PCI: ixp4xx: Guard ARM32-specific hook_fault_code()

hook_fault_code() is an ARM32-specific API. Guard it and related code with
CONFIG_ARM #ifdefs and remove the ARM arch dependency from Kconfig so the
driver can be compile tested on other architectures.

Signed-off-by: Bjorn Helgaas <[e-mail]>
[mani: dropped the ARM arch Kconfig dependency]
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/pci/controller/Kconfig

···
 
 config PCI_IXP4XX
 	bool "Intel IXP4xx PCI controller"
-	depends on ARM && OF
+	depends on OF
 	depends on ARCH_IXP4XX || COMPILE_TEST
 	default ARCH_IXP4XX
 	help

drivers/pci/controller/pci-ixp4xx.c

···
 	return 0xffffffff;
 }
 
+#ifdef CONFIG_ARM
 static int ixp4xx_crp_read_config(struct ixp4xx_pci *p, int where, int size,
 				  u32 *value)
 {
···
 
 	return PCIBIOS_SUCCESSFUL;
 }
+#endif
 
 static int ixp4xx_crp_write_config(struct ixp4xx_pci *p, int where, int size,
 				   u32 value)
···
 	return 0;
 }
 
+#ifdef CONFIG_ARM
 /* Only used to get context for abort handling */
 static struct ixp4xx_pci *ixp4xx_pci_abort_singleton;
 
···
 
 	return 0;
 }
+#endif
 
 static int __init ixp4xx_pci_probe(struct platform_device *pdev)
 {
···
 	dev_info(dev, "controller is in %s mode\n",
 		 p->host_mode ? "host" : "option");
 
+#ifdef CONFIG_ARM
 	/* Hook in our fault handler for PCI errors */
 	ixp4xx_pci_abort_singleton = p;
 	hook_fault_code(16+6, ixp4xx_pci_abort_handler, SIGBUS, 0,
 			"imprecise external abort");
+#endif
 
 	ret = ixp4xx_pci_parse_map_ranges(p);
 	if (ret)