[MIPS] Remove duplicate ISA DMA code for 0 DMA channel case.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -266,8 +266,8 @@ config MIPS_MALTA
 	select BOOT_ELF32
 	select HAVE_STD_PC_SERIAL_PORT
 	select DMA_NONCOHERENT
-	select IRQ_CPU
 	select GENERIC_ISA_DMA
+	select IRQ_CPU
 	select HW_HAS_PCI
 	select I8259
 	select MIPS_BOARDS_GEN
@@ -534,7 +534,7 @@ config SGI_IP22
 	select HW_HAS_EISA
 	select IP22_CPU_SCACHE
 	select IRQ_CPU
-	select NO_ISA if ISA
+	select GENERIC_ISA_DMA_SUPPORT_BROKEN
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_R4X00
 	select SYS_HAS_CPU_R5000
@@ -881,6 +881,9 @@ config MIPS_NILE4
 config MIPS_DISABLE_OBSOLETE_IDE
 	bool
 
+config GENERIC_ISA_DMA_SUPPORT_BROKEN
+	bool
+
 #
 # Endianess selection.  Suffiently obscure so many users don't know what to
 # answer,so we try hard to limit the available choices.  Also the use of a
@@ -1852,13 +1855,11 @@ source "drivers/pci/Kconfig"
 config ISA
 	bool
 
-config NO_ISA
-	bool
-
 config EISA
 	bool "EISA support"
 	depends on HW_HAS_EISA
 	select ISA
+	select GENERIC_ISA_DMA
 	---help---
 	  The Extended Industry Standard Architecture (EISA) bus was
 	  developed as an open alternative to the IBM MicroChannel bus.

arch/mips/kernel/Makefile

@@ -45,7 +45,6 @@ obj-$(CONFIG_MIPS_APSP_KSPD)	+= kspd.o
 obj-$(CONFIG_MIPS_VPE_LOADER)	+= vpe.o
 obj-$(CONFIG_MIPS_VPE_APSP_API)	+= rtlx.o
 
-obj-$(CONFIG_NO_ISA)		+= dma-no-isa.o
 obj-$(CONFIG_I8259)		+= i8259.o
 obj-$(CONFIG_IRQ_CPU)		+= irq_cpu.o
 obj-$(CONFIG_IRQ_CPU_RM7K)	+= irq-rm7000.o

arch/mips/kernel/dma-no-isa.c

-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2004 by Ralf Baechle
- *
- * Dummy ISA DMA functions for systems that don't have ISA but share drivers
- * with ISA such as legacy free PCI.
- */
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-
-DEFINE_SPINLOCK(dma_spin_lock);
-
-int request_dma(unsigned int dmanr, const char * device_id)
-{
-	return -EINVAL;
-}
-
-void free_dma(unsigned int dmanr)
-{
-}
-
-EXPORT_SYMBOL(dma_spin_lock);
-EXPORT_SYMBOL(request_dma);
-EXPORT_SYMBOL(free_dma);

include/asm-mips/dma.h

@@ -74,7 +74,9 @@
  *
  */
 
+#ifndef GENERIC_ISA_DMA_SUPPORT_BROKEN
 #define MAX_DMA_CHANNELS	8
+#endif
 
 /*
  * The maximum address in KSEG0 that we can perform a DMA transfer to on this