ARM: use ARM_DMA_ZONE_SIZE to adjust the zone sizes

Rather than each platform providing its own function to adjust the
zone sizes, use the new ARM_DMA_ZONE_SIZE definition to perform this
adjustment.  This ensures that the actual DMA zone size and the
ISA_DMA_THRESHOLD/MAX_DMA_ADDRESS definitions are consistent with
each other, and moves this complexity out of the platform code.

Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 1 insertions, 33 deletions

diff --git a/arch/arm/mach-pxa/cm-x2xx-pci.c b/arch/arm/mach-pxa/cm-x2xx-pci.c
index 8b1a30959fae..1afc0fb7d6d5 100644
--- a/arch/arm/mach-pxa/cm-x2xx-pci.c
+++ b/arch/arm/mach-pxa/cm-x2xx-pci.c
@@ -29,33 +29,6 @@
 unsigned long it8152_base_address;
 static int cmx2xx_it8152_irq_gpio;
 
-/*
- * Only first 64MB of memory can be accessed via PCI.
- * We use GFP_DMA to allocate safe buffers to do map/unmap.
- * This is really ugly and we need a better way of specifying
- * DMA-capable regions of memory.
- */
-void __init cmx2xx_pci_adjust_zones(unsigned long *zone_size,
-        unsigned long *zhole_size)
-{
-        unsigned int sz = SZ_64M >> PAGE_SHIFT;
-
-        if (machine_is_armcore()) {
-                pr_info("Adjusting zones for CM-X2XX\n");
-
-                /*
-                 * Only adjust if > 64M on current system
-                 */
-                if (zone_size[0] <= sz)
-                        return;
-
-                zone_size[1] = zone_size[0] - sz;
-                zone_size[0] = sz;
-                zhole_size[1] = zhole_size[0];
-                zhole_size[0] = 0;
-        }
-}
-
 static void cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
 {
         /* clear our parent irq */
diff --git a/arch/arm/mach-pxa/include/mach/memory.h b/arch/arm/mach-pxa/include/mach/memory.h
index 57a0b689b4d0..07734f37f8fd 100644
--- a/arch/arm/mach-pxa/include/mach/memory.h
+++ b/arch/arm/mach-pxa/include/mach/memory.h
@@ -17,12 +17,7 @@
  */
 #define PLAT_PHYS_OFFSET        UL(0xa0000000)
 
-#if !defined(__ASSEMBLY__) && defined(CONFIG_MACH_ARMCORE) && defined(CONFIG_PCI)
-void cmx2xx_pci_adjust_zones(unsigned long *size, unsigned long *holes);
-
-#define arch_adjust_zones(size, holes) \
-        cmx2xx_pci_adjust_zones(size, holes)
-
+#if defined(CONFIG_MACH_ARMCORE) && defined(CONFIG_PCI)
 #define ARM_DMA_ZONE_SIZE       SZ_64M
 #endif