[ARM] Refine selection of ISA_DMA_API and generic dma.c code

ISA_DMA_API tells the rest of the kernel if the ISA DMA API is
available.  Select this symbol only on machine types which make
use of the ISA DMA API.

Make building of arch/arm/kernel/dma.c depend on this symbol -
if a machine does not support the ISA DMA API, it's pointless
building this file.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4b15f5f1e254d24ae1234c6de3697b5f85efa5ba..cb413109da0c9e81b98497d339ac923286fc8ef4 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -154,6 +154,7 @@ config ARCH_RPC
        select FIQ
        select TIMER_ACORN
        select ARCH_MAY_HAVE_PC_FDC
+       select ISA_DMA_API
        help
          On the Acorn Risc-PC, Linux can support the internal IDE disk and
          CD-ROM interface, serial and parallel port, and the floppy drive.
@@ -206,6 +207,7 @@ config ARCH_IMX
 
 config ARCH_H720X
        bool "Hynix-HMS720x-based"
+       select ISA_DMA_API
        help
          This enables support for systems based on the Hynix HMS720x
 
@@ -290,12 +292,14 @@ config ISA
          (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
          newer boards don't support it.  If you have ISA, say Y, otherwise N.
 
+# Select ISA DMA controller support
 config ISA_DMA
        bool
+       select ISA_DMA_API
 
+# Select ISA DMA interface
 config ISA_DMA_API
        bool
-       default y
 
 config PCI
        bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 25b14c3fdc4a0c2253f9b3de43024d3d35c2c84e..de94b0f3ee2a658c8ced0c87d9460ca4f2e0f1ac 100644 (file)
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -6,11 +6,12 @@ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
 
 # Object file lists.
 
-obj-y          := compat.o dma.o entry-armv.o entry-common.o irq.o \
+obj-y          := compat.o entry-armv.o entry-common.o irq.o \
                   process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
                   time.o traps.o
 
 obj-$(CONFIG_APM)              += apm.o
+obj-$(CONFIG_ISA_DMA_API)      += dma.o
 obj-$(CONFIG_ARCH_ACORN)       += ecard.o 
 obj-$(CONFIG_FOOTBRIDGE)       += isa.o
 obj-$(CONFIG_FIQ)              += fiq.o