dm: x86: Set up interrupt routing from interrupt_init()

At present interrupt routing is set up from arch_misc_init(). We can do it
a little later instead, in interrupt_init().

This removes the manual pirq_init() call. Where the platform does not have
an interrupt router defined in its device tree, no error is generated. Some
platforms do not have this.

Drop pirq_init() since it is no-longer used.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/baytrail/valleyview.c

@@ -50,7 +50,7 @@ int arch_misc_init(void)
 	mrccache_save();
 #endif
 
-	return pirq_init();
+	return 0;
 }
 
 int reserve_arch(void)

arch/x86/cpu/interrupts.c

@@ -12,6 +12,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <asm/cache.h>
 #include <asm/control_regs.h>
 #include <asm/interrupt.h>
@@ -244,6 +245,14 @@ int disable_interrupts(void)
 
 int interrupt_init(void)
 {
+	struct udevice *dev;
+	int ret;
+
+	/* Try to set up the interrupt router, but don't require one */
+	ret = uclass_first_device(UCLASS_IRQ, &dev);
+	if (ret && ret != -ENODEV)
+		return ret;
+
 	/*
 	 * When running as an EFI application we are not in control of
 	 * interrupts and should leave them alone.

arch/x86/cpu/irq.c

@@ -231,13 +231,6 @@ static int create_pirq_routing_table(void)
 	return 0;
 }
 
-int pirq_init(void)
-{
-	struct udevice *dev;
-
-	return uclass_first_device(UCLASS_IRQ, &dev);
-}
-
 int irq_router_probe(struct udevice *dev)
 {
 	int ret;

arch/x86/cpu/qemu/qemu.c

@@ -96,11 +96,6 @@ int arch_early_init_r(void)
 	return 0;
 }
 
-int arch_misc_init(void)
-{
-	return pirq_init();
-}
-
 #ifdef CONFIG_GENERATE_MP_TABLE
 int mp_determine_pci_dstirq(int bus, int dev, int func, int pirq)
 {

arch/x86/cpu/quark/quark.c

@@ -380,7 +380,7 @@ int arch_misc_init(void)
 	mrccache_save();
 #endif
 
-	return pirq_init();
+	return 0;
 }
 
 void board_final_cleanup(void)

arch/x86/cpu/queensbay/tnc.c

@@ -110,5 +110,5 @@ int arch_misc_init(void)
 {
 	unprotect_spi_flash();
 
-	return pirq_init();
+	return 0;
 }

arch/x86/include/asm/irq.h

@@ -65,14 +65,4 @@ struct pirq_routing {
  */
 void cpu_irq_init(void);
 
-/**
- * pirq_init() - Initialize platform PIRQ routing
- *
- * This initializes the PIRQ routing on the platform and configures all PCI
- * devices' interrupt line register to a working IRQ number on the 8259 PIC.
- *
- * @return 0 if OK, -ve on error
- */
-int pirq_init(void);
-
 #endif /* _ARCH_IRQ_H_ */

include/configs/qemu-x86.h

@@ -14,7 +14,6 @@
 #include <configs/x86-common.h>
 
 #define CONFIG_SYS_MONITOR_LEN		(1 << 20)
-#define CONFIG_ARCH_MISC_INIT
 #define CONFIG_ARCH_EARLY_INIT_R
 
 #define CONFIG_PCI_PNP