[ARM] 4348/4: iop3xx: Give Linux control over PCI initialization

Currently the iop3xx platform support code assumes that RedBoot is the
bootloader and has already initialized the ATU.  Linux should handle this
initialization for three reasons:

1/ The memory map that RedBoot sets up is not optimal (page_to_dma and
virt_to_phys return different addresses).  The effect of this is that using
the dma mapping API for the internal bus dma units generates pci bus
addresses that are incorrect for the internal bus.

2/ Not all iop platforms use RedBoot

3/ If the ATU is already initialized it indicates that the iop is an add-in
card in another host, it does not own the PCI bus, and should not be
re-initialized.

Changelog:
* rather than change nr_controllers to zero, simply do not call
  pci_common_init

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 12 insertions, 2 deletions

diff --git a/include/asm-arm/arch-iop33x/iop33x.h b/include/asm-arm/arch-iop33x/iop33x.h
index 7ac6e93db5ff..766985b9a723 100644
--- a/include/asm-arm/arch-iop33x/iop33x.h
+++ b/include/asm-arm/arch-iop33x/iop33x.h
@@ -29,5 +29,15 @@
 #define IOP33X_UART1_PHYS       (IOP3XX_PERIPHERAL_PHYS_BASE + 0x1740)
 #define IOP33X_UART1_VIRT       (IOP3XX_PERIPHERAL_VIRT_BASE + 0x1740)
 
+/* ATU Parameters
+ * set up a 1:1 bus to physical ram relationship
+ * w/ pci on top of physical ram in memory map
+ */
+#define IOP33X_MAX_RAM_SIZE             0x80000000UL
+#define IOP3XX_MAX_RAM_SIZE             IOP33X_MAX_RAM_SIZE
+#define IOP3XX_PCI_LOWER_MEM_BA (PHYS_OFFSET + IOP33X_MAX_RAM_SIZE)
+#define IOP33X_PCI_MEM_WINDOW_SIZE      0x08000000
+#define IOP3XX_PCI_MEM_WINDOW_SIZE      IOP33X_PCI_MEM_WINDOW_SIZE
+
 
 #endif
diff --git a/include/asm-arm/arch-iop33x/memory.h b/include/asm-arm/arch-iop33x/memory.h
index 0d39139b241e..c8749127d6ab 100644
--- a/include/asm-arm/arch-iop33x/memory.h
+++ b/include/asm-arm/arch-iop33x/memory.h
@@ -19,8 +19,8 @@
  * bus_to_virt: Used to convert an address for DMA operations
  *              to an address that the kernel can use.
  */
-#define __virt_to_bus(x)        (((__virt_to_phys(x)) & ~(*IOP3XX_IATVR2)) | ((*IOP3XX_IABAR2) & 0xfffffff0))
-#define __bus_to_virt(x)        (__phys_to_virt(((x) & ~(*IOP3XX_IALR2)) | ( *IOP3XX_IATVR2)))
+#define __virt_to_bus(x)        (__virt_to_phys(x))
+#define __bus_to_virt(x)        (__phys_to_virt(x))
 
 
 #endif