MIPS: ath79: fix a wrong IRQ number

The Ubiquiti XM board setup code uses an invalid
IRQ number, because it if above of NR_IRQS. This
leads to failed 'request_irq' calls:

  ath9k 0000:00:00.0: request_irq failed
  ath9k: probe of 0000:00:00.0 failed with error -22

Preserve some IRQ numbers for the built-in IRQ
controller of PCI host controllers in the
AR71XX/AR724X SoCs, and use the correct IRQ
number in the board setup code.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3495/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath79/mach-ubnt-xm.c

@@ -17,6 +17,8 @@
 #include <linux/ath9k_platform.h>
 #endif /* CONFIG_PCI */
 
+#include <asm/mach-ath79/irq.h>
+
 #include "machtypes.h"
 #include "dev-gpio-buttons.h"
 #include "dev-leds-gpio.h"
@@ -33,7 +35,6 @@
 #define UBNT_XM_KEYS_POLL_INTERVAL	20
 #define UBNT_XM_KEYS_DEBOUNCE_INTERVAL	(3 * UBNT_XM_KEYS_POLL_INTERVAL)
 
-#define UBNT_XM_PCI_IRQ			48
 #define UBNT_XM_EEPROM_ADDR		(u8 *) KSEG1ADDR(0x1fff1000)
 
 static struct gpio_led ubnt_xm_leds_gpio[] __initdata = {
@@ -86,7 +87,7 @@ static struct ath9k_platform_data ubnt_xm_eeprom_data;
 
 static struct ar724x_pci_data ubnt_xm_pci_data[] = {
 	{
-		.irq	= UBNT_XM_PCI_IRQ,
+		.irq	= ATH79_PCI_IRQ(0),
 		.pdata	= &ubnt_xm_eeprom_data,
 	},
 };

arch/mips/include/asm/mach-ath79/irq.h

@@ -10,11 +10,15 @@
 #define __ASM_MACH_ATH79_IRQ_H
 
 #define MIPS_CPU_IRQ_BASE	0
-#define NR_IRQS			40
+#define NR_IRQS			46
 
 #define ATH79_MISC_IRQ_BASE	8
 #define ATH79_MISC_IRQ_COUNT	32
 
+#define ATH79_PCI_IRQ_BASE	(ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT)
+#define ATH79_PCI_IRQ_COUNT	6
+#define ATH79_PCI_IRQ(_x)	(ATH79_PCI_IRQ_BASE + (_x))
+
 #define ATH79_CPU_IRQ_IP2	(MIPS_CPU_IRQ_BASE + 2)
 #define ATH79_CPU_IRQ_USB	(MIPS_CPU_IRQ_BASE + 3)
 #define ATH79_CPU_IRQ_GE0	(MIPS_CPU_IRQ_BASE + 4)