[MIPS] Remove obsolete isa_slot_offset

 The isa_slot_offset variable and its __ISA_IO_base macro is not used
anywhere anymore.  It does not look like a decent interface per today's
standards either.  Remove both including all places of initialization.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/jazz/setup.c

@@ -79,7 +79,6 @@ void __init plat_mem_setup(void)
 	if (mips_machtype == MACH_MIPS_MAGNUM_4000)
 		EISA_bus = 1;
 #endif
-	isa_slot_offset = 0xe3000000;
 
 	/* request I/O space for devices used on all i[345]86 PCs */
 	for (i = 0; i < ARRAY_SIZE(jazz_io_resources); i++)

arch/mips/kernel/setup.c

@@ -68,13 +68,6 @@ static char command_line[CL_SIZE];
 const unsigned long mips_io_port_base __read_mostly = -1;
 EXPORT_SYMBOL(mips_io_port_base);
 
-/*
- * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
- * for the processor.
- */
-unsigned long isa_slot_offset;
-EXPORT_SYMBOL(isa_slot_offset);
-
 static struct resource code_resource = { .name = "Kernel code", };
 static struct resource data_resource = { .name = "Kernel data", };
 

arch/mips/pci/pci-bcm1480.c

@@ -254,8 +254,6 @@ static int __init bcm1480_pcibios_init(void)
 		ioremap(A_BCM1480_PHYS_PCI_IO_MATCH_BYTES, 65536);
 	bcm1480_controller.io_map_base -= bcm1480_controller.io_offset;
 	set_io_port_base(bcm1480_controller.io_map_base);
-	isa_slot_offset = (unsigned long)
-		ioremap(A_BCM1480_PHYS_PCI_MEM_MATCH_BYTES, 1024*1024);
 
 	register_pci_controller(&bcm1480_controller);
 

arch/mips/pci/pci-sb1250.c

@@ -254,9 +254,6 @@ static int __init sb1250_pcibios_init(void)
 	 * works correctly with most of Linux's drivers.
 	 * XXX ehs: Should this happen in PCI Device mode?
 	 */
-	isa_slot_offset = (unsigned long)
-	    ioremap(A_PHYS_LDTPCI_IO_MATCH_BYTES_32, 1024 * 1024);
-
 	io_map_base = ioremap(A_PHYS_LDTPCI_IO_MATCH_BYTES, 1024 * 1024);
 	sb1250_controller.io_map_base = io_map_base;
 	set_io_port_base((unsigned long)io_map_base);

arch/mips/sni/setup.c

@@ -116,7 +116,6 @@ void __init plat_mem_setup(void)
 	/*
 	 * Setup (E)ISA I/O memory access stuff
 	 */
-	isa_slot_offset = CKSEG1ADDR(0xb0000000);
 #ifdef CONFIG_EISA
 	EISA_bus = 1;
 #endif

include/asm-mips/io.h

@@ -160,13 +160,6 @@ static inline void * isa_bus_to_virt(unsigned long address)
 #define virt_to_bus virt_to_phys
 #define bus_to_virt phys_to_virt
 
-/*
- * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
- * for the processor.  This implies the assumption that there is only
- * one of these busses.
- */
-extern unsigned long isa_slot_offset;
-
 /*
  * Change "struct page" to physical address.
  */
@@ -527,16 +520,6 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int
 	memcpy((void __force *) dst, src, count);
 }
 
-/*
- * ISA space is 'always mapped' on currently supported MIPS systems, no need
- * to explicitly ioremap() it. The fact that the ISA IO space is mapped
- * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
- * are physical addresses. The following constant pointer can be
- * used as the IO-area pointer (it can be iounmapped as well, so the
- * analogy with PCI is quite large):
- */
-#define __ISA_IO_base ((char *)(isa_slot_offset))
-
 /*
  * The caches on some architectures aren't dma-coherent and have need to
  * handle this in software.  There are three types of operations that