->vec & AVEC_IRQ_MASK) << AVEC_IRQ_SHIFT) |
+			  ((cpu_logical_map(adata->cpu & AVEC_CPU_MASK)) << AVEC_CPU_SHIFT);
 	msg->data = 0x0;
 }